CN113619269B

CN113619269B - Method for spreading sizing agent on printing screen frame by using scraper

Info

Publication number: CN113619269B
Application number: CN202111039261.0A
Authority: CN
Inventors: 邱超文; 黄淑菲; 吕临风
Original assignee: Guangdong Esquel Textiles Co Ltd; Guilin Esquel Textiles Co Ltd
Current assignee: Guangdong Esquel Textiles Co Ltd; Guilin Esquel Textiles Co Ltd
Priority date: 2021-09-06
Filing date: 2021-09-06
Publication date: 2023-10-13
Anticipated expiration: 2041-09-06
Also published as: CN113619269A

Abstract

The application relates to a method for scraping and coating slurry on a printing screen frame by using a scraper, which comprises the following steps: the scraper is positioned at a first height, moves from the front end to the tail end of the printing screen frame, prints and pushes the surplus slurry to be accumulated to the tail end by utilizing a first cambered surface; the scraper passes over the surplus slurry to enable the second cambered surface to face the surplus slurry; the scraper descends and moves from the tail end to the front end of the printing screen frame, and the second cambered surface is utilized to spread the redundant sizing agent on the printing screen frame. The arc blade in this scheme makes the thick liquids in scraper the place ahead keep moving all the time, avoids the thick liquids static to cause the solidification, thereby makes the thick liquids reuse in combining the method that provides in this scheme, and then avoids the thick liquids extravagant.

Description

Method for spreading sizing agent on printing screen frame by using scraper

Technical Field

The application relates to the technical field of clothing production equipment, in particular to a printing scraper and a method for scraping and coating sizing agent on a printing screen frame by using the same.

Background

In a clothing factory, the patterns on the clothing can be printed through a printing process. The working principle of printing is that firstly, meshes with corresponding patterns are designed on a net above a net frame, then, sizing agents with corresponding colors are put on the net frame, sizing agents are scraped by a scraper, and are forced to the upper surfaces of cut pieces of clothes through the meshes, and printing and drying of the sizing agents are carried out for many times, so that the required printing effect is achieved, and corresponding patterns are printed on the clothes.

In this process, the conventional embossing doctor blade is in the form of a sheet and the doctor blade is much narrower than the screen frame of the embossing. In the scraping process, the scraper is easy to push slurry to two sides of the scraper, and the slurry between the scraper and the net frames at two sides is in a static state because the slurry is not participated in the scraping in the working process all the time, is easy to solidify, and is added continuously in the scraping process, so that more and more slurry are accumulated at two sides of the scraper, and the slurry cannot be reused after solidification, so that waste is caused.

Disclosure of Invention

Based on this, it is necessary to provide a printing doctor blade and a method for doctor-coating a printing screen frame with the doctor blade, which aims to solve the problem of printing paste waste in the prior art.

The application provides a printing doctor blade for doctor-coating a slurry on a printing screen, the doctor blade comprising:

a mounting handle;

the blade, the blade is circular-arc, blade fixed connection in the installation handle, the blade is crooked towards one side, the blade includes the first cambered surface towards crooked side and the second cambered surface opposite with first cambered surface.

The blade of arc profile is utilized to the scraper of above-mentioned scheme, when the scraper removes, utilize the arc structure of blade to hold the thick liquids, when the scraper moved forward promptly, the front thick liquids are accomodate to the arc position in centre by the scraper promotion, and pile up towards the both sides of blade, and the straight blade that adopts among the prior art, in the in-process of scraping thick liquids, the straight blade advances the thick liquids promotion in front of the scraper, but the holding capacity of straight blade is limited, when the thick liquids of straight blade place ahead pile up more and more, unnecessary thick liquids naturally flow to the place that thick liquids is less, just flow the both sides of straight blade for thick liquids constantly pile up in the both sides of straight blade, cause thick liquids dry solidification, the thick liquids in front of this scheme makes the thick liquids of scraper keep moving all the time, avoid the thick liquids stationary to cause solidification, thereby make thick liquids can reuse, and then avoid the thick liquids extravagant.

The technical scheme of the application is further described as follows:

in one embodiment, the mounting shank includes:

one end of the connecting plate is fixedly connected with the blade;

the mounting plate is parallel to the side surface of the other end of the connecting plate and is fixedly connected with the side surface of the other end of the connecting plate.

