TWI701151B - Screen printing device, screen printing plate, manufacturing method of screen printing plate, and manufacturing method of substrate with printing layer - Google Patents

Abstract

The subject of the present invention is to provide a screen printing device, a screen printing plate, and a method for manufacturing a screen printing plate that can achieve high-precision printing with less bleeding even if the gap between the substrate and the screen printing plate is increased , And manufacturing method of substrate with printing layer. The screen printing device 100 of the present invention presses the squeegee 17 against the screen printing plate 21 to form a printing layer with a desired printing pattern on the printed surface 15 of the substrate 13 having a curved shape. The screen 27 is arranged on the printed surface 15 with a gap therebetween. A correction printing pattern is formed on the screen 27, and the correction printing pattern is in a manner consistent with the desired printing pattern as a target. When the screen 27 is pressed down by the squeegee 17 and scanned in the printing direction , The printing pattern offset caused by elastic deformation in the printing direction of the printing layer, the width direction of the squeegee 17 crossing the printing direction, and the height direction of the printed surface 15 orthogonal to the printing direction and the width direction are corrected .

Description

Screen printing device, screen printing plate, manufacturing method of screen printing plate, and manufacturing method of substrate with printing layer

The invention relates to a screen printing device, a screen printing plate, a method of manufacturing a screen printing plate, and a method of manufacturing a substrate with a printing layer.

In a screen printing device, a screen printing plate having a printing pattern of the same shape as the pattern to be printed is generally designed. That is, a screen plate having a desired printing pattern is used on the surface to be printed, and the screen plate is pressed with a squeegee to perform printing. When the screen printing is applied to decorative printing for displays, etc., high dimensional accuracy is required. In addition, it is also required to reduce bleeding at the interface between the printing part and the non-printing part.

If it is pressed with a squeegee, the screen will be stretched and bent, and the printed pattern will be deformed. Although the deformation is relatively small, it appears as a deviation of the printed material during transfer, which hinders high-precision printing. In addition, in recent years, there has been a demand for printing on substrates with curved surfaces (see Patent Document 1, etc.). Especially in the printing of concave curved surfaces, the greater the depth of the concave surface, the greater the gap between the printed surface of the substrate and the screen printing plate. The more the distance between the printed surface and the plate surface is enlarged, the linearity between the printed part and the non-printed part will be lost due to the stretch of the screen during printing, which will cause the desired pattern to be deformed. As a result, even if it is printed on the concave surface, it becomes a shape different from the pattern to be printed, which causes a problem that the desired printing cannot be achieved.

[Prior Technical Literature] [Patent Literature]

[Patent Document 1] Specification of US Patent No. 8561535

The purpose of the present invention is to provide a screen printing device, a screen printing plate, and a method for manufacturing a screen printing plate that can achieve high-precision printing with less bleeding even if the gap between the substrate and the screen printing plate is enlarged. And the manufacturing method of substrate with printing layer.

The present invention includes the following configurations.

(1) A screen printing device characterized in that it uses a squeegee to press a screen printing plate with an elastically deformable screen onto the printed surface of a substrate with a curved shape to form the desired printing The printing layer of the pattern, and the screen is arranged on the printed surface of the substrate with a gap; the screen is formed with a correction printing pattern, and the correction printing pattern is the same as the desired printing In a consistent pattern, when the screen is pressed down on the squeegee and scanned in the printing direction, in the printing direction of the printing layer, the width direction of the squeegee arranged across the printing direction, and The deviation of the printing pattern caused by elastic deformation in the height direction of the printed surface perpendicular to the printing direction and the width direction is corrected.

(2) A screen printing plate, characterized in that it is used to fix the screen edge of an elastically deformable screen to a frame and to perform screen printing on a substrate with a curved shape, and the above The screen has: a low-density portion that allows the printing material to pass through; and a high-density portion that restricts the passage of the printing material; and the low-density portion is arranged adjacent to the high-density portion, and is connected to the high-density portion At least a part of the boundary line is a curve.

(3) A method for manufacturing a screen printing plate, characterized in that: the edge of the screen of the elastically deformable screen is fixed to the frame, and the squeegee is pressed against the screen to form a curved surface. The printed surface of the substrate forms the printed layer of the desired printing pattern, and includes the following steps: obtaining a corrected printing pattern that is consistent with the desired printing pattern as the target The screen is generated due to elastic deformation in the printing direction of the printing layer, the width direction of the squeegee intersecting the printing direction, and the height direction of the printed surface orthogonal to the printing direction and the width direction Correcting the offset of the printed pattern; and forming the obtained corrected printed pattern on the screen.

(4) A method for manufacturing a substrate with a curved shape with a printing layer, characterized in that it uses a squeegee to press a screen printing plate with an elastically deformable screen onto the substrate with a curved shape The printed surface forms the printed layer of the desired printing pattern, and the above-mentioned screen has a corrected printing pattern, and the corrected printing pattern is applied to the above-mentioned screen in a manner consistent with the target desired printing pattern When the squeegee presses down the screen and sweeps in the printing direction, the printing direction of the printing layer, the width direction of the squeegee intersecting the printing direction, and the direction orthogonal to the printing direction and the width direction The deviation of the print pattern caused by elastic deformation in the height direction of the printed surface is corrected.

