JP2011201271A - Screen printing apparatus for pushing coating material on mask surface, and printing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen printing apparatus for pushing a coating material on a mask surface which stably prints excellent images in a high resolution and dimensional accuracy with a sufficiently thicker coating film thickness.SOLUTION: In the screen printing apparatus for pushing the coating material on the mask surface, a masking sheet 103 with large and small holes or streak pattern holes opened is arranged at the rear side surface of a screen fabric 102 affixed to a frame 101, and a first squeegee for pushing the coating material for printing in the openings of the masking sheet 103 or scratching the coating material for printing is arranged at the front surface side of the screen fabric 102. A second squeegee 105 for scratching a surplus adhesive coating material for printing from the rear surface of the masking sheet 103 is arranged at the rear side of the masking sheet 103 while pushing the coating material for printing in the openings of the masking sheet by sliding the second squeegee on the rear surface of the masking sheet 103.

Description

  The present invention relates to a screen printing apparatus that prints on the surface of an object to be printed using various relatively high viscosity coating materials such as various inks, resins, and conductive pastes, and a printing method therefor.

  In recent years, silk screen printing method, rotary screen printing method, etc. as a method of printing on products in various fields such as daily life, electrical system or information system as well as building material field, packaging field, publishing field, electronics field, etc. Is being used. In such a stencil printing method, a laminate formed by attaching a mask of a resin film or a metal foil such as nickel, copper or chrome foil to a sheet having nylon, a metal mesh or a porous structure except for an image portion to be printed. Using a sheet, printing is performed by applying a coating material on the surface of a printing object using a rubber or metal scraper or doctor from the front side without a mask. For this reason, coating materials with high viscosity, such as various inks, resins, and conductive pastes, are used, which are thickly applied and printed with high resolution and high dimensional accuracy.

In order to respond to this, the following conditions are required in the stencil printing method such as the silk screen printing method and the rotary screen printing method.
(1) High viscosity resin can be handled to enable printing of finer lines.
(2) The thin line printed on the printing object is printed without being disconnected.
(3) To be able to print a thin line with a stable high film thickness.

  First, in order to print a high-viscosity resin, which is the condition of (1), the high-viscosity resin passes more smoothly through the fine line pattern holes formed by the screen mesh and the mask, and the object to be printed It is necessary to be transferred to.

  In order to realize the condition (2) that no disconnection occurs, either a high-viscosity resin is not left in the holes of the fine line pattern formed on the mask, or a large amount of the high-viscosity resin is obtained by some method. It is necessary to transfer to the printing object.

  In order to enable a stable and high-thickness thin line that is the condition of (3), it is necessary to always fill a hole of a fine line pattern formed by a mask with a stable amount of resin.

  However, it has been difficult for conventional screen printing methods to cope with these problems. The reason for this will be described as a specific example as follows.

  FIG. 4 schematically shows a conventional silk screen and rotary screen printing method. A printing plate 100 used in a conventional printing method is such that the outer periphery of the collar 102 is attached to a metal or wooden square frame 101 such as aluminum and the back side of the collar 102 in a state where the collar 102 made of nylon or stainless steel is spread. Alternatively, the masking sheet 103 made of resin or metal foil is attached to the lower surface. On the masking sheet 103, a large or small hole or line pattern opening is formed by a direct laser irradiation method or an etching method, or a photosensitive resin is applied and then a large or small hole or line pattern is formed by a photoengraving method or the like. The opening is formed. On the upper side or the front side of the printing plate 100, a plate-shaped scraper or doctor 104 made of metal or resin is disposed.

  When printing is performed using this conventional screen printing apparatus, the printing is performed in the order of steps shown in FIGS. First, FIG. 5A shows a state in which ink or paste 202 made of resin or the like starts to be scraped from the left side to the right side of the ridge 102 from the upper side or the front side of the printing plate 100 using a scraper or doctor 104. At this time, the cavity 204 formed by the previous printing and a part of the ink or paste 202 remain in the portion 203 in which the large and small holes or the line pattern is opened on the back side of the ridge 102.

