JP2019030972A - Squeegee for screen printing - Google Patents

Abstract

To provide a squeegee easy in plate-separation, and capable of high-quality printing.SOLUTION: A squeegee has a front face, a rear face and a bottom part, and the bottom part has the front part tip in a crossing part with the front face, and has the rear part tip in a crossing part with the rear face, and has first and second contact parts contacting with a screen plate, and has a first inclined plane extending toward the front part tip from the first contact part and a second inclined plane extending toward the rear part tip from the second contact part, and there is a transition part between the first contact part and the second contact part, and in the transition part, a plane crossing with the first contact part is called as a first connection surface, and a plane crossing with the second contact part is called as a second connection surface, and assuming a part up to the second contact part from the first contact part in a plane P of passing through the first contact part and the second contact part as Pb, a part on the front face side more than the Pb among the plane P as Pa, an angle formed by the first inclined plane and the Pb as θ1 and an angle formed by a second connection surface and the Pb as θ2, θ2>θ1 is realized.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a squeegee for screen printing.

  Since screen printing technology can perform high-definition printing at high speed, it is used in a wide range of fields, such as the production of electronic circuit boards and the production of battery electrodes.

  Usually, when printing on a printing material by a screen printing method, first, a screen plate having a pattern is arranged on the printing material. Next, printing ink is placed on the surface of the screen plate (the surface opposite to the substrate). Next, the squeegee is moved in the horizontal direction while being pressed against the screen plate, whereby the printing ink is pressed in a pattern on the side of the substrate through the screen plate. As a result, a screen plate pattern can be printed on a substrate (for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 2001-221935 JP-A-9-314802

  In the screen printing method, “printing unevenness” may occur due to a change in pressing pressure of the squeegee against the screen plate.

  In the screen printing method, after printing, a step of separating the screen plate from the printing material, that is, a so-called plate separation step is required. At this time, if the printing ink filled in the opening of the screen plate and the printing ink remaining in the upper part are combined, a part of the printing ink on the printing material is transferred to the screen in the plate separation process. There is a problem that the shape of the pattern remaining on the printing material is changed due to being accompanied by the plate.

  In particular, in recent years, there has been an increasing demand for screen printing of a finer pattern, and when printing such a fine pattern, the above problem is expected to become more prominent.

  The present invention has been made in view of such a background, and the present invention provides a squeegee for screen printing that is unlikely to cause problems in the plate separation process and that can perform high-quality printing. Objective.

In the present invention, a squeegee for screen printing,
In screen printing, the front surface corresponding to the front side of the moving direction with respect to the screen plate, the rear surface corresponding to the rear side of the moving direction, and the bottom portion facing the screen plate,
The bottom has a front tip at the intersection with the front surface, and has a rear tip at the intersection with the rear surface,
The bottom portion has a first contact portion and a second contact portion that come into contact with the screen plate during screen printing, and the first contact portion is closer to the front surface,
The bottom portion further includes a first inclined surface extending from the first contact portion toward the front end, and a second inclination extending from the second contact portion toward the rear end. And having a surface,
A transition portion exists between the first contact portion and the second contact portion,
In the transition portion, a surface intersecting with the first contact portion is referred to as a first connection surface, a surface intersecting with the second contact portion is referred to as a second connection surface,
In the plane P passing through the first contact portion and the second contact portion, a portion from the first contact portion to the second contact portion is referred to as an intermediate plane Pb. The portion on the front side of the plane Pb is referred to as an outer plane Pa,
The angle between the first inclined surface and the outer plane Pa is θ1 (0 <θ1 <90 °), and the angle between the second connecting surface and the intermediate plane Pb is θ2 (0 <θ2 <180). °)
A squeegee is provided in which θ2 is greater than θ1.

  According to the present invention, it is possible to provide a screen printing squeegee that is unlikely to cause problems in the plate separation process and that can perform high-quality printing.

It is the perspective view which showed schematically the squeegee for screen printing by one Embodiment of this invention. It is the side view which expanded and showed the bottom part of the squeegee for screen printing by one Embodiment of this invention. It is the figure which showed typically the mode at the time of screen-printing to a to-be-printed material using the squeegee for screen printing by one Embodiment of this invention. It is the figure which showed typically the mode at the time of screen-printing to a to-be-printed material using the squeegee for screen printing by one Embodiment of this invention. It is the figure which showed typically the mode at the time of screen-printing to a to-be-printed material using the squeegee for screen printing by one Embodiment of this invention. It is the side view which expanded and showed the bottom part of another squeegee for screen printing by one Embodiment of this invention. It is the side view which expanded and showed the bottom part of another squeegee for screen printing by one Embodiment of this invention. It is the figure which showed typically the squeegee by one Embodiment of this invention comprised from two rubber members. It is the figure which showed typically the squeegee by one Embodiment of this invention comprised from the rubber member of 3 sheets. It is the side view which expanded and showed the bottom part of another squeegee for screen printing by one Embodiment of this invention.

