JPS5593421A - Method and apparatus for manufacturing thermoplastic resin film - Google Patents

Method and apparatus for manufacturing thermoplastic resin film

Info

Publication number
JPS5593421A
JPS5593421A JP2379A JP2379A JPS5593421A JP S5593421 A JPS5593421 A JP S5593421A JP 2379 A JP2379 A JP 2379A JP 2379 A JP2379 A JP 2379A JP S5593421 A JPS5593421 A JP S5593421A
Authority
JP
Japan
Prior art keywords
film
thermoplastic resin
cooling drum
constant speed
extruded
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.)
Granted
Application number
JP2379A
Other languages
Japanese (ja)
Other versions
JPS613259B2 (en
Inventor
Takashi Ikeda
Yoshiaki Tanihara
Itsuo Ogiuchi
Hiroshi Noda
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.)
Teijin Ltd
Original Assignee
Teijin 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 Teijin Ltd filed Critical Teijin Ltd
Priority to JP2379A priority Critical patent/JPS5593421A/en
Priority to US06/107,280 priority patent/US4294791A/en
Priority to GB8000286A priority patent/GB2040791B/en
Priority to DE19803000192 priority patent/DE3000192A1/en
Publication of JPS5593421A publication Critical patent/JPS5593421A/en
Publication of JPS613259B2 publication Critical patent/JPS613259B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

PURPOSE: To obtain a film which is used as the magnetic tape base and the like and has a uniform thickness by a method wherein thermoplastic resin is extruded in the form of a film from a die slit, cooled and set on a rotary cooling drum controlled at a constant speed and film tension is kept constant when it is taken up from the drum.
CONSTITUTION: Thermoplastic resin such as polyethylene, polypropylene, etc. is heated, fused and extruded in the form of a film from a die slit, cooled and set on a rotary cooling drum controlled at a constant speed in which the instantaneous rotation fluctuation ratio given by the no load formula is within the accuracy of ±1%. In addition, in order to keep constant the tension of the film taken up from the cooling drum, the film is extended through two or more rolls and at least one dancer roll. Accordingly, the film with uniform thickness is obtained by the effect of film thickness fluctuation control added to that of constant speed control of the cooling drum.
COPYRIGHT: (C)1980,JPO&Japio
JP2379A 1979-01-05 1979-01-05 Method and apparatus for manufacturing thermoplastic resin film Granted JPS5593421A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2379A JPS5593421A (en) 1979-01-05 1979-01-05 Method and apparatus for manufacturing thermoplastic resin film
US06/107,280 US4294791A (en) 1979-01-05 1979-12-26 Process for producing thermoplastic resin film of markedly reduced thickness unevenness
GB8000286A GB2040791B (en) 1979-01-05 1980-01-04 Process for producing thermoplastic resin film of markedly reduced thickness unevenness
DE19803000192 DE3000192A1 (en) 1979-01-05 1980-01-04 METHOD FOR PRODUCING A FILM FROM A THERMOPLASTIC RESIN WITH A SUBSTANTIALLY REDUCED THICKNESS UNIFORMITY

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2379A JPS5593421A (en) 1979-01-05 1979-01-05 Method and apparatus for manufacturing thermoplastic resin film

Publications (2)

Publication Number Publication Date
JPS5593421A true JPS5593421A (en) 1980-07-15
JPS613259B2 JPS613259B2 (en) 1986-01-31

Family

ID=11462793

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2379A Granted JPS5593421A (en) 1979-01-05 1979-01-05 Method and apparatus for manufacturing thermoplastic resin film

Country Status (1)

Country Link
JP (1) JPS5593421A (en)

Also Published As

Publication number Publication date
JPS613259B2 (en) 1986-01-31

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