JP3573657B2 - Work printing method and work printing adhesive - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to printing of a work having a through hole. In particular, the present invention relates to printing on a substrate on which a BGA (ball grid array) or CSP (chip size package) is mounted, for example, a thin substrate having a thickness of 0.3 mm or less.
[0002]
[Prior art]
FIG. 16 is a perspective view showing a screen printing machine.
FIG. 17 is a schematic side view of the screen printing machine.
FIG. 18 is a schematic plan view of the screen printing machine.
[0003]
In FIG. 16, 101 is a screen printing machine, 102 is a base of the screen printing machine, 103 is a movable table movably mounted, 104 is a guide rail for guiding the movement of the movable table, and 105 is an operation box of the screen printing machine. And 107, an operation switch attached to the operation box, and 109, a printing unit that performs screen printing on a work placed on the moving table 103.
17 and 18, reference numeral 110 denotes a work placed on the moving table 103; 200, a screen plate; 201, a screen frame of the screen plate 200; 211, a screen stretched on the screen plate 200; 106, a squeegee 111; A slider 108 holds a scraper (not shown) and slides in the directions of arrows A and D, and a frame 108 slides the slider 106.
[0004]
The moving table 103 is mounted so as to slide left and right along a guide rail 104 mounted on the base 102. When the moving table 103 moves below the printing unit 109, the moving table 103 is stopped by a stopper (not shown), and the printing unit 109 performs screen printing on the work 110.
[0005]
The moving table 103 is provided with a suction hole 190, and has a structure such that the work 110 can be sucked to the moving table 103 by sucking air as shown by an arrow.
[0006]
[Problems to be solved by the invention]
The moving table 103 of the conventional screen printing machine is provided with a suction hole 190 so as to suck the work 110, but when the work 110 is made of a soft material or is thin. As shown in FIG. 19, the surface of the work 110 may be uneven. As described above, when the surface of the work 110 is wavy, there is a problem that printing is not performed accurately.
[0007]
Further, as shown in FIG. 20, the work 110 may have a through hole 191 in some cases. The through hole 191 is a through hole penetrating from the front to the back of the work 110 as shown in FIG. If the position of the through hole 191 matches the position of the suction hole 190 of the moving table 103 and printing is performed, the ink 199 is sucked from the suction hole 190, and the back surface of the work 110 is stained. there were.
In addition, when printing is performed to fill the through hole 191 with the ink 199 (fill-in printing is performed), the through hole 191 is sucked through the suction hole 190, and the through hole 191 is not filled with the ink 199. The problem arises.
[0008]
FIG. 22 illustrates a case where suction is actively used when filling the through hole 191 of the work 110 with the ink 199. The work 110 is supported by a vinyl chloride plate 197 and a post 196. Then, by sucking the air as indicated by the arrow, the ink 199 is easily filled in the through hole 191. However, after filling printing, there is a case where it is necessary to polish the ink rising from the work to flatten the surface of the work.
[0009]
When the thickness of the BGA substrate or the CSP substrate is 0.2 mm or less, the thickness is too thin, so that a jig having a lower periphery of the through hole cannot be used. This is because, as shown in FIG. 23, since the substrate is thin, the portion of the through hole is lowered, and the ink cannot be applied uniformly. In addition, after the filling printing, the raised ink from the work may be polished to flatten the surface of the work, but since the substrate is thin, it is impossible to polish the substrate after the filling printing.
[0010]
The present invention has been made in order to solve the above problems, and even when the work is thin or the work is easily bent, the work can be placed flat on the table surface. The purpose is to be able to do it.
[0011]
Further, according to the present invention, even when there is a through-hole in the work, the work can be surely sucked to the table, and the printed ink falls through the through-hole, or the back surface of the work can be removed. The purpose is to keep it clean.
[0012]
Another object of the present invention is to make it possible to reliably fill the through holes of the work with ink.
[0013]
[Means for Solving the Problems]
A work printing method according to the present invention is a work printing method for printing a surface of a work having a through hole by a printing machine,
A mounting step of attaching an adhesive for work printing having a surface-adhesive rough surface to the back surface of the work,
A printing step of printing the surface of the work after the mounting step.
[0014]
The work printing adhesive having an adhesive rough surface used in the mounting step and the printing step is such that the average distance between the centers of the convex portions of the rough surface is within the diameter of a plurality of through holes provided in the work. And the average height from the valley to the top of the convex part of the rough surface is 2 to 30 μm.
