A printing screen with adjustable tension

Abstract

The invention discloses a printing screen with adjustable tension, belonging to the technical field of screen printing. The screen comprises a screen frame and a screen, the screen frame is provided with a groove, a heating rod is buried in the groove, a thermocouple is provided on the surface of the screen frame, and the heating rod and the thermocouple are connected to a heating controller. The invention embeds a heating rod in the screen frame, utilizes the characteristic of a large thermal expansion coefficient of metal materials, and adopts a heating method to adjust the tension of the screen, has the advantages of simple structure, convenient operation, low cost, etc., can greatly improve the service life of the screen, and reduce the use cost.

Description

Technical Field

[0001] The invention relates to the technical field of screen printing, in particular to a tension-adjustable printing screen. Technical Background

[0002] Low temperature co-fired ceramic (LTCC) technology is a passive component integrated circuit technology developed in the 1980s. LTCC substrates support multi-layer wiring and can integrate some passive components into the substrate, making it have the advantages of high speed, high frequency, high density, and high reliability. It is conducive to system miniaturization, and improves system reliability while increasing circuit assembly density. Therefore, it is widely used in microwave communications, aerospace, and military electronics.

[0003] The conductor pattern in the LTCC substrate is realized by screen printing. The characteristics of LTCC multi-layer stacking and microwave transmission have very high requirements on the dimensional accuracy of the pattern lines and the inter-layer alignment accuracy. In the screen printing process, the screen tension is one of the important factors affecting the quality of the screen printing plate. The screen tension affects the ink permeability of the screen and the position accuracy of the line pattern. The screen itself is often made of elastic materials. It can undergo elastic deformation during printing and maintain a certain tension. However, after repeated use, the screen gradually undergoes irreversible deformation, which will cause the problem of tension drop, affecting the printing quality. Most of the existing screens cannot adjust the screen tension after production. Once the tension drops during use and affects the printing accuracy, they can only be scrapped and replaced with new ones. Summary of the invention

[0004] In view of this, the present invention proposes a printing screen with adjustable tension, which can adjust the tension of the screen and improve the printing accuracy and service life of the screen.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A tension-adjustable printing screen comprises a screen frame 1 and a composite structure screen, wherein the screen frame 1 is provided with a groove 10, a heating rod 4 is buried in the groove 10, the groove 10 is sealed with a heat-insulating tape 6, and a temperature-measuring thermocouple 11 is also provided on the surface of the screen frame 1; the composite structure screen comprises a polyester screen 2 arranged outside and a stainless steel screen 3 arranged in the center, the outer side of the stainless steel screen 3 is connected and fixed to the inner side of the polyester screen 2 by a screen adhesive, and the outer side of the polyester screen 2 is fixed to the screen frame 1 by a screen adhesive; the material of the screen frame 1 is a material with a thermal expansion coefficient greater than 1.2×10 -5 / ℃ metal.

[0007] Furthermore, a printed pattern 9 is provided on the stainless steel wire mesh 2 .

[0008] Furthermore, the material of the mesh frame 1 is aluminum.

[0009] Furthermore, there are four grooves 10 , which are respectively arranged on four inner side walls of the screen frame 1 .

[0010] Furthermore, the space between the groove 10 and the heating rod 4 is filled with thermal grease 5 .

[0011] A tension-adjustable printing screen, comprising a printing screen as described in any one of the above items, and also comprising a heating controller 8, wherein the heating rod 4 is connected to the temperature control interface of the heating controller 8 via a control line 7, and the temperature measuring thermocouple 11 is connected to the feedback interface of the heating controller 8 via the control line 7, and the temperature control range of the heating controller 8 is 25~50°C.

[0012] The beneficial effects of the above technical solution adopted by the present invention are:

[0013] 1. The present invention utilizes the physical property of the metal material having a large thermal expansion coefficient, adopts a heating method to enlarge the size of the screen frame, and performs secondary stretching on the polyester screen, thereby increasing the screen tension of the screen.

[0014] 2. With the present invention, when the screen becomes loose after being used many times, the screen frame size can be enlarged by heating to adjust the screen tension, so that the screen whose printing accuracy has deteriorated due to decreased tension can continue to be used, thereby extending the service life of the screen and reducing the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front cross-sectional view of the printing screen in the embodiment of the present invention.

[0016] Figure 2 4 is a top view of a cross-sectional view of a printing screen in an embodiment of the present invention.

[0017] In the figure: 1. screen frame; 2. polyester screen; 3. stainless steel screen; 4. heating rod; 5. thermal grease; 6. thermal insulation tape; 7. control line; 8. heating controller; 9. printed pattern; 10. groove; 11. thermocouple. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1 and 2 As shown, a tension-adjustable printing screen comprises a screen frame 1 and a composite structure screen, wherein the screen frame 1 is provided with grooves 10, wherein the grooves 10 are distributed on the frame of the screen frame 1, wherein heating rods 4 are embedded in the grooves 10, wherein the outside of the grooves 10 are fixed with a heat insulating tape 6, and wherein a thermocouple 11 is attached to the surface of the screen frame 1.

