CN117913518A - Efficient curved surface conformal line manufacturing method - Google Patents
Efficient curved surface conformal line manufacturing method Download PDFInfo
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- CN117913518A CN117913518A CN202410049762.4A CN202410049762A CN117913518A CN 117913518 A CN117913518 A CN 117913518A CN 202410049762 A CN202410049762 A CN 202410049762A CN 117913518 A CN117913518 A CN 117913518A
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- curved surface
- conformal line
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- conformal
- conductive material
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 40
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- 238000005507 spraying Methods 0.000 claims description 14
- 229920002635 polyurethane Polymers 0.000 claims description 8
- 239000004814 polyurethane Substances 0.000 claims description 8
- 238000010147 laser engraving Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 description 15
- 238000007639 printing Methods 0.000 description 12
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Abstract
The invention provides a method for manufacturing a high-efficiency curved surface conformal line, which comprises the following steps: s1, manufacturing a contour of a conformal line on a curved carrier, and dividing the curved carrier into a graph area and a non-graph area; s2, forming a shielding layer on the non-pattern area; s3, placing a conductive material on the pattern area to form a conformal line; s4, removing the shielding layer. The manufacturing method of the invention has high production efficiency and low cost, and is suitable for mass production.
Description
Technical Field
The invention relates to the technical field of conformal lines, in particular to a method for manufacturing an efficient curved surface conformal line.
Background
In the existing curved surface carrier function circuit manufacturing process, the LDS process flow is complex and not environment-friendly enough, but the existing ink-jet printing mode is difficult to form a function circuit such as an antenna structure on the curved surface carrier, in addition, in the multilayer printing process, how to print conductive paste of each layer on the same position, and ensure that the multilayer conductive paste can form a curved surface printed circuit such as a curved surface antenna with a preset pattern are problems which are difficult to solve by the existing common silk screen printing, pad printing and other methods. Based on the above, the inventor of the present invention found in the research process that by adopting a conductive paste with a specific viscosity, controlling the drop height of the conductive paste, and printing the conductive paste on a pattern area of a curved carrier in combination with an inkjet printing method and performing curing treatment, antennas or other functional circuits with various three-dimensional curved structures can be successfully manufactured, and preferably, while ensuring good communication functions of the antennas, scattering points or satellite drops can be avoided, blocking of a nozzle and generation of bubbles on the surface of the antennas are reduced, and flatness of the surfaces of the antennas is improved, so that the yield of the antennas is further improved.
However, the existing ink-jet printing method has extremely high requirements on the conductive paste, and the conductive paste needs to be 'free of blocking the spray head' and 'standing up', so that the cost of the conductive paste is high, and the method is not suitable for large-scale production. In addition, the existing inkjet printing method is affected by the nozzle, so that the width and thickness of the formed conductive line are difficult to meet the requirements.
Disclosure of Invention
The invention aims to solve the technical problems of providing the high-efficiency curved surface conformal line manufacturing method which has high production efficiency and low cost and is suitable for mass production.
In order to solve the above problems, the present invention provides a method for manufacturing a high-efficiency curved surface conformal line, comprising the following steps:
s1, manufacturing a contour of a conformal line on a curved carrier, and dividing the curved carrier into a graph area and a non-graph area;
S2, forming a shielding layer on the non-pattern area;
s3, placing a conductive material on the pattern area to form a conformal line;
S4, removing the shielding layer.
As an improvement of the above solution, the method for forming the contour of the conformal line on the curved carrier in step S1 includes:
forming a groove on the curved carrier by adopting a laser engraving method, wherein the groove divides the curved carrier into a graph area and a non-graph area;
The width of the groove is 0.3-0.4 mm, and the depth of the groove is less than or equal to 3mm.
As an improvement of the scheme, the width of the groove is 0.3-0.35 mm, and the depth is 0.5-1.5 mm.
As an improvement of the above solution, the method for forming a shielding layer on the non-pattern area in step S2 includes: and (3) placing the strippable glue on the non-pattern area in a spraying or smearing mode to form a shielding layer.
As an improvement of the scheme, the viscosity of the peelable glue is 500-1500 cp, and the peeling force is less than 5N.
As an improvement of the scheme, the strippable glue is aqueous polyurethane strippable glue;
And/or the viscosity of the peelable glue is 800-1200 cp, and the peeling force is 1-5N.
As an improvement of the scheme, the baking temperature of the aqueous polyurethane peelable glue is 60-80 ℃ and the baking time is 0.5-1 hour.
As an improvement of the above solution, the method for forming a conformal line by disposing a conductive material on the pattern area in step S3 includes:
s31, placing a conductive material in a pattern area by adopting a spraying or smearing mode;
S32, curing the conductive material to obtain the conformal line.
