WO2010069042A1 - Préforme, pile de moules pour la fabrication du préforme et procédé d'orientation du préforme pendant le moulage soufflage - Google Patents

Préforme, pile de moules pour la fabrication du préforme et procédé d'orientation du préforme pendant le moulage soufflage Download PDF

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Publication number
WO2010069042A1
WO2010069042A1 PCT/CA2009/001677 CA2009001677W WO2010069042A1 WO 2010069042 A1 WO2010069042 A1 WO 2010069042A1 CA 2009001677 W CA2009001677 W CA 2009001677W WO 2010069042 A1 WO2010069042 A1 WO 2010069042A1
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WO
WIPO (PCT)
Prior art keywords
pattern
thickness
depressions
preform
protrusions
Prior art date
Application number
PCT/CA2009/001677
Other languages
English (en)
Inventor
Jean-Christophe Witz
Original Assignee
Husky Injection Molding Systems Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Husky Injection Molding Systems Ltd. filed Critical Husky Injection Molding Systems Ltd.
Publication of WO2010069042A1 publication Critical patent/WO2010069042A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/14—Making preforms characterised by structure or composition
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2701—Details not specific to hot or cold runner channels
    • B29C45/2708—Gates
    • B29C45/2711—Gate inserts
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/06—Making preforms by moulding the material
    • B29B11/08—Injection moulding
    • 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
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • 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
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • 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
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • 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
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • B29C2949/0772—Closure retaining means
    • B29C2949/0773—Threads
    • B29C2949/0774—Interrupted threads
    • 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
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • B29C2949/0777—Tamper-evident band retaining ring
    • 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
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/0778—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the flange
    • 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
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/078—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the bottom
    • 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
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0861—Other specified values, e.g. values or ranges
    • B29C2949/0872—Weight
    • 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
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/22—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at neck portion
    • 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
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/24—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at flange portion
    • 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
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/26—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at body portion
    • 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
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/28—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at bottom portion
    • 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
    • B29C2949/3024—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique
    • 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
    • B29C2949/3032—Preforms or parisons made of several components having components being injected
    • 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
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • 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
    • 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

Definitions

  • the present invention generally relates to, but is not limited to, molding systems and processes, and more specifically the present invention relates to, but is not limited to, a preform, a mold stack for producing the preform and a method for orienting the preform during blow molding.
  • Molding is a process by virtue of which a molded article can be formed from molding material by using a molding system.
  • Various molded articles can be formed by using the molding process, such as an injection molding process.
  • One example of a molded article that can be formed, for example, from polyethylene terephthalate (PET) material (or other suitable molding material) is a preform that is capable of being subsequently blown into a beverage container, such as, a bottle and the like.
  • PET polyethylene terephthalate
  • injection molding of PET material involves heating the PET material to a homogeneous molten state and injecting, under pressure, the so-melted PET material into a molding cavity defined, at least in part, by a female cavity piece and a male core piece mounted respectively on a cavity plate and a core plate of a mold.
  • the cavity plate and the core plate are urged together and are held together by clamp force, the clamp force being sufficient to keep the cavity and the core pieces together against the pressure of the injected PET material.
  • the molding cavity has a shape that substantially corresponds to a final cold-state shape of the molded article to be molded.
  • the so-injected PET material is then cooled to a temperature sufficient to enable ejection of the so-formed molded article from the mold.
  • a preform 100 is depicted, the preform 100 being an example of a typical prior art preform.
  • the preform 100 consists of a neck portion 102, a gate portion 106 and a body portion 104 extending between the neck portion 102 and the gate portion 106.
  • the preform 100 has a number of additional structural features that fulfill one or more functions.
  • a thread 108 within the neck portion 102, there is provided a thread 108.
  • the purpose for the thread 108 is to cooperate with a complementary thread of a closure device (not depicted) to maintain a substance (such as a beverage and the like) maintained within a final- shaped container produced from the preform 100 (when such a final-shaped container is blow- molded and eventually filled with the substance).
  • the neck portion 102 comprises a support ledge 1 12.
  • the support ledge 1 12 performs multiple functions including, but not limited to, cooperating with various handling devices and structures during injection molding and blow molding stages of production of the preform 100 (for example, cooperation with guiding rails) and the final-shaped container from the preform 100 (for example, cooperation with the blow-molding equipment to provide sealing, etc.).
