MANUFACTURE OF CRYSTALLINE POLYMERIC SHEET

Title:

MANUFACTURE OF CRYSTALLINE POLYMERIC SHEET

Document Type and Number:

Japanese Patent JPS6015120

Kind Code:

A

Abstract:

PURPOSE: To obtain the titled sheet that has a smooth surface, and is transparent, and high in strength and elasticity modulus, by passing a crystalline polymeric sheet stock sheet between a pair of rollers that have been heated to a specified temperature, and drawing the sheet at a draw ratio of down to a specified value.

CONSTITUTION: A crystalline polymeric stock sheet is passed between a pair of rollers that have been heated to a temperature down to a transformation start temperature T1, which is measured when a load of 10MPa is applied to the stock sheet and the stock sheet is heated at a rate of 1°C/min, but not exceeding the kick-off temperature T2 of the melting curve of measurements by differential scanning and is drawn at a draw ratio of down to 2.5 and preferably at a drawing speed of not more than 500mm/min to obtain the intended sheet. It is preferable to preheat the stock sheet.

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Inventors:

KAIDOU AKIRA
NAKAYAMA KAZUO
KANETSUNA HISAAKI

Application Number:

JP12392583A

Publication Date:

January 25, 1985

Filing Date:

July 07, 1983

Export Citation:

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Assignee:

KOGYO GIJUTSUIN

International Classes:

B29C55/06; B29K23/00; B29K59/00; B29K77/00; B29L7/00; (IPC1-7): B29C55/06

Domestic Patent References:

JPS59215826A

1984-12-05

Attorney, Agent or Firm:

Director, Institute of Textile and Polymer Materials, AIST

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