CN216969022U

CN216969022U - Slurry scraper for silk-screen printing

Info

Publication number: CN216969022U
Application number: CN202220321435.6U
Authority: CN
Inventors: 张国玉
Original assignee: Heli Photovoltaic Technology Shanghai Co ltd
Current assignee: Heli Photovoltaic Technology Shanghai Co ltd
Priority date: 2022-02-17
Filing date: 2022-02-17
Publication date: 2022-07-15
Anticipated expiration: 2032-02-17

Abstract

The utility model relates to a paste scraper knife for screen printing, which comprises a first member (1) and a second member (2) with the hardness smaller than that of the first member (1), wherein the first member (1) is at least covered by the second member (2) at the knife head part of the scraper knife, and an acute angle (A) is formed at one end of the knife head part, which is far away from the knife handle part of the scraper knife. The scraper knife can adopt a second component which is made of silica gel and has smaller hardness, so that the damage to the screen printing plate is reduced, and the collection of slurry by the scraper knife is facilitated; in addition, the cutter head part comprises a sharp angle part at which an acute angle is positioned, so that the slurry in the corners of the screen printing plate can be cleaned conveniently.

Description

Slurry scraper for silk-screen printing

Technical Field

The utility model relates to a slurry scraper for screen printing, in particular to a scraper for collecting and scraping slurry in the screen printing of solar cells.

Background

In laboratories and production lines in the photovoltaic industry, screen printing processes are used to produce solar cells. A movable scraper is arranged above the screen printing plate, and the scraper moves along the screen printing plate to deform the screen printing plate so as to achieve the purpose of printing the slurry on the surface of the battery piece. In the printing process, an operator needs to scrape the printing paste in the screen back with a scraper or add the paste with the scraper if necessary.

Most of the prior scraper knives used in screen printing are plastic scraper knives which are processed by processes such as injection molding, blow molding and the like, and the structures of the cutter head part and the cutter handle part are generally integrally formed. The plastic scraper knife has high hardness, and is easy to prick and explode a screen printing plate to cause plate explosion; the plastic surface is rough and not smooth, burrs are easy to exist, and the screen printing plate is easy to prick and explode; and the cutter head part of the plastic scraper knife is large in thickness, so that the slurry is not convenient to collect, and the slurry collecting efficiency is low. Plastic scraper knives also have the disadvantages of poor heat resistance, easy deformation, poor low temperature resistance, brittle fracture at low temperatures, high thermal expansion rate, poor dimensional stability, easy combustion, short service life, and the like.

In addition, printing may be performed using an automatic printing station or a manual printing station in screen printing. The printing speed of the automatic printing table is high, and the slurry is easy to splash into the corners of the screen printing plate. If the corner slurry is not thoroughly cleaned, the slurry left in the corner is then cured and dried. The dry paste is easy to move to a screen plate when being vibrated in the subsequent printing process, so that the screen mesh is damaged, and the plate is broken. Therefore, it is a problem in the art to effectively clean the slurry at the corners of the screen (e.g., the corners of a square screen).

The present invention is directed to addressing one or more of the above-mentioned problems, as well as other problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides a slurry scraper for screen printing, which comprises a first member and a second member with hardness smaller than that of the first member, wherein the first member is at least covered by the second member at the scraper head part of the scraper, and an acute angle is formed at one end of the scraper head part, which is far away from a scraper handle part of the scraper.

Illustratively, the blade head portion includes first and second straight sides extending in a longitudinal direction of the blade, and a first arc-shaped side intersecting the first and second straight sides, respectively, wherein the first arc-shaped side forms the acute angle with the first straight side.

Illustratively, the second member also encases the first member at the shank portion.

Illustratively, the length of the first member in the handle portion in a longitudinal direction of the blade is greater than half the length of the handle portion.

Illustratively, the shank portion includes, at an end thereof remote from the head portion, a third straight side extending in a direction perpendicular to a longitudinal direction of the blade, and two second arc-shaped sides intersecting the third straight side on both sides thereof, respectively.

Illustratively, the width of the portion of the first member in the shank portion is greater than the width of the portion of the first member in the head portion.

Illustratively, the width of the first member gradually increases from its one end in the tool head portion to its other end in the tool shank portion.

Illustratively, the second member is made of silicone and the first member is made of plastic.

