WO2002062558A1 - Procede et dispositif de conception d"une preforme - Google Patents
Procede et dispositif de conception d"une preforme Download PDFInfo
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- WO2002062558A1 WO2002062558A1 PCT/JP2002/000948 JP0200948W WO02062558A1 WO 2002062558 A1 WO2002062558 A1 WO 2002062558A1 JP 0200948 W JP0200948 W JP 0200948W WO 02062558 A1 WO02062558 A1 WO 02062558A1
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- WIPO (PCT)
- Prior art keywords
- preform
- thickness distribution
- difference
- thickness
- target
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Classifications
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- 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
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3835—Designing moulds, e.g. using CAD-CAM
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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
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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
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
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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
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
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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
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
- B29C2949/0722—Preforms or parisons characterised by their configuration having variable wall thickness at neck portion
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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
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
- B29C2949/0724—Preforms or parisons characterised by their configuration having variable wall thickness at body portion
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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
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
- B29C2949/0725—Preforms or parisons characterised by their configuration having variable wall thickness at bottom portion
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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
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
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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
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
- B29C2949/0731—Preforms or parisons characterised by their configuration having variable diameter at neck portion
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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
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
- B29C2949/0733—Preforms or parisons characterised by their configuration having variable diameter at body portion
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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
- B29C2949/07—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
- B29C2949/0769—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the lip, i.e. very top of preform neck
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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
- B29C2949/07—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
- B29C2949/0776—Closure retaining means not containing threads
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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
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/081—Specified dimensions, e.g. values or ranges
- B29C2949/0811—Wall thickness
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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
- B29C2949/20—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
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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
- B29C2949/20—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
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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
- B29C2949/20—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
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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
- B29C2949/20—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
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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
- B29C2949/3024—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique
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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
- B29C2949/3032—Preforms or parisons made of several components having components being injected
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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
- 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
- B29C49/06—Injection blow-moulding
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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
- 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
- B29C49/42398—Simulation of the blow-moulding process
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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
- B29C49/42398—Simulation of the blow-moulding process
- B29C49/42402—Simulation of the shaping process
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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
Definitions
- the present invention is used for designing a plastic molded product.
- INDUSTRIAL APPLICABILITY The present invention is used for a plastic molding method by injection blow molding in which a molded preform is put into a blow mold and blown by inflating gas to inflate.
- the present invention is used for designing a mold in plastic molding.
- FIGS. 13A to 13C show these pro-molding processes.
- Figure 13A shows the extrusion process.
- FIG. 13B shows a non-stretched injection molding process.
- Figure 13C shows the stretch pro-molding process.
- extrusion blow molding for example, molten plastic is extruded into a mold, the mold is clamped, and gas is blown into the molten plastic to produce a product conforming to the internal shape of the mold.
- Injection pro-molding is a method in which a preform is preliminarily formed, and the preform is heated and temperature adjusted as necessary, and then confined and blown into a professional mold.
- the difference between the non-stretched injection molding of 2a) and the stretch molding of 2b) is that the former performs the molding of the preform by air only, The latter differs in that it is stretched in the longitudinal direction by a stretching rod and stretched in the transverse direction by blow air. Stretch blow molding is also called biaxial stretch blow molding.
- Patent No. 2 555 509 Patent No. 295 7 503
- Patent No. 2 555 509 Patent No. 295 7 503
- a patent application was filed for an invention that simulates the shape of the parison in extrusion molding and rationally designs the die and core for extruding the parison (Japanese Patent Application Laid-Open No. 2001-32221).
- the preform is formed by injection molding, and therefore has the advantage of being able to design the shape with high accuracy including the wall thickness compared to the extrusion blow-molded parison.
- it is generally difficult to predict the thickness of a molded product that has been subjected to blow molding at a later stage of the process, and if the thickness of the molded product is largely uneven, the strength of the molded product is reduced.
- uneven thickness of the molded product causes a large deformation after blow molding, especially when the molded product is taken out at a high temperature, and there is a problem that the stability of the molded product is deteriorated.
- the transverse stretching ratio, longitudinal stretching ratio and area ratio (surface area of molded product) / (Preform surface area) strongly affects the moldability.
- the mouth of the preform is usually the mouth of the target molded product (bottle)
- the preform diameter is determined by the diameter of the mouth of the target molded product.
