The skin, the method and the device for its production


C14B7/04 - by cementing or pressing together leather pieces, strips, or layers; Reinforcing or stiffening leather by means of reinforcing layers

 

(57) Abstract:

Usage: leather industry. The inventive skin contains polished mezdrovyj splits or polished skin lesions, or skin defects or damaged the face surface, or skin with selenamarie or smooth surface on the front surface of which is coated. The coating on the side facing the front surface of the split leather or skins, are made of thermoplastic and has microscopic irregularities, identical to the fine irregularities of the front surface of leather, skins or leather for full alignment of the corresponding front surface of the split leather, skins or leather. The surface is performed with predetermined characteristics of the received facial skin surface. The coating formed from the alignment layer, located adjacent to the front surface of leather, skins or leather, and a cover layer located above the leveling layer. A method of manufacturing a skin is to finish the front surface of the split leather or skins and subsequent deposition on the front surface of the leather or skin coating in the form of the mass, the lower part of which is a glutinous mass, by odnovremenno the containing polished mezdrovyj splits or polished skin defects, or damage the front surface, or skin with selenamarie or smooth surface on the front side which made the floor.

The invention also concerns a method of manufacturing a skin, comprising finishing the front surface of the split leather or skins with subsequent deposition on the front surface of the leather or skin coating in the form of the mass, the lower part of which is a glutinous mass by simultaneous effect on its temperature and pressure.

Finally, the invention concerns a device for the manufacture of leather, containing a means for applying a covering layer on finishing the substrate mounted on the conveyor, and means for pressurising and heating the coating layer is fixed on the workpiece material is made in the form of a press for hot pressing, the working plate which is mounted for movement toward finishing the substrate.

Due to the natural properties of the skin its products are used in many different areas. In the processing of leather in high-quality products the problem arises that in particular many varieties of leather, such as pork, often have unwanted traces. Such skin onofrey skin. Also saw, have a surface that is not appropriate as natural leather. Therefore, saw, seen as unimportant and, as a rule, not used for the manufacture of high quality products.

Undesirable extent, and in this case, the defects of the skin leads to defective material in the leather industry waste exceeds its tanning and as a rule considerably.

From the French patent N 2372895 known method by which the surface of the skin can be applied coatings. For this purpose, the surface of the skin by a hot-melt adhesive is applied film of synthetic material. Synthetic tape and glue deposited on silicone paper and covered with skin served between two cylindrical rollers. Converted to silicone paper roll heated and it warms up the paper and thus the hot-melt adhesive to melt and its temperature. With the passage lying opposite one another clamping cylinders skin and hot glue are pressed together, and thus the skin with tape. After separation of the carrier skin film from the silicon paper is embossed film and the separation of its residual plots from the skin.

The drawback is it only for fixing the film on the skin. Glue for this should be relatively long to remain in a liquid state so that it not only penetrates into the surface irregularities of the skin, but is drawn into the pores of her material. Thus the material of the skin hardens. It becomes brittle and prone to cracking. Soft and elastic quality of the skin thereby greatly lost.

The objective of the invention to improve the skin initially named kind so that it plots the visible surface had a pre-emption (pre-specified) characteristic and largely preserved its natural properties.

Now this task according to the invention is solved in that with the aim of improving quality by eliminating defects and irregularities of the skin use thermoplastic coating on its face towards the front side split leather or skins and that has microscopic irregularities that are identical to the asperities of the front side split leather, skins or leather for full alignment of the corresponding front side split leather, skins or leather, while the surface is performed with predetermined characteristics of the received facial skin surface.

By applying pokrytii, and, secondly, freely definable characteristic of the surface, facing toward dealing with her man. Although the coating fills the surface irregularities of the skin, but it does not penetrate into its pores, so that it does not make the leather brittle and retains its natural properties, in particular in respect of elasticity.