[0015]
The work printing adhesive used in the mounting step and the printing step has an average particle diameter of 1/2 to 1/20 of the smallest through hole diameter among the plurality of through holes provided in the work. Characterized by having an adhesive rough surface in which powder having the following is dispersed.
[0016]
The pressure-sensitive adhesive for work printing used in the mounting step and the printing step is a pressure-sensitive adhesive having an adhesive rough surface obtained by applying a pressure-sensitive adhesive on a base material of the pressure-sensitive adhesive in advance, after applying an uneven surface treatment. There is a feature.
[0017]
The unevenness processing is a mesh processing performed in a mesh shape.
[0018]
The uneven processing is a circular processing formed into a circular shape.
[0019]
The unevenness processing is an irregular shape processing that is processed into an irregular shape.
[0020]
A roll-shaped adhesive is used as the adhesive for work printing.
[0021]
An adhesive sheet is used as the adhesive for work printing.
[0022]
The pressure-sensitive adhesive for work printing has a solvent resistance that is not practically affected by the solvent of the ink used for printing by the printing press.
[0023]
The diameter of the through hole is 80 μm or more.
[0024]
The pressure-sensitive adhesive for work printing according to the present invention is characterized in that when printing the surface of a work having a through hole with a printing machine, the pressure-sensitive adhesive is applied to the back surface of the work and has an adhesive rough surface whose surface is controlled.
[0025]
In the pressure-sensitive adhesive for work printing, the average distance between the centers of the protruding portions on the rough surface is 1/2 to 1/20 of the diameter of the smallest through-hole among a plurality of through-holes provided in the work. In this case, the average height from the valley to the top of the rough surface convex portion is 2 to 30 μm.
[0026]
The pressure-sensitive adhesive for work printing has a viscosity in which powder having an average particle diameter of 1/2 to 1/20 of the diameter of the smallest through-hole among the diameters of the plurality of through-holes provided in the work is dispersed. It is characterized by having a rough surface.
[0027]
The above-mentioned pressure-sensitive adhesive for work printing is characterized in that the pressure-sensitive adhesive substrate has a roughened adhesive surface obtained by applying a pressure-sensitive adhesive to the surface of the pressure-sensitive adhesive material beforehand.
[0028]
The work printing adhesive is affixed to the back surface of the work to be printed by the screen printing machine, is placed between the work and the table during screen printing, is suctioned by the table, and the surface of the work printing adhesive is controlled. The rough surface has a gap that allows gas in the through hole to escape between the back surface of the work and the adhesive for work printing so that the ink filling is not hindered when the ink is filled into the work through hole by screen printing. The gap is provided from the periphery of the through hole to the back surface of the work, and the gap is a small gap so that the ink does not flow around to the back surface of the work.
[0029]
The diameter of the through hole is 80 μm or more.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
The present invention is preferably applied to screen printing of a BGA substrate or a CSP substrate. The current BGA substrate or CSP substrate has a thickness of 0.2 mm, but will be 0.1 mm or less in the near future. When the thickness of the substrate (work) is 0.1 mm or less, the substrate itself becomes soft, the substrate warps (distortion) occurs, and the conventional method of using a jig for fixing the work requires that the substrate be securely fixed. Becomes difficult. Therefore, as a method for fixing the substrate to the table of the screen printing machine, a major feature of the present invention is to use a fixing method using a tape (adhesive film) having an adhesive rough surface whose surface is controlled.
[0031]
FIG. 1 is a diagram showing an embodiment of a screen printing machine according to the present invention.
The screen plate making 99 includes a screen 90 and a screen frame 92. The screen printing machine has a squeegee 112. On both sides of the table 70, a roll-shaped adhesive material 66 and a roll-shaped winding material 67 are provided. An adhesive tape 65 is attached so as to be continuously movable with the adhesive surface facing upward from the roll-shaped adhesive material 66 to the roll-shaped winding material 67. The back surface of the work 50 is attached to the adhesive tape 65. The work 50 has a through hole (through hole) 61. The table 70 can reciprocate in the directions of arrows B and C. The squeegee 112 performs a printing operation in the direction of arrow A. The roll-shaped adhesive material 66 rotates in the direction of arrow B, and pays out the adhesive tape 65, and the adhesive tape 65 moves with the work in the direction of arrow F. The roll-shaped winding material 67 rotates in the direction of arrow G, and winds the adhesive tape 65. The width W1 of the work 50 is equal to the width W2 of the adhesive tape 65 (W1 = W2).