In one embodiment of the present invention, a squeegee for screen printing,
In screen printing, the front surface corresponding to the front side of the moving direction with respect to the screen plate, the rear surface corresponding to the rear side of the moving direction, and the bottom portion facing the screen plate,
The bottom has a front tip at the intersection with the front surface, and has a rear tip at the intersection with the rear surface,
The bottom portion has a first contact portion and a second contact portion that come into contact with the screen plate during screen printing, and the first contact portion is closer to the front surface,
The bottom portion further includes a first inclined surface extending from the first contact portion toward the front end, and a second inclination extending from the second contact portion toward the rear end. And having a surface,
A transition portion exists between the first contact portion and the second contact portion,
In the transition portion, a surface intersecting with the first contact portion is referred to as a first connection surface, a surface intersecting with the second contact portion is referred to as a second connection surface,
In the plane P passing through the first contact portion and the second contact portion, a portion from the first contact portion to the second contact portion is referred to as an intermediate plane Pb. The portion on the front side of the plane Pb is referred to as an outer plane Pa,
The angle between the first inclined surface and the outer plane Pa is θ1 (0 <θ1 <90 °), and the angle between the second connecting surface and the intermediate plane Pb is θ2 (0 <θ2 <180). °)
A squeegee is provided in which θ2 is greater than θ1.

  In such a squeegee, the screen ink can be filled with printing ink using the first contact portion during screen printing. Further, the second contact portion can be used for scraping the printing ink remaining on the screen plate after the first contact portion has passed. As a result, it is possible to significantly reduce the printing ink remaining on the screen plate, particularly on the opening after printing.

  Further, in such a squeegee, at least two locations of the first contact portion and the second contact portion are brought into contact with the screen plate by one movement (one forward path), so that the opening of the screen plate is filled. It becomes possible to press the printing ink more reliably to the substrate.

  Due to such effects, when the squeegee according to one embodiment of the present invention is used, a part of the printing ink on the printing material is accompanied by the screen plate in the plate separation process, and the pattern remaining on the printing material is reduced. The problem that the shape changes can be significantly reduced. In addition, the pattern of the screen plate can be transferred to the substrate more reliably, “printing unevenness” is suppressed, and high-quality printing can be performed.

(Squeegee for screen printing according to an embodiment of the present invention)
Hereinafter, the configuration and characteristics of a squeegee for screen printing according to an embodiment of the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a schematic perspective view of a squeegee for screen printing (hereinafter referred to as “first squeegee”) according to an embodiment of the present invention.

  As shown in FIG. 1, the first squeegee 100 has a substantially band plate shape. More specifically, the first squeegee 100 has a front surface 110, a rear surface 112, and a bottom portion 114.

  The front surface 110 corresponds to the front side in the direction in which the first squeegee 100 moves relative to the screen plate during screen printing. The rear surface 112 corresponds to the rear side in the direction in which the first squeegee 100 moves relative to the screen plate during screen printing.

  On the other hand, the bottom portion 114 corresponds to the side where the first squeegee 100 faces the screen plate during screen printing. However, since the first squeegee 100 is used with the front surface 110 and the rear surface 112 inclined at a predetermined angle with respect to the screen plate during screen printing, the bottom 114 is parallel to the screen plate. Not necessarily.

  Here, for clarification of explanation, in the first squeegee 100, it is defined that both the front surface 110 and the rear surface 112 are parallel to the YZ plane (see FIG. 1). A longitudinal direction of the front surface 110 is a Y direction, and a direction perpendicular to the Y direction is a Z direction. Further, the distance between the front surface 110 and the rear surface 112 is referred to as “thickness”, and this direction is defined as the X direction. Further, in the first squeegee 100, the dimension in the Z direction is referred to as “(squeegee) height”, and the dimension in the Y direction is referred to as “(squeegee) width”.

  FIG. 2 is an enlarged side view showing the vicinity of the bottom 114 of the first squeegee 100.

  As shown in FIG. 2, the bottom portion 114 is not a single plane but is configured by combining a plurality of surfaces.

  More specifically, the bottom 114 has a front tip 120 that is an intersection with the front surface 110 and a rear tip 124 that is an intersection with the rear surface 112, and is located between the front tip 120 and the rear tip 124. Are provided with a first contact portion 130 and a second contact portion 140. The first contact portion 130 is provided on the side closer to the front end 120 than the second contact portion 140.

  Note that the first contact portion 130 and the second contact portion 140 correspond to locations where the first squeegee 100 contacts the screen plate when screen printing is performed using the first squeegee 100.

  In addition, a transition portion 150 that connects both contact portions is provided between the first contact portion 130 and the second contact portion 140.

  The transition portion 150 includes a first connecting surface 152 that intersects with the first contact portion 130, and a second connecting surface 154 that intersects the second contact portion 140.

  Further, the bottom portion 114 includes a first inclined surface 160 extending from the first contact portion 130 toward the front tip 120 and a second slope extending from the second contact portion 140 toward the rear tip 124. And an inclined surface 162.

  Here, in the first squeegee 100, a plane passing through the first contact portion 130 and the second contact portion 140 is P. Further, in the plane P, a portion from the first contact portion 130 to the second contact portion 140 is referred to as an intermediate plane Pb, and a portion closer to the front surface 110 than the first contact portion 130 is referred to as an outer plane Pa. The angle formed between the first inclined surface 160 and the outer plane Pa is the first angle θ1 (0 <θ1 <90 °), and the angle formed between the second connecting surface 154 and the intermediate plane Pb is the first angle θ1 (0 <θ1 <90 °). An angle θ2 of 2 (0 <θ2 <180 °) is defined.

  In this case, the first squeegee 100 has a feature that the second angle θ2 is larger than the first angle θ1.

  Hereinafter, for the sake of simplicity, the first angle θ1 is also referred to as “the angle of the first contact portion 130”, and the second angle θ2 is also referred to as “the angle of the second contact portion 140”.

  Next, with reference to FIG. 3 to FIG. 5, a mode in which screen printing is performed using the first squeegee 100 having the above-described configuration will be described.

  3 to 5 schematically show a state when screen printing is performed using the first squeegee 100.

  When screen printing is performed, a screen plate 182 is installed on the substrate 180 as shown in FIG. Although the material of the to-be-printed material 180 is not specifically limited, For example, paper, a metal, a semiconductor, glass, ceramics etc. may be sufficient. The screen plate 182 has a plurality of openings 184A and 184B corresponding to a pattern to be transferred to the substrate 180.

  Next, a paste 192 containing printing ink is placed on the screen plate 182.

  Further, as shown in FIG. 3, the first squeegee 100 is installed at a predetermined position on the screen plate 182.

  Here, as described above, the first squeegee 100 has the first contact portion 130 and the second contact portion 140 on the bottom portion 114. Therefore, when the first squeegee 100 is brought into contact with the screen plate 182, the first squeegee 100 comes into contact with the screen plate 182 at the first contact portion 130 and the second contact portion 140.

  Next, the first squeegee 100 is moved in the movement direction (the direction of arrow A). Alternatively, the assembly of the substrate 180 and the screen plate 182 may be moved in the direction opposite to the arrow A.

  As shown in FIG. 4, due to the relative movement of the first squeegee 100, first, the front surface 110 of the first squeegee 100 comes into contact with the paste 192. Further, by further movement of the first squeegee 100, the paste 192 comes into contact with the front end 120 of the first squeegee 100, and is then wound down below the first inclined surface 160 while moving along the moving direction. Thinly stretched on the plate 182.

  Thereafter, when the first contact portion 130 of the first squeegee 100 reaches the opening 184A of the screen plate 182, the paste 192 is filled into the opening 184A by the first contact portion 130. At the same time, the first contact portion 130 applies pressure to the paste filled in the opening 184A. As a result, the paste filled in the opening 184A of the screen plate 182 is pressed against the substrate 180, and the paste 193 is placed on the substrate 180.

  Here, as shown in FIG. 4, on the screen plate 182, the paste that has not been filled in the opening 184 </ b> A (referred to as “residual paste”) at the location where the first contact portion 130 of the first squeegee 100 has passed. 194 remains.

  As described above, such a residual paste 194 becomes an obstacle when the screen plate 182 is separated from the printing material 180 after printing, and can be a factor of deteriorating print quality.

  However, the first squeegee 100 has a second contact portion 140. Further, the second contact portion 140 has a second angle θ2 that is larger than the angle θ1 of the first contact portion 130.

  In this case, as shown in FIG. 5, the residual paste 194 that may be generated after the first contact portion 130 passes through the opening 184 </ b> A passes through the opening 184 </ b> A after the first contact portion 130 passes. 140 is scraped off. Therefore, after the second contact portion 140 passes, the residual paste 194 that can remain on the screen plate 182 is significantly reduced.

  The scraped residual paste 194 can be accumulated in the transition portion 150 of the bottom 114 of the first squeegee 100.

  As described above, in the first squeegee 100, the first contact portion 130 can fill the paste 192 into the opening 184 of the screen plate 182 and press the filled paste 192 against the printed material 180 side. Further, the residual paste 194 can be scraped off by the second contact portion 140.

  Therefore, by performing screen printing using the first squeegee 100, separation between the screen plate 182 and the substrate 180 is facilitated in the subsequent plate separation process.

  Further, since the first squeegee 100 is moved once (one forward pass), the two portions of the first contact portion 130 and the second contact portion 140 are continuously in contact with the screen plate 182. The paste 192 filled in the openings 184 </ b> A and 184 </ b> B of the 182 can be surely pressed toward the substrate 180. As a result, “printing unevenness” is suppressed.

  Due to such an effect, it is possible to perform high-quality printing by performing screen printing using the first squeegee 100.

(Another squeegee according to an embodiment of the present invention)
Next, another squeegee according to an embodiment of the present invention will be described with reference to FIG.

  FIG. 6 shows a schematic side view (enlarged view) of another squeegee for screen printing (hereinafter referred to as “second squeegee”) according to an embodiment of the present invention.

  As shown in FIG. 6, the second squeegee 200 has the same form as the first squeegee 100 described above. Therefore, in FIG. 6, the same reference numerals as those shown in FIG. 2 plus 100 are used for the same parts as the first squeegee 100.

  However, the second squeegee 200 is different from the first squeegee 100 in the form of the first inclined surface 260 at the bottom 214.

  That is, the first inclined surface 260 of the second squeegee 200 is not a flat surface extending from the first contact portion 230 to the front end 220 but a curved surface connecting the two.

  In this case, the angle θ1 of the first contact portion 230 is defined as follows.

  As shown in FIG. 6, a tangent line 260A passing through the first contact portion 230 is drawn on the first inclined surface 260 (this tangent line 260A is actually a plane extending in the depth direction). An angle formed by the tangent 260A and the outer plane Pa is defined as a first angle θ1 (where 0 <θ1 <90 °). The outer plane Pa is defined as described above.

  Thus, the 1st inclined surface 260 does not necessarily need to be comprised with a single plane, but it is a 1st or 2 or more with a several plane, a single curved surface, a several curved surface, or 1 or 2 or more planes. The curved surface may be combined. In addition, for example, the front end 220 may be formed in a round shape.

  When the surface intersecting the first contact portion 230 is a curved surface, the angle θ1 of the first contact portion 230 is defined in consideration of the tangent line 260A passing through the first contact portion 230 as described above. .

  Such a second squeegee 200 can provide the same effects as the first squeegee 100 when used for screen printing.

  That is, it is possible to fill the opening of the screen plate with the first contact portion 230 and press the filled paste against the side of the substrate. Further, the second contact portion 240 can scrape the residual paste on the screen plate.

  In addition, since the two locations of the first contact portion 230 and the second contact portion 240 are continuously brought into contact with the screen plate by one movement (one forward pass), the paste filled in the opening of the screen plate Can be reliably pressed by the substrate.

  As a result, it is easy to release the plate, and printing with less “printing unevenness” can be performed.

(Another squeegee according to an embodiment of the present invention)
Next, still another squeegee according to an embodiment of the present invention will be described with reference to FIG.

  FIG. 7 shows a schematic side view (enlarged view) of another squeegee for screen printing (hereinafter referred to as “third squeegee”) according to an embodiment of the present invention.

  As shown in FIG. 7, the third squeegee 300 has the same form as the first squeegee 100 described above. Therefore, in FIG. 7, the same reference numerals as those of the first squeegee 100 are used with reference numerals obtained by adding 200 to the reference numerals shown in FIG.

  However, the third squeegee 300 is different from the first squeegee 100 in the form of the transition portion 350 in the bottom portion 314.

  That is, in the transition part 350 of the third squeegee 300, the second connecting surface 354 intersecting with the second contact part 340 is not a flat surface but a curved surface (in the example of FIG. 7, a concave surface).

  In this case, the angle θ2 of the second contact portion 340 is defined as follows.

  As shown in FIG. 7, a tangent line 354A passing through the second contact portion 340 is drawn with respect to the second connecting surface 354 (this tangent line 354A is actually a plane extending in the depth direction). An angle formed by the tangent line 354A and the intermediate plane Pb is defined as a second angle θ2 (where 0 <θ2 <180 °). The intermediate plane Pb is defined as described above.

  In such a third squeegee 300 as well, the same effect as the first squeegee 100 can be obtained when used for screen printing.

  That is, the first contact part 330 can fill the opening of the screen plate with the paste and press the filled paste against the side of the substrate. Further, the second contact portion 340 can scrape the residual paste on the screen plate.

  Also, since the two locations of the first contact portion 330 and the second contact portion 340 are continuously brought into contact with the screen plate by one movement (one forward pass), the paste filled in the opening of the screen plate Can be reliably pressed by the substrate.

  As a result, it is easy to release the plate, and printing with less “printing unevenness” can be performed.