  Then, the printing process starts from this state. That is, the ink or paste 202 is pushed into the ridge 102 from above the ridge 102 by the scraper or doctor 104, and the ink or paste 202 is transferred to the printing object 201. FIG. 5B shows a state in which the ink or paste 202 has been scraped from the left side to the right side of the ridge 102 with a scraper or doctor 104. As shown in FIG. 5C, the ink or paste 202 in the opened portion 203 is transferred to the printing material 201, but the opened portion 203 is caused by the presence of the cavity 204 in the opened portion 203. Are printed on the print object 201 in a state of being biased with respect to the print object 201.

  The state shown in FIG. 5C is a state in which the printing object 201 on which the ink or paste 202 composed of the resin or the like transferred by the processes so far is placed is separated from the masking sheet 103 and printing is completed. The film height 507 of the ink or paste 202 transferred to the substrate 201 in this printing finished state is in a state where the film height 507 is nonuniform and partially lower than the area to be printed.

  FIG. 6 shows an example of a state in which the printing surface is observed from directly above when printed by the conventional printing method described above. The printing pattern here is a rectangular hole in which the opened portions 203 are arranged at equal intervals in the vertical and horizontal directions, but the printing area of the ink or paste 202 composed of the transferred resin or the like is smaller than the opened portion 203. I see some places. Further, the ink or paste 202 transferred to the substrate 201 due to the cavity 204 of the opened portion 203 partially causes a resin transfer time difference at the time of the transfer, and shifts in a shifted manner to the opened portion 203. There are some parts that protrude from the area, thin parts, and dirty parts that are connected to the next part. That is, FIG. 6 shows that the reproducibility is insufficient with the conventional one.

  By the way, in the case of printing a fine line having a large or small hole or image line width of 20 μm to 100 μm, it is necessary to increase the viscosity of the ink or paste 202 made of resin or the like. Therefore, when using a highly viscous ink or paste, the reproducibility of sharp lines and film thickness tends to be insufficient with the conventional silk screen and rotary screen printing methods.

Japanese Patent Laid-Open No. 11-157042

  In conventional printing methods such as silk screens and rotary screens, when high-definition lines and thin lines with high film thickness are continuously printed, the resin is once transferred to the object to be printed and then formed on the metal mask and resin mask. The resin in the hole disappears and a cavity is easily formed. Then, when the next printing is performed with this cavity remaining, there is a difference in resin transfer time to the printing object by the distance of this cavity, and sufficient resin transfer cannot be performed, for example, disconnection occurs. Or problems such as the required film thickness not being obtained.

  The present invention has been made paying attention to the above-mentioned problems, and is a mask surface coating material indentation screen printing capable of stably printing an excellent image having a sufficiently thick coating film thickness, high resolution and high dimensional accuracy. An object of the present invention is to provide an apparatus and a mask surface coating material indentation screen printing method.

  The present invention includes a ridge stretched on a frame, a masking sheet arranged on the surface on the back side of the ridge and having a large or small hole or a hole in an image line pattern, and an opening of the masking sheet disposed on the front side of the ridge. A first squeegee for pushing or scraping the coating material for printing, and the sliding material disposed on the back side of the masking sheet and sliding on the back surface of the masking sheet while pushing the printing coating material into the opening of the masking sheet A mask surface coating material pressing screen printing apparatus, comprising: a second squeegee for scraping off excess printing viscous paint from the back surface of the masking sheet.

  In another aspect of the present invention, a masking sheet having large or small holes or image line patterns is disposed on the surface of the back side of the ridge stretched on the frame, and the masking sheet is pressed while the printing material is pushed in from the front side of the ridge by a first squeegee. Scrape off excess printing coating material from the surface of the sheet, and then slide the second squeegee on the back side surface of the masking sheet to push the printing coating material into the opening of the masking sheet and backside the masking sheet The mask surface coating material indentation screen printing method is characterized in that an excessive printing coating material is scraped off from the surface.

  In the present invention, for example, from the side of a metal mask using a metal foil and a resin mask using an emulsion, for example, a rubber or metal squeegee or a scraper, a doctor or the like is used to press the resin into the cavity of the mask in advance. It is possible to perform normal printing after scraping off excess ink at the mask level.

