Method of natural leather shoe upper processing after stretching and lasting operations

FIELD: individual and household supplies.

SUBSTANCE: processing method for natural leather uppers after stretching and lasting operations involves high-frequency low-temperature unbalanced plasma effect in vacuum chamber with plasma generation air flow rate of 0.04-0.06 g/second for 180-280 seconds at 13-26 Pa pressure with discharge power of 0.7-2.0 kW.

EFFECT: enhanced shoe shape stability and adhesion durability in the wearing process.

1 dwg, 1 tbl

 

The invention relates to the footwear industry, mainly used for processing workpieces uppers of leather after obtain-protracted operations.

The closest analogue is the way the wet-heat treatment of footwear (AB. St. No. 528085, A43D 11/14, A43D 94/12, the authors Tagantsev TF, Mukhanov, GV, Lviv D.V., Yashkov A.A., Izotova PS, spirit CD, Zueva Z.A., Goloshchapov E.V., Popova M.N.)

The disadvantage is the low dimensional stability and adhesion strength of ready-made shoes in the course of its operation, which leads to deterioration of quality socks and lifetime of the Shoe.

Object of the present invention is to improve the shape and adhesion strength shoes during operation.

This object is achieved in that in the processing method of the workpiece uppers of leather after obtain-protracted operations processing of the workpiece shoes perform when exposed to low-temperature nonequilibrium plasma of high-frequency discharge in a vacuum chamber with a plasma gas flow of argon 0.04-0.06 g/C for 180-280 with, at a pressure 13-26 PA, with a capacity of discharge of 0.7-2.0 kW.

When processing leather billet uppers introduced into the plasma of high-frequency discharge, acquires a negative potential relative to the plasma and subjected to ion bombardero the ke plasma argon gas with an energy of 90 eV. Ions hitting the surface of the skin, recombine, so under the influence of electrostatic fields fiber skin billet uppers can be redistributed in the internal volume, which leads to modification of properties of the skin, i.e. to improve the physico-mechanical properties of the Shoe.

Processing RF plasma allows modification on the supramolecular level, the nanostructure of natural macromolecular materials (genuine leather) with the help of a volume processing of non-equilibrium low-temperature plasma. When exposed to RF-discharge of low pressure on the nanostructure of animal proteins occur conformational changes of macromolecules, leading to the structuring and razvlecheniy bundles of fibers, which allows for the regulation of their properties.

Due to conformational changes in the structure of the dermis, leading to the ordering of the amorphous phase increases the strength and rigidity of the material, due to the splitting of the fibre bundles and grinding subfebrile increases skin elasticity, resulting in improved molding ability of materials uppers. Due to changes in the fibrous structure of the dermis, accelerated liquid finishing processes, allowing them to intensify and improve the performance properties of the skin.

Pic is b exercise on plasma installation, RF, which was created on the basis of the industrial installation VCI 11-60/1,76.

Installation (drawing) includes a gas supply system (1), vacuum chamber (2), the electrodes (3), the pumping system (4), the vacuum unit (5), the discharge chamber (6), cooling system (7), high frequency (HF) generator (8), vacuum piping (9).

The method is as follows.

In a vacuum chamber (2) the workpiece is placed in the gap between parallel vertically spaced electrodes, and (3) along the flow of plasma gas. Produce the pumping of air from the vacuum chamber (2). In a vacuum chamber (2) putting the working gas. Adjustment of the valve connecting the vacuum chamber (2) to the pumping system (4), establish the set pressure. When applying to the electrodes (3) RF voltage in a discharge chamber (6) by heating of the plasma gas to a plasma to form a plasma stream - processing tool.

Under the action of electromagnetic fields is heated plasma gas argon to the state of plasma deposited power into the plasma 0.7 to 2 kW. Working pressure in the vacuum unit 13-26 PA, the exposure time of the high-frequency plasma 180-280 C.

Were tested in industrial conditions in a Shoe factory, JSC Spartak Moscow and CI "Leather and shoes" JSC "ZNIIK", Moscow. The tests were performed on the following equipment: break the th machine type RT-250 No. 1495, device type HPH-2 No. 163, INSO-2 No. 409. Test methods: GOST 9135-73 "Shoes. Method for the determination of total and permanent deformation, the delivery and back, GOST 938.22-71 "Skin. The method of determining vodopronitsaemosti and permeability under dynamic conditions", GOST 9718-88 "Shoes. Method for the determination of flexibility." GOST 938.18-70 "Skin. Method for determining the air permeability". GOST 938.17-70 "Skin. The method of determining the permeability". GOST 9290-76 "Shoes. The method of determining the strength of the thread of the seams details up."

The research results of the proposed method of processing workpieces in the table.

The operating modesIndicators of physico-mechanical properties
The sustainability of coverage, the number of bendsThe breaking load tensile 10 MPaProces sole, N/cmFlexibility N/cmThe permeability of the system materials billet upper, %Residual th deformation backdrop, mmResidual th deformation delivery, mmVozduha resizemode system materials billet top, ml/cm2Ěh The strength of the thread fastening, N/cmVodop makepost skin blanks in dynamic conditions min
The placeholder----------
No processing
3500020,542,6211,8180,51,012,2108,32
Offer
4500024,961,089,84250,30,547,5172,9728
Due to the fact that high-frequency processing in vacuum are not on samples of natural leather, and on the finished billet uppers of leather, then investigate the physico-mechanical properties of the ready Shoe.

Analysis of the data presented in the table shows that the method of processing the workpiece shoes made of natural leather after obtain-protracted operations will increase the dimensional stability and adhesion strength of the Shoe during operation, for this purpose, the optimal mode is the impact for 180-280 with, when the pressure in the discharge chamber 13-26 PA, with a capacity discharge 0.7 to 2 kW, the plasma gas flow of argon 0.04-0.06 g/s processing Method billet uppers of leather after obtain-protracted operations beyond the boundaries of these values leads to the degradation of physical and mechanical properties.

The advantage of this method compared to prototipo is, is to improve the shape and adhesion strength shoes during operation.

The method of processing the workpiece uppers of leather after obtain-protracted operations, characterized in that the processing of the workpiece-top shoes provide when exposed to low-temperature nonequilibrium plasma of high-frequency discharge in a vacuum chamber with a plasma gas flow of argon 0.04-0.06 g/C for 180-280 with, at a pressure 13-26 PA with power discharge 0.7 to 2.0 kW.



 

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