WO2009117805A1 - A preform and a mold stack for producing the preform - Google Patents
A preform and a mold stack for producing the preform Download PDFInfo
- Publication number
- WO2009117805A1 WO2009117805A1 PCT/CA2009/000153 CA2009000153W WO2009117805A1 WO 2009117805 A1 WO2009117805 A1 WO 2009117805A1 CA 2009000153 W CA2009000153 W CA 2009000153W WO 2009117805 A1 WO2009117805 A1 WO 2009117805A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- preform
- support ledge
- protrusions
- neck portion
- contacting surface
- 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
- 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
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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
- 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
- B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
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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
- 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
- B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
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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
- 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
- B29C2949/073—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
- B29C2949/076—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
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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
- B29C2949/0777—Tamper-evident band retaining ring
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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
- B29C2949/0778—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the flange
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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
- 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
- B29C45/2618—Moulds having screw-threaded mould walls
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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
- 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
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/04—Polyesters derived from hydroxycarboxylic acids
- B29K2067/046—PLA, i.e. polylactic acid or polylactide
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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 generally relates to, but is not limited to, a molding systems and processes, and more specifically the present invention relates to, but is not limited to, a preform and a mold stack for producing the preform.
- 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.
- a molded article that can be formed, for example, from polyethylene terephthalate (PET) material is a preform that is capable of being subsequently blow-molded into a beverage container, such as, a bottle and the like.
- PET polyethylene terephthalate
- injection molding of PET material involves heating the PET material (ex. PET pellets, PEN powder, PLA, etc.) 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 female cavity and the male 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.
- the molded article shrinks inside of the molding cavity and, as such, when the cavity and core plates are urged apart, the molded article tends to remain associated with the male core piece.
- the molded article can be ejected off the male core piece by use of a suitable ejection structure.
- Numerous ejection structures are known to assist in removing the molded articles from the male core piece. Examples of the ejection structures include stripper plates, stripper rings and neck rings, ejector pins, etc.
- 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 of 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) contained 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 further includes a tamper-evident band 110.
- the purpose of the tamper-evident band 110 is to cooperate with a complementary tamper-evident structure of the closure device (not depicted) to provide a visual indication of when a seal between the final-shaped container produced from the preform 100 and the closure device (not depicted) has been compromised (or, simply put, when the closure device and the final-shaped container produced from the preform 100 have been at least partially opened).
- the neck portion 102 comprises a support ledge 112.
- the support ledge 112 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 ejection structures and/or handling structures) and the final-shaped container from the preform 100 (for example, cooperation with the blow- molding equipment to provide sealing and/or handling structures, etc.).
- a typical implementation of the support ledge 112 comprises a generally annular protrusion.
- the support ledge 112 has an external ring 112a and an internal ring 112b with an annulus of molding material 112c defined therebetween.
- Figure 2 depicts a perspective view of a portion of a preform 200 and, more specifically, a neck portion 202 and a portion of a body portion 204.
- the neck portion 202 is substantially similar to the neck portion 102 other than for the specific differences described herein below.
- the neck portion 202 comprises a support ledge 212.
- the support ledge 212 is generally annular in nature similarly to the support ledge 112 of Figure 1.
- the support ledge 212 further comprises a plurality of chamfers 214 defined on an upper outer extreme of the support ledge 212.
- the purpose of the plurality of chamfers 214 is to provide a visual indication to a consumer (or another entity) an indication that the preform 200 having the support ledge 212 with the plurality of chamfers 214 defined therein possesses a particular characteristic.
- the characteristic is a distinction between a single use (also known as one-way) beverage container and a recyclable beverage container.
- a pair of split mold inserts is used for molding of the neck portion 102.
- FIG. 3A depicts a perspective view of the pair of split mold inserts 302
- Figure 3B depicts a sectional view of the pair of split mold inserts 302 taken along a plane which traverses a plane of a split line (not depicted) of the pair of split mold inserts 302.
