US20010042947A1 - Method for manufacturing a hollow plastic product - Google Patents
Method for manufacturing a hollow plastic product Download PDFInfo
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- US20010042947A1 US20010042947A1 US08/703,249 US70324996D US2001042947A1 US 20010042947 A1 US20010042947 A1 US 20010042947A1 US 70324996 D US70324996 D US 70324996D US 2001042947 A1 US2001042947 A1 US 2001042947A1
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- Prior art keywords
- parison
- supplying
- mold half
- passage
- plastic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/131—Curved articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/19—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their edges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/255—Flow control means, e.g. valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/269—Extrusion in non-steady condition, e.g. start-up or shut-down
- B29C48/2692—Material change
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
- B29C48/337—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location
- B29C48/338—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location using a die with concentric parts, e.g. rings, cylinders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/22—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using multilayered preforms or parisons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/4242—Means for deforming the parison prior to the blowing operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92514—Pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/926—Flow or feed rate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92885—Screw or gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92904—Die; Nozzle zone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3006—Preforms or parisons made of several components having tangentially different components within one layer, e.g. longitudinal stripes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
- B29C48/337—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/25—Solid
- B29K2105/253—Preform
- B29K2105/258—Tubular
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/24—Pipe joints or couplings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
- B29L2031/716—Bottles of the wide mouth type, i.e. the diameters of the bottle opening and its body are substantially identical
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/131—Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
- Y10T428/1317—Multilayer [continuous layer]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/139—Open-ended, self-supporting conduit, cylinder, or tube-type article
- Y10T428/1393—Multilayer [continuous layer]
Definitions
- This invention relates to manufacturing of a hollow plastic product and in particular to a method and apparatus for manufacturing a hollow plastic product having an irregular structure, such as a projection which projects outwardly from the outer surface of the product or change in composition. More specifically, the present invention relates to a blow molding technique for fabricating a hollow plastic product having a desired shape which cannot be manufactured by the conventional blow molding technology.
- the main body 2 ′ is first fabricated by blow molding and then the projection, which has been previously fabricated by any appropriate method, such as injection molding, is fixedly attached to the main body 2 ′.
- any appropriate method such as injection molding
- the projection 1 may be manufactured together with the main body 2 ′ at the same time by blow molding; in this case, however, a significantly large flash is necessarily formed, and, thus it is expensive and time consuming to remove such a large flash, not to mention the production of significant waste of material.
- a hollow plastic product differs in composition depending on the location thereby providing different properties.
- a hollow plastic tube is often desired to have a relatively hard section to be fixedly attached to a metal fitting or the like and another section which is relatively soft for providing an easy bending characteristic.
- a typical prior art approach would be to first form different sections separately and then put them together to form a final product and such an approach is disadvantageous because such a multistep process would be time consuming and expensive and the integrity of the final product is relatively poor.
- Another object of the present invention is to provide an improved method and apparatus for manufacturing a hollow plastic product having a projection which projects outwardly from the outer surface of the product.
- a further object of the present invention is to provide an improved blow molding method and apparatus for manufacturing a hollow plastic product having any desired shape and structure.
- a still further object of the present invention is to provide an improved blow molding method and apparatus capable of manufacturing a hollow plastic product having locally different compositions and properties.
- a still further object of the present invention is to provide an improved blow molding method and apparatus capable of manufacturing a hollow plastic product having a complicated structure in a reduced number of steps.
- FIG. 1 is a perspective view showing a hollow plastic product having an outwardly extending projection which may be manufactured advantageously in accordance with the present invention
- FIG. 2 is a front view showing the overall structure of apparatus for manufacturing a hollow plastic product constructed in accordance with one embodiment of the present invention
- FIG. 3 is a schematic illustration showing a modified apparatus including a separate supply line for supplying additional molding material
- FIG. 4 is a plan view showing a mold half having a groove provided with an outwardly extending projection 10 a;
- FIG. 5 is a schematic illustration showing the condition in which the upper and lower mold halves are about to be brought into contact with a parison 13 and a clump of molding material in place;
- FIG. 6 is a cross-sectional view showing a plastic container having a three layer structure, which may be advantageously manufactured according to the method of present invention
- FIG. 7 is a schematic illustration showing a novel blow molding apparatus constructed in accordance with another embodiment of the present invention.
- FIGS. 8 a through 8 c are schematic illustrations in cross-section showing several typical hollow plastic products which may be advantageously manufactured by the apparatus shown in FIG. 7;
- FIG. 9 is a schematic illustration showing a modified blow molding apparatus constructed in accordance with a further embodiment of the present invention.
- FIG. 10 is a schematic illustration showing in cross-section a parison p′ having a local two-layer structure suitable for forming a plastic product having two layers different in material;
- FIG. 11 is a schematic illustration showing a further modified blow molding apparatus constructed in accordance with a still further embodiment of the present invention.
- FIG. 12 is a schematic illustration showing a still further modified blow molding apparatus for forming a three-layer plastic product constructed in accordance with a still further embodiment of the present invention.
- a process for manufacturing a hollow plastic product including at least one tubular section and at least one projecting section projecting outwardly from said tubular section, comprising the steps of: preparing a first mold half engraved with a first groove defining a part of mold cavity corresponding in shape to a hollow plastic product to be molded, said first groove including at least one tubular portion and at least one projecting portion which correspond to the tubular and projecting sections of the product, respectively; supplying a clump of first molten molding material to said at least one projecting portion; supplying a parison of second molten molding material to said at least one tubular portion; bringing a second mold half engraved with a second groove defining the remaining part of the mold cavity into contact with the first mold half; and blowing a pressurized gas into the parison while maintaining the first and second mold halves clamped together.
- the first and second molten molding materials are identical.
- FIG. 2 there is shown a blow molding apparatus constructed in accordance with one embodiment of the present invention, in which a hopper 3 stores a quantity of molding material, such as any well-known plastic material suitable for use in blow molding, and a dispensing tube 4 is provided at the bottom of the hopper 3 extending horizontally and in communication with the hopper 3 .
- a dispensing tube 4 At the forward end of the dispensing tube 4 is provided an extrusion nozzle 5 and an auger screw 6 is rotatably housed in the dispensing tube 4 .
- a heat band 7 is wrapped around the outer peripheral surface of the tube 4 thereby allowing the molding material in transportation through the tube 4 to be molten in state and thus easily flowable.
- the molding material in the hopper 3 is fed into the dispensing tube 7 and the molding material thus fed becomes molten in state due to the heat applied from the heater band 7 and transported toward its forward end, or the extrusion nozzle 5 .
- the molten molding material thus transported is extruded from the nozzle 5 in the form of a parison which is then supplied into a first groove (shown by the dotted line in FIG. 2) engraved in a first mold half 9 , which, in turn, is fixedly mounted on a turntable.
- a second mold half 14 engraved with a second groove, which defines a mold cavity corresponding in outer shape to a plastic product to be molded when the first and second mold halves are brought into mating contact.
- the second mold half 14 is supported to be vertically movable and thus the second mold half 14 may be brought into contact with the first mold half 9 set in position therebelow.
- the first and second mold haves 9 and 14 in mating contact are clamped and a pressurized gas may be introduced into the parison placed between the clamped mold halves to carry out blow molding. Thereafter, when the parison sufficiently cools down to a point that it can maintain its molded shape, the second mold half 14 is moved upward as separated away from the first mold half 9 fixedly attached to the turntable.
- the apparatus illustrated in FIG. 2 is advantageous because two or more first mold halves 9 may be provided on the turntable to carry out different steps in parallel.
- FIG. 2 is advantageously modified as shown in FIG. 3 for manufacturing a hollow plastic product having a projection shown in FIG. 1. That is, in the structure shown in FIG. 3, there is provided a bypass pipe 4 a extending from and in communication with the dispensing pipe 4 .
- the bypass pipe 4 a is provided with a control valve 4 b which controls the opening and closing of the bypass pipe 4 a .