In one embodiment, a circular pipe is arranged on one side of the mounting plate connected with the connecting plate.

In one embodiment, the number of the round pipes is two, and the two round pipes are respectively arranged at two sides of the connecting plate.

The present application also provides a method of doctor blade coating a printing screen using a doctor blade comprising a doctor blade according to any of claims 1-4, the method comprising the steps of:

the scraper is positioned at a first height, moves from the front end to the tail end of the printing screen frame, prints and pushes the surplus slurry to be accumulated to the tail end by utilizing the first cambered surface;

the scraper passes over the surplus slurry to enable the second cambered surface to face the surplus slurry;

the scraper descends and moves from the tail end to the front end of the printing screen frame, and the second cambered surface is utilized to flatly spread the surplus slurry on the printing screen frame.

According to the method for scraping and coating the slurry on the printing screen frame by using the scraper, the scraper is firstly moved from the front end to the tail end of the printing screen frame to finish printing once, the excessive slurry is piled up by utilizing the concave structure of the first cambered surface, the piled excessive slurry is paved on the printing screen frame during the first printing by utilizing the reverse movement of the second cambered surface of the scraper, and the position of the scraper can be adjusted again at the moment to repeat the printing step, so that the method is circulated, and the excessive slurry is repeatedly utilized, so that the waste of the slurry is avoided, and the purpose of saving the slurry is realized.

The technical scheme of the application is further described as follows:

in one embodiment, the tail end comprises a first tail end position and a second tail end position, and the first tail end position and the second tail end position are both positioned inside the printing screen frame; the scraper is located first height, the scraper removes to the tail end from the front end of stamp screen frame, stamp and utilize first cambered surface promotes unnecessary thick liquids and piles up to the tail end, includes: the excess slurry is deposited between the first tail end position and a second tail end position.

In one embodiment, the doctor blade passing over the excess slurry, the second cambered surface facing the excess slurry comprises:

the scraper ascends to a second height which is larger than the highest height of the redundant slurry;

the scraper advances to pass over the surplus slurry so that the second cambered surface faces the surplus slurry.

In one embodiment, the scraper descends and moves from the tail end to the front end of the printing screen frame, and tiling the surplus slurry on the printing screen frame by using the second cambered surface comprises:

the scraper descends to a third height which is smaller than the highest height of the redundant slurry;

the scraper moves from the tail end to the front end of the printing screen frame, and the second cambered surface is utilized to flatly spread the redundant slurry on the printing screen frame;

the doctor blade is reset to the first height.

In one embodiment, the third height is greater than the first height.

In one embodiment, the width of the scraper is adapted to the width of the printing screen frame, so that the surplus slurry does not flow into the gaps between the two sides of the scraper and the printing screen frame when the scraper moves.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a block diagram of a doctor blade according to an embodiment of the application;

FIG. 2 is a flow chart of a method of doctor blade coating a printing screen using a doctor blade according to an embodiment of the application;

fig. 3 is a schematic view illustrating an operation state of a doctor blade according to an embodiment of the present application.

Reference numerals illustrate:

110. a scraper; 111. a blade; 1111. a first cambered surface; 1112. a second cambered surface; 112. a mounting handle; 1121. a mounting plate; 1122. a connecting plate; 1123. a circular tube; 1124. a transition section; 120. printing a screen frame; 121. a front end; 122. tail end; 123. a tail end frame; 124. a gauze; 130. surplus slurry; 140. a first height; 150. a second height; 160. a third height; 170. a first tail end position; 180. and a second tail end position.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

The preferred embodiments of the present application will be described below with reference to the accompanying drawings.

Referring to fig. 1, a doctor blade 110 is shown for doctor blade coating a slurry on a printing frame 120 according to an embodiment of the application. Doctor blade 110 includes a blade 111 and a mounting handle 112. One end of the blade 111 is fixedly connected to the mounting handle 112, the blade 111 is bent toward one side, and the blade 111 includes a first cambered surface 1111 toward the bent side and a second cambered surface 1112 opposite to the first cambered surface 1111.

