JP3523820B2 - Screen back-off method and screen back-off method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a screen backing for cleaning a screen used for screen printing. In particular, the present invention relates to an invention using a resin material as a backing material for backing a screen. 2. Description of the Related Art After screen printing is performed on a work (substrate), ink remains on the back side of the screen, or ink oozes out, so that the screen back side is printed before printing on the next work. Need to be cleaned. This cleaning of the back side of the screen is called backwashing. Conventionally, the back of the screen is performed by an operator manually wiping the back of the screen using cloth or paper. Alternatively, a screen backing device was developed, in which cloth, paper or adhesive tape drawn from a roll was stuck to the back side of the screen, and the ink remaining on the back side of the screen was transferred to the cloth, paper or adhesive tape. A backlash can be performed. [0003] In the case where the screen is manually wiped by a human, it takes time and labor, and there is a problem that the screen printing cannot be automated. [0004] In addition, when screen backing is performed by a screen backing device, a large amount of cloth, paper, or adhesive tape is consumed, and consumables for screen backing are expensive. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to make it possible to reuse a backing material for backing a screen. [0006] The screen backing method according to the present invention is a screen backing method for backing a screen used for screen printing with a backing material. The material is a resin material. The resin material is a flat plate having a plurality of concave portions on the surface. [0008] The resin material is a photosensitive resin plate, and the plurality of recesses are holes formed by exposing and developing the photosensitive resin plate. In a screen backing method for backing a screen used for screen printing with a backing material,
The backing material is a flat plate having a plurality of concave portions on the surface. [0010] The flat plate is formed of a resin material. [0011] The flat plate is characterized by being formed of a flexible material. [0012] The screen backing method according to the present invention comprises:
In a screen backing method for backing a screen used for screen printing with a backing material, a backing material having a plurality of recesses on its surface is pressed against the back side of the screen to fill the plurality of recesses with ink. And a step of backlashing is provided. [0013] In the above screen backing method, further, after the backing step, the backing material is washed and ink is removed from the backing material, and after the ink removing step, the backing is performed again. And a reusing step used in a step of backing the wood. [0014] The above screen backing method further comprises a step of drying the backing material after the step of taking ink. [0015] The screen backing method further comprises a step of forming the backing material with a resin material. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a view showing a resin plate 51 of this embodiment and a partially enlarged cross-sectional perspective view thereof. The resin plate 51 has a large number of holes 53 on the surface. The holes 53 are two-dimensionally arranged. The hole 53 has a bottom, a circular surface shape, and a cylindrical shape. The diameter D of the surface hole 53 is, for example, 70 μm (1 μm = 10 ^−6).
m), the interval S is 26 μm, and the depth H from the surface to the bottom is 33 μm. The frequency of the halftone dots of the resin plate 51 is 30%. Here, "dot" means
It refers to points of large or small size or the same size (surface holes 53) arranged regularly or regularly. The “frequency of halftone dots” is the area ratio between the surface area without halftone dots (surface holes 53) and the entire surface area on which the halftone dots are arranged. In other words, the “frequency of halftone dots” is “surface area of convex surface / (surface area of convex surface and concave surface)” = “surface area of convex surface /
It means "total surface area". As a result of preparing a trial product with the frequency of the halftone dots in the range of 20% to 70% and performing backlash, it was found that the case where the frequency of the halftone dots was 30% was the best. When the frequency of the halftone dots was in the range of 25% to 35%, almost satisfactory backlash was performed. The resin plate 51 may be a resin material made of only a resin or a resin impregnated material containing a resin. The resin may be a natural resin or a synthetic resin. Further, the resin may be called a resin, or may be called a plastic. Also,
The resin plate 51 contains a photosensitive substance, and the holes 53 can be formed by performing conventionally known exposure and development. The hardness of the resin plate 51 is preferably about 40 degrees. Since the hardness of the resin plate 51 is 40 degrees, the resin plate 51 has flexibility and elasticity. When the flexible and elastic surface is pressed against the screen, the ink is easily sucked into the hole 53 and easily enters. FIG. 2 is a view showing a case where the resin plate 51 is placed on the table 54 and backing is performed. The screen 55 is attached to a screen frame 56, and the ink 58 is left behind the screen 55. In this state, the resin plate 51 is placed on the table 54, and blank printing (printing without using ink) is performed by the squeegee 57.
Thus, the ink 5 remaining on the back side of the screen 55
8 enters the hole 53 of the resin plate 51 and the screen 55
Removed from Since the resin plate 51 has a flexible elasticity, the resin plate 51 is placed on the table 54 so as to be kept flat. The backing can be automated by loading and unloading the resin plate 51 with the table 54 in the same manner as the work. FIG. 3 shows a supporting plate 6 instead of the table 54.
1 is used. The support plate 61 is, for example,
It is a glass plate or a metal plate. By providing a device (not shown) for loading and unloading the resin plate 51 placed on the support plate 61, backlashing can be performed automatically. FIG. 4 shows a state in which the resin plate 51 is supported on a support screen 65.
FIG. As described above, since the resin plate 51 is flexible, some support material is required. FIG. 4 shows a case where a screen plate made of a support screen 65 and a screen frame 66 is used as the support material. By providing a device (not shown) for loading and unloading the screen plate making, the backing can be performed automatically. FIG. 5 shows a case where the backing is performed by applying pressure from under the resin plate 51 by the roller 59 utilizing the fact that the resin plate 51 is a flexible material. The resin plate 51 is supported by the support frame 67, but is supported to such an extent that the resin plate 51 can bend as shown in the figure. The roller 59 moves in the direction of the arrow X by rotating in the direction of the arrow R, so that the back of the screen 55 can be blown. Next, the backlash method of this embodiment will be described with reference to FIGS. In S10, screen printing is performed on the work. After performing screen printing, for example, as shown in S10 of FIG.
The ink 58 remains on the back side of No. 5. Next, backlash is performed in S11. For this backlash, first, S1
In 3, the resin plate 51 is carried under the screen 55. Next, in S14, the resin plate 51 is pressed against the back side of the screen 55. The method of this pressure welding is, for example,
The method as shown in FIGS. 2 to 5 can be used. By this pressure contact, the ink 58 enters the holes 53 of the resin plate 51 as shown in S14 of FIG. Resin plate 51
Is made of a flexible and resilient material, the surface of the resin plate 51 can adhere to the back side of the screen 55 like a suction cup. Therefore, the ink 58 is supplied to the holes 53.
Will get into it. As described above, since the resin plate 51 is a material having flexibility and elasticity, and the degree of halftone dots of the resin plate 51 is about 30% as described above,
The ink 58 will effectively enter the holes 53. Next, in S15, the resin plate 51 is peeled off from the screen 55. The peeling in S15 is automatically performed by passing through the squeegee. Alternatively, it is automatically performed by moving the roller. This peeling is based on the same principle as screen printing plate separation. As shown in S15 in FIG. 7, the ink 53 is peeled off from the screen 55 with the ink 58 still in the hole 53 of the resin plate 51. No ink 58 remains on the back side of the screen 55. Next, S
At 16, the resin plate 51 is carried out from below the screen 55. The above is the backlash work. Next, the resin plate 51 carried out in S21
Wash. As shown in S21 of FIG. 7, the resin plate 51 is immersed in the cleaning liquid 68. The cleaning liquid 68 is the same liquid solvent as the solvent of the ink 58 or a liquid solvent stronger than the solvent used for the ink 58. The cleaning in S21 is not limited to cleaning with a solvent, but may be performed by blowing other means such as blowing compressed air, blowing compressed water, sandblasting, or a combination thereof. Next, in S31, the resin plate 51 is dried. In S31 of FIG. 7, the resin plate 51 is dried using the fan 69. Further, drying may be performed by heating or heating in a drying chamber. Alternatively, it may be naturally dried. The washed and dried resin plate 51 is used again for backing. As long as the holes 53 of the resin plate 51 absorb the ink 58, the resin plate 51 is used repeatedly. Therefore, the resin plate 51 is not discarded by one-time backlash, and the cost of consumables can be significantly reduced. Embodiment 2 FIG. In the above-described embodiment, the case where the resin plate 51 is a flat plate having substantially the same size as the screen 55 has been described. In this embodiment, a case where the flat plate is continuous will be described. In addition,
A flat plate refers to a plate that is not limited to a two-dimensional plane but has a plate shape regardless of a drum shape, a roll shape, a tape shape, or the like, as described below. FIG. 8 shows a case where the resin plate 51 is wound around a roller 59 in a drum shape. The roller 59 moves in the direction of the arrow X by rotating in the direction of the arrow R. Roller 59 makes one rotation in the direction of arrow R (360 °
By rotating, the length L of the screen 55 can be backed. That is, assuming that the diameter of the roller 59 is E and the length of the screen 55 is L, E> (L ÷
The diameter E of the roller 59 is determined so that the relationship of 3.14) is satisfied. By doing so, it is possible to prevent the portion used once for backing the resin plate 51 from being pressed against the back surface of the screen 55 again during rotation. FIG. 9 shows a case where the resin plate 51 is moved in the direction of arrow Z by using two rollers 59. FIG. 10 shows a case where the resin plate 51 is moved in the direction of arrow Z by using three rollers 59 so that the backlash can be pointed. FIG. 11 shows a case in which the resin plate 51 is rolled, and the resin plate 51 is sequentially unwound from the roll and wound up to perform backing. In the case shown in FIGS. 8 to 11, the rollers 59 and the resin plate 51 are carried in and out of the screen 55 together. When the resin plate 51 is to be washed, the roller 59 and the resin plate 51 are washed and dried together.
That is, the resin plate 51 and the roller 59 are unitized. Embodiment 3 FIG. 12 shows a case where holes 53 having different diameters are arranged in the resin plate 51. Also,
The surface shape of the hole 53 need not be circular, and may be, for example, a square, a triangle, or a star. Also, hole 5
The shape of 3 need not be a cylinder, but may be a cone, a pyramid, a bowl, or the like. FIG. 13 shows a case where a bottomless hole, that is, a hole 73 is used instead of the bottom hole 53 of the resin plate 51. The hole 73 is a hole penetrating from the front to the back of the resin plate 51. In the case where the holes 73 are provided, a cleaning method can be employed in which the ink 58 that has entered the holes 73 is blown from the front and rear sides of the holes 73 with compressed air or compressed water to discharge the ink 58. FIG. 14 shows a resin plate 51 having a groove 74 instead of the hole 53. FIG. 15 shows a resin plate 51 having a groove 74 instead of the hole 53. The holes 53 and the holes 7 shown in FIGS.
3, grooves 74 show some examples of concave portions provided in the resin plate 51. By optimizing the shape, configuration, and ratio of the recess, the effect of backlash can be improved. As described above, according to the present invention, since the resin material is used as the backing material, it can be used as the backing material any number of times by washing the resin material. it can. Further, since a plurality of recesses are provided on the surface of the backing material, the ink remaining on the back side of the screen is introduced into the recesses, so that the screen can be effectively backwashed. . Further, since the backing material is formed of a flexible material, there is an effect that the backing material is easily adsorbed to the back side of the screen. Further, since it is a flexible material, it can be made into a roll shape, a drum shape or the like, and backing can be performed using various structures and mechanisms.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a resin plate 51 according to the first embodiment. FIG. 2 is a view showing an operation of backing with a squeegee 57 using a resin plate 51 supported on a table 54. FIG. 3 is a view showing an operation of backing with a squeegee 57 using a resin plate 51 supported by a support plate 61. FIG. 4 shows a resin plate 51 supported by a support screen 65.
The figure which shows the operation | movement of backlash by the squeegee 57 using. FIG. 5 is a diagram showing an operation of pressing a resin plate 51 supported by a support frame 67 by using a roller 59 to backlash the resin plate 51; FIG. 6 is a flowchart showing a screen backing method. FIG. 7 is an operation process diagram of the screen backlashing method. FIG. 8 is a diagram illustrating an operation of backing using one roller 59 according to the second embodiment. FIG. 9 is a diagram illustrating an operation of backlashing using two rollers 59 according to the second embodiment. FIG. 10 is a diagram illustrating an operation of backlash using three rollers 59 according to the second embodiment. FIG. 11 is a diagram illustrating an operation of backing the resin plate 51 of the second embodiment in a roll shape. FIG. 12 is a diagram showing a resin plate 51 having holes 53 having different diameters according to the third embodiment. FIG. 13 shows a resin plate 51 having a hole 73 according to the third embodiment.
FIG. FIG. 14 shows a resin plate 51 having a groove 74 according to the third embodiment.
FIG. FIG. 15 shows a resin plate 51 having a groove 74 according to the third embodiment.
FIG. [Description of Signs] 51 resin plate, 53 holes, 54 table, 55 screen, 56 screen frame, 57 squeegee, 58
Ink, 59 rollers, 61 support plate, 65 support screen, 66 screen frame, 67 support frame, 68 cleaning liquid, 69 fan, 73 holes, 74 grooves, D diameter, S
Interval, H depth.

Claims (1)

(57) [Claims] [Claim 1] In a screen backing method for backing a screen used for screen printing with a backing material, the backing material is a resin material, The resin material is a flat plate having a plurality of recesses on the surface, the resin material is a photosensitive resin plate, and the plurality of recesses are holes formed by exposing and developing the photosensitive resin plate. There is a screen backlash method.