  In addition, the present invention is a masking in which a hole or an image pattern having a width of 1 μm to several mm is opened in a metal foil or a resin film, for example, on the back side or lower surface of a bag attached to a metal or wooden frame. It is possible to provide a structure in which a sheet is provided and a plate-shaped scraper or doctor formed of, for example, metal or resin is disposed on the masking sheet side.

  Furthermore, the present invention provides, for example, a masking sheet on the back or lower surface of a bag attached to a metal or wooden frame, and a scraper or doctor is disposed on the masking sheet side. It is possible to carry out the step of pushing the coating material from the surface on the masking sheet side into the cavity formed in the film of the masking sheet.

  According to the present invention, it is possible to stably print a high-viscosity resin with a high fine line to a thick film thickness by a printing method using a mask such as a conventional silk screen method and a rotary screen method. By enabling the printing of a thick film with a high fine line, the following specific effects (1) to (8) can be obtained.

  (1) According to the present invention, for example, an IC card antenna (coiled pattern), a solar battery backsheet conductive wiring, an electromagnetic shield, a touch panel ITO wiring or the like is printed on a sheet of PET, PEN, acrylic, etc. Since it is possible to print conductive ink, conductive paste, etc. with high thin lines and a thick film thickness, the cross-sectional area of wiring as an electronic circuit is improved. The metal circuit, which has been conventionally formed by the etching method, can be easily replaced with conductive ink and conductive paste.

  (2) According to the present invention, for example, an IC card antenna (coiled pattern), a solar battery backsheet conductive wiring, etc. are copper, aluminum, iron, lead, SUS, tin, zinc, titanium, gold, silver, etc. With a high-thin wire, the conductive sheet alone or copper, aluminum, iron, lead, SUS, tin, zinc, titanium, gold, silver or other conductive sheet attached to a sheet of PET, PEN, acrylic, etc. Thick preservatives and anti-corrosion inks can be printed stably, and the image area can be printed using chemicals such as hydrochloric acid, sulfuric acid, ferric chloride, cupric chloride, aqua regia, nitric acid. When the insulating part is formed by corroding and removing the conductive sheet and metal surface other than the above, the chemical resistance of the preservative in the image area and the film thickness of the corrosion-resistant ink is improved, and Line defects are reduced.

  (3) According to the present invention, when a fine expression design of the image area and the non-image area is expressed, since the adjustable range of the viscosity of the application material is widened, there is no restriction of the application material in any film thickness. You can print.

  (4) According to the present invention, it is possible to print by changing the type of the resin on the mask side and the resin that is not on the mask side, and two layers of resin can be printed simultaneously by one printing.

It is a schematic explanatory drawing of the printing system applied to one Embodiment of this invention. It is explanatory drawing which shows roughly the process of the printing system applied to one Embodiment of this invention. It is explanatory drawing which shows roughly the printing state which applied the printing system of this invention and was printed by this printing system. It is a schematic explanatory drawing of the existing silk screen printing system. It is explanatory drawing which shows the process of the existing silk screen printing system roughly. It is explanatory drawing which prints by the existing silk screen printing system actually, and shows the printed printing state roughly.

  Hereinafter, a printing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a printing plate 100 applied to a printing apparatus according to an embodiment of the present invention. In the printing plate 100, the outer periphery of the collar 102 is attached to a metal or wooden square frame 101 such as aluminum and the back side (lower side) of the collar 102 with the collar 102 made of nylon or stainless steel spread. ) Is attached to a masking sheet (mask) 103 made of, for example, a metal foil. The masking sheet 103 is formed with a large or small hole or a line pattern hole by a processing method or etching that directly irradiates a metal foil with a laser over a region necessary for printing to form a large or small hole or a line pattern hole. In addition, by applying a photosensitive resin to a metal foil, and then exposing to developing, etching, and then etching to form large and small holes or line pattern holes, etc. A hole is formed. The masking sheet 103 of the printing plate 100 has large or small holes or image line pattern holes depending on the printing pattern.

  Further, on the upper side (front side) of the printing plate 100, for example, a first squeegee 104 as a coating material pushing member such as a plate scraper, doctor or squeegee formed of metal or resin (in the present invention, these are called squeegees). Is placed. The first squeegee 104 is an operation member that presses the ink or paste 202 or the like, which is a viscous paint for printing, from the upper side of the ridge 102 and prints it.

