JP2004074811A - System and method for back cleaning of screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform back cleaning of a screen by using a back cleaning material which can be used repeatedly. <P>SOLUTION: A resin plate 51 having holes 53 is used as the back cleaning material for the screen. The holes 53 are formed by subjecting the resin plate 51 to exposure and development. By bringing the resin plate 51 into pressure contact with the back side of the screen, the ink left on the back side of the screen is made to get in the holes 53 and thereby the screen can be cleaned. The resin plate 51 can be used any number of times repeatedly by washing and drying it. <P>COPYRIGHT: (C)2004,JPO

Description

{Circle around (2)} The present invention relates to 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.

ス ク リ ー ン After performing screen printing on a work (substrate), ink may be left on the back side of the screen or ink may bleed out, so it is necessary to clean the back of the screen before printing on the next work. 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.

(4) When humans manually screen the screen back, it takes time and labor, and there is a problem that screen printing cannot be automated.

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.

The present invention has been made to solve the above-described problem, and has an object to make it possible to reuse a backing material for backing a screen.

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 backing material is a resin material.

樹脂 The resin material is a flat plate having a plurality of concave portions 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.

In the screen backing method of backing the screen used for screen printing with backing material,
The backing material is a flat plate having a plurality of concave portions on the surface.

平板 The flat plate is formed of a resin material.

The flat plate is formed of a flexible material.

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 method further comprises a step of back-pressing a backing material having a plurality of recesses on its surface against the back side of the screen to fill the plurality of recesses with ink.

The screen backlash method is
After the backing process, washing the backing material and removing ink from the backing material,
After the step of taking ink, there is provided a recycling step for using the backing material in the step of backing again.

The screen backlash method is
After the step of taking ink, a step of drying the backing material is provided.

The screen backlash method is
The method includes a step of forming the backing material from a resin material.

As described above, according to the present invention, since the resin material is used as the backing material, the resin material can be used as the backing material any number of times by washing the resin material.

Also, 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 allowed to enter the recesses, so that the screen can be effectively backwashed.

Since the backing material is made of a flexible material, there is an effect that the backing material is easily adsorbed to the back side of the screen.

Because it is a flexible material, it can be rolled, drum-shaped, or back-foiled using various configurations and mechanisms.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a resin plate 51 of the present embodiment and a partially enlarged 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, the "halftone dot" refers to regularly or regularly arranged points of large or small or the same size (surface holes 53). The “frequency of a halftone dot” 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" means "surface area of convex surface / (surface area of convex surface and concave surface)" = "surface area of convex surface / total surface area" shown in FIG. As a result of making a trial product in which the frequency of the halftone dot is between 20% and 70% and performing backlash, it was found that the case where the frequency of the halftone dot 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. Further, the resin plate 51 contains a photosensitive substance, and the holes 53 can be formed by performing exposure and development which are conventionally known. 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 diagram 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 58 remaining on the back side of the screen 55 enters the hole 53 of the resin plate 51 and is removed from the screen 55. 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.

(4) The backing can be automated by carrying the resin plate 51 in and out of the table 54 in the same manner as the work.

FIG. 3 shows a case where a support plate 61 is used instead of the table 54. The support plate 61 is, for example, 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 case where the resin plate 51 is fixed to the support screen 65. 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 backing is performed by applying pressure from below the resin plate 51 by the roller 59 using 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 the screen printing, for example, as shown in S10 of FIG. 7, the ink 58 remains on the back side of the screen 55.

Next, in S11, backlash is performed.

の た め For this backlash, first, in S13, 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. As a method of this pressure welding, for example, a 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. Since the 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 enters the hole 53. As described above, since the resin plate 51 is a material having flexibility and elasticity, and the degree of the halftone dots of the resin plate 51 is about 30% as described above, the ink 58 is effectively inserted into the holes 53. You will get in.

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.

(7) As shown in S15 of FIG. 7, the ink 53 is peeled off from the screen 55 while the ink 58 enters the hole 53 of the resin plate 51. No ink 58 remains on the back side of the screen 55.

Next, in S16, the resin plate 51 is carried out from below the screen 55.

Above is the backlash work.

Next, the resin plate 51 carried out in S21 is washed. 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 step S21 is not limited to cleaning with a solvent, but may be performed by blowing compressed air, blowing compressed water, sandblasting, or any other cleaning method using 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.

(4) 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.