- FIG. 4 illustrates in plan view of the first mold half 9 having a groove engraved therein, which defines a mold cavity when it is brought into mating contact with the second mold half 14 .
- the mold half illustrated in FIG. 4 is to be used for manufacturing the hollow plastic product shown in FIG.
- the groove engraved in the first mold half 9 includes a generally S-shaped half-tube portion and a projecting portion 10 a , which corresponds to the projection 1 in shape.
- the S-shaped portion of the groove engraved in the first mold half 9 is supplied with a parison 13 extruded out of the extrusion nozzle 5 including an outer cylinder 11 and a mandrel 12 which extends through the outer cylinder 11 with a gap therebetween, with the gap being in fluidic communication with the dispensing pipe 4 .
- the parison 13 is formed as the molten molding material is extruded out of the nozzle 5 as supplied from the dispensing pipe 4 through the gap defined between the outer cylinder 11 and the mandrel 12 .
- the molten molding material in the dispensing pipe 4 is also supplied to the projection portion 10 a of the first molding half 9 through the bypass pipe 4 a by operating the valve 4 b .
- the molten molding material supplied through the bypass pipe 4 a is in the form of a clump and such a clump is preferably is slightly larger in volume than the projection cavity defined by the projecting portion 10 a when the two mold halves are brought into contact. It is to be noted, however, that in the case where the molding material stored in the hopper 3 is sufficiently molten in state, it may be partly taken out of the hopper 3 by hand or any appropriate tool and supplied to the projecting portion 10 a in the first mold half 9 .
- the clump 8 becomes well integrated with the parison 13 thereby forming a plastic product of unitary structure.
- the clump 8 be supplied slightly larger in volume than the projection cavity defined by the projecting portions 10 a , 10 a when the two mold halves 9 and 14 are brought into contact.
- the clump 8 is same in material as the parison 13 .
- the clump 8 may differ in material from the parison 13 , but it is important that the material of clump 8 be conformable with the material of parison 13 when different materials are used. Thus, it is most preferable that the clump 8 and parison 13 are same in material.
- the mold halves 9 and 14 are maintained clamped together for a predetermined time period until the molded parison and clump become sufficiently ccoled to obtain a self-shape holding ability. Thereafter, the mold halves 9 and 14 are separated from each other to remove the resulting plastic product thus molded.
- the formation of a flash may be minimized even if a desired plastic product to be molded has a projection which extends significantly outwardly from the outer peripheral surface of the product.
- Minimization of flash formation indicates minimization in secondary processing for flash removal and in waste of material.
- the clump 8 becomes integrated with the parison 13 after blow molding, there is obtained a plastic product of unitary structure even if the plastic product has an irregularly shaped portion such as a projection so that the product is high in integrity and in durability.
- the product manufactured according to the present invention may be advantageously used as a duct which is subjected to severe vibration, e.g., duct of automobile air conditioner.
- FIG. 6 shows another plastic product c having a multilayer structure which can be advantageously manufactured by blow molding in accordance with another aspect of the present invention.
- the product c is a bottle-shaped container and it has a three layer structure excepting its mouth section 22 . That is, the body 21 of container c includes relatively rigid outer and inner layers 21 a and 21 c and a foam material layer 21 b which is sandwiched between the outer and inner layers 21 a and 21 c and which is excellent in heat shielding characteristic though its rigidity is rather poor.
- the mouth section 22 is formed as a single layer from a relatively rigid material because threads are formed at the outer peripheral surface thereof.
- the body and mouth sections 21 and 22 are first formed separately and then these sections are put together adhesively or any other method.
- a prior art approach is disadvantageous because the resulting structure is relatively poor in durability due to the poor integrity between the body and mouth sections 21 and 22 .
- a prior art approach is also disadvantageous from a manufacturing viewpoint since it requires a step of combining the body and mouth sections 21 and 22 .
- FIG. 7 illustrates in schematic an apparatus for manufacturing a hollow plastic product having regions of different compositions and this structure may be advantageously implemented in the apparatus shown in FIG. 2.
- the apparatus shown in FIG. 7 may be used to manufacture various types of hollow plastic products having regions of different compositions.
- FIGS. 8 a through 8 c Some of the examples which may be manufactured using the apparatus shown in FIG. 7 are shown in FIGS. 8 a through 8 c .
- a hollow plastic product P shown in FIG. 8 a includes a bellow section P 2 and a pair of straight pipe sections P 10 and P 11 , each at each end of the bellow section P 2 .
- the bellow section P 2 is comprised of a relatively soft material, such as low-density polyethylene (LD-PE), and the straight pipe sections P 10 and P 11 are comprised of a relatively rigid material, such as high-density polyethylene (HD-PE), so that the pipe P has an increased stretchability.
- FIG. 8 b shows another hollow plastic product J having a pipe section J 1 comprised of a relatively rigid material and a pair of connecting sections J 2 and J 2 , each comprised of a relatively soft material. With such a pipe J, the connecting section J 2 may be easily fitted onto an object to be connected.
- FIG. 8 c shows an elbow V which includes a curved pipe section V 2 comprised of a relatively soft material and a pair of connecting sections V 1 and V 1 , each comprised of a relatively hard material.
- a curved pipe section V 2 comprised of a relatively soft material
- a pair of connecting sections V 1 and V 1 each comprised of a relatively hard material.
- it includes different regions comprised of different materials having different characteristics. And, these products are preferably manufactured by the apparatus shown in FIG. 7.
- a pair of dispensing pipes 23 and 24 are provided as connected to the extrusion nozzle 26 as extending from respective hoppers (not shown).
- the pair of dispensing pipes 23 and 24 define dispensing passages 23 a and 24 a , respectively, each of which is provided with an auger screw 25 .
- each of the dispensing pipes 23 and 24 is constructed similarly with the dispensing pipe in the previous embodiment, so that as the screws 25 , 25 are driven to rotate, the molten molding material, typically a thermoplastic material, is supplied to the nozzle from each of the hoppers.
- the nozzle 26 is provided with a mandrel 26 a having a convergent bottom end as extending vertically and located at the center of the nozzle 26 .
- the mandrel 26 a is provided with a center hole 26 a 1 which extends through the mandrel 26 a min the longitudinal direction and which is in communication with a source of pressurized gas, such as an air compressor 26 a 2 .
- the nozzle 26 is also provided with a first flow passage 27 which is defined between the outer surface of mandrel 26 a and a partition wall 26 b formed in the nozzle 26 and which communicates with the dispensing passage 23 a through a valve 29 .
- the nozzle 26 is further provided with a second passage 28 in the form of a ring and concentric with the first passage 27 , and the second flow passage 28 is defined between the partition wall 26 b and a body 26 c of the nozzle 26 .
- the bottom ends of the first and second flow passages 27 and 28 meet at a point close to the bottom end surface of the nozzle 26 thereby defining a parison discharge opening 26 d between the nozzle body 26 c and the bottom end of the mandrel 26 a .
- the first flow passage 27 is communicatable with the dispensing passage 23 a through the valve 29 ; whereas, the second flow passage 28 is communicatable with the dispensing passage 24 a through a valve 30 .
- the nozzle 26 is positioned above a mold bottom half (not shown) when a parison P is extruded out of the nozzle 26 .
- valves 29 and 30 are provided between the first passage 27 and dispensing passage 23 a and between the second passage 28 and dispensing passage 24 a , respectively, and these valves 29 and 30 are connected to a control unit 31 .
- the valves 29 and 30 control the flow rate of molten molding material flowing through the respective passages.
- the control unit 31 includes a microcomputer which controls the operation of each of the valves 29 and 30 in accordance with a selected program stored in memory also provided in the control unit 31 .
- each of the valves 29 and 30 be associated with the operation of each of the screws 25 , 25 thereby preventing the pressure inside each of the passages 23 a and 24 a from becoming excessive.