For making this skin roughness of the front side split leather or skins filled the floor, the bottom of which is applied in the form of a heated mass with thermoplastic properties on the front side of the leather or skin, while the outer surface is processed by embossing with predetermined properties. Thus, the softened thermoplastic can penetrate into the surface irregularities and fill them. Thermoplastic material in the soft state is not given the opportunity to penetrate into the pores of the skin so that it remains elastic. The surface here is not closed by the film.

This method can be implemented by a device to increase reliability, has the unwinding roller for unwinding the processed substrate finishing and coiling roller winder for already processed substrate. This device is simple in construction P> Further details of the invention appear from the following detailed description.

Other details of the invention ensue from the following detailed description and the attached drawings, in which examples are explained in preferred variants of the invention.

In the drawings shown:

Fig. 1 transverse incision is covered with a top layer of the underlying skin, which is formed from the alignment layer, the first coating layer and second coating layer,

Fig. 2 a cross-section of a coating layer, which is located on the carrier and is formed from a leveling layer, the first coating layer and second coating layer,

Fig. 3 transverse skin incision, the underlying skin which is equipped with a top layer, which is connected with the carrier,

Fig. 4, the device for producing a coating layer on the base skin,

Fig. 5, the device for producing a coating layer on the base skin, which has a feed device, formed by a heated calender.

Top layer 1 to cover the base of the skin 2 consists mainly of a leveling layer 3, which fills located in the area, limiting the underlying skin surface 4 of the base skin, and a cover layer 5, which teawnevaxia layer 6.

Levelling layer 3 is directly connected with the base skin 2. It is applied to the surface 4 of the base skin in the form of the alignment layer 7, which may be in the form of fairing powder. In addition, it is also possible to spray the alignment layer 7, or applied in the form of a solution. Levelling layer 7 made in the form of a thermoplastic, for example in the form of hot molten substance, which has a thermally activated adhesive properties. For example, the alignment layer 7 can be applied in the form of a dispersion, the water of which evaporates after application, but before pressing.

The covering layer 5 is made in the form of a homogeneous layer; however, it is also possible to form the covering layer 5 located one above the other private coating layers 8, 9. As a covering layer 9 provided the paint layer, which is made, for example, in the form of polyurethane varnish. However, it is also possible to form a private covering layer 9 of acrylate, polyamide or acetobutyrate.

Basic leather 2 made in the form of leather, but can also be provided with a top layer 1 leather of swine, cattle, goats, sheep and other animals suitable for use skins. To use the layer 3 are applied directly to the surface 4 of the base skin; however, it is also possible for at least the covering layer 5 is located in the area of the carrier 10 and the carrier 10 to transfer the coated alignment layer 3 surface 4 of the base skin. The covering layer 5 is applied to the carrier 10 connected with the base skin 2 leveling layer 3. However, you can also position as the covering layer 5, and the alignment layer 3 on the carrier 10 and put together on the surface 11 of the base skin. The covering layer 5 is directly converted to the base skin 2 surface 11 of the carrier. However, it is also possible between the surface 11 of the carrier and the surface layer 5 to have the separation layer 12, providing easy separation of the cover layer 5 and the carrier 11. The separation layer 12 can be made in the form of the separating varnish.

The carrier 10 is made in the form of a film of synthetic polymer, for example, polyester, polyvinyl chloride or polyethylene. However, you can also perform the carrier 10 of paper or metal, for example aluminum. Finally, the carrier 10 may also consist of a combination of synthetic material with metal.

The covering layer 5 is made of color, but you can also perform the covering layer 5 is colorless, transparent or colored. In addition, you can prijava surface 11 is made mostly of a smooth, however, it is also possible to provide the carrier 10 with the lettering, which is performed after the pattern of the surface structure necessary skin. For this purpose, for example, can be used structured paper, which is equipped with a separating layer, for example a layer of silicon.

Device for coating the base of the skin 2 a top layer 1 is composed mainly of a device for coating, which is movable in the direction of the second working plate 13, the working plate 14. The second working plate 13 is in the area facing the base skin 2 loading extension base skin 2 top layer smooth supporting the clamping surface 15. Device for coating made in the form of the press, which is moving in generally perpendicular to the base skin 2 the clamping surface 16. In the area of the second working plate 13 is heating this surface heating device 17.

