JPS5920720B2 - How to pattern leather - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for patterning leather, which is based on a sandblasting method and is designed to pattern the leather surface.

Sandblasting is generally used as a method for adding patterns to the surfaces of leather, glass, metal, etc., to achieve surface treatment.

Traditionally, the sandblasting method for creating patterns on the surface of ceramics or glassware involves placing a mask on the glassware, etc.
A method for forming a pattern by polishing the exposed surface to make it rough is disclosed in Japanese Patent Application Laid-open No. 149390/1983.
In addition, a method for patterning metal and stainless steel surfaces by roughening (matte finish) is disclosed in JP-A-56-150189, and a method for patterning leather surfaces is disclosed in JP-A-56-150189. It is disclosed in Japanese Patent No. 56-18700.

The above leather surface treatment involves fixing a mask sheet such as a film made of plastic or photosensitive resin with the adhesive force of the adhesive layer provided on the back side, and sandblasting the entire surface to roughen the leather surface. After the surface was worn out, the mask sheet was removed and a pattern was applied.

In addition to the mask sheet, a layer made of photosensitive resin, a silk screen ink resist layer, etc. may be provided.

In any case, in the prior art described in the above-mentioned publication, the adhesive surface of the mask sheet, which had an adhesive property, becomes It becomes plasticized, becomes extremely sticky, and sticks to the epidermis of the leather surface.

For this reason, when the patterned mask sheet is peeled off after cooling, stain-like marks may remain on the area where the mask sheet was applied, and the surface of the leather may peel off along with the mask sheet when peeled off, so surface treatment may be required. There was a serious drawback in that the commercial value of the leather was diminished later.

Furthermore, when coloring the patterned part of the satin fabric, coloring agents such as lacquer and paint were applied to the rough surface of the satin fabric, which weakened the adhesion and caused the coloring to be applied to the rough surface of the satin fabric. The applied colorant often peels off, detracting from its commercial value.

The present inventors have discovered a new patterning and coloring method for leather using an adhesive mask sheet, and have completed the present invention.

A first object of the present invention is to provide a method for patterning leather using a mask sheet that has a suitable adhesion force to the leather surface.

A second object of the present invention is to provide a method for patterning leather using a mask sheet in which the mask sheet can be completely peeled off after sandblasting.

A third object of the present invention is to provide a method for patterning leather using a mask sheet in which the mask sheet can be completely peeled off.

The object of the present invention is to heat and impregnate the surface of the leather to be patterned with oils and fats containing wax, and after cooling,
A pattern is created on a part of the leather surface by adhering an adhesive sandblasting mask sheet and spraying particulate abrasive material onto it, and then applying one or two particulate pigments as needed. Texturing of leather is achieved by a method characterized by applying a monochromatic or multicolored color by spraying with seeds or more and peeling off said mask.

As the mask sheet used in the patterning method of the present invention, a plastic sheet, a rubber sheet, a sheet made of a photosensitive resin film, etc. are used, and the mask sheet has a die-cut portion for applying the shape pattern.

When adhering and fixing this mask sheet to a leather surface (tanned leather, artificial leather, etc.), one of the features of the present invention is to apply a wax-containing oil and fat to the leather surface as an adhesion layer.

In the patterning method of the present invention, the wax composition used for the adhesive layer has a melting point of about 70°C to 120°C, and waxes such as solid paraffin and carnauba wax are used, and the solid content is about 25°C. The composition contains ~45% by volume of wax, more preferably about 30-40% by volume of wax, with the balance consisting of fats and oils and organic solvents.

As the fats and oils used here, oleic acid, lauric acid, lanolin, palmitic acid and their esters are used, and as the organic solvent, aliphatic hydrocarbons having 9 to 1 carbon atoms are used.
A paraffinic solvent mainly composed of 2 is used.

The composition ratio is determined as appropriate depending on the use of the leather.

In the patterning method of the present invention, as shown in FIG. After heating and impregnating the mask sheet 3 with the adhesive layer 4, the mask sheet 3 is impregnated with the melted fat layer 4 of the adhesive layer 4.
It can be fixed with the adhesive force of b, or it can be cut out and shaped.
The adhesive layer 4 is applied to the back surface of the mask sheet 3 on which the contour is applied.
The composition may be applied uniformly in advance, or it may be applied uniformly to the back side of the mask sheet 3 after die cutting, and the mask sheet 3 provided with the adhesive layer 4 may be pasted on the leather surface 5. good.

