WO2002032651A1 - Parison and blow molding method for bottle having undercut - Google Patents
Parison and blow molding method for bottle having undercut Download PDFInfo
- Publication number
- WO2002032651A1 WO2002032651A1 PCT/US2000/041282 US0041282W WO0232651A1 WO 2002032651 A1 WO2002032651 A1 WO 2002032651A1 US 0041282 W US0041282 W US 0041282W WO 0232651 A1 WO0232651 A1 WO 0232651A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- parison
- wall
- thickness
- body portion
- lower body
- Prior art date
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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
- 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
-
- 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
- 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
- B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow 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
- 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
- B29C49/48—Moulds
- B29C2049/4879—Moulds characterised by mould configurations
- B29C2049/4882—Mould cavity geometry
- B29C2049/48825—Asymmetric moulds, i.e. the parison is not in the center of the mould
-
- 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
- B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
- B29C2949/0721—Tangentially varying 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
- B29C2949/076—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
-
- 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
- B29C2949/0817—Wall thickness of the body
-
- 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
- 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
- B29C49/4205—Handling means, e.g. transfer, loading or discharging means
- B29C49/42073—Grippers
- B29C49/42085—Grippers holding inside the neck
-
- 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
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6409—Thermal conditioning of preforms
- B29C49/6427—Cooling of preforms
-
- 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
-
- 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
Definitions
- the invention relates to blow molding, and more specifically to a method for blow molding a bottle with an undercut shape and a parison used in the blow molding of a bottle with an undercut shape.
- Injection blow molding comprises the steps of first producing an intermediate resin article having a shape similar to that of the final resin article.
- This intermediate resin article is often referred to as the parison, or preform.
- the parison is usually formed by an injection molding process whereby molten resin is forced into a cavity defined by the space between a moveable core rod and the parison mold into which the core rod is placed. Once the injection molding part is complete, the thus-formed parison is transferred from the parison mold to the blow mold via the moveable core rod on which it rests. The parison is next transferred, via the core rod, to the blow mold.
- the longitudinal axis of the core rod is generally parallel to the plane of separation of the blow mold halves.
- the blow mold cavity has the shape of the outside of the final bottle product.
- the parison is then inflated, often through the introduction of air through the core rod, and caused to expand to the shape of the blow mold.
- the final product wall thickness is less than the wall thickness of the parison.
- the blow mold is typically comprised of two halves, each of which moves in a substantially opposite direction with respect to the other.
- the contact area where the two mold halves meet and later part (after the blowing is complete) is usually called the parting line.
- the parting line is usually substantially parallel to the longitudinal axis of the core rod.
- special product shapes are desired, however, it is sometimes necessary to have a parting line that is not linear or completely parallel to the core rod axis.
- special bottle shapes are desired, and thus the parting line is not linear, it becomes important to insure that the core rod can be both transferred into the location between the open blow mold halves and removed from the same position with the blown bottle in place on the core rod. Because of conventional machinery, it is equally important is that the blown bottle be able to be stripped from the core rod in a direction parallel to the longitudinal axis of the core rod.
- the parison be positioned in (or as close as possible to) the geometric center of the blow mold cavity. Where the parison is not in the middle of the blow mold cavity, the distance that the molten plastic comprising the parison must travel when blown is greater in some parts of the mold than in others. This incongruity in the distance stretched results in a bottle having varying wall thickness in its different regions.
- the present invention provides both a method and a device for the blow mold production of a bottle having an undercut surface and an off-center vertical axis.
- the method involves the blow molding of a container having a substantially constant wall thickness, but having an oblong base, a round top edge defining a round opening, the round top edge defining a plane which is not parallel to the plane of the base, a neck portion disposed at the same angle as the plane defined by the top edge, a front outer surface, and a rear outer surface having a lower portion and an upper portion.
- the method comprises the steps of forming a parison having a cylindrical upper neck portion having a cavity extending therethrough, the upper neck having a top surface edge defining a top plane.
- the parison has a hollow, elongated lower body portion having a closed lower end and an upper end, the lower body portion having a major axis extending in a direction parallel to the longitudinal axis of the cylindrical upper neck portion.
- the parison also has a front wall and a rear wall, the closed lower end defining a plane which is parallel to the top plane defined by the top surface edge.
- Below the top is a transition region connecting the upper neck portion and the lower body portion, the transition region having a top end with the same cross section as the cylindrical upper neck portion and a lower end with the same cross section as the upper end of the lower body portion.
- the front wall is thicker than the rear wall.
- the invention also comprises the parison itself.
- the parison of the invention has a first wall a first distance from the blow mold inner surface and a second wall a second distance from the inner surface. The first distance is less than the second distance and the first wall is thinner than the second wall.