The carrier 10 is first applied coating layer 5, and then levelling layer 3. However, it is also possible initially to cover the carrier 10 of the separation layer 12, or only to connect the covering layer 5 with the carrier 10.

Then the carrier 10 is sent to the base area of the skin 2, where the base skin 2 pressed respo with basic skin 2. The second working plate 13 heated press and connects the leveling layer 3 with the surface 4 of the base skin. The second working plate 13 depending on the time of pressing is heated to a temperature in the range from 120 to 140oC. However, it is also possible to envisage other temperatures, given in accordance with the material of the alignment layer. The pressing force has a value ranging from 20 to 50 kgf/cm2. However, you can also depending on the underlying skin 2 and the material of the alignment layer to provide other tonnage. Pressing takes time from 3 to 8 C. However, depending on the used materials can be provided by other pressing time.

Levelling layer 3 can be applied, for example, in the form of a powder or film. As a leveling layer, you can select the polyurethane. In addition, however, the polyurethane can be applied also from the hot liquid and dried in air under the influence or without exposure to humidity.

When manufacturing the alignment layer 3 must take into account the existing properties of the skin with one hand and the desired appearance of the final product on the other hand. When applying viravnivaite severely damaged skin, which is usual in the trade of skin damage, it is advisable to apply the alignment layer in an amount of from 25 to 40 g/cm2. To improve the quality of pork skin is also advisable to apply a levelling layer in an amount of from 25 to 40 g/cm2. In contrast to normal leather with strong damage required amount of the leveling layer is from 40 to 50 g/cm2in order to obtain a smooth surface.

To this leveling layer 3 was firmly connected with the base skin 2, the alignment layer 7 is the effect of pressure and temperature. For this purpose it is expedient selected temperature 130oWith by which in the course of 3 with impacts on sprecovery with basic skin 2 leveling layer 3. In addition, you can choose the temperature 125oWith by which in the course of 4 to 5 with an impact on the underlying skin 2. Finally, it is permissible to have an impact at a temperature of 120oWith over 8 on the leveling layer 3. When appropriate, use a pressure of at least 20 kgf/cm2.

When transferring the alignment layer 3 and a cover layer 5 with the carrier 10 on n the th skin 2 the surface of the separation layer, for example, from silicone. Preferably used separating varnish, which improves load-bearing properties and quality to the touch. Then, on this layer of silicone is applied to the covering layer 5. Of course, that between the separation layer 12 and top layer 12 and the surface layer 5 may be provided by pressure, for example low. This pressure may be provided one or more times. For application of a coating layer 5 depends on the consistency of the coating material can be applied by various application methods; for example, the covering layer 5 may roll or be smeared. In addition, there may also apply other methods of application.

Then on the covering layer 5 is applied to the alignment layer 3. This can also apply various methods of coating, such as smearing, rolling or napressovyvanie. If, for example, the covering layer 5 is applied to the alignment layer 3 from the dispersion, for example by evaporation of the water portion of the variance is called an expedient manner. Solid leveling a lot of the hot phase is applied on the covering layer 5 for the purpose of connecting a leveling layer 3. Forming a leveling layer 3, the substrate can be applied to the covering layer with the aid of revnivui substrate is rolled or spread on the covering layer 5.

