GB828851A - Improvements in or relating to the manufacture of thin-walled tubing from thermoplastic materials - Google Patents

Improvements in or relating to the manufacture of thin-walled tubing from thermoplastic materials

Info

Publication number
GB828851A
GB828851A GB92/57A GB9257A GB828851A GB 828851 A GB828851 A GB 828851A GB 92/57 A GB92/57 A GB 92/57A GB 9257 A GB9257 A GB 9257A GB 828851 A GB828851 A GB 828851A
Authority
GB
United Kingdom
Prior art keywords
gas
tube
die
fan
towards
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
GB92/57A
Inventor
Dennis Alexander John Noble
John Alfred Victor White
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.)
British Cellophane Ltd
Original Assignee
British Cellophane 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 British Cellophane Ltd filed Critical British Cellophane Ltd
Priority to GB92/57A priority Critical patent/GB828851A/en
Publication of GB828851A publication Critical patent/GB828851A/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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • B29C48/9125—Cooling of hollow articles of tubular films internally
    • 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
    • B29C48/03—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
    • 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
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92971—Fluids, e.g. for temperature control or of environment

Abstract

<PICT:0828851/IV (a)/1> <PICT:0828851/IV (a)/2> <PICT:0828851/IV (a)/3> In the extrusion of thermoplastic material through a die to form a seamless tube by a process in which the tube is expanded by means of entrapped gas and later collapsed, the tube is cooled below its setting temperature between the die and the point of collapse by continuously cooling the entrapped gas and continuously circulating the gas within the tube in such a path that it is directed on to the internal surface of the tube. The gas may be air, and the thermoplastic material may be polyethylene, polystyrene, nylon, polyvinyl chloride, vinyl chloride copolymers, vinylidene chloride copolymers, cellulose acetate, cellulose acetate-butyrate, ethyl cellulose, methyl methacrylate polymers, or polyvinyl-formal, -acetal or -butyral. The gas may be cooled while passing about the longitudinal axis of the tube-and may be so circulated that the thermo, plastic material sets within the first third of the path of travel of the tube from the die to the point of collapse. Preferably, the gas is so circulated that it passes about the longitudinal axis of the tube towards the die, is directed radially outwards towards the internal surface of the tube, is passed along the internal surface of the tube away from the die, and is then drawn inwardly, in a converging manner, towards the axis of the tube for recirculation. As shown, suitable apparatus comprises a die 1 having an annular extrusion orifice 2 supplied with thermoplastic material via inlet 5 and ring passage 4, a gas inlet 18 fitted with valve 19, a pair of nip rollers (not shown) spaced from the die orifice to draw the tube therefrom and collapse it, a gas circulating device and a gas cooling device. The circulating device may be a fan 11 driven by an electric motor 10, mounted between the die and the open-ended cylinder 9, so as to draw the gas through the cylinder and the perforated plate 8 and ring plate 7 towards the fan. The fan assembly is supported by the table 6. The fan may be of the centrifugal type having spaced around its periphery a number of stationary gas deflectors 13 so set that they tend to strip the gas from the fan and direct it radially outwards, or an impeller type fan 23 ((Fig. 3) may be used in conjunction with a peaked deflecting surface 24. The cooling device may be placed at the open end of the cylinder remote from the fan so as to cool the gas drawn towards the fan, and may consist of a grid of pipes 14 fitted with fins 15 and having inlet and outlet supply pipes 16, 17 carrying a cooling fluid. Specifications 654,550 and 716,160 are referred to.
GB92/57A 1957-01-01 1957-01-01 Improvements in or relating to the manufacture of thin-walled tubing from thermoplastic materials Expired GB828851A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB92/57A GB828851A (en) 1957-01-01 1957-01-01 Improvements in or relating to the manufacture of thin-walled tubing from thermoplastic materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB92/57A GB828851A (en) 1957-01-01 1957-01-01 Improvements in or relating to the manufacture of thin-walled tubing from thermoplastic materials

Publications (1)

Publication Number Publication Date
GB828851A true GB828851A (en) 1960-02-24

Family

ID=9698263

Family Applications (1)

Application Number Title Priority Date Filing Date
GB92/57A Expired GB828851A (en) 1957-01-01 1957-01-01 Improvements in or relating to the manufacture of thin-walled tubing from thermoplastic materials

Country Status (1)

Country Link
GB (1) GB828851A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3329999A (en) * 1965-08-16 1967-07-11 Nat Distillers Chem Corp Internal air ring
US3445891A (en) * 1965-10-27 1969-05-27 Jon Thordarson Apparatus for manufacturing film from thermoplastic resinous film-forming materials
EP1093154A2 (en) * 1999-10-13 2001-04-18 Applied Materials, Inc. Magnetron with cooling system for substrate processing system
EP1890859A1 (en) * 2005-06-15 2008-02-27 Oy KWH Pipe AB Method and device for internal cooling of extruded thermoplastics pipes

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3329999A (en) * 1965-08-16 1967-07-11 Nat Distillers Chem Corp Internal air ring
US3445891A (en) * 1965-10-27 1969-05-27 Jon Thordarson Apparatus for manufacturing film from thermoplastic resinous film-forming materials
EP1093154A2 (en) * 1999-10-13 2001-04-18 Applied Materials, Inc. Magnetron with cooling system for substrate processing system
EP1093154A3 (en) * 1999-10-13 2001-07-04 Applied Materials, Inc. Magnetron with cooling system for substrate processing system
EP1890859A1 (en) * 2005-06-15 2008-02-27 Oy KWH Pipe AB Method and device for internal cooling of extruded thermoplastics pipes
EP1890859A4 (en) * 2005-06-15 2011-08-24 Kwh Pipe Ab Oy Method and device for internal cooling of extruded thermoplastics pipes
US8062013B2 (en) 2005-06-15 2011-11-22 Oy Kwh Pipe Ab Device for internal cooling of extruded thermoplastics pipes

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