  • the body portion 104 is associated with a substantially constant thickness along its side wall.
  • the base portion of the final-shaped container (and the preform 100) can be broadly classified into several categories. For example, it is typical to use a "champagne-style base" for final-shaped containers intended for soft drinks. It is also typical to use a “petaloid base” for final-shaped containers intended for carbonated drinks.
  • Le Guen discloses a thermoplastic container, such as a bottle, obtained by extrusion-blow or injection-blow molding and having a petaloid base (6, 7).
  • the base includes a convex wall (7) hemispherical in shape; the wall (7) is linked to the wall (2) forming the container body by a marginal zone (8) with a curve (Rl , R2).
  • Members (6) originate from the hemispherical wall (7) and are separated in pairs by a part thereof; the top end of each member is directly linked to the wall (2) forming the body.
  • Futral et al. teach molded plastic bottle that has a base having an outside surface rotationally symmetric about a longitudinal axis of the bottle including a convex heel and a central concavity separated by a standing ring supporting the bottle on an underlying surface.
  • the convex heel has an upper margin integrally formed with the sidewall of the bottle and a lower margin defining an outer portion of the standing ring.
  • the central concavity includes a first surface having a lower most portion defining an inner portion of the standing ring.
  • the standing ring inner portion and outer portion intersect in an abrupt edge with the inner portion of the standing ring generally being inclined with respect to the plane at an angle of between about 30 degrees and 50 degrees.
  • US patent 5,455,088 issued to Deemer on October 3, 1995 teaches a plastic bottle having a neck portion defining an opening, a generally tubular bottle body portion depending from the neck portion, and an integral bottle bottom structure closing a lowermost end of the bottle body portion including a continuous standing ring circumscribing a central push-up region that is blow molded from a preform which includes a generally tubular preform body portion having an outside wall face and an inside wall face and an integral preform bottom structure closing a lowermost end of the preform.
  • the preform body includes a cylindrical thickened portion which upon blowing forms the continuous standing ring.
  • the central push-up region of the plastic bottle is formed from that portion of the preform below the cylindrical thickened portion.
  • the portion of the preform below the cylindrical thickened portion includes features contributing to enhanced bottle bottom strength while minimizing the amount of resin employed in the structure.
  • a preform suitable for subsequent blow-molding into a final-shaped container comprises a neck portion; a gate portion; and a body portion extending between the neck portion and the gate portion; the gate portion including: a pattern of depressions and a pattern of protrusions interdisposed therebetween; the pattern of protrusions being associated with a first thickness, the body portion being associated with a second thickness along substantially the whole length thereof and the pattern of depressions being associated with a third thickness; wherein the first thickness is substantially the same as the second thickness and the third thickness is smaller that the second thickness.
  • a gate insert for forming a preform suitable for subsequent blow-molding into a final-shaped container, the preform including a neck portion; a gate portion; and a body portion extending between the neck portion and the gate portion; the gate portion including on an external skin thereof a pattern of depressions and a pattern of protrusions interdisposed therebetween; the pattern of protrusions being associated with a first thickness, the body portion being associated with a second thickness along substantially the whole length thereof and the pattern of depressions being associated with a third thickness; the first thickness is substantially the same as the second thickness and the third thickness is smaller that the second thickness.
  • the gate insert comprises a body defining: a nozzle receptacle for accepting, in use, a nozzle; a molding face, the molding face comprising a pattern of forming protrusions and a pattern of forming depressions; the pattern of forming protrusions and the pattern of forming depressions being configured to define, in use, the pattern of depressions and the pattern of protrusions, respectively
  • a core insert for forming a preform suitable for subsequent blow-molding into a final-shaped container, the preform including a neck portion; a gate portion; and a body portion extending between the neck portion and the gate portion; the gate portion including on an external skin thereof a pattern of depressions and a pattern of protrusions interdisposed therebetween; the pattern of protrusions being associated with a first thickness, the body portion being associated with a second thickness along substantially the whole length thereof and the pattern of depressions being associated with a third thickness; the first thickness is substantially the same as the second thickness and the third thickness is smaller that the second thickness.