平板 In addition, a flat plate refers to a plate-shaped member other than a two-dimensional plate, irrespective 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 the 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. The length of the screen 55 can be backed off by one rotation (360 ° rotation) of the roller 59 in the direction of arrow R. That is, assuming that the diameter of the roller 59 is E and the length of the screen 55 is L, the diameter E of the roller 59 is determined such that the relationship of E> (L ÷ 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 arrow Z direction using two rollers 59.

FIG. 10 shows a case where three rollers 59 are used to move the resin plate 51 in the direction of the arrow Z to indicate backlash.

FIG. 11 shows a case in which the resin plate 51 is formed into a roll shape, and the resin plate 51 is sequentially unwound from the roll shape and wound up to perform backing.

(8) In the case shown in FIGS. 8 to 11, the rollers 59 and the resin plate 51 are carried in / 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.
FIG. 12 shows a case where holes 53 having different diameters are arranged in the resin plate 51. Further, the surface shape of the hole 53 need not be circular, and may be, for example, a square, a triangle, or a star.

The shape of the hole 53 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, the holes 73, and the grooves 74 shown in FIGS. 12 to 15 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.

FIG. 3 is a diagram showing a resin plate 51 according to the first embodiment. The figure which shows the operation | movement of backing with the squeegee 57 using the resin board 51 supported by the table 54. The figure which shows the operation | movement of backing with the squeegee 57 using the resin plate 51 supported by the support plate 61. The figure which shows the backing operation | movement by the squeegee 57 using the resin plate 51 supported by the support screen 65. FIG. The figure which shows the operation | movement which press-contacts the resin plate 51 supported by the support frame 67 with the roller 59, and reverses. The flowchart figure which shows a screen backlashing method. FIG. 4 is an operation process diagram of the screen backlashing method. The figure which shows the operation | movement of backing using one roller 59 of Embodiment 2. FIG. The figure which shows the backlashing operation | movement using two rollers 59 of Embodiment 2. FIG. 14 is a diagram illustrating an operation of backlashing using three rollers 59 according to the second embodiment. The figure which shows the operation | movement which makes the resin plate 51 of Embodiment 2 into a roll shape, and reverses. The figure which shows the resin plate 51 which has the hole 53 from which diameter differs in Embodiment 3. FIG. The figure which shows the resin plate 51 which has the hole 73 of Embodiment 3. The figure which shows the resin plate 51 which has the groove 74 of Embodiment 3. The figure which shows the resin plate 51 which has the groove 74 of Embodiment 3.

Explanation of reference numerals

51 resin plate, 53 hole, 54 table, 55 screen, 56 screen frame, 57 、 squeegee, 58 ink, 59 roller, 61 support plate, 65 support screen, 66 screen frame, 67 support frame, 68 cleaning solution, 69 fan, 73 hole , 74 groove, D diameter, S spacing, H depth.

Claims (10)

In the screen backing method of backing the screen used for screen printing with backing material,
The screen backing method, wherein the backing material is a flat plate having a plurality of uneven portions on the surface, and the surface area of the convex surface is 25% to 35% of the total surface area. ス ク リ ー ン The screen backing method according to claim 1, wherein the flat plate is formed of a resin material. ス ク リ ー ン The screen backing method according to claim 1, wherein the flat plate is formed of a flexible material. In a screen backing method of backing a screen used for screen printing with a backing material,
The method is characterized in that a backing material having a plurality of recesses on the surface is pressed against the back side of the screen from under the backing material by a roller and ink is applied to the plurality of recesses to perform backing. Screen backlash method. The screen backlash method is
After the backing process, washing the backing material and removing ink from the backing material,
5. The method according to claim 4, further comprising, after the step of removing the ink, a reuse step of performing the step of backing the backing material again. The screen backlash method is
The method of claim 5, further comprising the step of drying the backing material after the step of taking the ink. The screen backlash method is
5. The method according to claim 4, further comprising the step of forming the backing material from a resin material. In the screen backing method of backing the screen used for screen printing with backing material,
The screen backing method, wherein the backing material is a resin plate having a hardness of about 40 degrees. In the screen backing method of backing the screen used for screen printing with backing material,
The screen backing method, wherein the backing material is a flat plate having a plurality of concave portions having different surface shapes on the surface. In the screen backing method of backing the screen used for screen printing with backing material,
The screen backing method, wherein the backing material is a flat plate having a plurality of holes on a surface.

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