JP4873271B2 - Stencil paper for thermal head-sensitive screen printing, and plate making method using the stencil paper - Google Patents

Description

  The present invention can melt and punch a perforated image of a desired character, figure, pattern, or the like by heat generated by heating a thermal head to a dot matrix, and can use either water-based ink or oil-based ink. The present invention relates to a thermal head heat-sensitive screen printing stencil sheet obtained by laminating a thermoplastic synthetic resin film and a screen printing casing, and a plate making method using the stencil sheet.

  The present inventor has developed a thermal head for thermal screen printing in which a polyester film having a thickness of 1.5 to 2 μm and a screen printing casing are bonded to each other with an adhesive containing an amine-containing unsaturated polyester resin and a polyisocyanate resin as a curing agent. Stencil paper (Patent Document 1) is commercialized.

Japanese Patent No. 2946030

  The thermal head heat-sensitive screen printing stencil sheet uses a polyester film having a thickness of 1.5 to 2 μm, so that a silk screen printing stencil sheet can be produced efficiently and inexpensively. The printing durability is limited to about 100 sheets, and there is a problem that the number of printed sheets becomes extremely small when the stencil sheet for silk screen printing is strongly stretched.

  In view of the above problems, the present inventor forms a perforated image by a thermal method that can easily form an image on a heat-sensitive screen printing stencil sheet even when a polyester film having a thickness of 2 μm or more is used. It is technical to provide a thermal head heat-sensitive screen printing stencil sheet (hereinafter also simply referred to as “stencil sheet”) that can be printed using oil-based inks, has excellent printing durability, and can be used repeatedly. Research and experiment were repeated as a subject.

  As a result, the adhesive for bonding the thermoplastic synthetic resin film and the screen printing casing is composed of a main agent containing polyurethane, a curing agent containing tolylene diisocyanate and a urethane resin, and the solid content of the main agent is 100. Using a two-pack adhesive in which a curing agent is blended at a ratio of 110 to 160 parts by weight in terms of solid content with respect to parts by weight, and immersing a screen printing casing in the adhesive bath. If the polyester film is pasted on one side of the screen printing housing after coating on both sides including the holes, the thermal method makes it easy even if a polyester film with a thickness of 3 to 5 μm is used as the thermoplastic synthetic resin film. The above-mentioned technical problem has been achieved by obtaining a remarkable knowledge that a perforated image can be formed, excellent printing durability, and excellent tensile strength.

  The technical problem can be solved by the present invention as follows.

  That is, the stencil sheet for thermal head heat-sensitive screen printing according to the present invention is formed by laminating a thermoplastic synthetic resin film and a screen printing casing with an adhesive, and is bonded to the thermoplastic synthetic resin film by the heat of the thermal head. A stencil sheet for screen printing that forms a perforated image of a desired character, figure or pattern by melting and perforating the agent layer, and the thermoplastic synthetic resin film is a polyester film having a thickness of 3 to 5 μm, The adhesive layer is composed of a main agent containing polyurethane and a curing agent containing tolylene diisocyanate and a urethane resin, and a ratio of 110 to 160 parts by weight in terms of solid content with respect to 100 parts by weight of solid content of the main agent. It mixes with.

  The thermal head heat-sensitive stencil sheet for thermal printing according to the present invention comprises a thermoplastic synthetic resin film and a screen printing casing bonded together with an adhesive, and a space between the thermoplastic synthetic resin film and the screen printing casing. A stencil sheet for screen printing, in which a thermoplastic synthetic resin film and an adhesive layer are melted and punched by the heat of a thermal head to form a punched image of a desired character, figure or pattern. The thermoplastic synthetic resin film is a polyester film having a thickness of 3 to 5 μm, and the adhesive comprises a main agent containing polyurethane and a curing agent containing tolylene diisocyanate and a urethane resin. It is a two-component adhesive in which a curing agent is blended at a ratio of 110 to 160 parts by weight in terms of solid content with respect to 100 parts by weight, and in the adhesive bath Those made by bonding the polyester film on one side of the screen printing gauze body after applied to both surfaces comprise 該紗 of holes was immersed clean printing Shatai.

  In the thermal head heat-sensitive stencil sheet for thermal printing, the present invention is such that the adhesive bath contains 20 to 30 times more diluent than the main agent 1.