According to the present invention, even if the gap between the printed surface of the substrate and the screen printing plate is enlarged, printing with high precision and less bleeding can be achieved.

13: Substrate

15: The printed side

17: Scraper

19: Pedestal

19a: pedestal surface

19b: groove

20: hole

21: Screen printing plate

23: Scraper drive

25: Front end of scraper

27: wire mesh

29: Frame

31: Correct the printed pattern

33: Low density part

35: High density part

37: correction line

38: correction line

39: Printed image

39a: Printed image

41: Correct the printed pattern

43: Uncorrected printed image

100: Screen printing device

110: Screen printing device

351: The first high density part

352: The second high density part

A-A: line

A: point

B: point

B: width

f _L : the width of the screen, the length from the left frame 29 to the end of the scraper

f _r : the width of the screen, the length from the right frame 29 to the end of the scraper

h: gap

h ₁ : gap

h ₂ : gap

i: indicator

j: indicator

L: screen width

L _H : wire mesh center line

L _V : wire mesh center line

M(X,Y): coordinates

N(x,y): coordinates

P ₀ : Reference position

P(i,j): target printing pattern

P _x : point

P _xa : point

Q: point

Q(i,j): enlarged printing pattern

r ₁ : correction amount

r ₂ : correction amount

R(i,j): Correct the printed pattern

W: screen width

X: direction

Y: direction

ε ₁ : offset

ε ₂ : Offset

Fig. 1 is a schematic configuration diagram of a screen printing apparatus of the first configuration example of the present invention.

Figure 2 (A) is a top view of the screen printing plate, and (B) is a cross-sectional view of A-A of (A).

Fig. 3 is a top view of a screen with correction printing patterns formed.

FIG. 4 is a top view showing the rectangular printed image printed by the screen printing shown in FIG. 3. FIG.

Figure 5 is a top view showing a substrate on which a printed image is formed.

Figure 6 is a schematic diagram illustrating the offset of the printing direction.

Fig. 7 is a schematic diagram illustrating the offset in the direction orthogonal to the printing direction.

FIG. 8 is a schematic diagram for explaining the sequence of determining the coordinates of the corrected printing pattern from the coordinates on the substrate with the printing layer to be produced.

Fig. 9 (A) is a schematic diagram of a desired printing pattern set as a target, (B) is a schematic diagram of a printed image of deformation printing, and (C) is a schematic diagram of a corrected printing pattern.

Fig. 10 is a top view showing the corrected printing pattern including the peripheral correction of the printed image.

Fig. 11 is a top view showing the correction printing pattern including the correction of the outer periphery and the inner periphery of the printed image.

Fig. 12 is a schematic diagram showing the screen printing status of the screen printing device of the second configuration example.

FIG. 13 is a plan view schematically showing the correction printing pattern of the screen printing device shown in FIG. 12.

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

<First configuration example>

Fig. 1 is a schematic configuration diagram of the screen printing apparatus of the present invention.

The screen printing device 100 forms a printing layer of a desired printing pattern on the printed surface 15 of the base material 13 having a curved shape. The screen printing apparatus 100 has a squeegee 17, a base 19, a screen printing plate 21, and a squeegee driving unit 23.

The screen printing plate 21 is arranged on the pedestal 19 and formed between the printed surface 15 of the substrate 13 Specific gap. The squeegee 17 is arranged above the screen printing plate 21 such that the front end portion 25 of the squeegee can press the screen 27. The squeegee driving portion 23 presses the squeegee front end 25 toward the screen 27, and while slidingly contacting the screen 27, the squeegee 17 moves in the printing direction indicated by the arrow in the figure. The screen 27 is pressed by the front end portion 25 of the squeegee, and protrudes downward and abuts against the printed surface 15 of the substrate 13. Thereby, the printing material placed on the screen is transferred to the printed surface 15 so that the printing pattern of the screen 27 is printed on the printed surface 15. The squeegee 17 of this structure is arranged orthogonally to the printing direction, but it may be arranged to cross other than the right angle.

As the material of the base 19, a softer material than the base material 13, such as carbon or resin, can be used. As the resin, for example, BAKELITE (registered trademark), PEEK (registered trademark), vinyl chloride, DURACON (registered trademark), etc. can be used. These resins may also be subjected to surface treatments such as conductive films or the like for imparting conductivity, or mixing of carbon and the like. In addition, the pedestal 19 has a downwardly curved pedestal surface 19a that is substantially the same shape as the printed surface 15 of the substrate 13. In addition, the pedestal 19 is recessed from the pedestal surface 19a to form a groove 19b for accommodating the base material 13. In the state where the substrate 13 is accommodated in the groove 19b, the printed surface 15 slightly protrudes from the pedestal surface 19a.

The volume resistivity of the pedestal 19 (at least the surface) is preferably 10 ⁹ Ωm or less, more preferably 10 ⁷ Ωm to 10 ⁸ Ωm. Thereby, static electricity generated during printing is suppressed, and the release of the screen 27 from the printed surface 15 is improved, and the separation of the printing material is improved, and the printing accuracy can be improved without staining the plate. In addition, since static electricity can be reduced, foreign matter such as dust will not be attracted, and a good printing layer can be formed.