- a combination of a light source LS and a photodetector PD which are provided opposite to each other at a predetermined distance from the nozzle 26 .
- the light source LS directs a beam of light toward the photodetector PD, which supplies a signal to the control unit 31 for controlling the operation of each of the valves 29 and 30 .
- HD-PE is supplied to the first dispensing pipe 23 and LD-PE is supplied to the second dispensing pipe 24 .
- HD-PE in molten state flows through the valve 29 when open into the first flow passage 27 in the nozzle 26 to reach the discharge opening 26 d ; on the other hand, LD-PE in molten state flows through the valve 30 when open into the second flow passage 28 to reach the discharge opening 26 d.
- the valve 29 is set open and the first dispensing unit 23 is rendered operative while maintaining the valve 30 closed and the second dispensing unit 24 inoperative.
- the control unit 31 supplies a signal to the valve 29 to have it closed and the first dispensing unit 23 is rendered inoperative; at the same time, the valve 30 is set open and the second dispensing unit 24 is rendered operative. Because of this, the material discharged out of the nozzle 26 through the discharging opening 26 d is switched from HD-PE to LD-PE, which is the material to be used for forming the bellow section P 2 of product P.
- the control unit 31 Upon discharging of parison P 2 of LD-PE over a length 1 2 which corresponds to the length L 2 of bellow section P 2 , the control unit 31 again supplies a control signal to open the valve 29 and render the first dispensing unit 23 operative while causing the valve 30 to be shut off and the second dispensing unit 24 to be inoperative.
- the material discharged out of the discharge opening 26 d gradually changes from LD-PE to HD-PE.
- the parison thus discharged out of the discharge opening 26 d is placed into a groove of a bottom mold half (not shown) positioned below the nozzle 26 .
- the corresponding top mold half is clamped to the bottom mold half and a pressurized gas is introduced into the parison placed between the mold halves which are clamped together.
- the pressurized gas is introduced into the parison through the air passage 26 a 1 as supplied from the pressurized gas source 26 a 2
- blow molding is carried out and there is obtained a molded plastic product P having the bellow section P 2 having an increased stretchability.
- valves 29 and 30 are operated to be open and closed in association with the operation of the first and second dispensing units 23 and 24 in order to implement switching of materials to be discharged out of the opening 26 d .
- the switching of discharged materials may also be carried out by controlling the operating conditions of first and second dispensing units 23 and 24 while maintaining the valves 29 and 30 intact. In this case, the interface between the two sections different in material would be more inclined and this interface region with the presence of two different materials would be produced much larger.
- FIG. 9 shows a modified apparatus which is similar to the apparatus shown in FIG. 7 structurally in many respects. It is to be noted that hereinbelow like numerals will be used to indicate like elements with omitting repeated description with respect thereto.
- no valves are provided in the passages for supplying molten molding materials to the discharge opening 26 d of nozzle 26 , as different from the previous embodiment.
- the mandrel 32 is coupled to a driving unit 33 , such as a cylinder unit, which causes the mandrel 32 to move up and down with respect to the nozzle 26 .
- the driving unit 33 is also connected to the control unit 31 so that its operation is controlled in accordance with a control signal supplied from the control unit 31 .
- the flow condition of molten molding material through the first flow passage 27 is controlled by the relative positional relation between the mandrel 32 and the nozzle 26 .
- the mandrel 32 is formed with an outwardly projecting ridge 34 as continuously extending in the circumferential direction and located at a position close to its bottom end.
- the intermediate wall 26 b cylindrical in shape and depending from the merging point between the first and second flow passages 27 and 28 in the nozzle 26 is similarly formed with an inwardly projecting ridge 35 as continuously extending in the circumferential direction and located at its bottom.
- These ridges 34 and 35 are so formed in height that they may be brought into sealing contact when the mandrel 32 is pulled upward to its upper limit position.
- the mandrel 32 when the mandrel 32 is located at its upper limit position where the ridges 34 and 35 are in sealing contact, the first flow passage 27 is blocked so that no material can be discharged through the opening 26 d as supplied from the first flow passage 27 .
- the supply of material from the first flow passage 27 to the discharge opening 26 d may be controlled by controlling the position of the mandrel 32 with respect to the nozzle 26 .
- the apparatus illustrated in FIG. 9 is suitable for use in manufacturing a hollow plastic product having a two layer structure in part. Described more in detail in this respect, if it is desired to form a parison p′ having a two-layer structure in part as shown in FIG. 10, the mandrel 32 is initially set at its upper limit position with the ridges 34 and 35 maintained in contact to block the first flow passage and a molten molding material is discharged out of the opening 26 d as supplied only from the second flow passage 28 , thereby forming a single layer portion p 1 ′.
- the mandrel 32 is moved downward to cause the ridges 34 and 35 separated away from each other thereby opening the first flow passage 27 to allow the other molten molding material to be supplied to the opening 26 d as supplied from the first flow passage 27 , so that there is formed a parison P 2 ′ having a two-layer structure.
- the mandrel 32 is pulled upward to bring the ridge 34 in contact with the ridge 35 to again block the first flow passage 27 thereby allowing only the material to be supplied to the opening 26 d from the second flow passage 28 .
- a parison p′ as shown in FIG. 10 just by moving the mandrel 32 relative to the nozzle 26 .
- the ridges 34 and 35 which, in effect, together function as a valve, are located closer to the discharge opening 26 d , the supply of material from the first flow passage 27 is controlled with an excellent responsiveness so that the interface region between the mono-layer and two-layer sections in the parison p′ may be minimized. This may also be viewed as an advantaged depending on the condition. Because, in the case where a plastic product is to be molded in a two-layer structure, the parion p′ shown in FIG. 10 may be used. In this case, the mono-layer sections p 1 ′ are produced as losses; however, since these loss sections are comprised of a single material, they may be collected for reuse.
- the apparatus shown in FIG. 9 may also be used to manufacture any of the plastic products shown in FIGS. 8 a through 8 c .
- the switching of material may be carried out by controlling the operating condition of the second dispensing unit 24 with the mandrel 32 held at its lowered position thereby keeping the ridges 34 and 35 separated away from each other.
- a valve similar to the valve 30 shown in FIG. 7, may be preferably provided at the junction between the second dispensing passage 24 a and the second flow passage 28 .
- FIG. 11 illustrates a further embodiment in which the intermediate cylindrical wall 26 b is so provided to be movable with respect to the body 26 c of nozzle 26 and the intermediate wall 26 b is also provided with an outwardly projecting ridge 36 as continuously extending in the circumferential direction at the outer peripheral surface thereof with a corresponding inwardly projecting ridge 37 formed at the body 26 c of nozzle 26 similarly as continuously extending in the circumferential direction.
- the mandrel 32 may be provided fixed in position with respect to the body 26 c of nozzle 26 .
- the intermediate wall 26 b may be moved up and down with respect to the mandrel 32 and body of nozzle 26 such that the ridges 34 and 35 are brought into contact to block the first flow passage 27 when the intermediate wall 26 b is positioned at its bottommost position with the ridges 36 and 37 being separated away from each other to open the second flow passage 28 and the ridges 34 and 35 are separated away from each other to open the first flow passage 27 with the ridges 36 and 37 being brought into contact to block the second flow passage 28 when the intermediate wall 26 b is positioned at its uppermost position.
- the switching of molding materials may be easily carried out just by moving the intermediate wall 26 b up and down.
- FIG. 12 illustrates a still further embodiment of the present invention, which is suitable for use in manufacturing a plastic product having a three-layer structure, such as the one shown in FIG. 6, in which the sandwiched layer and the two sandwiching layers are comprised of respective different materials.
- the two different molding materials to be used for the sandwiched and sandwiching layers have a good affinity or conformability, and typical combinations of materials will be tabulated below.
- sandwiching layer sandwiched layer 1. polycarbonate methylmethacrylate foam 2.
- polystyrene styrene-butadiene-styrene 3.
- polypropylene polystyrene foam 4.