  • the core insert comprises a core body portion configured for attachment, in use, to a core plate; a molding face configured to define, in use, an inner surface of the preform; the molding face comprising a defining pattern, the defining pattern including a pattern of forming protrusions and a pattern of forming depressions the pattern of forming protrusions and the pattern of forming depressions being configured to define, in use, the pattern of depressions and the pattern of protrusions, respectively
  • a method of orienting a preform during stretch-blow molding thereof into a final-shaped container the final-shaped container having a petaloid base that includes feet and areas between feet, the preform including a neck portion including a support ledge having a flower-shape design; a gate portion; and a body portion extending between the neck portion and the gate portion; the gate portion including on an external skin thereof a pattern of depressions and a pattern of protrusions interdisposed therebetween; the pattern of protrusions being associated with a first thickness, the body portion being associated with a second thickness along substantially the whole length thereof and the pattern of depressions being associated with a third thickness; the first thickness is substantially the same as the second thickness and the third thickness is smaller that the second thickness.
  • the method comprises orienting the support ledge during stretch-blow molding to orient the pattern of protrusions and the pattern of depressions such that the pattern of protrusions to be oriented where feet of the final-shaped container are to be defined and the pattern of depressions is oriented where areas between feet are to be defined.
  • Figure 1 depicts a cross section view of a preform 100 implemented in accordance with known designs.
  • Figure 2 depicts a perspective view of a preform 200 implemented according to a non-limiting embodiment of the present invention.
  • Figure 3 depicts a perspective view of a preform 300 implemented according to another non- limiting embodiment of the present invention.
  • Figure 4 depicts a perspective view from the top of a preform 400 implemented in accordance with yet another non-limiting embodiment of the present invention.
  • Figure 5 and Figure 6 depict a non-limiting embodiment of a gate insert 502, the gate insert 502 suitable for producing the preform 200 and the preform 300 (Figure 2 and Figure 3, respectively), in which Figure 5 depicts a perspective view thereof and Figure 6 depicts a cross section taken along a portion thereof.
  • Figure 7 depicts a core insert 702, implemented in accordance with a non-limiting embodiment of the present invention, the core insert 702 being suitable for producing the preform 400 of Figure 4.
  • Figure 8 and Figure 9 depict a non-limiting embodiment of a cavity insert 802, implemented in accordance with a non-limiting embodiment of the present invention, the cavity insert 802 being suitable for producing the preform 200 and preform 300 ( Figure 2 and Figure 3, respectively).
  • Figure 10 depicts a non-limiting embodiment of a portion of a final-shaped container 1002 produced from the preform 200, 300, 400.
  • Figure 1 1 depicts a bottom view of a final-shaped container 1 100, implemented in accordance with known designs.
  • Figure 12 depicts a bottom view of the final-shaped container 1002 of Figure 10.
  • Inventors have developed embodiments of the present invention based, at least partially, on their appreciation of at least one problem associated with the prior art designs of the preform 100.
  • Various features have been adopted in the prior art to strengthen the base portion of the final-shaped container. This has been done primarily for stability and/or rigidity of the final- shaped container, for example, such that it resists internal pressure caused by a carbonated drink against the bottom portion of the final-shaped container. It is known to provide a larger amount of resin, for example in a form of ribs, within the base region in order to provide for the stability and/or rigidity of the final-shaped container.
  • FIG. 2 depicts a perspective view of a preform 200, implemented in accordance with a non-limiting embodiment of the present invention.
  • the preform 200 consists of a neck portion 202, a gate portion 206 and a body portion 204 extending between the neck portion 202 and the gate portion 206.
  • the preform 200 has a number of additional structural features that fulfill one or more functions.
  • a thread 208 within the neck portion 202, there is provided a thread 208.
  • the purpose for the thread 208 is to cooperate with a complementary thread of a closure device (not depicted) to maintain a substance (such as a beverage and the like) maintained within a final- shaped container produced from the preform 200 (when such a final-shaped container is blow- molded and eventually filled with the substance).
  • the neck portion 202 comprises a support ledge 212.
  • the support ledge 212 performs multiple functions including, but not limited to, cooperating with various handling devices and structures during injection molding and blow molding stages of production of the preform 200 (for example, cooperation with guiding rails) and the final-shaped container from the preform 200 (for example, cooperation with the blow-molding equipment to provide sealing, etc.). It is noted that within the specific non-limiting illustration provided within Figure 2, the support ledge 212 is implemented in a "flower-shape" or "petaloid- shape" manner.
