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Method and apparatus for longitudinal orientation of thermoplastic film material

A longitudinally oriented, thermoplastic polymer technology, applied in the field of longitudinally oriented thermoplastic film materials, capable of solving problems such as film folding or wrinkling

Active Publication Date: 2010-11-10
THE SUPREME IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, forcing the film to form folds or wrinkles

Method used

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  • Method and apparatus for longitudinal orientation of thermoplastic film material
  • Method and apparatus for longitudinal orientation of thermoplastic film material
  • Method and apparatus for longitudinal orientation of thermoplastic film material

Examples

Experimental program
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Effect test

Embodiment

[0086] Extruded 100 micron thick tubular film from the following ingredients:

[0087] The middle layer, a total of 70%: 100% HMWHDPE;

[0088] Inner surface layer, total 10%: LLDPE with m.f.i.=1.

[0089] Outer surface layer, total 20%: 60% metallocene PE + 40% LLDPE; m.f.i.=1.

[0090] The width of the flattened film: 54 cm. At 15°C, the Figure 2a The flattened film is pleated and stretched in the device of and b, and modified as follows:

[0091] The radius of the banana-shaped roller 15 is 1.00 m and the radius of the banana-shaped roller 14 is 1.50 m, which still gives a degree of pleating of 1.5:1. Stretching takes place in only two steps. The grooved roller pair 16 is omitted. The roller pair 18 has a radius of 1.06 meters, and the roller pair 17 has a radius of 1.15 meters. The pitch of the driven, grooved roller 7 is 15 mm, and accordingly it is similar to Figure 4a Related calculations to calculate the pitch of other grooved rolls.

[0092] The temperature of the stretch...

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Abstract

Method and apparatus for longitudinal orientation of thermoplastic film material (4) comprises a width-reduction zone upstream of the longitudinal stretching zone, through which the width of the film is gradually reduced so as to allow longitudinal stretching without necking. The width-reduction zone comprises at least one, preferably several, pairs of pleating rollers (16, 17) comprising intermeshing grooves or discs for pleating the material, the length of said width reduction zone preferably being less than 3 times the original width of the film. The width-reducing zone has upstream (14) and downstream (15) rollers or roller assemblies, with curved axes and optionally also conveyor belts for providing smooth width reduction. Longitudinal stretching is preferably between at least two, and preferably more than two, pairs of stretching rollers (9, 10, 11, 12) which are relatively close together. The pleats may be provided in several stages with increasing pleats per stage, while guiding means preferably lay all the pleats to one side. The method allows achievement of high tensile strength, yield point, resistance to tear propagation and puncture resistance, especially for polyethylene and polypropylene films.

Description

Technical field [0001] The present invention relates to a method and device for longitudinal orientation of thermoplastic film materials, and in particular to the manufacture of cross laminates of films that have been uniaxially stretched at relatively low temperatures. Background technique [0002] It is known that the best omni-directional strength properties are obtained in a staggered laminate through the following orientation steps: first, a strong, almost uniaxial melt orientation is performed during extraction from the extrusion die, or, better yet, when the polymer material The orientation is almost uniaxial during semi-melting, and then further orientation at a relatively low temperature. "All-round strength properties" here refer to the combination of tensile strength, yield point, tear propagation resistance and puncture resistance. It is difficult to give a satisfactory explanation why this combination of orientation steps is better, but it can be simply said that wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/18B29C55/06
CPCB29C55/18B29C55/065
Inventor 奥利-本特·拉斯马森N·W·拉斯马森
Owner THE SUPREME IND
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