In addition, the fixing system of the base material 13 to the pedestal 19 is not limited to a method in which a groove 19b having the same shape as the base material 13 is provided on the pedestal 10 and embedded in the groove 19b. For example, although the illustration is omitted, the following method may also be adopted: the surface of the base 19 is opened to suck in a plurality of holes of the external air connected to the vacuum device, so that the substrate 13 is vacuum-adsorbed. In addition, a plurality of holes 20 for suction may be provided in the groove 19b.

Fig. 2(A) is a plan view of the screen printing plate, and Fig. 2(B) is a cross-sectional view of A-A of (A).

The screen printing plate 21 fixes the screen edge of the elastically deformable rectangular screen 27 to a rectangular resin frame 29 with an adhesive or the like. The screen 27 is made of resin materials such as Tedron, nylon, and polyester, or metal materials such as stainless steel.

In this structure, since printing is performed on the substrate 13 having a curved surface shape shown in FIG. 1, the screen 27 must be pressed in with the squeegee 17. That is, compared with a generally flat screen printing plate, the interval between the screen 27 and the printed surface 15 must be increased by the amount of the bending depth (maximum height difference) of the substrate 13. Therefore, as the material of the screen 27, it is preferable to use nylon with higher stretchability.

In addition, the minimum clearance between the screen 27 and the printed surface 15 is preferably 1 mm or more, more preferably 2 mm or more. In addition, the maximum gap is preferably 15 mm or less, more preferably 10 mm or less. If it is the said range, the screen 27 can be press-fitted to the to-be-printed surface 15 reliably, and a good release is obtained.

Figure 3 is a top view of the screen.

On the screen 27 installed on the screen printing plate 21, a correction printing pattern 31 corresponding to the printing image is formed as shown in the figure. Generally speaking, when the printing pattern of the screen printing plate 21 is pressed down by the squeegee 17 to the printed surface 15 and scanned in the printing direction, the screen 27 elastically deforms in the printing direction and the width direction orthogonal to the printing direction . The printing position shifts due to this elastic deformation. Therefore, the correction printing pattern 31 formed on the screen 27 is corrected in a manner consistent with the desired printing pattern as the target according to the generated offset amount. The screen printing plate 21 is produced based on a design method of uniquely determining the correction printing pattern of the correction printing pattern 31 based on the preset positional relationship between the base material 13 and the screen 27.

The correction printing pattern 31 has: a low-density portion 33 which allows the printing material to pass through; and a high-density portion 35 which restricts the passage of the printing material. The low-density portion 33 and the high-density portion 35 are arranged adjacent to each other. In the correction printing pattern 31, at least a part of the boundary line between the low density portion 33 and the high density portion 35 is formed as a correction line 37. The screen printing plate 21 of this configuration example has a pattern in which the printed image on the printed surface 15 of the substrate 13 becomes a rectangular frame, and the correction line 37 is a curved line. The "curve" mentioned here can also be the shape of the desired curve by connecting short line segments. The length of the short line segment is preferably 300 mm or less, more preferably 50 mm or less, and still more preferably 10 mm or less. The correction line 37 is formed by connecting the line segments in the range and approximating it to a curve, and the printing accuracy of the same level as the desired curve can be obtained, and the manufacturing cost of the screen printing plate 21 can be suppressed. In addition, the lower limit is not particularly limited.

4 is a plan view showing a rectangular printed image printed with the screen 27 of the correction printing pattern 31 shown in FIG. 3. In addition, the dotted line in the figure indicates the outer periphery of the base material 13, on which the printed image 39 corresponding to the low-density part 33 of the screen 27 is formed. In this case, the low-density portion 33 of the screen 27 extends more outward than the outer periphery of the base 13, and a printed image 39 is also formed on the outer periphery of the base 13. However, since the printed image 39 outside the outer periphery of the substrate 13 is transferred to the pedestal 19, a rectangular printed image 39a is formed on the substrate 13 as shown in FIG. However, the substrate 13 protrudes by about 100 to 300 μm relative to the surface 19a of the pedestal, so the printing material of the printed image 39 will not adhere to the pedestal and will not contaminate the substrate.

The screen 27 of the above-mentioned screen printing plate 21 is formed by surrounding the high-density portion 35 with the low-density portion 33 as shown in FIG. 3. In addition, the screen printing plate 21 has two symmetry axes of the screen 27 with respect to the screen center line L _V in the X direction and the screen center line L _{H in} the Y direction. The screen printing plate 21 used in the screen printing device 100 of the present configuration is not limited to the above example, and the symmetry axis may be one or two or more. In addition, it may be a case where there is no axis of symmetry.

As a method of forming the correction printing pattern on the screen 27, a well-known technique such as etching including mask processing using a photoresist can be used.

<Design method for correcting printing patterns>

Next, a design method of the correction printing pattern 31 of the screen printing plate 21 will be described.

(Basic concept of correction processing)

(A) Regarding the offset of the printing direction

Figure 6 is a schematic diagram illustrating the offset of the printing direction.

When the screen 27 is pressed by the squeegee 17, the position where the P _x point on the screen 27 is printed on the printed surface 15 is not directly below the P _x point Q, but shifts to the P _xa point. The offset between the Q point and the P _xa point is smaller as it approaches the center of the screen 27 in the printing direction, that is, the reference position P _0. Furthermore, the shorter the gap h between the screen 27 and the substrate 13 is, the smaller. Formula (1) expresses the offset of the printed image.

[Number 1] ε ₁ =△ left -△ right ‧‧‧(1)

△left is the stretch (AQ-AP _x ) of the screen 27 on the printing upstream side of the squeegee 17 (the left side of FIG. 6). △right is the stretch (BQ-BP _x ) of the screen 27 on the printing downstream side of the squeegee 17 (the right side of FIG. 6). The printing pattern on the upstream side of printing is shifted from the reference position P ₀ of the center of the screen 27 toward the printing upstream side, and the printing pattern on the printing downstream side is shifted toward the printing downstream side from the reference position P ₀ . In addition, the closer to the frame 29 indicated by points A and B in the figure, the greater the offset ε _{1 of} the printed image 39.

(B) About the deviation of the width of the scraper

Fig. 7 is a schematic diagram illustrating the offset in the direction orthogonal to the printing direction.

When the screen 27 is pressed by the squeegee 17, the screen 27 also expands in the width direction (Y direction) of the squeegee. The same as the case of the offset in the printing direction (X direction), based on the stretch amount of the part up to the left frame 29 in the figure and the stretch amount of the part up to the right frame 29 in the figure, it can be calculated by formula (2) The offset ε ₂ .

[Number 2] ε ₂ =△ left -△ right ‧‧‧(2)

In addition, if the center of the width direction of the squeegee 17 is set as the reference position P _{0 for the} printed image 39, the printed pattern up to the left frame 29 in the figure is shifted toward the left frame 29 from the reference position P ₀ . The printed patterns up to the right frame 29 are offset from the reference position P ₀ toward the right frame 29. In addition, the closer to each frame 29, the greater the offset ε _{2 of} the printed image 39.

According to the above relationship, the offset of any position on the screen can be calculated geometrically. As a method of geometrically finding the corrected print pattern 31, for example, finding the offset direction and offset amount of each position of the desired print pattern set as a target, and returning the offset direction to the same The offset point is treated as a correction point, etc.

Therefore, the correction line 37 of the interface between the low-density portion 33 and the high-density portion 35 is determined according to the substrate with the printed layer to be produced. For example, as shown in FIG. 8, when the printed image 39a is printed on the printed surface 15 of the substrate 13, the coordinates M (X, Y) of the inner periphery of the printed image 39a are set to a flat silk The coordinates of the net 27 are N(x,y).

Specifically, the correction printing pattern (x, y) 31 of the screen 27 is obtained by correcting the above-mentioned offset amounts ε ₁ and ε ₂ by formulas (3) and (4).

[Number 3] x = X + ε ₁ ‧‧‧(3) y = Y + ε ₂ ‧‧‧(4)

Here, X and Y are the coordinates on the printed surface 15 of the curved shape of the substrate 13. The offsets ε ₁ and ε _{2 of} equations (3) and (4) can be calculated as follows.

First, with regard to the offset ε ₁ , Δleft in (1) can be obtained by equation (5), and Δright can be obtained by equation (6).

According to equations (5) and (6), the offset ε ₁ can be expressed by equation (7).

That is, the offset ε ₁ can be approximately obtained from the X coordinate of M, the gap h, and the screen width L.

Next, consider the offset ε ₂ . First of all, the elongation k of the screen plate can be obtained by formula (8).

Wa is the length of the screen in the y direction (the direction orthogonal to the printing direction) when the squeegee is pressed in, B is the width of the squeegee 17 in the direction orthogonal to the printing direction, f _L is the left frame of Figure 7 The length from 29 to the end of the scraper. f _r is the length from the right side frame 29 to the end of the scraper in FIG. 7.

The △left of (2) can be obtained by (9), and △right can be obtained by (10).

[Number 7]△ left = Y (1-1/ k )‧‧‧(9) △ right =( W - Y )(1-1/ k ) (10)

Therefore, the offset ε ₂ can be obtained from the formula (11).

[Number 8] ε ₂ = (2 Y - W )(1-1/ k )‧‧‧(11)

That is, the offset ε ₂ M Y coordinate system by the gap H, the screen width W, f _L, f _r and may be approximately determined.

The correction printing pattern 31 corrected using the aforementioned offsets ε ₁ and ε _{2 is} formed into a pattern different from the desired printing pattern. Fig. 9 (A) is a schematic diagram of a desired printing pattern set as a target, (B) is a schematic diagram of a printed image 39 of deformation printing, and (C) is a schematic diagram of a corrected printing pattern.

The printing pattern P(i, j) formed on the screen 27 shown in FIG. 9(A) stretches and deviates due to the pressing force from the squeegee 17 and the reaction force from the frame 29 when it is pressed down. As a result, the actual printed image 39 is transformed into the enlarged printed pattern Q(i,j) shown in FIG. 9(B) compared to the desired desired printed pattern formed on the screen 27. Therefore, the target printing pattern P(i,j) shown in FIG. 9(A) is converted according to the above-mentioned offset ε ₁ , ε ₂ to form the corrected printing pattern R(i, j) shown in FIG. 9(C) ). Here, i and j are indicators indicating the position on the silk screen.

In addition, the screen 27 is not limited to the correction printing pattern 31 shown in FIG. 3, and may be one that forms the outer periphery of the printed image by the correction printing pattern. In this case, as shown in FIG. 10, the outer edge shape of the low-density portion 33 is set to a correction line 38 that is corrected in the same manner as the correction line 37. Thereby, a rectangular printed image is formed on the printed surface 15 of the substrate 13 using the correction lines 37 and 38.