  Further, according to the present invention, in any one of the above thermal head heat-sensitive screen printing stencil sheets, a thin film of silicon is formed on the surface of a polyester film having a thickness of 3 to 5 μm.

  The plate making method using the stencil sheet for thermal head heat-sensitive screen printing according to the present invention comprises a polyester film having a thickness of 3 to 5 μm and a polyester casing, a main component containing polyurethane, tolylene diisocyanate and a urethane resin. A thermal head heat-sensitive screen comprising a two-part adhesive in which a curing agent is blended at a ratio of 110 to 160 parts by weight in terms of solid content with respect to 100 parts by weight of solid content of the main ingredient. A thermal head is brought into contact with the polyester film surface of the stencil sheet for printing, the polyester film and the adhesive layer are melted and perforated by heat generated by heating the thermal head to a dot matrix, and desired characters, After forming a perforated image such as a figure or a pattern, the molten soot adhering to the polyester case is made into Anon, MEK, Anon It is obtained so as to remove by wiping with a mixed solution of ethyl acetate.

  Furthermore, a plate making method using the stencil sheet for thermal head heat-sensitive screen printing according to the present invention comprises a polyester film having a thickness of 3 to 5 μm and a nylon case, a main ingredient containing polyurethane, tolylene diisocyanate and a urethane resin. A thermal head heat-sensitive screen comprising a two-part adhesive in which a curing agent is blended at a ratio of 110 to 160 parts by weight in terms of solid content with respect to 100 parts by weight of solid content of the main ingredient. A thermal head is brought into contact with the polyester film surface of the stencil sheet for printing, the polyester film and the adhesive layer are melted and perforated by heat generated by heating the thermal head to a dot matrix, and desired characters, After a perforated image such as a figure or pattern is formed, the molten soot that is melted and adhered to the nylon casing is made of acetone or ethyl acetate. In which it was to be removed by wiping off at.

  According to the present invention, since a perforated image can be easily formed on a heat-sensitive screen printing stencil sheet using a polyester film having a film thickness of 3 to 5 μm, it is excellent in printing durability and can be used repeatedly. Furthermore, it is possible to provide a stencil sheet for thermal head heat-sensitive screen printing that exhibits the contradictory effect of being excellent in tensile strength even if a perforated image can be easily formed.

It is the longitudinal cross-sectional view which showed typically the thermal head heat-sensitive screen printing stencil paper which concerns on this invention. It is the longitudinal cross-sectional view which showed typically the thermal head heat-sensitive screen printing stencil paper which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.

  FIG. 1 is a longitudinal sectional view schematically showing a stencil sheet for thermal head heat-sensitive screen printing according to the present invention. In FIG. 1, reference numeral 1 indicates that the polyester film and the adhesive are melted by heat generated by the thermal head. A thermal head thermosensitive screen printing stencil sheet for punching to form a perforated image of a desired character, figure or pattern, the stencil sheet 1 comprising a polyester film 2 having a thickness of 3 to 5 μm and a screen printing stencil The hardener containing tolylene diisocyanate and urethane resin was blended with the main agent containing polyurethane in a proportion of 110 to 160 parts by weight in terms of solid content with respect to 100 parts by weight of the solid content of the main agent. The two-component adhesive 4 is used for bonding.

  The configuration of the stencil sheet 1 according to the present invention will be described in detail as follows.

  The polyester film 2 is suitable to have a thickness of 3 to 5 μm. When the thickness is 2.5 μm or less, there is a limit to the printing durability due to multiple printing of the stencil sheet, and the probability of pinholes occurring when the stencil sheet is stretched strongly increases. . When the thickness is 6 μm or more, it is difficult to melt and perforate the heat generated by the thermal head.

  If the polyester film 2 has a thermal deformation / melting temperature of 40 to 90 ° C., the heat generation temperature of the thermal head can be set to 90 to 200 ° C. or less, and a commercially available thermal head can be used.

  The screen printing housing 3 may be a polyester housing, nylon housing, or silk housing having a thickness of 50 to 80 μm that is commercially available as a screen printing housing.

