GB1338324A - Process for thermal-forming biaxially stretched thermoplastic resin sheet - Google Patents
Process for thermal-forming biaxially stretched thermoplastic resin sheetInfo
- Publication number
- GB1338324A GB1338324A GB3166671A GB3166671A GB1338324A GB 1338324 A GB1338324 A GB 1338324A GB 3166671 A GB3166671 A GB 3166671A GB 3166671 A GB3166671 A GB 3166671A GB 1338324 A GB1338324 A GB 1338324A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sheet
- heated
- blown
- produce
- plates
- 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
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
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/42—Heating or cooling
- B29C51/421—Heating or cooling of preforms, specially adapted for thermoforming
- B29C51/422—Heating or cooling of preforms, specially adapted for thermoforming to produce a temperature differential
-
- 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
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
- B29B13/023—Half-products, e.g. films, plates
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/06—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam for articles of indefinite length
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/045—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
1338324 Sheet forming ASAHI-DOW Ltd 6 July 1971 [8 July 1970] 31666/71 Heading B5A Hot air is blown through a perforated plate on to a biaxially oriented thermoplastics sheet s to produce many small regions a heated more rapidly at their centres b than their peripheries c, Fig. 5, so that thermal shrinkage occurs preferentially in the centres b to produce the section of Fig. 6, thereby reducing the tendency of thinner areas A of the sheet, Fig. 4, to become even thinner due to their greater temperature rise compared with thicker areas B when equally heated. In the embodiment, Fig. 9, a sheet of polystyrene, P.V.C., polythene or polypropylene S is moved intermittently through two insulated ovens I and II and a blow moulding station III by regulating rollers 10 and chain conveyers 11 which support the sheet along the edges. The sheet is preheated to 70‹ C. in oven I by air blown on to both sides of the sheet through the perforated plates 14-1, 14-2 of chambers 13-1, 13-1 and recirculated through ducts 18, 23 past heater 20 by blower 19. The sheet is heated to 130‹ C. in a similar manner in oven II, the plates 32-1, 32-2 having holes arranged to produce the many heated regions a. At the forming station III the heated sheet is clamped between pneumatically moved plates 34, 35 and plugs 39 are pneumatically moved into mould 40 as compressed air is blown in to form cup-shaped articles.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5911870A JPS4947907B1 (en) | 1970-07-08 | 1970-07-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1338324A true GB1338324A (en) | 1973-11-21 |
Family
ID=13104064
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3166671A Expired GB1338324A (en) | 1970-07-08 | 1971-07-06 | Process for thermal-forming biaxially stretched thermoplastic resin sheet |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS4947907B1 (en) |
CA (1) | CA953867A (en) |
DE (1) | DE2134108A1 (en) |
FR (1) | FR2100875B1 (en) |
GB (1) | GB1338324A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2628582A1 (en) * | 2012-02-14 | 2013-08-21 | Maschinen Witte GmbH + Co.KG | Heating device for elongated workpieces |
EP3871856A1 (en) * | 2020-02-27 | 2021-09-01 | Essilor International | A thermoforming machine and method |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2743184C3 (en) * | 1977-09-26 | 1981-03-12 | Osoboe opytno-konstruktorskoe bjuro po razvitiju mechanopnevmatičeskoj technologii pererabotki listovych termoplastov, Leningrad | Device for the production of objects from sheet-shaped thermoplastic material with a heating device for this, which consists of two air boxes |
US4520575A (en) * | 1983-11-25 | 1985-06-04 | Cincinnati Milacron Inc. | Impingement oven and method |
US5571473A (en) * | 1989-12-28 | 1996-11-05 | Idemitsu Petrochemical Co., Ltd. | Process for thermoforming thermoplastic resin sheet |
US5290490A (en) * | 1990-06-29 | 1994-03-01 | General Electric Company | Method and apparatus for differentially heating and thermoforming a polymer sheet |
-
1970
- 1970-07-08 JP JP5911870A patent/JPS4947907B1/ja active Pending
-
1971
- 1971-07-06 GB GB3166671A patent/GB1338324A/en not_active Expired
- 1971-07-07 CA CA117,600A patent/CA953867A/en not_active Expired
- 1971-07-08 FR FR7124965A patent/FR2100875B1/fr not_active Expired
- 1971-07-08 DE DE19712134108 patent/DE2134108A1/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2628582A1 (en) * | 2012-02-14 | 2013-08-21 | Maschinen Witte GmbH + Co.KG | Heating device for elongated workpieces |
EP3871856A1 (en) * | 2020-02-27 | 2021-09-01 | Essilor International | A thermoforming machine and method |
WO2021170704A1 (en) * | 2020-02-27 | 2021-09-02 | Essilor International | A thermoforming machine and method |
Also Published As
Publication number | Publication date |
---|---|
FR2100875A1 (en) | 1972-03-24 |
DE2134108A1 (en) | 1972-03-09 |
CA953867A (en) | 1974-09-03 |
FR2100875B1 (en) | 1974-08-19 |
JPS4947907B1 (en) | 1974-12-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |