TW201615430A - Screen printing scraper - Google Patents

Abstract

A screen printing scraper is described. The screen printing scraper includes a connecting base, a squeegee holder and a squeegee. The connecting base has a bottom surface. The squeegee holder is disposed under the bottom surface of the connecting base. The squeegee is fixed to a bottom of the squeegee holder, and a bottom of the squeegee has a tip. The squeegee holder and the squeegee can rotate in relation to the connecting base with the tip as a rotation center. With such design, an attack angle of the squeegee can be adjusted, and the tip of the squeegee is in line with an action force of a squeegee cylinder, so that an axis of the action force is not changed while the attack angle of the squeegee is adjusted, thereby achieving an exactly pressuring effect during a screen printing process.

Description

Screen printing scraper

This invention relates to a doctor blade, and more particularly to a screen printing blade.

In recent years, the electronics industry has applied many printing technologies to manufacture electronic products. For example, electronic components are fabricated by printing techniques, printed on a circuit board, or coated with ink or paste during a bonding process. Among the many printing technologies, Screen Printing technology has been widely used in the surface processing of various articles.

However, the current screen printing technology is unable to achieve the fine line width and fine line spacing, and is greatly limited in application, so the application level of the screen printing technology cannot be effectively improved. One of the reasons why screen printing technology cannot effectively reduce the print line width and line spacing is that the screen printing blade technology still has problems to be overcome. The conventional scraper is absorbed by the deformation of the partial pressure due to the scraping, so that the printing press control is difficult. In addition, when the printing conditions have to increase the downforce, the softer squeegee deforms, which affects the attack angle of the squeegee, which in turn causes the angle of the attack angle to be unstable, resulting in a decrease in printing stability.

In addition, another scraper technique proposes that the scraper technique shortens the length of the scraper and replaces a portion of the scraper with an elastic plate. The elastic plate is used to provide stable rigidity, and the unevenness between the screen and the printed matter is from the front. The end of the scraping rubber is elastic to absorb. As a result, even if the pressing pressure of the printing is different, the blade still has a stable attack angle. However, since the downforce of the current press pressure is provided by a cylinder or a servo motor, and the angle of attack of the scraper is adjusted, the associated force also changes the axis of the force, causing the force axis to shift at an angle, thereby causing the When the scraper is actually used in the printing of fine lines, the printing effect cannot be effectively improved, and the printing performance is not as expected.

Therefore, an object of the present invention is to provide a screen printing blade, wherein the squeegee fixing seat and the squeegee can rotate the tip of the bottom of the squeegee as a rotation axis, thereby adjusting the angle of the squeegee attack angle. To adapt to the needs of various screen printing.

Another object of the present invention is to provide a screen printing blade in which the squeegee is held by the joint base and the squeegee holder, thereby shortening the length of the squeegee. The shortening of the length of the squeegee increases the rigidity of the squeegee as a whole, thereby improving the problem that the thickness of the printing film is affected by the change in the blade pressure. In addition, since the squeegee is a consumable in the screen printing blade, the shortening of the squeegee length can reduce the cost of the consumable.

Another object of the present invention is to provide a screen printing blade whose squeegee tip is in line with the blade cylinder force, and the force axis is not changed by adjusting the attack angle of the squeegee, so during the screen printing process , can achieve the effect of precise pressure.

Still another object of the present invention is to provide a screen printing blade which mainly uses the elastic properties of the blade itself, and the rigidity required for screen printing is provided by the blade holder and the connection base. Therefore, the rigidity of the scraping rubber can be avoided. The effect of the foot can further improve the stability of the printing quality.

According to the above object of the present invention, a screen printing blade is proposed. This screen printing blade includes a connection base, a wiper mount, and a wiper. The connection base has a bottom surface. The squeegee fixing seat is disposed under the bottom surface of the connecting base. The squeegee is fixed on the bottom of the squeegee fixing seat, and the bottom of the squeegee has a tip end. The squeegee holder and the squeegee can be rotated relative to the connection base by the tip end of the rotation axis.

According to an embodiment of the invention, the squeegee fixing seat has a top surface corresponding to the bottom surface of the connecting base.

According to another embodiment of the present invention, the bottom surface of the connecting base is a concave curved surface, and the top surface of the scraping fixing seat is a convex curved surface, and the concave curved surface has the same curvature as the convex curved surface.

According to still another embodiment of the present invention, one side of the squeegee fixing seat is provided with an angle adjusting scale adjacent to the top surface.

According to still another embodiment of the present invention, the center line of one side of the connecting base is provided with an index adjacent to the bottom surface and above the angle adjustment scale.

According to still another embodiment of the present invention, the screen printing blade further includes at least one locking component and at least one bonding component. The connecting base is provided with at least one perforation. The coupling element is provided with a locking hole, and the locking element can be locked in the locking hole correspondingly through the through hole. The squeegee fixing seat has at least one groove penetrating in the top surface, the groove extending in a direction substantially perpendicular to the length direction of the squeegee, and the coupling member is slidably disposed in the groove.

According to still another embodiment of the present invention, the groove has a first sliding portion and a second sliding portion that communicate with each other, and the second sliding portion is located at the first sliding portion. The second sliding portion is narrower than the first sliding portion, and the coupling member is slidably disposed in the first sliding portion.

100‧‧‧ Screen printing blade

102‧‧‧Connecting base

104‧‧‧Scrape holder

106‧‧‧Squeegee

108‧‧‧ bottom

110‧‧‧ top surface

112‧‧‧ side

114‧‧‧ tip

116‧‧‧Perforation

118‧‧‧ Groove

120‧‧‧First sliding part

122‧‧‧Second sliding part

124‧‧‧Extension direction

126‧‧‧ Length direction

128‧‧‧ side

130‧‧‧ indicators

132‧‧‧ Angle adjustment scale

134‧‧‧Locking components

136‧‧‧Combined components

138‧‧‧Lock hole

140‧‧‧ sloped surface

142‧‧‧ sloped surface

144‧‧‧Printing direction

146‧‧‧force axis

148‧‧‧Clamping Department

150‧‧‧Clamping Department

152‧‧‧ cylinder

Θ‧‧‧ angle

Ψ‧‧‧角角

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.

1 is a schematic view showing the assembly of a screen printing blade according to an embodiment of the present invention.

2 is a front elevational view of a screen printing blade in accordance with an embodiment of the present invention.

3 is a schematic view showing an adjustment of a screen printing blade according to an embodiment of the present invention.

4 is a schematic view showing another adjustment of a screen printing blade according to an embodiment of the present invention.

Fig. 5 is a graph showing the relationship between the scraping hardness, the printing pressure and the film thickness of a conventional doctor blade and a screen printing blade according to an embodiment of the present invention.

Please refer to FIG. 1 and FIG. 2 simultaneously, which are respectively assembled and front view of a screen printing blade according to an embodiment of the present invention. In the present embodiment, the screen printing blade 100 can be applied in a screen printing process to match a screen to print a desired pattern structure on a to-be-printed object. In some embodiments, the screen printing blade 100 primarily includes a connection base 102, a wiper mount 104, and a wiper 106.

The connection base 102 is a member of the screen printing blade 100 that is coupled to a cylinder or servo motor that supplies printing pressure. In an exemplary embodiment, as shown in FIG. 2, the connection base 102 is coupled to the cylinder 152. The length of the attachment base 102 is matched to the wiper 106 and is typically slightly longer than the wiper 106. In some examples, as shown in Fig. 1, since the squeegee 106 is elongated, the connection base 102 is also elongated. The connection base 102 has a bottom surface 108 and a side surface 128 that abut each other. In some exemplary examples, the bottom surface 108 can be, for example, a concave curved surface. In addition, the connection base 102 can be provided with one or more perforations 116, wherein the perforations 116 extend through the connection base 102 from top to bottom to facilitate the connection of the connection base 102 to the wiper mount 104. The material of the connection base 102 can be, for example, a metal.

The squeegee mount 104 is disposed under the bottom surface 108 of the connection base 102. The wiper mount 104 has a top surface 110 and a side surface 112 that abut each other. In some examples, when the squeegee mount 104 is disposed under the bottom surface 108 of the pedestal 102, the top surface 110 of the squeegee mount 104 is coupled to the bottom surface 108 of the pedestal 102, such as the squeegee mount 104. The top surface 110 is attached to the bottom surface 108 of the connection base 102 as shown in FIG. In an exemplary embodiment, since the bottom surface 108 of the connection base 102 is a concave curved surface, the top surface 110 of the squeegee mount 104 is a convex curved surface, and the bottom surface 108 of the connection base 102 and the top of the squeegee mount 104 are The faces 110 have the same curvature so that the bottom surface 108 of the attachment base 102 can be tightly coupled to the top surface 110 of the wiper mount 104, thereby increasing the stability of the screen printing process. The material of the squeegee mount 104 can be, for example, a metal.

In some examples, please refer to Figure 1 again, the scraper mount One or more recesses 118 may be provided, wherein the recesses 118 are transversely disposed in the top surface 110 of the wiper mount 104, that is, the direction of extension 124 of the recesses 118 is substantially perpendicular to the length direction 126 of the wiper 106. In such an example, the screen printing blade 100 can include at least one locking element 134 and at least one coupling element 136. The coupling element 136 is embedded in the recess 118 of the wiper mount 104 and is slidable within the recess 118. The coupling member 136 is provided with a locking hole 138, and the locking member 134 can be locked in the locking hole 138 of the coupling member 136 through the through hole 116 of the coupling base 102 for the purpose of combining with the coupling member 136. The connection base 102 and the wiper mount 104 can be further combined by the combination of the lock member 134 and the coupling member 136.

In some exemplary examples, the groove 118 has a first sliding portion 120 and a second sliding portion 122 , wherein the second sliding portion 122 is located on the first sliding portion 120 and communicates with the first sliding portion 120 . Further, the width of the second sliding portion 122 is narrower than the width of the first sliding portion 120. In some exemplary examples, the side view shape of the recess 118 may be convex-like, as shown in FIG. In such an exemplary embodiment, the coupling member 136 is embedded in the first sliding portion 120 of the recess 118 and slidably disposed in the first sliding portion 120, and the locking member 116 is sequentially passed through the connecting base 102. The through hole 116 and the second sliding portion 122 are locked in the locking hole 138 of the coupling member 136 located in the first sliding portion 120. As such, when the coupling member 136 slides in the first sliding portion 120, the locking member 116 slides in the second sliding portion 122. Furthermore, since the second sliding portion 122 is narrower than the first sliding portion 120 and the coupling member 136 is wider than the second sliding portion 122, the coupling member 136 can be defined in the first sliding portion 120 by such a design.

In some examples, the side 112 of the wiper mount 104 can optionally be provided with an angle adjustment scale 132 that is preferably adjacent to the top surface 110 of the wiper mount 104. On the other hand, an index 130 may be provided on the center line of the side surface 128 of the connection base 102, and the indicator 130 is located above the angle adjustment scale 132 of the wiper mount 104. The index 130 can indicate a corresponding adjustment angle on the angle adjustment scale 132 according to the rotation of the wiper mount 104 relative to the connection base 102. The index 130 is preferably adjacent to the bottom surface 108 of the connection base 102 to facilitate adjustment of the angle of the wiper mount 104 using the index 130 and the angle adjustment scale 132.

The squeegee 106 can be fixed to the bottom of the squeegee mount 104. As shown in FIGS. 1 and 2, in some exemplary examples, the wiper mount 104 may further include clips 148 and 150, and the wiper 106 may be sandwiched between the clips 148 and 150. The squeegee 106 can be made of a polymer material. In some examples, as shown in FIG. 2, before the squeegee 106 is mounted on the squeegee mount 104, the slanted faces 140 and 142 may be pre-polished at the bottom of the squeegee 106 according to the requirements of the screen printing process. The angle θ between the inclined surface 140 facing forward in the printing direction 144 and the plane of the object to be printed is the attack angle of printing. Moreover, one side of the two inclined faces 140 and 142 of the bottom of the squeegee 106 are in contact with each other, and a tip end 114 is formed at the bottom of the squeegee 106. The angle φ between the two inclined faces 140 and 142 is the angle of the tip end 114. . In an exemplary example, the angle ψ between the inclined faces 140 and 142 may be 90 degrees to increase the screen release effect.