As shown in fig. 1, the blade 111 is bent toward the left side, so that the first cambered surface 1111 is in a concave structure, and when the doctor blade 110 is in use, as the blade 111 moves forward, the surplus slurry 130 is gradually accumulated and stored into the concave structure of the blade 111 under the forward thrust of the first cambered surface 1111. Here, forward movement means that the blade 111 is continuously advanced in the moving direction thereof when doctor blade is applied.

Referring to fig. 3, when printing on the printing screen unit 120, a doctor blade scrapes the paste, a part of the paste permeates into clothes, and a part of the paste remaining in the printing screen unit 120 is an excess paste 130.

The doctor blade 110 of the above-described embodiment uses the first cambered surface 1111 of the concave structure of the blade 111, and uses the first cambered surface 1111 of the blade 111 to contain the slurry. Specifically, when the scraper 110 moves forward, the surplus slurry 130 is pushed by the scraper 110 to be received in the arc-shaped portion of the first arc 1111 without being accumulated to both sides of the blade 111. In the process of scraping the slurry, the slurry in front of the scraper 110 is pushed by the straight blade, but the storage capacity of the straight blade is limited, when the slurry accumulated in front of the straight blade is more and more, the redundant slurry 130 naturally flows to the place where the slurry is less, and flows to the two sides of the straight blade, so that the slurry is continuously accumulated on the two sides of the straight blade, the slurry on the two sides of the straight blade is not pushed by the straight blade to be in a static state, and the slurry on the two sides is gradually dried and solidified. The curved blade 111 in this scheme can make more thick liquids be accomodate to scraper 110 the place ahead and remain motion all the time under the promotion of scraper 110, accomodates unnecessary thick liquids 130 in scraper 110's place ahead as far as possible, makes unnecessary thick liquids 110 can keep moving under scraper 110's promotion to avoid the thick liquids flow direction both sides to keep standing the back and solidify, thereby make thick liquids can reuse, and then avoid the thick liquids extravagant.

The technical scheme of the application is further described as follows:

referring to FIG. 1, in one embodiment, the mounting handle 112 includes a mounting plate 1121 and a web 1122. Wherein the mounting plate 1121 and the blade 111 are respectively connected to both ends of the connection plate 1122.

Generally, for safety of the scraper 110 in use, the mounting plate 1121 and the blade 111 are fixedly connected to the connecting plate 1122 to prevent accidents caused by the scraper 110 falling off in use. Specifically, the attachment plate 1121 and the blade 111 may be fixed to the connection plate 1122 by means of adhesion, integral molding, screw connection, or the like. In this embodiment, the mounting plate 1121 and the blade 111 are welded to the connection plate 1122.

As shown in fig. 1, a mounting plate 1121 is connected to one end of the connection plate 1122 and parallel to the side of the one end of the connection plate 1122, and both the connection plate 1122 and the mounting plate 1121 combine to form a T-shaped structure, wherein the mounting plate 1121 serves as a cross member of the T-shaped structure and the connection plate 1122 serves as a vertical leg of the T-shaped structure. For example, the blade 111 is advanced in a direction parallel to the horizontal plane, the connection plate 1122 is perpendicular to the horizontal plane, and the mounting plate 1121 is parallel to the horizontal plane. The end of the blade 111 remote from the mounting plate is used to blade the slurry.

Since the blade 111 is circular arc-shaped, the connection plate 1122 may be provided in a straight line shape according to the actual mounting requirement. When the connection plate 1122 is linear, a transition section 1124 parallel to the mounting plate 1121 may be provided at the connection between the connection plate 1122 and the blade 111, where the transition section 1124 is used to increase the connection area between the connection plate 1122 and the blade 111, so that the connection between the connection plate 1122 and the blade 111 is more firm.

In one embodiment, the side of the mounting plate 1121 that is connected to the web 1122 is provided with a circular tube 1123.

Typically, the doctor blade 110 needs to be installed for use in a printing machine. A circular tube 1123 is provided at the bottom end of the mounting plate 1121 for cooperating with a mounting member of the printer to serve as a guide when the scraper 110 is mounted to the printer.

In the present embodiment, the circular tube 1123 is fixedly connected to the mounting plate 1121, and more specifically, the circular tube 1123 and the mounting plate 1121 are welded.

