CN217892200U - Screen printing squeegee and printing unit - Google Patents

Abstract

The application provides a screen printing is with scraping strip and printing element relates to the printing work piece field. Scrape the strip including scraping the strip body, scrape the strip body have be used for with the half tone contact scribble scrape the plane, scrape the strip body and set up at least one and run through the through-hole of scraping the strip body, the through-hole is used for making thick liquids pass through the strip body of scraping at the printing in-process, the aforesaid is scraped the strip and can be improved the thick liquids waste and the poor technical problem of printing quality that printing in-process thick liquids overflow and lead to.

Description

Screen printing squeegee and printing unit

Technical Field

The application relates to the field of printing workpieces, in particular to a scraping strip for screen printing and a printing assembly.

Background

At present, in the screen printing process of the photovoltaic cell, a scraper bar is used to extrude the slurry out of a screen printing plate through a certain pressure so as to form a pattern on a silicon wafer. During the moving process of the scraper bar, a small amount of slurry penetrates through the screen printing plate, and most of the slurry is accumulated right in front of the scraper bar or overflows from two ends of the scraper bar. In the prior art, the accumulated and overflowed slurry is paved on the screen again through the return scraper, but the slurry still overflows and cannot reach the expectation, and the overflowed slurry cannot be leveled by the return scraper, so that particles are formed by drying, the slurry is wasted, the printing lines are thick, and the printing quality is poor.

Therefore, how to solve the problems of slurry waste and poor printing quality caused by slurry overflow in the printing process becomes a technical problem to be urgently solved by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a scraping strip and a printing assembly for screen printing, which can solve the technical problems of slurry waste and poor printing quality caused by slurry overflow in the printing process.

In a first aspect, an embodiment of the present application provides a scraper for screen printing, which includes a scraper body, the scraper body has a scraping plane for contacting with a screen, the scraper body is provided with at least one through hole penetrating through the scraper body, and the through hole is used for allowing a slurry to pass through the scraper body during a printing process.

In the above-mentioned realization in-process, because the printing pressure can be applyed to the half tone to the strip body is scraped to the printing in-process, consequently along with the removal of scraping the strip, the dead ahead of the moving direction of scraping the strip will be inevitable to produce the windrow, utilize the setting of through-hole this moment, can make the windrow in the place ahead flow to the rear of scraping the strip through the through-hole at the removal in-process, thereby avoid thick liquids to pile up the removal of scraping the strip in the place ahead influence of scraping the strip moving direction, effectively avoid the place ahead windrow to overflow from the both ends of scraping the strip, improve the extravagant technical problem of thick liquids that the printing in-process thick liquids lead to, and above-mentioned after setting up, the thick liquids through scraping the strip body can directly adopt the material return scraper to level in the printing process, avoid producing the poor problem of printing quality that the thick lines lead to.

In a possible embodiment, the number of the through holes is plural, and the plural through holes are arranged at intervals in the wiper strip body.

In the above-mentioned realization in-process, the setting of a plurality of through-holes not only can improve the efficiency that thick liquids pass through the bar body of scraping, and because a plurality of through-hole interval arrangements, consequently there is the bar body of scraping as supporting between two adjacent through-holes, can improve the supporting effect of bar body under the effect of printing pressure, avoids scribbling to scrape the in-process and scribbles to scrape the plane deformation and lead to the printing quality poor.

In one possible embodiment, the plurality of through holes are arranged equidistantly.

In the implementation process, the mode that the through holes are arranged along the length direction of the scraping strip body at equal intervals can further avoid the deformation of the scraping plane in the scraping process, so that the printing quality is improved.

In a possible embodiment, the minimum distance between any two adjacent through holes and the scraping plane is the same.

In the implementation process, the arrangement is convenient to process, the processing difficulty can be reduced, the thickness of the slurry passing through the scraping strip body in the printing process can be basically leveled by the arrangement, and the subsequent material return scraper is convenient to use for leveling.

In a possible embodiment, the minimum distance between the through-opening and the wiping plane is ≧ 2.5mm.

In the above-mentioned realization process, utilize the injecing of above-mentioned minimum distance, make printing in-process thick liquids can be through scraping the strip body, do not influence the hardness of scraping the strip body, avoid scribbling to scrape the in-process and scribble and scrape the plane and warp, if apart from the undersize, then can lead to being located the through-hole and scribbling the strip body of scraping between scraping the plane too little, make scribble and scrape the plane yielding under the effect of printing pressure, influence the printing quality.

In a possible embodiment, the cross-sectional size of the through-hole remains constant in its axial direction.

In the implementation process, the arrangement is convenient for processing.

In a possible embodiment, the material of the wiper strip body is polyurethane, fluorinated rubber, glass fiber or carbon fiber.

In the implementation process, the materials are convenient to obtain and can be selected according to actual requirements.

In a possible embodiment, the cross-sectional shape of the through-hole is rectangular, square, circular, oval, pentagonal or prismatic.

In the implementation process, the arrangement of the through holes can be selected according to actual requirements, and the selection surface is enlarged.

In a possible embodiment, the scraper bar further comprises a positioning plate for externally connecting the clamp, and the positioning plate is connected with one end of the scraper bar body, which deviates from the scraping plane.

In the above-mentioned realization process, utilize the setting of locating plate so that be connected bar body and anchor clamps, with its installation to bar arm etc. in order to carry out automated operation.

In a second aspect, embodiments of the present application provide a printing assembly, which includes a screen and the scraper bar provided in the above embodiments.

In the above-mentioned realization in-process, utilize the setting of through-hole, can make the windrow in the place ahead flow to the rear of scraping the strip through the through-hole at the removal in-process, thereby avoid thick liquids to pile up the removal of scraping the strip in the place ahead influence of scraping strip moving direction, effectively avoid the place ahead windrow to overflow out from the both ends of scraping the strip, improve the extravagant technical problem of thick liquids that the printing in-process thick liquids that overflow leads to, and after the above-mentioned setting, the thick liquids through scraping the strip body can directly adopt the feed back scraper to float the paper in the printing process, avoid producing the problem that the printing quality is poor that the lines leads to roughly.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a schematic structural view of a wiper strip according to some embodiments of the present disclosure;

fig. 2 is a schematic structural view of a wiper strip provided in embodiment 1;

fig. 3 is a schematic structural view of a wiper strip provided in example 2;

FIG. 4 is a schematic structural view of a wiper strip provided in some embodiments of the present application;

fig. 5 is a schematic structural diagram of a wiper strip according to some embodiments of the present disclosure.

An icon: 10-scraping strip; 100-bar body; 101-coating and scraping plane; 103-a through hole; 110-a positioning plate; 111-location holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The following specifically describes the doctor blade and the printing unit for screen printing according to the embodiment of the present application:

the application provides a printing assembly, which comprises a screen printing plate and a scraper bar for screen printing (hereinafter referred to as the scraper bar) and is suitable for forming patterns on the surface of a silicon wafer for preparing a photovoltaic cell.

The screen printing plate is also called a silk screen, and the screen printing plate is provided with hollow-out patterns, including but not limited to fine grid patterns, main grid patterns, back electrode patterns or back electric field patterns, so that the fine grid, the main grid, the back electrode or the back electric field patterns can be printed by using the printing assembly according to actual requirements, and the application range is expanded.

The surface of the screen is used for coating slurry, the slurry includes but is not limited to silver slurry, and aluminum slurry and the like.

The scraping strip is used for being matched with the screen printing plate, the scraping strip moves along the preset direction in the printing process, and printing pressure perpendicular to the screen printing plate is applied to the scraping strip in the moving process, so that the slurry is extruded out of the screen printing plate, and patterns corresponding to the hollow patterns are formed on the silicon chip.

Referring to fig. 1 to 5, the wiper strip 10 includes a wiper strip body 100, the wiper strip body 100 has a wiping plane 101 for contacting with a screen, the wiper strip body 100 is provided with at least one through hole 103 penetrating through the wiper strip body 100, and the through hole 103 is used for allowing slurry to pass through the wiper strip body 100 during a printing process.

In the above-mentioned realization in-process, because the printing pressure can be applyed to the half tone to bar body 100 is scraped to the printing process in the printing process, consequently along with the removal of scraping strip 10, the dead ahead of the moving direction of scraping strip 10 will be inevitable to produce the windrow, utilize the setting of through-hole 103 this moment, can make the windrow in the place ahead flow to the rear of scraping strip 10 through-hole 103 in the removal process, thereby avoid thick liquids to pile up the removal of scraping strip 10 in the place ahead influence of scraping strip 10 moving direction, effectively avoid the place ahead windrow to spill out from the both ends of scraping strip 10, improve the extravagant technical problem of thick liquids that the thick liquids spill over leads to in the printing process, and above-mentioned after setting up, the thick liquids through scraping strip body 100 can directly adopt the material return scraper to trowel in the printing process, avoid producing the poor problem of the thick printing that leads to of lines.

As shown in fig. 1, in some alternative embodiments, the number of through holes 103 is one.

As shown in fig. 2 to 5, the number of the through holes 103 is one or more, and here, a plurality is, for example, two, three, four or five, etc., and those skilled in the art can select the number according to actual requirements.

With reference to fig. 2 to 5, when there are a plurality of through holes 103, the through holes 103 are disposed at intervals on the wiper strip body 100.