Depending on the desired surface structure of the final product for crushing covered carrier 10 with the base skin 2 can be used transmitting force pressovaniya on the carrier 10 working with anti-squeak plate surface, which is designed in accordance with the desired surface structure of the final product. For example, the clamping surface 16 table press may have a smooth surface, if the final product should have a smooth surface. Such a smooth surface can be used, for example, for the manufacture of patent leather. However, if the final product should have a grained surface, in press table is used equipped with a drawing grained plate 18, through which is provided on the grained plate 18 drawing is transferred to the alignment layer 3. Depending on the generated picture it can be formed by crushing of the carrier 10, when the alignment layer 3 is connected with the base skin 2. When deep impressions, in which, for example, there may be significant differences in height (deep scars), such as ostrich or crocodile skin, expediently carried out two pressing, the first of which prinoides 10 is created by drawing a flat hem. In addition, the figure can be created also by using molded accordingly the carrier 10, for example using include drawing paper, addressed to the cover layer 5, the surface of which is coated with silicone. For this purpose, the carrier 10 may have a smooth or matte surface, depending on what should be produced of leather, smooth or matte.

When using the carrier 10, which is only the covering layer 5, due to the temperature of the second working plate 13 is activated adhesive already on the base skin 2. Due to activation of the alignment layer 3 in the beginning becomes pasty and spreads at a pressure of from 40 to 80 kgf/cm2. Become pasty levelling layer 3 penetrates into the surface 4 of the base skin and evens out the front side of the base of the skin 2. In addition, become pasty levelling layer 3 aligns existing on the surface 4 of the base skin defects. In addition, in the pasty state of the alignment layer 3 by means of putting pressure on the covering layer 1 grained plate 18 is the design surface 6 of the alignment layer. If necessary, the surface 11 of the carrier as the surface 4 of the base skin irregularities on the basis of the weight of the alignment layer 3, which fills irregularities and in addition contributes to the design surface 6 of the alignment layer. The weight of a leveling layer 3 should be chosen in such a way that any one could create the desired surface 19 of top layer regardless of the size of the irregularities. After a sufficient connection base skin 2 with the alignment layer 3 and the surface layer 5, the carrier 10 is removed from the coating layer 5 and you can see the arrow pointing away from the leveling layer 3, the surface coating layer 5. You can also connect the leveling layer 3 with a top layer 5 without the use of the carrier 10 and to apply a combined product at basic skin 2.

You can also apply a coating to a base skin 2, instead of using desktop press the calender 20. For this purpose, equipped with a heating device 17 calender 20 is located against the roller 21. Between the pressure roller 21 and the calender 20 is slit 22, the height of which corresponds to the thickness of the base of the skin 2. Through the slit 22 extends equipped with a top layer 1, the carrier 10, on a surface 19 of a coating layer which is superimposed cover basic skin 2. Using supplied to the conveying direction (the arrow) nick 21. The speed of rotation as the calender 20 and roller 21 is set so that the base skin 2 resides within the slot 22 until such time as the alignment layer 3 due to heating by using a heating device 17 will not become so soft, that he might establish the connection with the surface 4 of the base skin. In order to ensure the wrap without friction base skin 2 in the zone of the roller 21, the pressure roller 21 is fitted on the perimeter of the calendered coating 23, which prevents the adhesion of the base skin 3, when the underlying skin 2 passes the slit 22.

After passing the basic skin 2 through the slit 22 is turned to the calender 20 bottom side of the base of the skin 2 is coupled with a top layer 1. Now ready underlying skin 2 may be removed from the carrier 10 is placed on the warehouse 24. Winder for finishing processed substrate has a winding roller 25, and for unwinding the finishing of the substrate unwinding roller 26.

Example 1. Pork skin with one hand grinded grain abrasive paper 170. Then, on the surface of the paper is applied to a pigmented synthetic lacquer that must be transferred as a covering layer on the pork skin. Sateg/m2. In the case of this glue it comes to the polyamide, for example, "Euroline" firm shares". Covered so the paper overlaps the adhesive layer on the polished surface of the pig skin and pressed at a pressure of 40 kgf/cm2and a temperature of 130oC for 3 seconds Then the paper as the material of the carrier can be removed from the top layer.