Furthermore, the screen 27 is shown in FIG. 11, and the high-density portion 35 may also have a first high-density portion 351 and a second high-density portion 352. In this case, the low-density portion 33 is preferably formed on the outer peripheral edge of the first high-density portion 351 like the high-density portion 35 in FIG. 3. By setting the boundary between the low-density portion 33 and the first high-density portion 351 as the correction line 37, the printing accuracy of the boundary line near the center of the substrate in the frame-shaped printed layer can be improved.

In addition, the low-density portion 33 is preferably formed with a second high-density portion on its outer peripheral edge as shown in FIG. 度部352. By setting the boundary between the low-density portion 33 and the second high-density portion 352 as the correction line 38, the printing accuracy of the boundary line on the side away from the center of the substrate in the frame-shaped printed layer can be improved.

Next, the effect of the above configuration will be explained.

According to the screen printing apparatus 100 of the present configuration and the screen printing method using the same, when the screen 27 is pressed toward the substrate 13 side, there is no deviation of the printed pattern, and the reduction in printing accuracy is suppressed. That is, the screen 27 is fixed by the frame 29 to the edge of the screen, and when pressed down, it stretches due to the pressing force from the squeegee 17 and the reaction force from the frame 29, and faces the vicinity of the frame 29. The side of the frame is offset.

As a result, compared to the printed pattern formed on the screen 27, the actual non-corrected printed image 43 (refer to FIG. 9(B)) is shifted and deformed in the direction of enlargement (wherein, the friction caused by the friction with the squeegee 17 is ignored The expansion and contraction of the screen 27, or the tension change of the screen 27, etc.). The offset is the closer to the center of the screen 27 in the printing direction, that is, the reference position P ₀ (refer to FIGS. 6 and 7), that is, the more away from the frame 29, the smaller the gap between the screen 27 and the substrate 13 becomes. small. This phenomenon is also the same in the direction orthogonal to the printing direction.

These offsets can be calculated geometrically by the above calculation formula. Correction is applied to the printed pattern based on the calculated geometric conditions (the offset line of the correction point set). That is, the corrected printed pattern 31 is formed to reduce the shape of the printed pattern in such a way as to offset the generated offset. The screen printing apparatus 100 performs printing using the corrected printing pattern 31, and can form a printed image 39 that matches a desired printing pattern as a target.

In addition, in the screen printing apparatus 100, the printing material passes through the low-density portion 33 and is restricted from passing through the high-density portion 35. That is, the boundary line between the low-density portion 33 and the high-density portion 35 forms the contour line of the printed image 39. The screen printing apparatus 100 forms the correction printing pattern 31 by using at least a part of the boundary line as the correction line 37, so that the deformation caused by the stretching can be corrected.

In the screen printing device 100, it is particularly suitable for printing that requires the printing accuracy of the frame-shaped part surrounding the central part. For example, decoration printing for display applications is used for various decorative printing. It is also possible to perform printing with high accuracy with the desired printing pattern of the target.

According to the screen printing device 100 with the above configuration, compared to the method of measuring the offset amount based on the result of screen printing and producing the screen plate based on the offset amount, the manufacturing cost of the screen plate can be reduced, and the plate manufacturing can be shortened. period. That is, as long as the screen 27 of this configuration determines the shape of the base 13 and the positional relationship between the base 13 and the screen printing plate 21, the correction printing pattern 31 can be uniquely determined. Therefore, there is no need to perform trial production of the screen printing plate 21 which is complicated and time-consuming. For example, in the case of newly constructing a production line, or when switching the production line of an existing production line, as long as the position relationship between the shape of the base material 13 and the screen printing plate 21 is determined, the details of other production lines can be determined before Determine the specifications of the screen printing plate 21. Therefore, the screen printing plate 21 can be produced at an early stage, and a desired substrate production line can be constructed in a short time and at low cost.

<The second configuration example>

Next, a description will be given of a configuration example in which the substrate supported on the pedestal is inclined to further optimize the release.

Fig. 12 is a schematic diagram showing a situation where screen printing is performed on an inclined printed surface having a curved shape.

In the screen printing apparatus 110 of this configuration, the base 19 supports the substrate 13 in a posture with the gap between the screen 27 at the start of printing and the printed surface 15 of the substrate 13 as the largest. As a structure for tilting and supporting the base material 13, a pedestal 19 with an inclined upper surface can be used, but in addition to this, the pedestal 19 may be fixed to a pedestal bracket (illustration omitted) via a plurality of adjusters (illustration omitted). On the structure and so on. In this case, the pedestal 19 is set to shorten the length of the regulator on the upstream side in the printing direction and increase the length of the regulator on the downstream side in the printing direction. Thereby, the substrate 13 can be supported in a posture with the maximum gap at the start of printing.

In the screen printing apparatus 110 with the above-mentioned structure, the substrate 13 is arranged facing the screen 27 by the base 19, and the gap between the screen 27 and the printed surface 15 of the substrate 13 is the gap on the upstream side in the printing direction h ₁ is wider than the gap h ₂ on the downstream side.

That is, the pedestal 19 supports the substrate 13 in a posture that maximizes the gap between the screen 27 at the start of printing and the substrate 13. The screen 27 and the printed surface 15 of the substrate 13 gradually approach toward the downstream side in the printing direction, and the gap h _{1 is} inclined upward toward the decrease of h ₂ .

