GB1074317A - Improvements in and relating to thermoplastic films - Google Patents

Improvements in and relating to thermoplastic films

Info

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
Application number
GB46947/64A
Inventor
Edward Henry Harbard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TJ Smith and Nephew Ltd
Original Assignee
TJ Smith and Nephew Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TJ Smith and Nephew Ltd filed Critical TJ Smith and Nephew Ltd
Priority to GB46947/64A priority Critical patent/GB1074317A/en
Publication of GB1074317A publication Critical patent/GB1074317A/en
Expired legal-status Critical Current

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.
GB46947/64A 1964-11-18 1964-11-18 Improvements in and relating to thermoplastic films Expired GB1074317A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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