- the parison comprises a cylindrical upper neck portion having a cavity extending therethrough, the upper neck having a top surface edge defining a top plane.
- the parison also has a hollow, elongated lower body portion having a closed lower end and an upper end, the lower body portion having a major axis extending in a direction parallel to the longitudinal axis of the cylindrical upper neck portion.
- the lower body portion has a front wall and a rear wall and a closed lower end defining a plane which is parallel to the top plane defined by the top surface edge.
- the parison also has a transition region connecting the upper neck portion and the lower body portion, the transition region having a top end with the same cross section as the cylindrical upper neck portion and a lower end with the same cross section as the upper end of the lower body portion.
- the transition region has a sloped wall extending from the rear wall of the lower body portion out and up from the rear wall of the lower body portion to the upper neck portion.
- the front wall is thicker than the rear wall.
- FIG. 1 is a schematic view of a bottle blow molded in accordance with the present invention
- FIG. 2 is a schematic view of a blow mold which would not work with typical core rod handling apparati
- FIG. 3 is a cross-sectional sideview of a parison mold according to the present invention.
- FIG. 4 is top view of the bottom half of the parison mold of FIG. 3;
- FIG. 4 A shows an isometric view of a parison mold bottom half;
- FIG. 5 is a cross-sectional sideview of the parison mold of FIG. 3 with a core rod in place;
- FIG. 6 is a cross-sectional sideview of the parison mold of FIG. 3 with a core rod inserted and a resin injection nozzle in place;
- FIG. 6 A is a cross-sectional sideview of the apparatus of FIG. 6 showing the injection of resin to form the parison;
- FIG. 7 is a cross-sectional sideview of a blow mold according to the present invention.
- FIG. 7 A shows an isometric view of a blow mold bottom half
- FIG. 8 is a top view of the bottom half of the blow mold of FIG. 7;
- FIG. 9 is a bottom view of the top half of the blow mold of FIG. 7;
- FIG. 10 is a cross-sectional sideview of the blow mold of FIG. 7 with a core rod and parison disposed therein;
- FIG. 11 is a schematic sideview of a core rod and parison disposed within a blow mold according to the present invention.
- FIGs. 11 A and 1 IB are sections taken from FIG. 11 ; and FIGs. 12A and 12B are the sections of FIGs. 11A and 11B, respectively, with dimensions indicated thereon.
- FIG. 1 shows one example of the type of bottle 100 having an undercut region 110 which can be produced through a blow molding process according to the present invention.
- this type of bottle was typically made through an extrusion molding process because its shape presented several problems to conventional blow-molding techniques.
- FIG. 2 shows a mold shape which would provide product bottle 100 of FIG. 1.
- the parison shape for a bottle of constant wall thickness has itself a constant wall thickness.
- a parison is then inserted into the geographic center (or near geographic center) of the blow mold to insure consistent wall thickness.
- this parison would have to be oriented approximately as shown in FIG. 2, with core rod 200 and parison 210 in place within the near geographic center of the mold.
- core rod 200 and parison 210 in place within the near geographic center of the mold.
- the problem with this requirement is that conventional processing machinery strips the product bottle from the core rod in a direction parallel to the longitudinal axis of the core rod.
- the resultant blown bottle of FIG. 2 cannot be stripped from the core rod in a direction parallel to the axis of the core rod because the front part of the bottle blocks its removal.
- the parison used in the present invention has varying wall thickness along its different sides which overcome the need for the parison to be present in the physical middle of the blow mold.
- the use of this novel parison allows undercut bottles of the type shown in FIG. 1 to be blow molded, whereas in the past extrusion molding would likely have been used.
- FIG. 3 shows a cross-sectional sideview of the parison mold according to the present invention.
- FIG. 3 shows parison mold 305 with parison mold top half 300 and parison mold bottom half 310 which come together along non-linear parting line 320 to form parison mold cavity 330.
- FIG. 4 shows a top view of parison mold bottom half 310 having cavity 450.
- FIG. 4A shows an isometric view of the bottom half 310.
- FIG. 5 shows a schematic view of the cross-sectional sideview of parison mold 305 shown in FIG. 3 with core rod 500 oriented between mold halves 300 and 310.
- both core rod 500 and top mold half 300 move toward mold half 310 as shown by the arrows in FIG. 5.
- all three components could move as the mold closes.
- FIG. 6 shows core rod 500 in place within parison mold cavity 330. Also shown schematically is resin injection nozzle 600 which delivers resin into parison mold cavity 330.
- FIG. 6A shows the space defined between core rod 500 and parison mold cavity 330 being filled with resin to form a parison. As will be discussed more fully below, core rod 500 with its partially cooled resin will be moved to the blow mold cavity.
- FIG. 7 shows a cross-sectional sideview of a blow mold 705 that can be used in the present invention.
