GB786416A - Improvements in and relating to vacuum deep-drawing of thermoplastic sheet material - Google Patents
Improvements in and relating to vacuum deep-drawing of thermoplastic sheet materialInfo
- Publication number
- GB786416A GB786416A GB30455/56A GB3045556A GB786416A GB 786416 A GB786416 A GB 786416A GB 30455/56 A GB30455/56 A GB 30455/56A GB 3045556 A GB3045556 A GB 3045556A GB 786416 A GB786416 A GB 786416A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- mould
- sheet
- vacuum
- closed
- 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.)
- Expired
Links
- 239000000463 material Substances 0.000 title abstract 5
- 229920001169 thermoplastic Polymers 0.000 title abstract 2
- 239000004416 thermosoftening plastic Substances 0.000 title abstract 2
- 239000007787 solid Substances 0.000 abstract 2
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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/10—Forming by pressure difference, e.g. vacuum
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
786,416. Vacuum deep-drawing of thermoplastic sheet material. HYDRO-CHEMIE AKT.-GES. Oct. 5, 1956 [Oct. 5, 1955], No. 30455/56. Addition to 781,979. Class 87(2). In the parent Specification the maximum vacuum is not applied to the mould 2 until the sheet material 17 is about to make contact with the mould. The present in. vention incorporates the additional step that the vacuum is cut off from the mould only after the moulded sheet material has cooled down enough to become solid. This ensures that minute details of the mould surface are reproduced on the moulded sheet material. The Figure shows apparatus comprising an evacuating pump 10 which withdraws air from the mould 2 by way of pipe 8, valve 9 and ducts 3 in the mould. A branch pipe 11 containing a valve 12 leads from pipe 8 to a vacuum container 13. Another branch pipe 14 leads from pipe 8 via valve 16 to a compressed-air container 15. Operation. (1) Valves 9 and 16 being closed, and valve 12 being open, the pump 10 operates to maintain a substantial vacuum in container, whilst the sheet 17, which is clamped on the mould by a hinged frame 18, is heated by an electric resistance heater 19. (2) The heater 19 is switched off and valve 9 is opened, whereby the sheet is sucked into the mould. (3) Just before the sheet makes contact with the mould the valve 12 is closed, as in the parent Specification, to give a high vacuum between the mould and the sheet. (4) This high vacuum is maintained until the sheet is cool and solid. (5) Valve 9 is closed, frame 18 is swung away and valve 16 is opened, whereby compressed air forces the sheet away from the mould surface. Immediately after valve 9 has been closed, valve 12 is opened to re-establish the vacuum in container 13. The valves 9, 12 and 16 may be operable manually or automatically. If they are operated mechanically, (a) the valve 9 may open a pre-determined time after the heater 19 has been switched in; (b) valve 12 may be closed either a pre-determined time after valve 9 has been opened, or in response to an increased pressure in container 13 ; (c) opening of valve 16, closing of valve 9 and re-opening of valve 12 may be time-controlled to occur a predetermined period after the opening of valve 9, this period being sufficient for the moulded sheet to cool and solidify. The mould may be concave, as shown, or convex.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH786416X | 1955-10-05 | ||
| CH1160398X | 1955-10-05 | ||
| CH2911677X | 1955-10-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB786416A true GB786416A (en) | 1957-11-20 |
Family
ID=27178588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30455/56A Expired GB786416A (en) | 1955-10-05 | 1956-10-05 | Improvements in and relating to vacuum deep-drawing of thermoplastic sheet material |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH332587A (en) |
| GB (1) | GB786416A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3130451A (en) * | 1961-02-02 | 1964-04-28 | Avery Ind Inc | Drape frame assembly |
| US3504070A (en) * | 1968-02-19 | 1970-03-31 | Comet Ind | Vacuum forming method and apparatus |
| GB2248579A (en) * | 1990-10-09 | 1992-04-15 | William John Craske | A vacuum forming machine in which vacuum is automatically initiated upon delivery of the sheet to the machine |
| WO2013157924A1 (en) * | 2012-04-17 | 2013-10-24 | Biserkon Holdings Ltd. | Capsule and device for preparing beverages and method for manufacturing a capsule |
| US9169033B2 (en) | 2010-05-06 | 2015-10-27 | Multivac Sepp Haggenmuller Gmbh & Co. Kg | Sealing station for a packaging machine |
| CN112174499A (en) * | 2020-09-30 | 2021-01-05 | 昆山工研院新型平板显示技术中心有限公司 | Forming method and forming device for curved cover plate |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005061315A1 (en) * | 2005-12-20 | 2007-06-21 | Cfs Germany Gmbh | Packaging machine with a thermoforming station with a claw vacuum pump |
-
1955
- 1955-10-05 CH CH332587D patent/CH332587A/en unknown
-
1956
- 1956-10-05 GB GB30455/56A patent/GB786416A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3130451A (en) * | 1961-02-02 | 1964-04-28 | Avery Ind Inc | Drape frame assembly |
| US3504070A (en) * | 1968-02-19 | 1970-03-31 | Comet Ind | Vacuum forming method and apparatus |
| GB2248579A (en) * | 1990-10-09 | 1992-04-15 | William John Craske | A vacuum forming machine in which vacuum is automatically initiated upon delivery of the sheet to the machine |
| US9169033B2 (en) | 2010-05-06 | 2015-10-27 | Multivac Sepp Haggenmuller Gmbh & Co. Kg | Sealing station for a packaging machine |
| WO2013157924A1 (en) * | 2012-04-17 | 2013-10-24 | Biserkon Holdings Ltd. | Capsule and device for preparing beverages and method for manufacturing a capsule |
| CN112174499A (en) * | 2020-09-30 | 2021-01-05 | 昆山工研院新型平板显示技术中心有限公司 | Forming method and forming device for curved cover plate |
| CN112174499B (en) * | 2020-09-30 | 2024-05-24 | 昆山工研院新型平板显示技术中心有限公司 | Forming method of curved surface cover plate |
Also Published As
| Publication number | Publication date |
|---|---|
| CH332587A (en) | 1958-09-15 |
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