Example 2. On serves as the material of the carrier film of a synthetic polymer, a polyester film, is applied to the separating varnish, for example, C. A. C. Hattie Eastman". This separation lacquer as a top coat layer of aliphatic polyurethane firms Bayer, which also may be colored or may be transparent. This polyurethane is applied dry density of 15 g/m2. This leveling layer as an adhesive is applied to the polyamide density of 45 g/m2. Covered with a film adhesive side is applied on the polished surface of the split leather and pressed at a pressure of 40 kgf/m2and a temperature of 130oC for 3 seconds When the punch has a grained plate for embossing coating layer with a grained structure. After crushing the film of a synthetic polymer with the separation layer is removed from the top layer.

2. This leveling layer may be coated with a soluble dye. As soluble dye is taken into account dye "Sudan" company "BASF". Covered with silicone paper manually superimposed on the grained plate. Then covered with silicone paper is superimposed processed base skin and then press table is moved in the direction of the second working stove. When this alignment layer is shrinked in the irregularities of the underlying skin and creates a surface coating layer, which is fitted to the figure grained plate. The crushing continues until until you achieve good adhesion of the alignment layer with the surface of the base skin. The time allocated is so limited that needed to heat equalizing layer heat could not penetrate to the underlying skin. After the pressing process table of the press away from controvery, so that the base skin can be removed with a grained plate. Then, the surface coating layer is removed paper.

1. Skin containing polished mezdrovyj splits or polished the skin pores of the second surface, on the front surface of which is coated, characterized in that, to improve quality by eliminating damage and uneven skin tone, the coating on the side facing the front surface of the split leather or skins, are made of thermoplastic and has microscopic irregularities, identical to the fine irregularities of the front surface of leather, skins or leather for full alignment of the corresponding front surface of the split leather, skins or leather, and the surface coating is made with predetermined characteristics of the received facial skin surface.

2. The skin under item 1, characterized in that the coating formed from the alignment layer, located adjacent to the front surface of leather, skins or leather, and a cover layer located above the leveling layer.

3. The skin on the PP.1 and 2, characterized in that the alignment layer at least in the area of pre-forming coating made with thermoplastic properties.

4. The skin on the PP.1-3, characterized in that the alignment layer at least in the area of pre-forming coating made in the form of activated when heated glue.

5. The skin on the PP.1-4, characterized in that the alignment layer at the, that levelling layer at least in the area of pre-forming coating made of a transparent-colored.

7. The skin on the PP.1-6, characterized in that the alignment layer at least in the area of pre-forming coating made color.

8. The skin on the PP.1-7, characterized in that the covering layer made of color.

9. The skin on the PP.1-8, characterized in that the covering layer at least partially consists of varnish, rolling in the solid state of water by ultraviolet radiation.

10. The skin on the PP.1-9, characterized in that the covering layer is at least partially made of polyurethane.

11. The skin on the PP.1-9, characterized in that the covering layer is at least partially made of acrylate.

12. The skin on the PP.1-9, characterized in that the covering layer is at least partially made of polyamide.

13. The skin on the PP.1-9, characterized in that the covering layer is at least partially made of acetobutyrate pulp.

14. The skin on the PP.1-13, characterized in that the covering layer at least in the zone of the preform is made transparent.

15. The skin on the PP.1-14, characterized in that the covering layer on the different topics that the covering layer at least in the zone of the preform is made colour.

17. The skin on the PP.1-16, characterized in that the covering layer consists of at least two, arranged one above the other, private top layers.

18. The skin on the PP.1-17, characterized in that at least the upper cover layer has the property of improving the adhesion created by the separation layer.

19. The skin on the PP.1-18, characterized in that at least the top private-coating layer is made resistant to solvents.

20. The skin on the PP.1-19, characterized in that the front surface of leather with a strong damage caused to the alignment layer in an amount of from 40 to 50 g/cm2.

21. The skin on the PP.1-19, characterized in that the front surface of the skins with heavily grained natural surface from its average damage of the alignment layer is applied in an amount of from 25 to 40 g/cm2.

22. The skin on the PP.1-19, characterized in that the front surface of skin with a smooth surface with slight damage to the leveling layer is applied in an amount of from 20 to 25 g/cm2.