[0032]
Next, the conventional adhesive tape 34 and the adhesive tape 65 of the present invention will be described with reference to FIGS.
The conventional adhesive tape 34 shown in FIG. 2 includes a conventional adhesive layer 31 coated with an adhesive and a film 33. When printing is performed using the conventional adhesive tape 34, since the lower periphery of the through-hole 61 is closely covered with the conventional adhesive layer 31, there is no place for the air in the through-hole 61 to escape. For this reason, when the ink 84 is filled from above, the air pressure may hinder the filling of the ink 84, and the ink 84 may not sufficiently enter the through hole 61.
On the other hand, as shown in FIG. 3, the pressure-sensitive adhesive tape 65 of the present invention uses a film 33 as a pressure-sensitive adhesive base material and applies the pressure-sensitive adhesive of this embodiment to the entire surface of one side of the film 33. It has a formed adhesive layer. The film 33 supports the adhesive layer 35, and the adhesive layer 35 has an uneven portion. Due to the presence of the uneven portion, the air in the through hole 61 can enter the concave portion of the adhesive layer 35 and does not hinder the ink 84 from entering the through hole 61.
On the other hand, the gap formed in the concave portion of the adhesive layer 35 is not large enough to guide the viscous liquid ink 84. That is, the uneven portion formed on the adhesive layer 35 is an uneven portion for allowing air (or gas) to escape, and does not have a gap enough to draw in the ink 84 (or liquid).
[0033]
Next, the difference between the conventional adhesive tape 34 and the adhesive tape 65 of the present invention will be described with reference to FIGS.
As shown in FIG. 4, the pressure-sensitive adhesive layer 31 (conventional pressure-sensitive adhesive) of the conventional pressure-sensitive adhesive tape 34 is configured to be easily dissolved by the solvent of the ink 84 (including a thinner, a diluent, and a mixed solvent). Therefore, when the conventional adhesive tape 34 is peeled off from the work 50, the conventional adhesive layer 31 (conventional adhesive) may be dissolved and remain on the work 50 or the circuit pattern 86. Further, when the adhesive force of the conventional adhesive layer 31 is too strong, there is a possibility that the ink 84 filled in the through hole 61 (or the ink 84 printed on the surface of the work 50) may be peeled off.
On the other hand, as shown in FIG. 5, the pressure-sensitive adhesive tape 65 of the present invention is provided with a pressure-sensitive adhesive layer 35 that is not dissolved or substantially not dissolved by the solvent of the ink 84. That is, the pressure-sensitive adhesive layer 35 (pressure-sensitive adhesive of this embodiment) has solvent resistance that does not completely or practically dissolve in the solvent of the ink 84. Therefore, when the adhesive tape 65 is peeled off from the work 50, the adhesive layer 35 does not remain on the work 50. Here, "not practically dissolved" means that even if it is dissolved, it does not adversely affect the subsequent screen printing process and the yield and quality of the work.
In addition, since the unevenness is present on the surface of the adhesive layer 35, the adhesive strength is weakened, the adhesive can be easily peeled off from the work 50 or the circuit pattern 86, and the ink 84 (or the work 50 There is little fear that the ink 84) printed on the surface will be peeled off.
[0034]
As described above, the use of the adhesive tape 65 of the present invention has the following advantages.
(1) A plurality of adhesive tapes 65 having different adhesive strengths are prepared, and an optimal adhesive tape 65 can be used according to the thickness of the work 50, the viscosity of the ink 84, and the like. That is, it is easy to control the adhesive strength.
(2) Providing the uneven portion on the surface of the adhesive layer 35 of the adhesive tape 65 facilitates the flow of air and facilitates the filling of the ink 84. Further, since the adhesive tape 65 as a whole is flat, there is no ink spillage on the back surface of the work. That is, the through-hole 61 is closed by the adhesive tape 65, and the entire adhesive tape 65 is sucked by the table, so that the back surface of the work is flat, and the protrusion of the ink 84 on the back surface of the work is eliminated. The removal polishing work is not required.
