RU2077625C1 - Nonwoven material-making method - Google Patents

Abstract

FIELD: textile manufacturing. SUBSTANCE: fibrous linen is formed by modified polyamide fibre tied by warp-knitting weave with loops made from fibre of linen, and thermoplastic fibre layer is added to linen. So made linen is duplicated by skeleton made from warp and shoot wires worked out by modified polyamide superthin fibre using. Thermoplastic fibre is used as sewing thread and mass relation of warp, shoot and sewing yarn is chosen by proportion (1 - 2):(1.5 -2):1 using but mass relation of anion-exchanging, thermoplastic fibre and skeleton forming materials is (2 - 3):(1 - 1,5):1. After fibrous linen and skeleton bonding whole tissue is thermally treated at temperature 90 deg C. EFFECT: enhanced quality of nonwoven material. 1 tb

Description

 The invention relates to the textile industry, to the field of manufacture of filtering nonwoven materials, and can be used for the manufacture of filter elements for respirators and respiratory installations for cleaning gas-air mixtures (DHW) from toxic acid gases and solid particles.

The closest solution to the proposed one is a method of manufacturing a nonwoven material, including the formation of a fibrous canvas from a layer of anion-exchange modified polyamide fiber and fastening it with a warp knit, the loops of which are made of fibers of the canvas itself [1]
The disadvantage of this method is not sufficiently high protective properties of the manufactured material.

 The task of the invention is to increase the protective and operational properties of the manufactured material.

The problem is solved in that in the method of manufacturing a nonwoven material, including the formation of a fibrous canvas from an anion-exchange modified polyamide fiber and fastening it with a warp knit, the loops of which are made of fibers of the canvas itself, when forming into the fibrous canvas, a layer of thermoplastic fiber is additionally introduced, the formed fibrous canvas is duplicated with a frame consisting of warp and weft threads fastened with piercing threads, and using warp and weft threads yarn is made from a hydrophilic modified polyamide fiber, a thermoplastic thread is used as the piercing thread, while the ratio of the content of warp, weft and piercing thread by mass is (1 2) :( 1,5 2): 1, the ratio of the layers is from anion-exchange, thermoplastic fibers and the frame by weight is (2 3) :( 1 -1.5): 1, and after bonding the fibrous canvas and the frame, the resulting material is subjected to heat treatment at an optimum temperature of 90 ^o C.

 The method is as follows.

The material is obtained by combined technology. KM-A1 fiber and chlorin are combed through carding machines, a two-layer canvas is formed, fastened on a knitting and stitching machine using a threadless technology, and the lower layer when bonded consists of chlorin fiber. The fabric is duplicated with the frame, the frame is placed on the side of the anion-exchange layer, the material is subjected to thermal pressing on calendars at a temperature of 90 ± 5 ^° C, the pressure between the fibers is 15 dan / cm ² for 60 s. After thermal pressing, in which the layer of thermoplastic fibers melts, decreases in volume, weakened loops appear on its outer surface, forming a relief surface. Solid particles settle on this relief “loop” surface, thereby helping to prevent the anion-exchange layer from clogging with solid particles, which increases the protective properties of the material. By standard methods, the properties of the claimed material and the prototype material are determined under comparable conditions: HCl concentration of 2.5 mg / m ³ , HF 150 mg / m ³ , SO ₂ 2.5 mg / m ³ ; DHW humidity: HCl 82% HF 82% SO ₂ 90% (GOST 15902.1-80, 15902.3-79, 120088-77, 10125-75). The indicators are given in the table.

 Examples of specific performance.

 Example 1

KM-A1 fiber, chlorin are combed through carding machines, a two-layer canvas is formed, fastened on a knitting and stitching machine using a threadless technology, duplicated with a frame, the ratio of the layers by weight is 2: 1: 1. The ratio of the content of the carcass filaments is 1.5: 1.75: 1 (base: weft: piercing). The material is subjected to heat pressing at a temperature of 85 ^o C. According to standard methods determine the properties of the material. The indicators are given in the table.

 Example 2

KM-A1 fiber, chlorin are combed on carding machines, a two-layer canvas is formed, fastened on a knitting and piercing machine using a threadless technology, duplicated with a frame. The ratio of the layers by weight is 2.5: 1.25: 1. The ratio of the content of warp, weft and piercing frame is 1.5: 1.75: 1. The material is subjected to heat pressing at a temperature of 90 ^o C. According to standard methods determine the properties of the material. The indicators are given in the table.

 Example 3

KM-A1 fiber, chlorin are combed on carding machines, a two-layer canvas is formed, fastened on a knitting and piercing machine using a stringless technology, duplicating it with a frame. The ratio of the layers of anion exchange, thermoplastic and frame by weight 3: 1.5: 1. The ratio of the content of warp, weft and piercing by weight is 1.5: 1.75: 1. The material is subjected to heat pressing at a temperature of 95 ^o C. According to standard methods determine the properties of the material. The indicators are given in the table.

 Example 4

KM-A1 fiber, chlorin are combed on carding machines, a two-layer canvas is formed, fastened on a knitting and piercing machine using a threadless technology, duplicated with a frame. The ratio of the layers of anion exchange, thermoplastic and frame by weight 2.5: 1.25: 1. The ratio of the content of warp, weft and piercing by weight is 1: 1.5: 1. The material is subjected to heat pressing at a temperature of 85 ^o C. According to standard methods determine the properties of the material. The indicators are given in the table.

 Example 5

KM-A1 fiber, chlorin are combed on carding machines, a two-layer canvas is formed, fastened on a knitting and piercing machine using a threadless technology, duplicated with a frame. The ratio of the layers of anion exchange, thermoplastic and frame by weight 2.5: 1.25: 1. The ratio of the content of warp, weft, piercing by weight 2: 2: 1. The material is subjected to thermal pressing at a temperature of 90 ^o C. According to standard methods determine the properties of the material. The indicators are given in the table.

 Nonwoven fabric can be used in respirators and respiratory installations. A new technical property causes a positive effect: an increase in the reliability and comfort of protection.

Claims (1)

 1 A method of manufacturing a nonwoven material, comprising forming a fibrous canvas from a layer of anion-exchange modified polyamide fiber and fastening it with a warp knit, the loops of which are made of fibers of the canvas itself, characterized in that when forming into the fibrous canvas, a thermoplastic fiber layer is additionally introduced, the formed fibrous canvas is duplicated with a frame consisting of warp and weft stitched together with piercing threads, moreover, yarn of g idrophilic modified polyamide fiber, a thermoplastic thread is used as a piercing thread, while the ratio of the content of warp, weft and piercing threads by weight is 1 2 1.5 2 1, the ratio of layers of anion-exchange, thermoplastic fibers and frame by weight is 2 3 1 1 , 5 1, and after bonding the fibrous canvas and the frame, the resulting material is subjected to heat treatment at 90 <198> C.

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