- Blow mold top half 700 contacts blow mold bottom half 710 along blow mold parting line 720 to form blow mold cavity 730.
- FIG. 7A shows an isometric view of blow mold bottom half 710.
- FIG. 8 shows a top view of blow mold bottom half 710 having cavity 810;
- FIG. 9 shows a bottom view of blow mold top half 700 having cavity 910.
- FIG. 10 illustrates a schematic cross-sectional side view of blow mold 705 shown in FIG. 7, with core rod 500 and parison 610 disposed within blow mold cavity 720.
- the parison is ready to be blown, according to known practices, and air is injected through a small passageway within core rod 500 (not shown) which blows the parison outward against the blow mold inner wall.
- FIG. 11 shows a more detailed view of a parison 110 disposed on core rod 120.
- parison 110 comprises a cylindrical upper neck portion 140 having a cavity extending therethrough.
- Upper neck portion 140 has a top surface edge 145 defining a top plane, a hollow, elongated lower body portion 150 having a closed lower end 155 and an upper end 160.
- Lower body portion 150 has a major axis extending in a direction parallel to the longitudinal axis of the cylindrical upper neck portion 140, and has a front wall 170 and a rear wall 175. Closed lower end 155 defines a plane which is parallel to the top plane defined by the top surface edge 145. Also shown in FIG.
- Transition region 180 connecting upper neck portion 140 and lower body portion 150.
- Transition region 180 has a top end 181 with the same cross section as the cylindrical upper neck portion 140 and a lower end 182 with the same cross section as the upper end 160 of lower body portion 150.
- Transition region 180 has a sloped wall extending from rear wall 175 of lower body portion 150 out and up from rear wall 175 to upper neck portion 140.
- FIG. 11A shows a cross-section of lower body portion 150 near upper end 160.
- FIG. 11B shows a cross- section of lower body portion 150 toward the closed lower end 155.
- FIG. llA shows the cross-section where the distance from the parison to the blow mold wall is approximately the same on either side of the parison.
- FIG. 11B shows the cross-section where the distance from the parison to the blow mold wall is much greater on front wall 170 of the parison than on rear wall 175. Where the distance is greater, the thickness of the parison itself is also greater.
- FIGs. 12A and 12B illustrate a preferred embodiment of the parison shown in FIG. 11.
- x about 0.08 inches ("about” meaning +/- 0.01 inches, in all cases herein unless otherwise noted)
- y about 0.07 inches.
- x' about 0. 17 inches
- y' about 0.07 inches. Also illustrated in FIGs.
- 11 and 12 is the fact that along front wall 170 of the parison the wall thickness is tapered from closed lower end 155 having a first thickness up to a thickest central portion and down to a second thickness at the transition region.
- the parison wall thickness is about equal to the parison wall thickness at the upper end 160 of lower body portion 150. This is because the distance that the material comprising the parison at that point must travel during blowing is about the same.
- This parison also relates to a novel method of blow molding a container having an undercut shape. More specifically, the method according to the present invention provides a bottle having an undercut shape having a substantially constant wall thickness.
- the bottle also has a base, a round top edge defining a round opening, the round top edge defining a plane which is not parallel to the plane of the base, a neck portion disposed at the same angle as the plane defined by the top edge, a front outer surface, and a rear outer surface having a lower portion and an upper portion.
- the method used to blow mold such a bottle comprises the steps of first forming a particular parison, as discussed above, and then blowing the parison in a blow mold.
- the parison has a first wall which is a first distance from the blow mold inner surface and a second wall which is a second distance from the inner surface of the blow mold.
- the first distance is less than the second distance and the first wall is thinner over most of its length than the second wall.
- the method uses a parison where the front wall is about 2.5 times thicker at its thickest point than the rear wall.