(3) Compared with the case where a conventional jig is used, the positioning of the jig and the work 50 is not required, and the positioning operation is not required. That is, when setting a work on a table (on a jig), a pin guide and an image recognition device are not required.
(4) Conventionally, when performing fill-in printing only where there is a through-hole, printing was performed using a screen of a fill-in pattern, but in the present invention, the back surface of the substrate is supported flat by an adhesive tape 65. Therefore, when performing fill-in-the-blank printing, printing a solid pattern is sufficient. The solid pattern refers to a print pattern that is uniform over the entire surface without using any special pattern. Since the printing is performed by the solid pattern, an accurate positioning operation of the work on the table becomes unnecessary.
(5) When performing double-sided printing, after printing on one side, and then printing on another side, the entire printed side is covered with an adhesive tape, and the surface of the printed work does not directly touch the table. Prevention of contamination by ink on the surface.
(6) The suction holes provided in the table can be used as before. That is, the entire surface of the adhesive tape 65 is sucked to the table by suction from the suction holes of the table, and the entire surface of the work 50 is adhered by the adhesive layer 35 of the adhesive tape 65. As a result, the work 50 is completely fixed to the table. Will be done.
(7) Since the work 50 is adhered by the adhesive tape 65, the separation of the plate is improved when the screen 90 is peeled off from the work 50 after printing. When the screen 90 and the work 50 are peeled off by lifting the screen 90 after printing or by lowering the table 70 after printing, the work 50 is stuck to the screen 90 because the work 50 is adhered by the adhesive tape 65. Can be prevented. That is, there is an advantage that separation of the plate is improved. In particular, when the work 50 is a thin substrate having a thickness of 0.1 mm or less, the end of the work 50 may be stuck to the screen 90. It is effective to improve.
[0035]
FIG. 6 is a flowchart showing a printing method of the screen printing machine according to the present invention.
First, the adhesive tape 65 is attached to the back surface of the work (S11), carried into the table 70 and sucked (S12). Next, in S13, screen printing is performed on the surface of the work. Since the back surface of the work 50 is supported flat by the adhesive tape 65 without any depression, the work 50 can be printed without any deformation and without the ink 84 wrapping around the back surface of the substrate of the through hole 61. Can be. When printing is performed in the state shown in FIGS. 21, 22, and 23, a problem occurs in which the ink wraps around the back surface. In contrast, in the present invention, the work is performed using the adhesive tape 65. Since the entire back surface of the cover 50 is flat and closely covered, the ink 84 does not flow around the back surface.
[0036]
Next, returning to FIG. 6, in S14, the suction of the table is stopped, and the adhesive tape 65 is wound up, so that the work 50 is carried out of the table 70. In S15, the adhesive tape 65 is peeled off from the work. Further, in S16, the work is placed in a drying chamber and dried.
[0037]
FIG. 7 is a diagram illustrating details of the adhesive tape 65.
FIG. 7A is a cross-sectional view, and FIG. 7B is a plan view. The EE section of (b) is (a).
As described above, the adhesive tape 65 includes the adhesive layer 35 and the film 33 (an example of an adhesive base material). The adhesive layer 35 has a rough surface 46 whose surface is controlled. The rough surface 46 whose surface is controlled refers to a surface having the convex portions 44 and the concave portions 45. The protrusions 44 are formed, for example, by uniformly or randomly dispersing the powder 43 and overlaying the thin adhesive layer 35 thereon. The workpiece 50 has a plurality of through-holes 61 having different diameters. If the diameter of the smallest through-hole among the plurality of through-holes 61 is the through-hole diameter F, the through-hole diameter F is 80 μm or more. It is desirable to have. If the through-hole diameter F is less than 80 μm, the diameter becomes too small, and it becomes difficult for the ink to physically enter.
In addition, it is desirable that the height difference between the convex portion 44 and the concave portion 45, that is, the average height from the valley to the top of the convex portion of the rough surface is 2 to 30 μm in order to form a gap formed in the concave portion of the adhesive layer 35. . When the average height from the valley to the top of the convex portion of the rough surface is 2 to 30 μm, a gap is formed for allowing air (or gas) to escape, and a gap is not generated enough to draw in the ink 84 (or liquid). You can do so.
[0038]
The particle diameter of the powder 43 varies as H1, H2, H3, H4,.