The adhesive 4 is a two-component type in which polyurethane is a main component and a resin containing tolylene diisocyanate and a urethane resin is used as a curing agent. Commercially available products are two-pack adhesives made by Mitsui Chemicals Polyurethanes Co., Ltd .: Takelac A-310 (base / solvent-containing hydroxyl group-terminated urethane resin: urethane resin 48%, ethanol 0.2%, ethyl acetate 51.8%: solid content 48%) and Takenate a-3 (curing agent, solvent-containing isocyanate-terminated urethane resin: urethane resin 76%, tolylene diisocyanate _{C 9 H 6 N 2 O 2} 0.2%, ethyl acetate 23.8 percent: solids 76.2%) is optimal .

  When the mixing ratio of the main agent and the curing agent is main agent: curing agent = 1: 0.7-1 (solid content conversion: 100 parts by weight: 110-160 parts by weight), as shown in Tables 1 and 2, the adhesive strength and Suitable results are obtained in solvent resistance and plate making.

  The adhesive strength, solvent resistance, and plate-making property of Table 1 and Table 2 (the same results were obtained for the polyester films having thicknesses of 3 μm and 4 μm), Mitsubishi Diafoil Hoechst Co., Ltd. having a thickness of 3 μm and 4 μm as polyester film 2 The polyester film made from the polyester film having a thickness of 58 μm is used as the screen printing casing 3, and the obtained stencil sheet is used as a solvent for oil-based inks (Vineate Solvent: trade name: It was immersed in Nagase Screen Printing Laboratory Co., Ltd. for 7 days to examine the peeled state and solvent resistance of each polyester film. Evaluation “×” means complete peeling in the liquid, “△” means peeling if pulled, “○” means no change after 200 times of screen printing using oil-based ink, and “◎” means 500 times. No change. For plate-making, the state of melting and perforation was examined with a thermal head printer (ECOPROOYO Co., Ltd .: exothermic temperature 140 ° C.). Evaluation “×” indicates no change (bad platemaking), “△” indicates that the fine character is melted and perforated, “○” indicates that the bold character is melted and perforated, and “◎” indicates that the solid surface is melted in addition to the bold character・ Perforation (best plate making).

  From the test results shown in Tables 1 and 2, the adhesive agent layer having a solvent resistance that withstands the solvent of the oil-based printing ink by increasing the solvent resistance of the base agent: curing agent from 1: 0.6 and setting it to 1: 0.7 or more. It was confirmed that it could be formed. In addition, since poor adhesion due to insufficient moisture occurred by increasing the blending ratio of the curing agent, when bonding with a laminating machine, it is powerful just before winding into the winding device after removing the diluent with a drying drum. It was confirmed that poor adhesion could be eliminated by installing a spray device and applying a large amount of moisture.

  Next, a method for producing and making a stencil sheet according to the present invention will be described.

  First, a main agent containing polyurethane (Takelac A-310), a curing agent (Takenate A-3) containing tolylene diisocyanate and a urethane resin, and a diluent (ethyl acetate) are 1: 0.7 to 1:20 to 30. The bath of adhesive 4 is prepared by blending at a ratio of By blending 20 to 30 times the diluent with respect to the main agent 1, the concentration of the adhesive is reduced, and a thin adhesive layer is formed between the polyester film 2 and the screen printing casing 3. Thus, a perforated image can be easily formed. A diluent exceeding 30 times is not preferable because the adhesive strength is weak and the tensile strength is lowered.

  Next, the screen printing housing 3 is immersed in the adhesive 4 bath, and the screen printing housing 3 is filled with the adhesive 4, and then placed on the polyester film 2 and laminated, and pasted through a pressure-bonding roll with a cylinder. The By this method, the weakness of tensile resistance due to the small adhesion area by bonding the polyester film 2 coated with the adhesive 4 on one side of the screen printing case 3 according to the conventional method and the screen printing case 3 Is eliminated, and the adhesive 4 penetrates into the mesh of the screen printing casing 3 so that the adhesive 4 is applied to both sides of the screen printing casing 3 to form a layer, and the polyester film 2 Since stencil is adhered, a stencil sheet having a further excellent tensile strength can be obtained.

