JP2013202895A - Method of manufacturing screen printing plate, and screen printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen printing plate for a screen printing machine to eliminate a printing failure which happens easily when a printing element of a pattern is parallel to both a screen frame and a halftone at the same time.SOLUTION: A screen printing plate relates to a method for manufacturing the screen printing plate and a printing plate face which can prevent a halftone and a screen frame from being put in parallel when a screen fabric is drawn to the screen frame. Preparing a plate face in such a way that the halftone of the screen fabric is brought into contact with the screen frame at an angle not only prevents a halftone deviation and a cutting of a contact point of the screen frame and the screen fabric which are caused by a contact pressure due to a squeegee during printing but also improves printing element reproducibility.

Description

  The present invention relates to a method for producing a screen printing plate having excellent printing quality stability and a screen printing plate.

  In screen printing, a plate surface is prepared by fixing a screen wrinkle made of mesh made of silk, nylon, polyester or the like to a plate frame. This is a printing method in which ink is put on the plate surface, and the ink on the plate surface is leveled with a rubber spatula called a squeegee so that the ink passes through the screen ridge and the ink is transferred to the printing substrate. At this time, various designs can be printed by forming a coating on the screen so as to prevent the passage of ink according to the design to be printed.

  The ink film thickness can be changed according to the fineness and roughness of the screen and the printing pattern, so it can be raised and printed on cloth, plastic, glass, metal, etc. in addition to paper. Used for printing on various materials.

  For the production of screen printing plates, it is common to use screen tensioning devices. The screen tensioning device holds the four sides of a square or rectangular screen with a clamping device and pulls the screen. If the screen 紗 is held flat with tension applied, press the plate frame against the screen 紗 and apply an adhesive to the screen 紗 that is in contact with the plate frame to bond the screen 固定 to the plate frame. doing.

  Various methods of tensioning the screen are provided because the maintenance of the tension and the distortion of the screen wrinkle affect the subsequent print quality. For example, a screen mesh tensioning method is disclosed in which the tension of the screen ridge is once extended at a value higher than the value at the time of fixing the screen ridge, and the tension is applied again to fix the screen mesh to the screen plate frame (for example, , See Patent Document 1).

  In addition, as a method for easily and surely attaching the screen ridges regardless of variations in the thickness dimensions of the plate frame, the plate frame is placed on the loading table of the tension machine and a predetermined tension is applied above the plate frame. A screen stretching method is used in which a given screen ridge is placed and the plate frame pushes up the screen ridge so that the screen ridge is adhered to the plate frame (see, for example, Patent Document 2).

  As for the screen tension method for the plate frame in such screen printing, when the screen collar is fixed to the plate frame, the adhesive is not easily peeled off without using a solvent, and when the sheet is stretched again. However, as a method for stretching a new adhesive, a method for stretching a plate making frame in screen printing has been disclosed (for example, see Patent Document 3).

  In addition, in order to improve the durability by preventing pattern defects due to swelling of the patterning agent near the end face in screen printing and preventing screen breakage at the start and end of printing, There is a screen printing plate that can be printed in a state in which a rectangular printing section is provided on the top, and the rectangular printing section is inclined with respect to the printing direction and the substrate is inclined with respect to the printing direction (for example, (See Patent Document 4).

Japanese Patent Laid-Open No. 4-85083 JP 2004-106372 A JP 2000-25195 A Japanese Patent Laid-Open No. 5-181283

  In the case of screen printing using a screen plate surface produced by a conventional manufacturing method, the present applicant, when the screen mesh and the frame end face are parallel to the same direction, in particular, printing mainly consisting of straight lines. It was necessary to take measures to easily become parallel to the side of the pattern and to cause uneven printing line width.

  This is because in screen printing, when the ink on the screen plate is squeezed with a rubber spatula called squeegee and slides on the plate surface, the screen wrinkles due to the pressure of the squeegee, and due to the deflection, the square mesh The shape is generated by abduction. If the screen frame and the screen mesh are parallel, the effect is significant. Not only the mesh is crushed, but the edge of the plate frame and the wire of the screen cage parallel to the pattern may be greatly displaced. .

  In particular, at the start and end of printing, the squeegee applies printing pressure near the adhesion point between the screen plate and the plate frame on the screen plate surface. Had an effect.

