JPS58114859A - Carving method by sand blast processing - Google Patents

Abstract

PURPOSE:To enable carving having a colorful variation, by so constituting that a pattern of a block copy painted by making use of colors other than black and white is carvable on a material to be processed by sand blast processing over exact display of a difference of lightness of the colors. CONSTITUTION:A flowery pattern with trimming painted on a block copy 1 is painted separately in white parts 2, black parts 3 and medium lightness parts 4, in sand blast processing which is carried out by applying a masking sheet fabricated by making use of photosensitive resin to a work. A photograph of lightness of the block copy 1 is taken in a dissolved dot formation, through which a halftone negative film of a dotted screen is made and then the masking sheet is fabricated by removing an unexposed photosensitive resin through this film. Then, the sand blast processing is carried out by applying the masking sheet to a material to be processed. Carving having a colorful variation can be done in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves attaching a masking sheet made using a photosensitive resin to a workpiece, performing sand-shirast processing, and scraping off the portions not protected by the masking sheet to remove the material from the workpiece. Concerning the method of engraving.

Conventionally, characters, symbols, patterns, etc. (hereinafter referred to as "patterns, etc.") are drawn on the black and white blocks using a photoengraving method using a film and a photosensitive resin. A masking sheet having a shape of a pattern, etc., or a masking sheet having a through hole in the shape of a pattern, etc. drawn on the above-mentioned block is created, and this is attached to the workpiece and sandblasting is performed. It is.・In this way, in the areas covered by the masking sort, the abrasive material is bounced off by the elasticity of the masking sheet and the workpiece is protected, while the areas not protected by the masking sheet are scraped off by the collision of the abrasive materials, and the plate The same pattern as the one drawn below will be carved into the workpiece.

However, in the above conventional method, the white part or black part of the block is directly expressed on the workpiece as either an engraving or an embossed part, so in the block, the pattern is created by painting two colors, white and black. In addition, the engraving process is clearly divided into the shape part and the embossed part using these two colors, and there is a drawback that the range of expression is narrow because there are only two means of expression. . That is, in the conventional method, blurred patterns and shading are used.

Furthermore, it is the skill of color printing that accurately expresses the shading of colors in each part of a pattern, etc.

In particular, sculpture generally aims to express objects of various shapes three-dimensionally, and is completely different from paintings, etc., which express objects through changes in color. The reality is that expressing sensations has not even been considered in the past.

The present invention makes it possible to engrave patterns on a workpiece drawn using colors other than white and black onto a workpiece while accurately expressing the difference in lightness of the colors, thereby creating a wide variety of changes. The purpose is to make it possible to carry out carving.

That is, the present invention creates a block copy in which characters, symbols, patterns, etc. are drawn using only a color other than white and black, or a combination of white and black, or both or one of them.
Halftone dots are formed as solid parts or through-holes by photolithography using a film and photosensitive resin that are photographed by dividing the brightness of characters, symbols, patterns, etc. drawn on this block. A masking sheet is created that partitions part or all of characters, symbols, patterns, etc. by a collection of be.

Here, in this specification, film means both negative film and positive film, and photosensitive resin refers to negative photosensitive resin that causes a curing (polymerization) reaction when irradiated with light, and This refers to both of the photosensitive resins that undergo a decomposition reaction.

Hereinafter, the present invention will be described in more detail with reference to the drawings, taking as an example the case where the most common negative film and negative photosensitive resin are used.

FIG. 1 is a plan view of the block, FIG. 2 is an explanatory diagram of the procedure, and FIG. 3 is a plan view of the engraved workpiece.

First, in the method of the present invention, a block 1 is created in which a pattern or the like is drawn using only a color other than white and black, or a color that includes both or one of white and black. That is, intermediate lightness colors are included in the depiction of patterns and the like. The bordered flower pattern drawn on the block copy 1 shown in FIG. 1 is divided into a white part 2, a black part 3, and an intermediate lightness color part 4. In Figure 1, the intermediate brightness color area 4
The density of the checkered stripes indicates the brightness and darkness of intermediate brightness colors.

As shown in FIG. 2(a), the above-mentioned printing block 1 is photographed by dividing its brightness into halftone dots, thereby producing a film 5 with halftone dots. Next, as shown in (b), the negative photosensitive resin 7 is exposed to light through the film 5 by the light source B, and the unexposed portions of the negative photosensitive resin 7 are removed to form a masking sheet. Create 8. 9 is a support sheet for receiving the negative photosensitive resin 7 and holding the masking sheet 8 in a certain shape; 10 is a thin auxiliary film for facilitating the peeling of the support sheet 9 after the masking sheet 8 is formed; be.

