RU2051044C1 - Method for producing images on articles - Google Patents

Abstract

FIELD: marking of abrasive products. SUBSTANCE: backing is coated with a layer of paint with a thermostable pigment. Then an image is applied. Next, the backing with the applied image is brought in contact with the product and the latter is heat-treated. EFFECT: higher efficiency.

Description

 The invention relates to methods for obtaining images on the surface of heat-resistant products, in particular to methods for marking abrasive products on a bakelite bond.

A known method of obtaining images on the surface of heat-resistant products, in particular on the surface of porcelain products [1]
The method involves applying colorful images directly to the surface of the product and subsequent firing of the product. Sections of one color (for example, black) are applied to areas of a larger area of a different color (for example, gold), while paints are chosen such that the melting and solidification temperature of the lower paint is lower than the melting and solidification temperature of the upper paint. Due to this, the firing of all paints is carried out in one process, while melting the lower paint at a lower temperature provides a stable base for paints applied on top.

 However, this method is very time-consuming, since it involves layering a paint coating directly on the product. In addition, the method uses specially selected paints with different temperature parameters, which complicates and increases the cost of the process of obtaining images.

A known method of obtaining images on the surface of heat-resistant plastic, glass, porcelain, earthenware, pottery, wooden products [2]
The color image is sealed with ink capable of sublimation on a transfer material, which is then glued to the product. The top layer of the transfer material is coated with a synthetic resin film. Then the product is subjected to heat treatment, as a result, the paint sublimates and penetrates into the specified film, forming an image on the surface of the product.

 This method is more productive, since the image is not applied to the product, but is pre-printed on the translated material.

 However, this method is expensive due to the use of special paints that can sublimate. The need for applying a film of synthetic resin and drying it before heat treatment of the product increases the duration of the process.

 In addition, the method does not allow to obtain a clear image on abrasive products, since it is impossible to ensure tight and reliable contact of the film of resin into which the paint is sublimated, with the uneven and rough surface of the abrasive products.

A known method of obtaining images on thermoplastic products, which is selected by the authors for the prototype [3]
The method consists in the fact that an image is printed on a substrate by a printing method, for example, offset, the substrate is contacted with a thermoplastic product, followed by heat treatment of the product, after which the substrate is connected to the surface of the product.

 This method allows you to efficiently and efficiently obtain images on products, but it has the following disadvantage: the method does not allow you to apply images to products that during the heat treatment emit substances that affect the color of paints.

 The proposed method solves the problem of increasing labor productivity and reducing the cost of the process and allows you to apply images to products that during the heat treatment emit substances that affect the color of paints and substrates.

 The specified technical result is achieved in that the method includes printing the image on the substrate by printing, contacting the substrate with the printed image with the product and subsequent heat treatment of the product, while before applying the image, the substrate is additionally covered with a layer of paint with heat-resistant pigment.

 The use of a high-performance and cheap printing method for applying an image to a substrate makes it possible to simplify and reduce the cost of the image acquisition method. In this case, ordinary inexpensive printing inks are used. In addition, the printing method allows you to apply a colorful image in a thin layer (1-2 microns), in contrast, for example, from the screen method, where the thickness of the ink layer is 10-80 microns. This reduces paint consumption and further reduces the cost of the method. With the printing method for applying a colorful image, one ink layer can be applied to the previous ink layer without first drying the applied layers, which reduces the duration of the process.

 As the substrate using paper or woven material.

 However, in the case of applying the image by printing directly to the surface of the substrate, printing inks change their color during the subsequent heat treatment of the product. During heat treatment of an abrasive tool with a bakelite bond, inks pre-applied to the substrate change color due to the chemical effect of the phenolic compounds that make up the product on the organic components of the inks.

 Applying a paint layer with a heat-resistant pigment (for example, a layer of silver, bronze or other paint before printing a colorful image on a substrate) onto the substrate ensures that the colors of the resulting image are preserved during the subsequent heat treatment of the product. The paint layer with heat-resistant pigment withstands the required heat treatment temperature and at the same time protects the image applied to the specified layer from the chemical effects of phenolic compounds.