- the pair of split mold inserts 302 is also referred to sometimes by those of skill in the art as "neck rings”.
- the pair of split mold inserts 302 comprises a first split mold insert 304 and a second split mold insert 306.
- Each of the first split mold insert 304 and the second split mold insert 306 comprises a molding surface defining portion 308 (only one instance thereof being marked in Figure 3B for the sake of simplicity) for defining at least a portion of the neck portion 102 of the molded article 100.
- the molding surface defining portion 308 has
- portion means substantially half of the respective part (ex. the thread 108, the tamper-evident band 110 and the support ledge 112) defined by one of the first split mold insert 304 and the second split mold insert 304.
- first sub-portion 314 of each of the first split mold insert 304 and the second split mold insert 306 comprises a generally half-circular groove.
- the split insert comprises a body with a molding surface configured thereon.
- the split insert also includes a coolant channel configured in the body with a partition arranged therein. The partition dividing a portion of the coolant channel into a first and a second branch. A transfer coolant channel is configured between the branches.
- a preform suitable for blow-molding into a final-shaped container comprises a neck portion; a gate portion; and a body portion extending between said neck portion and said gate portion; the neck portion including a support ledge, the support ledge being associated with a metal contacting surface and a weight, and wherein a ratio of the metal contacting surface to the weight modulated for a base line support ledge thickness curve is selected in a range of between 0.1 and 1000.
- a split mold insert for defining at least a neck portion of a preform.
- the split mold insert comprises a body having a molding surface defining portion that includes a first sub-portion for defining, in use, a portion of a support ledge of the neck portion, the support ledge being associated with a metal contacting surface, a weight and a thickness; the first sub-portion being associated with a generally scalloped geometry so selected as to define the support ledge to be associated with a ratio of the metal contacting surface to the weight modulated for a base line support ledge thickness curve is selected in a range of between 0.1 and 1000.
- a preform suitable for blow-molding into a final-shaped container comprises a neck portion; a gate portion; and a body portion extending between said neck portion and said gate portion; the neck portion including a support ledge having a crenated edge, the support ledge being associated with a metal contacting surface being contributed to partially by the crenated edge and a weight, and wherein a ratio of the metal contacting surface to the weight modulated for base line support ledge thickness curve is selected in a range of between 0.1 and 1000
- a preform suitable for blow-molding into a final-shaped container comprises a neck portion; a gate portion; and a body portion extending between said neck portion and said gate portion; the neck portion including a support ledge, the support ledge being associated with a metal contacting surface and a weight, and wherein a ratio of the metal contacting surface to the weight is at least 1004 mm 2 /g.
- a split mold insert for defining at least a neck portion of a preform.
- the split mold insert comprises a body having a molding surface defining portion that includes a first sub-portion for defining, in use, a portion of a support ledge of the neck portion, the support ledge being associated with a metal contacting surface, a weight and a thickness; the first sub-portion being associated with a generally scalloped geometry so selected as to define the support ledge to be associated with a ratio of the metal contacting surface is at least 1004 mm 2 /g.
- Figure 1 depicts a cross sectional view of a preform 100 implemented in accordance with known techniques.
- Figure 2 depicts a perspective view of a portion of a preform 200 implemented in accordance with another known technique.
- Figure 3A depicts a perspective view of a pair of split mold inserts 302 that can be used for defining a portion of the preform 100 of Figure 1 and Figure 3B depicts a sectional view of the pair of split mold inserts 302 taken along a plane which traverses a plane of a split line of the pair of split mold inserts 302
- Figure 4A depicts a sectional view of the pair of split mold inserts 402 implemented according to a non-limiting embodiment of the present invention and Figure 4B depicts a partially truncated cross section taken through line S-S of the pair of split mold inserts 402 of Figure 4A.