The masking sheet 8 created in this way is (C
), the net is a set of point-like solid parts, which correspond to the transparent part 8a corresponding to the white part 2, the solid part 8b corresponding to the black part, and the intermediate brightness color part 4 of the block 1. It is a strip having a dotted portion 8c. In particular, the halftone area 8c is the intermediate lightness color area 4.
The surface density of the point-like entity changes depending on the difference in brightness. This can be easily understood from general photolithography technology.

As shown in (a), the masking sheet 8, in which the pattern of the block 1 is divided by the through-hole portion 8a, the substance M8b, and the halftone dot portion 8c, is applied to the workpiece with an adhesive or the like, as shown in (a). 11, and after peeling off the support sheet 9, it is subjected to sandblasting as shown in (d). When sandblasting is performed, the auxiliary film falls off, the exposed portion of the workpiece 11 that is not covered by the masking sheet 8 is scraped off by the abrasive, and the surface of the workpiece 11 covered by the masking sheet 8 is Since the abrasive material is repelled by the elasticity of the masking sheet 8, it maintains its original shape.

After sandblasting for a certain period of time in this way,
A workpiece 11 is engraved along the pattern defined on the masking sheet 8. That is, the substantial portion 8a of the masking sheet 8 serves as the raised portion 11a, and the through hole portion 8b serves as the shaped portion 11.
b, and the halftone dot part 8c is a collection part 1 of fine dot-like protrusions.
1C on the workpiece 11. In particular, this point-like projection gathering part 11c is an intermediate expression part between the embossed part 11a and the shape part 11b, and the density of the dot-like projections changes depending on the brightness of the intermediate brightness color part 4 of the block copy 1. Because it is a thing, it can be expressed in an extremely wide variety of ways.

When the masking sheet 8 is peeled off after engraving in this way, the workpiece 11 has an embossed part 11a shown in outline in the figure and a shaped part 11b shown in diagonal lines as shown in FIG. The flower pattern with a border is expressed by the clustered portions 11c of dotted projections, which are interesting. Incidentally, the density of the dots representing the cluster 11C of dot-like protrusions in FIG. 1 represents the density of the dot-like protrusions.

In Method G of the present invention, any intermediate brightness color used to create the printing plate can be used as long as it is not white or black. However, when engraving, what is expressed as a collection of point-like protrusions is a difference in the lightness of the intermediate lightness color, so in order to accurately understand this difference in lightness when creating the block, only uncoloring is used. It is preferable to use This is because, in the case of chromatic colors, it may be difficult to distinguish the brightness of different colors.Also, ordinary photographs, paintings, printed materials, etc. can be used as bases without any special masters. It also has the advantage of being able to.

A block copy is photographed by dividing its brightness into halftone dots, but if the halftone dots are formed as transparent holes in a masking sheet, the diameter and the halftone dots are formed as a real part of the masking sheet. In that case, it is preferable to set the interval between the halftone dots to be at least three times the average particle diameter of the sandblasting abrasive. This is because if the distance between the halftone dots that are transparent holes or the halftone dots that are solid parts is too small, it will be difficult for the sandblasting abrasive to pass through those areas, and the fine irregularities caused by the halftone dots will be applied to the workpiece. It becomes difficult to form. However, by intentionally forming the halftone dots in a way that is difficult for the sandblasting abrasive to pass through, the unevenness and blurring of the fine irregularities that result from this can be used as a means of engraving expression. In order to form halftone dots through which the sandblasting abrasive material can easily pass, a relatively bright color should be selected as the intermediate brightness color for the combination of negative film and negative photosensitive resin and for the combination of positive film and positive photosensitive resin. Or, it is better to photograph the block copy in a highlighted state than in the normal case, or vice versa when using a combination of negative film and a photosensitive resin, or a combination of a positive film and a negative photosensitive resin. good.

Usually one halftone dot is 65 lines or less, and the surface density of halftone dots is 15 to 80.
In the case of sandblasting, each halftone dot can be clearly expressed by sandblasting. However, even if the number of halftone dots and the surface density of the halftone dots are outside this range, it is possible to express the halftone dots clearly by one minute depending on the abrasive grains used for sandblasting and the material of the workpiece.

The material to be processed in the present invention may be any material as long as it can be shaved by glass/doblasting, and specifically includes glass products, wood, bamboo materials, ceramics, metal products, leather, synthetic resin products, etc. It can be used extremely widely.

It is also possible to apply weight to the curved surface of the workpiece.

The above example was explained using a combination of a negative film and a negative type photosensitive resin, but it is exactly the same even if it is performed using a combination of a Bottled film and a Bottled photosensitive resin. If a combination or a combination of Bottfilm and a negative photosensitive resin is used, the unevenness of the engraving applied to the workpiece will be completely opposite to that described above. However, to use Bott film, it takes time and effort to transfer from a negative film to create a positive film, and Bottd type photosensitive resin is not common, so a combination of negative film and negative photosensitive resin is optimal.

