JPS648112B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a non-woven or woven fabric or a knitted fabric with good heat retention, consisting of a discontinuous coating coated on one side and consisting of a binder and fine metal particles contained therein. The present invention relates to a flat fiber product for core fabric.

A method for improving the two-stage insulation capacity of textiles without significantly interfering with porosity, hand and flexibility by applying a layer of binder and microscopic metal strips on one side is described in German Patent Application No. 1108174. It is known as No. The metal strips in the binder are also distributed on its surface, but are preferably bonded only to the protruding fibers. The coated fabric is suitable as interlining for clothing.

Therefore, attempts have already been made to utilize this method in order to improve the heat insulation properties of nonwoven fabrics that are also used. However, in that case an undesirable curing effect and a significant inhibition of air permeability occurred.

The heat retention properties of flat fiber products generally increase as the thickness increases. Parallel to the increase in thickness, the resistance to the passage of moisture also increases, with the result that textiles that are warm in themselves can lead to unpleasant sweaty skin after short periods of wear. The thickness of the flat fiber product is therefore selected in such a way as to ensure sufficient heat retention at a given nominal temperature as well as sufficient drainage of the moisture generated. The compromise thus taken poses difficulties when the ambient temperature deviates significantly from the above-mentioned nominal temperature. In this sense, it is assumed that a feeling of comfort is generally provided only if the average skin temperature does not exceed 32°C. In that case, individual deviations of ±4° C. may appear within a specific area. Also, if you want to give a feeling of comfort, the sweat coating on the skin surface should be 30%
Must be less than %.

The aim of the present invention is to develop a method by which the insulation properties of core fabrics of any construction can be improved without significantly compromising the properties or breathability of the textile.

This purpose is achieved in that the coating according to the invention consists of a number of partial layers separated from each other, the partial layers having an average diameter of
This is achieved by covering 5 to 40% of the total area with 0.5 to 2 mm.

By separating the individual sublayers from one another, it is avoided that the breathability or hand of the coated flat product is impaired. This applies equally to woven, knitted or non-woven coatings, regardless of whether they are flat products made of multifilament yarns or of monofilaments. Monofilament fabrics, such as spun or staple webs for the applications in question, have a very fine fiber structure and a negligible uniform thickness. Therefore, when coated with a binder suspension, at least a portion of this suspension penetrates into the fiber interstices and, after crosslinking, the formation of bridges between adjacent fibers and the suspended solids is avoided. do not have. This process results in undesirable hardening effects. This is particularly the case when the solid material is in the form of scales or thin plates and covers a plurality of fibers or gaps between fibers. The proposed fabric avoids this type of drawback.

The core fabric usually contains hydrophilic fibers, such as cotton or cotton. Although this results in a reduction in water transport resistance (which is highly desirable), this application may result in an improper distribution of the hydrophobic binder used, e.g. in the form of an intermittent or continuous thin film. Therefore, the above may be hindered. According to the invention, however, the binder is applied in mutually separated partial layers, with 60 to 95% of the surface being applied.
% remains uncoated. The partial layer has a complete elongated or circular shape and a maximum diameter of 0.5 to 1.8 mm. Each partial layer covers only a small portion of the individual fibers of the flat product, preferably 12 to 60 mm in length. The above circumstances are thought to be the reason why the proposed flat fiber product has a moisture permeation resistance that is not significantly different from that of the same type of flat fiber product that is not coated.

Preferably, the partial layer covers 10 to 20% of the total area of the flat product. By arranging the individual partial layers relative to each other in a specific manner, further advantages with respect to the mutual arrangement can be obtained. For example, the partial layers can be arranged in a regular pattern with completely uniform spacing. In this case, a directional hardening effect is observed, which manifests itself in good fold alignment parallel to the rows of the individual partial layers of the flat product.

The sublayers can be distributed irregularly, for example with mutual spacings distributed around a mean value according to a statistical normal distribution. However, in that case, according to the rules of the statistical normal distribution, in some areas the mutual spacing of two adjacent sublayers is much larger than the average spacing, while in other areas the individual sublayers are in direct contact. Inevitable. However, the resulting disadvantages are easily avoided by arranging the sublayers in a pattern in which the mutual spacings are distributed quite uniformly around the mean value according to a rectangular distribution. However, in this case,
The application must be done precisely, preferably using a printing device. Other distributions can also be produced using a printing device, but the structure of the paper pattern used is then quite simple.
The statistical distribution of the partial layers can also be obtained using the scattering or spraying method.

If the partial layer application is carried out in liquid form, it is preferable to observe the following rules:

The binder dispersion used preferably has a solids content of up to 50% by weight and contains 10 to 50% by weight, based on the solids content, of metal powder with a particle size of 3 to 90 μm. The application must be done in a neat pattern. That is, the viscosity must be precisely adjusted depending on the coating technique selected. In this sense, the type of metal powder used must also be considered. Preference is given to using aluminum or aluminum alloy powder. Heavy metal powders, such as brass or copper powders, can also be used. In this case, however, the viscosity of the binder dispersion used must be adjusted to a slightly higher value in order to avoid precipitation occurring during or after application. However, for those skilled in the art who have gained experience in this field, specific adjustment of individual parameters is not at all difficult. In any case, it must be kept in mind that it is important that the printed pattern created be accurately and clearly constructed. Blurring or smearing of the binder component in certain areas must be completely avoided.