  Subsequently, the laminate of the screen printing casing 3, the adhesive 4 and the polyester film 2 is passed through a drying roller whose surface temperature is set to a temperature at which the polyester film 2 does not shrink or deform, thereby drying the adhesive 4. After removing the diluent, give a large amount of moisture using a powerful spraying device just before winding the laminate with a winding device to prevent poor adhesion, and then put it in a drying room at 40 ° C to 50 ° C The stencil paper 1 is obtained by drying for about 2 weeks.

  In addition, if the strong wind is blown with a large electric fan at the end point of the drying roller and passed through a pressure-bonding roll set to about 3 atm again, the diluent can be sufficiently evaporated.

  In the plate making process, the stencil sheet 1 is set in a thermal printer, and the polyester film 2 and the adhesive 4 are bonded by heat generated by heating the thermal head to a dot matrix based on image data created in advance by the drawing application software. Melting and drilling to form a drilled image.

  Thereafter, the molten soot adhering to the screen printing housing 3 is removed by wiping with ethyl acetate, anone, toluene, acetone, MEK, gamma-butyl lactone, xylol, or the like to obtain a base paper for plate making.

  The pressing force when the screen printing casing 3 and the polyester film 2 are bonded together with the adhesive 4 is preferably set to about 3 atm. When the pressure is 2 atm or less, the layer of the adhesive 4 is formed thick with respect to the screen printing casing 3, and when the pressure is 4 atm or more, the polyester film 2 is wrinkled. The surface temperature of the drying roller may be set to about 45 ° C.

  In addition, even if it is a perforated image with the melted soot in which the polyester film 2 and the adhesive 4 are melted, the oil-based ink permeates, so that a printed image can be obtained. When a polyester casing is used, an anon, MEK, or a mixture of anone and MEK, and when a nylon casing is used as the screen printing casing 3, wiping with acetone or ethyl acetate removes molten soot. Since it can be completely removed, a more beautiful printed image can be obtained.

  In addition, as a thermoplastic synthetic resin film, a polyester film 2 having a film thickness of 3 to 5 μm is used, and an adhesive 4 using a main agent containing polyurethane and a curing agent containing tolylene diisocyanate and a urethane resin is used. The polyester film 2 is bonded to one side of the screen printing housing 3 after the screen printing housing 3 is dipped in the adhesive 4 bath and applied to both sides including the holes of the housing 3, and At the time of pasting, since the conveyance speed is reduced from the conventional speed and it is dried in an environment of about 50 ° C or less, it can be melted and perforated even with the heat of 90 to 200 ° C generated by the thermal head, Sufficient strength for oil-based inks can be obtained.

  Further, the stencil sheet according to the present invention does not substantially melt the polyester film 2 having a thickness of 3 to 5 μm that can be deformed and melted at a temperature of 40 to 200 ° C. and the casing 3 for screen printing in the solvent for oil-based ink. Since the adhesive 4 is laminated, the polyester film 2 and the two-part adhesive 4 are melted and perforated even at a temperature of 200 ° C. or lower, which is the guaranteed operating temperature of the thermal head. A perforated image such as a pattern can be formed.

  In the stencil sheet making according to the present invention, a desired character, figure or pattern is drawn with a drawing application software, and a drawing signal is sent from a personal computer to a thermal printer. Therefore, it is not necessary to adopt a conventional photoengraving method, and a commercial screen printing original plate can be obtained easily.

Embodiment 2. FIG.

  FIG. 2 is a longitudinal sectional view schematically showing a stencil sheet for thermal head heat-sensitive screen printing according to the present invention. The same reference numerals as those in FIG. 1 denote the same or corresponding parts. A silicon thin film 5 is formed on the surface of the polyester film 2 of the stencil sheet 1 in form 1 to eliminate friction between the thermal head and the polyester film 2 to improve slipping and to prevent static electricity.

As the polyester film 2, a polyester film manufactured by Mitsubishi Chemical Polyester Co., Ltd. having a deformation / melting temperature of 40 to 200 ° C. and a thickness of 4 μm was used. As the screen printing casing 3, a polyester basket made by Nippon Special Textile Co., Ltd. having a thickness of 71 μm, a width of 1,130 mm, and 1200 mesh was used. Adhesive 4 uses a two-component adhesive (Takelac A-310, Takenate A-3) manufactured by Mitsui Chemicals Polyurethane Co., Ltd., and its main ingredients (Takelac A-310: urethane resin 48%, ethanol 0.2%, Diluted with ethyl acetate 51.8%: solid content 48%) and curing agent (Takenate A-3: urethane resin 76%, tolylene diisocyanate C ₉ H ₆ N ₂ O ₂ 0.2%, ethyl acetate 23.8%: solid content 76.2%) The agent (ethyl acetate) was mixed and diluted at a ratio of 1: 0.75: 20. For the silicon thin film 5, slipper silicone (manufactured by Tosei Chemical Co., Ltd. (silicon 10%, toluene 90% solution)) was used. Further, a wet laminator machine was used for laminating the polyester film and the polyester basket.

First, a polyester basket is dipped in an adhesive tank of a wet laminator machine, and 1.2 to 1.3 g of the adhesive 4 per 1 m ² is applied to both sides including the holes of the casing, and then the polyester coated adhesive surface is applied. The polyester film was placed on one side of the sheet, and passed through a pressure-bonding roll with a cylinder set to 3 atm.

  Thereafter, the laminate of the polyester bag and the polyester film bonded together by the adhesive 4 is passed through a drying roller having a surface temperature of about 45 ° C., and further dried by blowing a strong wind with a large fan at the end point of the drying roller. And again passed through a crimping roll set at 3 atm to evaporate about 98% of the diluent.

  Subsequently, in order to prevent adhesion failure immediately before winding the laminate with a winding device, it is wound by applying a large amount of moisture using a powerful spraying device, and then in a drying room at 40 ° C. to 50 ° C. for about 2 weeks. Finally, a slip silicone liquid was applied to the polyester film surface at a rate of about 10 g / m and dried to obtain a stencil sheet having a thickness of 90 μm.

  The stencil sheet is set in a thermal printer (thermal plate making machine: SLK250 / 300: trade name: manufactured by Graphtec Co., Ltd.), brought into contact with the thermal head, and the thermal head based on the image data created in advance by the drawing application software. Was heated to a temperature of 200 ° C., and the polyester film and the adhesive layer were melted and perforated to form a perforated image. Thereafter, the molten soot adhering to the polyester soot of the perforated image was removed by wiping with anone to obtain a printing base paper.

  The printing base paper is made into a plate made by stretching the printing base paper with a tensile strength of 1, 2 (measuring machine: Topra screen tensioner gauge) using a screen tensioner machine using an air cylinder on an aluminum screen frame, and then a T-shirt. 500 sheets of oil-based ink (Platinol: trade name: WILFLEX BLAK: manufactured by POLYONE CORPORATION) were printed on a T-shirt rotary automatic printer, but no abnormality was found. Also, no abnormality was observed when water-based ink (print color: manufactured by Dye Ota Otus Co., Ltd.) was used.

  In addition, using the printing base paper obtained here, after screen printing on 100 glass plates with oily glass ink (manufactured by Nagase Screen Printing Laboratory Co., Ltd.), the oily glass ink remaining on the printing base paper Although it was wiped off with a solvent (Eight Solvent: trade name: manufactured by Nagase Screen Printing Laboratory Co., Ltd.), no abnormality was found on the printing base paper. Furthermore, printing was repeated a plurality of times, and each time the oil-based ink for glass was wiped off with an Eight solvent solvent, no abnormality was found.

  The printing base paper obtained here was screen-printed on 300 vinyl sheets with oil-based ink for vinyl (VINYATE: trade name: manufactured by Nagase Screen Printing Laboratory Co., Ltd.) and remained on the printing base paper. The oil-based ink for vinyl was wiped off with a solvent (Eight Solvent: trade name: manufactured by Nagase Screen Printing Laboratory Co., Ltd.), but no abnormality was found in the printing base paper. Furthermore, printing was repeated a plurality of times, and each time the oil-based ink for glass was wiped off with an Eight solvent solvent, no abnormality was found.

  The two-component adhesive (Takelac A-310, Takenate A-3) manufactured by Mitsui Chemicals Polyurethane Co., Ltd. is used as the main agent (Takelac A-310): curing agent (Takenate A-3) = 1: 0.7-1 (solid content Conversion: 48 g: 53.34 to 76.20 g; 100 parts by weight: 111 to 159 parts by weight) As shown in Table 1 and Table 2, favorable results can be obtained in adhesive strength, solvent resistance, and plate making properties. . 111 is calculated from 53.34 / 48, and 159 is calculated from 76.20 / 48.