- ABS resin polystyrene foam 5.
- the two molding materials to be used in combination in the present embodiment should not be limited only to the above, but many other combinations are also possible. If desired for some reason, two different molding materials, which have a poor affinity, may also be used in combination as long as an appropriate adhesive agent is provided between the two adjacent layers comprised of these different materials.
- the nozzle 26 is formed with three flow passages 38 , 39 and 40 , in which the first and third passages 38 and 40 are commonly in communication with the second dispensing passage 24 a and the sandwiched, second flow passage 39 is in communication with the first dispensing passage 23 a .
- the valves 29 and 30 are provided in the respective passages.
- valve 29 is shut off and the first dispensing unit 23 is rendered inoperative while maintaining the valve 30 open and the second dispensing unit 24 in operation thereby causing the molding material supplied from the second dispensing unit 24 to be continuously discharged out of the discharge opening 26 d to form a parion having a two-layer structure, which in effect is a single layer structure since the two layers are comprised of the same material.
- the molding material supplied from the second dispensing unit 24 is relatively hard so that the that portion of the parison discharged out of the discharge opening 26 d which is comprised only of the material supplied from the second dispensing unit 24 will be used for defining the mouth section 22 of the plastic bottle C.
- a flash formed in the present embodiment is mostly comprised of the material supplied from the second dispensing unit 24 so that the flash may be collected for reuse.
- the intermediate wall 26 b separating the first passage 38 from the second passage 39 may be so provided to be movable up and down with respect to the body 26 c of nozzle 26 thereby controlling the flow of molding material supplied through the second passage 39 .
- a valve may be provided one for each of the three passages with such a structure, a three-layer structure may be formed with three layers which are comprised of different materials.
- a plastic product having a three-layer structure which includes an inner layer comprised of LD-PE, an intermediate layer comprised of ethylene-vinyl-acetate and an outer layer comprised of HD-PE may be easily manufactured.
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Abstract
A method and apparatus for manufacturing a hollow plastic product is provided. In accordance with one aspect, into a mold half having a tubular groove portion and a projecting groove portion which projects outwardly from the tubular groove section is supplied a parison into the tubular groove portion and a clump of molding material into the projecting groove portion, and when blow molding is carried out by introducing a pressurized gas into the parison, the clump becomes integrated with the parison thereby providing a plastic product of unitary structure. In accordance with another aspect of the present invention, a parison extrusion nozzle is provided with at least two passages each of which is connected, preferably through a valve, to a corresponding dispensing unit for dispensing a desired molding material. A control unit is provided as connected to each of the dispensing units to control the supply of molding material so that there is obtained a parison having regions of different molding materials.
Description
- 1. Field of the Invention
- This invention relates to manufacturing of a hollow plastic product and in particular to a method and apparatus for manufacturing a hollow plastic product having an irregular structure, such as a projection which projects outwardly from the outer surface of the product or change in composition. More specifically, the present invention relates to a blow molding technique for fabricating a hollow plastic product having a desired shape which cannot be manufactured by the conventional blow molding technology.
- 2. Description of the Prior Art
- If it is desired to manufacture a hollow
plastic product 2 having a projection 1 which projects outwardly from the outer surface of amain body 2′ in accordance with the typical prior art technique, themain body 2′ is first fabricated by blow molding and then the projection, which has been previously fabricated by any appropriate method, such as injection molding, is fixedly attached to themain body 2′. Such an approach is not advantageous because it requires a multiple of separate steps to carry out in manufacture and the connection between themain body 2′ and the later-attached projection 1 is not reliable and low in strength. On the other hand, it is true that the projection 1 may be manufactured together with themain body 2′ at the same time by blow molding; in this case, however, a significantly large flash is necessarily formed, and, thus it is expensive and time consuming to remove such a large flash, not to mention the production of significant waste of material. - Furthermore, it is sometimes desired that a hollow plastic product differs in composition depending on the location thereby providing different properties. For example, a hollow plastic tube is often desired to have a relatively hard section to be fixedly attached to a metal fitting or the like and another section which is relatively soft for providing an easy bending characteristic. In such a case, a typical prior art approach would be to first form different sections separately and then put them together to form a final product and such an approach is disadvantageous because such a multistep process would be time consuming and expensive and the integrity of the final product is relatively poor.
- It is therefore a primary object of the present invention to obviate the disdavantageous of the prior art as described above and to provide an improved method and apparatus for manufacturing a hollow plastic product.
- Another object of the present invention is to provide an improved method and apparatus for manufacturing a hollow plastic product having a projection which projects outwardly from the outer surface of the product.
- A further object of the present invention is to provide an improved blow molding method and apparatus for manufacturing a hollow plastic product having any desired shape and structure.
- A still further object of the present invention is to provide an improved blow molding method and apparatus capable of manufacturing a hollow plastic product having locally different compositions and properties.
- A still further object of the present invention is to provide an improved blow molding method and apparatus capable of manufacturing a hollow plastic product having a complicated structure in a reduced number of steps.
- Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.
- FIG. 1 is a perspective view showing a hollow plastic product having an outwardly extending projection which may be manufactured advantageously in accordance with the present invention;
- FIG. 2 is a front view showing the overall structure of apparatus for manufacturing a hollow plastic product constructed in accordance with one embodiment of the present invention;
- FIG. 3 is a schematic illustration showing a modified apparatus including a separate supply line for supplying additional molding material;
- FIG. 4 is a plan view showing a mold half having a groove provided with an outwardly extending
projection 10 a; - FIG. 5 is a schematic illustration showing the condition in which the upper and lower mold halves are about to be brought into contact with a
parison 13 and a clump of molding material in place; - FIG. 6 is a cross-sectional view showing a plastic container having a three layer structure, which may be advantageously manufactured according to the method of present invention;
- FIG. 7 is a schematic illustration showing a novel blow molding apparatus constructed in accordance with another embodiment of the present invention;
- FIGS. 8a through 8 c are schematic illustrations in cross-section showing several typical hollow plastic products which may be advantageously manufactured by the apparatus shown in FIG. 7;
- FIG. 9 is a schematic illustration showing a modified blow molding apparatus constructed in accordance with a further embodiment of the present invention;
- FIG. 10 is a schematic illustration showing in cross-section a parison p′ having a local two-layer structure suitable for forming a plastic product having two layers different in material;
- FIG. 11 is a schematic illustration showing a further modified blow molding apparatus constructed in accordance with a still further embodiment of the present invention; and
- FIG. 12 is a schematic illustration showing a still further modified blow molding apparatus for forming a three-layer plastic product constructed in accordance with a still further embodiment of the present invention.
- In accordance with the first aspect of the present invention, there is provided a process for manufacturing a hollow plastic product including at least one tubular section and at least one projecting section projecting outwardly from said tubular section, comprising the steps of: preparing a first mold half engraved with a first groove defining a part of mold cavity corresponding in shape to a hollow plastic product to be molded, said first groove including at least one tubular portion and at least one projecting portion which correspond to the tubular and projecting sections of the product, respectively; supplying a clump of first molten molding material to said at least one projecting portion; supplying a parison of second molten molding material to said at least one tubular portion; bringing a second mold half engraved with a second groove defining the remaining part of the mold cavity into contact with the first mold half; and blowing a pressurized gas into the parison while maintaining the first and second mold halves clamped together. In the preferred embodiment, the first and second molten molding materials are identical.