FIG. 8 is a diagram showing the distribution of the variation in the particle diameter of the powder 43.
The average of the particle diameters of the powder 43 is defined as an average particle diameter H. The average particle size H is 1/2 to 1/20 (or 1/2 to 1/30) of the through-hole diameter F which is the diameter of the smallest through-hole. Desirably, 1/5 to 1/10 is used.
[0039]
The distance between the centers (tops) of the convex portions 44 of the rough surface 46 whose surface is controlled is G1, G2, G3, G4,.
FIG. 9 is a diagram showing the distribution of the variation in the center-to-center distance of the protrusions 44.
Assuming that the average value of the distances between the centers of the protrusions is the average distance G between the centers of the protrusions, the average distance G between the centers of the protrusions is 1/2 to 1/1 / the diameter F of the through hole having the smallest diameter. 20 (or 1/2 to 1/30). Desirably, the average distance G between the centers of the convex portions is 1/5 to 1/10 of the diameter F of the through hole.
[0040]
FIG. 10 is a conceptual diagram showing some examples of the through hole diameter F and the average distance G between the centers of the convex portions.
(A) shows a case where the through hole diameter F and the average distance G between the centers of the convex portions are substantially the same. (B) shows a case where the average distance G between the centers of the convex portions is about の of the diameter F of the through-hole. (C) shows the case where the average distance G between the centers of the convex portions is about 1/3 of the diameter F of the through hole. (D) shows the case where the average distance G between the centers of the convex portions is about 1/6 of the diameter F of the through hole.
As can be seen from FIG. 10, as the value of the through hole diameter F and the average distance G between the centers of the convex portions become closer, the number of gaps for allowing the air in the through hole 61 to escape becomes smaller, while the size of the gap becomes larger. Conversely, the smaller the value of the average center-to-convex center distance G, the greater the number of gaps, but the smaller the size of the gaps. If the size of the gap is too large, there is a high probability that the ink will flow around the back surface of the work. Conversely, when the average distance G between the centers of the convex portions is reduced and the size of the gap is reduced, the state in which the adhesive layer 35 is completely adhered to the back surface of the work is approached. In the close contact state, the ink does not wrap around, but there is a disadvantage that the gas in the through hole 61 is difficult to escape, and a problem that the adhesive tape 65 is difficult to peel when peeled off. Accordingly, as described above, by setting the average distance G between the centers of the convex portions to be 1/2 to 1/20 (or 1/2 to 1/30) of the through-hole diameter F, the filling of the ink is not hindered. It is possible to secure a gap for allowing gas in the through hole 61 to escape, and to provide a gap that can prevent ink from flowing from the gap to the back surface of the work.
[0041]
In FIG. 7, the rough surface 46 whose surface is controlled is formed using the powder 43. However, the film serving as the adhesive base material is subjected to unevenness processing to form the rough surface 46 whose surface is covered with the adhesive. You may do so.
FIG. 11A shows a case where a circular processed portion 40 is provided on the film 32. (B) shows a case where the film 32 is provided with a square processing portion 41. (C) shows a case where the irregularly shaped portion 42 is provided on the film 32.
Further, it may be processed into a mesh shape.
FIG. 12 shows a case where a circular processing portion 40, a square processing portion 41, and an irregular processing portion 42 are formed by pressing (embossing) the pressing die 30 against the film 32.
In the case where the irregularly shaped portion 42 is formed on the film 32, as shown in FIG. 13, sand, powder or particles are beaten to the surface of the film 32 by a sand blast method to form the irregularly shaped portion 42. You can also.
Further, as shown in FIG. 14, a mesh 47 processed into a mesh shape may be used as the adhesive base material.
[0042]
The pressure-sensitive adhesive tape includes a pressure-sensitive adhesive base material other than the film 33. For example, the adhesive substrate may be cloth, paper, plastic, synthetic resin, or mesh.
[0043]
Further, an adhesive sheet other than a roll-shaped adhesive tape (roll-shaped adhesive material) may be used. For example, the pressure-sensitive adhesive sheet may be a plate-shaped or patch-shaped pressure-sensitive adhesive seal, pressure-sensitive adhesive plate, pressure-sensitive adhesive plate, or pressure-sensitive adhesive foil having the same shape and the same size as the work.
FIG. 15 shows a case where an adhesive sheet having the same shape is attached to a work.
