Method and apparatus for longitudinal orientation of thermoplastic film material
A longitudinally oriented, thermoplastic polymer technology used in the field of longitudinal orientation of thermoplastic film materials to solve problems such as film folding or wrinkling
Active Publication Date: 2013-09-04
THE SUPREME IND LTD
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Problems solved by technology
Thus, forcing the film to form folds or wrinkles
Method used
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[0086] A 100 micron thick tubular film was extruded from the following ingredients:
[0087] Middle layer, 70% in total: 100% HMWHDPE;
[0088] Inner surface layer, 10% in total: LLDPE with m.f.i.=1.
[0089] Outer surface layer, 20% in total: 60% metallocene PE + 40% LLDPE; m.f.i.=1.
[0090] Width of flattened film: 54 cm. at 15°C, at the Figure 2a The flattened film is pleated and stretched in the apparatus of b and b, and modified as follows:
[0091] A banana roll 15 with a radius of 1.00 meters and a banana roll 14 with a radius of 1.50 meters still gives a degree of pleating of 1.5:1. Stretching is performed in only two steps. The grooved roller pair 16 is omitted. Roller pair 18 has a radius of 1.06 meters and roller pair 17 has a radius of 1.15 meters. The driven, grooved rollers 7 have a pitch of 15 mm and are accordingly similar to Figure 4a Related calculations are used to calculate pitches for 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 apparatus for longitudinal orientation of thermoplastic film materials, and in particular to the manufacture of crosslaminates of films which have been uniaxially stretched at relatively low temperatures. Background technique [0002] It is known that the best all-around strength properties are obtained in crosslamination by the following orientation steps: first, a strong, almost uniaxial melt orientation during extraction from the extrusion die, or better yet, when the polymeric material Almost uniaxial orientation occurs while semi-molten, followed by further orientation at relatively low temperatures. "All-around strength properties" herein refers 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 preferable, but it can be said simply that when orientat...
Claims
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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 LTD