Utilize the setting of a plurality of through-holes 103, not only improve thick liquids through the efficiency of scraping a body 100, moreover because a plurality of through-holes 103 interval arrangement, exist between two adjacent through-holes 103 and scrape a body 100 as the support, improve and scrape the supporting effect of a body 100 under the effect of printing pressure, avoid scribbling to scrape the in-process and scribble that it is poor to scrape plane 101 deformation and lead to the printing quality.

Alternatively, a plurality of through holes 103 are arranged at equal intervals in the wiper strip body 100. The setting of equidistant interval is utilized to make scribble scraping plane 101 can the even atress under the effect of printing pressure, improves printing quality.

Wherein, the bar of scraping the strip body 100 can be flat setting, the cuboid etc., in the in-service use, the thickness direction that makes the strip body 100 of scraping keeps parallel with the orientation of presetting of scraping the removal of strip 10, no matter the quantity of through-hole 103 is one or a plurality of this moment, each through-hole 103 all runs through the two surfaces of scraping the strip body 100 in thickness direction, thereby be favorable to when scraping the removal of strip body 100 along presetting the orientation, thick liquids in the place ahead of presetting the orientation remove to the rear of scraping the strip body 100 through scraping the strip body 100, avoid windrow and flash.

The axis of the through hole 103 may be parallel to the thickness direction, or may form an included angle of not more than 45 ° with the thickness direction.

In order to smoothly form the slurry on the surface of the screen plate through the bar body 100 during the movement, the axis of the through hole 103 is parallel to the thickness direction.

The cross-sectional shape of the through-hole 103 includes, but is not limited to, a circle, an ellipse, a polygon, and the like, and the cross-sectional shape herein refers to a cross-section of the through-hole 103 in a direction perpendicular to the thickness direction.

Alternatively, the cross-sectional shape of the through hole 103 is rectangular, square, circular, elliptical, pentagonal or prismatic, and those skilled in the art can select the shape of the through hole 103 according to actual needs.

When the number of the through holes 103 is plural, the cross-sectional shapes of the through holes 103 may be the same as that shown in fig. 2, 3 and 4, or may be different as shown in fig. 5, the sizes of the through holes 103 may be the same as that shown in fig. 2, 3 and 4, or may be different as shown in fig. 5, and those skilled in the art may select the through holes according to actual requirements.

The cross-sectional size of each through hole 103 may be constant along the axial direction thereof, or may vary along the axial direction thereof, for example, gradually increasing to a horn shape, etc., and is not limited herein, and for convenience of manufacturing, the cross-sectional size of each through hole 103 may be optionally constant along the axial direction thereof.

In order to enable the slurry to pass through the scraper bar body 100 in the printing process, not influence the hardness of the scraper bar 10, and avoid the problem that the scraper bar body 100 between the through holes 103 and the scraper plane 101 is too small due to too small distance, so that the scraper plane 101 is easy to deform under the action of printing pressure and the printing quality is influenced, no matter the number of the through holes 103 is one or more, the minimum distance between each through hole 103 and the scraper plane 101 is more than or equal to 2.5mm.

For example, the minimum distance between each through hole 103 and the squeegee plane 101 is 2.5 to 5mm.

When the number of the through holes 103 is plural, the minimum distance between each through hole 103 and the squeegee plane 101 may be the same or different.

Referring to fig. 4 and 5, in some alternative embodiments, the minimum distances between the at least two through holes 103 and the scraping plane 101 are different, that is, the at least two through holes 103 are staggered on the scraping bar body 100 on the side close to the scraping plane 101 and do not lie on the same plane (the plane is parallel to the scraping plane 101).

Referring to fig. 2 and fig. 3, in some alternative embodiments, the minimum distance between any two adjacent through holes 103 and the scraping plane 101 is the same, that is, the side of each through hole 103 close to the scraping plane 101 in the plurality of through holes 103 is located on the same plane (the plane is parallel to the scraping plane 101).

Alternatively, the material of the wiper strip body 100 may be polyurethane, fluorinated rubber, glass fiber or carbon fiber, and those skilled in the art can select the material according to actual requirements.

Referring to fig. 1 to 5, the wiper strip 10 further includes a positioning plate 110 for externally connecting to a fixture, and the positioning plate 110 is connected to an end of the wiper strip body 100 away from the wiping plane 101. The arrangement of the positioning plate 110 is utilized to facilitate the attachment of the bar body 100 to the jig, the mounting thereof to the bar 10 robot arm or the like for automated operation, wherein the positioning plate 110 may be provided with positioning holes 111 for positioning the jig.

The screen printing squeegee 10 of the present invention will be described in further detail with reference to examples below.

Example 1

Referring to fig. 2, a doctor blade 10 for screen printing is used to print a pattern on a battery sheet.