The shape and size of the pressure-sensitive adhesive sheet may be different from those of the work.
[0044]
Further, the pressure-sensitive adhesive tape or the pressure-sensitive adhesive sheet may not cover the entire surface of the work, but may cover only a part of the work. Also, it may be used several times without disposable only once.
[0045]
A double-sided tape having an adhesive layer on both sides as well as one side may be used.
[0046]
Further, the adhesive layer may not be provided on the entire surface of the film 33 or may be provided on a part thereof. For example, the adhesive layer may be provided only at the center of the film 33.
[0047]
Further, the adhesive layer may have an intermittent shape, a stripe shape, a check shape, or a polka dot shape.
[0048]
Further, the adhesive layer may be provided only around or near the through hole.
[0049]
Further, other particles may be used instead of the powder. For example, beads may be used. The powder may be dispersed in a form processed into a paste or the like. In addition, any material may be used regardless of an organic or inorganic material.
[0050]
【The invention's effect】
As described above, according to the present invention, since the adhesive tape is provided between the work and the table, even if the work is thin, the work can be fixed on the table while keeping the work flat. This has the effect.
[0051]
Further, according to the present invention, even if the work has a through-hole, the ink can be filled into the through-hole because the adhesive tape 65 is adhered to the entire back surface of the work.
[0052]
Further, according to the present invention, since the uneven portion is provided on the surface of the adhesive tape 65, the air in the through hole can be released, and the ink can be easily filled.
[0053]
Further, according to the present invention, since the pressure-sensitive adhesive of the pressure-sensitive adhesive tape is insoluble or hardly soluble in the solvent of the ink, the pressure-sensitive adhesive dissolved on the back surface of the work does not remain as contamination.
[0054]
Further, according to the present invention, the average distance G between the centers of the convex portions is set to 1/2 to 1/20 (or 1/2 to 1/30) of the diameter F of the through-hole. Gaps can be left.
[0055]
According to the present invention, since the average particle diameter H of the powder is set to 1/2 to 1/20 (or 1/2 to 1/30) of the through-hole diameter F, the powder is provided between the work and the adhesive. The gap can be set to an appropriate value.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a main part of a screen printing machine according to the present invention.
FIG. 2 is a diagram showing a printing state using a conventional adhesive tape 34.
FIG. 3 is a diagram showing a printing state using the adhesive tape 65 of the present invention.
FIG. 4 is a view when the conventional adhesive tape is peeled off.
FIG. 5 is a diagram showing a case where the adhesive tape 65 of the present invention is peeled off.
FIG. 6 is a diagram showing a screen printing method of the present invention.
FIG. 7 is a plan view and a sectional view of an adhesive layer 35 of the adhesive tape 65 of the present invention.
FIG. 8 is a distribution diagram of the particle size of the powder.
FIG. 9 is a distribution diagram of the center-to-center distance of the convex portions 44 of the rough surface 46 whose surface is controlled.
FIG. 10 is a diagram showing a relationship between a through hole diameter F and an average center distance G between convex portions.
FIG. 11 is a view showing a film 32 of the present invention.
FIG. 12 is a diagram showing a method for forming unevenness according to the present invention.
FIG. 13 is a diagram illustrating a method for forming unevenness according to the present invention.
FIG. 14 is a diagram showing an example of the pressure-sensitive adhesive base material of the present invention.
FIG. 15 is a view showing an adhesive sheet 64 of the present invention.
FIG. 16 is a perspective view of a conventional screen printing machine.
FIG. 17 is a side view of a conventional screen printing machine.
FIG. 18 is a plan view of a conventional screen printing machine.
FIG. 19 is a diagram showing a problem of a conventional screen printing machine.
FIG. 20 is a view showing a conventional work having a through hole.
FIG. 21 is a diagram showing a problem when printing on a work having a conventional through hole.
FIG. 22 is a diagram illustrating filling of a hole using a conventional suction force.
FIG. 23 is a diagram showing a conventional screen printing state method.
[Explanation of symbols]
30 stamping die, 31 conventional adhesive layer, 32, 33 film, 34 conventional adhesive tape, 35 adhesive layer, 36 motor, 40 circular processing part, 41 square processing part, 42 irregular processing part, 43 powder, 44 convex Part, 45 recess, 46 rough surface with controlled surface, 47 mesh, 50 workpiece, 61 through hole, 64 adhesive sheet, 65 adhesive tape, 66 roll adhesive, 67 roll winding, 70 table, 71 suction hole , 84 ink, 86 circuit pattern, 90 screen, 92 screen frame, 112 squeegee, F through-hole diameter, G average center-to-center distance, H average particle size.