Generally speaking, when the screen 27 is parallel to the printed surface 15, the angle between the screen 27 pressed down by the squeegee 17 and the printed surface 15 at the printing start position is the upstream side of the printing direction Larger than the downstream side in the printing direction. Thereby, the screen 27 can be released well. However, at the end of printing, the angle between the screen 27 and the printed surface 15 is smaller in the upstream side in the printing direction than in the downstream side in the printing direction. That is, the angle between the screen 27 and the printed surface 15 is reversed at the beginning and the end of printing. Therefore, it is difficult to obtain a good release on the downstream side in the printing direction.

Therefore, the pedestal 19 of the present structure is such that the angle between the screen 27 and the printed surface 15 on the upstream side in the printing direction at the end of printing is greater than the downstream side in the printing direction, so that the printed surface 15 is inclined to support the base.材13.

The screen 27 has a manufacturing parameter called "yarn tension strength". The tension strength of the yarn is defined as the "indentation amount" when a certain predetermined load is applied to the center of the screen 27 after the yarn (screen) is stretched. The indentation amount can be used with a tension meter (PROTEC company, model STG-75M) Determination. If the yarn tension is strong, the pressing amount is smaller, and if the yarn tension strength is weak, the pressing amount is larger.

The inventors found that the yarn tension strength is a particularly important element in the screen printing quality of curved substrates. The pressing amount of the screen 27 is preferably 1 mm or more and 4 mm or less, more preferably 1.15 mm or more and 3 mm or less. If the press-in amount of the screen 27 is in this range, the release is better and a high-definition printing layer can be formed.

The size of the screen 27 here is 600~1000mm on the long side and 400~ on the short side. 800mm. It can be considered that in the case of using a smaller screen 27, the indentation amount smaller than the above range is preferable, and in the case of using a larger screen 27, the indentation amount greater than the above range is preferable.

FIG. 13 is a plan view schematically showing the correction printing pattern used in the situation shown in FIG. 12.

Since the correction printing pattern 41 of the screen printing plate 21 is more pressed into the squeegee 17 at the beginning of printing, the correction amount r _{1 is} large, and the correction amount r ₂ gradually decreases toward the end of printing.

The screen printing device 110 with the above-mentioned structure can obtain a high-precision and non-bleeding printed image 39 by having the above-mentioned correction printing pattern 41 and a base 19 capable of supporting the substrate 13 at an angle. In this case, the offset of the printed pattern changes according to the gap in the height direction (Z direction) that gradually decreases toward the end of printing. Therefore, the correction printing pattern 41 also considers the offset amount of the printing pattern that changes according to the gradually decreasing gap h ₁ to h ₂ (refer to FIG. 12) for correction. As a result, in the screen printing apparatus 110, the release from the start of printing to the end of printing was good.

Therefore, according to the screen printing apparatus 110 of the present configuration example, even if the gap between the base material 13 and the screen printing plate 21 is increased, printing with high accuracy and low bleeding can be always achieved, and the deformation of the printed pattern can be suppressed.

In addition, the screen 27 is supported by the frame 29 with its symmetry axis being the direction along the printing direction and the direction orthogonal to the printing direction. In this way, the geometric conditions required to obtain the corrected print pattern 31 can be easily obtained. In addition, even if it is a screen 27 that includes a correction printing pattern that does not have a symmetry axis, the correction printing pattern corresponding to the curved surface shape of the substrate 13 can be uniquely obtained by the above calculation formula, which can reduce the manufacturing cost or shorten The production time of the screen version.

As such, the present invention is not limited to the above-mentioned embodiments. Combining each configuration of the embodiment with each other, or those skilled in the art based on the description of the specification and well-known technologies, are also predetermined by the present invention and included in the scope of protection. .

As mentioned above, the following matters are disclosed in this manual.

(1) A screen printing device characterized in that it uses a squeegee to press a screen printing plate with an elastically deformable screen onto the printed surface of a substrate with a curved shape to form the desired printing The printing layer of the pattern, and the screen is arranged on the printed surface of the substrate with a gap; the screen is formed with a correction printing pattern, and the correction printing pattern is the same as the desired printing In a consistent pattern, when the screen is pressed down on the squeegee and scanned in the printing direction, in the printing direction of the printing layer, the width direction of the squeegee arranged across the printing direction, and The deviation of the printing pattern caused by elastic deformation in the height direction of the printed surface perpendicular to the printing direction and the width direction is corrected.

According to this screen printing apparatus, it is possible to suppress a decrease in printing accuracy caused by a shift in the printing pattern when the screen is pressed down. That is, the corrected print pattern of the reduced print pattern is created to cancel the offset geometrically. By printing using the corrected printing pattern, a printed image consistent with the desired printing pattern as a target can be obtained.

(2) The screen printing device according to (1), wherein the screen has: a low-density portion that allows printing materials to pass through; and a high-density portion that restricts the passage of the printing materials; and the low-density portion and the high The density portion is arranged adjacently, and at least a part of the boundary line between the density portion and the high density portion is corrected.

