GB2149341A - Injection blow moulding of plastics bottles - Google Patents
Injection blow moulding of plastics bottles Download PDFInfo
- Publication number
- GB2149341A GB2149341A GB08427387A GB8427387A GB2149341A GB 2149341 A GB2149341 A GB 2149341A GB 08427387 A GB08427387 A GB 08427387A GB 8427387 A GB8427387 A GB 8427387A GB 2149341 A GB2149341 A GB 2149341A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mould
- moulding
- neck
- cavity
- blowing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 229920003023 plastic Polymers 0.000 title claims abstract description 11
- 239000004033 plastic Substances 0.000 title claims abstract description 11
- 238000010102 injection blow moulding Methods 0.000 title description 2
- 238000000465 moulding Methods 0.000 claims abstract description 58
- 238000007664 blowing Methods 0.000 claims abstract description 42
- 238000002347 injection Methods 0.000 claims abstract description 29
- 239000007924 injection Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000000071 blow moulding Methods 0.000 claims abstract description 12
- 238000001746 injection moulding Methods 0.000 claims abstract description 5
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Classifications
-
- 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
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
-
- 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
- B29C2049/4881—Moulds characterised by mould configurations having a mandrel or core e.g. two mould halves with a core in-between
-
- 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
- B29C49/0665—Injection blow-moulding the injection mould cavity and the blow-mould cavity being displaceable to the geometrically fixed injection core 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/08—Biaxial stretching during blow-moulding
- B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
- B29C49/12—Stretching rods
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
A process for, the blow moulding of plastics bottles from injection moulded parisons permits the moulded bottles to be released from the blowing mould (10) without the use of a split blowing mould by using a split neck mould (1) having a mouth moulding portion (3) and a shoulder moulding portion (4). When injection moulding the parson (22), Fig. 1, the neck mould (1) co-operates with an injection mould (5) which forms with the neck mould (1) a parison moulding cavity (8) consisting of the injection mould cavity and the mouth moulding portion (3) of the neck mould. When blow moulding a bottle (25) from the parson, Fig. 3, the neck mould (1) co-operates with a blowing mould (10) to form a bottle moulding cavity which consists of the blow mould cavity (12) and the shoulder moulding portion (4) of the neck mould. <IMAGE>
Description
SPECIFICATION
Injection blow moulding of plastics bottles
THIS INVENTION relates to a moulding process and apparatus in which a plastics parison is injection moulded and then immediately blow moulded, with or without stretching, to form a bottle.
A A split blowing mould is usually employed in the blow moulding of plastics bottles, so that the moulding apparatus must be provided with a means of opening and closing the split blowing mould and requires additional space for the opened mould parts. Elimination of the opening and closing means and the additional space for the opened blowing mould parts would further simplify the mechanism of a moulding machine which consecutively carries out the blow moulding, with or without stretching, of injection moulded parisons into bottles, as disclosed in U.S. Patent No.
4,105.391.
A blow moulded bottle cannot be drawn out of the known blowing mould without splitting the mould because the shoulder part of the moulded bottle forms an obstacle to drawing the bottle out.
The present invention aims to eliminate the need for split blowing moulds in such moulding processes and apparatus and, in one aspect of the invention, provides a process for moulding plastics bottles, comprising: injection moulding a parison using a split neck mould and a one-piece injection mould which, when closed together, define a parison moulding cavity formed by the injection mould cavity and a mouth moulding portion of the neck mould; withdrawing the parison from the injection mould by separating the neck mould and the injection mould; blow moulding the parison to form a bottle using a one-piece blowing mould which, when closed by the neck mould, defines with the neck mould a blowing cavity formed by the blowing mould cavity and a shoulder moulding portion of the neck mould; and withdrawing the moulded bottle from the blowing mould by separating the neck mould and the blowing mould.
The invention also provides apparatus for moulding plastics bottles, comprising: a split neck mould having a mouth moulding portion and a shoulder moulding portion for moulding a mouth and shoulder of the bottle, respectively; a one-piece injection mould which, when closed by the neck mould, defines with the neck mould a parison moulding cavity formed by the injection mould cavity and the mouth moulding portion of the neck mould; and a one-piece blowing mould which, when closed by the neck mould, defines with the neck mould a blowing cavity formed by the blowing mould cavity and a shoulder moulding portion of the neck mould.