Preferably, the number of the circular tubes 1123 is two, and the two circular tubes 1123 are respectively disposed at both sides of the connection plate 1122.

Two circular pipes 1123 are respectively disposed on both sides of the connection plate 1122, and the arrangement direction of the two circular pipes is identical to the arrangement direction of the first cambered surface 1111 and the second cambered surface 1112. As shown in fig. 1, two circular pipes 1123 are provided at intervals in a direction parallel to the mounting plate 1121 and located on both sides of the connection plate 1122; while the thickness direction of the blade is also parallel or substantially parallel to the mounting plate 1121, the first cambered surface 1111 and the second cambered surface 1112 are aligned in a direction parallel to the mounting plate 1121. The advancing direction of the first arc surface 1111 and the second arc surface 1112 is a direction perpendicular to the first arc surface 1111 and the second arc surface 1112, and since the arrangement direction of the two circular pipes 1123 is identical to the arrangement direction of the first arc surface 1111 and the second arc surface 1112, the advancing direction is also perpendicular to the axial direction of the two circular pipes 1123. In this way, in the process of installing the scraper 110, the scraper 110 can be guided not only in the axial direction of the circular pipe 1123, but also in the forward or backward direction of the blade 111, and the blade 111 is prevented from shaking due to the resistance of the slurry during the forward or backward movement.

Referring to fig. 2 and 3, the present application also provides a method of doctor blade coating a printing screen using a doctor blade 110, the doctor blade 110 comprising the doctor blade 110 as described above, the method comprising the steps of:

s10: doctor blade 110 is at first height 140 and doctor blade 110 moves from leading end 121 to trailing end 122 of screen frame 120, prints, and pushes excess slurry 130 to pile up to trailing end 122 with first cambered surface 1111.

It should be noted that, the printing screen 120 is a rectangular frame with four edges surrounding a circle, and the bottom end of the frame is fixed with a gauze 124. Wherein the leading end 121 and the trailing end 122 of the printing screen 120 represent opposite ends of the printing screen 120, respectively. Printing means: the bottom of the scraper 110 is close to but does not scrape the bottom screen 124 of the printing screen frame 120, and when the scraper 110 moves forward, the slurry permeates through the small holes of the screen 124 of the printing screen frame 120 and flows onto the clothing to be printed due to the viscosity of the slurry pushed by the scraper 110.

Since the apertures in the screen 124 of the screen frame 120 are relatively small, the amount of slurry that permeates into the garment during printing is relatively small, and only a thin layer is applied to the garment. In general, in actual production, the printing frame 120 contains more slurry than is needed for printing, and thus, a portion of the slurry that cannot penetrate the clothes and remains in the printing frame 120 is generated during printing, and this portion of the slurry is referred to as excess slurry 130 in the present application.

That is, at the first height 140, the bottom of the doctor blade 110 is able to draw slurry into the pores of the permeable screen 124. In general, the first height 140 may be set to a position where the doctor blade 110 contacts the bottom end screen 124 of the printing frame 120, or may be set to a position where the bottom of the doctor blade 110 is proximate to but does not scrape the bottom end screen 124 of the printing frame 120.

In this embodiment, in order to protect the bottom screen 124 of the printing frame 120 and avoid the bottom screen 124 from being scratched by the doctor blade 110 due to improper operation, the first height 140 in this embodiment is a position where the bottom of the doctor blade 110 is close to but not scratched to the bottom screen 124 of the printing frame 120.

During printing, the printing screen 120 is generally horizontally disposed and the doctor blade 110 is also horizontally advanced, i.e., the doctor blade 110 is horizontally moved.

It should be noted that, the tail end 122 includes a first tail end position 170 and a second tail end position 180, the first tail end position 170 and the second tail end position 180 are both located inside the printing screen frame 120, and S10 includes: excess slurry 130 is deposited between a first tail end location 170 and a second tail end location 180.

It will be appreciated that the doctor blade 110 can only be brought into proximity with the trailing end 122 of the printing frame 120, but not in contact with or coincident with the trailing end frame 123, due to the presence of excess slurry 130 and the arcuate configuration of the doctor blade 110, and the horizontal position of the doctor blade 110 at this point can be marked as the first trailing end position 170.

