Importance

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Abstract

When a drawable material is forcibly drawn for obtaining a drawn product formed of a crystalline polymer, there is caused a failure such as draw breaking, and the drawn product formed of a crystalline polymer that can be industrially produced by a conventional drawing method has upper limits of physical property values depending upon the material of said drawn product formed of a crystalline polymer. In the present invention, pressurized saturated steam having an absolute pressure of at least 2.0 kg/cm.sup.2 as a drawing medium is charged into an airtight container having a drawable material inlet for feeding a drawable material thereinto and a drawn product outlet for withdrawing a drawn product formed by drawing the drawable material, to provide a drawing chamber; pressurized water is utilized to prevent the leakage of the pressurized saturated steam through said drawable material inlet and said drawn product outlet, respectively; a drawable material is introduced into the pressurized water which is preventing the leakage of the pressurized saturated steam from said drawable material inlet; said drawable material is introduced through said drawable material inlet to the drawing chamber to draw the drawable material after water adheres to the drawable material surface; and then, a drawn product withdrawn through said drawn product outlet is introduced into the pressurized water which is preventing the leakage of the pressurized saturated steam through said drawn product outlet, to cool the drawn product, so that there can be obtained a drawn product formed of a crystalline polymer having more desirable physical properties.

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First Claim