As an improvement of the scheme, the viscosity of the conductive material is 200-300 cp, and the sheet resistance is 0.005-0.05 ohm/sq/mil.
As an improvement of the scheme, the film thickness of the conformal line is 10-30 mu m.
The implementation of the invention has the following beneficial effects:
The conformal line of the invention realizes the efficient and large-batch formation of the high-precision and high-reliability conformal line on the curved carrier of various materials by manufacturing the grooves, forming the shielding layers and mutually matching the conductive materials.
According to the invention, the curved surface carrier is divided into the pattern area and the non-pattern area through the grooves, the conductive material is limited to be only positioned in the pattern area through the shielding layer, the conductive material is effectively prevented from being diffused, the smoothness and the precision of the edges of the conformal lines are improved, and finally the conductive material realizes efficient and large-batch conformal line manufacturing through a spraying method.
In addition, the conductive material can be widely applied to common plastic materials, such as ABS, PC, ABS+PC and other plastic base materials, and the sprayed surface is flat and smooth, which is obviously superior to the rough surface effect of the LDS technology.
Drawings
Fig. 1 is a flow chart of the method for manufacturing the high-efficiency curved surface conformal line.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent. It is only stated that the terms of orientation such as up, down, left, right, front, back, inner, outer, etc. used in this document or the imminent present invention, are used only with reference to the drawings of the present invention, and are not meant to be limiting in any way.
Referring to fig. 1, fig. 1 is a manufacturing flow chart of a manufacturing method of a high-efficiency curved surface conformal line, and the manufacturing method of the high-efficiency curved surface conformal line provided by the invention comprises the following steps:
S1, manufacturing a contour of a conformal line on a curved carrier, and dividing the curved carrier into a graph area and a non-graph area;
S2, forming a shielding layer on the non-pattern area;
s3, placing a conductive material on the pattern area to form a conformal line;
s4, removing the shielding layer.
In the step S1, the curved surface carrier is made of one or more selected from PC resin, ABS resin, PA resin, LCP resin, POM resin, PPO resin, PI resin, PP resin, PET resin and glass fiber, preferably PC resin and/or ABS resin; wherein the thermal deformation temperature of the PC resin is 130-140 ℃, and the thermal deformation temperature of the ABS resin is 93-118 ℃.
The curved carrier material is favorable for mass production and has low cost, and the curved carrier of the LDS technology needs to be made of a metal composite material and has higher cost.
The curved surface carrier of the present invention may be any 3D three-dimensional member having a curved surface structure, and is not particularly limited thereto, and the curved surface carrier may be, for example, a housing, an internal support, an internal member, or the like of an intelligent home appliance such as a mobile phone, an intelligent watch, a tablet pc, an automobile, a lamp, a sweeper, or the like, but is not limited thereto, and may be selected according to actual needs.
The method for manufacturing the outline of the conformal line on the curved carrier in the step S1 comprises the following steps:
Forming a groove on the curved carrier by adopting a laser engraving method, wherein the groove divides the curved carrier into a pattern area and a non-pattern area; the width of the groove is 0.3-0.4 mm, and the depth is less than or equal to 3mm.
The groove is used for isolating the graphic area from the non-graphic area and is used as the position guide of the shielding layer, so that the manufacturing efficiency and the precision of the shielding layer are improved, and the precision of the conformal line of the graphic area is improved.
Wherein the grooves are used for isolating the pattern area and the non-pattern area, namely the curved carrier is divided into the pattern area and the non-pattern area by the grooves, wherein the shielding layer is formed in the non-pattern area, and the conformal line (such as an antenna) is formed in the pattern area. Preferably, the graphic region has a curved surface structure including one or more of a convex structure, a groove structure, and a slope structure. Conventional planar printing methods have difficulty printing conductive pastes on patterned areas of curved carriers. In addition, since the pattern area has a curved surface structure, it is difficult to form a circuit structure required for the present invention by the existing printing method.
In order to reduce the influence on the appearance and strength of the curved carrier and improve the accuracy of the shielding layer and the conformal line, the inventor researches and discovers that the requirements can be met when the width of the groove is 0.3-0.4 mm and is less than or equal to 3 mm. Preferably, the width of the groove is 0.3-0.35 mm, and the depth is 0.5-1.5 mm.
In particular, the width and depth of the groove can be adjusted by controlling the parameters of laser engraving, and in order to reduce the influence of the laser engraving on the performance of the curved carrier, the groove is engraved by adopting the low-energy laser parameters.
The method for forming the shielding layer on the non-pattern area in the step S2 comprises the following steps: and (3) placing the strippable glue on the non-pattern area in a spraying or smearing mode to form a shielding layer.