In the screen printing process, since the fixed blade angle (that is, the fixed attack angle) cannot meet all the printing conditions, it is necessary to adjust the actual printing. The angle of attack of the entire scraper is such that the print quality meets the requirements. However, in the conventional blade design, once the attack angle of the squeegee is changed, the force axis of the cylinder pressure is changed, so that the squeegee is reduced in rigidity due to the component force relationship.

However, in the design of the screen printing blade 100 of the present embodiment, the blade holder 104 can be rotated relative to the connection base 102 with the tip end 114 of the blade 106 as the rotation axis, thereby adjusting the blade 106. The angle of attack at the time of printing. Please refer to FIG. 1 to FIG. 4 together, wherein FIG. 3 and FIG. 4 respectively illustrate two adjustment diagrams of a screen printing blade according to an embodiment of the present invention. In Fig. 2, the wiper mount 104 and the wiper 106 are erected without rotating relative to the base 102.

When the printing attack angle required for the screen printing process needs to be reduced, for example, at 7.5 degrees as shown in FIG. 3, the locking member 116 shown in FIG. 1 can be loosened first, so that the connecting base 102 and the squeegee are fixed. The seats 104 are relatively movable between each other. Referring again to the index 130 of the connection base 102 and the angle adjustment scale 132 of the squeegee mount 104, with the tip end 114 of the squeegee 106 as the rotation axis, the combination of the squeegee mount 104 and the squeegee 106 is connected with respect to the connection. The base 102 is rotated 7.5 degrees counterclockwise. Then, the locking member 116 is tightened to fix the relative position of the blade holder 104 and the connection base 102, and the reduction of the printing attack angle of the screen printing blade 100 is completed, as shown in FIG.

On the other hand, when the printing attack angle required for the screen printing process needs to be increased, for example, when the negative printing angle shown in FIG. 4 is 7.5 degrees, the locking member 116 shown in FIG. 1 is also loosened first, so that the connecting base is connected. The 102 is movable relative to the wiper mount 104. Referring again to the index 130 connecting the base 102 and the angle of the wiper mount 104, the scale 132 is adjusted to the tip end 114 of the wiper 106. To rotate the spindle, the combination of the wiper mount 104 and the wiper 106 is rotated 7.5 degrees clockwise relative to the base 102. Then, the locking member 116 is tightened to fix the relative position of the blade holder 104 and the connection base 102, and the adjustment of the printing attack angle of the screen printing blade 100 is completed, as shown in FIG.

As can be seen from FIG. 2 to FIG. 4, since the screen printing blade 100 can adjust the attack angle with the tip end 114 of the squeegee 106 as the rotation axis, the screen printing blade 100 can be adjusted within an adjustable angle range. The force axis (through tip 114) 146 does not change. In this way, the stability of the blade angle and the printing pressure during screen printing can be greatly improved, thereby increasing the uniformity of the printing film thickness and achieving the effect of fine line printing.

Please refer to FIG. 5, which is a graph showing the relationship between the scraping hardness, the printing pressure and the film thickness of the conventional doctor blade and the screen printing blade according to an embodiment of the present invention. In general, greater printing pressure (i.e., pressure applied to the doctor blade) results in a thinner printed film thickness. However, from the actual experimental results in Fig. 5, it can be seen that the screen printing results obtained by the conventional doctor blade hardness (Shore hardness) of 60 degrees, 70 degrees and 80 degrees are not the same. For example, as shown in Fig. 5, when the scraper hardness of the conventional scraper is 70 degrees, the thickness of the printed film is nonlinearly thinned, and when the printing pressure is increased to 0.40 mPa, the thickness of the printed film is changed. thick. Therefore, the relationship between the printing pressure of the conventional doctor blade and the film thickness does not change nonlinearly and is not predictable.