- Figure 5A depicts a top view of the preform 500 produced, at least partially, using the pair of split mold inserts 402 of Figure 4A in one embodiment of the present invention and Figure 5B depicts a cross section taken along line A-A of the preform 500 of Figure 5A.
- Figure 6A to Figure 6N depict various embodiments for implementing a support ledge 612a, n.
- Figure 4A depicts a pair of split mold inserts 402 implemented according to a non-limiting embodiment of the present invention. More specifically, Figure 4A depicts a sectional view of the pair of split mold inserts 402 and Figure 4B depicts a partially truncated cross section taken through line S-S of the pair of split mold inserts 402 of Figure 4A.
- the pair of split mold inserts 402 comprises a first split mold insert 404 and a second split mold insert 406. Description to be presented herein below will mainly use the first split mold insert 404 as an example, but same teachings equally apply to the second split mold insert 406.
- the pair of split mold inserts 402 is configured for defining a portion of a preform 500 (depicted in Figure 5A and Figure 5B). More particularly, Figure 5A depicts a top view of the preform 500 and Figure 5B depicts a cross section taken along line A-A of the preform 500 of Figure 5A.
- the preform 500 consists of a neck portion 502, a gate portion 506 and a body portion 504 extending between the neck portion 502 and the gate portion 506.
- the neck portion 502 comprises a thread 508, which can be implemented in substantially the same manner as the thread 108 described herein above.
- the neck portion 502 further includes a tamper-evident band 510, which can be implemented in substantially the same manner as the tamper-evident band 110 described herein above.
- the thread 508 and the tamper-evident band 510 can be implemented differently. For example, there are numerous known designs and implementations for the thread 108.
- Some of the known designs and implementations include, but are not limited to, ALCOA 1716, ALCOA 1788, BPF-C, PCO-1810, PCO-1815, PCF-43P-1, ALCOA 1690, PCO 1816 and the like.
- the neck portion 502 further comprises a support ledge 512 implemented according to a non- limiting embodiment of the present invention.
- the first split mold insert 404 comprises a body 408.
- the body 408 comprises an attachment portion 410, which is used for attachment to a slide (not depicted) of a mold (not depicted).
- the body 408 further defines a cooling channel 412, via which a cooling medium (such as water and the like) is circulated during use, as will be readily appreciated by those of skill in the art.
- a cooling medium such as water and the like
- the cooling channel 412 can be implemented in a number of alternative ways, known to those skilled in the art.
- the body 408 further comprises a molding surface defining portion 414 for defining at least a portion of the neck portion 502 of the preform 500 ( Figure 5A and Figure 5B) and, in some cases, a portion of the body portion 504 (as is the case within this illustration).
- the molding surface defining portion 414 comprises:
- the first sub-portion 420 is associated with a generally scalloped geometry 422.
- the generally scalloped geometry 422 comprises a plurality of peaks 424 and a plurality of valleys 426.
- each of the plurality of peaks 424 is inter-disposed between two of the plurality of valleys 426 and vice versa.
- the support ledge 512 is associated with a crenated edge 514.
- the crenated edge 514 of the support ledge 512 is a mirror image of the generally scalloped geometry 422 of the first sub-portion 420 of the molding surface defining portion 414.
- the crenated edge 514 comprises a plurality of protrusions 516 and a plurality of depressions 518, which again correspond to the plurality of peaks 424 and the plurality of valleys 426.
- the support ledge 512 is also associated with a split line 580 which is defined where the first split mold insert 404 meets the second split mold insert 406.
- the split line 580 can be said to divide the support ledge 512 (and the neck portion 502, generally) into two virtual halves (not separately numbered), that are substantially mirror images of each other. Put another way, the support ledge 512 is divided by the split line 580 into a first virtual half (not separately numbered) and a second virtual half (not separately numbered).
- each of the first virtual half (not separately numbered) and the second virtual half (not separately numbered) is associated with an outline which includes substantially the same pattern of the plurality of protrusions 516 and the plurality of depressions 518.