  As a countermeasure against such a problem, it is common to prevent the occurrence of such a problem by increasing the strength of the screen ridge or selecting a material that is difficult to stretch. However, when performing high-definition printing, the mesh of the screen ridges may use a fineness of about 255 lines / inch, and even if a material that is difficult to stretch or a stretch-proofing process is used, the above-mentioned problem still cannot be solved. was there.

  As in Patent Document 4, the pattern of the screen printing plate is inclined with respect to the mesh of the plate frame and the screen ridge, so that the patterning agent swells on the end surface of the printing plate at the start of printing, and the color of the end portion Although measures are being taken to prevent darkening of the color, uneven printing such as uneven color, and the screen plate surface being easily cut off at the start and end of printing, the plate life is shortened. It is necessary to dispose it obliquely with respect to the flow direction, and it cannot be applied depending on the printing object.

  Therefore, the present applicant has paid attention to the fact that printing defects are likely to occur due to misalignment of the stitches when the image lines of the design are parallel to the plate frame and the mesh at the same time. In the case where they are not parallel at the same time, it was ascertained that no printing failure due to this cause occurred, and the present invention was achieved.

  The present invention aims to solve the above-described problems, and provides a method for producing a screen printing plate in which a screen ridge used in a screen printing machine is stretched over a plate frame.

  In order to achieve the above object, the screen printing plate and the method for producing the screen printing plate of the present invention are characterized in that the mesh and the plate frame are not parallel when the screen ridge is stretched on the plate frame. A method and a printing plate.

  In the method for producing a screen printing plate of the present invention, the screen wrinkle holding portion is arranged such that the side of the screen wrinkle serving as a reference is parallel or perpendicular to the side of the screen wrinkle holding portion of the screen tensioner. The plate frame is horizontally angled on the loading platform below the fixed screen so that the reference side of the plate frame is not parallel to the reference side of the screen mesh. The screen printing plate manufacturing method is characterized in that the plate frame and the screen ridge are attached and fixed at a portion where the plate frame and the screen ridge are pressed together.

  The method for producing a screen printing plate of the present invention is a method for producing a screen printing plate characterized in that the angle between the screen frame and the screen mesh is 1 to 89 degrees.

  The screen printing plate of the present invention is fixed at an angle in the horizontal direction so that the reference side of the screen mesh is not parallel to the reference side of the plate frame on which the screen is attached. Is a screen printing plate characterized by

  The present invention is the screen printing plate characterized in that the side serving as the basis of the screen mesh is fixed at an angle of 1 to 89 degrees with respect to the side serving as the basis of the plate frame.

  According to the present invention, the mesh of the screen ridge is made uniform, and the ink amount pushed out from the mesh by the squeegee is noticeably positive and the ink pile amount is made uniform. As a result, the image line reproducibility was improved, and it was effective in preventing moire, resulting in improved prevention of printing defects.

  Moreover, since the running stability of the squeegee is improved by the present invention, the durability of the squeegee is also improved.

  In addition, the present invention makes it easy to maintain the appropriate tension of the screen ridge, and in particular, the printing pressure of the squeegee is likely to be greatly applied. At the start and end of printing, the screen ridge can absorb the printing pressure in a balanced manner. As a result, the screen was prevented from being cut and the printing durability of the screen printing plate was improved.

It is the schematic which looked at the screen printing plate tension machine from the upper surface. It is the schematic which looked at the tension machine of the screen printing plate from the side. It is a figure which fixes a screen ridge to the plate frame in a tension machine. It is a state figure (before screen tension) of processing of a screen basket by a conventional example. It is a state figure (at the time of screen tensioning) of processing of a screen collar by a conventional example. It is the schematic of the screen printing plate produced by the prior art example. It is a state figure (before screen wrinkling) of processing of a screen wrinkle in Example 1 of the present invention. It is a state figure (at the time of screen wrinkling) of the process of the screen wrinkle in Example 1 of this invention. It is the schematic of the screen printing plate produced with the preparation method by this invention.

  DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments for carrying out the invention described below, and various other embodiments are possible within the scope of the technical idea described in the claims. included.