Illustratively, the tool bit portion further comprises two third arc-shaped edges extending from the ends of the first and second straight edges, which are far away from the first arc-shaped edge, to the connection of the tool bit portion and the tool shank portion, respectively.

Illustratively, the width of the shank portion decreases from its connection with the head portion to the free end of the shank portion.

Through the scraper knife with various structures, the scraper knife has at least one of the following advantages: the scraper knife is made of the first member and the second member, and the second member with lower hardness is in contact with the screen plate, the screen mesh of the screen plate and the sizing agent on the screen plate, so that the second member with lower hardness can be selected, the screen plate is prevented from being punctured, the damage to the screen plate is reduced, the manufacturing cost is reduced, and meanwhile, the first member with higher hardness can be used for realizing the strength required by the scraper knife; the second component can be made of silica gel, has small hardness, stress rebound performance and thinner thickness, thereby avoiding the damage to the screen printing plate and being beneficial to the collection of slurry by a scraper knife; the scraper knife head part comprises a sharp corner part where an acute angle is located, so that the scraper knife can be used for cleaning slurry in the corner of the screen printing plate, the condition that the screen printing plate is damaged by dry slurry due to the fact that the slurry in the corner is not cleaned completely is avoided, and the scraper knife with the structure is particularly advantageous under the condition of automatic printing; by coating the first member with the second member over the entire scraper, possible damage to the screen due to the high hardness of the first member is further avoided, and the handle portion can also be used to contact the screen and the screen to collect slurry; the first member with higher hardness enables the shank part to have higher strength, so that the first member can be used for stirring slurry; the free end of the knife handle part comprises a straight edge extending in the transverse direction of the scraper knife and second arc-shaped edges intersecting the straight edge at the left side and the right side of the straight edge, so that the knife handle part can be used for efficiently collecting slurry; the first member and the external silica gel member can be integrally formed by injection molding, the process is simple, and the processing cost is low.

Drawings

The utility model is described in detail below by way of exemplary embodiments with reference to the accompanying drawings, in which:

FIG. 1 illustrates a front schematic view of a blade according to a first exemplary embodiment of the present disclosure; and

fig. 2 shows a front view of a blade according to a second exemplary embodiment of the utility model.

The figures are purely diagrammatic and not drawn to scale. They show only those parts which are necessary in order to clarify the utility model, while other parts may be omitted or simply mentioned. The utility model may also comprise other components than those shown in the figures.

Detailed Description

A blade according to an exemplary embodiment of the present invention is described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention to those skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Furthermore, it should be understood that the utility model is not limited to the specific embodiments described. Rather, any combination of the following features and elements, whether related to different embodiments or not, is contemplated to implement the utility model. Thus, the following features, embodiments and advantages are merely illustrative and should not be considered elements or limitations of the claims except where explicitly recited in a claim.

The utility model provides a slurry scraper for screen printing, which comprises a cutter head part 3 and a cutter handle part 4. The blade is composed of a first member 1 and a second member 2 having a hardness smaller than that of the first member 1. A first and a second embodiment according to the utility model are shown in fig. 1 and 2, respectively.

In the first embodiment shown in fig. 1, the second component 2 covers the first component 1 only at the nose portion 3 of the blade. The tool bit part 3 is composed of an upper part of the first member 1 and a second member 2 covering the outside thereof. The shank portion 4 is the lower portion of the first member 1 exposed to the second member, which portion may be held by an operator.

In the second embodiment shown in fig. 2, the second member 2 also covers the first member 1 at the same time in the shank portion, i.e. the second member 2 covers the entire first member 1. The tool bit part 3 is composed of an upper part of the first member 1 and a second member 2 covering the outside thereof. The shank portion 4 is composed of a lower portion of the first member 1 and the second member 2 covering the outside thereof.

First embodiment

As described above, in the first embodiment, the second member 2 covers the first member 1 at the blade end portion 3 of the blade. Because the second member 2 with lower hardness is coated outside the first member 1 with higher hardness, the whole scraper is not integrally formed by a material, and the second member 2 with lower hardness is in contact with the screen printing plate, the screen mesh of the screen printing plate and the slurry on the screen printing plate, the second member 2 with lower hardness is selected, so that the screen printing plate is prevented from being punctured, the damage to the screen printing plate is reduced, the manufacturing cost is reduced, and meanwhile, the scraper can be supported by the first member 1 with higher hardness to realize the strength required by the scraper so as to discharge and collect the slurry.