[0020] The composite structure screen includes a polyester screen 2 and a stainless steel screen 3, wherein the outer side of the stainless steel screen 3 is connected and fixed to the inner side of the polyester screen 2 by adhesive, the outer side of the polyester screen 2 is fixed to the screen frame 1 by adhesive, and the stainless steel screen 2 is provided with a printed pattern 9.

[0021] In order to achieve good expansion of the screen frame, the material of the screen frame 1 is preferably one with a thermal expansion coefficient greater than 1.2×10 -5 / ℃ metals, such as aluminum.

[0022] The screen does not need to be heated when it is initially used. When the screen is loose after multiple uses, the heating rod 4 and the thermocouple 11 can be connected to the heating controller 8 through the control line 7, and the temperature can be set on the heating controller 8. The heating controller 8 can maintain the temperature of the screen frame near the preset temperature through the heating rod, thereby achieving constant temperature control of the screen frame. At this time, the screen frame expands due to heat, the size of the screen frame becomes larger, and the polyester screen is stretched for a second time to adjust the screen tension, so that the screen whose printing accuracy has deteriorated due to the decrease in tension can continue to be used.

[0023] Further, see Figure 1 and 2 In the printing screen, a groove 10 is provided on each of the four inner walls of the screen frame 1, and a heating rod 4 is buried in the groove 10. The gap between the groove 10 and the heating rod 4 is filled with thermal grease 5 to ensure that the heat generated by the heating rod 4 can be quickly transferred to the screen frame 1. A temperature measuring thermocouple 11 is provided on the upper surface of the screen frame 1, and the heating controller 8 can achieve constant temperature heating of the screen frame through the feedback data of the thermocouple 11. The type of the screen screen is a composite structure composed of a polyester screen 2 and a stainless steel screen 3. The stainless steel screen 3 is provided with a printing pattern 9. By utilizing the physical property of the large thermal expansion coefficient of the metal material, the screen frame size is enlarged by heating, and the polyester screen 2 is stretched twice to increase the screen tension of the screen, so as to adjust the tension, so that the screen whose printing accuracy is deteriorated due to the decrease in tension can continue to be used, which prolongs the service life of the screen, saves costs, and has strong practicality.

[0024] The printing screen is realized by first selecting a suitable polyester screen 2 and a stainless steel screen 3 according to printing requirements, making a composite screen structure according to tension requirements, then burying a heating rod 4 in a groove 10, filling with thermal grease 5, pasting a thermal insulation tape 6, installing a thermocouple 11 on the surface of the screen frame 1, and connecting the heating rod 4, the thermocouple 11 and the heating controller 8 with a control line 7, so that the tension of the screen can be adjusted, so that the screen whose printing accuracy decreases due to tension decrease can continue to be used. Among them, the heating rod 4, the thermocouple 11 and the heating controller 8 are commercially available as a complete set.

[0025] In summary, the tension-adjustable printing screen of the present invention embeds a heating rod in the screen frame, utilizes the large thermal expansion coefficient of metal materials, and adopts heating to adjust the screen tension. It has the advantages of simple structure, convenient operation, low cost, etc., which can greatly improve the service life of the screen and reduce the cost of use.

[0026] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Some changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A tension-adjustable printing screen, characterized in that: It comprises a screen frame (1), a composite structure screen and a heating controller (8); The mesh frame (1) is provided with a groove (10), a heating rod (4) is embedded in the groove (10), the groove (10) is sealed with a heat insulating tape (6), and a temperature measuring thermocouple (11) is also provided on the surface of the mesh frame (1); the composite structure wire mesh comprises a polyester wire mesh (2) arranged on the outside and a stainless steel wire mesh (3) arranged on the center, the outer side of the stainless steel wire mesh (3) is connected and fixed to the inner side of the polyester wire mesh (2) by means of a mesh adhesive, and the outer side of the polyester wire mesh (2) is fixed to the mesh frame (1) by means of a mesh adhesive; the material of the mesh frame (1) is a material with a thermal expansion coefficient greater than 1.2×10 -5 / ℃ metal; The stainless steel wire mesh (3) is provided with a printed pattern (9); The material of the mesh frame (1) is aluminum; There are four grooves (10) in total, which are respectively arranged on four inner side walls of the screen frame (1); Thermal grease (5) is also filled between the groove (10) and the heating rod (4); The heating rod (4) is connected to the temperature control interface of the heating controller (8) via a control line (7), and the temperature measuring thermocouple (11) is connected to the feedback interface of the heating controller (8) via the control line (7). The temperature control range of the heating controller (8) is 25-50°C; The printing screen is realized by first selecting a polyester screen (2) and a stainless steel screen (3) according to printing requirements, manufacturing a composite screen structure according to tension requirements, then burying a heating rod (4) in a groove (10), filling with thermal grease (5), pasting a thermal insulation tape (6), arranging a temperature measuring thermocouple (11) on the surface of a screen frame (1), and connecting the heating rod (4), the temperature measuring thermocouple (11) and a heating controller (8) with a control line (7), so that the tension of the screen can be adjusted, and a screen whose printing accuracy is reduced due to reduced tension can continue to be used.

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