- Referring now to FIG. 2, there is shown a blow molding apparatus constructed in accordance with one embodiment of the present invention, in which a
hopper 3 stores a quantity of molding material, such as any well-known plastic material suitable for use in blow molding, and adispensing tube 4 is provided at the bottom of thehopper 3 extending horizontally and in communication with thehopper 3. At the forward end of the dispensingtube 4 is provided an extrusion nozzle 5 and an auger screw 6 is rotatably housed in the dispensingtube 4. A heat band 7 is wrapped around the outer peripheral surface of thetube 4 thereby allowing the molding material in transportation through thetube 4 to be molten in state and thus easily flowable. Thus, as the screw 6 is driven to rotate, the molding material in thehopper 3 is fed into the dispensing tube 7 and the molding material thus fed becomes molten in state due to the heat applied from the heater band 7 and transported toward its forward end, or the extrusion nozzle 5. - The molten molding material thus transported is extruded from the nozzle5 in the form of a parison which is then supplied into a first groove (shown by the dotted line in FIG. 2) engraved in a
first mold half 9, which, in turn, is fixedly mounted on a turntable. Above the turntable at a different location is disposed asecond mold half 14 engraved with a second groove, which defines a mold cavity corresponding in outer shape to a plastic product to be molded when the first and second mold halves are brought into mating contact. Thesecond mold half 14 is supported to be vertically movable and thus thesecond mold half 14 may be brought into contact with thefirst mold half 9 set in position therebelow. Although not shown specifically since it is selfevident for one skilled in the art, the first and second mold haves 9 and 14 in mating contact are clamped and a pressurized gas may be introduced into the parison placed between the clamped mold halves to carry out blow molding. Thereafter, when the parison sufficiently cools down to a point that it can maintain its molded shape, thesecond mold half 14 is moved upward as separated away from thefirst mold half 9 fixedly attached to the turntable. The apparatus illustrated in FIG. 2 is advantageous because two or morefirst mold halves 9 may be provided on the turntable to carry out different steps in parallel. - The apparatus shown in FIG. 2 is advantageously modified as shown in FIG. 3 for manufacturing a hollow plastic product having a projection shown in FIG. 1. That is, in the structure shown in FIG. 3, there is provided a bypass pipe4 a extending from and in communication with the dispensing
pipe 4. The bypass pipe 4 a is provided with acontrol valve 4 b which controls the opening and closing of the bypass pipe 4 a. FIG. 4 illustrates in plan view of thefirst mold half 9 having a groove engraved therein, which defines a mold cavity when it is brought into mating contact with thesecond mold half 14. The mold half illustrated in FIG. 4 is to be used for manufacturing the hollow plastic product shown in FIG. 1, which includes themain body 2′, which is tubular and generally in the shape of “S”, and the single projection 1 which projects outwardly from the outer peripheral surface of themain body 2′. Thus, as. shown in FIG. 4, the groove engraved in thefirst mold half 9 includes a generally S-shaped half-tube portion and a projectingportion 10 a, which corresponds to the projection 1 in shape. - In accordance with this aspect of the present invention, the S-shaped portion of the groove engraved in the
first mold half 9 is supplied with aparison 13 extruded out of the extrusion nozzle 5 including an outer cylinder 11 and amandrel 12 which extends through the outer cylinder 11 with a gap therebetween, with the gap being in fluidic communication with the dispensingpipe 4. Thus, theparison 13 is formed as the molten molding material is extruded out of the nozzle 5 as supplied from the dispensingpipe 4 through the gap defined between the outer cylinder 11 and themandrel 12. On the other hand, the molten molding material in the dispensingpipe 4 is also supplied to theprojection portion 10 a of thefirst molding half 9 through the bypass pipe 4 a by operating thevalve 4 b. The molten molding material supplied through the bypass pipe 4 a is in the form of a clump and such a clump is preferably is slightly larger in volume than the projection cavity defined by the projectingportion 10 a when the two mold halves are brought into contact. It is to be noted, however, that in the case where the molding material stored in thehopper 3 is sufficiently molten in state, it may be partly taken out of thehopper 3 by hand or any appropriate tool and supplied to the projectingportion 10 a in thefirst mold half 9. - The condition with the
parison 13 being placed in the S-shapedtubular groove portion 10 and theclump 8 of molten molding material placed in the projectinggroove portion 10 a of thefirst mold half 9 is seen in FIG. 5. After placing theparison 13 and theclump 8 in position as shown in FIG. 5, thesecond mold half 14 is brought into mating contact with thefirst mold half 9 as indicated by the arrows in FIG. 5. Thereafter, as is known for one skilled in the art, the first andsecond mold halves parison 13 placed in the mold cavity defined between the twomold halves clump 8 becomes well integrated with theparison 13 thereby forming a plastic product of unitary structure. In order to secure an excellent integrity between the resultingtubular section 2′ and the projection 1, it is only necessary that theclump 8 be supplied slightly larger in volume than the projection cavity defined by the projectingportions mold halves - In the illustrated embodiment, the
clump 8 is same in material as theparison 13. However, theclump 8 may differ in material from theparison 13, but it is important that the material ofclump 8 be conformable with the material ofparison 13 when different materials are used. Thus, it is most preferable that theclump 8 andparison 13 are same in material. - After introduction of pressurized gas, the
mold halves mold halves - As described above, in accordance with this aspect of the present invention, the formation of a flash may be minimized even if a desired plastic product to be molded has a projection which extends significantly outwardly from the outer peripheral surface of the product. Minimization of flash formation indicates minimization in secondary processing for flash removal and in waste of material. Furthermore, since the
clump 8 becomes integrated with theparison 13 after blow molding, there is obtained a plastic product of unitary structure even if the plastic product has an irregularly shaped portion such as a projection so that the product is high in integrity and in durability. Thus, the product manufactured according to the present invention may be advantageously used as a duct which is subjected to severe vibration, e.g., duct of automobile air conditioner. - FIG. 6 shows another plastic product c having a multilayer structure which can be advantageously manufactured by blow molding in accordance with another aspect of the present invention. As shown, the product c is a bottle-shaped container and it has a three layer structure excepting its
mouth section 22. That is, thebody 21 of container c includes relatively rigid outer and inner layers 21 a and 21 c and a foam material layer 21 b which is sandwiched between the outer and inner layers 21 a and 21 c and which is excellent in heat shielding characteristic though its rigidity is rather poor. Themouth section 22 is formed as a single layer from a relatively rigid material because threads are formed at the outer peripheral surface thereof. When manufacturing such a container c according to a typical prior art method, the body andmouth sections mouth sections mouth sections - FIG. 7 illustrates in schematic an apparatus for manufacturing a hollow plastic product having regions of different compositions and this structure may be advantageously implemented in the apparatus shown in FIG. 2. The apparatus shown in FIG. 7 may be used to manufacture various types of hollow plastic products having regions of different compositions. Some of the examples which may be manufactured using the apparatus shown in FIG. 7 are shown in FIGS. 8a through 8 c. A hollow plastic product P shown in FIG. 8a includes a bellow section P2 and a pair of straight pipe sections P10 and P11, each at each end of the bellow section P2. In the illustrated example, the bellow section P2 is comprised of a relatively soft material, such as low-density polyethylene (LD-PE), and the straight pipe sections P10 and P11 are comprised of a relatively rigid material, such as high-density polyethylene (HD-PE), so that the pipe P has an increased stretchability. On the other hand, FIG. 8b shows another hollow plastic product J having a pipe section J1 comprised of a relatively rigid material and a pair of connecting sections J2 and J2, each comprised of a relatively soft material. With such a pipe J, the connecting section J2 may be easily fitted onto an object to be connected. FIG. 8c shows an elbow V which includes a curved pipe section V2 comprised of a relatively soft material and a pair of connecting sections V1 and V1, each comprised of a relatively hard material. In all of these illustrated products, it includes different regions comprised of different materials having different characteristics. And, these products are preferably manufactured by the apparatus shown in FIG. 7.