In one embodiment of the invention, a projection around the injection mould cavity is arranged to fit into the cavity of the shoulder moulding portion of the neck mould when the injection mould and the neck mould are closed together.
Conveniently, a recess around the blowing mould cavity is arranged to recieve the shoulder moulding portion of the neck mould when the blowing mould and the neck mould are closed together.
Desirably, an open end of the blowing mould cavity has the same diameter as an open end of the cavity of the shoulder moulding portion of the neck mould, the blowing mould cavity being straight sided or having a side wall slanting slightly outwardly towards the open end of the cavity.
A moulding process and apparatus embody- ing the invention may provide for mechanically stretching the parison during blow moulding of the parison.
The elimination of the need for splitting the blowing mould by the present invention simplified the moulding process and apparatus, thereby reducing the cost, and increasing the efficiency, of such process and apparatus.
In order that the invention may be readily understood, an embodiment thereof will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a vertical sectional view of the moulds employed in a parison moulding operation of a moulding process embodying the invention;
Figure 2 is a vertical sectional view of the parison moulds when the parison is released;
Figure 3 is a vertical sectional view of the moulds employed in a bottle moulding operation of the moulding process embodying the invention; and
Figure 4 is a vertical sectional view of the bottle moulds when the bottle is released.
As shown in the Figures, a split, or openable, neck mould 1 is used in a moulding process embodying the invention and comprises a pair of mould parts hingedly attached to the bottom surface of a shifting plate 2.
The neck mould 1 is provided with a mould portion 4 for moulding a bottle shoulder below a mould portion 3 for moulding a threaded bottle mouth, so as initially to form the bottle mouth during injection moulding of the parison and a shoulder adjoining the mouth ducting subsequently blowing of the bottle. A one-piece injection mould 5 (see
Figs. 1 and 2) for moulding parisons has an injection nozzle 7 at its bottom and is fixed on a mould closing plate 6. A projection around the periphery of the open end of the cavity of the injection mould 5 is arranged to fit into the cavity of the shoulder portion 4 of the neck mould 1 so as to form a parison moulding cavity 8 in combination with the mouth moulding portion 3 of the neck mould, as shown in Fig. 1.
Referring to Figs. 3 and 4, a blowing mould 10, composed of a one-piece mould fixed to a mould closing table 11 which is vertically movable, has a mould cavity 12 for moulding the body of the bottle below the shoulder of the bottle. A recess 13 around periphery of the open end of the cavity 12 is arranged to receive the mould portion 4 of the neck mould 1, so that the cavity 12 of the mould 10 and the cavity of the mould portion 4 of the neck mould 1 together constitute a bottle moulding cavity as shown in Fig. 4. The open end of the cavity 12 has the same diameter as the open end of the cavity of the mould portion 4 and the cavity 12 also has a wall which is vertical, ie straight sided, or slants slightly outwardly towards the open end of the cavity to allow easy release of a moulded bottle.
The process of moulding a bottle using the described moulding apparatus will now be described.
The neck mould 1 and the injection mould 5 5 are brought together as shown in Fig. 1 in a mould closing operation by raising the plate 6, and a core 21 is inserted into the centre of the cavity 8 from above the shifting plate 2 through the neck mould 1. After mould closure, melted resin is injected through the injection nozzle 7 into the mould space, which extends from the bottom of the cavity to the top of the mould portion 3 of the neck mould 1, to mould a parison 22 having a neck and bottom.
After the injection moulding operation, the injection mould 5 is lowered with the mould closing plate 6 and the core 21 is retracted to a position above the shifting plate 2. The parison 22, being gripped by the neck mould 1, is released from the cavity of the injection mould 5 by the downward movement of the injection mould 5.
The neck mould 1, together with the parison 22, is next moved to a position over the blowing mould 10, and the blowing mould 10 is raised with the table II to join with the neck mould 1 in a mould closing operation.
The parison 22 is thereby positioned in the centre of the cavity 12 and the open end of the mould portion 4 is fitted into the recess 13 to form the cavity for blow moulding the bottle.