Furthermore, to explain another aspect of the present invention, if the printing plate is created only in intermediate lightness colors, it is possible to engrave the workpiece with only fine dot-like irregularities. In this case as well, since the density of the dot-like irregularities changes according to the brightness of each part of the pattern drawn on the block, an interesting stipple-like engraving as shown in FIG. 4 can be obtained. It is also preferable to color the shaped portion of the workpiece after engraving by sandblasting. This coloring can be done by spraying paint with the masking sheet attached after sandblasting, or by embedding powdered minerals into the shape, especially when the workpiece is made of heat-resistant material such as glass.
This can also be sintered.

In particular, the apparent volume of powdered pigments that are melted by heat is approximately 2/15 to 415, usually 2/6.
This is the real volume before and after. Therefore, as shown in No. 5-1 pta, the engraving depth of the workpiece 11 is determined appropriately, and the powdered pigment 12 is applied to the shape with the masking sheet 8 attached.
If the colored layer 15 formed after sintering is filled and sintered, as shown in FIG.
It can be formed flat with respect to the above. That is, the thickness of the masking sheet 8 can be utilized to fill the shaped portion with as much powdered pigment 12 as the volume will be reduced during sintering.

When this filling and sintering of the powdered pigment 12 is used to express a pattern, etc. only by halftone dots formed as shapes on the workpiece, the colored layer 13 to be formed and the workpiece 11 are integrated. It has the advantage that the force is extremely strong and the colored wax 13 does not easily peel off. Depending on the density of the dot-shaped portions, which are halftone dots, even if the coloring is one color, the pattern is divided into a printed portion and a light portion to display a pattern.

Furthermore, the engraving method according to the present invention is not limited to simply carving obvious irregularities on a workpiece to form a pattern, etc., but also applying the engraving method of the present invention using a see-through glass plate as a workpiece, and applying the engraving method to a sandblasting abrasive material. This also includes cases where the unevenness of the workpiece is not apparent from the outside, such as cases where a pattern or the like is added by clouding a part of the workpiece due to a collision.

Example A block copy of a flower pattern with a border similar to that shown in Figure 1 was created using three colors: white, black, and gray with a lightness intermediate between white and black, and the lightness of this was determined by halftone dots. Negative film taken after disassembly and APR [
A masking sheet was prepared by an ordinary photolithography method using ASA200 model (registered trademark of Asahi Kasei Industries, Ltd.). This masking sheet was attached to the side surface of a ceramic cup with an adhesive, and this attached surface was sandblasted for 5 minutes using silicon carbide as an abrasive while changing the abrasive position evenly by hand. The obtained carved product had a carving process similar to that shown in FIG. 6, which had a sense of shading and excellent Q-shape properties. Incidentally, the su/doblast processing area was 25M.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an example of a block plate used in the present invention;
The figure is a detailed explanatory diagram of the present invention, Figures 3 (a) to (f) are plan views of the workpiece that has been carved based on the block diagram in Figure 1, and Figure 4 is another machining state. 5th plan view of the added F pattern showing
Figures (a) and (b) are explanatory views of sintering and coloring using bee-like pigments. Applicant Asahi Kasei Kogyo Co., Ltd. Agent Yutaka 1) Yoshio Figure 1/- Figure 2 ¥ = Continued Amendment (Method) May 19, 1980 Patent Section Chief 'Jijima' 1) Haruki Tono 1, Case Display patent application 1984-. 20954'0 No. 2 Name of the invention Engraving method by sandblasting 6, Person making the amendment Relationship with the case Special applicant German No. 6, Dojihama 1-2, Kita-ku, Osaka, Osaka Prefecture (003) Asahi Kasei Co., Ltd. Representative Director and President: Teru Saki 4, Representative: Room 204, 1-31g Building, 1-4, Yurakucho, Chiyoda-ku, Tokyo Telephone: 50) 21385 Date of suspension order: April 27, 1980 (shipment date) 6. Amendment The burning elephant 1 power, the cutting H-υ1 to IW)'s l1il 皐Na Senmei j's piece Z
Same number on sleeve clasp 1) Specification, 14H, line 7 [2nd shij (iJ is deleted to "Fig. 2 (a-ge) wa"). 2 no.
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Claims (1)

[Claims] 1) Creating a block copy in which characters, symbols, patterns, etc. are drawn using only a color other than white and black, or a color that includes both or one of white and black. And the characters drawn on this block. The brightness of symbols, patterns, etc. can be changed by photolithography using film and photosensitive resin, which are photographed by dividing the halftone dots.
An engraving method by sandblasting, which is characterized by creating a masking sheet that partitions part or all of a pattern, etc., attaching this masking sheet to a workpiece, and performing sandblasting.