- Referring now to FIG. 7, a pair of dispensing
pipes extrusion nozzle 26 as extending from respective hoppers (not shown). The pair of dispensingpipes passages 23 a and 24 a, respectively, each of which is provided with anauger screw 25. It is to be noted that each of the dispensingpipes screws - The
nozzle 26 is provided with amandrel 26 a having a convergent bottom end as extending vertically and located at the center of thenozzle 26. Themandrel 26 a is provided with acenter hole 26 a 1 which extends through themandrel 26 a min the longitudinal direction and which is in communication with a source of pressurized gas, such as anair compressor 26 a 2. Thenozzle 26 is also provided with afirst flow passage 27 which is defined between the outer surface ofmandrel 26 a and apartition wall 26 b formed in thenozzle 26 and which communicates with the dispensingpassage 23 a through avalve 29. Thenozzle 26 is further provided with asecond passage 28 in the form of a ring and concentric with thefirst passage 27, and thesecond flow passage 28 is defined between thepartition wall 26 b and abody 26 c of thenozzle 26. The bottom ends of the first andsecond flow passages nozzle 26 thereby defining aparison discharge opening 26d between thenozzle body 26 c and the bottom end of themandrel 26 a. Thefirst flow passage 27 is communicatable with the dispensingpassage 23 a through thevalve 29; whereas, thesecond flow passage 28 is communicatable with the dispensing passage 24 a through avalve 30. It is to be noted that thenozzle 26 is positioned above a mold bottom half (not shown) when a parison P is extruded out of thenozzle 26. - As described above, the
valves first passage 27 and dispensingpassage 23 a and between thesecond passage 28 and dispensing passage 24 a, respectively, and thesevalves control unit 31. Thus, under control of thecontrol unit 31, thevalves control unit 31 includes a microcomputer which controls the operation of each of thevalves control unit 31. It is also important that the operation of each of thevalves screws passages 23 a and 24 a from becoming excessive. Also provided is a combination of a light source LS and a photodetector PD, which are provided opposite to each other at a predetermined distance from thenozzle 26. The light source LS directs a beam of light toward the photodetector PD, which supplies a signal to thecontrol unit 31 for controlling the operation of each of thevalves - It will now be explained a process for manufacturing the hollow plastic product shown in FIG. 8a using the apparatus shown in FIG. 7. As described before, in the case of manufacturing the pipe P having the bellow section P2, it is preferable to use a soft resin material, such as LD-PE, for the bellow-section P2 and a hard resin material, such as HD-PE, for the other sections P10 and P11. As an alternative, however, use may be made of a combination of hard vinyl chloride and soft vinyl chloride. In the preferred embodiment, soft and hard resin materials are selected to have an affinity such that they can stick together strongly at the interface thereby allowing to form an integrated structure or gradual change in composition. However, use may also be made of a combination of hard and soft resin materials having a relatively poor affinity, for example, by providing an adhesive agent between the two materials.
- For the purpose of explanation, it will be assumed here that HD-PE is supplied to the
first dispensing pipe 23 and LD-PE is supplied to thesecond dispensing pipe 24. Thus, HD-PE in molten state flows through thevalve 29 when open into thefirst flow passage 27 in thenozzle 26 to reach thedischarge opening 26 d; on the other hand, LD-PE in molten state flows through thevalve 30 when open into thesecond flow passage 28 to reach thedischarge opening 26 d. - In the first place, in order to form a parison section P10, corresponding to the pipe section P10 of pipe P which is comprised of HD-PE, the
valve 29 is set open and thefirst dispensing unit 23 is rendered operative while maintaining thevalve 30 closed and thesecond dispensing unit 24 inoperative. As soon as the parison P10 has been discharged over a length 110 corresponding to the length L10 of pipe section P10 of product P, thecontrol unit 31 supplies a signal to thevalve 29 to have it closed and thefirst dispensing unit 23 is rendered inoperative; at the same time, thevalve 30 is set open and thesecond dispensing unit 24 is rendered operative. Because of this, the material discharged out of thenozzle 26 through the dischargingopening 26 d is switched from HD-PE to LD-PE, which is the material to be used for forming the bellow section P2 of product P. - In this instance, since the
discharge opening 26 d is located as separated away from each of thevalves respective valves discharge opening 26 d. Thus, as shown in FIG. 7, the interface between the two sections in the discharged parison becomes inclined with respect to the longitudinal axis of the discharged parison. This may be viewed as an advantage in a sense because the material change does not take place suddenly and there is formed a gradual change in mechanical strength. - Upon discharging of parison P2 of LD-PE over a length 1 2 which corresponds to the length L2 of bellow section P2, the
control unit 31 again supplies a control signal to open thevalve 29 and render thefirst dispensing unit 23 operative while causing thevalve 30 to be shut off and thesecond dispensing unit 24 to be inoperative. Thus, the material discharged out of thedischarge opening 26 d gradually changes from LD-PE to HD-PE. Then, the parison thus discharged out of thedischarge opening 26 d is placed into a groove of a bottom mold half (not shown) positioned below thenozzle 26. Thereafter, as is obvious for one skilled in the art, the corresponding top mold half is clamped to the bottom mold half and a pressurized gas is introduced into the parison placed between the mold halves which are clamped together. In this instance, the pressurized gas is introduced into the parison through theair passage 26 a 1 as supplied from the pressurizedgas source 26 a 2 In this manner, blow molding is carried out and there is obtained a molded plastic product P having the bellow section P2 having an increased stretchability. - In the above-described embodiment, the
valves second dispensing units opening 26 d. However, as an alternative method, the switching of discharged materials may also be carried out by controlling the operating conditions of first andsecond dispensing units valves - FIG. 9 shows a modified apparatus which is similar to the apparatus shown in FIG. 7 structurally in many respects. It is to be noted that hereinbelow like numerals will be used to indicate like elements with omitting repeated description with respect thereto. In the present embodiment, no valves are provided in the passages for supplying molten molding materials to the
discharge opening 26 d ofnozzle 26, as different from the previous embodiment. In the structure illustrated in FIG. 9, themandrel 32 is coupled to a drivingunit 33, such as a cylinder unit, which causes themandrel 32 to move up and down with respect to thenozzle 26. The drivingunit 33 is also connected to thecontrol unit 31 so that its operation is controlled in accordance with a control signal supplied from thecontrol unit 31. As will become clear later, the flow condition of molten molding material through thefirst flow passage 27 is controlled by the relative positional relation between themandrel 32 and thenozzle 26. - Described more in detail as to the structure shown in FIG. 9, the
mandrel 32 is formed with an outwardly projectingridge 34 as continuously extending in the circumferential direction and located at a position close to its bottom end. Furthermore, theintermediate wall 26 b, cylindrical in shape and depending from the merging point between the first andsecond flow passages nozzle 26 is similarly formed with an inwardly projectingridge 35 as continuously extending in the circumferential direction and located at its bottom. Theseridges mandrel 32 is pulled upward to its upper limit position. Thus, when themandrel 32 is located at its upper limit position where theridges first flow passage 27 is blocked so that no material can be discharged through theopening 26 d as supplied from thefirst flow passage 27. In effect, the supply of material from thefirst flow passage 27 to thedischarge opening 26 d may be controlled by controlling the position of themandrel 32 with respect to thenozzle 26. - The apparatus illustrated in FIG. 9 is suitable for use in manufacturing a hollow plastic product having a two layer structure in part. Described more in detail in this respect, if it is desired to form a parison p′ having a two-layer structure in part as shown in FIG. 10, the
mandrel 32 is initially set at its upper limit position with theridges opening 26 d as supplied only from thesecond flow passage 28, thereby forming a single layer portion p1′. Then, themandrel 32 is moved downward to cause theridges first flow passage 27 to allow the other molten molding material to be supplied to theopening 26 d as supplied from thefirst flow passage 27, so that there is formed a parison P2′ having a two-layer structure. Thereafter, themandrel 32 is pulled upward to bring theridge 34 in contact with theridge 35 to again block thefirst flow passage 27 thereby allowing only the material to be supplied to theopening 26 d from thesecond flow passage 28. As a result, there is obtained a parison p′ as shown in FIG. 10 just by moving themandrel 32 relative to thenozzle 26. - In the above-described embodiment, since the
ridges discharge opening 26 d, the supply of material from thefirst flow passage 27 is controlled with an excellent responsiveness so that the interface region between the mono-layer and two-layer sections in the parison p′ may be minimized. This may also be viewed as an advantaged depending on the condition. Because, in the case where a plastic product is to be molded in a two-layer structure, the parion p′ shown in FIG. 10 may be used. In this case, the mono-layer sections p1′ are produced as losses; however, since these loss sections are comprised of a single material, they may be collected for reuse. - It should further be noted that the apparatus shown in FIG. 9 may also be used to manufacture any of the plastic products shown in FIGS. 8a through 8 c. In this case, the switching of material may be carried out by controlling the operating condition of the
second dispensing unit 24 with themandrel 32 held at its lowered position thereby keeping theridges discharge opening 26 d, a valve, similar to thevalve 30 shown in FIG. 7, may be preferably provided at the junction between the second dispensing passage 24 a and thesecond flow passage 28. - FIG. 11 illustrates a further embodiment in which the intermediate
cylindrical wall 26 b is so provided to be movable with respect to thebody 26 c ofnozzle 26 and theintermediate wall 26 b is also provided with an outwardly projectingridge 36 as continuously extending in the circumferential direction at the outer peripheral surface thereof with a corresponding inwardly projectingridge 37 formed at thebody 26 c ofnozzle 26 similarly as continuously extending in the circumferential direction. In this case, themandrel 32 may be provided fixed in position with respect to thebody 26 c ofnozzle 26. With this structure, theintermediate wall 26 b may be moved up and down with respect to themandrel 32 and body ofnozzle 26 such that theridges first flow passage 27 when theintermediate wall 26 b is positioned at its bottommost position with theridges second flow passage 28 and theridges first flow passage 27 with theridges second flow passage 28 when theintermediate wall 26 b is positioned at its uppermost position. In this manner, the switching of molding materials may be easily carried out just by moving theintermediate wall 26 b up and down. - FIG. 12 illustrates a still further embodiment of the present invention, which is suitable for use in manufacturing a plastic product having a three-layer structure, such as the one shown in FIG. 6, in which the sandwiched layer and the two sandwiching layers are comprised of respective different materials. In this case, the two different molding materials to be used for the sandwiched and sandwiching layers have a good affinity or conformability, and typical combinations of materials will be tabulated below.