- the longitudinal stretching ratio depends on the resin used, but it is generally 1 to 1.2 times in the case of non-stretching and 1.5 to 3 times in the case of stretch stretching.
- the thickness of the preform is around 3 mm (about 2 to 4 mm). As the thickness decreases, it becomes difficult to form the preform. When the wall thickness increases, the entire molding cycle becomes longer, and the blowing process becomes more difficult. Determine the thickness of the preform from the longitudinal stretching ratio and the target thickness after molding.
- the inner diameter of the preform is determined by the inner diameter of the mouth, but in reality, a slight draft is required to remove the mold inside the preform, and the actual preform is as shown in Fig. 15 Shape.
- the wall thickness may be fine-tuned as shown in Fig. 16 based on the resin used and the strength specifications of the target molded product. Changing the thickness distribution changes the outer shape, so the thickness distribution design and shape design have the same meaning. However, in the past, the design of the thickness distribution of the preform was only empirical, and it was not possible to determine whether or not the molded thickness distribution after the actual molding was appropriate without forming it.
- this preform using the finite element method, a simulation is performed using the total length h of the preform and the average body diameter d as design variables, and the maximum and minimum wall thicknesses of the molded product as a result of the simulation are determined.
- a technique has been proposed in which the preform is taken out to determine whether or not it is within an allowable range, and the overall height h of the preform or the range of the average body diameter d is determined (Japanese Patent Application Laid-Open No. 7-198585). ).
- this technology only changes the overall height of the preform]! And the average body diameter d.
- the molded product is a bottle
- the optimal preform shape cannot be obtained.
- the optimization of the total height h and the optimization of the average trunk diameter d are performed independently, there is a problem that an optimal solution cannot always be obtained.
- the present invention solves such a problem, and in injection molding, a preform design that can reduce the time, number, and cost required for design trial production to obtain an ideal preform shape. It aims to provide methods and equipment. Another object of the present invention is to provide an invention capable of reducing the time, man-hour, and cost of designing and producing an optimal preform mold. An object of the present invention is, in particular, to provide a design method and an apparatus capable of obtaining an optimal preform shape.
- a preform is molded using a preform molding die, and then put into a blow molding die to perform blow molding.
- the present invention is used for designing a preform molding die.
- a blow simulation is performed on the shape including the thickness distribution of the preform, the thickness distribution of the molded product after blow molding is calculated, and the thickness of the molded product calculated from the simulation is calculated.
- Compare the distribution and the thickness distribution of the target molded product change the shape of the preform based on the difference, and calculate the thickness distribution of the molded product from the shape of the preform until the difference falls within the threshold range. It is characterized by reducing the man-hours, time, and cost required for designing and producing an optimal preform by repeating the process of comparing the thickness distribution and changing the shape of the preform.
- the simulation is performed by repeatedly changing the thickness distribution of the preform until the difference between the thickness distribution of the preform and the target thickness converges to the threshold value or less, an optimal preform shape can be obtained. it can.
- the thickness of each node is determined by the finite element method and compared with the target thickness, so that the optimal preform shape for the entire shape of the molded product can be obtained.
- a first aspect of the present invention is a method for designing a preform, comprising: a first step of calculating a thickness distribution of a molded article based on an initial shape of the preform; A second step of calculating a difference between the thickness distribution and the target thickness distribution, a third step of comparing the difference with a threshold, and the difference exceeding the threshold. A step of changing the initial shape of the preform based on the difference, and executing the steps from the first step to the fourth step until the difference falls below a threshold.
- the target thickness distribution is set in advance for the molded product, the thickness distribution of the discrete nodes of the preform is input so that the total weight matches the target thickness distribution, the blowing simulation is executed, and the obtained molding is performed. Compare the wall thickness at the node of the product with the target wall thickness at the corresponding position, change the wall thickness distribution of the preform nodes from this difference, and repeat the above procedure until the difference at each node falls below the threshold. Can be implemented.
- the setting of the target thickness distribution of a molded article is performed by, for example, discretizing the molded article and assigning a thickness to each point.
- each point of the discretized molded product does not generally correspond to the node of the molded product obtained by simulation.
- the nodes of the preform are formed by discretely shaping the shape inside the preform, and the outside of the nodes is given a thickness to form the outer shape of the preform.