  Next, the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a screen printing plate tensioner as viewed from above. FIG. 2 is a schematic view of a screen printing plate tensioner as viewed from the side. FIG. 3 is a diagram in which a screen ridge is fixed to a plate frame in a tensioning machine. FIG. 4 is a state diagram (before screen tensioning) of the processing of screen scissors according to a conventional example. FIG. 5 is a state diagram of processing a screen ridge according to a conventional example (when the screen cocoon is stretched). FIG. 6 is a schematic view of a screen printing plate produced by a conventional example. FIG. 7 is a state diagram (before screen tensioning) of the process of screen scissors according to the first embodiment of the present invention. FIG. 8 is a state diagram (when the screen is stretched) of the processing of the screen ridge according to the first embodiment of the present invention. FIG. 9 is a schematic view of a screen printing plate produced by the production method according to the present invention.

  In screen printing, a photosensitive resin is applied to a screen plate surface with a screen frame attached to a plate frame by a plate making applicator, and the pattern is exposed and transferred to a dried product by a film. After exposure and transfer, the image is developed with a developing machine to produce a screen plate. The screen plate is incorporated in a screen printing machine (not shown), and the ink is placed on the screen tub, and the ink that passes through the mesh of the screen tub is transferred to the printing substrate by smoothing with a rubber spatula called a squeegee.

  The screen printing plate used in this screen printing machine is produced by a tensioning machine. To attach the screen 方法, place the plate frame on the pedestal of the tensioning machine, spread the screen に above it, fix the four sides with fixtures, raise the plate frame together with the pedestal from below, The adhesive is applied to the plate frame when it is pressed against the plate frame, and the plate frame and the screen ridge are fixed.

  The present invention is implemented by preventing the screen meshes from being arranged in parallel with the inner peripheral end face of the plate frame when the screen kite is stretched on the plate frame by a tensioning machine.

  This means that when the screen plate surface is placed on the top and bottom with respect to the printing direction, the screen ridge is tilted within a range of 1 to 89 degrees with respect to the top and bottom direction. As a numerical value suitable for execution, the numerical value is appropriately executed within a range of inclination of 5 degrees to 85 degrees. The best range is an inclination range of 10 degrees to 80 degrees.

  In this method of manufacturing the screen plate surface, the side of the mesh and the side of the holding unit are fixed so that the mesh of the screen is not deformed in the screen cage holding part of the tensioner so that the mesh of the screen basket is not deformed. Next, the plate frame is tilted with respect to the mesh of the screen ridge so as not to be parallel to the mesh, and is placed on the pedestal of the tensioner.

  Then, the pedestal is raised or the screen is lowered, and the plate frame is pressed against the screen. The part where the plate frame and the screen ridge are in contact is fixed with an adhesive. When the screen is fixed by the adhesive, it is removed from the tensioning machine in a state where the screen ridge and the plate frame are integrated, and an excess screen ridge protruding from the outer periphery of the plate frame is cut off to complete the screen plate surface. A design is appropriately prepared on this screen plate surface and used for printing.

  There are various types of tensioning machines, but the embodiment of the present invention does not depend on a particular tensioning machine, and the screen tensioning or plate frame can be set in an oblique direction for plate making. Any form may be used. Needless to say, the same theory can be applied to the case where the screen ridge is manually attached to the plate frame.

  Hereinafter, although the Example which produced the screen printing plate concretely according to the form for implementing the above-mentioned invention is demonstrated in detail, this invention is not limited to this Example.

  Embodiment 1 of the present invention will be described with reference to the drawings. The image of the screen mesh of the screen printing plate to be obtained is as illustrated in FIG. For Examples 1 to 3 and Comparative Example 1, the screen wrinkle is made of 100% polyester and has a wrinkle thickness of about 53 μm.

  For screen tensioning, an air stretcher type tensioning machine (trade name: SK.T-1000 tensioner for screen plate, manufactured by Kuranami Co., Ltd.) was used. The plate frame is placed on the pedestal at an angle of 15 degrees with respect to the tensioning machine and the screen tension that is stretched on the machine according to the vertical and horizontal orthogonal axes. A screen printing plate was produced. The set tension was 1.4 N / mm, and a screen ridge was stretched in the horizontal direction against a square aluminum plate frame (frame width 40 mm, thickness 30 mm, outer dimension 880 mm × 880 mm). The set tension is measured using a value measured by a tension gauge (trade name: SCREEN TENSION GAUGE, manufactured by Protec Co., Ltd.).

