GB1509114A - Method of flattening a thin tubular sheath of plastics material and apparatus for carrying out this method - Google Patents

Method of flattening a thin tubular sheath of plastics material and apparatus for carrying out this method

Info

Publication number
GB1509114A
GB1509114A GB22366/76A GB2236676A GB1509114A GB 1509114 A GB1509114 A GB 1509114A GB 22366/76 A GB22366/76 A GB 22366/76A GB 2236676 A GB2236676 A GB 2236676A GB 1509114 A GB1509114 A GB 1509114A
Authority
GB
United Kingdom
Prior art keywords
film
nip
flattening
extruded
pair
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
GB22366/76A
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.)
ATO Chimie SA
Original Assignee
ATO Chimie SA
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 ATO Chimie SA filed Critical ATO Chimie SA
Publication of GB1509114A publication Critical patent/GB1509114A/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
    • B29C48/03—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
    • 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

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

1509114 Flattening tubular film ATO CHIMIE 28 May 1976 [9 June 1975] 22366/76 Headings B5A and B5B A continuously extruded plastics tube, e.g. of polystyrene, or polyethylene, which is inflated into a cylindrical film or sheet, 9 Fig. 2, is guided into a flat configuration for presentation into the nip of a pair of opposed pinching rolls 16, between a pair of guides 15 having surfaces contacting the sheath and which are each defined at their downstream end adjacent the nip by a straight line 27, Fig. 4, parallel to the nip, and are defined at their upstream ends by the arc of a circle 24, and between their ends are defined by generatrix comprising straight lines 28 extending parallel to a plane 24 which contains the axis of the extruded tube and is perpendicular to the line 27. The surfaces of the guides ensure contact with the film, at their upstream ends, over a greater transverse extent than would occur with flat guide surfaces, and therefore ensure a smaller variation of frictional forces across the total transverse extent of contact and minimize the extent of wrinkles at the edges of the flattened film. The cylindrical film may be extruded vertically upwardly from a rotary die.
GB22366/76A 1975-06-09 1976-05-28 Method of flattening a thin tubular sheath of plastics material and apparatus for carrying out this method Expired GB1509114A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7517883A FR2314036A1 (en) 1975-06-09 1975-06-09 PROCESS FOR FLATTING A PLASTIC SHEATH MADE BY EXTRUSION BLOWING AND DEVICE FOR IMPLEMENTING THIS PROCESS

Publications (1)

Publication Number Publication Date
GB1509114A true GB1509114A (en) 1978-04-26

Family

ID=9156200

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22366/76A Expired GB1509114A (en) 1975-06-09 1976-05-28 Method of flattening a thin tubular sheath of plastics material and apparatus for carrying out this method

Country Status (4)

Country Link
DE (1) DE2623580A1 (en)
FR (1) FR2314036A1 (en)
GB (1) GB1509114A (en)
IT (1) IT1062172B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10115259C1 (en) * 2001-03-28 2002-10-02 Kiefel Extrusion Gmbh Air turning bar

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2322040A1 (en) * 1973-05-02 1974-11-21 Demag Ag FLAT LAYING DEVICE FOR A PLASTIC TUBE FILM

Also Published As

Publication number Publication date
IT1062172B (en) 1983-07-28
FR2314036A1 (en) 1977-01-07
DE2623580A1 (en) 1976-12-30
FR2314036B1 (en) 1977-12-09

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee