Flexible printed circuit (FPC) etching reinforcing sheet glue aligning process

Abstract

The invention relates to the technical field of FPC (Flexible Printed Circuit) processing technologies, and particularly discloses an FPC etching reinforcing sheet glue aligning technology which comprises the following steps: step 1, preparing a base material, and preparing a reinforcing plate, an etching solution and gummed paper; secondly, gummed paper is processed, and the gummed paper is processed into the preset size through equipment; step 3, etching and forming: etching and forming the reinforcing plate to form a required shape and a preset size; step 4, pressing and glue breaking: attaching the processed gummed paper to a reinforcing plate which is formed by etching, performing false pressing and fixing, placing a silica gel pad below the reinforcing plate, placing pressing paper above the gummed paper, pressing and glue breaking through a roller, and utilizing the thickness difference between the reinforcing plate and the gummed paper and the filling effect of the pressing paper to cut off the glue. And the gummed paper is extruded and broken along the edge of the reinforcing sheet. According to the invention, the deviation risk caused by the instability of the precision of the laser equipment and the dimensional tolerance of the reinforcing sheet can be effectively solved, the quality is stable, the labor efficiency is higher, and the quality control can be better carried out.

Description

Technical Field

[0001] The invention relates to the technical field of FPC processing technology, and in particular to a FPC etching reinforcement sheet gluing process. Background Art

[0002] FPC (Flexible Printed Circuit) etching reinforcement sheet gluing is an important step in the FPC manufacturing process.

[0003] FPC etching reinforcement sheet is usually made of stainless steel through etching process, and is used to strengthen the mechanical strength of FPC. It is usually pasted to a certain position or area of ​​FPC to increase its thickness and strength, and facilitate surface mounting of parts, etc.

[0004] The existing FPC etching reinforcement sheet gluing process is to glue the entire etched reinforcement sheet, and then use laser equipment to locate and cut along the edge of the product to achieve the effect of gluing design.

[0005] However, this method is affected by the positioning and cutting accuracy of the laser equipment, as well as the dimensional tolerance of the etched reinforcement sheet itself. This results in glue debonding or glue overflow on the reinforcement sheet after laser cutting, which increases the manpower and workload for subsequent inspections. There is also a risk of defective products being missed and outflowed, which cannot meet production needs. Summary of the invention

[0006] In view of the defects of the above-mentioned prior art, the present invention provides an FPC etching reinforcement sheet gluing process, which can effectively solve the deviation risk caused by the instability of laser equipment precision and reinforcement sheet size tolerance. The quality is stable, the manual inspection efficiency in the later stage is higher, and the labor cost and labor intensity are effectively reduced. The quality control can be better carried out to meet the production needs.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is:

[0008] The FPC etching reinforcement sheet glue process includes the following steps:

[0009] Step 1: Prepare the substrate, reinforcement plate, etching solution and adhesive tape;

[0010] The second step is to process the adhesive tape into a predetermined size through the equipment;

[0011] The third step is etching and forming, in which the reinforcing plate is etched and formed into the required shape and predetermined size;

[0012] The fourth step is to press and cut the glue. Stick the processed adhesive tape on the etched reinforcement plate and perform false pressing to fix it. Place a silicone pad under the reinforcement plate and press paper on the adhesive tape. Use rollers to press and cut the glue. Use the thickness difference between the reinforcement sheet and the adhesive tape and the filling effect of the press paper to squeeze the adhesive tape off along the edge of the reinforcement sheet.

[0013] In the above description, as a preference, the fourth step includes a fifth step, that is, coating the rubber surface. The upper side of the reinforcing plate after the roller is a rubber surface, and the lower side is a stainless steel surface. After the bottom film of the upper rubber surface is torn off, a release film is covered.

[0014] In the above description, as a preference, the fifth step further includes a sixth step of discharging the adhesive tape, turning over the reinforcing plate covered with the release film so that the stainless steel sheet faces upward, and discharging the adhesive tape after the adhesive is cut.

[0015] In the above description, as a preference, the sixth step further includes a seventh step, in which the steel surface is coated with a release film. After the adhesive paper is discarded, the stainless steel surface is covered with a layer of release film, and then turned over again with the adhesive surface facing upward, and the release film covering the adhesive surface is torn off.

[0016] In the above description, as a preferred embodiment, the seventh step also includes an eighth step, inspection, which is carried out by visual inspection. If there is no foreign matter or dirt on the adhesive surface and no bright edge on the edge, it is an OK product.

[0017] In the above description, preferably, in the second step, the adhesive tape processing includes:

[0018] Adhesive paper slitting, using a slitting machine to slit the adhesive paper into a predetermined width size;

[0019] Cut the adhesive tape into sheets by using a die-cutting machine to cut the strips into predetermined lengths.

[0020] In the above description, as a preference, the slitting machine adopts a peeling and laminating circular knife slitting machine, and the die-cutting machine adopts a high-speed precision die-cutting machine.

[0021] In the above description, preferably, the release films in the fifth step and the seventh step are both acrylic release films.

[0022] In the above description, preferably, the adhesive tape is conductive adhesive tape.

[0023] The beneficial effects of the present invention are as follows: the processed adhesive tape is attached to the etched reinforcement plate, falsely pressed to fix it, a silicone pad is placed under the reinforcement plate, and pressing paper is placed above the adhesive tape, and the adhesive is pressed and cut by a roller, and the thickness difference between the reinforcement sheet and the adhesive tape and the filling effect of the pressing paper are utilized to squeeze the adhesive tape along the edge of the reinforcement sheet, which can effectively solve the deviation risk caused by the instability of the laser equipment accuracy and the reinforcement sheet size tolerance, and avoid the carbonization phenomenon on the edge of the adhesive tape caused by laser cutting, the quality is stable, the efficiency of manual inspection in the later stage is higher, the labor cost and labor intensity are effectively reduced, and the quality control can be better performed to meet the production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 : is a schematic diagram of a flow chart of an embodiment of the present invention; DETAILED DESCRIPTION

[0025] In order to more clearly explain the structural features, technical means and specific purposes and functions achieved by the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0026] This embodiment: Figure 1 As shown, the FPC etching reinforcement sheet glue process includes the following steps:

[0027] The first step is to prepare the substrate, the reinforcing plate, the etching solution and the adhesive tape. The reinforcing plate is made of stainless steel sheet and the adhesive tape is conductive adhesive tape.

[0028] The second step is to process the adhesive tape into a predetermined size through the equipment. The adhesive tape processing includes:

[0029] The adhesive tape is slit by a slitting machine. The slitting machine uses a peeling and laminating circular knife slitting machine to process the predetermined width size. The width size is synchronized with the width size of the overall layout of the stainless steel sheet after etching;

[0030] Cut the tape into pieces. Use a die-cutting machine to cut the tape into pieces. The die-cutting machine uses a high-speed precision die-cutting machine to cut the predetermined length size. The length size is synchronized with the length size of the overall layout of the stainless steel sheet after etching.

[0031] The third step is etching and forming. The reinforcing plate is etched and formed. A layer of photosensitive material is coated on the surface of the stainless steel sheet. The coated photosensitive material is exposed to ultraviolet light so that the photosensitive material absorbs light energy and undergoes a chemical reaction to form a corrosion-resistant protective film. The exposed stainless steel sheet is developed to remove the unexposed photosensitive material to expose the metal part to be etched. The metal is corroded with an etching solution to form the desired shape and predetermined size.

[0032] The fourth step is to press and cut the glue. The processed adhesive tape is attached to the etched reinforcement plate, and false pressing is performed to fix it. A silicone pad is placed under the reinforcement plate. The silicone pad plays a role of buffering and evenly distributing pressure. Pressing paper is placed above the adhesive tape. The pressing paper has a certain thickness and hardness. It is used to fill the gap and help squeeze the adhesive tape during the pressing process. Pressing and cutting the glue are performed by rollers. The rollers are used to gradually apply pressure and move along the edge of the reinforcement plate. Due to the thickness difference between the reinforcement sheet and the adhesive tape, and the filling effect of the pressing paper, the adhesive tape will be squeezed and cut at the edge of the reinforcement sheet to complete the glue cutting. This method uses the thickness difference and the help of pressing paper to achieve neat breaking of the adhesive tape at the edge of the reinforcement sheet, improve the appearance quality and performance of the product, and can effectively solve the deviation risk caused by the instability of the laser equipment accuracy and the dimensional tolerance of the reinforcement sheet, and avoid the carbonization phenomenon caused by the laser equipment cutting on the edge of the adhesive tape. The quality is stable, and the manual inspection efficiency in the later stage is higher, which effectively reduces the labor cost and labor intensity, and can better carry out quality control.

