GB1008404A - Process for the manufacture of tubular thermoplastic films - Google Patents

Process for the manufacture of tubular thermoplastic films

Info

Publication number
GB1008404A
GB1008404A GB36895/61A GB3689561A GB1008404A GB 1008404 A GB1008404 A GB 1008404A GB 36895/61 A GB36895/61 A GB 36895/61A GB 3689561 A GB3689561 A GB 3689561A GB 1008404 A GB1008404 A GB 1008404A
Authority
GB
United Kingdom
Prior art keywords
tube
temperature
wall
point
melting point
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
GB36895/61A
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.)
Hoechst AG
Original Assignee
Hoechst AG
Farbwerke Hoechst AG
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 Hoechst AG, Farbwerke Hoechst AG filed Critical Hoechst AG
Publication of GB1008404A publication Critical patent/GB1008404A/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
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • 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

Abstract

1,008,404. Films. FARBWERKE HOECHST A.G. Oct. 13, 1961 [Oct. 13, 1960], No. 36895/ 61. Addition to 849,466. Drawings to Specification. Heading B5B. In a process for the manufacture of films of artificial thermoplastic material wherein a heated tube of artificial thermoplastic material is disteneded by the application of internal pressure to form a tube of larger diameter while the zone of transistion between the narrower and wider portions of the tube is in an elastic state, during the distention at least two concentric annular portions of at least a part of the wall of the tube in the zone of transition are so heated that a temperature gradient or gradients are created across the said part of the wall, at least one of said concentric portions being heated to a temperature within a range extending from the crystallite melting point or softening point of the thermoplastic material to 60‹ C. below the said point and at least one other of the said concentric portions being in the molten state at a temperature within a range extending from a temperature slightly below the crystallite melting point or softening point to a temperature above the said point, and the wider portion of the tube is maintained in its distended state while being cooled. Specified materials include polyolefins, e.g. polyethylene and polypropylene, polymers of olefins of high molecular weight, polyfluoroethylenes and polyvinyl chloride. The concentric portion of the wall of the tube that is in the molten state may have a temperature not more than 60‹ C. above the crystallite melting point or softening point. Either the outer part of the wall of the tube or the inner part of the wall of the tube or both may be heated to a temperature above the crystallite melting point and the remainder of the wall of the tube may be maintained at a temperature within a range extending from the crystallite melting point or softening point to 60‹ C. below the said point. Alternatively, an annular portion of the wall of a tube issuing from an extruder in the molten state may be cooled to a temperature within a range extending from the crystallite melting point or softening point to 60‹ C. below the said point. Heating of the film may be effected by passage through a bath or spray of a hot liquid, or a blast of hot gas, or by radiation. Films so made have strengths from about 200-1000 kg. per sq. cm., and corresponding elongations from about 50 to several hundred per cent, e.g. 500%, the strengths and elongations of the films obtained being varied by variation of the temperature distribution across the wall of the tube. This may be achieved by varying the bath temperature or the velocity at which the tube is fed into the tempering bath or other tempering device.
GB36895/61A 1960-10-13 1961-10-13 Process for the manufacture of tubular thermoplastic films Expired GB1008404A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF32328A DE1262568B (en) 1960-10-13 1960-10-13 Process for the production of foils from macromolecular thermoplastics

Publications (1)

Publication Number Publication Date
GB1008404A true GB1008404A (en) 1965-10-27

Family

ID=7094583

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36895/61A Expired GB1008404A (en) 1960-10-13 1961-10-13 Process for the manufacture of tubular thermoplastic films

Country Status (3)

Country Link
DE (1) DE1262568B (en)
GB (1) GB1008404A (en)
NL (1) NL270255A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2100431C (en) * 1992-07-15 1997-04-15 Toshio Taka Method and apparatus for molding inflation film

Also Published As

Publication number Publication date
DE1262568B (en) 1968-03-07
NL270255A (en) 1900-01-01

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