- a preform designing apparatus comprising: means for accumulating an initial shape of an input preform as three-dimensional information; and a thickness distribution of a molded article based on the initial shape of the preform.
- a fifth means for repeatedly executing the above.
- the storing means information on the target thickness distribution is previously stored in the molded article, and the first means is a discrete node of the preform so that the total weight of the target molded article matches.
- a third aspect of the present invention is a program which, when installed in a combination device in which basic software is installed, allows the computer device to execute each of the above means.
- FIG. 1 is a block diagram of a main part of a molding preform designing apparatus according to an embodiment of the present invention.
- FIG. 2 is a diagram showing a method for designing a preform for molding according to the present invention.
- FIG. 3 is a flowchart showing a preform shape design procedure of the present invention.
- FIG. 4 is a flowchart showing a procedure for setting conditions of the temperature control step of the present invention.
- Fig. 5 is a flowchart showing the procedure of blow mold design.
- FIG. 6 is a view showing a preform cross-sectional shape.
- Figure 7 is a diagram showing the inside shape of the preform.
- Figure 8 shows the inside shape of the molded product.
- Figure 9 is a diagram showing the thickness design procedure focusing on node i.
- FIG. 10 shows a preform heating model
- Figure 11 is a diagram showing the outer diameter of the preform model and the distance from the center axis of the position of interest.
- Figure 12 shows the concept of radiation intensity.
- Figure 13 shows the classification of blow molding methods.
- FIG. 14 is a view for explaining the draw ratio.
- FIG. 15 is a diagram showing a cross-sectional shape of a preform having a draft angle.
- FIG. 16 is a diagram showing a cross-sectional shape of a preform in which a thickness distribution is finely adjusted.
- FIG. 1 is a block diagram of a preform designing apparatus.
- FIG. 2 is a diagram showing a procedure for designing a preform.
- FIG. 3 is a flowchart showing the procedure for designing the shape of the preform.
- Figure 4 is a flowchart showing the procedure for setting the conditions of the temperature control process. It is.
- FIG. 5 is a flowchart showing a blow mold design procedure.
- the preform designing apparatus includes an input unit 1 for inputting an initial shape of a preform including a thickness distribution as three-dimensional information, and the preform in a mold.
- a simulation execution unit 2 that calculates a deformation simulation (injection simulation) of the deformation when gas is blown, and the thickness distribution of the molded product and the target molded product as a result of the calculation of the deformation simulation.
- a difference calculating unit 3 for calculating a difference between the difference and a threshold value; and a design changing unit 5 for changing the thickness distribution of the preform based on the difference when the difference exceeds the threshold value.
- the simulation execution unit 2, the difference calculation unit 3, the comparison unit 4, and the design change unit 5 are repeatedly executed until the difference falls below the threshold value. That.
- the preform designing apparatus uses a computer device.
- a program that is a device corresponding to the preform designing apparatus according to the present invention is a combination program in which basic software (OS, operating system) is installed. This can be realized by installing it on a user device.
- This program can be recorded on a recording medium and installed, or can be installed via a communication line.
- the operation of the preform designing apparatus will be described along the process of forming the inlet and outlet.
- a simulation is performed to compare the difference with the thickness distribution of the target molded product, and the preform shape (thickness distribution) is determined.
- the feature is that the number of steps involved in the design of the preform mold shape is minimized and the optimal preform shape is obtained by repeatedly converging the loop of changing the shape of the preform.
- the design order is as follows: the preform temperature distribution is given, the preform shape (thickness distribution) is designed by blow analysis, and the temperature distribution that approximates the given preform temperature distribution is determined.
- Preform heating conditions and cooling to be realized The conditions are determined by heating-cooling analysis.
- the preform blowing analysis was performed again based on the preform temperature distribution obtained under the set heating and cooling conditions, and if it was necessary to change the preform molding die, the preform molding metal was changed. Change the type.
- the temperature distribution of the preform may be obtained from experiments, and the heating-cooling analysis may be omitted.
- the blow analysis it is necessary to give the physical property values in consideration of the temperature distribution of the preform. Desirably, the temperature dependence of the physical property values is taken into account, and the analysis taking into account the temperature change over time should be performed.
