GB843320A - Process and apparatus for the extrusion of thermoplastic material - Google Patents

Process and apparatus for the extrusion of thermoplastic material

Info

Publication number
GB843320A
GB843320A GB21483/58A GB2148358A GB843320A GB 843320 A GB843320 A GB 843320A GB 21483/58 A GB21483/58 A GB 21483/58A GB 2148358 A GB2148358 A GB 2148358A GB 843320 A GB843320 A GB 843320A
Authority
GB
United Kingdom
Prior art keywords
temperature
film
orifice
portions
annular
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
GB21483/58A
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.)
Lonza Electric and Chemical Works Ltd
Original Assignee
Lonza Electric and Chemical Works 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 Lonza Electric and Chemical Works Ltd filed Critical Lonza Electric and Chemical Works Ltd
Publication of GB843320A publication Critical patent/GB843320A/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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • 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
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/06—PVC, i.e. polyvinylchloride
    • 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
    • B29K2995/0072—Roughness, e.g. anti-slip
    • 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
    • B29K2995/0072—Roughness, e.g. anti-slip
    • B29K2995/0073—Roughness, e.g. anti-slip smooth

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

<PICT:0843320/IV(a)/1> Tubular films are made by forcing a thermoplastic material at a first temperature high enough to keep the material plastic through an annular channel, and extruding the tubular film so formed under pressure and without changing its dimensions through an annular orifice, the surface of the film being subjected, without changing its dimensions, to a second temperature higher than the first temperature immediately before the film is forced out of the orifice. Preferably, the surface of the film is subjected to a second temperature 1-25%, especially 2-10%, higher than the first temperature for a period of 0,01-10 secs, especially 0,1 to 2 secs. Apparatus as shown comprises an extrusion head 1 having extrusion die means with successively arranged first and second portions communicating together, the first portion forming a tapered annular channel 4 and the second portion forming an annular surface with cylindrical walls 5 having heating means 8, 9, extending only immediately adjacent to the outlet of the orifice, for additionally heating the outermost end of the cylindrical walls to a temperature higher than that of the first portion. Interposed between the first and second portions may be a third portion having a smaller cross-sectional area than that of the first and second portions, (note grooves 10, 11, in parts 6, 7), whereby the flow of heat from the second portion to the first portion is limited.
GB21483/58A 1957-07-09 1958-07-04 Process and apparatus for the extrusion of thermoplastic material Expired GB843320A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH843320X 1957-07-09
CH1183667X 1957-07-09
CH1197597X 1957-07-09

Publications (1)

Publication Number Publication Date
GB843320A true GB843320A (en) 1960-08-04

Family

ID=27178618

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21483/58A Expired GB843320A (en) 1957-07-09 1958-07-04 Process and apparatus for the extrusion of thermoplastic material

Country Status (2)

Country Link
FR (1) FR1197597A (en)
GB (1) GB843320A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190035A (en) * 1986-05-08 1987-11-11 Polysystems Machinery Manufact Film extrustion die-lip heater
EP2917017A1 (en) * 2012-11-09 2015-09-16 Windmöller & Hölscher KG Die device for an extrusion blow-moulding apparatus for producing a multilayered blown film

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123699A (en) * 1964-03-03 Induction heated circular
CA1210918A (en) * 1983-06-28 1986-09-09 Arakalgud V. Ramamurthy Process for substantially eliminating surface melt fracture when extruding ethylene polymers

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190035A (en) * 1986-05-08 1987-11-11 Polysystems Machinery Manufact Film extrustion die-lip heater
US4830595A (en) * 1986-05-08 1989-05-16 Polysystem Machinery Mfg. Inc. Die-lip heater
US4842504A (en) * 1986-05-08 1989-06-27 Polysystem Machinery Mfg. Inc. Lip heater for plastic extrusion die
EP2917017A1 (en) * 2012-11-09 2015-09-16 Windmöller & Hölscher KG Die device for an extrusion blow-moulding apparatus for producing a multilayered blown film
US9713896B2 (en) 2012-11-09 2017-07-25 Windmöller & Hölscher Kg Die device for an extrusion blow-moulding apparatus for producing a multilayered blown film

Also Published As

Publication number Publication date
FR1197597A (en) 1959-12-01

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