23. The skin on the PP.1-22, characterized in that the leveling is the leveling layer deposited at a temperature of 120oC for at least 8 C.

25. The skin on the PP.1-23, characterized in that the alignment layer is deposited at a temperature of 125oWith effect for about 4 to 5 C.

26. The skin on the PP.1-23, characterized in that the alignment layer is deposited at a temperature of 130oFrom acting for about 3 seconds.

27. The skin on the PP. 1-26, characterized in that it has a flat hem, printed on the alignment layer.

28. The skin on the PP.1-26, characterized in that it has a deep hem, made in the stamping process.

29. The method of manufacturing of leather, which consists in finishing the front surface of the split leather or skins and subsequent deposition on the front surface of the leather or skin coating in the form of the mass, the lower part of which is a glutinous mass, by simultaneous exposure to temperature and pressure, characterized in that the roughness of the front surface of leather or skins filled the floor, the bottom of which is in the form of heated adhesive mass with thermoplastic properties are placed on the front surface of the leather or skin, and the outer surface of the cover handle embossed with predetermined properties.

30. The method according to p. 29, featuring the of irregularities, and then it is applied coating layer.

31. The method according to PP.29 and 30, characterized in that the alignment layer is at least partially applied in a hot state.

32. The method according to PP.29 and 30, characterized in that the alignment layer at least partially roll in the hot condition.

33. The method according to PP.29-32, wherein the alignment layer is at least partially applied using spray surface coatings in hot condition.

34. The method according to PP.29 and 30, characterized in that the alignment layer is at least partially applied in the form of a dispersion, the water of which is then evaporated.

35. The method according to PP.29 and 30, characterized in that the alignment layer at least in the zone of the preform coating is applied in the form of fairing powder.

36. The method according to PP.29 and 30, characterized in that the alignment layer is applied as a hot melt polyurethane.

37. The method according to PP.29-35, characterized in that the alignment layer is applied to the polyamide.

38. The method according to PP.29 and 30, characterized in that the alignment layer is applied complex polyester.

39. The method according to PP.29-38, characterized in that the us is in an amount of from 20 to 25 g/cm2.

40. The method according to PP.29-38, wherein the alignment layer is applied on the front surface of the skin with highly grained surface with average damages in the amount of from 25 to 40 g/cm2.

41. The method according to PP.29-38, wherein the alignment layer is applied on the front surface of the split leather pig skin in an amount of from 25 to 40 g/cm2.

42. The method according to PP.29-38, wherein the alignment layer is applied on the front surface of the split leather with heavy damages in the amount of from 40 to 50 g/cm2.

43. The method according to PP. 36-42, wherein the alignment layer at a temperature of 120oWith at least about 8 pressed with the front side of the split leather or skins.

44. The method according to PP.29-42, characterized in that the alignment layer is pressed with outer surface of leather or skins at a temperature of 125oC for 4-5 sec.

45. The method according to PP.29-42, characterized in that the alignment layer is pressed with outer surface of leather or skins at a temperature of 130oC for 3 seconds.

46. The method according to PP.29-45, characterized in that the alignment layer is pressed with the base skin under pressure in the range from 20 to 50 kgf is ASCII figure with the help of grained plate for one crossing at a pressure of 20 kgf/cm2.

48. The method according to PP.29-46, characterized in that the alignment layer after napressovannye on the face surface of leather or skins during the first stage of compression is applied flat figure during the second stage of compression.

49. The method according to PP.29-48, characterized in that the covering layer is applied on the carrier, and then it is transferred to the skin.

50. The method according to PP.29-49, characterized in that the coating is applied as a single coating layer and one alignment layer and then both layers are transferred onto the obverse surface of leather or skins.

51. The method according to PP.29-50, characterized in that the covering layer is applied from a few private top layers with the top private covering layer facing the carrier, causing the carrier as a layer for subsequent separation of the skin from the media.

52. The method according to p. 51, characterized in that the top private cover layer is applied in the form of varnish to improve the quality of the coating to the touch.

