CN216993520U

CN216993520U - Slurry scraper for silk-screen printing

Info

Publication number: CN216993520U
Application number: CN202220321443.0U
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: 2022-07-19
Anticipated expiration: 2032-02-17

Abstract

The utility model relates to a paste scraper for screen printing, comprising a first component (1) and a second component (2) with a hardness smaller than that of the first component (1), wherein the first component (1) is coated by the second component (2) at least at a blade part (3) of the scraper, and the blade part (3) comprises at one end thereof far away from a handle part (4) of the scraper: a first straight edge (21) extending in a direction perpendicular to a longitudinal direction of the blade, and two first arc-shaped edges (22) intersecting the first straight edge (21) on both sides thereof, respectively. The scraper knife of the utility model can adopt a second component which is made of silica gel and has smaller hardness, thereby reducing the damage to the screen printing plate. The scraper knife enables slurry to be collected in multiple directions, and slurry collection efficiency can be improved.

Description

Slurry scraper for silk-screen printing

Technical Field

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

Background

In laboratories and production lines, for example 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 scraper knives used in the current screen printing are plastic scraper knives which are processed through processes such as injection molding and blow molding, and the structure of the cutter head part and the structure of 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, how to enable an operator to conveniently and flexibly use the blade, such as collecting slurry in multiple directions, and how to improve slurry collecting efficiency is also a problem faced in the art when designing the blade.

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 the scraper head part comprises a first straight edge extending in a direction perpendicular to the longitudinal direction of the scraper and two first arc-shaped edges which are respectively intersected with the first straight edge at two sides of the first straight edge at one end of the scraper head part far away from the scraper.

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

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

Illustratively, the shank portion includes, at an end thereof remote from the head portion, a second straight edge extending in a direction perpendicular to a longitudinal direction of the blade, and two second arc-shaped edges intersecting the second straight edge 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.

Illustratively, the first member is made of plastic.

Illustratively, the width of the shank portion increases from its interface with the head portion to the ends of the two second arcuate edges distal from the second straight edge.

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; when the device is used, the straight edge in the transverse direction of the cutter head part is used for contacting with a screen printing plate to collect slurry, and the two arc-shaped edges on the left side and the right side can be used for collecting the residual slurry on the left side and the right side, so that the device is more convenient for flexible operation of an operator and can improve the slurry collecting efficiency; 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; 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 schematic front 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 for clarifying the present invention, and 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, it is contemplated that the utility model may be practiced with any combination of the following features and elements, whether or not they relate to different embodiments. 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 handle portion 4 is a lower portion of the first member 1 exposed to the second member, and can 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 member 1 is made of plastic (for example, PE polyethylene/PP polypropylene material). Because the hardness of the outer silicone rubber component is small (for example, the Shore hardness is 15 degrees), the hardness is much smaller than that of the plastic first component 1 (for example, 55 degrees), and the silicone rubber 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 blade of this embodiment, the blade head portion 3 of the blade includes, at its end remote from the shank portion 4, a first straight edge 21 extending in a direction perpendicular to the longitudinal direction of the blade and two first arc-shaped edges 22 intersecting the first straight edge 21 on both sides thereof, respectively. In use, the first straight edge 21 is used for being in contact with the screen printing plate to collect the slurry in the advancing direction, the two first arc-shaped edges 22 on the left side and the right side can be used for collecting the left slurry on the left side and the right side, the slurry collection in multiple directions can be realized, the flexible operation of operators is facilitated, and the slurry collection efficiency can be improved.

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 increases gradually 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 increasing, for example a stepped width may be used, the width of the portion 12 in the shank portion being 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 bit portion, the structure of the first member 1, and their respective characteristics and advantages described in the first embodiment also apply 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 second straight edge 24 extending in a direction perpendicular to the longitudinal direction of the blade, and two second arc-shaped edges 25 intersecting the second straight edge 24 on both sides thereof, respectively. The scraper knife with the structure has the advantages that the handle part can also be used for efficiently collecting slurry, the second straight edge 24 is used for contacting with the screen printing plate to collect the slurry, and the two second arc-shaped edges 25 on the left side and the right side can be used for collecting the residual slurry on the left side and the right side. Adopt the spiller of this exemplary structure, can receive thick liquid forward also can receive thick liquid backward, make things convenient for operator's nimble operation more, can improve and receive thick liquid 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, in the case where the viscosity of the slurry is high, the stirring can be performed conveniently using the blade.

Illustratively, as shown in fig. 2, the width of the shank portion 4 gradually increases from its interface with the head portion 3 to the ends of the two second arcuate edges 25 remote from the second straight edge 24. The scraper knife adopting the structure is more convenient for an operator to grasp the knife handle part, and is convenient for the operation.

Preferably, as shown in fig. 2, two first arcuate edges 22 extend from the first straight edge 21 to the intersection of the head and handle portions 4. The cutter head part in the shape can realize flexible slurry collection in multiple directions, and can increase the slurry bearing amount of the cutter head part, so that the slurry collection efficiency is improved.

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 present invention may be made by those skilled in the art without departing from the spirit and scope of the present invention, and therefore the scope of the present invention should be determined by that defined in 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 the first member (1), the first member (1) being coated with the second member (2) at least at a head portion (3) of the scraper, wherein the head portion (3) comprises at its end remote from a shank portion (4) of the scraper: a first straight edge (21) extending in a direction perpendicular to a longitudinal direction of the blade, and two first arc-shaped edges (22) intersecting the first straight edge (21) on both sides thereof, respectively.

2. A pulp shovel blade according to claim 1, characterised in that said second member (2) also covers said first member (1) in said shank portion (4).

3. Pulp shovel blade according to claim 2, characterized in that the length of the first member (1) in the shank part (4) in the longitudinal direction of the blade is greater than half the length of the shank part (4).

4. A pulp scraper according to claim 2 or 3, characterized in that the shank portion (4) comprises, at its end remote from the head portion (3), a second straight edge (24) extending in a direction perpendicular to the longitudinal direction of the scraper and two second arc-shaped edges (25) intersecting the second straight edge (24) on both sides thereof, respectively.

5. Slurry blade according to any one of claims 1-3, characterized in that the width of the portion of the first member (1) in the shank portion is larger than the width of the portion of the first member (1) in the head portion.

6. Slurry shovel blade according to claim 5, characterized in that the width of the first member (1) increases gradually from its end in the blade portion to its other end in the shank portion.

7. A pulp shovel blade according to any of claims 2-3 and 6, characterised in that said two first arc-shaped sides (22) extend from said first straight side (21) to the junction of said blade portion and said shank portion, respectively.

8. A pulp scraper blade according to any of claims 1-3, 6, characterized in that the second member (2) is made of silicone.

9. Pulp blade according to claim 8, characterized in that the first member (1) is made of plastic.

10. A pulp shovel blade according to claim 4, characterised in that the width of the shank portion increases gradually from its intersection with the blade portion to the end of the two second curved edges (25) remote from the second straight edge (24).