GB812387A - Film production - Google Patents
Film productionInfo
- Publication number
- GB812387A GB812387A GB15121/56A GB1512156A GB812387A GB 812387 A GB812387 A GB 812387A GB 15121/56 A GB15121/56 A GB 15121/56A GB 1512156 A GB1512156 A GB 1512156A GB 812387 A GB812387 A GB 812387A
- Authority
- GB
- United Kingdom
- Prior art keywords
- film
- heat treatment
- flattened
- heaters
- held
- 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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (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)
Abstract
<PICT:0812387/IV (a)/1> <PICT:0812387/IV (a)/2> A film of organic thermoplastic material that has been formed by extruding the material in tubular form, stretched by means of fluid pressure held within a section of the tubing, and thereafter reduced to a substantially flattened state, is treated to remove sag or creases by subjecting the film while held under tension in a substantially flattened state to a heat treatment sufficient to cause shrinkage of the film in the relaxed state. Heat treatment may be applied before winding, or during a rewinding process, and the film may be in a substantially flattened tubular form (see Fig. 2) or may be slit to form one or more lengths of flat film, as in Fig. 1. As shown, film 1 is held inflated between pairs of nip rolls 2, 3 and progressively flattened between one or two series of guide rollers 4, 9 respectively. Heat is applied by heaters 7 to the flattened tubular film in Fig. 2 or by heaters 7 and reflectors 8 to the two lengths of film 1a, 1b in Fig. 1, before the film passes to wind-up rollers 6. Where heat treatment is applied to the film in tubular form, the distance apart of the flattened tube walls is preferably no more than one tenth of the length of the major diameter of the film in this region. The film may be made of polythene, terephthalic acid linear polyesters, especially polyethylene terephthalate, vinyl polymers, for example polystyrene, polyvinyl chloride, and vinyl chloride/vinylidene chloride polymers, thermoplastic cellulose esters, or rubber hydrochloride. Preferably, heat treatment is applied by means of radiant or infra-red heaters immediately before the film is wound, and during treatment the film may be held under sufficient tension to prevent substantial overall shrinkage.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1175192X | 1956-05-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB812387A true GB812387A (en) | 1959-04-22 |
Family
ID=10879810
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB15121/56A Expired GB812387A (en) | 1956-05-15 | 1956-05-15 | Film production |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE557399A (en) |
FR (1) | FR1175192A (en) |
GB (1) | GB812387A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3313870A (en) * | 1962-05-08 | 1967-04-11 | Yazawa Masahide | Process and apparatus for two-dimensional stretching of thermoplastic film, plate and pipe |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE632525A (en) * | 1962-05-18 |
-
0
- BE BE557399D patent/BE557399A/xx unknown
-
1956
- 1956-05-15 GB GB15121/56A patent/GB812387A/en not_active Expired
-
1957
- 1957-05-15 FR FR1175192D patent/FR1175192A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3313870A (en) * | 1962-05-08 | 1967-04-11 | Yazawa Masahide | Process and apparatus for two-dimensional stretching of thermoplastic film, plate and pipe |
Also Published As
Publication number | Publication date |
---|---|
FR1175192A (en) | 1959-03-20 |
BE557399A (en) |
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