JPS58502111A - Screen printing method and typesetting for screen printing used therein - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Screen printing method and screen print 4 version used therein The present invention A screen whose printing form is manufactured using photopolymerizable materials. Regarding lean printing method.

Othmar Zeman Look (Der 5iebdruck)'', Volume 27, January 1981, No. The paper on page 24 ff fully describes the production of photosensitive screen material and in particular 1 shows a method for obtaining a thick layer of light-sensitive material so that it can be used to produce large prints.

For chromate- or diazo-sensitive materials, an impregnated screen is added to the screen. A further layer can be layered on top of the level with a thickness of up to α3■. Even thicker <(0.3~2 gourd) Liquid photopolymerizable materials are used when it is necessary to and at the same time it adheres to the screen material, i.e. it is a gauze or fabric. Fixed inside something.

The above two methods are very cumbersome, require great skill to perform correctly, and An inherent drawback is that the relatively expensive screen can only be used once.

Dutch Patent Application No. 7607224 describes a screen-printed Braille The production of a conventional screen printing format, i.e., the thickness typesetting was used, and stamp inks containing swelling agents were never used. Ru. The commonly used printed pattern or adhered tabs are then expanded by heat treatment. It will be done. This method allows precise control over the degree of swelling, i.e. the thickness of the printed pattern. However, its implementation requires a large amount of energy, and many materials cannot withstand the high temperatures of heat treatment. It has the disadvantage of not being resistant to f (180°C). Furthermore, due to the formation of bubbles, dry marks The surface of the printed pattern is not smooth and is rather difficult to read.

The object of the present invention is to avoid all the above and other drawbacks and disadvantages of screen printing It is about presenting and sharing the law. For this purpose, the present invention provides that the screen printing typesetting is In a screen printing method in which a polymeric material is used, the photopolymerizable material is in the form of a sheet that is firmly fixed to the screen before or after exposure and development. used, and the thickness of the sheet, the nature of the sheet and the nature of the printing ink , the resulting printed pattern has a maximum thickness after drying of at least 0.25+++ m Provided is a screen printing method characterized in that the screen printing method is selected such that: Photopolymerizable silicone The sheet material is very easily pressed onto the screen or the liquid photopolymerizable material. is contaminated and attached to the original screen, while expensive screens are easily and Can be completely removed for reuse. Furthermore, the thickness of the stamp pattern can be precisely controlled. , a large amount of energy and high temperature are required for drying, and dry bed mark 161] Putter Vim consists of a hard, undeformable material with an erect surface.

A photopolymerizable material that is rigid at normal temperatures and can be supplied in the form of a flexible sheet is It is publicly known. This kind of futuristic material is nylon which is 4-decomposable in water, dilute acids or alcohols. It is a uniformly photosensitive composition. Such photosensitive resin compositions include, for example, essential components as polymers containing basic nitrogen atoms in the main chain or side chains, photopolymerizable unsaturated monomers, mer, and photosensitizer. For more information about such photosensitive compositions Reference is made to U.S. Pat. No. 4,145,222 in its entirety.

The photopolymerizable sheet material used in accordance with the present invention is about 0.2 to about 1 ．． 2■ various thicknesses, Toyobo-7' IJ 7 tie) (Toyobo Printight) (Toyobo) and Miraku o y (iVlira) cl:on) and Rigilon (manufactured by Tokyo Yokoono) It is commercially available under the trade name. A protective removable cover foil is provided on one side. The photopolymerizable sheet has an anti-halation effect (ψ11) of the pond. Polyester or gold backing with adhesive layer that can also have firmly connected to the material. Connection with this solid backing material is important. Why? This is because the material is intended for the manufacture of printing plates, especially relief printing plates. Ru.