- the support ledge 512 can be said to be associated with a metal contacting surface 520.
- the metal contacting surface 520 is a surface of the support ledge 512 that is in contact, during use, with the molding surface defining portion 414 and, more specifically, mainly with the first sub-portion 420. It is worthwhile noting that a portion of the metal contacting surface 520 is contributed to by the crenated edge 514.
- the support ledge 512 is also associated with a weight, which is the weight of molding material used for defining the support ledge 512.
- the support ledge 512 is also associated with a thickness, which is a distance between an upper extreme and a lower extreme thereof.
- the support ledge 512 is associated with a contact surface to weight ratio (CSTWR).
- CSTWR contact surface to weight ratio
- CSTWR is the contact surface to weight ratio
- MCS is the metal contacting surface 520 of the support ledge 512; W is the weight of the support ledge 512.
- the contact surface to weight ratio (CSTWR) ranges between 1004 mm 2 /g and 1062.1 mm 2 /g.
- the contact surface to weight ratio (CSTWR) varied depending on a thickness of the support ledge 512 and a particular design of the crenated edge 514 (for example, the number of the plurality of protrusions 516 and the plurality of depressions 518 used).
- the contact surface to weight ratio (CSTWR) for the preform 100 of Figure 1 (using the same parameters of the neck finish and thickness) is approximately 969.8 mm 2 /g.
- the contact surface to weight ratio (CSTWR) of the preform 200 of Figure 2 (using the same parameters of the neck finish and thickness) is approximately 993.1 mm Ig. Accordingly, it can be said that within certain non-limiting embodiments of the present invention, the contact surface to weight ratio (CSTWR) is selected from at least 1004 mm Ig.
- the contact surface to weight ratio (CSTWR) can be selected in a different range, which will depend on different parameters, such as for example, particular design of the crenated edge 514 (for example, the number of the plurality of protrusions 516 and the plurality of depressions 518 used), thickness of the support ledge, overall neck finish design and the like.
- the contact surface to weight ratio (CSTWR) decreases.
- the contact surface to weight ratio (CSTWR) for the preform 500 is generally higher than the same ratio for the preform 100 or the preform 200 (provided that thickness and design of the neck finish remain the same).
- the support ledge 512 is associated with a contact surface to weight ratio modulated for a base line support ledge thickness curve (CSTWRM), which can be calculated using the following formulae:
- CSTWRM is the contact surface to weight ratio modulated for a base line support ledge thickness curve
- MCS is the metal contacting surface 520 of the support ledge 512
- W is the weight of the support ledge 512; and F (T) is a function of a contact surface to weight ratio over a selected range of thickness associated with a selected base line support ledge.
- F (T) AcONSTANT X T - BcONSTANT X T + CcONSTANT
- values for ACONS TA N T , BCONS TA N T and CCONS TA N T are generated using a function of a curve representative of the contact surface to weight ratio over a selected range of thickness of the selected base line support ledge.
- the function F(T) is calculated using the following values for constants ACONSTANT, BCONSTANT and CCONSTANT:
- the values for ACONS TA N T , BCONS TA N T and CCONS TA N T have been generated using values associated with the preform 200 of Figure 2, which has been used as a base line.
- other values for the constants ACONS TA N T , BCONS TA N T and CCONS TA N T can be used.
- the support ledge 112 of the preform 100 is selected, the following values can be used:
- the contact surface to weight ratio modulated for a base line support ledge thickness curve ranges between 0.1 and 1000.
- the metal contacting surface 520 (MCS) of the support ledge 512 is 718.2 mm and the weight (W) of the support ledge 512 is 0.702 grams and the thickness of the support ledge 512 is 1.45 mm. It should be noted that the metal contacting surface 520 and the weight is contributed to, in substantially equal parts, by the first and second virtual halves (not separately numbered) of the support ledge 512. Within this non-limiting embodiment of the present invention, the contact surface to weight ratio (CSTWR) is 1034.6 mm 2 /g.
