GB1034032A - Method of making a heat-set stretched polyvinyl chloride film - Google Patents
Method of making a heat-set stretched polyvinyl chloride filmInfo
- Publication number
- GB1034032A GB1034032A GB187064A GB187064A GB1034032A GB 1034032 A GB1034032 A GB 1034032A GB 187064 A GB187064 A GB 187064A GB 187064 A GB187064 A GB 187064A GB 1034032 A GB1034032 A GB 1034032A
- Authority
- GB
- United Kingdom
- Prior art keywords
- film
- heat
- temperature
- stretched
- polyvinyl chloride
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
1,034,032. Heat-setting stretched polyvinyl chloride film. TOYO RAYON KABUSHIKI KAISHA. Jan. 15, 1964, No. 1870/64. Heading B5B. A film which consists of polyvinyl chloride or of a polymer consisting chiefly of polyvinyl chloride, and which has been formed by melt extrusion or by calendering, is stretched at a temperature above its heat distortion tempera. ture but below its melting point in either the longitudinal or the transverse direction or in both directions at a stretch ratio of not less than 2 in at least one of the directions, then heat-set under tension at a temperature within the range of from the " Critical Breaking Temperature " of the film to a temperature 20‹ C. lower than the C.B.T. and preferably at a temperature within the range of from 1‹ or 2‹ C. below and 10‹ C. below the C.B.T., followed by a second heat-setting step in which the film is relaxed in either of or both the directions to an extent within the range from 1 to 20%, at a temperature within the range of from 70‹ C. to the C.B.T. The C.B.T. is determined by holding a piece of the film in a frame in such a manner that the film is prevented from shrinking, and placing the frame in a hot air oven the temperature of which is raised at the rate of 2‹ C. per minute starting at 50‹ C. The C.B.T. is the temperature at which the film breaks. In the first heat-setting step the film is held under sufficient tension to prevent it from shrinking. In an example, a P.V.C. film meltextruded at 200‹ C. is stretched at a stretch ratio of 2À2 in the longitudinal direction at 90-95‹ C. by means of nip rolls and stretched at a stretch ratio of 2À2 in the transverse direction by means of a tenter. The critical breaking temperature of this biaxially stretched film is 134‹ C. and part of the film is heat-set under tension for 17 seconds at 130‹ C. by means of a tenter. Another part of the film is heat-set in a continuous manner under tension for 17 seconds at 130‹ C. using a continuous heat-setting apparatus comprising a set of closely spaced rolls. The portion of the film heat-set under tension at 130‹ C. using a tenter is heat set while being allowed to relax 1 to 20% at 100‹ C. and 130‹ C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB187064A GB1034032A (en) | 1964-01-15 | 1964-01-15 | Method of making a heat-set stretched polyvinyl chloride film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB187064A GB1034032A (en) | 1964-01-15 | 1964-01-15 | Method of making a heat-set stretched polyvinyl chloride film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1034032A true GB1034032A (en) | 1966-06-29 |
Family
ID=9729480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB187064A Expired GB1034032A (en) | 1964-01-15 | 1964-01-15 | Method of making a heat-set stretched polyvinyl chloride film |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1034032A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2177910A1 (en) * | 1972-03-24 | 1973-11-09 | Grace W R Ltd | |
| CN108044919A (en) * | 2017-12-08 | 2018-05-18 | 广州宏信塑胶工业有限公司 | The secondary extension process of PVC adhesive plasters and its application |
-
1964
- 1964-01-15 GB GB187064A patent/GB1034032A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2177910A1 (en) * | 1972-03-24 | 1973-11-09 | Grace W R Ltd | |
| CN108044919A (en) * | 2017-12-08 | 2018-05-18 | 广州宏信塑胶工业有限公司 | The secondary extension process of PVC adhesive plasters and its application |
| CN108044919B (en) * | 2017-12-08 | 2022-08-12 | 无锡宏义高分子材料科技有限公司 | Secondary extension process of PVC (polyvinyl chloride) adhesive tape and application thereof |
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