As one example, the second member is made of silicone. Preferably, the first component 1 is made of plastic (for example, PE polyethylene/PP polypropylene material). Because the hardness of the outer silicone member is relatively small (for example, shore 20 degrees), which is much smaller than the hardness (for example, 65 degrees) of the plastic first member 1, and the silicone has the forced rebound performance, the damage to the screen printing plate can be avoided. And the silica gel can be manufactured to have a thinner thickness, thereby facilitating the collection of the slurry by the scraper knife correspondingly. The above-described blade also has a number of advantages. For example: the first member 1 and the external silica gel member can be integrally molded by injection, the formed silica gel is coated on the first member 1, the process is simple, the processing cost is low, and the external silica gel member has no rough structures such as burrs and the like and has smooth surface; the scraper knife is high temperature resistant, easy to clean, long in service life, environment-friendly and non-toxic, the supporting strength of the internal plastic component is high, the insulativity is good, the cold resistance is good, the scraper knife still has good elasticity at the temperature of minus 60 ℃ to minus 70 ℃, and silica gel is used as an active adsorption material, has high adsorption performance, is insoluble in water and any solvent, and has stable chemical properties. Of course, it will be understood by those skilled in the art that the first member may be made of other materials, such as metal, alloy, etc., as long as the hardness of the first member is greater than that of the second member, so as to provide the supporting function and achieve the required strength of the blade. The second member may also be made of other materials that are less rigid and less prone to screen damage, such as TPE (thermoplastic elastomer) materials.

In the scraper knife of the embodiment, the sharp angle a is formed at one end of the knife head part 3 away from the knife handle part 4, so that the sharp angle part of the scraper knife at the sharp angle a can be used for cleaning slurry in the corners of the screen printing plate, and the condition that the screen printing plate is damaged by dry slurry due to the fact that the slurry in the corners is not cleaned completely is avoided. The scraper knife with the structure has the advantages especially in the case of automatic printing because the automatic printing speed is high, and slurry is easy to splash into the corners of the screen printing plate. Moreover, the scraper knife with the structure can also be used for cleaning slurry in a crack of the scraper tool, so that good cleaning and slurry collecting effects are achieved.

As an example of forming an acute angle on the blade portion of the blade, as shown in fig. 1, the blade portion of the blade includes first and second

straight sides

21 and 22 extending in the longitudinal direction of the blade, and a first arc-shaped side 23 intersecting the first and second

straight sides

21 and 22, respectively, wherein the first arc-shaped side 23 forms the acute angle with the first straight side 21. When in use, the scraper knife can be obliquely used, namely, the longitudinal direction of the scraper knife forms a certain angle with the forward pulp collecting direction, and the pulp is collected by enabling the direction of the first arc-shaped edge 23 to be transverse to the forward pulp collecting direction. The first arcuate edge 23 is shaped to facilitate the slurry collection operation.

Preferably wherein the width of the portion 12 of the first member 1 in the shank portion is greater than the width of the portion 11 thereof in the head portion. Preferably, the width of the first member 1 gradually increases from its one end in the tool head portion to its other end in the tool shank portion. The width of the first member is increased and the strength thereof is also increased, and the support performance obtained and the strength of the shank portion are also higher. It will be appreciated that the width of the first member 1 may not be progressively increased, as long as the width of the portion 12 in the shank portion is greater than the width of the portion 11 in the head portion.

Second embodiment

Second embodiment as an alternative to the first embodiment, the main difference with the blade according to the first embodiment is that the second member 2 also covers the first member 1 in said shank portion 4, and correspondingly the structure of the second member 2 in the shank portion, as will be described below. The description of the structure of the head portion, the structure of the first member 1, and their respective characteristics and advantages described in the first embodiment also applies to the second embodiment.

In the second embodiment, since the second member 2 covers the entire first member 1, possible damage to the screen due to the high stiffness of the first member 1 is further avoided, and the outer second member 2 at the shank portion is also able to contact the screen and the screen to collect slurry due to its lower stiffness, so that the shank portion also has a slurry collection function.