It will be appreciated that, because the doctor blade 110 provided by the present application is adopted by the doctor blade 110, when the doctor blade 110 is located at the first end position 170 of the printing frame 120 and is located at the first height 140, the distance between the doctor blade 110 and the end frame 123 of the printing frame 120 should be not less than the thickness of the two blades 111 due to the concave structure of the surplus paste 130 and the first cambered surface 1111 of the blades 111, so that enough space is left for the doctor blade 110 to pass over the surplus paste 130 in the subsequent steps. It is understood that the thickness of the blade 111 refers to the maximum distance between the first and second cambered surfaces 1111, 1112 of the blade 111 in the advancing direction.

It will be appreciated that the location of the first tail end location 170 may be adjusted depending on how much excess slurry 130 or the thickness of the blade 111.

The doctor blade 110 is advanced to pass over the excess slurry 130 between the first end position 170 and the second end position 180, but the position of the doctor blade 110 after the advancement is still at the end 122 of the printing frame 120, except that the horizontal position of the doctor blade 110 after passing over the excess slurry 130 is marked as the second end position 180 closer to the end border 123 of the printing frame 120 than the first end position 170.

It will be appreciated that the distance that the blade 110 advances is not less than the thickness of the excess slurry 130 in the direction of advance, that is, the distance between the first tail end position 170 and the second tail end position 180 should not be less than the thickness of the excess slurry 130 in the direction of advance of the blade 110. The initial position of the doctor blade 110 is at the front end 121 of the screen frame 120, with a height at the first height 140, and the slurry is placed on the side of the advancing direction of the doctor blade 110, i.e. on the side of the doctor blade 111 remote from the front end 121 of the screen frame 120. In other words, the slurry is placed in front of the advancing direction of the doctor blade 110. During printing, the doctor blade 110 is moved horizontally from the front end 121 of the printing frame 120 to the first end position 170 of the printing frame 120 while maintaining the height of the first height 140.

Since the doctor blade 110 employs the doctor blade 110 provided by the present application. When the blade 111 moves forward, the front slurry is pushed and stored by the first cambered surface 1111 of the scraper 110 to the middle cambered position, and is not accumulated on two sides of the blade 111, and the surplus slurry 130 is accumulated into a slurry pile with one cambered side under the storage effect of the blade 111.

S20: the doctor blade 110 passes over the excess slurry 130. In this step, the doctor blade 110 is passed over the excess slurry 130, i.e., in the advancing direction of the doctor blade 110, the doctor blade 110 is passed over the excess slurry 130 and in front of the excess slurry 130. So that the excess slurry 130 is between the doctor blade 110 and the front end 121 of the screen frame 120, the second cambered surface 1112 of the blade 111 is facing the excess slurry.

In one embodiment, S20: the doctor blade 110 passes over excess slurry 130 including:

s21: the doctor blade 110 is raised to a second height 150, the second height 150 being greater than the highest height of the excess slurry 130;

after step S10, the doctor blade 110 is located at the first end position 170 of the printing screen frame 120 and at the first height 140, and the surplus slurry 130 is stacked at a height higher than the bottom of the doctor blade 110 under the action of the blade 111. The second height 150 in S21 refers to a position where the bottom of the scraper 110 is higher than the highest height of the surplus slurry 130.

In step S21, the doctor blade 110 is only raised in height, and does not advance or retreat. That is, after step S21, the final position of the doctor blade 110 is at the first end position 170 of the printing frame 120 and at the second height 150.

S22: the doctor blade 110 advances over the excess slurry 130.

It should be noted that in step S22, the doctor blade 110 is horizontally displaced under the condition of constant height, that is, after step S22, the doctor blade 110 is located at the second end position 180 of the printing frame 120 and is located at the second height 150, and the surplus slurry 130 is located below the doctor blade 110 and far away from the end frame 123 of the printing frame 120.

S30: the doctor blade 110 descends and moves from the trailing end 122 to the leading end 121 of the screen frame 120, spreading the excess slurry 130 on the screen frame 120 using the second curve 1112.