- the contact surface to weight ratio modulated for a base line support ledge thickness curve (CSTWRM) using the preform 200 of Figure 2 as a base line is 41.49.
- the support ledge 512 comprises the crenated edge 514 having eight instances of the protrusions 516 and eight instances of the depressions 518.
- the metal contacting surface 520 (MCS) of the support ledge 512 is 718.2 mm and the weight (W) of the support ledge 512 is 0.702 grams and the thickness of the support ledge 512 is 1.45 mm. It should be noted that the metal contacting surface 520 and the weight is contributed to, in substantially equal parts, by the first and second virtual halves (not separately numbered) of the support ledge 512. Within this non-limiting embodiment of the present invention, the contact surface to weight ratio (CSTWR) is 1023.6 mm Ig.
- the contact surface to weight ratio modulated for a base line support ledge thickness curve (CSTWRM) using the preform 200 of Figure 2 as a base line is 30.54.
- the support ledge 512 comprises the crenated edge 514 having six instances of the protrusions 516 and six instances of the depressions 518.
- Figure 4 A, Figure 4B, Figure 5 A and Figure 5 B are illustrations of specific embodiment only. Other configurations for the support ledge 512 and the first sub-portion 420 of the molding surface defining portion 414, associated therewith, are possible. Generally speaking, exact number of the plurality of protrusions 516 and a plurality of depressions 518 (and, therefore, the plurality of peaks 424 and the plurality of valleys 426), the exact geometry, such as curvature and/or angle and/or shape and/or radius, of the plurality of protrusions 516 and a plurality of depressions 518 (and, therefore, the plurality of peaks 424 and the plurality of valleys 426) is not limited. More specifically, with reference to Figure 6A to Figure 6N, there is depicted a number of alternative designs of the support ledge 612a to 612n.
- Figure 6A depicts a support ledge 612a implemented according to an alternative non- limiting embodiment of the present invention.
- the support ledge 612a is implemented having three instances of a protrusion 616a and three instances of a depression 618a. It is worthwhile noting that the configuration of the support ledge 612a has been modified in an area generally depicted at 680a to prevent creation of a negative angle.
- negative angle means an angle that would create an undercut and would render the design non-demoldable.
- Figure 6B depicts a support ledge 612b implemented according to an alternative non- limiting embodiment of the present invention.
- the support ledge 612b is implemented having four instances of a protrusion 616b and four instances of a depression 618b. It is worthwhile noting that the implementation of Figure 6B is an example of a standard implementation where a split line 650b passes through a first one and a second one of diametrically opposed ones of the four instances of the protrusion 616b.
- Figure 6C depicts a support ledge 612c implemented according to an alternative non- limiting embodiment of the present invention.
- the support ledge 612c is implemented having five instances of a protrusion 616c and five instances of a depression 618b.
- the configuration of the support ledge 612c has been modified in an area generally depicted at 680c to prevent creation of a negative angle.
- a split line 650c passes through one of the fine instances of the protrusion 616c and a modified one of the five instances of the depression 618c in the area 680c between two modified ones of the five instances of the protrusion 616c.
- Figure 6D depicts a support ledge 612d implemented according to an alternative non- limiting embodiment of the present invention.
- the support ledge 612d is implemented having six instances of a protrusion 616d and six instances of a depression 618d. It is worthwhile noting that the implementation of Figure 6C is another example of a standard implementation of the support ledge 612d.
- Figure 6E depicts a support ledge 612e implemented according to an alternative non- limiting embodiment of the present invention.
- the support ledge 612e is substantially similar to the support ledge 612d, but for the shape of a plurality of protrusions 616e and an angle of a depression 618d depicted at 67Oe.
- Figure 6F depicts a support ledge 612f implemented according to an alternative non-limiting embodiment of the present invention.