53. The method according to PP.51 and 52, characterized in that the top private cover layer is applied in the form of acetobutyrate pulp.

54. The method according to PP. 50-53, characterized in that on the upper surface of the top layer connected with the carrier, nab is causesa fact, that the covering layer roll levelling layer at least partially in the hot condition.

56. The method according to PP.50-53, characterized in that the covering layer is applied levelling layer in the hot condition of the nozzles for applying surface coatings.

57. The method according to PP.50-53, characterized in that the covering layer is applied levelling layer at least partially in the form of a dispersion.

58. The method according to PP.50-53, characterized in that the covering layer is applied levelling layer at least partially in the form of fairing powder.

59. The method according to PP.50-58, wherein after connecting the top layer with the alignment layer and with outer surface of leather or skins free media is removed from the surface of a coating layer, facing away from the front surface of the split leather or skins.

60. Device for the manufacture of leather, containing a means for applying a covering layer on finishing the substrate mounted on the conveyor, and means for pressurising and heating the coating layer is fixed on the workpiece material is made in the form of a press for hot pressing, the working plate which is installed with the possibility of AC is matavai roller for unwinding the processed substrate finishing and coiling roller winder for finishing processed substrate.

61. The device according to p. 60, wherein the second working plate has a smooth supporting the clamping surface and the working plate is installed with the possibility of reciprocation.

62. The device according to PP.60 and 61, characterized in that the second working presser plate has a bearing surface with applied embossed on it.

63. The device according to PP.60 and 61, characterized in that the working plate press for hot pressing is made in the form established with the possibility of rotation of the calender.

64. The device according to p. 63, characterized in that the working surface of the calender is made smooth.

65. The device according to p. 63, characterized in that the working surface of the calender at least in some areas of its surface is embossed.

 

Same patents:

The invention relates to the leather industry and can be used for finishing leather

The invention relates to chemical treatment of skins, in particular to the manufacture of special types of leather, and can be used in making leather for Shoe uppers from leather obtained from raw cattle

The invention relates to chemical treatment of skins, in particular, to methods for production of special kinds of skin and can be used in making leather for garment

The invention relates to the production of synthetic wax emulsions and can be used to finish the surface of the skin

The invention relates to chemical treatment of skins, in particular for finishing the surface of the skin, and can be used for covering the dyeing of natural leather for Shoe upper

Method of finishing // 2017825

FIELD: leather industry.

SUBSTANCE: semifinished product is degreased, neutralized, dyed, and lubricated. Dyeing is performed in two washing-interrupted steps with anionic black dye consumed in amount 0.5-0.6% of the weight of semifinished product in each dyeing step. Lubrication is followed by retannage with chrome tanner in amount 0.6-1.0% of the weight of semifinished product (calculated for chromium oxide) and treatment with 0.8-1.0% of spindle oil.

EFFECT: achieved deep black color and high performance characteristics.

1 tbl, 5 ex

FIELD: light industry.

SUBSTANCE: powdered thermoplastic polyurethane with reduced melting point is applied on fur article parts in most wear place, said polyurethane being prepared from 4,4-diphenylmethanediisocyanate, poly(butylene glycol adipate) and 1,4-butanediol serving as chain extension agent. Thus treated part is then pressed at 64-75°C and remained to lie.

EFFECT: improved quality of fur articles due to increased hair-to-skin tissue binding strength, resistance of hair coat against wear, and increased lifetime of clothes.

FIELD: leather industry.

SUBSTANCE: invention relates to finishing of various-destination leathers made from various types of raw skins and consists in consecutively applying layers of soaking ground, covering paint, and fixing agent. After applying each layer, leather is dried for 5 to 50 sec in microwave fields at field intensity 10000-15000 v/m and power 300-3500 W.

EFFECT: expanded technological possibilities and improved quality of coating.

1 tbl, 5 ex

FIELD: tanning industry.