  The example of the configuration of the squeegee according to the embodiment of the present invention has been described above with reference to FIGS.

  However, these are merely examples, and it will be apparent to those skilled in the art that squeegees having other configurations can be envisaged in the present invention.

  For example, in the second squeegee 200 illustrated in FIG. 6, the transition portion 250 includes a planar first coupling surface 252 and a planar second coupling surface 254. However, at least one of the first connecting surface 252 and the second connecting surface 254 may be a curved surface.

  The transition portion 250 further includes one or more additional portions other than the first connection surface 252 and the second connection surface 254, and these additional portions are curved surfaces even if they are flat surfaces. Also good. For example, the second connection surface 254 may have a concave surface like the second connection surface 354 of the third squeegee 300 shown in FIG.

  Further, the second inclined surface 262 does not necessarily have a flat shape, and may have a curved surface shape.

  Further, the front tip 220 and / or the rear tip 224 may be round.

  The same can be said for the third squeegee 300 shown in FIG.

(Other features of the squeegee according to one embodiment of the present invention)
Next, other features of the squeegee according to one embodiment of the present invention will be described. Here, as an example, the characteristics of the first squeegee 100 shown in FIGS. 1 and 2 will be described. Therefore, when referring to each part of the squeegee, the reference numerals used in FIGS. 1 and 2 are used.

(Size)
The thickness (the dimension in the X direction in FIG. 1) of the first squeegee 100 is, for example, in the range of 9 mm to 30 mm. The width (the dimension in the Y direction in FIG. 1) of the first squeegee 100 is, for example, in the range of 50 mm to 2500 mm. The height (dimension in the Z direction in FIG. 1) of the first squeegee 100 is, for example, in the range of 20 mm to 150 mm.

  The aforementioned first angle θ1 is, for example, in the range of 15 ° to 80 °, and preferably in the range of 30 ° to 60 °. On the other hand, the second angle θ2 is, for example, in the range of 80 ° to 130 °, and preferably in the range of 90 ° to 120 °.

  The distance (dimension in the X direction) from the first contact portion 130 to the front surface 110 is, for example, in the range of 3 mm to 15 mm. Further, the distance (dimension in the X direction) from the second contact portion 140 to the rear surface 112 is, for example, in the range of 3 mm to 15 mm.

  Moreover, the difference of the dimension of the height direction (Z direction) of the 1st contact part 130 and the 2nd contact part 140 is the range of 2 mm-15 mm, for example. In contrast, the distance in the thickness direction (X direction) from the first contact portion 130 to the second contact portion 140 (see ΔX in FIG. 2) is, for example, in the range of 2 mm to 20 mm.

(Material)
The first squeegee 100 is made of a rubber material. The rubber material is not particularly limited, and may be, for example, natural rubber, chloroprene rubber, ethylene propylene diene rubber (EPDM), urethane rubber, silicon rubber, fluorine rubber, and butyl rubber. Among these, urethane rubber and silicon rubber are preferable.

  Note that the first squeegee 100 does not necessarily need to be made of a single material.

  For example, as shown in FIG. 8, the first squeegee 100 may be configured by bonding the first rubber member 101A and the second rubber member 102A together in the YZ plane.

  In this case, the first rubber member 101A constitutes the front surface 110 of the first squeegee 100 and a part of the bottom portion 114, and the second rubber member 102A includes the rear surface 112 of the first squeegee 100 and the bottom portion. 114.

  For example, in the example illustrated in FIG. 8, the first rubber member 101 </ b> A configures a portion from the front end 120 to the first connection surface 152 of the transition portion 150 in the bottom portion 114. Further, the second rubber member 102 </ b> A constitutes a portion of the bottom 114 from the second connection surface 154 of the transition portion 150 to the rear end tip 124.

  Alternatively, as shown in FIG. 9, the first squeegee 100 may be configured by bonding the first rubber member 101B to the third rubber member 103B together on the YZ plane.

  In this case, the first rubber member 101 </ b> B constitutes a portion from the front end 120 to the first contact portion 130 in the bottom portion 114. Further, the second rubber member 102 </ b> B constitutes a portion from the first contact portion 130 to the first connecting surface 152 in the bottom portion 114. Further, the third rubber member 103 </ b> B constitutes a portion of the bottom 114 from the second connecting surface 154 of the transition portion 150 to the rear end 124.

  In addition, the first squeegee 100 may be configured by various combinations of a plurality of rubber members.

  Thus, when the 1st squeegee 100 is comprised with the some rubber member, manufacture becomes comparatively easy.

  Further, the rubber hardness can be changed between the first contact portion 130 and the second contact portion 140. For example, a relatively elastic rubber member can be used for the first contact portion 130, and a relatively rigid rubber member can be used for the second contact portion 140.