Illustratively, as shown in fig. 2, the shank portion includes, at an end thereof remote from the head portion (a lower end in fig. 2), a third straight edge 24 (may also be referred to as a flat edge) extending in a lateral direction of the blade, which is perpendicular to a longitudinal direction of the blade, and a second arc-shaped edge 25 intersecting the third straight edge on left and right sides thereof. The scraper knife with the structure has the advantages that the handle part can also be used for efficiently collecting the pulp, the third straight edge 24 is used for contacting with the screen printing plate to collect the pulp, and the two second arc-shaped edges 25 on the left side and the right side can be used for collecting the left pulp on the left side and the right side. The scraper knife can not only forward collect the slurry, but also backward collect the slurry, is more convenient for flexible operation of an operator, and can improve the slurry collection efficiency.

As shown in fig. 2, the length of the first member 1 in the shank portion in the longitudinal direction of the blade is greater than half the longitudinal length of the shank portion (i.e. the longitudinal length of the second member 2 in the shank portion), preferably the extension of the first member 1 in the shank portion within the second member 2 may be up to three quarters or more of the longitudinal length of the shank portion. The extension of the harder first member 1 in the shank portion gives the shank portion greater strength, so that the shank portion can be used for stirring the slurry. For example, when the viscosity of the slurry is high, the stirring can be performed with the blade.

Illustratively, as shown in fig. 2, the head portion further includes two third curved sides 26 extending from ends of the first and second

straight sides

21 and 22, respectively, remote from the first curved side 23. The third arcuate edge 26 extends from the lower ends of the first and second

straight edges

12, 22 toward the junction of the head portion and the shank portion. The scraper knife adopting the structure has smooth appearance and less sharp corners, and is not easy to cause damage to the screen printing plate.

The width of the shank portion 4 may also, for example, taper from its connection with the head portion 3 to the free end of the shank portion 4 until it reaches the above-mentioned second curved edge 25 on both sides. The scraper knife adopting the structure has smooth appearance and less sharp angle, and is not easy to cause damage to the screen printing plate.

Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto. Various changes and modifications within the spirit and scope of the utility model may be made by those skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model should be determined from the appended claims.

Claims

1. A paste scraper for screen printing, characterized in that the scraper comprises a first member (1) and a second member (2) having a hardness less than that of the first member (1), the first member (1) being coated with the second member (2) at least at a blade portion (3) of the scraper, wherein the blade portion is formed with an acute angle (A) at its end remote from a shank portion (4) of the scraper.

2. Pulp blade according to claim 1, characterized in that the blade part comprises a first (21) and a second (22) straight side extending in the longitudinal direction of the blade, and a first arc-shaped side (23) intersecting the first (21) and second (22) straight side, respectively, wherein the first arc-shaped side (23) forms the acute angle with the first straight side (21).

3. A pulp shovel blade according to claim 1 or 2, characterized in that the second member (2) also covers the first member (1) at the shank portion.

4. A pulp shovel blade according to claim 3, characterized in that the length of the first member (1) in the shank portion in the longitudinal direction of the shovel blade is greater than half the length of the shank portion.

5. The pulp shovel blade according to claim 3, wherein the handle portion includes at its end remote from the head portion: a third straight edge (24) extending in a direction perpendicular to the longitudinal direction of the blade, and two second arc-shaped edges (25) intersecting the third straight edge (24) on both sides thereof, respectively.

6. The pulp shovel blade according to any of claims 1, 2, 4-5, wherein the width of the portion of the first member (1) in the handle portion is greater than the width of the portion of the first member (1) in the head portion.

7. A pulp shovel blade according to claim 6, characterised in that the width of the first member (1) increases gradually from its end in the blade portion to its other end in the handle portion.

8. A pulp scraper blade according to any of claims 1-2, 4-5, 7, characterized in that the second member (2) is made of silicone and the first member (1) is made of plastic.

9. Pulp shovel blade according to claim 2, characterized in that the head part further comprises two third arc-shaped sides (26) extending from the ends of the first and second straight sides (21, 22) remote from the first arc-shaped side (23) to the connection of the head part and the shank part, respectively.

10. The slurry shovel blade according to claim 3, wherein the width of the shank portion decreases from its connection with the head portion to the free end of the shank portion.