KR960022704A - Biaxially oriented polyamide film and its manufacturing method - Google Patents

Abstract

The present invention relates to a sequential biaxially stretched polyamide film and a method for producing the same, and in particular, prepared by sequential biaxial stretching with an aliphatic polyamide as a main component, the α-crystal content index is 0.7 to 1.5, The present invention relates to a polyamide film having a suitable use as a food packaging material having excellent mechanical properties and gas barrier properties having a crystal content index of 0.3 to 0.8, and a method of manufacturing the same.

In order to achieve the above object, the present invention in the manufacturing by sequential biaxial stretching with an aliphatic polyamide as a main component, the α crystal content index of the stretched film in the longitudinal direction is 0.1 to 0.2, After the crystal content index was 0.29 to 0.5, the film was stretched in the transverse direction so that the α crystal content index of the stretched film was 0.7 to 1.5, It provides a process for producing a polyamide biaxially oriented film, characterized in that the crystal content index is 0.3 to 0.8.

Description

Biaxially oriented polyamide film and its manufacturing method

As this is a public information case, the full text was not included.

Claims (7)

In the production by sequential biaxial stretching with an aliphatic polyamide as a main component, the α crystal content index of the stretched film in the longitudinal direction is 0.1 to 0.2, After the crystal content index was set to 0.29 to 0.5, the film was stretched in the transverse direction and the α crystal content index of the stretched film was 0.7 to 1.5, It provides a method for producing a polyamide biaxially oriented film, characterized in that the crystal content index is 0.3 to 0.8. The method according to claim 1, wherein the α content index and Crystal content index is related to the thickness of the 1120㎝ ^-1, 975㎝ ^{-1, -1} the peak 929㎝ each polyamide film that appears when analyzing the polyamide film by FT-IR peak, A peak related to a crystal content, and a peak related to a crystal content, and is defined by the following relationship from the area of each pipe. α crystal content index = 929 cm ⁻¹ area of peak / 1120 cm ⁻¹ area of peak, Crystal content index = 929 cm ⁻¹ area of peak / 1120 cm ⁻¹ area of peak. The method according to claim 1, wherein the longitudinal stretching is performed by stretching the film compressed with the molten polyamide resin by 3.0 to 3.5 times at a temperature of 50 to 70 캜. The method according to claim 1, wherein the transverse stretching is performed by stretching 3.5 to 3.9 times at 65 to 80 占 폚. The method of claim 1, characterized in that the heat treatment at a relaxation rate of 2 to 5% at a temperature of 200 to 240 ℃ after transverse stretching. The α crystal content index of the film produced by any one of claims 1 to 6 is 0.7 to 1.5, A biaxially stretched polyamide film having a crystal content index of 0.3 to 0.8. The method according to claim 6, wherein the α crystal content index and Crystal content index associated 1120㎝ ^-1, a peak of 975㎝ ^{-1, -1} 929㎝ appear when analyzed by FT-IR of a polyamide film and the thickness of each polyamide film peak, 2. A biaxially oriented polyamide film process according to claim 1, wherein the peak is related to the crystal content and the peak related to the α content is defined by the following relationship from the area of each pipe. α crystal content index area = 929cm ^-1 / 1120cm ^-1 peak area of the peak, γ crystal content index = 929cm ^-1 peak area / area of 1120cm ^-1 peak of. ※ Note: The disclosure is based on the initial application.