Method of forming of volumetric and curvilinear components for an article

FIELD: light industry; methods of forming of volumetric and curvilinear details for an article.

SUBSTANCE: the invention is pertaining to the field of light industry, in particular, to the methods of forming of volumetric and curvilinear details for an article is intended for usage in light industry at forming volumetric and curvilinear details for articles made out of a leather, predominantly - clothing. The method consists that on the surface of the flesh side of hide of the flat component of the article made out of leather deposit the polymeric composition containing the following elements (in mass %): - polyvinyl acetate homopolymeric coarse-dispersed plasticized dispersion - 20-35; - dibutyl phthalate (DPHT) - 1.5-15; - water - the rest. The composition may be deposited in the form of a net on in advance prepared templates. After that the component of the article is dried at an indoor temperature. Then the component of the article is formed, for example, by hot pressing at 70-90°C during 1.5-2.0 minutes. And fix the gained form by chilling. The invention ensures improvement of quality of the articles made out of leather due to increased the form stability of components of the article.

EFFECT: the invention ensures improvement of quality of the articles made out of leather due to increased the form stability of components of the article.

4 cl

 

The invention relates to light industry, and in particular to methods of forming three-dimensional and curved parts, leather goods, mainly clothing.

The known method the wet-heat treatment of leather footwear, which consists in the processing of flat blanks for parts of footwear in the environment chemically active water vapor containing bi - and polyfunctional thermosetting or thermoplastic resin, followed by shaping, drying parts with hot air and fixing the shape by cooling. (Patent RF №1681831, C And 43 D 11/14, 1991).

The disadvantage of this method is the use for machining the working environment containing harmful substances: chlorine and formaldehyde.

There is a method of forming blanks uppers of leather, consisting of shaping parts deformation, with the subsequent drawing on boterman side of the skin of thermoplastic adhesive compositions and fixation of the shape. (Were Fukin VA, Kalita A.N. Technology of leather goods: the Textbook for high schools. At 2 o'clock B1 - M: Legprombytizdat, 1988, pp. 162-192).

Due to the use of thermoplastic adhesive compositions parts of the product have increased stiffness, which limits the scope of application of this method.

The closest to the technical nature of the claimed method is a method of manufacturing a molded fur and leather products, the conclusion is audica in the direct application of a polymeric composition based on collagen boterman side leather flat parts, drying and subsequent shaping and fixing the shape by cooling. (Leather and footwear industry, 2002, No. 3, page 43).

The use of this method does not provide a sufficiently high dimensional stability of the parts, leather goods, particularly clothing, because of the possibility of exfoliation of the polymer film from the surface of the skin, because the composition does not penetrate into its structure. The result of this deteriorating quality leather goods and, consequently, decreases their lifespan.

The objective of the invention is to improve the quality of products from skin by improving the shape of the product details.

The problem is solved as follows. In the method of forming three-dimensional and curved parts of the skin where boterman side of the skin of a flat part of the product is applied polymer composition, dried at room temperature, give details in the form, for example, by hot pressing at 70-90°C for 1.5 to 2.0 min, and then fixed by cooling. As polymeric composition use composition of the following composition, wt.%:

Dispersion of polyvinyl acetate
homopolymer coarse
plasticized20-35
Dibutyl phthalate (DBP)1,5-15
Waterrest

The selection of the polymer components of the composition attributable to the following. Dispersion of polyvinyl acetate homopolymer coarse plasticized environmentally friendly, harmless to human health, odorless, non-flammable, cheap, has good adhesion to the skin. Dibutyl phthalate is used to reduce the stiffness of elements.

The most optimal method of applying a polymer composition to the details of the product, such as service, is the application in the grid. This method of applying a polymeric composition the best way to preserve the hygienic properties of the skin while giving the details of the item required shape. You can adjust the width of the strips of the grid and the distance between them depending on the requirements of stiffness requirements for different parts of the product. For applying the composition in the form of a grid is proposed to use a pre-prepared templates, which are made of thin sheet metal. To impart greater rigidity necessary to increase the width of the strips of the grid and to reduce the distance between them.

When using the proposed method of forming three-dimensional and curved parts of the product increases the dimensional stability of parts isdel the th of the skin, resulting in improved quality and, as a consequence, the duration of the lifespan of products.

A specific example of the method.

Cut out detail shelves jackets for women. Choose a pre-prepared template for the deposition of polymeric compositions in the form of a grid, the width of the strips which is at the top of the shelves is 2 mm, and the distance between the strips 5 mm; the width of the stripes in the middle part of the strip is 1 mm, and the distance between the strips 7 mm Various width strips and the distance between them at the top and middle of the shelves are related to the fact that in the upper part of the details products you want greater rigidity than the average. Template selection due to the fact that achieved when using the stiffness at the top of the shelves is 17.7 mV, and the average is 12 mV, which corresponds to the base stiffness values for cushioning materials.

Then on a flat workpiece parts shelves impose the selected template and using, for example, roller or spray applied to boterman side of the skin polymer composition of the following composition, wt.%:

Dispersion of polyvinyl acetate
homopolymer coarse
plasticized33
Deeb is deltalat (DBP) 5
Waterrest

Then the part is dried at room temperature 20-22°C. After drying, the details give a desired shape by hot pressing at 70-90°C for 1.5 to 2.0 minutes Later form part of the product is fixed by cooling.

1. Method of forming three-dimensional and curved parts of leather goods, including drawing on boterman side of the skin of a flat part of the product polymer composition, drying, shaping the parts and fixing it cooled, characterized in that for application use polymer composition containing the following components, wt%:

Dispersion of polyvinyl acetate
homopolymer coarse
plasticized20-35
Dibutyl phthalate (DBP)1,5-15
WaterRest

2. The method according to claim 1, characterized in that the polymer composition is applied in the form of a grid.

3. The method according to claim 1 or 2, characterized in that the polymer composition is applied using a template.

4. The method according to claim 1, characterized in that the form details make hot pressing at 70-90°C for 1.5 to 2.0 minutes



 

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