- the support ledge 612f is implemented having seven instances of a protrusion 616f and seven instances of a depression 618f. It is worthwhile noting that the configuration of the support ledge 612f has been modified in an area generally depicted at 680f to prevent creation of a negative angle.
- This is an example of a modified implementation where a split line 650f passes through one of the seven instances of the protrusion 616f and a modified one of the seven instances of the depression 618f in the area 680f between two modified ones of the seven instances of the protrusion 616f.
- Figure 6G depicts a support ledge 612g implemented according to an alternative non- limiting embodiment of the present invention.
- the support ledge 612g is substantially similar to the support ledge 612f, but for the shape of a plurality of protrusions 616g and an angle of a depression 618g depicted at 67Og.
- Figure 6H depicts a support ledge 612h implemented according to an alternative non- limiting embodiment of the present invention.
- the support ledge 612h is implemented having eight instances of a protrusion 616h and eight instances of a depression 618h. It is worthwhile noting that the implementation of Figure 6H is another example of a standard implementation of the support ledge 612h.
- Figure 61 depicts a support ledge 612i implemented according to an alternative non-limiting embodiment of the present invention.
- the support ledge 612i is implemented having nine instances of a protrusion 616i and nine instances of a depression 618i. It is worthwhile noting that the configuration of the support ledge 612i has been modified in an area generally depicted at 68Oi to prevent creation of a negative angle. This is an example of a modified implementation where a split line 650i passes through one of the nine instances of the protrusion 616i and a modified one of the nine instances of the depression 618i in the area 680i between two modified ones of the nine instances of the protrusion 616i.
- Figure 6 J depicts a support ledge 612j implemented according to an alternative non-limiting embodiment of the present invention.
- the support ledge 612j is implemented having ten instances of a protrusion 616j and ten instances of a depression 618j. It is worthwhile noting that the implementation of Figure 6J is another example of a standard implementation of the support ledge 612j.
- Figure 6K depicts a support ledge 612k implemented according to an alternative non- limiting embodiment of the present invention.
- the support ledge 612k is implemented having eleven instances of a protrusion 616k and eleven instances of a depression 618k. It is worthwhile noting that the configuration of the support ledge 612k has been modified in an area generally depicted at 680k to prevent creation of a negative angle. This is an example of a modified implementation where a split line 650k passes through one of the eleven instances of the protrusion 616k and a modified one of the eleven instances of the depression 618k in the area 680k between two modified ones of the eleven instances of the protrusion 616k.
- Figure 6L depicts a support ledge 6121 implemented according to an alternative non- limiting embodiment of the present invention.
- the support ledge 6121 is implemented having twelve instances of a protrusion 6161 and twelve instances of a depression 6181. It is worthwhile noting that the implementation of Figure 6L is another example of a standard implementation of the support ledge 6121. It is also worthwhile noting that implementation of Figure 6L can be considered an example of a diversified implementation, where some of the twelve instances of the protrusion 6161 have a different shape than others of twelve instances of the protrusion 6161. For example, a protrusion 660a is shaped differently than a protrusion 660b.
- Figure 6M depicts a support ledge 612m implemented according to an alternative non-limiting embodiment of the present invention.
- the support ledge 612m is implemented having thirteen instances of a protrusion 616m and thirteen instances of a depression 618m. It is worthwhile noting that the configuration of the support ledge 612m has been modified in an area generally depicted at 680m to prevent creation of a negative angle. This is an example of a modified implementation where a split line 650m passes through one of the thirteen instances of the protrusion 616m and a modified one of the depression 618m in the area 680m between two modified ones of the thirteen instances of the protrusion 616m. It is also worthwhile noting that implementation of Figure 6M can be considered an example of a diversified implementation, where some of the thirteen instances of the protrusion 616m have a different shape than others of the thirteen instances of the protrusion 616m.
- Figure 6N depicts a support ledge 612n implemented according to an alternative non- limiting embodiment of the present invention.