sandwiching layer sandwiched layer 1. polycarbonate methylmethacrylate foam 2. polystyrene styrene-butadiene- styrene 3. polypropylene polystyrene foam 4. ABS resin polystyrene foam 5. HD-PE LD-PE - It is to be noted that the two molding materials to be used in combination in the present embodiment should not be limited only to the above, but many other combinations are also possible. If desired for some reason, two different molding materials, which have a poor affinity, may also be used in combination as long as an appropriate adhesive agent is provided between the two adjacent layers comprised of these different materials.
- In the apparatus illustrated in FIG. 12, the
nozzle 26 is formed with threeflow passages third passages second flow passage 39 is in communication with thefirst dispensing passage 23 a. Similarly with the apparatus shown in FIG. 7, thevalves plastic product 22 of FIG. 6, a parison having a three-layer structure is first discharged out of thedischarge opening 26 d with both of thevalves second dispensing units valve 29 is shut off and thefirst dispensing unit 23 is rendered inoperative while maintaining thevalve 30 open and thesecond dispensing unit 24 in operation thereby causing the molding material supplied from thesecond dispensing unit 24 to be continuously discharged out of thedischarge opening 26 d to form a parion having a two-layer structure, which in effect is a single layer structure since the two layers are comprised of the same material. - In this case, the molding material supplied from the
second dispensing unit 24 is relatively hard so that the that portion of the parison discharged out of thedischarge opening 26 d which is comprised only of the material supplied from thesecond dispensing unit 24 will be used for defining themouth section 22 of the plastic bottle C. It should further be noted that a flash formed in the present embodiment is mostly comprised of the material supplied from thesecond dispensing unit 24 so that the flash may be collected for reuse. - As a modified structure, the
intermediate wall 26 b separating thefirst passage 38 from thesecond passage 39 may be so provided to be movable up and down with respect to thebody 26 c ofnozzle 26 thereby controlling the flow of molding material supplied through thesecond passage 39. In this case, as described with respect to the previous embodiments, it is preferable to provide a pair of engageable ridges. If so structured, the switching of materials may be carried out at an increased responsiveness, and the amount of loss of material may be minimized. As a further modification, there may be provided three dispensing units, one for each of the three flow passages 38-40. And, furthermore, a valve may be provided one for each of the three passages with such a structure, a three-layer structure may be formed with three layers which are comprised of different materials. As an example, a plastic product having a three-layer structure, which includes an inner layer comprised of LD-PE, an intermediate layer comprised of ethylene-vinyl-acetate and an outer layer comprised of HD-PE may be easily manufactured. - While the above provides a full and complete disclosure of the preferred embodiments of the present invention, various modifications, alternate constructions and equivalents may be employed without departing from the true spirit and scope of the invention. Therefore, the above description and illustration should not be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (17)
1. A process for manufacturing a hollow plastic product including at least one tubular section and at least one projecting section projecting outwardly from said tubular section, comprising the steps of:
preparing a first mold half engraved with a first groove defining a part of mold cavity corresponding in shape to said hollow plastic product to be molded, said first groove including at least one tubular portion and at least one projecting portion which correspond to said tubular and projecting sections of the product, respectively;
supplying a clump of first molten molding material to said at least one projecting portion of said first mold half;
supplying a parison of second molten molding material to said at least one tubular portion of said first mold half;
bringing a second mold half engraved with a second groove defining the remaining part of the mold cavity into contact with the first mold half; and
introducing a pressurized gas into said parison while maintaining said first and second mold halves clamped together, thereby carrying out blow molding to have said clump and said parison integrated together.
2. The process of wherein said first and second molten molding materials are identical.
claim 1
3. The process of wherein said first molten molding material is a part of said second molten molding material.
claim 2
4. The process of wherein a plurality of said first mold halves are mounted on a turntable, which is driven to rotate intermittently, wherein said steps for supplying said clump and said parison are carried out when one of said plurality of first mold halves located at a first station and said steps of bringing and introducing are carried out when another of said plurality of first mold halves located at a second station.
claim 1
5. Apparatus for manufacturing a hollow plastic product including at least one tubular section and at least one projecting section which projects outwardly from an outer surface of said tubular section, comprising:
a first mold half engraved with a first groove including at least one tubular portion corresponding to said tubular section of said product and at least one projecting portion corresponding to said projecting section of said product;
first supplying means for supplying a parison of first molding material as lying into said tubular groove portion of said first mold half;
second supplying means for supplying a clump of second molding material into said projecting groove portion of said first mold half;
a second mold half engraved with a second groove, which defines a mold cavity corresponding in outer shape to said product to be manufactured when said second mold half is brought into mating contact with said first mold half; and
means for introducing a pressurized gas into said parison while maintaining said first and second mold halves clamped together to carry out blow molding thereby causing said clump to become integrated with said parison.
6. The apparatus of wherein said first and second molding materials are identical.
claim 5
7. The apparatus of wherein said second supplying means includes a bypass line extending from said first supplying means for supplying a part of said first molding material to said projecting portion of said first mold half as a clump, said bypass line being provided with a valve which may be operated to open and close said bypass line.
claim 5
8. Apparatus for manufacturing a hollow plastic product having at least a first region mainly comprised of a first material and a second region mainly comprised of a second material, comprising:
parison discharging means for discharging a parison having a desired composition out of a discharge opening, said parison discharging means including at least one first passage leading to said opening and at least one second passage leading to said opening where said first and second passages join;
first supplying means for supplying a first molding material to said at least one first passage;
second supplying means for supplying a second molding material to said at least one second passage;
control means for controlling the operating condition of each of said first and second supplying means in accordance with said product to be manufactured, thereby causing said parison discharged out of said discharge opening to be different in composition; and
means for introducing a pressurized gas into said parison discharged out of said discharge opening and placed in a molding cavity defined by a mold to carry out blow molding.
