GB977473A - Improvements in and relating to the manufacture of biaxially stretched tubular films - Google Patents

Improvements in and relating to the manufacture of biaxially stretched tubular films

Info

Publication number
GB977473A
GB977473A GB19852/61A GB1985261A GB977473A GB 977473 A GB977473 A GB 977473A GB 19852/61 A GB19852/61 A GB 19852/61A GB 1985261 A GB1985261 A GB 1985261A GB 977473 A GB977473 A GB 977473A
Authority
GB
United Kingdom
Prior art keywords
tube
mandrel
biaxially stretched
pressure
extrusion orifice
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
GB19852/61A
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.)
Kalle GmbH and Co KG
Original Assignee
Kalle GmbH and Co KG
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
Priority claimed from DEK40872A external-priority patent/DE1239839B/en
Application filed by Kalle GmbH and Co KG filed Critical Kalle GmbH and Co KG
Publication of GB977473A publication Critical patent/GB977473A/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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/22—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes
    • B29C55/26—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes biaxial
    • 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
    • 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
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • 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
    • B29C48/91—Heating, e.g. for cross linking
    • 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
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/005—Oriented
    • B29K2995/0053—Oriented bi-axially

Abstract

977,473. Biaxially stretched tubular films. KALLE A.G. June 1, 1961 [June 1, 1960], No. 19862/61. Heading B5B. Biaxially stretched tubular organic thermoplastic film is continuously produced by extruding the heated film-forming material through the annular extrusion orifice of a die 2 (Fig. 1) to form a tube 1 which is solidified by drawing it over and in contact with an internally cooled metal mandrel 3 having a diameter greater than that of the extrusion orifice by means of endless conveyer belt tube advancing device 7. The tube is then drawn through a cylindrical passageway in a device 4 by means of which the temperature of the tube is raised to a stretching temperature below the crystallite melting point of the tube material while externally confined by the passageway and at the same time subjected to internal gas pressure by gas at a pressure slightly above atmospheric introduced into the tube by the pipe 8. The tube is withdrawn from the device 4 and longitudinally stretched by a pair of nip rollers 6 and simultaneously inflated and thereby transversely stretched during its unconfined travel from the heating device 4 to the two converging rows of rotatable rollers to form a tubular film 5. If the pressure with which the tube bears against the mandrel 3 is not sufficient to prevent pressurized air from flowing between the tube and the mandrel towards the extrusion orifice, an internal resilient cylindrical sealing element which is coaxial with the mandrel and fitted to an extension of the front of the mandrel may be provided. The process of the invention permits of the conversion of tubes of relatively high wall thickness into tubular films by biaxial stretching at high stretch ratios when the thermoplastic film material is of such a nature as to require the employment of high biaxial stretching ratios, e.g. low-pressure polyethylene and polypropylene.
GB19852/61A 1960-06-01 1961-06-01 Improvements in and relating to the manufacture of biaxially stretched tubular films Expired GB977473A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK40872A DE1239839B (en) 1960-06-01 1960-06-01 Process for the continuous production of biaxially stretched tubular films

Publications (1)

Publication Number Publication Date
GB977473A true GB977473A (en) 1964-12-09

Family

ID=7222211

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19852/61A Expired GB977473A (en) 1960-06-01 1961-06-01 Improvements in and relating to the manufacture of biaxially stretched tubular films

Country Status (1)

Country Link
GB (1) GB977473A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3671617A (en) * 1968-11-30 1972-06-20 Mitsubishi Petrochemical Co Method of drawing thermoplastic synthetic resin film over a polyangular mandrel
US10744697B2 (en) 2014-02-19 2020-08-18 Redetec Inc. Apparatus for extruding plastic materials

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3671617A (en) * 1968-11-30 1972-06-20 Mitsubishi Petrochemical Co Method of drawing thermoplastic synthetic resin film over a polyangular mandrel
US10744697B2 (en) 2014-02-19 2020-08-18 Redetec Inc. Apparatus for extruding plastic materials

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