- This aspect of the invention is important as the material along the front wall must travel much farther during blowing, and thus is stretched to a much greater extent, than the material comprising the rear wall of the parison.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2115001A AU2115001A (en) | 2000-10-19 | 2000-10-19 | Parison and blow molding method for bottle having undercut |
AU2001221150A AU2001221150B2 (en) | 2000-10-19 | 2000-10-19 | Parison and blow molding method for bottle having undercut |
EP00984548A EP1337391A4 (en) | 2000-10-19 | 2000-10-19 | Parison and blow molding method for bottle having undercut |
PCT/US2000/041282 WO2002032651A1 (en) | 2000-10-19 | 2000-10-19 | Parison and blow molding method for bottle having undercut |
MXPA02012179A MXPA02012179A (en) | 2000-10-19 | 2000-10-19 | Parison and blow molding method for bottle having undercut. |
CA002408169A CA2408169C (en) | 2000-10-19 | 2000-10-19 | Parison and blow molding method for bottle having undercut |
US10/297,905 US6872354B1 (en) | 2000-10-19 | 2000-10-19 | Parison and blow molding method for bottle having undercut |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2000/041282 WO2002032651A1 (en) | 2000-10-19 | 2000-10-19 | Parison and blow molding method for bottle having undercut |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002032651A1 true WO2002032651A1 (en) | 2002-04-25 |
Family
ID=21742154
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/041282 WO2002032651A1 (en) | 2000-10-19 | 2000-10-19 | Parison and blow molding method for bottle having undercut |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1337391A4 (en) |
AU (2) | AU2001221150B2 (en) |
CA (1) | CA2408169C (en) |
MX (1) | MXPA02012179A (en) |
WO (1) | WO2002032651A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7606786B2 (en) | 2002-08-16 | 2009-10-20 | Heidelberger Druckmaschinen Ag | Method and device for simulating process flows in the graphic industry |
WO2017020116A1 (en) | 2015-07-31 | 2017-02-09 | Husky Injection Molding Systems Ltd. | A preform, a mold stack for producing the preform, and a preform handling apparatus for handling the preform |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4054629A (en) * | 1976-01-22 | 1977-10-18 | American Can Company | Transfer blow molding technique |
US5346665A (en) * | 1990-12-19 | 1994-09-13 | Mazda Motor Corporation | Method of blow molding and blow molding system |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS594292B2 (en) * | 1978-09-28 | 1984-01-28 | 固 青木 | Injection blow molding method for flat containers |
FR2446163A1 (en) * | 1979-01-10 | 1980-08-08 | Oreal | Injection-blow moulding containers with a relatively narrow neck - by using a sealed base to conceal the other end of the parison form |
JPS55107430A (en) * | 1979-02-09 | 1980-08-18 | Yoshino Kogyosho Co Ltd | Forming method of bottle with handle made of plastic |
FR2628677B1 (en) * | 1988-03-15 | 1990-08-17 | Kerplas Snc | PUNCH FOR INJECTION-BLOWING OF AN INCLINED COLLAR BOTTLE |
EP0361141B1 (en) * | 1988-09-06 | 1995-08-09 | Dai Nippon Insatsu Kabushiki Kaisha | Stretch blow molding method for manufacturing an expanded bottle, a parison deforming mold for deforming or curving a stretch parison, and a stretch blow molded bottle |
JP3924082B2 (en) * | 1998-10-22 | 2007-06-06 | 大成化工株式会社 | Method for producing flat bottle by cold parison blow molding method, and parison for cold parison blow molding |
-
2000
- 2000-10-19 CA CA002408169A patent/CA2408169C/en not_active Expired - Fee Related
- 2000-10-19 MX MXPA02012179A patent/MXPA02012179A/en active IP Right Grant
- 2000-10-19 AU AU2001221150A patent/AU2001221150B2/en not_active Ceased
- 2000-10-19 WO PCT/US2000/041282 patent/WO2002032651A1/en active Application Filing
- 2000-10-19 AU AU2115001A patent/AU2115001A/en active Pending
- 2000-10-19 EP EP00984548A patent/EP1337391A4/en not_active Withdrawn
Patent Citations (2)
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US4054629A (en) * | 1976-01-22 | 1977-10-18 | American Can Company | Transfer blow molding technique |
US5346665A (en) * | 1990-12-19 | 1994-09-13 | Mazda Motor Corporation | Method of blow molding and blow molding system |
Non-Patent Citations (1)
Title |
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See also references of EP1337391A4 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7606786B2 (en) | 2002-08-16 | 2009-10-20 | Heidelberger Druckmaschinen Ag | Method and device for simulating process flows in the graphic industry |
WO2017020116A1 (en) | 2015-07-31 | 2017-02-09 | Husky Injection Molding Systems Ltd. | A preform, a mold stack for producing the preform, and a preform handling apparatus for handling the preform |
EP3328604A4 (en) * | 2015-07-31 | 2019-07-24 | Husky Injection Molding Systems Luxembourg IP Development S.à.r.l | A preform, a mold stack for producing the preform, and a preform handling apparatus for handling the preform |
US11186013B2 (en) | 2015-07-31 | 2021-11-30 | Husky Injection Molding Systems Ltd. | Preform, a mold stack for producing the preform, and a preform handling apparatus for handling the preform |
Also Published As
Publication number | Publication date |
---|---|
AU2115001A (en) | 2002-04-29 |
CA2408169C (en) | 2008-06-10 |
MXPA02012179A (en) | 2003-04-25 |
EP1337391A4 (en) | 2005-05-25 |
AU2001221150B2 (en) | 2006-06-29 |
CA2408169A1 (en) | 2002-04-25 |
EP1337391A1 (en) | 2003-08-27 |
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