GB751068A - Improvements in a process for blow molding thermoplastic hollow articles and in a device for heating the thermoplastic material - Google Patents
Improvements in a process for blow molding thermoplastic hollow articles and in a device for heating the thermoplastic materialInfo
- Publication number
- GB751068A GB751068A GB2246654A GB2246654A GB751068A GB 751068 A GB751068 A GB 751068A GB 2246654 A GB2246654 A GB 2246654A GB 2246654 A GB2246654 A GB 2246654A GB 751068 A GB751068 A GB 751068A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pattern
- sheet
- parts
- plate
- heat
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Before a sheet of, e.g. cellulose or vinyl acetate, or polyethylene, is blow-moulded it is held in contact with the surface of a heated plate which surface has heat retarding means arranged in a pattern such that some parts of the sheet are heated more than others. Insofar as the shape of the mould is non-spherical some parts of the sheet, when expanded, tend to stretch more than others, but if the parts which will be more stretched during moulding are preheated to lower temperatures, and those less stretched to higher, a more uniform final thickness results and thinner sheet material can be used. One way of arranging the heat retarding pattern is to stick patches of heating insulating material, e.g. of paper, of appropriate shape, on the surface of the plate. Another way is to cut recesses in the surface of appropriately varying depth and fill them with suitable cement, e.g. a mixture of ground mica and epoxy resin. A third way is to cut thin grooves in the surface of a depth inversely proportional to the desired rate of heat transfer from the plate. The required pattern of the heat retarding means is obtained by making a sample moulding, with the plate uniformly heated. If the plastic material is one with an elastic memory the thin parts are marked and the material is shrunk back, by heating, to its original form when it forms a template which can be followed in forming the heat retarding pattern. If the material does not have an elastic memory a grid pattern is marked on the sample sheet before moulding, enabling each portion of the moulded article to be properly related to its original location on the flat blank and a suitable heat retarding pattern to be designed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2246654A GB751068A (en) | 1954-08-03 | 1954-08-03 | Improvements in a process for blow molding thermoplastic hollow articles and in a device for heating the thermoplastic material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2246654A GB751068A (en) | 1954-08-03 | 1954-08-03 | Improvements in a process for blow molding thermoplastic hollow articles and in a device for heating the thermoplastic material |
Publications (1)
Publication Number | Publication Date |
---|---|
GB751068A true GB751068A (en) | 1956-06-27 |
Family
ID=10179817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2246654A Expired GB751068A (en) | 1954-08-03 | 1954-08-03 | Improvements in a process for blow molding thermoplastic hollow articles and in a device for heating the thermoplastic material |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB751068A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1162062B (en) * | 1958-07-26 | 1964-01-30 | Gerhardi & Cie | Process for producing tub-shaped bodies, such as lamp housings, from thermoplastic material |
US3181202A (en) * | 1961-06-20 | 1965-05-04 | Nest Pack Spa | Rotary machine for the combined automatic vacuum- and pressure-forming of continuous thermoplastic bands |
DE1192812B (en) * | 1958-12-12 | 1965-05-13 | Hedwin Corp | Method and device for manufacturing hollow bodies with alternating wall sections of different thickness |
US3471601A (en) * | 1964-08-07 | 1969-10-07 | Civile N G T Soc | Process for the manufacture of articles from plastics material or having at least one plastic state |
US3484518A (en) * | 1965-11-09 | 1969-12-16 | Sobrefina Sa | Method of and apparatus for the manufacture of objects from plastic material by pressure and/or vacuum forming operations |
DE2150028A1 (en) * | 1971-09-28 | 1973-04-12 | Owens Illinois Inc | METHOD AND DEVICE FOR MOLDING ARTICLES FROM PRINTED PLASTIC SHEETS |
EP0055082A2 (en) * | 1980-12-18 | 1982-06-30 | The British Petroleum Company p.l.c. | Thermoformed articles |
GB2225276A (en) * | 1988-10-31 | 1990-05-30 | Tomy Co Ltd | Moulding a decorated resin plate into a decorated toy body |
US5290490A (en) * | 1990-06-29 | 1994-03-01 | General Electric Company | Method and apparatus for differentially heating and thermoforming a polymer sheet |
-
1954
- 1954-08-03 GB GB2246654A patent/GB751068A/en not_active Expired
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1162062B (en) * | 1958-07-26 | 1964-01-30 | Gerhardi & Cie | Process for producing tub-shaped bodies, such as lamp housings, from thermoplastic material |
DE1192812B (en) * | 1958-12-12 | 1965-05-13 | Hedwin Corp | Method and device for manufacturing hollow bodies with alternating wall sections of different thickness |
US3181202A (en) * | 1961-06-20 | 1965-05-04 | Nest Pack Spa | Rotary machine for the combined automatic vacuum- and pressure-forming of continuous thermoplastic bands |
US3471601A (en) * | 1964-08-07 | 1969-10-07 | Civile N G T Soc | Process for the manufacture of articles from plastics material or having at least one plastic state |
US3484518A (en) * | 1965-11-09 | 1969-12-16 | Sobrefina Sa | Method of and apparatus for the manufacture of objects from plastic material by pressure and/or vacuum forming operations |
DE2150028A1 (en) * | 1971-09-28 | 1973-04-12 | Owens Illinois Inc | METHOD AND DEVICE FOR MOLDING ARTICLES FROM PRINTED PLASTIC SHEETS |
EP0055082A2 (en) * | 1980-12-18 | 1982-06-30 | The British Petroleum Company p.l.c. | Thermoformed articles |
EP0055082A3 (en) * | 1980-12-18 | 1983-06-01 | The British Petroleum Company p.l.c. | Thermoformed articles |
GB2225276A (en) * | 1988-10-31 | 1990-05-30 | Tomy Co Ltd | Moulding a decorated resin plate into a decorated toy body |
US5290490A (en) * | 1990-06-29 | 1994-03-01 | General Electric Company | Method and apparatus for differentially heating and thermoforming a polymer sheet |
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