  The produced screen printing plate is coated by a plate-making coater, exposed to light by an exposure machine using a plate-making film, and the pattern is copied by a known method such as developing by a developing machine. A printing plate surface was prepared.

  When printed using a screen printer, particularly excellent print quality was obtained.

  Using a tensioning machine similar to that in Example 1, the plate frame is attached at an angle of 30 degrees with respect to the tensioning machine and the screen tension stretched on the machine along the vertical and horizontal orthogonal axes. Placed on a pedestal, screen screen and plate frame were pasted to produce a screen printing plate. The set tension was 1.4 N / mm, and a screen ridge was stretched in the horizontal direction against a square aluminum plate frame (frame width 40 mm, thickness 30 mm, outer dimension 880 mm × 880 mm).

  The produced screen printing plate was similarly printed with a well-known method to produce a printing plate surface and printed using a screen printer, and excellent printing quality was obtained.

  Using the same tensioning machine as in Examples 1 and 2, the plate frame was angled at 45 degrees with respect to the tensioning machine and the screen tension that is stretched along the vertical and horizontal orthogonal axes on the machine. A screen printing plate was produced by placing the screen on a pedestal and attaching a screen ridge and a plate frame. The set tension was 1.4 N / mm, and a screen ridge was stretched in the horizontal direction against a square aluminum plate frame (frame width 40 mm, thickness 30 mm, outer dimension 880 mm × 880 mm).

  The produced screen printing plate was similarly printed with a well-known method to produce a printing plate surface and printed using a screen printing machine to obtain an appropriate printing quality.

(Comparative Example 1)
Using the same tensioning machine as in Examples 1, 2, and 3, the plate frame is not angled with respect to the tensioning machine and the screen tension that is stretched along the vertical and horizontal orthogonal axes on the machine. A screen printing plate was produced by placing the screen on a pedestal and attaching a screen frame and a plate frame. The set tension was 1.4 N / mm, and a screen printing plate was produced in which a screen ridge was stretched in a horizontal direction on a square aluminum plate frame (frame width 40 mm, thickness 30 mm, outer dimension 880 mm × 880 mm).

  Similarly, when the screen printing plate produced was printed with a screen printing machine by copying a pattern by a known method, the image line reproducibility was slightly inferior to those of Examples 1 to 3. It became print quality. Table 1 shows the printing results for Examples 1 to 3 and Comparative Example 1.

  When the tension was kept constant and the effect of changes in the screen heel angle was investigated, the superiority of the print quality due to the screen heel angle was found. Needless to say, depending on the screen font material, mesh shape, line fineness, etc., the printed result may differ from this printing result. It is a matter of course that the above is appropriately set. However, it has been proved that the screen wrinkle angle improves the printing quality such as image reproducibility and the durability of the screen wrinkle.

DESCRIPTION OF SYMBOLS 1 Clamping device 2 Clamp bar 3 Stretcher 4 Lifting table 5 Operation panel 6 Tightening machine 7 Plate frame 8 Screen 紗

Claims (4)

A method for producing a screen printing plate,
A screen 紗 is fixed with the screen 紗 holding part so that the side of the screen 網 serving as a reference is parallel or perpendicular to the side of the screen 紗 holding part of the screen tensioner,
The plate frame is placed at a horizontal angle on the loading platform below the fixed screen cage so that the reference edge of the plate frame is not parallel to the reference edge of the mesh of the screen cage. Install
A method for producing a screen printing plate, wherein the plate frame and the screen ridge are bonded together and fixed at a site where the plate frame and the screen ridge are brought into contact with each other.   The method for producing a screen printing plate according to claim 1, wherein the angle is 1 to 89 degrees. A screen printing plate produced by the method for producing a screen printing plate according to claim 1 or 2,
A screen printing plate characterized by being fixed at an angle in a horizontal direction so that a side serving as a reference of a screen mesh of the screen is not parallel to a reference side of a plate frame on which the screen is attached .   4. The screen printing plate according to claim 3, wherein a side serving as a reference of the screen mesh is fixed at an angle of 1 to 89 degrees with respect to a reference side of the plate frame.

Images