SU1694738A1 - Method for manufacturing unwoven pierced by needle material - Google Patents

Abstract

The invention relates to the textile industry, in particular to the production of nonwovens, and makes it possible to improve the quality of the material. The method includes forming a canvas of synthetic fibers, pre-bonding of the canvas with needling and subsequent needling. The surface of the pre-bonded canvas immediately before the final needling is moistened from the entrance of the needles with water or an aqueous emulsion by spraying in an amount of 0.5 to 20% of the surface density of the material. Spraying the humidifier is carried out at an angle of 25 to 75 ° C. to the surface to be treated.

Description

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The invention relates to the textile industry, in particular to the production of nonwoven needle-punched materials.

The aim of the invention is to improve the quality of the material by increasing its strength characteristics.

The goal is achieved by moistening the surface of the pre-bonded canvas immediately before the final needling of the needles with water or an aqueous emulsion by spraying in an amount of 0.5 to 20% of the surface density of the material. In this case, the spraying of the moisturizing composition is carried out at an angle of 25 - 75 ° to the treated surface.

A method of manufacturing a non-woven needle-punched material is carried out as follows.

PRI me R 1. Polyamide staple fiber is combing, forming

Canvas, prior needling at a density of 40 1 / cm needles, then just before the final needling, the surface of the previously bonded canvas from the side of the final needling is moistened with water by spraying it at an angle of 25 to 75 ° to the surface and in an amount of 20% from the surface density (mass of 1 sq. m) material.

EXAMPLE 2. Polyester staple fiber passes carding, formation of a canvas, pre-needling when the needling density is 40 1 / cm, then immediately before the final needling, the surface of the pre-bonded canvas from the end of the needles is moistened water emulsion antistatic OS-20 by re

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spraying as in example 1 in the amount of 0.5% of the surface density (mass 1 square meter) of the material.

EXAMPLE 3 A polyamide staple fiber is formed into a canvas, subjected to its preliminary needling at a puncture density of 40 1 / cm2, then the surface of the bonded canvas from the needle entrance side is moistened with 10% of surface density emulsion of AF-10K (mass of 1 sq. m) material.

The advantage of spraying water or water emulsion over the surface of a pre-bonded canvas at an angle of 25 to 75 ° to it is that tiny particles of water or water emulsion in the form of a mist settle on the fibers and, spreading over their surface, moisten it evenly. This ensures uniform wetting, because during the final needling, each piercing needle comes into contact with a bundle of moistened fibers, which are pulled through the mass of fibrous canvas, fastened it into the needle-piercing structure, and there is no damage or tearing of the fibers at the moment of their capture by the notches of the piercing needles. Due to this, the puncture force of the piercing needles and the load on the working bodies (needle cases, lower and upper piercing tables, as well as on supports and beds) of needle-punching machines are also reduced. Thus, the productivity and service life of the equipment is increased. Improving the quality of the nonwoven material is achieved by preventing fibers from breaking during needling through uniform distribution of the sizing agent over the surface of the fibers and the surface of the piercing needles, which reduces the interaction forces of the fibers forming the nonwoven structure and eliminates breakage of piercing needles and fiber damage.

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The lower limit of the amount of applied water or water emulsion 0.5% of the surface density of the material is due to the minimal wetting effect, which, in combination with the type of emulsifying drug and its concentration in the emulsion composition, provides an improvement in the quality (physical and mechanical properties) of the nonwoven needled material in comparison with the untreated material.

The upper limit of the amount of applied water or water emulsion is 20% of the surface density of the material (mass of 1 sq. M) due to the maximum moisture that is maintained due to the porosity of the nonwoven material, based on the nature of the fibers used, which prevents damage to equipment due to increased humidity (corrosion, damage to electrical equipment), and also eliminates the run-off of water or water emulsion in the production area.

All operations of the method can significantly improve the strength of the material.

Claims (1)

Invention Formula A method of manufacturing a non-woven needle-punching material, in which a synthetic fiber canvas is formed, is subjected to its preliminary bonding, moistening and final strengthening by needle-punching, characterized in that, in order to improve 5 quality of the material by increasing its strength properties, wetting the canvas is carried out immediately before its final hardening by needling with water or 0 water emulsion in the amount of 0.5–20% of the surface density of the material, which is applied by spraying at an angle of 25–75 ° to the surface of the previously bonded canvas, located on the inlet side of the needles.