[0033] Step 5: Reverse film on the rubber surface. The upper side of the reinforcement plate after the roller is the rubber surface, and the lower side is the stainless steel surface. After tearing off the bottom film on the upper rubber surface, cover it with a layer of acrylic release film. The acrylic release film has good high temperature resistance and a smooth surface, which can effectively prevent the rubber surface from sticking or contamination during subsequent processing.

[0034] Step 6: Remove the waste adhesive tape. Turn over the reinforcement plate covered with acrylic release film so that the stainless steel sheet faces upwards. Remove the excess adhesive tape and unnecessary parts. The removal can be done mechanically or manually.

[0035] Step 7: After the adhesive tape is removed, cover the stainless steel surface with another layer of acrylic release film, and then turn it over again with the adhesive surface facing up, tear off the acrylic release film covering the adhesive surface, and expose the adhesive surface;

[0036] Step 8. Inspection: Check visually. If there is no foreign matter or dirt on the rubber surface and no bright edges, it is a good product.

[0037] The present invention utilizes the thickness difference between the reinforcing sheet and the adhesive tape and the filling effect of the laminating paper to squeeze the adhesive tape off along the edge of the reinforcing sheet, which can effectively solve the deviation risk caused by the instability of the laser equipment precision and the reinforcing sheet size tolerance, and avoids the carbonization phenomenon on the edge of the adhesive tape caused by laser equipment cutting. The quality is stable, the efficiency of manual inspection in the later stage is higher, the labor cost and labor intensity are effectively reduced, and the quality control can be better performed to meet the production needs.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Therefore, any modification, equivalent replacement, improvement, etc. made to the above embodiment based on the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. FPC etching reinforcement sheet glue process, characterized in that: The following steps are involved: Step 1: Prepare the substrate, reinforcement plate, etching solution and adhesive tape; The second step is to process the adhesive tape into a predetermined size through the equipment; The third step is etching and forming, in which the reinforcing plate is etched and formed into the required shape and predetermined size; The fourth step is to press and cut the glue. Stick the processed adhesive tape on the etched reinforcement plate and perform false pressing to fix it. Place a silicone pad under the reinforcement plate and press paper on the adhesive tape. Use rollers to press and cut the glue. Use the thickness difference between the reinforcement sheet and the adhesive tape and the filling effect of the press paper to squeeze the adhesive tape off along the edge of the reinforcement sheet.

2. The FPC etching reinforcement sheet gluing process according to claim 1, characterized in that: After the fourth step, there is also a fifth step, which is to reverse the film on the rubber surface. After the reinforcing plate passes the roller, the upper side is the rubber surface, and the lower side is the stainless steel surface. After the bottom film on the upper rubber surface is torn off, a layer of release film is covered.

3. The FPC etching reinforcement sheet bonding process according to claim 2, characterized in that: The sixth step is also included after the fifth step, which is to dispose of the adhesive tape. The reinforcing plate covered with the release film is turned over so that the stainless steel sheet faces upward, and the adhesive tape after the adhesive is cut off is disposed of.

4. The FPC etching reinforcement sheet bonding process according to claim 3, characterized in that: After the sixth step, there is also a seventh step, which is to reverse the film on the steel surface. After the adhesive paper is discarded, the stainless steel surface is covered with a layer of release film again, and then turned over again with the adhesive surface facing up, and the release film covering the adhesive surface is torn off.

5. The FPC etching reinforcement sheet bonding process according to claim 4, characterized in that: After the seventh step, there is also the eighth step, inspection, which is carried out visually. If there is no foreign matter or dirt on the rubber surface and no bright edges, it is a OK product.

6. The FPC etching reinforcement sheet gluing process according to claim 1, characterized in that: In the second step, the adhesive tape processing includes: Adhesive paper slitting, using a slitting machine to slit the adhesive paper into predetermined width dimensions; Cut the adhesive tape into sheets by using a die-cutting machine to cut the strips into predetermined lengths.

7. The FPC etching reinforcement sheet bonding process according to claim 6, characterized in that: The slitting machine adopts peeling and laminating circular knife slitting machine, and the die-cutting machine adopts high-speed precision die-cutting machine.

8. The FPC etching reinforcement sheet gluing process according to claim 4, characterized in that: The release films in the fifth and seventh steps are both acrylic release films.

9. The FPC etching reinforcement sheet gluing process according to claim 1, characterized in that: The adhesive tape is conductive adhesive tape.

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