 The application of a layer of paint with heat-resistant pigment is carried out either on the entire surface of the substrate, or in areas on which a colorful image is then applied. In this case, the areas covered only with a paint layer with heat-resistant pigment also participate in the formation of the resulting image, being either a decorative background or an image element. After the heat treatment of the product is completed, the substrate with the image deposited on it appears to be firmly bound to the surface of the abrasive product. If necessary, the surface of the substrate is pre-tinted in the desired color, depending on the desired decorative design of the product.

 PRI me R 1.

Carried out the marking image on a cutting wheel on a bakelite bunch according to the proposed method. A black tinted layer of silver ink was applied on a substrate of brand A newsprint, tinted in black, to the areas on which the required marking image was then formed. A color marking image was applied to the wet layer of silver ink by offset printing method with 2416 series inks. The substrate was contacted with the image applied to it with a bakelite mixture prepared to form a cutting wheel by applying it to the specified mass. Compression molded cutting wheel. The obtained blank of a circle with a substrate superimposed on it with an image was placed in a bakelizer. Heat treating the molded article was performed in bakelizatore while the temperature was varied from 18 to 220 ^{° C} for 29 hours in accordance with process regulations bakelizatsii.

 After completion of the heat treatment process, a cutting wheel was obtained with a marking deposited on its surface. The paints that participated in the formation of the image did not change their color, the image turned out to be clearly expressed. The substrate after heat treatment turned out to be tightly and reliably connected to the surface of the product. In this case, the substrate remained black and represented a black decorative background for the resulting image.

 PRI me R 2.

Marked cutting wheel on a bakelite bunch according to the proposed method. Silver ink was applied on a paper backing from white brand A newsprint paper. Then, a color marking image with 2416 series inks was applied to the silver ink in an offset way, while part of the silver ink layer remained unsealed with the printing inks. The substrate was applied to a bakelite mixture intended for forming a cutting wheel. Compression molded cutting wheel. The obtained preform was placed in a bakelizer, where the product was heat treated. The heat treatment temperature was changed from 18 to 220 ^{° C} for 29 hours in accordance with process regulations bakelizatsii.

 At the end of the heat treatment, a cutting wheel was obtained with a clearly marked marking applied to its surface. The paints involved in the image formation did not change their color. Silver paint also participated in the formation of the image as an image element. After heat treatment, the substrate acquired a brownish-golden color, which represented a beautiful decorative background for the resulting image.

 PRI me R 3.

 Marked cutting wheel on a bakelite bunch according to the proposed method.

A bronze ink was applied by offset to a paper substrate of 100% sulfate cellulose, which was painted black during manufacture, in areas where a color marking image was then formed. Then, on a bronze ink (without drying it), a color marking image was applied by offset printing inks of the 2416 series. The substrate was applied to a bakelite mixture, a cutting circle was molded by compression, the resulting workpiece was placed in a bakelizer, where the product was heat treated. The heat treatment temperature was changed from 18 to 240 ^{° C} for 29 hours in accordance with process regulations bakelizatsii.

 After the end of the heat treatment, a cutting wheel was obtained with a clearly marked marking applied to its surface. The paints involved in the image formation did not change their color. After heat treatment, the substrate did not change its color and was a black decorative background for the resulting image.

 Thus, the proposed method allows to obtain a clearly defined image on the surface of abrasive products while maintaining the color of the used paints. The product acquires a beautiful decorative look. The method is simple and economical.

Claims (1)

 METHOD FOR PRODUCING IMAGES ON PRODUCTS, mainly heat-resistant, including printing the image on the substrate by printing, contacting the substrate with the printed image on the product and subsequent heat treatment of the product, characterized in that before applying the image the substrate is additionally covered with a layer of paint with heat-resistant pigment.