RU2228692C1 - Method for producing of thermal adhesive coated layer material - Google Patents

Abstract

FIELD: production of layer materials for sewing industry to fuse clothing parts, may be used in chemical and textile industry. SUBSTANCE: method involves producing thermal adhesive coated layer material directly from polymer without use of textile base; applying even layer of powdered polymer onto anti-adherent substrate; fusing and calendaring at temperature exceeding acrylic polymer melting temperature by 40-50 C and under pressure of 15-40 MPa; cooling; winding separately from base into roll. EFFECT: provision for producing layer materials of different surface density, increased adhesion to textile materials and required rigidity. 1 dwg, 1 tbl, 1 ex

Description

The present invention relates to methods for producing hot-melt adhesive cushioning materials for the clothing industry, designed to duplicate clothing parts, in order to give them shape stability and improve the quality of clothing.

A known method of producing hot-melt adhesive nonwoven cushioning materials for the clothing industry, including a melting device, a spinning unit with dies, a blowing device, an air heater and a receiving device. The melt of the polymer in a viscous-flowing state is forced through the openings of the die, captured by a stream of air and laid in a grid or randomly on the receiving device, where it is cooled and twisted into a roll (AS No. 342978 Russia. Publish. 22.06.72. Bull. No. 20 Forost V.I., Mikhailov V.N., Sindeev L.A., Kvasha V.B., Zhulev O.N., Filbert D.V. Installation for producing non-woven material from polymer melt). The materials obtained in this way are designed to fix individual sections of clothing that do not carry heavy loads, and are aimed at reducing production costs and improving the quality of clothing.

A known method of producing a hot-melt adhesive cushioning material containing a substrate - a textile base (fabric, non-woven or knitted fabric), on the front side of which the first thermoplastic polymer layer is applied by screen printing. The second layer, with a melting point higher than the first layer, is applied to the back of the substrate using a transfer roller onto which the polymer is applied by a second screen printing device. The resulting two-sided polymer coating is fixed on the basis of heat treatment (patent No. 2172758 C2. Russia, No. 97104182/04, application. 21.03.1997; publ. 04/27/1999. Lanier de Piccardi. Method for producing hot-melt adhesive material). (Prototype). This cushioning material is used as a gasket in the production of composite textile materials, as well as with the simultaneous duplication of two layers of materials in the production of clothing. The disadvantage of this method is the unjustified expenditure as a substrate of a textile base, usually cotton or linen.

The objective of the invention is to develop a method that allows you to get hot-melt adhesive cushioning material directly from the polymer without the use of a textile base having high adhesion to textile materials and the necessary rigidity.

To achieve this technical result, in the method for producing a hot-melt adhesive cushioning material, comprising applying a thermoplastic polymer in the form of a powder on a substrate, a release material (for example, a polyethylene terephthalate film with a thickness of 0.054 mm) is used as a substrate, and the powder is applied to the substrate in an even continuous layer, followed by melting to the formation of the polymer monolithic structure, which is subjected to calendaring at a temperature of 40-50 ° higher than the melting temperature of the polymer, and pressure 15-40 MPa, followed by cooling to room temperature and separating the substrate from the polymer material.

The drawing shows a diagram of the installation for implementing the method for producing hot-melt adhesive gasket material. The installation consists of a conveyor belt 1, a hopper for a polymer with a metering device 2, a doctor blade 3, a heating device 4, a calender 5, guide rollers 6, a blasting device 7, a separation device 8, a receiving and receiving device 9, 11, 12.

A method for producing a hot-melt adhesive material is: a thermoplastic polymer in powder form is loaded into a hopper 2 with a metering device and fed to a conveyor belt 1 with a release liner 10, which is fed to the tape from a roll installed on the receiving and receiving device 9. The rake 3 aligns the polymer layer in thickness . The polymer layer on the substrate passes under the heating device 4, which provides a temperature corresponding to the melting temperature of the polymer. The rotation speed of the conveyor belt is set so that the transit time of the polymer under the heating device is sufficient to melt the polymer and sinter in the form of a film. The resulting semi-finished product on the substrate is fed through a guide roller 6 between the heated shafts of the calender 5, where under a pressure of 15-40 MPa (the pressure is selected depending on the selected characteristics of the products, primarily surface density) and a temperature 40-50 ° above the melting temperature of the polymer , there is a formation of the structure of the cushioning material. The resulting material, moving along the conveyor rollers 6, is cooled to 20-25 ° C by a stream of room temperature air supplied to the material by the blasting device 7. The cooled polymer material is separated from the substrate by a separation device 8 and the material and the substrate are fed to a receiving and receiving device where the material is wound onto the receiving shaft 11, and the substrate is wound on the shaft 12 and can again be used in the production process.

Using the developed method, cushioning materials based on the AKP-622 acrylic thermoplastic polymer, characterized by a melting point of 80 ° C and AKP-218, with a melting point of 130 ° C, were obtained.

It was established that for AKP-622 polymer the temperature of calender rolls should be 120-130 ° С, and for AKR-218 - 170-180 ° С, i.e. 40-50 ° above the melting temperature of the polymer. At a lower temperature, the appearance of the cushioning material worsens, unevenness in thickness appears. At a higher temperature, strong polymer flow begins and spreads over the surface of the substrate.

Changing the pressure between the calender shafts from 15 to 40 MPa, a material of different thickness and stiffness was obtained. At a pressure of less than 15 MPa, it is not possible to obtain high-quality hot-melt adhesive cushioning material, the structure of the material is non-monolithic, sections of incomplete melting and spreading of the polymer and unevenness in thickness are observed. At a pressure of more than 40 MPa, the integrity of the material is violated, cracks appear, the polymer with the substrate is healed by the calender shafts.

Samples were tested to determine the strength of the adhesive bonding during delamination according to GOST 28966.1-91. The method for determining the strength during delamination. The stiffness of the adhesive joints was determined according to GOST 10550-93. Canvases Methods for determining bending stiffness. The strength and elongation of the samples were determined according to GOST 3813-91. Method for determining tensile strength.

Depending on the pressure between the shafts, the material had the properties shown in the table.

As can be seen from the table, the proposed method for producing hot-melt adhesive cushioning material, allows to obtain materials characterized by a sufficiently high strength and adhesion to textile materials. By changing the pressure between the calender shafts from 15 to 40 MPa, it is possible to obtain cushioning materials of different thickness, surface density and stiffness, which will expand the range of cushioning materials. The resulting cushioning material can withstand storage at ambient temperature, the layers of material stored in the roll are not glued to each other.

Thus, the invention allows to obtain hot-melt adhesive cushioning materials that meet the requirements for these materials. The resulting material is not inferior to the prototype in strength characteristics, but surpasses it in adhesive strength, i.e. It has better adhesion to textile materials.

The proposed method of obtaining will save textile material, which is used as the basis in existing production, as well as expand the range of hot-melt adhesive materials.

Claims (1)

A method for producing a hot-melt adhesive material, comprising applying a thermoplastic polymer powder to a substrate, followed by calendering at a temperature higher than the melting temperature of the thermoplastic polymer, and cooling to room temperature, characterized in that the acrylic thermoplastic polymer powder is applied in a continuous even layer onto a polyethylene terephthalate film substrate, calendaring carried out at a temperature of 40-50 ° C higher than the melting temperature of the acrylic polymer, and a pressure of 15-40 Pa and the resulting material was separated from the substrate.