- the simulation execution unit 2 performs injection analysis as shown in FIG.
- the result of this analysis is input to the difference calculation unit 3, and the thickness difference from the target molded product shape is calculated.
- This difference is input to the comparison unit 4 and compared with the threshold value. If the difference is larger than the threshold value, the design change unit 5 changes the shape (thickness distribution) of the preform based on the difference.
- the inner shape of the preform is determined from the inner diameter of the target molded product and the draft, and is discretized at each node. Each node is given a thickness toward the outside of the preform to obtain the outside shape of the preform. Injection stains are applied to this preform shape.
- the inner diameter of the preform is the same as the inner diameter of the mouth of the target molded product (bottle).
- the longitudinal stretching ratio depends on the resin used, but it is 1 to 1.2 times in the case of non-stretching (the height of the preform is about 0.8 to 1 times the height of the target molded product).
- the target In the case of blow molding, the target is 1.5 to 3 times (the height of the preform is about 0.3 to 0.7 times the target molded product height).
- the thickness of the preform can be about 3 mm as in the past, but in the present invention, if the shape and strength specifications of the target molded product are almost the same as those designed in the past, then Stored design data
- the design (calculation) can be started by setting the initial shape of the preform with reference to the inner diameter, shape and thickness of the reform. Giving the thickness distribution of the preform gives the shape of the preform.
- the preform temperature distribution is changed depending on the heating conditions. As shown in Fig. 4, when the preform shape (thickness distribution), the heat intensity and the arrangement of the heat shield are input to the simulation execution unit 2 via the input unit 1, the temperature distribution of the preform is obtained. Decided.
- the heat shield is provided between the heater and the preform and shields radiant heat from the heater and is used for adjusting the temperature distribution.
- an aluminum rod was used in accordance with Japanese Patent Application Laid-Open No. H11-128780.
- the simulation execution unit 2 performs a heating-cooling analysis and calculates a preform temperature distribution. This preform temperature distribution is input to the comparison unit 4 (broken line in FIG. 1) and compared with the set temperature distribution. According to the comparison result, the heat intensity and the arrangement of the heat shield are changed.
- the preform shape (thickness distribution) is changed and the heating conditions are set.
- the shape of the mold is changed by the method disclosed in the prior invention, Japanese Patent No. 2,595,509 and Japanese Patent No. 2,957,503. Do. That is, as shown in Fig.
- the simulation execution unit 2 performs the cooling-thermal deformation analysis based on this, and the professional mold
- the shape of the molded product after being taken out of the mold is calculated to obtain a difference from the target shape, and the design change unit 5 changes the blow mold shape based on the difference.
- FIG. 7 shows the inner shape of the preform.
- Figure 8 shows the inside shape of the molded product.
- the thickness design procedure will be described focusing on node i.
- Hi (k + 1) Hi (k)-(H average / h average ) A i (k) or
- a f a-(H average / h average )
- Hi (k + 1) Hi (k) -a 'Ahi (k)
- the thickness Hi (k + 1) is corrected so that the total weight of the preform matches the total weight of the target molded product.
- the operation is repeated until the difference Ahi (k) becomes less than the threshold.
- the same threshold value is used for all nodes i.
- a different value may be used for each node.
- a preform thermal analysis example is shown. As shown in Fig. 10, a preform heating model is set. In the example of Fig. 10, the preform shape is a cylinder, the sun is represented by an infinitely long line, and a reflector is provided on the floor. Using this model, the radiant heat per unit time and unit area received by the preform surface is calculated.
- R is the outer diameter of the preform
- r is the distance from the center axis of the position of interest under the boundary conditions.
- T temperature
- t time
- density density
- thermal conductivity c
- a simple thermal analysis of the preform can be performed by combining the above-described preform heating with preform heat absorption and thermal diffusion.