  Further, on the sheet side (lower side or back side) which is the lower side or the back side of the printing plate 100, a plate-shaped scraper, doctor, squeegee or the like formed of, for example, metal or resin, which is a feature of the present invention. A second squeegee 105 is disposed as a coating material pushing member (in the present invention, this is called a squeegee). The second squeegee 105 pushes in a coating material such as ink or paste 202 which is a viscous paint for printing formed of a resin or the like protruding from the lower side of the masking sheet 103 which is the lower side or the back side of the plate.

  When printing is performed using this screen printing apparatus, the printing is performed in the order shown in FIGS.

  First, FIG. 2A shows a state in which a masking sheet 103 having a large or small hole as a printing pattern or a hole in an image line pattern is applied to or placed on the back or lower surface of the collar 102. This state is a state in which all previous printing processes have already been completed and the printed substrate 201 has been removed. In this state, a coating material for printing, for example, an ink or paste 202 applied material made of resin or the like remains in the portion of the ridge 102, and a large or small hole formed in the masking sheet 103 located on the back side of the ridge 102 or In the opened portion 203 in which the hole of the image line pattern is formed, there is a cavity (space) 204 formed by the ink or paste 202 having been removed during the previous printing.

  Next, in the step shown in FIG. 2B, a step of pushing the ink or paste 202 from the back side or the lower side of the sheet 103 into the cavity 204 formed by the ink or paste 202 being removed during the previous printing. (This step is the main step of the present invention). That is, the ink or paste 202 on the surface other than the portion 203 where the second squeegee 105 opens the large or small hole or the image line pattern is rubbed against the back surface of the sheet 103, and the ink or paste 202 is applied to the back side or below the masking sheet 103. The sheet is pushed into the space 204 at a level matching the sheet surface 205 on the side. Further, the paste 202 is scraped off so that the ink or the paste 202 on the surface other than the portion 203 where the large or small hole or the line pattern is opened does not remain. By this process, the cavity 204 formed in the portion 203 where the small or large holes or the line pattern holes formed on the back side of the ridge 102 are opened is forcibly filled to a level where the ink or paste 202 matches the sheet surface 205. It will be in the state.

  Next, as shown in FIGS. 2 (c) and 2 (d), the ink or paste 202 made of resin or the like using the first squeegee 104 from the upper side or the front side of the printing plate 100 is transferred from the left side to the right side of the ridge 102. Scratch the upper surface of the ridge 102 at a constant speed. At this time, since the ink or paste 202 is buried in the portion 203 opened in the previous step shown in FIG. 2 (b), the ink or paste 202 is integrated into a unitary mass in the downward direction. Extruded and transferred to the surface of the substrate 201 disposed below the masking sheet 103. The ink or paste 202 is applied to the surface of the printing object 201 in a shape corresponding to the shape of the portion 203 in which large and small holes or image line patterns are opened in an undisturbed state and in a sufficient amount.

  Next, as shown in FIG. 2 (e), the printed material 201 on which the ink or paste 202 composed of the resin or the like transferred in the steps of FIGS. 2 (a) to (d) is placed is the masking sheet 103. And the printing is finished. FIG. 2E shows that the film height 206 of the ink or paste 202 transferred to the substrate 201 is uniform and is in a desired high (thickness) state.

  FIG. 3 conceptually shows an example of a state where the printing surface of the ink or paste 202 transferred to the substrate 201 in the process of the above embodiment is observed from directly above. In this case, the opened part of the print pattern is in the form of rectangular holes arranged at equal intervals in the vertical and horizontal directions, and it can be seen that the ink or paste is uniformly printed on the printing material according to the shape.

  The printing method of the present invention is a printing apparatus capable of applying each coating material in a predetermined pattern with a predetermined film thickness by applying a plurality of types of coating materials using a plurality of planographic printing units. Is possible.

A printing plate was prepared using a frame 101 having a plate surface portion of 940 mm × 940 mm using a member of the ridge 102 having a thickness of 350 μm mainly composed of nickel. Further, a plate-shaped scraper or doctor 105 made of metal or resin is disposed on the lower surface side of the printing plate, and a plate-shaped scraper or doctor 104 is disposed on the upper surface side.
Also in this embodiment, printing is performed in the order of the steps shown in FIGS. 2A to 2E described above, and the same effects as described above can be obtained.