9. The apparatus of said first and second supplying means includes first and second valves, respectively, wherein said first and second valves are operated under control of said control means.
claim 8
10. The apparatus of wherein each of said first and second valves is set open when the corresponding one of said first and second supplying means is set in operation and each of said first and second valves is closed when the corresponding one of said first and second supplying means is set inoperative.
claim 9
11. The apparatus of wherein each of said first and second supplying means includes a dispensing pipe and a screw rotatably fitted in said dispensing pipe.
claim 10
12. The apparatus of wherein said parison discharging means includes a nozzle formed with said first and second passages, said nozzle being provided with an intermediate, cylindrical wall which separates said first passage from said annular-shaped second passage, and a mandrel extending through said intermediate, cylindrical wall with its bottom end located approximately at said discharge opening.
claim 8
13. The apparatus of wherein said mandrel is provided to be vertically movable with respect to said nozzle, and said apparatus further comprises moving means for moving said mandrel with respect to said nozzle, said moving means being connected to said control means for receiving a control signal therefrom, said mandrel being provided with a first ridge which projects outwardly and continuously extends in the circumferential direction and said intermediate, cylindrical wall being provided with a second ridge which projects inwardly and continuously extends in the circumferential direction, whereby said first and second ridges are brought into contact when said madrel is located at its lower limit thereby blocking said first passage and said first and second ridges are separated away from each other when said mandrel is moved upward from said lower limit.
claim 12
14. The apparatus of wherein said intermediate, cylindrical wall is provided to be vertically movable with respect to said nozzle, said mandrel being provided with a first ridge which projects outwardly and continuously extends in the circumferential direction, said intermediate, cylindrical wall being provided with a second ridge which projects inwardly and continuously extends in the circumferential direction and a third ridge which projects outwardly and continuously extends interface are each a gradual transition thereby to yield a gradual change in mechanical strength from the first portion to the second portion and from the second portion to the third portion.
claim 12
16. The plastic pipe of , wherein said first resin material is a thermoplastic material and said second resin material is also a thermoplastic material.
claim 15
17. A blow-molded plastic pipe comprising:
a first plastic portion extending over a first length of said pipe and consisting of a first resin material;
a second plastic portion extending over a second length of said pipe and consisting of a second resin material, said second plastic portion being connected to said first plastic portion at a first interface between said first resin material and said second resin material; and
a third plastic portion extending over a third length of said pipe and consisting of the first resin material, said third plastic portion being connected to said second plastic portion at a second interface between said second resin material and said first resin material of said third plastic portion, wherein
the second plastic portion comprises a bellows structure and wherein the bellows structure consists of a softer material than said first plastic portion and said third plastic portion.
18. A blow-molded plastic pipe comprising:
a first plastic portion extending over a first length of said pipe and comprised of a first resin material;
a second plastic portion extending over a second length of said pipe and comprised of a second resin in the circumferential direction, and said nozzle being provided with a fourth ridge which extends inwardly and continuously extends in the circumferential direction, whereby when said intermediate, cylindrical wall is brought to its lower limit, said first and second ridges are brought into contact to block said first passage while leaving said second passage open and when said intermediate, cylindrical wall is brought to its upper limit, said third and fourth ridges are brought into contact to block said second passage while leaving said first passage open.
Applications Claiming Priority (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58073956A JPS59199218A (en) | 1983-04-28 | 1983-04-28 | Preparation of hollow molded article having projection |
JP59022993A JPS60168625A (en) | 1984-02-13 | 1984-02-13 | Manufacture of hollow molded article provided with composite material and manufacturing device thereof |
JP59-22993 | 1984-02-13 | ||
US06/663,810 US4659531A (en) | 1984-02-13 | 1984-10-22 | Method and apparatus for manufacturing a hollow plastic product |
US81526485A | 1985-12-23 | 1985-12-23 | |
US4963487A | 1987-05-13 | 1987-05-13 | |
US43095689A | 1989-11-01 | 1989-11-01 | |
US73272891A | 1991-07-18 | 1991-07-18 | |
US2489993A | 1993-03-02 | 1993-03-02 | |
US08/158,078 US5653265A (en) | 1984-02-13 | 1993-11-24 | Hollow plastic product |
US08/703,249 US6319454B1 (en) | 1984-02-13 | 1996-08-26 | Method and apparatus for manufacturing a hollow plastic product |
Publications (1)
Publication Number | Publication Date |
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US20010042947A1 true US20010042947A1 (en) | 2001-11-22 |
Family
ID=12098053
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Application Number | Title | Priority Date | Filing Date |
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US06/663,810 Expired - Lifetime US4659531A (en) | 1983-04-28 | 1984-10-22 | Method and apparatus for manufacturing a hollow plastic product |
US07/245,957 Expired - Lifetime US4907957A (en) | 1984-02-13 | 1988-09-15 | Molding apparatus for forming a parison and product of differing materials |
US08/158,078 Expired - Lifetime US5653265A (en) | 1983-04-28 | 1993-11-24 | Hollow plastic product |
US08/703,249 Expired - Fee Related US6319454B1 (en) | 1983-04-28 | 1996-08-26 | Method and apparatus for manufacturing a hollow plastic product |
US08/703,249 Granted US20010042947A1 (en) | 1983-04-28 | 1996-08-26 | Method for manufacturing a hollow plastic product |
Family Applications Before (4)
Application Number | Title | Priority Date | Filing Date |
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US06/663,810 Expired - Lifetime US4659531A (en) | 1983-04-28 | 1984-10-22 | Method and apparatus for manufacturing a hollow plastic product |
US07/245,957 Expired - Lifetime US4907957A (en) | 1984-02-13 | 1988-09-15 | Molding apparatus for forming a parison and product of differing materials |
US08/158,078 Expired - Lifetime US5653265A (en) | 1983-04-28 | 1993-11-24 | Hollow plastic product |
US08/703,249 Expired - Fee Related US6319454B1 (en) | 1983-04-28 | 1996-08-26 | Method and apparatus for manufacturing a hollow plastic product |
Country Status (3)
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US (5) | US4659531A (en) |
JP (3) | JPS60168625A (en) |
AU (1) | AU585522B2 (en) |
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1984
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-
1985
- 1985-08-14 AU AU46190/85A patent/AU585522B2/en not_active Ceased
-
1988
- 1988-09-15 US US07/245,957 patent/US4907957A/en not_active Expired - Lifetime
-
1989
- 1989-01-04 JP JP64000001A patent/JPH0618691B2/en not_active Expired - Lifetime
- 1989-08-28 JP JP1218494A patent/JPH0637051B2/en not_active Expired - Fee Related
-
1993
- 1993-11-24 US US08/158,078 patent/US5653265A/en not_active Expired - Lifetime
-
1996
- 1996-08-26 US US08/703,249 patent/US6319454B1/en not_active Expired - Fee Related
- 1996-08-26 US US08/703,249 patent/US20010042947A1/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090008822A1 (en) * | 2003-09-16 | 2009-01-08 | Tatsuya Nakagawa | Method for forming a hollow plastic product |
US7678324B2 (en) * | 2003-09-16 | 2010-03-16 | Excell Corporation | Method for forming a hollow plastic product |
Also Published As
Publication number | Publication date |
---|---|
JPH0637051B2 (en) | 1994-05-18 |
US4659531A (en) | 1987-04-21 |
AU585522B2 (en) | 1989-06-22 |
JPH0284305A (en) | 1990-03-26 |
US4907957A (en) | 1990-03-13 |
US5653265A (en) | 1997-08-05 |
JPH0618691B2 (en) | 1994-03-16 |
US6319454B1 (en) | 2001-11-20 |
AU4619085A (en) | 1987-02-19 |
JPH0215373B2 (en) | 1990-04-11 |
JPH02167705A (en) | 1990-06-28 |
JPS60168625A (en) | 1985-09-02 |
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