- the support ledge 612n is substantially similar to the support ledge 612m, but for the shape of a protrusion 616n, which is an example of a more rounded implementation thereof.
- the implementation is considered to be generally standard where a split line (not depicted) passes through a first one and a second one of diametrically opposed ones of a plurality of protrusions (such the four instances of the protrusion 616b).
- the generally scalloped geometry 422 is further selected such that the split line 580 is defined substantially through a center of a first one and a second one of diametrically opposed ones of the plurality of protrusions 516.
- the geometry of a given one of the plurality of protrusions 516 that is traversed by the split line 580 can be modified to prevent creation of a negative angle that would be otherwise detrimental to demolding.
- modification to some of the protrusions for example, some of the five instances of the protrusion 616c
- some of the depressions for example, some of the five instances of the depression 618c
- the implementation is considered to be generally "modified", where a split line (not depicted) passes through one of a plurality of protrusions (for example, the five instances of the protrusion 616c) and a modified depression (such as the modified one of the five instances of the depression 618c) in a modified area (such as, the area 680c).
- a split line passes through one of a plurality of protrusions (for example, the five instances of the protrusion 616c) and a modified depression (such as the modified one of the five instances of the depression 618c) in a modified area (such as, the area 680c).
- the implementation can be considered generally undiversified, such as the case, for example, with the support ledge 612b, where all of the plurality of protrusions (such as, for example, all of the four instances of the protrusion 616b) are implemented in substantially the same manner.
- a given one of the plurality of protrusions such as, for example, one of the four instances of the protrusion 616b
- another one of the plurality of protrusions such as, for example, another one of the four instances of the protrusion 616b).
- the implementation can be considered generally diversified, such as the case, for example, with the support ledge 6121, where some of the twelve instances of the protrusion 6161 are implemented differently from others of the twelve instances of the protrusion 6161.
- a given one of the plurality of protrusions (such as, for example, a given one of the twelve instances of the protrusion 6161) is implemented in a first manner (such as, for example, a first shape and/or a first angle, etc.) and another one of the plurality of protrusions (such as, for example, another one of the twelve instances of the protrusion 6161) is implemented a second manner (such as, for example, a second shape and/or a second angle, etc.).
- a first manner such as, for example, a first shape and/or a first angle, etc.
- another one of the plurality of protrusions (such as, for example, another one of the twelve instances of the protrusion 61) is implemented a second manner (such as, for example, a second shape and/or a second angle, etc.).
- machining constraints as well as constraints imposed by the use of specific equipment (for example, blow-molding equipment, etc.).
- a technical effect of an embodiment of the present invention includes provision of a support ledge 512 that uses less material compared to prior art designs.
- the material saving can be approximately 30% and as high as 50% of material that would have otherwise be used.
- an additional technical effect attributable to material saving in the support ledge 512 can be an overall material savings that is approximately 3% of the overall preform 500 weight.