According to this screen printing device, the printing material passes through the low-density part and is restricted to pass through the high-density part. That is, the boundary line between the low-density part and the high-density part forms the contour line of the printed image. The screen printing device forms a correction printing pattern by using at least a part of the boundary line as a correction line to correct the deformation caused by stretching.

(3) The screen printing device according to (2), wherein the low-density portion surrounds the high-density portion The first high density part is formed.

According to this screen printing device, even when the printing accuracy of the frame-shaped portion surrounding the center portion is required, a desired printing pattern set as a target can be printed with high accuracy.

(4) The screen printing device according to (2) or (3), wherein the low-density portion is formed by being surrounded by a second high-density portion constituting the high-density portion.

According to this screen printing apparatus, even when the printing accuracy of the frame-shaped printing outer peripheral portion is required, a desired printing pattern set as a target can be printed with high accuracy.

(5) The screen printing device according to any one of (1) to (4), wherein the screen has at least one symmetry axis.

According to this screen printing device, the screen is supported by the frame in a direction in which the axis of symmetry becomes the center of the direction along the printing direction and orthogonal to the printing direction. In this way, the geometric conditions required to obtain the corrected print pattern can be easily obtained.

(6) The screen printing device according to any one of (1) to (5), wherein the screen has a polygonal shape in a plan view.

According to this screen printing device, the geometric conditions required to obtain the corrected printing pattern of the screen can be easily obtained.

(7) The screen printing device according to any one of (1) to (5), wherein the screen has a rectangular shape in a plan view.

According to this screen printing device, the screen is supported by the frame so that one side becomes parallel to the printing direction, and can capture printing offset in two types, vertical and horizontal. In this way, the geometric conditions required to obtain the corrected print pattern can be easily obtained.

(8) The screen printing device according to any one of (1) to (7), which has a pedestal that supports the substrate in a posture that maximizes the gap at the start of printing.

According to this screen printing device, the pedestal is positioned at the end of printing, and the angle formed between the screen on the upstream side in the printing direction and the printed surface is larger than the downstream side in the printing direction, so that the printed surface is inclined to support the substrate. As a result, the screen printing device system was good for release from the beginning of printing to the end of printing.

(9) The screen printing device according to any one of (1) to (8), wherein the gap between the screen and the printed surface of the substrate is wider on the upstream side of the printing direction than on the downstream side.

According to this screen printing device, the release from the start of printing to the end of printing was good.

(10) A screen printing plate, characterized in that it is a screen printing plate that fixes the screen edge of an elastically deformable screen to a frame and is used for screen printing on a substrate with a curved shape, and the above The screen has: a low-density portion that allows the printing material to pass through; and a high-density portion that restricts the passage of the printing material; the low-density portion is arranged adjacent to the high-density portion, and the boundary between it and the high-density portion At least a part of the line is a curve.

According to this screen printing plate, the printing material passes through the low-density part and is restricted to pass through the high-density part. That is, the boundary line between the low-density part and the high-density part forms the contour line of the printed image. In screen printing, at least a part of the boundary line is used as a correction line to form a correction printing pattern, which can correct the deformation caused by stretching.

(11) The screen printing plate of (10), wherein the low-density portion is formed to surround the first high-density portion constituting the high-density portion.

According to this screen printing plate, even when the printing accuracy of the frame-shaped portion surrounding the center portion is required, a desired printing pattern set as a target can be printed with high accuracy.

(12) The screen printing plate of (10) or (11), wherein the screen has at least one symmetry axis.

According to this screen printing plate, the symmetry axis of the screen becomes along the printing direction and perpendicular to the printing The direction of the center of the direction is supported by the frame. In this way, the geometric conditions required to obtain the corrected print pattern can be easily obtained.

(13) The screen printing plate of any one of (10) to (12), wherein the screen has a polygonal shape when viewed from above.

According to the screen printing plate, the geometric conditions required to obtain the corrected printing pattern of the screen can be easily obtained.

(14) The screen printing plate of any one of (10) to (13), wherein the screen has a rectangular shape in a plan view.

According to this screen printing plate, the screen is supported by the frame so that one side becomes parallel to the printing direction, and it is possible to capture printing offset in two types, vertical and horizontal. In this way, the geometric conditions required to obtain the corrected print pattern can be easily obtained.

(15) A method of manufacturing a screen printing plate, characterized in that: the edge of the screen of the elastically deformable screen is fixed to the frame, and the squeegee is pressed against the screen to form a curved surface. The printed surface of the substrate forms the printed layer of the desired printing pattern, and includes the following steps: obtaining a corrected printing pattern that is consistent with the target desired printing pattern above The screen is generated due to elastic deformation in the printing direction of the printing layer, the width direction of the squeegee intersecting the printing direction, and the height direction of the printed surface orthogonal to the printing direction and the width direction Correcting the offset of the printed pattern; and forming the obtained corrected printed pattern on the screen.

According to the method for manufacturing the screen printing plate, it is possible to obtain a screen printing plate that suppresses the reduction in printing accuracy caused by the deviation of the printing pattern when the screen is pressed down. That is, by printing with a corrected printing pattern that offsets the offset geometrically, the desired printing pattern can be obtained as the target Consistent printed image.