Claims (15)

In a work printing method for printing the surface of a work having a through hole by a printing machine,
A mounting step of attaching an adhesive for work printing having a surface-adhesive rough surface to the back surface of the work,
After the mounting step, a printing step of printing the surface of the work,
With
The work printing adhesive having an adhesive rough surface used in the mounting step and the printing step is such that the average distance between the centers of the convex portions of the rough surface is within the diameter of a plurality of through holes provided in the work. in a 1 / 2-1 / 20 of the minimum diameter of the through hole diameter, characteristics and be Ruwa over click printing method that the average height from the valley of the convex portions of the rough surface to the top is 2 to 30 m. The work printing adhesive used in the mounting step and the printing step has an average particle diameter of 1/2 to 1/20 of the smallest through hole diameter among the plurality of through holes provided in the work. work printing method according to claim 1, wherein the tacky rough surface obtained by dispersing the powder with. The pressure-sensitive adhesive for work printing used in the mounting step and the printing step is a pressure-sensitive adhesive having an adhesive rough surface obtained by applying a pressure-sensitive adhesive on a base material of the pressure-sensitive adhesive in advance, after applying an uneven surface treatment. The method according to claim 1, wherein: The work printing method according to claim 3 , wherein the concave / convex processing is a mesh processing performed in a mesh shape. 4. The work printing method according to claim 3 , wherein the concavo-convex processing is a circular processing performed in a circular shape. 4. The work printing method according to claim 3 , wherein the irregular processing is an irregular processing that is processed into an irregular shape. Work printing method according to any one of claims 1 to 6, characterized by using a roll adhesive as the work for printing adhesive. The work printing method according to any one of claims 1 to 6 , wherein an adhesive sheet is used as the work printing adhesive. The work printing method according to any one of claims 1 to 6, wherein the work printing pressure-sensitive adhesive has solvent resistance that is not practically affected by a solvent of an ink used for printing by a printing machine. The diameter of the through hole, the work printing method according to any of claims 1 to 9, wherein the at 80μm or more. When printing the surface of the work having a through-hole by a printing machine, affixed to the back surface of the work, a work printing adhesive having a surface-controlled adhesive rough surface,
The work printing pressure-sensitive adhesive has an average distance between the centers of the protruding portions on the rough surface, which is 1/2 to 1 of the smallest through-hole diameter among a plurality of through-holes having a diameter of 80 μm or more provided on the work. / a 20, features and be Ruwa over click printing adhesive material that average height from the valley of Somentotsu portion to the top portion is 2 to 30 m. The work printing pressure-sensitive adhesive disperses a powder having an average particle diameter of 1/2 to 1/20 of the smallest through-hole diameter among a plurality of through-hole diameters of 80 μm or more provided in the work. The adhesive material for work printing according to claim 11 , wherein the adhesive material has a roughened adhesive surface. When printing the surface of the work having a through-hole by a printing machine, affixed to the back surface of the work, a work printing adhesive having a surface-controlled adhesive rough surface,
The work for printing adhesive material is in its adhesive base material in advance on subjected to uneven surface treatment, adhesive coated processed adhesive rough surface characteristics and to Ruwa over click printing adhesive material to have a. When printing the surface of the work having a through-hole by a printing machine, affixed to the back surface of the work, a work printing adhesive having a surface-controlled adhesive rough surface,
The work printing adhesive is affixed to the back surface of the work to be printed by the screen printing machine, is placed between the work and the table during screen printing, is suctioned by the table, and the surface of the work printing adhesive is controlled. The rough surface has a gap that allows gas in the through hole to escape between the back surface of the work and the adhesive for work printing so that the ink filling is not hindered when the ink is filled into the work through hole by screen printing. together provided over the workpiece rear surface from the periphery of the through hole, the gap has features and to Ruwa over click printing adhesive material that is 2 to 30 m. The pressure-sensitive adhesive material for work printing according to any one of claims 13 and 14 , wherein the diameter of the through hole is 80 µm or more.

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