Since the grooves in step S1 have separated the curved carrier into the patterned areas and the non-patterned areas, the releasable adhesive can be quickly and accurately placed on the non-patterned areas of the curved carrier by the barrier action of the grooves.
Specifically, the strippable glue is placed on the curved surface carrier outside the pattern area by adopting a spraying or smearing mode so as to form the shielding layer. The shielding layer protects the non-pattern area, and can enable the conductive material to be accurately and rapidly arranged on the pattern area, so that high-precision conformal lines are formed in a large scale.
Compared with the shielding jig, the invention smears the strippable glue on the non-pattern area, thereby not only playing the whole shielding effect, but also meeting the size requirement of the conductive circuit (antenna) with the size precision within +/-0.1 mm. In addition, the viscosity of the strippable glue and the curved carrier is proper, so that the strippable glue can be adhered to the curved carrier to prevent the conductive material from penetrating into the non-pattern area, and can be conveniently stripped from the curved carrier, thereby improving the production efficiency.
It should be noted that, the viscosity of the peelable adhesive plays an important role in the effect of the shielding layer, if the viscosity of the peelable adhesive is too low, the peelable adhesive cannot be attached to a curved carrier effectively, especially at the edge position, and if the adhesive force at the edge position of the shielding layer is poor, edge warpage and unevenness occur, the flatness of the edge of the conductive circuit is affected, and thus the performance of the conductive circuit (antenna) is affected. However, too high a viscosity of the peelable glue can also affect the subsequent removal of the barrier layer. The study shows that the viscosity of the peelable adhesive is 500-1500 cp, and when the peeling force is less than 5N, the adhesive force between the shielding layer and the curved carrier can be required, and the subsequent removal of the shielding layer can be facilitated. Preferably, the viscosity of the peelable glue is 800-1200 cp, and the peeling force is 1-5N.
The strippable glue disclosed by the invention is aqueous polyurethane strippable glue, and has the characteristics of good leveling property, high drying speed, soft film forming and easiness in stripping.
The aqueous polyurethane strippable glue can be naturally dried or baked and dried. In order to improve the production efficiency, the shielding layer is preferably formed by a drying method. Wherein the baking temperature and baking time affect not only the formation quality of the shielding layer but also the formation efficiency thereof.
Preferably, the baking temperature of the aqueous polyurethane peelable glue is 60-80 ℃ and the baking time is 0.5-1 hour.
The waterborne polyurethane strippable glue with the baking temperature and the baking time is matched with the curved surface carrier on one hand, and the curved surface carrier is easy to deform if the baking temperature is too high on the other hand, so that the production efficiency is improved.
The method for forming the conformal line by placing the conductive material on the pattern area in the step S3 comprises the following steps:
s31, placing a conductive material in a pattern area by adopting a spraying or smearing mode;
S32, curing the conductive material to obtain the conformal line.
The manufacturing process of the conformal line is simple, high in efficiency, low in cost, free of reworking and suitable for mass production. Specifically, when spraying a large-area conductive line, a spray gun such as a W77/W71/W3 spray gun can be selected, and when spraying a small-area conductive line, a precise spray valve can be selected. In addition, the invention can also adopt a manual spray printing mode, can also adopt equipment such as a 6-axis robot or a 5-axis dispenser to realize automatic spray printing, can also accurately control the spray printing path and speed through a numerical control program, and can ensure the precision and uniformity of spray printing. In addition, the film thickness of the spray printing can be controlled by adjusting the spray printing speed or the flow of the spray gun, and the thicker the film thickness of the spray printing is, the higher the conductivity of the conformal line is.
Preferably, the film thickness of the conformal line is 10-30 μm. It is found that if the film thickness of the conformal line is less than 10 μm, the conformal line is liable to short-circuit on the curved surface structure and has low conductivity, which affects the conductive performance, while if the film thickness of the conformal line is too high, the installation of the curved surface carrier is liable to be affected, and the aesthetic property is reduced.
The viscosity, sheet resistance, metal type, particle size, content and the like of the conductive material play an important role in the adhesion force between the conformal line and the curved carrier, reliability, conductivity and precision, yield and production efficiency of the conductive material changing into the conformal line.
The invention adopts the spraying or smearing method to spray the conductive material on the pattern area of the curved carrier to form the conformal line, the process has simple operation and low requirement on equipment, and can spray in large area or realize the spraying of fine patterns by matching with the shielding layer, thereby
The viscosity of the conductive material not only meets the requirement of a spraying process, but also has good leveling property to form a conformal line with uniform film thickness, so that the viscosity of the conductive material cannot be too high, and meanwhile, the conductive material also has good adhesive force with a curved carrier, so that the viscosity of the conductive material cannot be too low. The viscosity of the conductive material is 200-300 cp, and the sheet resistance is 0.005-0.05 ohm/sq/mil.