  • the gate portion 206 comprises a pattern of depressions 214 defined within an external surface thereof.
  • the pattern of depressions 214 includes a pattern of grooves 216.
  • the pattern of grooves 216 starts at a gate vestige 240 and extends outwardly. It is worthwhile noting that this needs not be so in every embodiment of the present invention and, as such, in alternative embodiments of the present invention the pattern of grooves 216 can start at a point remote from the gate vestige 240 and can extend outwardly from that point.
  • the width of the pattern of grooves 216 flares outwardly, starting from the gate vestige 240 moving towards the body portion 204. Within the illustration, this flaring out continues right towards a split line (not separately numbered) defined between the gate portion 206 and the body portion 204.
  • the number or the shape of some or all of the plurality of pattern of grooves 216 is not particularly limited and is generally considered to be an implementation consideration.
  • the pattern of grooves 216 may include grooves that can be longer or shorter, deeper or shallower, be of different shape, etc.
  • the number of the grooves within the pattern of grooves 216 may be different.
  • some of the grooves within the pattern of grooves 216 may include grooves that are implemented in a different form factor and/or length from others of the grooves within the pattern of grooves 216.
  • some or all of the grooves within the pattern of grooves 216 may include grooves that have an irregular profile.
  • the pattern of grooves 216 results in material being "taken out" from the gate portion 206 vis-a-vis the implementation of the gate portion 106 of Figure 1.
  • Inventor has performed a modeling exercise using CAD functionality to determine an example of weight savings.
  • the weight savings are estimated to be approximately 0.5 grams.
  • the pattern of depressions 214 results in creation of a pattern of protrusions 218.
  • construction of the gate portion 206 includes a given protrusion of the pattern of protrusions 218 disposed in- between two neighboring depressions of the pattern of depressions 214 and vice versa.
  • the pattern of protrusions 218 is associated with a first thickness that is substantially the same as a second thickness associated with the body portion 204.
  • the body portion 204 is associated with the substantially same second thickness along substantially the whole length thereof.
  • the pattern of depressions 214 is associated with a third thickness, which is smaller than the first thickness and the second thickness.
  • the result is definition of the pattern of protrusions 218 (by virtue of the pattern of depressions 214), while taking some material out by virtue of pattern of depressions 214, resulting in overall weight savings.
  • the preform 200 can be used for forming a final-shaped container having a petaloid base.
  • the preform 200 can be used for forming other types of final-shaped containers.
  • a technical effect of embodiments of the present invention (for example, when used for forming a final-shaped container having a petaloid base) includes providing more material (i.e. providing the first thickness of material associated with the pattern of protrusions 218), where higher stretch ratio is required, i.e. in the area where feet of the final-shaped container are to be defined and providing less material (i.e. providing a third thickness of material associated with the pattern of depressions 214), where lesser stretch ratio is required, i.e. where areas between feet of the final-shaped container are to be defined.
  • This results in ability to enjoy material weight savings, while still providing for stability and/or rigidity of the final-shaped container, where required.
  • the depth of the pattern of depressions 214 can be selected taking into account several considerations that include, but are not limited to: (a) cycle time considerations; (b) molding temperature or, in other words, temperature of the molding material; (c) type of the molding material used, such as it viscosity and/or its intrinsic viscosity, (d) available injection pressure; (e) surface of a molding stack that is used to define a molding cavity where the preform 200 is formed, and (f) desirable stretch ratio associated with the areas of the final- shaped container to be defined by the pattern of depressions 214.
  • one skilled in the art will be able to determine the depth of the pattern of depressions 214, while ensuring that a minimum wall thickness to enable molding material to flow by is maintained, while at the same time ensuring the strength of the final-shaped container manufactured from the preform 200, as defined by conventional tests (such as the top load test and/or burst resistance test and/or other tests that determine whether or not the final-shaped container meets some pre-determined characteristics).
  • the body portion 204 also comprises a body pattern of depressions 220, which are complementary in shape and location to the pattern of depressions 214, creating a "continuous pattern of depressions". It is noted that this needs not be so in every embodiment of the present invention.