- Another technical effect of an embodiment of the present invention includes provision of a support ledge 512 that is more efficiently cooled at least partially due to increased contact with metal. For example, if the preform 200 of Figure 2 is compared to the preform 100 of Figure 1, the metal contact area of the preform 200 is slightly larger than that of the preform 100. The increase in the metal contact area of the preform 500 (and other alternative implementation taught herein), on the other hand, is comparatively more significant.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09726200A EP2271469A4 (en) | 2008-03-26 | 2009-02-13 | A preform and a mold stack for producing the preform |
US12/918,664 US20100326947A1 (en) | 2008-03-26 | 2009-02-13 | Preform and a mold stack for producing the preform |
CA2716258A CA2716258A1 (en) | 2008-03-26 | 2009-02-13 | A preform and a mold stack for producing the preform |
CN2009801091698A CN101970196A (en) | 2008-03-26 | 2009-02-13 | A preform and a mold stack for producing the preform |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US3968508P | 2008-03-26 | 2008-03-26 | |
US61/039,685 | 2008-03-26 |
Publications (1)
Publication Number | Publication Date |
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WO2009117805A1 true WO2009117805A1 (en) | 2009-10-01 |
Family
ID=41112875
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA2009/000153 WO2009117805A1 (en) | 2008-03-26 | 2009-02-13 | A preform and a mold stack for producing the preform |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100326947A1 (en) |
EP (1) | EP2271469A4 (en) |
CN (1) | CN101970196A (en) |
CA (1) | CA2716258A1 (en) |
WO (1) | WO2009117805A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US9533788B2 (en) * | 2012-06-12 | 2017-01-03 | Patrick Michael Calello | Lightweight preform having a decreased weight support ring |
CN105438581B (en) * | 2015-12-22 | 2018-03-20 | 林明茳 | Base body thickeies formula plastic bottle blank |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5599567A (en) * | 1995-10-16 | 1997-02-04 | Gellert; Jobst U. | Cooled thread split inserts for injection molding preforms |
CA2505697A1 (en) * | 2002-11-08 | 2004-05-27 | Advanced Plastics Technologies Ltd. | Injection mold having a wear resistant portion and a high heat transfer portion and a method of forming a preform |
CA2509181A1 (en) * | 2005-06-03 | 2006-12-03 | Husky Injection Molding Systems Ltd. | A mold split insert |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3904061A (en) * | 1973-05-14 | 1975-09-09 | Klm Company | Tamper-proof bottle closure |
US4337870A (en) * | 1980-04-23 | 1982-07-06 | Keeler Frederick D | Tamper-proof closure cap and method of fabrication |
US6557714B2 (en) * | 2001-03-22 | 2003-05-06 | Alcoa Closure Systems International, Inc. | Tamper-evident package |
US6659297B2 (en) * | 2001-11-28 | 2003-12-09 | Owens-Illinois Closure Inc. | Tamper-indicating closure, container, package and methods of manufacture |
US20030155320A1 (en) * | 2002-02-19 | 2003-08-21 | Fci, Inc., An Ohio Corporation | Plastic water bottle |
WO2003070579A1 (en) * | 2002-02-19 | 2003-08-28 | Fci, Inc. | Plastic water bottle and apparatus and method to prevent bottle rotation |
US7028857B2 (en) * | 2003-05-28 | 2006-04-18 | Fci, Inc. | Plastic water bottle and apparatus and method to convey the bottle and prevent bottle rotation |
-
2009
- 2009-02-13 EP EP09726200A patent/EP2271469A4/en not_active Withdrawn
- 2009-02-13 CA CA2716258A patent/CA2716258A1/en not_active Abandoned
- 2009-02-13 WO PCT/CA2009/000153 patent/WO2009117805A1/en active Application Filing
- 2009-02-13 CN CN2009801091698A patent/CN101970196A/en active Pending
- 2009-02-13 US US12/918,664 patent/US20100326947A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5599567A (en) * | 1995-10-16 | 1997-02-04 | Gellert; Jobst U. | Cooled thread split inserts for injection molding preforms |
CA2505697A1 (en) * | 2002-11-08 | 2004-05-27 | Advanced Plastics Technologies Ltd. | Injection mold having a wear resistant portion and a high heat transfer portion and a method of forming a preform |
CA2509181A1 (en) * | 2005-06-03 | 2006-12-03 | Husky Injection Molding Systems Ltd. | A mold split insert |
Non-Patent Citations (1)
Title |
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See also references of EP2271469A4 * |
Also Published As
Publication number | Publication date |
---|---|
CN101970196A (en) | 2011-02-09 |
CA2716258A1 (en) | 2009-10-01 |
US20100326947A1 (en) | 2010-12-30 |
EP2271469A4 (en) | 2011-05-11 |
EP2271469A1 (en) | 2011-01-12 |
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