- the present invention it is possible to accurately design and prototype a preform shape in a manufacturing process of injection blow molding, and reduce the man-hour, time, and cost required for designing and prototype of a preform mold. be able to. Further, according to the present invention, it is possible to design an optimal preform shape in injection blow molding, so that it is possible to provide a design apparatus that further reduces the burden on the designer.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02711320A EP1366887A4 (en) | 2001-02-06 | 2002-02-06 | METHOD AND DEVICE FOR DESIGNING A PREFORM |
US10/467,268 US20050033562A1 (en) | 2001-02-06 | 2002-02-06 | Method and device for design of preform |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001030029 | 2001-02-06 | ||
JP2001-030029 | 2001-02-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002062558A1 true WO2002062558A1 (fr) | 2002-08-15 |
Family
ID=18894297
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/000948 WO2002062558A1 (fr) | 2001-02-06 | 2002-02-06 | Procede et dispositif de conception d"une preforme |
Country Status (5)
Country | Link |
---|---|
US (1) | US20050033562A1 (ja) |
EP (1) | EP1366887A4 (ja) |
CN (1) | CN1455729A (ja) |
TW (1) | TW564218B (ja) |
WO (1) | WO2002062558A1 (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5045525B2 (ja) * | 2008-03-31 | 2012-10-10 | 富士通株式会社 | 設計支援システム、設計支援方法および設計支援プログラム |
EP2539130B1 (en) * | 2010-02-26 | 2015-04-22 | Husky Injection Molding Systems Ltd. | A preform suitable for blow-molding into a final shaped container |
JP5335028B2 (ja) | 2011-05-25 | 2013-11-06 | サントリーホールディングス株式会社 | 樹脂製ボトルの製造方法 |
KR102111365B1 (ko) * | 2013-05-27 | 2020-05-18 | 한국과학기술원 | 임펄스 시간 분배를 이용한 섭동 입력성형기 설계방법 |
CN107775942A (zh) * | 2016-08-31 | 2018-03-09 | 岱纳包装(天津)有限公司 | 一种基于3d扫描的挤出胶胚自动调整和控制挤出吹塑的方法 |
EP3733301A4 (en) * | 2017-12-25 | 2021-09-01 | Suntory Holdings Limited | PREFORM COATING DEVICE |
EP3814093B1 (en) * | 2018-06-29 | 2024-02-07 | Discma AG | Free blow bottle design |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05169520A (ja) * | 1991-12-25 | 1993-07-09 | Sekisui Chem Co Ltd | ブロー成形または真空成形における成形プロセス解析方法 |
JPH07108595A (ja) * | 1993-10-15 | 1995-04-25 | Denki Kagaku Kogyo Kk | ブロー成形解析によるプリフォーム又はパリソン形状の設計方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4751651A (en) * | 1983-08-16 | 1988-06-14 | Phillips Petroleum Company | Shaping of dies |
US4755404A (en) * | 1986-05-30 | 1988-07-05 | Continental Pet Technologies, Inc. | Refillable polyester beverage bottle and preform for forming same |
JP3501486B2 (ja) * | 1993-12-27 | 2004-03-02 | キヤノン株式会社 | 射出成形品の変形量予測方法及びその装置 |
-
2002
- 2002-02-06 CN CN02800221A patent/CN1455729A/zh active Pending
- 2002-02-06 TW TW91102096A patent/TW564218B/zh not_active IP Right Cessation
- 2002-02-06 WO PCT/JP2002/000948 patent/WO2002062558A1/ja not_active Application Discontinuation
- 2002-02-06 US US10/467,268 patent/US20050033562A1/en not_active Abandoned
- 2002-02-06 EP EP02711320A patent/EP1366887A4/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05169520A (ja) * | 1991-12-25 | 1993-07-09 | Sekisui Chem Co Ltd | ブロー成形または真空成形における成形プロセス解析方法 |
JPH07108595A (ja) * | 1993-10-15 | 1995-04-25 | Denki Kagaku Kogyo Kk | ブロー成形解析によるプリフォーム又はパリソン形状の設計方法 |
Non-Patent Citations (2)
Title |
---|
See also references of EP1366887A4 * |
YOSHIKAWA HIDEO: "Jitsuyoteki blow seikei. Netsuseikei kaiseki program", PLASTICS, vol. 51, no. 3, 1 March 2000 (2000-03-01), pages 36 - 40, XP002951861 * |
Also Published As
Publication number | Publication date |
---|---|
US20050033562A1 (en) | 2005-02-10 |
TW564218B (en) | 2003-12-01 |
EP1366887A1 (en) | 2003-12-03 |
CN1455729A (zh) | 2003-11-12 |
EP1366887A4 (en) | 2004-10-27 |
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