The conductive material has good adhesive force and conductivity, and can be applied to curved carriers of various plastic substrates such as ABS, PC, ABS +PC. In order to meet the requirements of the conductive material, the conductive material of the invention adopts the water-based pure silver conductive paint.
The aqueous pure silver conductive paint uses silver particles as a conductive material, has good conductivity, and can meet the conductive requirements of various conformal lines and even antennas. In addition, the water-based pure silver conductive paint has excellent adhesive force, can withstand the test of a hundred-meter test standard, is tested by using 3m gummed paper, has no powder removal phenomenon, and can pass the test of a salt spray test standard 72H.
In step S4, the method for removing the shielding layer includes: and directly tearing away the shielding layer. The shielding layer can be torn away by hands, tweezers or a jig.
The conformal line of the invention realizes the efficient and large-batch formation of the high-precision and high-reliability conformal line on the curved carrier of various materials by manufacturing the grooves, forming the shielding layers and mutually matching the conductive materials.
According to the invention, the curved surface carrier is divided into the pattern area and the non-pattern area through the grooves, the conductive material is limited to be only positioned in the pattern area through the shielding layer, the conductive material is effectively prevented from being diffused, the smoothness and the precision of the edges of the conformal lines are improved, and finally the conductive material realizes efficient and large-batch conformal line manufacturing through a spraying method.
In addition, the conductive material can be widely applied to common plastic materials, such as ABS, PC, ABS+PC and other plastic base materials, and the sprayed surface is flat and smooth, which is obviously superior to the rough surface effect of the LDS technology.
The foregoing is a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention and are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The manufacturing method of the high-efficiency curved surface conformal line is characterized by comprising the following steps of:
s1, manufacturing a contour of a conformal line on a curved carrier, and dividing the curved carrier into a graph area and a non-graph area;
S2, forming a shielding layer on the non-pattern area;
s3, placing a conductive material on the pattern area to form a conformal line;
S4, removing the shielding layer.
2. The method for fabricating a conformal line with a curved surface according to claim 1, wherein the method for fabricating a contour of a conformal line on a curved carrier in step S1 comprises:
forming a groove on the curved carrier by adopting a laser engraving method, wherein the groove divides the curved carrier into a graph area and a non-graph area;
The width of the groove is 0.3-0.4 mm, and the depth of the groove is less than or equal to 3mm.
3. The method for manufacturing a conformal line with a high-efficiency curved surface according to claim 2, wherein the width of the groove is 0.3-0.35 mm, and the depth is 0.5-1.5 mm.
4. The method for fabricating a conformal line with a curved surface according to claim 1, wherein the method for forming a shielding layer on the non-patterned region in step S2 comprises: and (3) placing the strippable glue on the non-pattern area in a spraying or smearing mode to form a shielding layer.
5. The method for manufacturing a conformal line with a high-efficiency curved surface according to claim 4, wherein the viscosity of the peelable glue is 500-1500 cp, and the peeling force is less than 5N.
6. The method for manufacturing a conformal line with a high-efficiency curved surface according to claim 5, wherein the strippable glue is aqueous polyurethane strippable glue;
And/or the viscosity of the peelable glue is 800-1200 cp, and the peeling force is 1-5N.
7. The method for manufacturing a conformal line with a high-efficiency curved surface according to claim 6, wherein the baking temperature of the aqueous polyurethane peelable glue is 60-80 ℃ and the baking time is 0.5-1 hour.
8. The method of claim 1, wherein the disposing the conductive material on the pattern area in step S3 comprises:
s31, placing a conductive material in a pattern area by adopting a spraying or smearing mode;
S32, curing the conductive material to obtain the conformal line.
9. The method for manufacturing a high-efficiency curved surface conformal line according to claim 1 or 8, wherein the viscosity of the conductive material is 200-300 cp, and the sheet resistance is 0.005-0.05 Ω/sq/mil.
10. The method for manufacturing a conformal line with a high-efficiency curved surface according to claim 9, wherein the thickness of the conformal line is 10-30 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410049762.4A CN117913518A (en) | 2024-01-13 | 2024-01-13 | Efficient curved surface conformal line manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410049762.4A CN117913518A (en) | 2024-01-13 | 2024-01-13 | Efficient curved surface conformal line manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117913518A true CN117913518A (en) | 2024-04-19 |
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ID=90685376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410049762.4A Pending CN117913518A (en) | 2024-01-13 | 2024-01-13 | Efficient curved surface conformal line manufacturing method |
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| Country | Link |
|---|---|
| CN (1) | CN117913518A (en) |
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2024
- 2024-01-13 CN CN202410049762.4A patent/CN117913518A/en active Pending
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