Example 1
A polyethylene terephthalate (PET) film having a thickness of 50 μm was used as the substrate 201, and a commercially available conductive silver paste (Taiyo Ink Manufacturing Co., Ltd. ECM-100) was applied in a shield mesh pattern for PDP. It was confirmed that the shield mesh pattern (after drying) of the obtained conductive silver paste formed a high-definition image line having a width of 30 μm while having a film thickness of 30 μm.
In Example 1, it was possible to use a high-viscosity conductive silver paste for silk screen.

Further, as a result of examining the conductivity of the obtained shield mesh pattern for PDP, it was confirmed that the resistance value was as low as 5 × 10 ⁻⁵ Ω · cm.

(Example 2)
In the printing unit for the first color, a shield mesh pattern for PDP is printed with a conductive silver paste in the same manner as in Example 1 and dried through a drying furnace. After that, the printing unit for the second color is generally called a solder resist. The insulating ink was printed with a solid coating. As a result, a layer of insulating ink could be laminated on the shield mesh pattern printed with the conductive silver paste.

After drying, as a result of conducting a continuity test of the shield mesh pattern for PDP, the resistance value is 5 × 10 ⁻⁵ Ω · cm, which is the same as in Example 1, and the laminate of the shield mesh pattern for PDP and the insulating layer is I found it possible. Furthermore, it was found that by using a multicolor gravure printing machine having a large number of printing units, it is possible to form a multilayer circuit having 8 to 10 layers.

  According to the present invention, it is possible to sharpen a wiring pattern related to an electronic device, increase the cross-sectional area, and to form a low heat generation circuit having a small electric resistance value.

  According to the present invention, a multilayer circuit formed of a conductive wire layer and an insulating layer related to an electronic device can be easily formed in a short time.

  According to the present invention, it is possible to express designs that have been difficult to express so far, such as delicate patterns of decorative sheets for building materials, such as abstract patterns.

  According to the present invention, a microchannel or a microflask having a structure in which a groove is dug in a polymer base having a width of several μm and a depth of several μm for research and industrial purposes in the medical field is again covered with a polymer. A large amount of chips can be manufactured at low cost.

  By using this, for example, the aqueous chelate solution and the oil phase can be mixed at a micro level, and the chelate compound can be dissolved and separated from the oil / water interface to the oil phase.

  In addition, chemical reactions at the micro level are possible with this channel, and DNA analysis with a laser or the like is also possible.

  According to the present invention, by reducing the scale of the system of the present invention in size, it can be applied to ultra fine pattern printing.

  This invention enables multi-color printing with a film thickness, and can be expected to develop into the multi-layer color food printing field as food processing printing.

DESCRIPTION OF SYMBOLS 101 ... Frame 102 ... １０３ 103 ... Masking sheet 104 ... Scraper or doctor 105 ... Scraper or doctor arranged on the back side 201 ... Printed material 202 ... Ink or paste 203 ... Open part 204 ... Cavity 205 ... Sheet surface 206 ... Film height

Claims (2)

With a spear stretched around the frame,
A masking sheet disposed on the surface of the back side of the ridge and having a large or small hole or a hole in an image line pattern;
A first squeegee that is arranged on the front side of the ridge and for pushing or scraping the coating material for printing into the opening of the masking sheet;
It is arranged on the back side of the masking sheet, for scraping off the excess printing viscous paint from the back side of the masking sheet while sliding the back side of the masking sheet and pushing the printing coating material into the opening of the masking sheet. With the second squeegee,
A mask surface coating material indentation screen printing apparatus comprising:   A masking sheet having large or small holes or line patterns is arranged on the surface on the back side of the cocoon stretched on the frame, and the printing material is pushed from the front side of the cocoon by a first squeegee from the surface of the masking sheet. The excess printing material is scraped off, and then the second squeegee is slid on the back side of the masking sheet to push the printing coating material into the opening of the masking sheet, and from the back surface of the masking sheet A mask surface coating material indentation screen printing method, wherein the coating material is scraped off.

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