SUBSTANCE: process is conducted in vertical mill to which soot, induline, kerosene and diesel fuel are introduced. Then components are mixed and slow heating the apparatus and its content is started after which mixing is switched off and slow heating of mill content is continued. Upon expiration of said time, acids or their compositions, white spirit and fatty additive are introduced and chemical mass-exchange process is performed at spontaneously fixed temperature due to thermal effects of this process and natural cooling at the beginning and at the end, as well as due to forced cooling at intermediate stage characterized by high rates of temperature at maximum of 140-150°C. At the moment when forced cooling is discontinued, 0.5-1.5 h before discontinuation of mixing and beginning of withdrawal at temperature of 80-115°C, 43-52-% solution of aluminum salts and C10-C20 of carboxylic acids is introduced into product being prepared.

EFFECT: facilitated procedure; increased amount of product.

1 tbl, 15 ex

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

FIELD: leather industry.

SUBSTANCE: preparation of composition is conducted on vertical-type bead mill. Induline, kerosene, and diesel fuel are consecutively charged into mill before stirring mechanism is energized, after which apparatus and contents thereof are slowly heated. Stirring is then stopped for 1 h while slow heating of mill contents is continued. When specified time expires, carboxylic acid or acid mixture, white spirit, fat additive, and aluminum oxide or hydroxide are added. Mechanic stirring is then switched on and contents of the bead mill are ground and the process is carried out at spontaneously fixed temperature caused by heat effects of the processes and natural cooling. When temperature is lowered to 85-120°C, desired product is discharged.

EFFECT: simplified process and increased product discharge degree.

1 tbl, 19 ex

FIELD: leather industry.

SUBSTANCE: invention relates to wax emulsions used in coating pain composition designed for finishing genuine leathers and provides a wax emulsion component, which represents polyvinylacetate dispersion containing non-plasticized polyvinylacetate in amount at least 45 wt %, content of polyvinylacetate dispersion in wax emulsion ranging from 40 to 80%. Proposed component when used in wax emulsion allows leather coatings to be obtained manifesting good organoleptic properties, high temperature resistance, low tackiness, and agreeable leather to the touch at moderate cost of wax emulsion.

EFFECT: improved consumer's quality and enlarged resource of wax emulsion components.

1 tbl, 6 ex

FIELD: leather industry.

SUBSTANCE: method, which is suitable for finishing chrome leathers, comprises consecutively applying coating layers followed by action with low-temperature plasma at generator lamp anodic current intensity 0.2-0.6 A. Action of low-temperature plasma is effected for 180-240 sec at pressure 13.3-26.6 Pa in discharge chamber and consumption of plasma-forming gas (argon) 0.035-0.04 g/sec. Method is implemented on high-frequency plasma installation.

EFFECT: increased adhesion of coating to dry and wet leather, dye penetration depth, resistance to repetitive bends, and strength at better quality of leather.

FIELD: process engineering.

SUBSTANCE: proposed method comprises eliminating defects representing damages sports (3) in layers (2) formed by recesses in skin (1) with natural grain patter. These defects are eliminated as follows, i.e. water or slightly foamed plastic suspension is forced into aforesaid recesses, the said suspension containing ultimate solid particles. Then skin (1) is dried, surface (4) of the layer of grain pattern (2) is subjected to pressure and thermal treatment with the help of pressure roller at least 100C. Note here that plastic mass is formed in aforesaid recesses that contains hollow tiny balloons (5) made up of solid particles to completely fill the said recesses (dwg. 1).

EFFECT: higher quality.

13 cl, 1 dwg, 1 ex

FIELD: process engineering.

SUBSTANCE: all layers of undercoat and finish paint are applied on leather subjected, prior to drum painting, to low-temperature non-equilibrium plasma of high-frequency discharge. Exposure is performed for 241 to 280 seconds in discharge chamber at 26.7 to 30.0 Pa, flow rate of plasma-forming argon making 0.041 to 0.06 g/s at discharge power of 0.7 to 2 kW.

EFFECT: increased depth of paint penetration, improved quality of ready leather.

1 dwg, 1 tbl

Up!