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GB1250945A - - Google Patents

Info

Publication number
GB1250945A
GB1250945A GB1250945DA GB1250945A GB 1250945 A GB1250945 A GB 1250945A GB 1250945D A GB1250945D A GB 1250945DA GB 1250945 A GB1250945 A GB 1250945A
Authority
GB
United Kingdom
Prior art keywords
film
cooling
remainder
tube
locally
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
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 filed Critical
Publication of GB1250945A publication Critical patent/GB1250945A/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
    • B29C48/0019—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)

Abstract

1,250,945. Locally thickened tubular film. VOOR TECHNO - COMMERCIELE SIGNALISATIE, IN HET KORT N.V. 16 Oct., 1969 [28 Aug., 1969], No. 50836/69. Heading B5B. A synthetic organic thermoplastic tubular film having at least one longitudinal zone of which the wall thickness is greater than that of the remainder of the film is made by melt extruding the tube from an annular die, subjecting the tube to primary cooling and inflating it, and locally cooling at least one longitudinal zone of the inflated and still plastic film to solidify this zone before cooling the remainder of the film. Cooling may be by a jet of pressurized air, the temperature and pressure of which are adjustable. Two opposite zones on the film may be cooled to equilibrate stresses.
GB1250945D 1969-08-28 1969-10-16 Expired GB1250945A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE49445 1969-08-28

Publications (1)

Publication Number Publication Date
GB1250945A true GB1250945A (en) 1971-10-27

Family

ID=3840758

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1250945D Expired GB1250945A (en) 1969-08-28 1969-10-16

Country Status (2)

Country Link
GB (1) GB1250945A (en)
IE (1) IE34177B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4443400A (en) * 1982-08-11 1984-04-17 Mobil Oil Corporation Method and apparatus for the formation of profiled thermoplastic film

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4443400A (en) * 1982-08-11 1984-04-17 Mobil Oil Corporation Method and apparatus for the formation of profiled thermoplastic film

Also Published As

Publication number Publication date
IE34177L (en) 1971-02-28
IE34177B1 (en) 1975-03-05

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees