GB1074317A - Improvements in and relating to thermoplastic films - Google Patents
Improvements in and relating to thermoplastic filmsInfo
- Publication number
- GB1074317A GB1074317A GB46947/64A GB4694764A GB1074317A GB 1074317 A GB1074317 A GB 1074317A GB 46947/64 A GB46947/64 A GB 46947/64A GB 4694764 A GB4694764 A GB 4694764A GB 1074317 A GB1074317 A GB 1074317A
- Authority
- GB
- United Kingdom
- Prior art keywords
- film
- tube
- extruded
- lamination
- pin holes
- 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
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
Landscapes
- Laminated Bodies (AREA)
Abstract
1,074,317. Tubular films; laminates. T. J. SMITH & NEPHEW Ltd. Feb. 8, 1966 [Nov. 18, 1964], No. 46947/64. Headings B5B and B5N. A process for the production of thermoplastic films comprises extruding a thermoplastics material through an annular die, inflating the tube formed and collapsing the inflated tube between the nip rolls just before the position of the frost line to produce a laminated lay-flat film. The frost line is defined as the point when the transparent extruded material becomes translucent due to crystallization. Specified thermoplastic materials, which when at a temperature above their softening point will stick to each other when pressed together include polyethylene, polypropylene, polyvinylchloride, ethylene/ vinyl acetate copolymers and polyvinylidene chloride. The rate of cooling of the film may be controlled by the temperature of the gas used to form the bubble, which should be high enough to allow the extruded film to expand to the required diameter before the nipping together and resulting lamination. The pressure of the gas may also be adjustable for this purpose and if required the nip rolls may be heated. Preferably the nip rolls are formed from or coated with a non-adherent material, for example polytetrafluoroethylene. The temperature of the atmosphere around the exterior of the extruded tube may be controlled so that the cooling of the tube is slowed down, and this may suitably be effected by the provision of shields around the exterior of the extruded film. In operation, the two internal contacting surfaces of the flattened bubble of film are so hot when they contact each other that the resulting laminated film is free from pin holes extending right through from one side to the other, it being extremely unlikely that any pin holes present in one lamination will coincide with pin holes in the other lamination.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB46947/64A GB1074317A (en) | 1964-11-18 | 1964-11-18 | Improvements in and relating to thermoplastic films |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB46947/64A GB1074317A (en) | 1964-11-18 | 1964-11-18 | Improvements in and relating to thermoplastic films |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1074317A true GB1074317A (en) | 1967-07-05 |
Family
ID=10443171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB46947/64A Expired GB1074317A (en) | 1964-11-18 | 1964-11-18 | Improvements in and relating to thermoplastic films |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1074317A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2363117A1 (en) * | 1973-12-19 | 1975-06-26 | Hoechst Ag | METHOD AND DEVICE FOR THE PRODUCTION OF FILMS |
US7063764B1 (en) * | 1999-11-05 | 2006-06-20 | Nuova Pansac S.P.A. | Apparatus and method for producing a polyolefinic transpiring film |
US7219484B2 (en) | 2001-01-26 | 2007-05-22 | Reckitt Benckiser (Uk) Limited | Process for preparing a laminated, thermoformed film |
-
1964
- 1964-11-18 GB GB46947/64A patent/GB1074317A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2363117A1 (en) * | 1973-12-19 | 1975-06-26 | Hoechst Ag | METHOD AND DEVICE FOR THE PRODUCTION OF FILMS |
US7063764B1 (en) * | 1999-11-05 | 2006-06-20 | Nuova Pansac S.P.A. | Apparatus and method for producing a polyolefinic transpiring film |
US7219484B2 (en) | 2001-01-26 | 2007-05-22 | Reckitt Benckiser (Uk) Limited | Process for preparing a laminated, thermoformed film |
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