After the completion of the mould closing operation, a blowing tube 23 is inserted into the neck mould 1 and a stretching rod 24 is positioned in the parison 22 and extended down to the bottom of the cavity. In synchronism with this extension, air is blown into the parison so that the parison expands to form the bottle 25, as shown in Fig. 3.
After the blow moulding of the bottle 25, the table ll and the attached blowing mould 10 are lowered to open the mould. The moulding of the bottle 25 is carried out by the combination the mould portion 4 of neck mould 1 and the blowing mould 10, the moulded bottle being released from the cavity smoothly because the neck mould 1 and the bottle 25 gripped thereby separate from the blowing mould 10.
The moulded bottle 25 is shifted with the neck mould 1 to a discharge position, where the neck mould is split. or opened, to release the bottle from the neck mould 1.
Although the above described embodiment of the invention involves a blow moulding operation in which the parison is mechanically stretched during blowing, clearly the invention is applicable to processes in which the parison is blown without stretching.
Claims (11)
1. A process for moulding plastics bottles.
comprising: injection moulding a parison using a split neck mould and a one-piece injection mould which, when closed together, define a parison moulding cavity formed by the injection mould cavity and a mouth moulding portion of the neck mould; withdrawing the parison from the injection mould by separating the neck mould and the injection mould; blow moulding the parison to form a bottle using a one-piece blowing mould which, when closed by the neck mould, defines with the neck mould a blowing cavity formed by the blowing mould cavity and a shoulder moulding portion of the neck mould; and withdrawing the moulded bottle from the blowing mould by separating the neck mould and the blowing mould.
2. A process according to Claim 1, including mechanically stretching the parison during blow moulding of the parison.
3. Apparatus for moulding plastics bottles, comprising: a split neck mould having a mouth moulding portion and a shoulder moulding portion for moulding a mouth and shoulder of the bottle, respectively; a onepiece injection mould which, when closed by the neck mould, defines with the neck mould a parison moulding cavity formed by the injection mould cavity and the mouth moulding portion of the neck mould; and a one-piece blowing mould which, when closed by the neck mould, defines with the neck mould a blowing cavity formed by the blowing mould cavity and a shoulder moulding portion of the neck mould.
4. Apparatus according to Claim 3, wherein a projection around the injection mould cavity is arranged to fit into the cavity of the shoulder moulding portion of the neck mould when the injection mould and the neck mould are closed together.
5. Apparatus according to Claim 3 or 4, wherein a recess around the blowing mould cavity is arranged to receive the shoulder moulding portion of the neck mould when the blowing mould and the neck mould are closed together.
6. Apparatus according to any one of claims 3 to 5, wherein an open end of the blowing mould cavity has the same diameter as an open end of the cavity of the shoulder moulding portion of the neck mould, the blowing mould cavity being straight sided or having a side wall slanting slightly outwardly towards the open end of the cavity.
7. Apparatus according to any one of claims 3 to 6, wherein the mouth moulding portion of the neck mould is arranged to mould a threaded mouth of the bottle.
8. Apparatus according to any one of claims 3 to 7, including means for mechanically stretching the parison during blow moulding of the parison.
9. A process for moulding plastics bottles substantially as hereinbefore described with reference to the accompanying drawings.