  In this case, the filling and pressing of the paste by the first contact portion 130 and / or the scraping of the residual paste by the second contact portion 140 can be performed more efficiently.

  For example, the rubber hardness of the rubber members 101A, 101B, and 102B constituting the first contact portion 130 may be in the range of 60 degrees to 80 degrees. On the other hand, the rubber hardness of the rubber members 102A and 103B constituting the second contact portion 140 may be in the range of 80 degrees to 100 degrees.

  In addition, in this application, "rubber hardness" means the hardness of the rubber member measured using a rubber hardness meter based on JIS K6253-2002.

(Another squeegee according to an embodiment of the present invention)
Next, still another squeegee according to an embodiment of the present invention will be described with reference to FIG.

  FIG. 10 shows a schematic side view (enlarged view) of another squeegee for screen printing (hereinafter referred to as “fourth squeegee”) according to an embodiment of the present invention.

  As shown in FIG. 10, the fourth squeegee 400 has the same form as the first squeegee 100 described above. Therefore, in FIG. 10, the same reference numerals as those of the first squeegee 100 are added with the reference numerals shown in FIG.

  However, the fourth squeegee 400 is different from the first squeegee 100 in the form of the bottom portion 414.

  More specifically, the bottom 414 of the fourth squeegee 400 has a front tip 420 that intersects the front surface 410 and a rear tip 424 that intersects the rear surface 412. Between the rear end 424, a first contact portion 430, a second contact portion 440, and a third contact portion 442 are provided. The first contact portion 430 is provided closer to the front end 420 than the second contact portion 440. Further, the third contact portion 442 is provided between the first contact portion 430 and the second contact portion 440.

  The first contact portion 430, the second contact portion 440, and the third contact portion 442 are arranged such that when the fourth squeegee 400 is used for screen printing, the fourth squeegee 400 becomes a screen plate. Corresponds to the point of contact.

  The bottom portion 414 further includes a first transition portion 444 that connects both contact portions between the first contact portion 430 and the third contact portion 442. In addition, the bottom portion 414 includes a second transition portion 445 that connects both contact portions between the third contact portion 442 and the second contact portion 440.

  The first transition portion 444 includes a first connecting surface 452 that intersects the first contact portion 430 and a third connecting surface 453 that intersects the third contact portion 442. The second transition portion 445 includes a fourth connection surface 456 that intersects with the third contact portion 442 and a second connection surface 454 that intersects with the second contact portion 440.

  Further, the bottom portion 414 has a first inclined surface 460 extending from the first contact portion 430 toward the front tip 420 and a second inclined surface 460 extending from the second contact portion 440 toward the rear tip 424. And an inclined surface 462.

  Here, in the fourth squeegee 400, a plane passing through the first contact portion 430, the third contact portion 442, and the second contact portion 440 is denoted by P. Further, in the plane P, a portion from the first contact portion 430 to the third contact portion 442 is referred to as a first intermediate plane P1, and a portion from the third contact portion 442 to the second contact portion 440 is referred to as a first portion. 2 is referred to as an intermediate plane P2, and a portion closer to the front surface 410 than the first contact portion 430 is referred to as an outer plane Pa.

  Furthermore, the angle formed between the first inclined surface 460 and the outer plane Pa is the first angle θ1 (0 <θ1 <90 °), and the angle formed between the second connecting surface 454 and the second intermediate plane P2 is The second angle θ2 (0 <θ2 <180 °) is defined, and the angle formed by the third connecting surface 453 and the first intermediate plane P1 is defined as a third angle θ3 (0 <θ2 <180 °). .

  In this case, the fourth squeegee 400 has a feature that the second angle θ2 is larger than the first angle θ1.

  In the example shown in FIG. 10, the third angle θ3 is between the first angle θ1 and the second angle θ2, that is, θ1 <θ3 <θ2.

  However, this is merely an example, and the third angle θ3 can be arbitrarily determined. For example, the third angle θ3 may be equal to or greater than the second angle θ2 (that is, θ3 ≧ θ2). Alternatively, the third angle θ3 may be equal to or less than the first angle θ1 (that is, θ3 ≦ θ1).

  However, it is preferable that the third angle θ3 is between the first angle θ1 and the second angle θ2.

  In the fourth squeegee 400 having such a configuration, during screen printing, the first contact portion 430 fills the opening of the screen plate with the paste and presses the filled paste against the side of the substrate to be printed. it can. In addition, the third contact portion 442 can more reliably press the paste filled in the opening of the screen plate against the substrate. Furthermore, residual paste on the screen plate can be scraped off by the second contact portion 240.

  Therefore, by performing screen printing using the fourth squeegee 400, separation between the screen plate and the printing material is facilitated in the subsequent plate separation process.

