CN110446366B

CN110446366B - Method for processing plate glass with functional circuit

Info

Publication number: CN110446366B
Application number: CN201910785447.7A
Authority: CN
Inventors: 江原泰藏
Original assignee: Cai Zanfeng
Current assignee: Cai Zanfeng
Priority date: 2019-08-23
Filing date: 2019-08-23
Publication date: 2022-06-28
Anticipated expiration: 2039-08-23
Also published as: CN110446366A

Abstract

The invention discloses a method for processing plate glass with a functional circuit, which comprises the following steps: manufacturing a functional circuit on the ground and strengthened large glass plate, covering a resin material on the glass as a protective film through a screen printing process, cutting the large glass into single glass, laminating the single glass, and then grinding. The invention adopts the resin protective film to replace a hydrofluoric acid protective film, has good protective function, is easy to clean, is harmless to human body and is environment-friendly. The resin material simplifies the procedure of the whole flow and reduces the production cost.

Description

Method for processing plate glass with functional circuit

Technical Field

The invention relates to the technical field of glass processing, in particular to a method for processing plate glass with a functional circuit.

Background

Glass plates with functional circuits, such as touch screen circuits (OGS), are widely used in electronic products such as mobile phones and tablet computers. In order to prevent the glass from being damaged when the glass falls down, a common process method is to use a chemical product, such as a potassium nitrate (KNO3) solution, for chemical strengthening treatment, and the mobile phone cover glass is also treated by using the chemical strengthening method. The current representative OGS glass processing flow mainly comprises the following two modes:

1. Large glass plate without strengthening → surface protection film production → cutting processing (cutting into single glass piece) → external peripheral grinding → cleaning → surface polishing → cleaning → chemical strengthening → cleaning → functional circuit production → decoration → cleaning → completion.

In the method, the manufacture of the functional circuit is in the last working procedure, a protective film is not needed to be arranged on the functional circuit, the damage condition of the functional circuit in the working process can be less, and the yield is high. Although this method is a good way, since it is produced piece by piece, a large number of the same type of equipment must be provided, and there are disadvantages of low production efficiency, difficulty in mass production, and high cost.

2. The method comprises the steps of grinding the large reinforced plate glass → cleaning → manufacturing of a functional circuit → decoration → manufacturing of a surface protective film (using hydrofluoric acid) → cutting processing (cutting into single glass pieces) → external periphery grinding → protective film peeling → cleaning → manufacturing of a hydrofluoric acid resistant protective film → processing of the periphery of the outer shape of the glass product (etching the periphery of the outer shape of the glass product by high frequency) → peeling of the hydrofluoric acid resistant protective film → cleaning → finished product.

In the second method, the large glass plate after polishing and chemical strengthening is first cleaned, a functional circuit and a decoration (if necessary, none) are produced, and then a protective film is produced to protect the surface of the functional circuit and the whole decoration surface. And cutting the back surface to make the large glass plate become a single small glass plate. The cut plate glass is then ground one by one using a grinder to make a tapered surface and a polished periphery, and then the protective film is removed using a solvent. After washing, a hydrofluoric acid-resistant protective film is printed on both sides of the glass, and then the periphery of the glass plate is etched with hydrofluoric acid to remove micro-cracks. And cleaning the etched glass with a solvent to obtain the fluorinated acid resistant protective film, and then cleaning with a cleaning solution to finish processing.

In the second method, since the functional circuit is already manufactured at the beginning, the surface of the functional circuit needs to be protected in the subsequent processing process, and a protective film layer is added to prevent scratches. In addition, in order to remove microcracks generated on the polished glass end surface with hydrofluoric acid (HF), a protective film resistant to hydrofluoric acid needs to be printed. Therefore, the protective film needs to be printed twice, and the protective film needs to be peeled off each time by using a solvent, and a cleaning process is also necessary. This method is also very costly.

In addition, the glass is subjected to acid etching by using hydrofluoric acid, the acid etching range is from the outer shape of the glass to the inner side within 0.2mm, the length of the microcrack including the broken edge removed by the hydrofluoric acid is 0.05-0.06mm, the depth is 0.015-0.02mm, and the position of the periphery of the glass plate to be aligned with the protective film is very high. Generally, the alignment position accuracy is required to be about 0.05mm, and if the alignment position accuracy is not required, micro cracks are likely to remain. If a defective product is mixed, there is a possibility that a problem such as ink bleeding occurs in the subsequent screen printing. Therefore, although mass production is possible, the physical strength of the product is very unstable.

In conclusion, how to avoid using hydrofluoric acid (HF) which is harmful to human body and environment in the production process, and at the same time, ensure high strength and stable physical strength of the produced glass substrate, reduce the reject ratio and reduce the cost is a technical problem to be urgently solved in the industry.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides a method for processing plate glass with a functional circuit. The glass product produced by the method not only meets the requirements on physical strength and stability, but also can improve the productivity and reduce the cost, and the used protective film is harmless to the working environment and personnel.

The invention provides a method for processing plate glass with a functional circuit, which comprises the following steps: manufacturing a functional circuit on the ground and strengthened large glass plate, covering a resin material on glass as a protective film by a screen printing process, cutting the large glass plate into single small glass plates, and laminating the single small glass plates and then grinding.

Preferably, the resin material is polyethylene glycol, and the thickness of the resin after printing and drying ranges from 0.01 mm to 0.2 mm.

In one embodiment, the processing method comprises the following steps:

step 1, grinding and strengthening a large-plate glass plate;

step 2, manufacturing a functional circuit on the large glass plate;

step 3, printing a resin material protective film on the large glass by using a silk-screen printing process

Step 4, cutting the large glass plate into single small glass plates;

step 5, laminating the single small glass plates, and pressurizing two surfaces of the glass plates after lamination to form a laminated block;

Step 6, peripheral grinding is carried out on the end face of the small glass plate laminated block;

step 7, laminating the small glass plate laminated blocks again;

step 8, grinding the end faces of the laminated blocks which are laminated for multiple times by using a hairbrush;

step 9, putting the laminated block into water to remove the protective film;

and 10, drying each separated small glass plate.

Preferably, in step 5, the thickness of the laminated block formed by laminating the single small glass plates is 10-20 mm.

Preferably, in step 7, the thickness of the plurality of small glass plate laminated blocks after being laminated again is 100-500 mm. Preferably, in step 9, the temperature of the water is 50 degrees or higher.

Preferably, in step 6, brush grinding is used, and the diameter of the fibers of the brush is larger than the gap between the small glass plate stacks.

Preferably, the brush for grinding uses pig hair, or nylon material, or rayon.

Compared with the prior art, the invention has the following beneficial effects:

the invention adopts the resin protective film to replace a hydrofluoric acid protective film, is harmless to human body and is environment-friendly;

2 the resin material has good protection function and is easy to clean, does not damage and corrode products, avoids the corrosion of glass and lines caused by traditional alkali liquor stripping, is quick and convenient to strip, is suitable for mass production, and saves manpower and material resources.

3 the application reduces the procedures of multiple cleaning, and simultaneously, single small glass plates are laminated and processed, so that the production cost is reduced.

Drawings

FIG. 1 is a process flow diagram of the method of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and examples. It should be understood that the following specific examples are only for illustrating the present invention and are not to be construed as limiting the present invention.

Cover glass for electronic products is originally common glass, and the surface of the cover glass reaches the requirement of an optical mirror surface after being ground and polished, but the surface of the cover glass is very fragile. Because the touch screen panel glass is thin, the requirement on surface flatness is high, the forming is difficult, the manufacturing process is much more complex than that of common flat glass, in the manufacturing process of the touch screen, the glass substrate is very easily scratched to a certain degree in a machine table or other operations from the procedures of splitting, profiling, CNC (computer numerical control) to polishing, and the scratching rate is generally more than 42%, the manufacturing cost of an enterprise is increased, and the productivity of the enterprise is restricted. Therefore, it is very necessary to apply various protective materials on the surface of the panel glass when the touch screen is processed. The protective layer requires that the subsequent cutting procedure, CNC engraving and processing procedure and brush grinding and processing procedure can still achieve good protection for the glass surface.

The existing glass protection mainly has three modes: firstly, sticking peelable glue, secondly sticking protective film and thirdly, printing protective ink. Wherein: the mode of pasting the peelable glue is not suitable for large-scale production and the edge can rise in the CNC engraving process, each piece needs to be torn off, and the efficiency is low. The mode of sticking the protective film is simple to manufacture and low in material consumption, but the problem of low efficiency is also faced. The printing protection ink mode is the optimal protection mode so far, is suitable for large-scale mass production, and has good protection effect. Then, the performance of the protective ink in the current market is immature, the film is not easy to fall off, the cleaning is difficult, the production time is greatly consumed in the mass production process, and the cost of manpower and material resources is increased.

After the three protection modes are finished, all layers of protection glue are required to be cleaned and removed. In the actual production, generally can't once only wash, need the staff to tear the protective layer by hand, not only work efficiency is lower, easily causes the staff hand to receive the corruption moreover. Furthermore, the three protection methods described above generally require the use of UV curing, which has the disadvantages: peeling is troublesome after UV curing, and hot water is used for peeling; can not be completely compatible and matched with post-process equipment; the cutting of the tape film cannot be achieved.

In the processing method of the plate glass with the functional circuit, the resin protective film is adopted to replace a hydrofluoric acid protective film, and the resin protective film is coated on the glass by adopting a screen printing process.

The resin protective layer has the following advantages:

(1) the resin is a neutral material, and is environment-friendly, safe and environment-friendly.

(2) Hot water is stripped after curing, neutral hot water does not damage and corrode products, corrosion of glass and lines caused by traditional alkali liquor stripping is avoided, and stripping is rapid, convenient, safe and environment-friendly. Is suitable for mass production, and saves manpower and material resources.

(3) Can be with the complete compatible cooperation of back process technology equipment, include: a is suitable for a cutter wheel cutting process (cutter wheel equipment with a slotting function at the front part of a cutting tool bit or cutter wheel equipment without the slotting function); c, adapting to fixed abrasive cutting (including CNC finishing stone machining, DICING saw blade machining and the like); d, floating abrasive cutting (comprising sand blasting cutting processing, pre-mixed water jet cutting processing, post-mixed water jet cutting processing) and the like.

(4) The cutting of the tape film can be realized. The resin protective layer can adapt to various process equipment to realize cutting with the film, the difficulty of protecting resin printing and the matching simplicity are reduced, and the resin protective layer can meet the requirements of large-scale production.

(5) The printing size requirements of different thicknesses can be realized. In the lamination process and the polishing process, different lamination gaps need to be set for different product polishing conditions. The printing thickness of the resin ranged from 0.01 to 0.2 mm.

(6) The self-positioning firmness can be realized after the protective resin is laminated. The lamination alignment of the glass is very simple, but the phenomenon of uneven stress or over-heavy stress can occur in the processing process, so that the product in the lamination alignment is deviated, and the yield of product processing is fluctuated. In general, a double-sided adhesive film having adhesiveness is replaced to be laminated, and thus, an original glass protective material must be peeled off, which results in a complicated process operation, an increase in cost, and a reduction in production efficiency. And the protection resin can realize the firm performance of self-align after the product is folded, and two same protection resins can form the self-adhesion phenomenon after the pressurized, the adhesion degree between the promotion product that can be very big prevents the condition that the product squinted in the course of working, guarantees product processingquality, saves the production and processing cost.

(7) Can adapt to the phenomenon of no conflict in the grinding process. The grinding mode of the product is mainly grinding and polishing by using a brush. The brush grinding and polishing is to grind and chamfer the end face of the laminated product by the brush wires through the rotation motion. The chamfering processing of the end face of the laminated glass is carried out, the brush wire is required to enter the gap of the laminated glass plate, the protective resin material forming the glass laminating gap has certain water solubility, the solvent performance can appear at the edge in the grinding processing process, and the edge chamfering processing of the product can not be carried out when the brush wire enters the laminating gap.

(8) The protective resin can be made in different colors and transparencies. Different subsequent processing technologies have different requirements, and the protective resin can be freely matched and changed according to the requirements of the cutting technology, so that the protective resin meets the requirements of each technology.

As shown in fig. 1, the specific process of the method for processing flat glass with functional circuit provided by the invention is as follows:

grinding and strengthening large glass plates → manufacturing a functional circuit → manufacturing a protective film by using resin → cutting processing (cutting into single glass plates) → laminating of single glass plates → peripheral grinding → laminating of glass plates again → brush grinding → peeling of protective film in warm water → finished product.

The core of the invention is that a resin protective film is adopted to replace a hydrofluoric acid protective film, and the resin protective film is coated on the glass by adopting a screen printing process. The protective film resin material used in the present invention is preferably POLYETHYLENE GLYCOL (POLYETHYLENE GLYCOL), which is difficult to dissolve at 30 degrees or less and easy to dissolve at 50 degrees or more. The thickness of the printed resin after drying is in the range of 0.01-0.2 mm.

The polyethylene glycol resin protective layer can be dissolved in hot water, and when a single glass plate or a plurality of glass plates are laminated, the resin protective layer can protect a printed product and can realize adhesion between the glass product and the glass product. The protective film can be used as an adhesive, and can also be used as a gap in lamination during brush polishing, thereby realizing gap sharing. By the secondary lamination, the number of the primary grinding processing is 10 to 50 times that of the single processing, which is very advantageous for the processing of the thin plate glass. In addition, the polyethylene glycol protective film resin is dissolved in hot water to form an organic compound, so that the polyethylene glycol protective film resin is harmless to human bodies and environment, and the material can be recycled and reused.

The thickness of the single small glass plates after being laminated once is 10-20mm, which depends on the width of the grinding stone. The thickness of the small glass plate laminated blocks after being laminated again is 100-500mm, which depends on the width of the brush.

Peripheral grinding is typically a taper angle grinding, and the present invention may be used with right angle grinding without taper angles.

The brush grinding and polishing are to grind the end face of the glass to form the glass with an angle at the edge. The contact angle and the contact pressure of the glass and the brush wires can be controlled by the size of the gap between the brush grinding and polishing and the glass and the size of the brush wires. The grinding amount of the brush is in direct proportion to the abrasive grain hardness and the size of the grinding agent with the rebound rate of the brush filaments.

The purpose of the brush grinding and polishing is to remove fine cracks around the glass product. The invention can remove the micro-cracks only by grinding the brush without using hydrofluoric acid, can realize the stability of the physical strength of the product and the batch production requirements of high quality and high production capacity, and has no harm to human bodies and environment because of not using hydrofluoric acid.

The protective resin can be peeled off using hot and warm water without any operation using a cleaning agent or a peeling agent. Stability of physical strength of the product and mass production requirements of high quality and high throughput are more easily achieved.

In one embodiment, the method for processing flat glass provided by the invention comprises the following steps:

step 1, grinding and strengthening treatment are carried out on a large glass plate.

And 2, manufacturing a functional circuit on the glass plate.

Since the functional circuit is weak to acid, alkali, damage and dirt, a protective film must be used.

And 3, printing a resin material protective film on the large glass by using a screen printing process.

And printing a protective resin on the surface with the functional circuit on the glass in a screen printing mode. The thickness of the printed resin after drying is within the range of 0.01-0.2 mm, and the same thickness can be kept in the same batch processing.

The back surface of the glass plate with the functional circuit can be printed with a protective film, and parts needing to be cut and processed later can be left on the protective film. The purpose of printing protective films on both sides of the glass plate is to protect the surface of the glass against scratches.

When double-sided printed glass is laminated, a certain gap is formed between the glass and the glass, and a screen-printed resin layer can also be used as a polishing spacer.

And 4, cutting off and processing.

In the cutting step, the protective film printed surface is cut by a cutter, and the large glass plate is cut into individual small glass plates.

And 5, laminating the single small glass plates.

In the individual glass sheet laminating step, the cut individual glass sheets are individually laminated and fixed. The plate glass is laminated in a row with the end face as a reference, the thickness of the lamination is in the range of 10-20mm, and the width of a grinding stone used for contour grinding in the next step is specifically selected and matched.

After the small glass plates are stacked, the glass plates and the glass plates form a certain gap and can keep flatness. For example, if the thickness of the protective film is 40 μ and two glass sheets are joined together, the gap between the glass sheets becomes 80 μ. Since the resins have adhesive properties therebetween, when the adhesive force is weak, they are soaked in water before lamination, or they are soaked in warm water and then laminated. After the single small glass plates are laminated, the two surfaces of the glass plates are pressed to form a square laminated block.

And 6, grinding the periphery.

The small glass plates are stacked to form a quadrangular stacking block, and the end faces of the stacking block are ground by a brush. In this step, the glass plate is ground at right angles without chamfering.

The purpose of brush grinding is to make a taper angle on the glass edge, and the process is important to control the gap between the glass and the glass, so that the correct thickness is ensured, and no error exists between the thicknesses. The fiber diameter of the brush as it grinds controls the shape of the edge angle at the gap between the glass sheet and the glass sheet.

And 7, laminating the small glass plate laminated blocks.

After the outer shape of the lamination block is ground, the lamination process is carried out again by taking the end face as the reference, and the lamination thickness is 100-500 mm. If the number of lamination blocks to be laminated again is too large, for example, in the case of a lamination thickness of 100mm or more, the glass plate must be fixed to enable high-precision processing.

And 8, grinding the brush.

The brush grinding equipment has a longitudinal and transverse type, and although two types of grinding methods are adopted, basically any type can be used, and the process can be compatible and connected.

The vertical brush grinding can be performed for one brush for the whole circumference, the number of the one-time grinding is small, and long-time grinding is needed. The glass sheets have a general processing capacity of 0.55mm, and the processing time is about 120 minutes (chemically strengthened glass sheets having a strengthening depth of about 10 μ).

In the case of a vertical brush polishing apparatus, the laminated glass is placed on a jig rotating in the vertical direction in the second laminating step, and pressure is applied from the top to the bottom to fix the laminated glass in a columnar state, and then brush polishing is performed from the left and right.

The horizontal brush grinding is to grind each edge and each corner independently. The glass laminated for the second time was placed on a fixing plate of a horizontal brush grinder, the laminated glass was fixed to the left and right of the laminated side, and brush grinding was started from the upper part. The processing capacity is 0.55mm glass at a time, 450-1000 pieces, one side processing time is 15-20 minutes, because the glass of the fixed plate is vertically fixed, the pressure on the glass can be uniformly applied with large pressure, the grinding force is stable, and the high grinding force can be obtained with high precision.

According to the contact method of the laminated glass and the brush, the shape from the end face to the chamfer is changeable, and the edge of the glass and the movement direction of the brush are adjusted according to different processing parameters and conditions. The directions can be relatively parallel grinding modes or right-angle grinding modes.

The control of the end face edge angle is controlled by the glass-to-glass gap and the diameter of the brush fibers. The diameter of the brush fibers must be larger than the gap between the glass and the glass. For example, the diameter of the brush fiber is set to be 0.4mm relative to the gap of 0.08mm glass, and after 30 minutes of brush grinding, a circular edge angle of 45 degrees is manufactured at the position of 0.15mm of the edge of the glass surface; alternatively, the diameter of the fibers of the squeegee was set to 0.3mm with respect to the gap of 0.08mm glass, and a circular edge angle of about 60 degrees was formed at 0.15mm of the edge of the glass surface after 30 minutes of squeegee polishing.

The brush for polishing is generally made of pig hair, nylon, or rayon. The brush is required to be made of a material having high heat resistance because the contact point between the brush and glass is heated in water because the brush has high hygroscopicity because the brush is required to have high rebound resilience and to keep the brush in a water-filled state. In the present invention, good results were obtained using PET (Polyster) which has a large rebound resilience and excellent heat resistance despite its low moisture absorption, and 66nylon fibers which have properties close to those of pig hair. Although the pig hair has good performance, softness and good elasticity, the pig hair also has the problems of uneven hair diameter, thinness and difficult use.

The following are comparisons of several fibers:

moisture absorption (%) of fiber Rate of rebound at service temperature (kg/mm2)

6nylon 10.7% 100 200-400

66nylon 8.5% 120 400-600

PP 0% 80 800-1000

PET 0.4-0.5% 140 1,100-2000

The abrasive powder generally uses cerium oxide (CeO2), and the present invention uses fused alumina (Al2O3) having a particle size of #8000 or more, silicon carbide (SiC), or cerium oxide (CeO 2). The hardness of cerium oxide was 6, the hardness of fused alumina was 9, and the hardness of silicon carbide was 9.5. The latter two materials have a higher hardness and a higher grinding power than cerium oxide.

Since cerium oxide has a specific gravity of 7.2, fused alumina has a specific gravity of 3.9, and silicon carbide has a specific gravity of 3.2, silicon carbide has a specific gravity of about half that of cerium oxide, and thus it is not easy to separate an aqueous dispersion from abrasive powder. Since cerium oxide has a large specific gravity in an aqueous dispersion, separation and sedimentation occur immediately in water.

Hardness comparison of grind powders (Mohshardness mohs hardness):

specific gravity of Mohs hardness

93.9 molten aluminium

Silicon carbide 9.53.2

Cerium oxide 67.2

The fused alumina and silicon carbide (SiC) are ground powders having a particle size of #8000 or more.

Combining the brush with the grinding powder: polyester fibers, alumina and silicon carbide are more abrasive than cerium oxide.

The following are the lapping test parameters:

the glass is 1mm, and the strengthening depth of the green plate strengthened glass is 12 u;

the moving speed of the glass is 1.5 mm/min;

the brush was rotated at a speed of 250mm in diameter and 235 m/min.

Cerium oxide fused alumina serving as polishing material

Nylon: 0.5-1 μm grinding allowance/min 1.5-3 μm grinding allowance/min

Pig hair: 1-1.5 mu m grinding allowance/min 2-3 mu m grinding allowance/min

Pet (polymer): 1.5-2 μm grinding allowance/min 3-4 μm grinding allowance/min

And 9, stripping the protective film.

After the grinding operation is finished, in order to simply remove the printed resin, the invention uses a material which can be dissolved in a small amount in cold water and can be completely dissolved in hot water, such as polyethylene glycol, the resin is difficult to dissolve below 30 ℃, is easy to dissolve above 50 ℃ and has no influence on human bodies. After the resin was dissolved, the general glass cleaning process, water cleaning, pure water cleaning, and slow hot water cleaning were performed, and the resultant was dried. No detergent is needed for cleaning. The resin dissolved by warm water can not be hardened and can be recycled.

The foregoing is considered as illustrative only of the embodiments of the invention. It should be understood that any modifications, equivalents and changes made within the spirit and framework of the inventive concept are intended to be included within the scope of the present invention.

Claims

1. A method for processing plate glass with a functional circuit is characterized by comprising the following steps: manufacturing a functional circuit on the ground and strengthened large glass plate, covering a polyethylene glycol resin material on glass as a protective film through a screen printing process, cutting the large glass plate into single small glass plates, stacking the single small glass plates, grinding the end faces by using a brush to form a taper angle on the edges of the small glass plates, then stacking the ground laminated plates again, grinding the end faces by using the brush to form a fillet on the edges of the small glass plates, wherein the fiber diameter of the brush is larger than the gap between the small glass plates.

2. The process of claim 1 wherein the polyethylene glycol resin material is printed to a dried thickness in the range of 0.01 to 0.2 mm.

3. The process of claim 1, comprising the steps of:

step 1, grinding and strengthening treatment are carried out on large-plate glass;

step 2, manufacturing a functional circuit on the large glass plate;

step 3, printing a polyethylene glycol resin material protective film on the large glass by using a screen printing process;

step 4, cutting the large glass plate into single small glass plates;

Step 6, grinding the periphery of the end face of the small glass plate laminated block by using a brush;

step 7, laminating the small glass plate laminated blocks again;

step 9, putting the laminated block into water to remove the protective film;

and 10, drying each separated small glass plate.

4. The process of claim 3 wherein in step 5, the individual glass sheets are laminated to form a laminated block having a thickness of 10 to 20 mm.

5. The process of claim 3 wherein in step 7, the thickness of the plurality of laminated glass panes is 100-500mm after the plurality of laminated glass panes are further laminated.

6. The process of claim 3 wherein in step 9 the water is at a temperature of 50 degrees or greater.

7. The process according to claim 3, wherein the brush for grinding is made of pig hair, nylon or rayon.