GB934773A - Thermoplastic films and method and apparatus for obtaining the same - Google Patents

Thermoplastic films and method and apparatus for obtaining the same

Info

Publication number
GB934773A
GB934773A GB27731/61A GB2773161A GB934773A GB 934773 A GB934773 A GB 934773A GB 27731/61 A GB27731/61 A GB 27731/61A GB 2773161 A GB2773161 A GB 2773161A GB 934773 A GB934773 A GB 934773A
Authority
GB
United Kingdom
Prior art keywords
gauge variation
water bath
film
stream
gauge
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
GB27731/61A
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.)
Millennium Petrochemicals Inc
Original Assignee
National Destillers and Chemical Corp
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 National Destillers and Chemical Corp filed Critical National Destillers and Chemical Corp
Publication of GB934773A publication Critical patent/GB934773A/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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the material
    • 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
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

In a method for producing sheet film of thermo plastic material the cumulative effect of straight line gauge variation, due usually to small defects in the extrusion die lips, on the appearance of a roll of the film is overcome by introducing a controlled gauge variation over the film in such a manner as to avoid the magnification <PICT:0934773/IV(a)/1> effect. In the apparatus illustrated molten film 5 is discharged downwardly from die lips 3, 4 between hollow chill roll 11, cooled by refrigerated liquid entering hollow shaft 11a and leaving hollow shaft 11b, and water roll 12 in trough 21 provided with weir 22 and overflow cup 23 having discharge connection 24. Nozzle 34 directs a stream of water downwardly against sheet 5 at a pressure of from 1/2 to 10 p.s.i. To produce a gauge variation greater than the average gauge the stream is at least 3 DEG C. below the water bath temperature and is directed 1/4 inch above the water bath level. For a smaller gauge variation the stream is at least 3 DEG C. above the water bath temperature and is directed 1/4 inch below the water bath level. Nozzle 34 is reciprocated by motor 39 driving block 33 reversibly on rods 37, 38 thus generating a sine-wave gauge variation which masks any straight-line gauge variation. Specification 914,100 is referred to.
GB27731/61A 1960-08-04 1961-07-31 Thermoplastic films and method and apparatus for obtaining the same Expired GB934773A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4751560A 1960-08-04 1960-08-04

Publications (1)

Publication Number Publication Date
GB934773A true GB934773A (en) 1963-08-21

Family

ID=21949409

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27731/61A Expired GB934773A (en) 1960-08-04 1961-07-31 Thermoplastic films and method and apparatus for obtaining the same

Country Status (1)

Country Link
GB (1) GB934773A (en)

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