  The fourth squeegee 400 is moved once (one way), and the first contact portion 430, the third contact portion 442, and the second contact portion 440 are continuously connected to the screen plate. Abut. For this reason, the paste with which the opening of the screen plate was filled can be surely pressed by the substrate. As a result, “printing unevenness” is further suppressed.

  With such an effect, when screen printing is performed using the fourth squeegee 400, high-quality printing can be performed.

(Other features)
Next, other features of the fourth squeegee 400 shown in FIG. 10 will be described.

(Size)
The thickness (the dimension in the X direction in FIG. 10) of the fourth squeegee 400 is, for example, in the range of 9 mm to 30 mm. The width (the dimension in the Y direction in FIG. 1) of the first squeegee 100 is, for example, in the range of 50 mm to 2500 mm. The height (dimension in the Z direction in FIG. 1) of the first squeegee 100 is, for example, in the range of 20 mm to 150 mm.

  In the 4th squeegee 400, 1st angle (theta) 1 is the range of 15 degrees-80 degrees, for example, and it is preferable that it is the range of 30 degrees-60 degrees. The third angle θ3 is, for example, in the range of 45 ° to 90 °, and preferably in the range of 50 ° to 80 °. On the other hand, the second angle θ2 is, for example, in the range of 80 ° to 130 °, and preferably in the range of 90 ° to 120 °.

  The distance in the X direction from the first contact portion 430 to the front surface 410 is, for example, in the range of 6 mm to 20 mm. Moreover, the distance of the X direction from the 2nd contact part 440 to the rear surface 412 is the range of 3 mm-10 mm, for example. The distance in the X direction from the third contact portion 442 to the first contact portion 430 is in the range of 3 mm to 10 mm, and the distance in the X direction from the third contact portion 442 to the second contact portion 440 is. Is in the range of 3 mm to 10 mm.

  Moreover, the difference in the dimension of the height direction (Z direction) of the 1st contact part 430 and the 3rd contact part 442 is the range of 2 mm-10 mm, for example. On the other hand, the difference in dimension in the height direction (Z direction) between the third contact portion 442 and the second contact portion 440 is, for example, in the range of 2 mm to 10 mm. In addition, the difference of the dimension of the height direction (Z direction) of the 1st contact part 430 and the 2nd contact part 440 is the range of 4 mm-20 mm, for example.

(Material)
The fourth squeegee 400 is made of the rubber material as described above.

  Note that the fourth squeegee 400 does not necessarily need to be made of a single material. That is, as described above, the fourth squeegee 400 may be configured by bonding a plurality of rubber members.

  When the fourth squeegee 400 is constituted by a plurality of rubber members, the manufacturing becomes relatively easy.

  In this case, the rubber hardness can be changed in each of the contact portions 430, 440, and 442. For example, a relatively elastic rubber member is used in the first contact portion 430, a relatively rigid rubber member is used in the second contact portion 440, and both of them are used in the third contact portion 442. A rubber member having an intermediate rubber hardness can be used.

  For example, the rubber hardness of the rubber member constituting the first contact portion 430 is in the range of 60 to 80 degrees, and the rubber hardness of the rubber member constituting the third contact portion 442 is in the range of 70 to 90 degrees. And the rubber hardness of the rubber member which comprises the 2nd contact part 440 can be made into the range of 80 to 100 degree | times.

  In this case, the filling and pressing of the paste by the first contact portion 430, the pressing of the paste by the third contact portion 442, and / or the scraping of the residual paste by the second contact portion 440 are performed more efficiently. Is possible.

  The configuration and characteristics of the squeegee according to the embodiment of the present invention have been described above using the first to fourth squeegees as examples.

  However, these configurations are merely examples, and the squeegee in the present invention may have other configurations as long as the above-described effects can be exhibited.

  For example, in the fourth squeegee 400, the bottom 414 may have one or more curved surfaces as shown with reference to FIGS. 6 and 7, for example.

  Here, when the 3rd connection surface 453 is comprised by a curved surface, 3rd angle (theta) 3 is prescribed | regulated as follows.

  A tangent line passing through the third contact portion 442 (actually, this tangent line is a plane extending in the depth direction) is drawn with respect to the third connecting surface 453. A third angle θ3 is determined from an angle formed by the tangent line and the first intermediate plane P1.

  By the way, the screen printing method is roughly classified into two types: a “contact type” and a “non-contact type”.

  In the “contact type”, the screen plate is disposed so as to be in close contact with the substrate. Usually, the screen plate is made of a metal having a plurality of openings.

  On the other hand, in the “non-contact type”, the screen plate is disposed so as to have a predetermined clearance between the screen plate and the substrate. A screen plate having a mesh is used as the screen plate.