  • the body pattern of depressions 220 can be omitted and in those embodiments of the present invention, the pattern of depressions 214 can terminate at a split line (not separately numbered) defined where the gate portion 206 meets the body portion 204.
  • the body pattern of depressions 220 can extend along some or the whole length of the body portion 204.
  • the gate portion 206 is generally associated with what is known as a substantially semispherical shape thereof. This needs not be so in every embodiment of the present invention.
  • An alternative implementation thereof will now be described in greater detail with reference to Figure 3, which depicts a perspective view of a preform 300 implemented in accordance with another non-limiting embodiment of the present invention.
  • the preform 300 consists of a neck portion 302, a gate portion 306 and a body portion 304 extending between the neck portion 302 and the gate portion 306.
  • the gate portion 306 is generally associated with a substantially conical shape.
  • preform 300 is implemented in substantially the same manner described above with reference to the preform 200 and, as such, this description will not be repeated herein.
  • Figure 4 depicts a perspective view of a preform 400, looking from the top inside of the preform 400, the preform 400 being implemented in accordance with another non-limiting
  • the gate portion 406 comprises a pattern of depressions 414 defined within the internal surface thereof.
  • the pattern of depressions 414 includes a pattern of grooves 416.
  • the pattern of grooves 416 starts at a gate vestige 440 and extends outwardly. It is worthwhile noting that this needs not be so in every embodiment of the present invention and, as such, in alternative embodiments of the present invention the pattern of depressions 414 can start at a point remote from the gate vestige 440 and can extend outwardly from that point.
  • the width of the pattern of grooves 416 flares outwardly, starting from the gate vestige 440 moving towards the body portion (not visible and not separately numbered). Within the illustration, this flaring continues right towards the split line between the gate portion 406 and the body portion, which is not visible and not separately numbered.
  • the number or the shape of some or all of the plurality of pattern of grooves 416 is not particularly limited and is generally considered to be an implementation consideration.
  • the pattern of grooves 416 may include grooves that can be longer or shorter, deeper or shallower, be of different shape, etc.
  • the number of the grooves within the pattern of grooves 416 may be different.
  • some of the grooves within the pattern of grooves 416 may include grooves that can be implemented in a different form factor and/or length from others of the grooves within the pattern of grooves 416.
  • some or all of the grooves within the pattern of grooves 416 may include grooves that have an irregular profile.
  • the pattern of grooves 416 results in material being "taken out” from the gate portion 406 vis-a-vis the implementation of the gate portion 106 of Figure 1.
  • Inventor has performed a modeling exercise using CAD functionality to determine an example of weight savings.
  • the weight savings are estimated to be approximately 0.3 grams (for a conical shape gate area implementation) and approximately 0.2 (for a semispherical shape gate area implementation).
  • the pattern of depressions 414 results in creation of a pattern of protrusions 418.
  • construction of the gate portion 406 includes a protrusion of the pattern of protrusions 418 disposed in-between two neighboring depressions of the pattern of depressions 414 and vice versa.
  • the pattern of protrusions 418 is associated with a first thickness that is substantially the same as a second thickness associated with the body portion 404.
  • the body portion 404 is associated with the substantially same second thickness along substantially the whole length thereof.
  • the pattern of depressions 414 is associated with a third thickness, which is smaller than the first thickness and the second thickness.
  • the first thickness and the second thickness are substantially the same and the third thickness of the pattern of depressions 414 is somewhat smaller, the result is definition of the pattern of protrusions 418 (by virtue of the pattern of depressions 414), while taking some material out by virtue of pattern of depressions 414, resulting in overall weight savings.
  • the preform 200, 300, 400 includes a pattern of depressions 214, 414 defined within one of an internal skin or an external skin of the gate portion 206, 306, 406.
  • a molding stack that can be used for implementing embodiments of the present invention.
  • the pattern of depressions 214 can be defined by a gate insert 502, a non-limiting embodiment of which is depicted in Figure 5 and Figure 6, in which Figure 5 depicts a perspective view thereof and Figure 6 depicts a cross section taken along a portion thereof.
  • the gate insert 502 comprises a body 503.
  • the body 503 defines a nozzle receptacle 504 configured to receive, in use, a nozzle (not depicted) of a hot runner (not depicted), for example.