By injecting sand particles 2 from the sandblasting nozzle 1 to the leather surface to which the mask sheet 3 is attached and fixed, based on a conventional method, the exposed part of the leather surface 5 is polished and the hair is removed. 6 and the pattern is engraved.

The patterning of the present invention is a method, and when coloring a patterned part, as shown in FIG. By spraying one or more types of pigments 8 in the form of pigments or particulates from the pigment spraying nozzle 7, the pigment particles are directly infiltrated and adhered to the raised and roughened portion 6a.

The colored pigment 9 is then fixed to the patterned portion.

In addition, when using multiple colors or color-coding, separate mask sheets can be stacked according to the color-coding.

In the present invention, the leather surface 5 is protected by the permeated organic solvent 10 during the patterning and coloring.

When the mask sheet is peeled off from the leather that has been sandblasted and colored, it can be seen that a shape pattern with a clear outline is engraved on the leather.

However, as shown in FIG. 3, when the mask sheet is peeled off, the wax 4a is located between the leather surface 5 and the mask sheet 3 and remains, so the peeling can be done extremely smoothly. .

Furthermore, the mask sheet 3 does not stick to the leather surface even when the temperature rises during sandblasting, so it does not leave any stain marks after being peeled off, and it does not peel off the leather surface when it is peeled off (i.e., the shiny leather surface is obtained.

Next, by wiping the leather surface with a cloth or the like, a polished, glossy leather surface and a patterned or colored portion with raised bristles and a roughened surface can be obtained. becomes.

In the patterning method of the present invention, sandblasting is carried out so that even if the surface of the mask sheet reaches around 100°C, the oil and fat in the adhesive layer melts and dissolves, impregnating the skin from the leather surface to the mask. It protects the leather surface from the impact force of sand particles while maintaining its adhesion with the sheet, and the wax is dispersed in the form of particles in the molten oil and is sandblasted at the intermediate layer position of the adhesive layer. When the temperature rises, the wax begins to melt, and the latent heat of melting reduces the temperature rise, controls the adhesion of the mask sheet to the leather due to the temperature rise, and when it is peeled off after cooling, the wax precipitates in the form of particles, Helps remove the surface smoothly and completely.

Note that the aliphatic hydrocarbon paraffin organic solvent impregnates and permeates the raised pattern portion by capillary action, and may have the effect of preventing excessive wear and surface roughening.

Furthermore, the surface tension and adhesive force of the melt prevents the edge of the cut out contour of the mask sheet from being partially peeled off from the leather surface due to the pressure of sandblasting, giving it a clear shape contour. can be done.

In the present invention, when the pigment particles are sprayed onto the patterned area, the particles are incorporated into the raised leather, and
The pigment particles are deeply impregnated into the raised leather together with the aliphatic hydrocarbon solvent penetrating through capillary action, and when the pigment particles dissolve or swell in the aliphatic hydrocarbon solvent, the leather pattern area The coloring is durable.

The leather patterning method of the present invention can be effectively used to pattern the surface of articles made of surface-finished leather other than raw leather, such as bags, band bags, wallets, shoes, notebooks, etc.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the method for patterning the leather of the present invention, Figure 2 is an explanatory diagram showing the method for coloring the leather of the present invention, and Figure 3 is an explanatory diagram showing the method for coloring the leather of the present invention. The patterned pattern is an explanatory diagram showing the state in which the mask sheet is peeled off in the method. In the figure, 1 is a sand plastonople, 2 is a sand particle, 3 is a mask sheet, 4 is an adhesion layer, 4a is a wax, 4b is an oil/fat melting layer, 5 is a leather surface, 6 is a fluff, and 7 is a pigment sprayed layer. In the nozzle, 8 is a pigment particle, 9 is a colored pigment, and 10 is a permeated organic solvent.

Claims (1)

[Claims] 1 The surface of the leather to be patterned is heated and impregnated with oils and fats containing wax, and after cooling, an adhesive sandblasting mask sheet is adhered, and particulate abrasive material is sprayed on top of it. The mask is applied to create a pattern on a part of the leather surface, and then, if necessary, one or more types of particulate pigments are blown to create a monochromatic or multicolored color, and the mask is peeled off. The patterning of the leather is characterized by a method.