  In the “non-contact type”, when the squeegee is pressed against the screen plate, the pressing plate deforms the screen plate, and the screen plate comes into contact with the substrate only under the squeegee. Further, with the movement of the squeegee, the contact portion between the screen plate and the printing material is continuously moved and printing is performed.

  In the above description, the characteristics of the squeegee according to one embodiment of the present invention have been described with the “contact system” in mind. However, it will be apparent to those skilled in the art that a squeegee according to an embodiment of the present invention can be used in a “non-contact” screen printing method as well.

DESCRIPTION OF SYMBOLS 100 1st squeegee 101A, 102A, 101B, 102B, 103B Rubber member 110 Front surface 112 Rear surface 114 Bottom part 120 Front front end 124 Rear front end 130 First contact part 140 Second contact part 150 Transition part 152 First connection surface 154 Second connecting surface 160 First inclined surface 162 Second inclined surface 180 Printed object 182 Screen plate 184A, 184B Opening 192 Paste 193 Paste 194 Residual paste 200 Second squeegee 210 Front surface 212 Rear surface 214 Bottom portion 220 Front end 224 Rear tip 230 First contact portion 240 Second contact portion 250 Transition portion 252 First connecting surface 254 Second connecting surface 260 First inclined surface 260A Tangent 262 Second inclined surface 300 Third squeegee 310 Front 312 Rear 314 Bottom 3 20 Front tip 324 Rear tip 330 First contact portion 340 Second contact portion 350 Transition portion 352 First connecting surface 354 Second connecting surface 354A Tangent 360 First inclined surface 362 Second inclined surface 400 First Four squeegees 410 Front 412 Rear 414 Bottom 420 Front tip 424 Rear tip 430 First contact 440 Second contact 442 Third contact 444 First transition 445 Second transition 452 First Connection surface 453 Third connection surface 454 Second connection surface 456 Fourth connection surface 460 First inclined surface 462 Second inclined surface P plane Pa Outer plane Pb Intermediate plane P1 First intermediate plane P2 Second intermediate plane

Claims (7)

A squeegee for screen printing,
In screen printing, the front surface corresponding to the front side of the moving direction with respect to the screen plate, the rear surface corresponding to the rear side of the moving direction, and the bottom portion facing the screen plate,
The bottom has a front tip at the intersection with the front surface, and has a rear tip at the intersection with the rear surface,
The bottom portion has a first contact portion and a second contact portion that come into contact with the screen plate during screen printing, and the first contact portion is closer to the front surface,
The bottom portion further includes a first inclined surface extending from the first contact portion toward the front end, and a second inclination extending from the second contact portion toward the rear end. And having a surface,
A transition portion exists between the first contact portion and the second contact portion,
In the transition portion, a surface intersecting with the first contact portion is referred to as a first connection surface, a surface intersecting with the second contact portion is referred to as a second connection surface,
In the plane P passing through the first contact portion and the second contact portion, a portion from the first contact portion to the second contact portion is referred to as an intermediate plane Pb. The portion on the front side of the plane Pb is referred to as an outer plane Pa,
The angle between the first inclined surface and the outer plane Pa is θ1 (0 <θ1 <90 °), and the angle between the second connecting surface and the intermediate plane Pb is θ2 (0 <θ2 <180). °)
θ2 is a squeegee larger than θ1. The squeegee according to claim 1, wherein the θ1 is in a range of 15 ° to 80 ° and / or the θ2 is in a range of 80 ° to 130 °.   The squeegee according to claim 1 or 2, wherein the squeegee is made of a rubber material.   The squeegee according to claim 3, wherein the squeegee is made of a single rubber material. The squeegee includes a first rubber member including the first contact portion;
A second rubber member including the second contact portion,
The squeegee according to claim 3, wherein the first rubber member has a rubber hardness lower than that of the second rubber member. The bottom further has a third contact portion that contacts the screen plate during screen printing,
The squeegee according to any one of claims 1 to 5, wherein the third contact portion is located between the first contact portion and the second contact portion. The transition section includes a first transition section and a second transition section, and the first transition section exists between the first contact section and the third contact section, and the second transition section The transition part is present between the third contact part and the second contact part,
In the first transition portion, a surface intersecting with the third contact portion is referred to as a third connection surface, and in the second transition portion, a surface intersecting with the third contact portion is defined as a fourth connection surface. Call
The plane P passes through the third contact portion, and a portion of the plane P from the first contact portion to the third contact portion is referred to as a first intermediate plane P1, and the third contact portion To the second contact portion is referred to as a second intermediate plane P2,
When the angle formed by the third connecting surface and the first intermediate plane P1 is a third angle θ3 (0 <θ3 <180 °),
The squeegee according to claim 6, wherein the θ3 is between the θ1 and θ2.

Images