  • the body 503 also defines a molding face 506 for defining, in use, at least a portion of the gate portion 206, 306.
  • the molding face 506 comprises a defining pattern 505.
  • the defining pattern comprises a pattern of forming protrusions 508 and a pattern of forming depressions 510.
  • the pattern of forming protrusions 508 and the pattern of forming depressions 510 are mirror images of the pattern of depressions 214 and the pattern of protrusions 218, respectively, the preform 200, for example.
  • a standard core (not depicted) is used. Accordingly, the depth of the pattern of forming protrusions 508 and the pattern of forming depressions 510 is so selected, such that the preform 200, 300 that is defined in use, is associated with the pattern of depressions 214 that has the aforementioned third thickness and the pattern of protrusions 218 that has the aforementioned first thickness, whereby the third thickness that is smaller than the aforementioned first thickness (and the aforementioned second thickness, associated respectively with the body portion 204, 304).
  • the body pattern of depressions 220 can be defined by a cavity insert 802 depicted with reference to Figure 8 and Figure 9, in which Figure 8 depicts a perspective view thereof and Figure 9 depicts a cross-sectional view thereof, taken a long a longitudinal axis thereof.
  • Cavity insert 802 comprises inter alia a molding face 804 for defining, in use, at least a portion of the body portion 204, 304.
  • the molding face 804 comprises a defining pattern 805.
  • the defining pattern 805 comprises a pattern of forming protrusions 808 and a pattern of forming depressions 810.
  • the pattern of forming protrusions 808 and the pattern of forming depressions 810 are mirror images of the pattern of depressions 814 and the pattern of protrusions 818, respectively.
  • the depth of the body pattern of depressions 220 can be selected in a similar manner to the depth of the pattern of forming protrusions 508 and the pattern of forming depressions 510 described above with reference to Figure 5 and Figure 6.
  • the pattern of depressions 414 can be defined on the internal surface of the gate portion 406; the pattern of depressions 414 can be defined by a core insert 702, a non-limiting embodiment of which is depicted in Figure 7.
  • the core insert 702 comprises a core body portion 703, configured for attachment, in use, to a core plate (not depicted), in a manner well-known to those of skill in the art.
  • the core insert 702 comprises a core body portion 703, configured for attachment, in use, to a core plate (not depicted), in a manner well-known to those of skill in the art.
  • the 702 further comprises a molding face 706, configured to define, in use, an inner surface of the preform 400.
  • the molding face 706 comprises a defining pattern 705.
  • the defining pattern 705 comprises a pattern of forming protrusions 708 and a pattern of forming depressions 710.
  • the pattern of forming protrusions 708 and the pattern of forming depressions 710 are mirror images of the pattern of depressions 414 and the pattern of protrusions 418, respectively.
  • a standard gate insert (not depicted) is used. Accordingly, the depth of the pattern of forming protrusions 708 and the pattern of forming depressions 710 is so selected, such that the preform 400 that is defined in use, is associated with the pattern of depressions 414 that has the aforementioned third thickness and the pattern of protrusions 418 that has the aforementioned first thickness, whereby the third thickness that is smaller than the aforementioned first thickness (and the aforementioned second thickness, associated respectively with the body portion 404).
  • the support ledge 212 can be implemented in a "flower- shape” or "petaloid-shape” manner, a method of orienting the preform 200, 300, 400 during stretch-blow molding procedure in accordance with a non- limiting embodiment of the present invention can be implemented.
  • the support ledge is dimensioned for the petals of the support ledge 212 to match the pattern of depressions 214 and the pattern of protrusions 218 in such a manner that by orienting the support ledge 212 during stretch-blow molding, the pattern of protrusions 218 is oriented where feet of the final-shaped container are to be defined and the pattern of depressions 214 is oriented where areas between feet are to be defined.
  • the method includes using the flower-shape design of the support ledge to orient the pattern of protrusions 218 and the pattern of depressions 214 during stretch-blow molding such that the pattern of protrusions 218 is oriented where feet of the final-shaped container are to be defined and the pattern of depressions 214 is oriented where areas between feet are to be defined.
  • Figure 10 depicts a non-limiting embodiment of a portion of a final-shaped container 1002 produced from the preform 200, 300, 400.
