GB1045324A - Improvements in the production of heat-shrinkable thermoplastic tubing - Google Patents

Improvements in the production of heat-shrinkable thermoplastic tubing

Info

Publication number
GB1045324A
GB1045324A GB1699/64A GB169964A GB1045324A GB 1045324 A GB1045324 A GB 1045324A GB 1699/64 A GB1699/64 A GB 1699/64A GB 169964 A GB169964 A GB 169964A GB 1045324 A GB1045324 A GB 1045324A
Authority
GB
United Kingdom
Prior art keywords
tubing
orifice
annular
inch
extrusion
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
GB1699/64A
Inventor
Frank Baynham Cross
David Thomas Jones
George Edward Jowett
William Ellwood Storer
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.)
Viscose Development Co Ltd
Original Assignee
Viscose Development Co 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 Viscose Development Co Ltd filed Critical Viscose Development Co Ltd
Priority to GB1699/64A priority Critical patent/GB1045324A/en
Priority to SE1872/65A priority patent/SE303039B/xx
Priority to NL6501799A priority patent/NL6501799A/xx
Priority to DK75965AA priority patent/DK111340B/en
Publication of GB1045324A publication Critical patent/GB1045324A/en
Expired legal-status Critical Current

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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06—Making preforms having internal stresses, e.g. plastic memory
    • B29C61/08—Making preforms having internal stresses, e.g. plastic memory by stretching tubes
    • 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

  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

1,045,324. Tubular films. VISCOSE DEVELOPMENT CO. Ltd. Feb. 4, 1965 [Feb. 14, 1964], No. 1699/64. Heading B5B. Heat-shrinkable tubing is made from a thermoplastic polymer which is extruded in molten form from an annular extrusion orifice 2, the tubing being drawn from the orifice by a pair of nip rollers 8, that portion of the tubing located between the extrusion die 1 and the nip rollers 8 being inflated by means of air introduced into the tubing through a nozzle 3 in the extrusion die, and the tubing being so cooled by means of an annular jet of chilled air 7 directed on to the tubing immediately adjacent the extrusion orifice, in a direction away from the orifice, that inflation of the tubing takes place within a temperature range such that the stretching of the tubing imparts heat-shrinkability to the tubing. Chilled air is supplied at inlets 5 to coaxial annular nozzle 4 which has internal diffusion baffles 6, and leaves via annular orifice 7. Preferably, the annular orifice is not more than ¢inch from the extrusion orifice and the annular air jet, suitably of internal diameter approximately 1 inch, forms an angle of 25 to 50 degrees with the longitudinal axis of the tube. The gap at the extrusion orifice may be in the region of 0.025 inch, and the external diameter thereof 1/4 to <SP>5</SP>/16 inch. The diameter of the finished tubing may be less than 6 inches, and the wall thickness less than 0À004 inch. Blow ratios (i.e. ratio of initial to final diameter of tubing) of 2 : 1 to 10 : 1, especially 4 : 1 to 6 : 1, may be used, the shrinkability of the film in the transverse direction being at least 25%. Air jet temperatures are suitably less than 10‹ C. Polyvinyl chloride may be extruded at a melt temperature of 165-180‹ C., and polystyrene at 140-150‹ C.
GB1699/64A 1964-02-14 1964-02-14 Improvements in the production of heat-shrinkable thermoplastic tubing Expired GB1045324A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB1699/64A GB1045324A (en) 1964-02-14 1964-02-14 Improvements in the production of heat-shrinkable thermoplastic tubing
SE1872/65A SE303039B (en) 1964-02-14 1965-02-12
NL6501799A NL6501799A (en) 1964-02-14 1965-02-12
DK75965AA DK111340B (en) 1964-02-14 1965-02-12 Process for producing a tubular film of thermoplastic plastic.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1699/64A GB1045324A (en) 1964-02-14 1964-02-14 Improvements in the production of heat-shrinkable thermoplastic tubing

Publications (1)

Publication Number Publication Date
GB1045324A true GB1045324A (en) 1966-10-12

Family

ID=9726494

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1699/64A Expired GB1045324A (en) 1964-02-14 1964-02-14 Improvements in the production of heat-shrinkable thermoplastic tubing

Country Status (4)

Country Link
DK (1) DK111340B (en)
GB (1) GB1045324A (en)
NL (1) NL6501799A (en)
SE (1) SE303039B (en)

Also Published As

Publication number Publication date
NL6501799A (en) 1965-08-16
SE303039B (en) 1968-08-12
DK111340B (en) 1968-07-29

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