It will be appreciated that after step S22, the doctor blade 110 is located at the second end position 180 of the printing frame 120 and at the second height 150, and the second cambered surface 1112 of the doctor blade 110 is not in contact with the surplus slurry 130, so that the doctor blade 110 must be lowered to the height position where the second cambered surface 1112 can push the surplus slurry 130 before the doctor blade 110 moves in the horizontal direction. The doctor blade 110 then moves from the tail end 122 to the front end 121 of the printing frame 120 using the second curved surface 1112 to push the excess slurry 130 to be spread on the printing frame 120. It will be appreciated that the doctor blade 110 is moved from the second trailing end position 180 of the printing frame 120 to the leading end 121 by means of the second cambered surface 1112.

Because the second cambered surface 1112 is in a convex structure, in the process of moving from the tail end 122 to the front end 121 of the printing screen frame 120, the middle outer convex part of the second cambered surface 1112 is firstly contacted with the surplus slurry 130, and the surplus slurry 130 flows to two sides along the cambered surface of the second cambered surface 1112, so that the surplus slurry 130 is flatly paved in the printing screen frame 120.

In one embodiment, S30: the blade 110 descends and moves from the trailing end 122 to the leading end 121 of the printing screen unit 120 and spreads the excess slurry 130 over the printing screen unit 120 comprising:

s31: the doctor blade 110 is lowered to a third height 160, the third height 160 being less than the highest height of the excess slurry 130.

After S22, the doctor blade 110 is located at the second end position 180 of the printing frame 120 and at the second height 150, and in S31, the doctor blade 110 is lowered to the third height 160 with the horizontal position unchanged. The third height 160 refers to that the bottom height of the scraper 110 is lower than the highest height of the surplus slurry 130, so that the subsequent horizontal movement of the scraper 110 can change the state of the surplus slurry 130, and push the surplus slurry 130 to move.

That is, after step S31, the doctor blade 110 is located at the second end position 180 of the printing frame 120 and at the third height 160, and the excess slurry 130 is located on the side of the doctor blade 110 away from the end frame 123 of the printing frame 120.

In general, third height 160 may be higher than first height 140 or may be comparable to first height 140. However, since the bottom of the doctor blade 110 is close to but not scraping the bottom screen 124 of the printing frame 120 in the first height 140, the third height 160 should not be smaller than the first height 140 in order to prevent the doctor blade 110 from damaging the bottom screen 124.

In one embodiment, third height 160 is greater than first height 140.

Since the tail end 122 of the printing screen 120 has the surplus paste 130 accumulated, the height of the surplus paste 130 is higher than the paste laid during printing, and the third height 160 is generally set to be higher than the first height 140 in order to ensure printing quality and the service life of the doctor blade 110.

Wherein, the third height 160 should be such that the doctor blade 110 moves horizontally from the front end 121 to the rear end 122 of the printing frame 120 or from the rear end 122 to the front end 121 once in the state of the height, and the surplus paste 130 can be spread inside the printing frame 120.

In actual production, the specific height of the third height 160 is related to the amount of the surplus size 130 and the specification of the bottom screen 124 of the printing screen 120, and can be adjusted through multiple tests.

S32: the doctor blade 110 moves from the trailing end 122 to the leading end 121 of the printing frame 120, spreading the excess slurry 130 over the printing frame 120 using the second curve 1112.

In S32, the doctor blade 110 is maintained at a third height 160, horizontally moved from the second trailing end position 180 of the printing frame 120 to the leading end 121. After step S32, doctor blade 110 is positioned at third height 160 at front end 121 of screen frame 120.

Since there is a gap between the bottom of the doctor blade 110 and the bottom end screen 124 of the screen frame 120 when the doctor blade 110 is at the third height 160, the excess slurry 130 is spread into a layer of excess slurry 130 in the screen frame 120 during the horizontal movement of the doctor blade 110 from the second end position 180 of the screen frame 120 to the front end 121, wherein the thickness of the layer of excess slurry 130 corresponds to the height of the gap between the bottom of the doctor blade 110 and the bottom end screen 124 of the screen frame 120. That is, in actual production, the thickness of the excess slurry 130 layer can be changed by adjusting the height of the gap between the bottom of the doctor blade 110 and the bottom end screen 124 of the screen frame 120.

S33: the doctor blade 110 is reset to the first height 140.