The scraper bar 10 comprises a scraper bar body 100 and a positioning plate 110, the scraper bar body 100 is provided with a coating and scraping plane 101 for contacting with a screen printing plate, the scraper bar body 100 deviates from the coating and scraping plane 101 and is connected with the positioning plate 110, and the positioning plate 110 is provided with a positioning hole 111. The wiper strip body 100 is provided with a through hole 103, and the through hole 103 is used for enabling slurry to pass through the wiper strip body 100 in the printing process.

In fig. 2, X represents the length, Y represents the width, the length, width and thickness of the wiper strip 10 are respectively a rectangular parallelepiped of 180mm, 50mm and 9mm, the length of the wiper strip body 100 is 180mm, the width is 15mm, the thickness is 9mm, and the wiper strip body 100 is made of polyurethane.

The through-hole 103 is the rectangular hole of length 20mm, wide 8mm, and wherein, the length direction of rectangular hole is parallel with the length direction of scraping strip 10, and the quantity of through-hole 103 is 5, and 5 through-holes 103 are arranged along the length direction equidistance interval of scraping strip 10, and the distance between the edge of two arbitrary adjacent through-holes 103 is 15mm.

The distance between the top edge (edge facing away from the scraping plane 101) of each through-hole 103 and the side of the bar body 100 facing away from the scraping plane 101 is 3.5mm, the distance between the bottom edge (edge near the scraping plane 101) of each through-hole 103 and the scraping plane 101 is 3.5mm, the bar body 100 has two side edges in its length direction, and the minimum distance between each side edge and the adjacent through-hole 103 is 10mm.

Example 2

Referring to fig. 3, a doctor blade 10 for screen printing is used to print a pattern on a battery sheet.

The scraper bar 10 comprises a scraper bar body 100 and a positioning plate 110, wherein the scraper bar body 100 is provided with a coating and scraping plane 101 for contacting with a screen printing plate, the scraper bar body 100 is connected with the positioning plate 110 away from the coating and scraping plane 101, and the positioning plate 110 is provided with a positioning hole 111. The scraper bar body 100 is provided with a through hole 103, and the through hole 103 is used for enabling the slurry to pass through the scraper bar body 100 in the printing process.

In FIG. 3, X represents the length, Y represents the width, and the bar 10 is a rectangular parallelepiped having a length, a width and a thickness of 180mm, 50mm and 9mm in this order. The scraper bar body 100 is a cuboid with the length of 180mm, the width of 15mm and the thickness of 9mm, and the scraper bar body 100 is made of polyurethane.

The through-hole 103 is diameter 8 mm's circular port, and the quantity of through-hole 103 is 10, and 10 through-holes 103 are arranged along the length direction equidistance interval of scraping strip 10, and the distance between the edge of two arbitrary adjacent through-holes 103 is 8mm.

The minimum distance between each through hole 103 and the wiper strip body 100 away from the wiping plane 101 is 3.5mm, the minimum distance between each through hole 103 and the wiping plane 101 is 3.5mm, the wiper strip body 100 has two side edges in the length direction thereof, and the minimum distance between each side edge and the adjacent through hole 103 is 14mm.

In summary, the scraping strip and the printing assembly for screen printing provided by the application can improve the technical problems of slurry waste and poor printing quality caused by slurry overflow in the printing process.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. The scraping strip for screen printing is characterized by comprising a scraping strip body, wherein the scraping strip body is provided with a coating and scraping plane which is used for being in contact with a screen printing plate, the scraping strip body is provided with at least one through hole which penetrates through the scraping strip body, and the through hole is used for enabling slurry to pass through the scraping strip body in the printing process.

2. The wiper strip according to claim 1, wherein the number of the through-holes is plural, and the plural through-holes are arranged at intervals in the wiper strip body.

3. The wiper strip according to claim 2 wherein a plurality of the through holes are arranged at equal intervals on the wiper strip body.

4. The wiper strip of claim 2 wherein the minimum distance between any adjacent two of the through holes and the wiping plane is the same.

5. The wiper strip according to any of claims 1-4, wherein the minimum distance between the through-hole and the wiping plane is ≥ 2.5mm.

6. The wiper strip according to any one of claims 1 to 4 wherein the cross-sectional size of the through-hole is constant in the axial direction thereof.

7. The wiper strip according to any of claims 1-4, wherein the wiper strip body is made of polyurethane, fluorinated rubber, glass fiber or carbon fiber.

8. The wiper strip of any of claims 1-4 wherein the cross-sectional shape of the through-holes is rectangular, square, circular, oval, pentagonal, or prismatic.

9. The wiper strip according to any of claims 1 to 4, further comprising a positioning plate for externally connecting a clamp, wherein the positioning plate is connected to an end of the wiper strip body facing away from the wiping plane.

10. A printing assembly comprising a screen and a wiper strip as defined in any one of claims 1 to 9.

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