  • the portion depicted in Figure 10 is a base portion 1004 thereof.
  • the base portion 1004 comprises a plurality of feet 1006 and a plurality of areas between feet 1008 interdisposed therebetween.
  • the plurality of feet 1006 has been formed from the pattern of protrusions 218, 418; while the plurality of areas between feet 1008 has been formed from the pattern of depressions 214, 414.
  • a particular technical effect of embodiments of the present invention will be illustrated with references to Figure 1 1 and Figure 12.
  • Figure 1 1 depicts a bottom view of a final-shaped container 1 100, implemented in accordance with known designs and Figure 12 depicts a bottom view of the final-shaped container 1002.
  • a region 1 102 which comprises primarily amorphous material disposed between a plurality of feet and a plurality of areas between feet of this known design.
  • a region 1202 which comprises primarily amorphous material disposed between the plurality of feet 1006 and a plurality of areas between feet 1008.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

Selon les modes de réalisation de la présente invention, on obtient un préforme, une pile de moules pour la fabrication du préforme et un procédé d'orientation du préforme pendant le moulage soufflage. L'invention concerne un préforme (200, 300, 400) convenant à un moulage soufflage subséquent pour obtenir un contenant de forme finale (1002). Le préforme (200, 300, 400) comprend une partie collerette (202, 302, 402); une partie grille (206, 306, 406); et une partie corps (204, 304, 404) s'étendant entre la partie collerette (202, 302, 402) et la partie grille (206, 306, 406); la partie grille (206, 306, 406) comportant : un motif de dépressions (214, 414) et un motif de parties saillantes (218, 418) interposés entre ces éléments; le motif de parties saillantes (218, 418) étant associé à une première épaisseur, la partie corps (204, 304, 404) étant associée à une deuxième épaisseur le long sensiblement de toute la longueur de celle-ci et le motif de parties saillantes (218, 418) étant associé à une troisième épaisseur ; la première épaisseur étant sensiblement identique à la deuxième épaisseur et la troisième épaisseur étant plus petite que la deuxième épaisseur.
PCT/CA2009/001677 2008-12-18 2009-11-25 Préforme, pile de moules pour la fabrication du préforme et procédé d'orientation du préforme pendant le moulage soufflage WO2010069042A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13875208P 2008-12-18 2008-12-18
US61/138,752 2008-12-18

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WO2010069042A1 true WO2010069042A1 (fr) 2010-06-24

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3009246A1 (fr) * 2014-10-16 2016-04-20 Sidel Participations Préforme présentant une épaisseur variable autour d'un axe principal
US11717990B2 (en) * 2015-10-08 2023-08-08 Alpla Werke Alwin Lehner Gmbh & Co. Kg Preform for production of a plastic container in a stretch-blow-molding method
WO2024013097A1 (fr) 2022-07-13 2024-01-18 Mahir Aktas Préforme en matériau thermoplastique et dispositif et méthode de production d'une préforme

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5455088A (en) * 1991-12-24 1995-10-03 Constar Plastics Inc. Preform for continuous standing ring bottle
CA2624321A1 (fr) * 2005-10-20 2007-04-26 Husky Injection Molding Systems Ltd. Dispositif de refroidissement d'insert de moule

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5455088A (en) * 1991-12-24 1995-10-03 Constar Plastics Inc. Preform for continuous standing ring bottle
CA2624321A1 (fr) * 2005-10-20 2007-04-26 Husky Injection Molding Systems Ltd. Dispositif de refroidissement d'insert de moule

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3009246A1 (fr) * 2014-10-16 2016-04-20 Sidel Participations Préforme présentant une épaisseur variable autour d'un axe principal
US11717990B2 (en) * 2015-10-08 2023-08-08 Alpla Werke Alwin Lehner Gmbh & Co. Kg Preform for production of a plastic container in a stretch-blow-molding method
WO2024013097A1 (fr) 2022-07-13 2024-01-18 Mahir Aktas Préforme en matériau thermoplastique et dispositif et méthode de production d'une préforme
DE102022117474A1 (de) 2022-07-13 2024-01-18 Mahir Aktas Vorformling aus einem thermoplastischen Material sowie Vorrichtung und Verfahren zur Herstellung eines Vorformlings

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