In principle, all known dispersing or emulsifying binders can be used, such as acrylic ester polymers, butadiene-acrylonitrile polymers, butadiene-acrylonitrile polymers,
Styrol polymers, polysiloxanes, formaldehyde condensates or mixtures thereof and others are suitable. In order to create a porous structure in the partial layer formed, it has proven advantageous to preferably use binders that can solidify at low temperatures. The above effects can be achieved by the addition of thermosensitizers or by the use of binders that polymerize under the action of light. In that case, crosslinking is preferably carried out immediately after application to the flat fiber product, and the liquid phase is then removed in a conventional manner, for example by suctioning and/or hot air drying.

The flat fiber products according to the present proposal are suitable as interlinings and linings for garment tailoring. It is likewise possible to finish the garment outer material according to the present proposal by providing a partial layer covering on the inside.

For special configurations, specific rules must be taken into account.

That is, if the individual sublayers are arranged irregularly and statistically disorderly relative to one another, this results in direction-independent flexibility of the flat product. This is often desirable for linings and outer fabrics. When the partial layers are arranged in a pattern that regularly repeats one another, a greater degree of folding occurs parallel to the direction of the individual partial layers than in the direction transverse to this direction. Such behavior is required for core fabrics and is preferably applied to this side.

The proposed flat product can be sewn or pasted onto other flat products, and in the above case a method similar to the pasting of fixed cores can be applied.

The metal powder binder used can be optionally colored. This is important in producing flat fiber products with an appearance that meets the demands of fashion. This is the case, for example, with linings.

A particular advantage of the proposed flat fiber product is that the transfer of heat generated within the flat surface of the flat fiber product is largely suppressed. The skin of the human body, of course, exhibits different high temperature levels in different areas. The amount of heat radiated in each case is reflected by the proposed flat product according to its temperature level, so that each temperature level itself is maintained, which makes it feel particularly comfortable. In practice, this feature is of great importance.

Example: Heterofil fiber consisting of polyamide 66 core and polyamide 6 skin (dtex3.3/40, semi-gloss)
15 parts polyamide 66 fiber (dtex3.3/60, matte)
35 Same as above (dtex3.3/51, matte) 30 Polyester fiber (dtex3.3/60, matte)
A soft, irregularly arranged web of 20 parts by weight, weighing approximately 40 g/ ^m2, is heat-set by known methods, then part by weight of aluminum powder (average particle size 25 microns)
100 Polyacrylate dispersion 150 Polybutadiene dispersion 150 Melamine resin 60 Polyvinyl alcohol 30 Diethylene glycol 50 Diammonium phosphate 1.5 Antifoam dispersion 30 Water 630.7 1194.2 Printing paste with 30% solids content, 25 meshes, opening Printing was performed using a 0.5 mm screen to a thickness of 0.22 mm and a coating amount of 40 g/m ² and dried.

The nonwoven fabric treated in the above manner was sewn under the outer material of the right chest part of the wind jacket. A nonwoven fabric treated with the same binder dispersion without metal powder was sewn in the same manner into the left chest area of the same wind jacket. A wind jacket was placed on the subject, and the subject remained quietly in a room at a temperature of 20°C. After 10 minutes, the thermal camera “Thermographic Imager, 800
I created a photo of the chest using the ``type''. This photograph demonstrates that the average surface temperature of the chest on the side with the interlining fabric according to the invention is 1.5 to 2° C. higher than the average surface temperature on the opposite side. In this way, a much improved thermal insulation effect occurs with the same moisture permeation resistance.

In order to eliminate the influence of the subject on the measurement results, the test was subsequently repeated using the opposite style of wind jacket. The obtained infrared photographs confirmed the above results.

Claims (1)

[Claims] 1. A flat material with good heat retention, consisting of a nonwoven fabric, woven fabric, or knitted fabric, and a discontinuous coating coated on one side of the fabric and consisting of a binder and fine metal particles contained therein. A textile product in which the coating consists of a number of mutually separated partial layers, each of which has an average diameter of 0.5 to 2 mm and covers 5 to 50% of the total area.
Flat fiber product for core fabric characterized by 40% coverage. 2. The flat fiber product according to claim 1, wherein the partial layer covers 10 to 20% of the total area. 3. The flat fiber product according to claim 1 or 2, wherein the partial layers are arranged at equal intervals in a regular pattern. 4. The partial layer according to claim 1 or 2, characterized in that the partial layers are arranged in a pattern such that mutual intervals are distributed around an average value according to a statistical normal distribution. flat fiber products. 5. The flat structure according to claim 1 or 2, characterized in that the partial layers are arranged in a pattern in which the mutual spacings are distributed around a central value according to a rectangular distribution. Fiber products. 6. A flat fiber product with good heat retention, consisting of a nonwoven fabric, woven fabric, or knitted fabric, and a discontinuous coating coated on one side of the fabric and consisting of a binder and fine metal particles contained therein, The coating consists of a number of sublayers separated from each other, which sublayers have an average diameter of 0.5 to 2 mm and cover 5 to 50% of the total area.
40% coating, the binder dispersion used has a solids content of up to 50% by weight and an average particle size of 3 to 50% by weight.
90μ metal powder, 10 to 50% based on solids content
% by weight. 7. Process according to claim 6, characterized in that the binder of the binder dispersion is crosslinked immediately after application and the liquid phase is then removed by suctioning and/or drying.