On the other hand, please refer to FIG. 5 again, in the case where the squeegee hardness of the screen printing blade of the embodiment of the present invention is 70 degrees, due to the screen printing scraping The knife has a fixed force axis such that the relationship between the printed film thickness and the printing pressure exhibits a fairly linear change. Therefore, when the screen printing blade of the embodiment of the present invention is used, the thickness of the printed film is not changed by changing the pressure applied under the blade, and the adjustment of the printing parameters is very convenient.

It can be seen from the above embodiments that one of the advantages of the present invention is that the squeegee fixing seat and the squeegee of the screen printing blade of the present invention can be rotated by the tip end of the squeegee bottom, thereby adjusting the squeegee. The angle of the attack angle is adapted to the needs of various screen printing.

As can be seen from the above embodiments, another advantage of the present invention is that since the squeegee of the screen printing blade of the present invention is held by the joint base and the squeegee holder, the length of the squeegee can be shortened. The shortening of the length of the squeegee increases the rigidity of the squeegee as a whole, thereby improving the problem that the thickness of the printing film is affected by the change in the blade pressure. In addition, since the squeegee is a consumable in the screen printing blade, the shortening of the squeegee length can reduce the cost of the consumable.

It can be seen from the above embodiments that another advantage of the present invention is that the squeegee tip of the screen printing blade of the present invention is in line with the blade cylinder force, and the force axis is not changed by adjusting the attack angle of the squeegee. Therefore, in the process of screen printing, the effect of precise pressure can be achieved.

It is a further advantage of the present invention that the screen printing blade of the present invention mainly uses the elastic properties of the squeegee itself, and the rigidity required for screen printing is provided by the squeegee fixing base and the connecting base. Therefore, the influence of the insufficient rigidity of the squeegee can be avoided, and the stability of the printing quality can be improved.

While the present invention has been described above by way of example, it is not intended to be construed as a limitation of the scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100‧‧‧ Screen printing blade

102‧‧‧Connecting base

104‧‧‧Scrape holder

106‧‧‧Squeegee

108‧‧‧ bottom

110‧‧‧ top surface

112‧‧‧ side

114‧‧‧ tip

128‧‧‧ side

130‧‧‧ indicators

132‧‧‧ Angle adjustment scale

140‧‧‧ sloped surface

142‧‧‧ sloped surface

144‧‧‧Printing direction

146‧‧‧force axis

148‧‧‧Clamping Department

150‧‧‧Clamping Department

152‧‧‧ cylinder

Θ‧‧‧ angle

Ψ‧‧‧角角

Claims (7)

A screen printing blade comprising: a connecting base having a bottom surface; a scraping fixing seat disposed under the bottom surface of the connecting base; and a scraping glue fixed to a bottom of the scraping fixing seat And one of the bottoms of the squeegee has a tip end, wherein the squeegee fixing seat and the squeegee can rotate relative to the connecting base by the tip end being a rotating axis. The screen printing blade of claim 1, wherein the squeegee holder has a top surface that is correspondingly engaged with the bottom surface of the connection pedestal. The screen printing blade according to claim 2, wherein the bottom surface of the connecting base is a concave curved surface, and the top surface of the scraping fixing seat is a convex curved surface, the concave curved surface and the convex arc The faces have the same curvature. The screen printing blade according to claim 2, wherein one side of the squeegee fixing seat is provided with an angle adjusting scale adjacent to the top surface. The screen printing blade according to claim 4, wherein an indicator on one of the side surfaces of one of the connecting bases is adjacent to the bottom surface and located above the angle adjusting scale. The screen printing blade according to claim 1, further comprising at least one locking component and at least one bonding component, wherein the connecting base is provided with at least one through hole; The coupling member is provided with a locking hole, and the locking member can be locked in the locking hole correspondingly through the through hole; and the squeegee fixing seat has at least one groove penetrating in the top surface, the One of the grooves extends in a direction substantially perpendicular to the length direction of one of the squeegees, and the coupling member is slidably disposed in the groove. The screen printing blade according to claim 6, wherein the groove has a first sliding portion and a second sliding portion that are in communication with each other, the second sliding portion is located on the first sliding portion, and the second sliding portion is The portion is narrower than the first sliding portion, and the coupling member is slidably disposed in the first sliding portion.