(16) A method for manufacturing a substrate with a curved shape with a printing layer, characterized in that it uses a squeegee to press a screen printing plate with an elastically deformable screen onto the substrate with a curved shape The printed surface forms the printed layer of the desired printing pattern, and the above-mentioned screen has a corrected printing pattern, and the corrected printing pattern is applied to the above-mentioned screen in a manner consistent with the target desired printing pattern. When the squeegee presses down the screen and sweeps in the printing direction, the printing direction of the printing layer, the width direction of the squeegee intersecting the printing direction, and the direction orthogonal to the printing direction and the width direction The deviation of the print pattern caused by elastic deformation in the height direction of the printed surface is corrected.

According to the method for manufacturing a substrate with a printed layer, it is possible to obtain a substrate with a printed layer that suppresses the decrease in printing accuracy caused by the deviation of the printed pattern when the screen is pressed down.

In addition, the present invention will be explained in detail with reference to specific embodiments, but it should be obvious to those skilled in the art that various modifications or changes can be added without departing from the spirit and scope of the present invention.

This application is based on the Japanese patent application 2015-226118 filed on November 18, 2015 and the Japanese patent application 2016-196607 filed on October 4, 2016, the contents of which are incorporated herein by reference.

13‧‧‧Substrate

15‧‧‧Printed surface

17‧‧‧Scraper

19‧‧‧Pedestal

19a‧‧‧Pedest surface

19b‧‧‧Groove

20‧‧‧hole

21‧‧‧Screen printing plate

23‧‧‧Scraper Drive

25‧‧‧Front end of scraper

27‧‧‧Silk mesh

29‧‧‧Frame

100‧‧‧Screen printing device

Claims (16)

A screen printing device, which is characterized in that it uses a squeegee to press a screen printing plate with an elastically deformable screen onto the printed surface of a substrate with a curved shape to form a desired printing pattern. Layer, and the screen is arranged on the printed surface of the substrate with a gap; the screen is formed with a correction printing pattern, and the correction printing pattern is consistent with the desired printing pattern as the target When the screen is pressed down on the squeegee and scanned in the printing direction, the printing direction of the printing layer, the width direction of the squeegee intersecting the printing direction, and the orthogonal The deviation of the printing pattern caused by elastic deformation in the height direction of the printed surface between the printing direction and the width direction is corrected. The screen printing device of claim 1, wherein the screen has: a low-density portion that allows printing materials to pass through; and a high-density portion that restricts the passage of the printed materials; and the low-density portion is adjacent to the high-density portion Ground configuration, and at least a part of the boundary line between it and the high-density portion is corrected. The screen printing device of claim 2, wherein the low-density portion is formed to surround the first high-density portion constituting the high-density portion. The screen printing device of claim 2 or 3, wherein the low-density portion is formed by being surrounded by a second high-density portion constituting the high-density portion. The screen printing device according to any one of claims 1 to 3, wherein the screen has at least one axis of symmetry. The screen printing device according to any one of claims 1 to 3, wherein the screen has a polygonal shape in a plan view. The screen printing device according to any one of claims 1 to 3, wherein the screen has a rectangular shape in a plan view. The screen printing device according to any one of claims 1 to 3, which has a pedestal that supports the substrate in a posture that maximizes the gap at the start of printing. The screen printing device according to any one of claims 1 to 3, wherein the gap between the screen and the printed surface of the substrate is wider on the upstream side of the printing direction than on the downstream side. A screen printing plate, which is characterized in that it fixes the screen edge of the elastically deformable screen to the frame and is used for screen printing on a substrate with a curved shape, and the screen has : The low-density part, which allows the printing material to pass through; and the high-density part, which restricts the passage of the printing material; the low-density part is arranged adjacent to the high-density part, and at least the boundary line between it and the high-density part One part is a curve. Such as the screen printing plate of claim 10, wherein the above-mentioned low-density part is surrounded to constitute the above-mentioned high-density The first high-density part of the degree part is formed. Such as the screen printing plate of claim 10 or 11, wherein the above-mentioned screen has at least one symmetry axis. Such as the screen printing plate of claim 10 or 11, wherein the screen has a polygonal shape in a plan view. Such as the screen printing plate of claim 10 or 11, wherein the screen has a rectangular shape in a plan view. A method for manufacturing a screen printing plate, which is characterized in that: the edge of the screen of the elastically deformable screen is fixed to the frame, and the squeegee is pressed against the screen, and the base material has a curved shape. A printed layer with a desired printing pattern is formed on the printed surface, and includes the steps of: obtaining a corrected printing pattern, which is applied to the screen in a manner consistent with the target desired printing pattern Printed patterns produced by elastic deformation in the printing direction of the printing layer, the width direction of the squeegee arranged across the printing direction, and the height direction of the printed surface orthogonal to the printing direction and the width direction The offset is corrected; and the obtained correction printing pattern is formed on the screen. A method for manufacturing a substrate with a printed layer with a curved shape, characterized in that it uses a squeegee to press a screen printing plate with an elastically deformable screen onto a curved shape The printed surface of the substrate forms the printed layer of the desired printing pattern, and the above-mentioned screen has a corrected printing pattern, and the corrected printing pattern is applied to the above-mentioned silk in a manner consistent with the target desired printing pattern. When the screen presses the screen under the squeegee and sweeps it in the printing direction, the printing direction of the printing layer, the width direction of the squeegee arranged intersecting the printing direction, and orthogonal to the printing direction and the width The direction of the print pattern offset due to elastic deformation in the height direction of the above-mentioned printed surface is corrected.

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