In the eyes of the uninvented, the fixed fc in the above-mentioned commercial products may be temporary or It is sufficient if it is configured as a detachable type, and this can be easily done by omitting the adhesive. can be achieved. According to the invention, the photopolymerization layer has a thickness of 0.2 to 0.7 mm. It is preferable to use the entire sex sheet, and in terms of -8β, this is a comparatively Gives the best results when using the groaning stamp pattern. −Selected as a definite case; The thickness of the printed material is determined in part by the nature of the printed pattern and especially its thickness. However, it also depends on the thickness of the screen gauze. In fact, 1 la Thin gauze with a large number of threads per inning can be made using the same stamping ink. To produce a printed pattern of the same thickness in kW, relatively few threads per running meter are required. must be combined with a thicker photopolymerizable sheet than in the case of thick gauze containing.

Various procedures are possible for producing screen printing forms according to the invention. 1st According to the method of It is removed and the photopolymerizable sheet is exposed throughout the positive original. UV range Any 5Y source (point source or tube lamp) suitable for full radiation exposure can be used for exposure. For example, high or low pressure mercury vapor lamps, metal halide lamps, xenon lamps, or carbon atom lamps. Park lights can be used. Care should be taken that this exposure is not too bright and 〃・Even if it is, it should be less than t necessary for complete photopolymerization. child The photopolymerizable sheet was then bonded to the screen. Sufficient adhesion: a, and also the unavoidable scattering effect outside the exposed area at the end. In this way, the entire area exposed to scattering can be washed out during the development stage; It is important to Exposures that give optimal results for a particular case are easily determined by a person skilled in the art. Decide on the light source to be used, select all appropriate light sources, and set the exposure distance and exposure time. It is easier to control 1 lil than you know how to adjust it.

After exposure, typesetting is done in an efficient manner using a powerful hot water slurry. The temperature of the water is preferably at least 50°C, more preferably The temperature is 60-80°C. Treat the entire surface of the sheet with a water jet as evenly as possible. It is important to ensure complete development.

Generally speaking, the development process will depend on the conditions, but for sheets that are divided into about 3 to 15 parts, press the next button. Press it against the screen thread to firmly adhere it. This operation can be performed, for example, using a vacuum It can be done in Ramen. Dry the covered screen, e.g. on a drying rack or about 3 Dry using a hot air stream from 0 to 60 °C, and late dry using UV St as previously described. Exposure to light completes photopolymerization or hardens the photopolymerizable material. Finally, Makizan Existing backing material or cover foil fI: Once removed, the screen printing typeface is unusable. It will be ready for use.

According to a second typesetting method for screen printing, a liquid form is first applied to the screen. A photopolymerizable material such as that commercially available from Toyobo Co., Ltd. mentioned above is incorporated. after that, The thus pretreated screen is then processed using, for example, a squeegee. Press it onto the blank surface of the photopolymerizable sheet.

The other side of the sheet is covered with a removable backing material or cover foil as described above. We are prepared. The obtained laminate is heated for several minutes, for example, 20 to 40 minutes. Dry at a relatively low temperature, preferably below 25°C to form a solid layer, and then Strip off any remaining flaming material or bar foil and expose the photopolymerizable sheet. the process of preparing the screen printing form used in the present invention. 1, and subjected to a later exposure in the manner discussed in more detail above in connection with method 1.

A large number of screen materials can be used to screen print an X-face, for example Particularly suitable for nylon, polyester, metal coated polyester 2 and steel ρ1 ash Can be used. The screen contains a small number of threads per running wound and not too many threads. That's important. (1 run, 1 foil) If less than 15 threads are used, especially photopolymerized materials 2) Insert the developed Motonami Aie sheet firmly into the non-existent area. (Generally not enough to use) - If there are more than 3 hours per run, the use Its permeability to printing inks can be determined by passing it once or two or three times through a pressurizer. It is not so secluded that you can completely fill the screen with printing ink. Preferably 1 Running #) Use a screen containing 24Z to 51 yarn.

