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Laminate of thermoplastic film materials exhibiting throughgoing porosity

A thermoplastic film and composite technology, applied in lamination auxiliary operations, lamination, layered products, etc., can solve the problem of high manufacturing costs

Inactive Publication Date: 2011-03-02
奥利本特拉斯马森
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These products are quite expensive to manufacture

Method used

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  • Laminate of thermoplastic film materials exhibiting throughgoing porosity
  • Laminate of thermoplastic film materials exhibiting throughgoing porosity
  • Laminate of thermoplastic film materials exhibiting throughgoing porosity

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0108] The purpose of this example is to manufacture and test samples of household plastic wrap, in principle by means of image 3 The process shown in the two flow charts in and by means of the equivalent of Figure 4 with Figure 5 The device - certainly more suitable for laboratory conditions.

[0109] The first step is the manufacture of a coextruded tubular membrane from HDPE with m.f.i. = 0.1, covering about 15% of its inner sides with a face sheet consisting of LLDPE with m.f.i. = 1.0, with a polymer blend Covering about 10% of its exterior sides, the blend is suitable at moderate temperatures to create a bond that is not so strong that resistance to tear propagation becomes insignificant, and not so weak that delamination is a problem. A suitable temperature means that the lamination temperature must be so low that shrinkage of the oriented, thermally stabilized film can be avoided by using simple edge maintaining means. For this purpose, a blend of 85% of the above...

example 2

[0116] The purpose of this example is to manufacture and test samples of household plastic wrap made of image 3 produced in a variation of the process in which one layer (a) is longitudinally embossed by stretching in sections between grooved rollers and the other layer (B) is given a transverse orientation without providing any embossment . Layer A is the film produced according to Example 1 above by coextrusion, stretching between grooved rollers, longitudinal stretching, thermal stabilization and opening of both sides of the flat tube. However, the tubular membrane is cut longitudinally instead of helically.

[0117] Layer B was coextruded under the same conditions as Layer A, but as described above, no relief was provided. In order to simplify this laboratory test, it was not subjected to tenter-frame stretching or similar steps, but was first subjected to longitudinal orientation and heat stabilization, as explained below, and then cut into many short length strips. T...

example 3

[0121] The purpose of this example is to manufacture and test figure 1 Composite shown.

[0122] In the first step, a coextruded tubular membrane is produced from HDPE with m.f.i. = 0.1, covered on about 20% of one side with a surface sheet consisting of a metallocene LLDPE with a melting point of 100°C. The blow ratio was limited to about 1.2:1, the gap of the exit holes was 1.5 mm, and the final membrane thickness was 40 μm. A relatively high melt orientation is thus introduced. The tubular membrane in flat form was stretched longitudinally at 40°C in a ratio of 4:1 and stabilized as explained in Example 1. The stretching process takes place between closely spaced rollers. Before the first stretching process, the film had fine longitudinal corrugations - similar to those described in Example 2, but now the edge-to-edge distance was reduced due to the flat form of the film.

[0123] Oriented flattened tubular membrane - now with gauge 25 µm, helically cut at a 45° angle....

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Abstract

A laminate of thermoplastic film materials exhibiting throughgoing porosity and comprising plies A and B, A having an inner surface A1 partly in contact with B and an outer surface A2, and B having an inner surface B1 partly in contact with A and an outer surface B2, A and B consisting of continuous material except for a multitude of perforations in each ply, whereby essentially no perforation inA corresponds directly to a perforation in B, the lamination between A and B on surfaces A1 and B1 being a) through a coextruded lower melting lamination layer on A and / or B and b) established in such discontinuous manner that there is formed a channel system between A1 and B1 connecting the majority of the perforations in A each with at least one of the perforations in B, and connecting the majority of the perforations in B each with at least one of the perforations in A is provided in addition to a process and apparatus for producing such a laminate.

Description

technical field [0001] The present invention relates to laminates of thermoplastic membrane materials exhibiting through-porosity, more specifically, porosity - at least in the portion where fluid passes from one surface to the other - characterized by microporosity. Microporous membrane or sheet materials - including laminates - have found widespread use, especially as "household wrap", roof underlayments and decking - which keep rain out while allowing moisture to escape. Background technique [0002] For such applications, water static and dynamic resistance to water pressure - combined with air and water vapor permeability, as well as bending tension, puncture strength and tear propagation resistance - are of particular importance. If used on the sub-roof, it is generally believed that the hydrostatic hydraulic resistance must be at least 60 cm water column, preferably 100-200 cm water column, and the simpler "household plastic wrap" has lower requirements. Materials cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B38/04B29C55/18B32B38/18
Inventor 奥利-本特・拉斯马森
Owner 奥利本特拉斯马森
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