  According to the present invention, since a stencil sheet for screen printing using a polyester film having a thickness of 3 to 5 μm can be provided, the printing durability is excellent, and there are a wide variety of uses, particularly uses requiring printing with oil-based ink. Available to:

  Therefore, it can be said that the industrial applicability of the present invention is very high.

1 stencil paper 2 polyester film 3 frame 4 adhesive 5 silicon film

Claims (6)

A thermoplastic synthetic resin film and a screen printing casing are bonded together with an adhesive, and the thermoplastic synthetic resin film and the adhesive layer are melted and perforated by the heat of the thermal head to produce desired characters, figures, patterns, etc. A stencil sheet for screen printing that forms a perforated image of the above, wherein the thermoplastic synthetic resin film is a polyester film having a thickness of 3 to 5 μm, and the adhesive layer contains a polyurethane-containing main agent, tolylene diisocyanate, and a urethane resin Thermal head heat sensitivity characterized by comprising a curing agent in a proportion of 110 to 160 parts by weight in terms of solid content with respect to 100 parts by weight of solid content of the main agent. Stencil paper for screen printing. A thermoplastic synthetic resin film and a screen printing casing are bonded together with an adhesive to form an adhesive layer between the thermoplastic synthetic resin film and the screen printing casing. A stencil sheet for screen printing in which a synthetic resin film and an adhesive layer are melted and perforated to form a perforated image of a desired character, figure or pattern, wherein the thermoplastic synthetic resin film has a thickness of 3 to 5 μm It is a polyester film, and the adhesive consists of a main agent containing polyurethane and a curing agent containing tolylene diisocyanate and a urethane resin, and the curing agent is 110 to 160 in terms of solid content with respect to 100 parts by weight of the solid content of the main agent. It is a two-component adhesive compounded in a proportion of parts by weight, and the screen printing casing is immersed in the adhesive bath, and the adhesive is applied to both sides including the holes of the casing. Thermal head thermosensitive screen printing stencil, characterized by comprising on one side of the screen printing mesh cloth material bonded to the polyester film after. The stencil sheet for thermal head heat-sensitive screen printing according to claim 2, wherein the adhesive bath contains 20 to 30 times more diluent than the base material 1. The stencil sheet for thermal head heat-sensitive screen printing according to any one of claims 1 to 3, wherein a thin film of silicon is formed on the surface of a polyester film having a thickness of 3 to 5 µm.
A polyester film having a thickness of 3 to 5 μm and a polyester casing are composed of a main agent containing polyurethane and a curing agent containing tolylene diisocyanate and a urethane resin, and the curing agent is added to 100 parts by weight of the solid content of the main agent. A thermal head is brought into contact with the polyester film surface of a stencil sheet for thermal head heat-sensitive screen printing bonded with a two-component adhesive compounded at a ratio of 110 to 160 parts by weight in terms of solid content. After the dot matrix is heated and heated, the polyester film and adhesive layer are melted and perforated to form a perforated image of the desired character, figure, pattern, etc., and then melted on the polyester casing The thermal head heat-sensitive head is characterized by wiping and removing the soot with anone, MEK, or a mixture of anone and ethyl acetate. Plate-making method using the screen printing for the stencil sheet. A polyester film having a thickness of 3 to 5 μm and a nylon casing are composed of a main agent containing polyurethane and a curing agent containing tolylene diisocyanate and a urethane resin, and the curing agent is added to 100 parts by weight of the solid content of the main agent. A thermal head is brought into contact with the polyester film surface of a stencil sheet for thermal head heat-sensitive screen printing bonded with a two-component adhesive compounded at a ratio of 110 to 160 parts by weight in terms of solid content. After the dot matrix is heated and heated, the polyester film and adhesive layer are melted and perforated to form a perforated image of the desired character, figure, or pattern, and then melted on the nylon casing. A thermal head heat-sensitive screen printing stencil sheet was used, which was characterized by removing the wrinkles with acetone or ethyl acetate. Edition method.

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