For printing, a screen ζ that can be used for the first mark, its covered surface or relief Rearrange it so that the side faces the mark, mJ, and the item, and then attach the dot to the item. I can stand tall. Konya, known as Yamihara, is a screen printing typesetting company that uses The printing ink, the thickness of the printed pattern and the desired thickness, the 2L printed article It changes according to category 1. Usually the gap is about 2 to 6 tones. The printing operation itself can be carried out in a manner customary for screen printing methods. In other words, printing ink is Apply cleanly, then press through the entire screen or heel print. Deposit (e.g. rubber or synthetic glass material) onto the article using a depressor let

As previously mentioned, the present invention provides a relatively thick printed pattern, i.e. the maximum thickness of the individual protrusions. I expect it to be at least 25 degrees and rotten after it dries. As a result, The thickness of the photopolymerizable sheet is determined by the properties of the screen and the thickness of the bamboo gauze. As I said, she is a masochist concubine. A more important item is the properties of the printing ink. practical problems and As such, it has a high solids content and, at best, very little secondary stream. It is only permissible to indicate that The solids content of the printing ink used is preferably low. At least 80 wounds. A suitable mark for this type, $U ink, is an IR curable ink. Are known. Those suitable for use according to the present invention have a natural solid content. Example: 100% b, then mark, 0ill sickle immediately g, for a short period of time, for example 10 seconds or 1 It can be dried by U4-irradiation for a minute, resulting in a secondary flow of 2 yohi seals. UV-curable printing ink with minimal height loss (also well-cured) )Deril. The best printing ink has medium-quick drying or quick-curing properties, which can be achieved by using UV light. On the basis of polymerization, the principle and countless examples are also Since it is built in the shape of a wild boar, there is no need to discuss it in more detail here. UV-curing For example, in the United States, the part name SoLex is used for printing ink. Cart, by Advance-excello It is commercially available.

Wood screen printing method is used for Braille printing, decorative relief printing and electronics purposes. It can be applied to many things such as printing. Can be printed depending on national purpose A wide variety of flat materials such as paper, synthetic plastic materials, metals, and textiles , glass, ceramic, etc., and may also be printed with e.g. colorants, pigments, electrical Compatible with all kinds of auxiliaries such as conductive and insulating materials, magnetizable particles, etc. can be added to printing inks to The method of the present invention can be used, for example, in Braille markings. When used for printing, it facilitates color recognition for people who still have some vision. It can be helpful to print in color to give. 47 to classic by the present invention Unlike conventional Braille, the material does not deform, so Braille can be printed on both sides of the paper. Can be done.

If you don't need to make a seal, please use the screen for philanthropy. It can be easily removed from the overlying cell material. For this purpose, the screen Lean Mark 7 can be processed. Suitable solvents include methanol, bleach water, and optically concentrated Examples of f'-treated formic acid include vinegar, or a combination of these. Due to the action of the solvent The photopolymerizable material begins to swell and soften, making the barley screen e.g. It can withstand high pressure and high quality equipment to compete in the air. Next, use the screen as an example. It can be degreased with soda solution or similar means, and then dried and Ryōji's screen can be used to perform the Inko] cycle.

The present invention will be explained in detail with reference to the following examples.

Example 1: One starting point for providing photopolymerizable materials in sheet form or in layers is Toyobo. -Printite (Toyob.

Printight) type EF-70. Tiz A3 (manufactured by Toyobo Co., Ltd., Japan'X) This is made of a 0.55m thick washable l Mitsuda composite layer and its polyester backing. Chitoma's butt halation receiving lever (7) Wi i': l near 5 sho r + Ji 80ax C1 distance 41C60, 220VX 16.7KW carbon arc Place the positive braille original J'Ji on the screen printing vacuum line using clamp metal scraps. The exposure was shortened in the mode (c).

Next is the material? , spray the exposed layer uniformly from the VC, then spray for 10 minutes. Each sample was treated with hot water at a temperature of 60 to 80°C. Too much water Carefully remove the surface using a dry cloth, then the surface is very sticky and the surface will be exposed to the developer. A soft developing layer is made of polyester fiber having a thread length of 40'x per run. Clean the screen Eq-J 307 frame covered with a mask, and then clean it for 5 minutes. OL in the lean printing tool copy frame, <suction (lwa vs. true 90mm) It was pressed firmly against the screen thread. Then let it dry in the application tool for 20 minutes. dried and then allowed to stand under the same conditions as above using a carbon arc lamp for a further 5 minutes. A late exposure was performed to complete photopolymerization without master and vacuum. lastly The polyester backing is removed and the screen printing type is ready for use. It was intended.

Then for screen printing, place the typeface with the coated side facing down and place it on the paper to be printed. It was turned into a screen printing machine leaving a gap of 4 mm between it and the sheet. Mark 8 1J is 5olex HUG-UV-9119 at a ratio of 75/25 UB 9050 midtone standard color (both USA, Chicago, Advanced using a UV-curable printing ink prepared by mixing with It was carried out using The printing ink is applied to the screen printing typeface, and The material is pressed through the mesh and printed by means of a transfer press on the synthetic plastic material. layered on a sheet of paper.

After this, to completely cure the printed pattern immediately, remove the printed sheet 3 times. A 700W high-pressure mercury vapor lamp (Philips (Ph1li) ps type HPL) for 30 seconds. In this way, the skin thickness is 0.3 A hemispherical harpoon with glue that is smooth, non-compressive, and does not deform into other shapes. The symbol 71. Ta.

200 prints of excellent quality using the above method and screen printing typesetting Removed the ink from January et al. All materials that are immersed in a methanol bath for a minute and then button still on the screen printing formwork The material was removed using a high pressure water jet. The formwork is then treated with an oval and degreaser. , and then prepared for reuse.

Example II: Screen printing formwork covered with the same polyester gauze as described in Example ■ Toyobo (Toyobo) 'Liquid Hikari'1 synthetic material made by Shishiki Company was applied completely, and then Then, as already described in column I, attach the cover foil for the modification plate. The removed photopolymerizable layer is melted and then finally compressed by means of an intensifier. C8 This unobtained laminate was dried for 22 minutes at 25°C for 30 minutes, and then The ester-lined sea was removed.

The photopolymerizable layer present on the formwork and very firmly bonded to the formwork is then exposed. Light, develop, dry, and perform a late exposure as described in Example I, but in this case Depending on the desired degree of photopolymerization and the desired limits on scattering and axial radiation, the The duration is 75 seconds, but the duration is selected between 90 and 150 seconds.

Printing was done exactly as described in Example 1 using the same stamp and control ink. I get a similar print result with the statement.

Temporarily, the screen printing formwork can be reused using the same method as described in Example 1. Wash fC for use.

international search report

Claims (1)

[Claims] 1. Screen printing formats are manufactured using photopolymerizable materials. In the Ninbata 11 method, the photopolymerizable material is J! Original and screen before or after development used in the form of a sheet that is rigidly fixed to the lean, and the thickness of the sheet, The properties of the sheet and the properties of the printing ink are such that the resulting printed pattern is All features of the screen are selected to have a maximum thickness of at least α25■. printing method. 2 Claim characterized in that a photopolymerizable sheet with a thickness of α2 to α7■ is used. The screen printing method according to item 1. 1 Nylon type photopolymerizable sheet soluble in water, dilute acid or alcohol The screen printing method according to claim 1, characterized in that a flexible material is used. 4. exposing the photopolymerizable sheet to less light than necessary to effect complete photopolymerization; Subsequently, development is carried out in water at a temperature of at least 50°C, preferably 60-80°C. The screen printing method according to claim 3, wherein the screen printing method is characterized by: &　Exposed and developed photopolymerizable sheet subjected to late exposure on the whole screen The screen mark according to claim 4, characterized in that the photopolymerization is completed by Printing method. Textile structure: 15 to 73 yarns/running yarn, preferably 24 to 51 yarns /Using the screen for running pictures The screen printing method described in item 1. 7. Uses No-Inlid printing ink that can be cured by UV irradiation. The screen mark @11 method according to claim 1, which is characterized in that it is performed by: & After use, all substances on the screen must be completely removed in order to reuse the entire screen. The screen printing method according to claim 1, characterized in that: 9. Can be used for Braille printing, decorative relief printing, or electronics markings. A screen printing method according to claim 1, characterized in that: 10. A screen used for carrying out the screen printing method according to claim 1 Typesetting for clean printing.