GB702810A - Method for preshrinking crystalline vinylidene chloride copolymer film - Google Patents
Method for preshrinking crystalline vinylidene chloride copolymer filmInfo
- Publication number
- GB702810A GB702810A GB554552A GB554552A GB702810A GB 702810 A GB702810 A GB 702810A GB 554552 A GB554552 A GB 554552A GB 554552 A GB554552 A GB 554552A GB 702810 A GB702810 A GB 702810A
- Authority
- GB
- United Kingdom
- Prior art keywords
- film
- rollers
- temperature
- vinylidene chloride
- chloride copolymer
- 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
- 229920001577 copolymer Polymers 0.000 title 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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Film of oriented crystalline vinylidene chloride copolymer is treated to prevent heat shrinking by passing it over four smooth rollers, at least the second and third of which are independently heated to a temperature between 200 DEG F. and 265 DEG F., the temperature of the first roller being below 185 DEG F. and that of the fourth roller up to 240 DEG F. but below that of the second and third rollers, and the total contact time between the film and the heated surfaces being between 1.5 and 20 seconds. The film is maintained under sufficient tension to keep it wrinkle-free but insufficient to stretch it. As the film shrinks during treatment, the third and fourth rollers may be driven at speeds down to 85 per cent. of those of the first and second rollers. After the treatment, the film has a shrinkage of less than 5 per cent. in either major dimension when subjected to a temperature of 212 DEG F. for 10 minutes. Specifications 532,697 and 656,735 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB554552A GB702810A (en) | 1952-03-03 | 1952-03-03 | Method for preshrinking crystalline vinylidene chloride copolymer film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB554552A GB702810A (en) | 1952-03-03 | 1952-03-03 | Method for preshrinking crystalline vinylidene chloride copolymer film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB702810A true GB702810A (en) | 1954-01-20 |
Family
ID=9798175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB554552A Expired GB702810A (en) | 1952-03-03 | 1952-03-03 | Method for preshrinking crystalline vinylidene chloride copolymer film |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB702810A (en) |
-
1952
- 1952-03-03 GB GB554552A patent/GB702810A/en not_active Expired
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