In S33, the horizontal position of the doctor blade 110 is unchanged, and the height is reduced from the third height 160 to the first height 140, that is, after step S33, the doctor blade 110 is located at the first height 140 of the front end 121 of the printing frame 120, that is, the initial position of the doctor blade 110 in the method.

After passing through step S33, the next printing may be performed starting from S10. The process from S10 to S33 is to finish one-time printing and one-time spreading of the excess slurry 130, and the repeated printing and the repeated utilization of the slurry can be realized by continuously circulating S10 to S33, and the slurry is only needed to be added manually or automatically by equipment when the excess slurry is insufficient in the process.

In the method for scraping and coating the slurry on the printing screen frame by using the scraper in the above scheme, the scraper 110 is moved from the front end 121 to the tail end 122 of the printing screen frame 120 to finish one-time printing, then the scraper 110 is moved reversely to spread the surplus slurry 130 accumulated during the first printing on the printing screen frame 120, and at the moment, the position of the scraper 110 can be adjusted again to repeat the printing step, so that the surplus slurry 130 can be recycled, thereby avoiding the waste of the slurry and achieving the purpose of saving the slurry.

The technical scheme of the application is further described as follows:

in one embodiment, the width of the doctor blade 110 is adapted to the width of the printing frame 120 such that excess slurry 130 does not flow into the gap between the sides of the doctor blade 110 and the printing frame 120 as the doctor blade 110 moves. In practical production, in order to avoid waste of slurry outside the moving range of the doctor blade 110, the width of the doctor blade 110 may be as close to the width of the printing screen frame 120 as possible, but it should be ensured that the doctor blade 110 maintains a clearance fit with the printing screen frame 120, so that the doctor blade 110 will not be disturbed by the printing screen frame 120 during the moving process.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Claims

1. A method of doctor blade coating a printing screen with a doctor blade, the doctor blade comprising a blade which is arcuate, the blade being curved towards one side, the blade comprising a first arcuate surface towards the curved side and a second arcuate surface opposite the first arcuate surface, characterized in that the width of the doctor blade is adapted to the width of the printing screen such that excess slurry does not flow into the gap between the two sides of the doctor blade and the printing screen when the doctor blade is moved, the method comprising the steps of:

the scraper descends and moves from the tail end to the front end of the printing screen frame, the second cambered surface is utilized to flatly spread the surplus slurry on the printing screen frame,

wherein, the scraper descends and moves from the tail end to the front end of the printing screen frame, and the second cambered surface is utilized to flatly lay the redundant slurry on the printing screen frame, and the method comprises the following steps:

the horizontal position of the scraper is unchanged and reset to the first height.

2. The method of doctor blade coating a printing screen of claim 1, wherein the tail end comprises a first tail end position and a second tail end position, the first tail end position and the second tail end position being located inside the printing screen; the scraper is located first height, the scraper removes to the tail end from the front end of stamp screen frame, stamp and utilize first cambered surface promotes unnecessary thick liquids and piles up to the tail end, includes: the excess slurry is deposited between the first tail end position and a second tail end position.

3. The method of doctor blade coating a printing screen using a doctor blade as claimed in claim 1, wherein the doctor blade passes over the excess slurry, the second cambered surface facing the excess slurry comprising:

4. The method of doctor blade coating a printing screen as claimed in claim 1, wherein the third height is greater than the first height.

5. The method of doctor blade coating a printing screen using a doctor blade as claimed in claim 1, wherein the doctor blade further comprises a mounting handle, the blade being fixedly attached to the mounting handle.

6. The method of doctor blade coating a screen frame with a doctor blade as in claim 5, wherein the mounting shank includes a mounting plate and a web, and the blade is welded to the web.

7. The method of doctor blade coating a printing screen using a doctor blade as claimed in claim 5, wherein the mounting shank includes:

one end of the connecting plate is fixedly connected with the blade;

8. The method of doctor blade coating a printing screen using a doctor blade as claimed in claim 7, wherein the web and the mounting plate combine to form a T-shaped structure.

9. The method of doctor blade coating a printing screen as claimed in claim 7, wherein the side of the mounting plate to which the connection plate is attached is provided with a circular tube.

10. The method of doctor blade coating a printing screen of claim 9, wherein the number of circular tubes is two, two of the circular tubes being disposed on each side of the web.