10. Apparatus for moulding plastics bottles, substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawings.
11. An novel feature or combination of features described herein.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58204219A JPS6096434A (en) | 1983-10-31 | 1983-10-31 | Injection blow molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8427387D0 GB8427387D0 (en) | 1984-12-05 |
| GB2149341A true GB2149341A (en) | 1985-06-12 |
Family
ID=16486805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08427387A Withdrawn GB2149341A (en) | 1983-10-31 | 1984-10-30 | Injection blow moulding of plastics bottles |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS6096434A (en) |
| DE (1) | DE3439601A1 (en) |
| FR (1) | FR2554044A1 (en) |
| GB (1) | GB2149341A (en) |
| IT (1) | IT1179811B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5051227A (en) * | 1988-12-05 | 1991-09-24 | Electra Form, Inc. | Production of preforms and blow molded articles |
| US5061173A (en) * | 1989-11-20 | 1991-10-29 | Sunbeam Plastics Corporation | Injection-blow molding apparatus including circumferentially continuous injection molds, blow molds and shoulder forming sleeves |
| WO1996030189A1 (en) * | 1995-03-31 | 1996-10-03 | Carter Holt Harvey Limited | Blow-moulding handled containers in pet or like plastics and related preforms, methods and apparatus |
| EP2347882A3 (en) * | 2010-01-21 | 2014-01-22 | Krones AG | Device and method for manufacturing plastic containers |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3826842A1 (en) * | 1988-08-06 | 1990-02-08 | Berstorff Gmbh Masch Hermann | Process and device for the trouble-free grasping, centring and stretching of a preform in a stretch blow moulding installation |
| EP0432916A3 (en) * | 1989-11-20 | 1991-11-27 | Aerosol Research Company (Great Britain) Limited | Injection-blow moulding apparatus |
| JPH0994872A (en) * | 1995-09-29 | 1997-04-08 | Aokiko Kenkyusho:Kk | Method for injection draw blow molding |
| FR2914875B1 (en) * | 2007-04-13 | 2009-07-10 | Sidel Participations | MOLDING DEVICE FOR THE MANUFACTURE OF THERMOPLASTIC CONTAINERS BY BLOWING OR STRETCH BLOWING. |
| CN109177120A (en) * | 2018-09-21 | 2019-01-11 | 东莞市红色塑胶科技有限公司 | A kind of molding die and its forming method of hollow beveled plastic bottle |
| CN110126206A (en) * | 2019-06-19 | 2019-08-16 | 广东星联精密机械有限公司 | A kind of die cavity gos deep into the bottle base forming part assembly and its preform mould of die lip cooperation |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3408691A (en) * | 1964-01-22 | 1968-11-05 | Continental Can Co | Injection blow molding machines |
| GB1174835A (en) * | 1967-10-10 | 1969-12-17 | Cope Allman Internat Ltd | Machines for manufacturing Hollow Bodies from Plastics |
| US4078484A (en) * | 1976-05-10 | 1978-03-14 | Rockaway Corporation | Automatic actuator for normally manually operable selector elements |
| US4287150A (en) * | 1979-05-21 | 1981-09-01 | Hercules Incorporated | Method and apparatus for injection blow molding an article with improved detail definition |
| FR2488547A1 (en) * | 1980-08-18 | 1982-02-19 | Yoshida Kogyo Kk | Combination injection and blow moulding process - for making wide bodied containers to avoid longitudinal parting line marks and associated printing problems etc. |
-
1983
- 1983-10-31 JP JP58204219A patent/JPS6096434A/en active Granted
-
1984
- 1984-10-30 GB GB08427387A patent/GB2149341A/en not_active Withdrawn
- 1984-10-30 DE DE19843439601 patent/DE3439601A1/en not_active Withdrawn
- 1984-10-31 FR FR8416671A patent/FR2554044A1/en active Pending
- 1984-10-31 IT IT68090/84A patent/IT1179811B/en active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5051227A (en) * | 1988-12-05 | 1991-09-24 | Electra Form, Inc. | Production of preforms and blow molded articles |
| US5061173A (en) * | 1989-11-20 | 1991-10-29 | Sunbeam Plastics Corporation | Injection-blow molding apparatus including circumferentially continuous injection molds, blow molds and shoulder forming sleeves |
| WO1996030189A1 (en) * | 1995-03-31 | 1996-10-03 | Carter Holt Harvey Limited | Blow-moulding handled containers in pet or like plastics and related preforms, methods and apparatus |
| EP2347882A3 (en) * | 2010-01-21 | 2014-01-22 | Krones AG | Device and method for manufacturing plastic containers |
| US8790112B2 (en) | 2010-01-21 | 2014-07-29 | Krones Ag | Device and method for manufacturing plastic containers |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3439601A1 (en) | 1985-05-09 |
| JPS6096434A (en) | 1985-05-30 |
| FR2554044A1 (en) | 1985-05-03 |
| IT8468090A1 (en) | 1986-05-01 |
| GB8427387D0 (en) | 1984-12-05 |
| JPH0365246B2 (en) | 1991-10-11 |
| IT1179811B (en) | 1987-09-16 |
| IT8468090A0 (en) | 1984-10-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |