TWI795948B - Sandpaper disk and its setting method - Google Patents

Abstract

A sandpaper disc and its setting method, which is the sandpaper disc is injected with humidity after the glue is cured and matured, or the wet sandpaper disc is formed before the glue is cured and matured during the forming stage of the sandpaper disc, and the wet sandpaper disc is passed through the shaping mold and the process of the shaping method , pressurize and shape the wet sandpaper disc into a well-balanced sandpaper disc. In this way, the balance of the sandpaper disc is improved, thereby improving the service life and safety of the sandpaper disc.

Description

Sandpaper disk and its setting method

The invention relates to a sandpaper disc and a shaping method thereof, in particular to a sandpaper disc shaping method which can improve the balance of the sandpaper disc, thereby improving the service life and safety of the sandpaper disc.

Press, the sandpaper disc for grinding is mainly composed of base material, glue and grit. Among them, the base material is mainly vulcanized fiber cardboard, which is used to support the structure of the whole sandpaper disc, and more than 97% is pulp, so it is easily affected by the humidity in the air. The adhesive is mainly resin, and the application of the adhesive is to bond the gravel and the base material together. The grit is an abrasive, mainly artificial ore sand, which is used to polish and process objects by the sharpness of artificial ore sand. When the sandpaper disk is formed, it is first to coat the surface of one side of the base material or the base plate with glue (ie gluing), then sprinkle gravel (ie sanding), and finally send it to curing equipment (such as an oven) Or put it at room temperature for a curing time (that is, the glue is cured and cured), so that the gravel is consolidated on the substrate. After the glue is cured and cured, it is then cut according to the required sandpaper disc specifications to complete the forming of the grinding wheel. The forming steps of the simplified sandpaper disc are as follows: gluing the base material→spraying sand→curing the glue agent→cutting→finishing. In addition to removing rust from metal surfaces, this sandpaper disc can also sand metal surfaces, cement, stone, wood, fiberglass, and a wide range of materials. The sandpaper disc cannot be used immediately after it is formed, and it must be equipped with a back pad and installed on operating tools such as an electric grinder or a pneumatic grinder before it can be used.

The base material of the sandpaper disc is vulcanized fiberboard, which is easily affected by the humidity in the air. For example, if the weather is too humid, the vulcanized fiberboard will absorb moisture in the air, resulting in deformation of the finished sandpaper disc. If the deformation of the sandpaper disc is very serious, it cannot be installed on operating implements such as grinders. Even if it is forced to be installed on an operating tool such as a grinder, the deformed sandpaper disc is out of balance due to the balance, and it will rotate at a high speed driven by the operating tool, which will cause violent shaking and is prone to danger. Moreover, the abrasive grit of the deformed sandpaper disc cannot be evenly attached to the processed object, resulting in uneven consumption of grit, waste and affecting the service life of the sandpaper disc.

In order to overcome the deformation of the above-mentioned sandpaper discs, the industry generally adopts the method of strengthening the packaging to reduce the impact of moisture in the air on the sandpaper discs. However, the material of the packaging has a lot to do with the effect of blocking air, such as using shrink film to block Air humidity, its barrier effect is the worst, because the shrink film still has many small holes for air to circulate. The air humidity barrier effect is better than the zipper bag, which can be reused by customers. However, even if you use a zipper bag to isolate the air, there is still no guarantee that the sandpaper disc will not be deformed for a long time. Because the gravel (artificial ore) of the sandpaper disc is quite sharp, the gravel is likely to rub against the packaging bag during transportation and handling, and the packaging bag will be cut, causing air moisture to enter. Therefore, prevent the sandpaper disc from being damp and deformed with a zipper bag, and it is still not a solution to the deformation of the sandpaper disc due to air moisture.

In view of the fact that the known sandpaper discs are easily deformed due to the influence of moisture in the air after forming, the deformation is not only related to the storage method of the sandpaper discs, but if the sandpaper discs can be shaped and then pressurized, the The deformation rate is relatively reduced, and the balance of the sandpaper disc is improved. Therefore, it is designed and improved, and then the present invention is produced.

The main purpose of the present invention is to provide a sandpaper disk that can improve the balance of the sandpaper disk and is not easily deformed and its shaping method.

The main feature of the present invention is that when the sandpaper disc is formed, after the glue is cured and matured, the moisture is injected into the wet sandpaper disc before the glue is cured and matured in the forming stage of the sandpaper disc. Wet sandpaper discs are pressure-set. In this way, the balance of the sandpaper disc is improved, thereby improving the service life and safety of the sandpaper disc.

Referring to FIGS. 1 and 2 , the sandpaper disc 1 of the embodiment of the present invention is composed of a substrate 10 , glue 11 and gravel 12 . Wherein the substrate 10 can be vulcanized fiber cardboard; the glue 11 can be resin; the gravel 12 is an abrasive and can be artificial mineral sand. The gravel 12 is fixed on a surface of the substrate 10 through the glue 11 . The forming step 2 of the sandpaper disc 1 is shown in FIG. 3 .

Step 1, pulling out the roll material of the base material 10 or the plate material of the base material 10, and cutting 20, cutting it into the desired shape of the prefabricated base material of the sandpaper disc 1.

Step 2, coating the surface of the prefabricated specification base material 10 with glue 11 to carry out gluing 21 .

In step 3, the gravel 12 is evenly sprinkled on the surface of the prefabricated specification base material containing the glue 11 to perform sanding 22 .

In step 4, the glue 11 is matured and cured 23 by curing equipment (such as an oven) or placed at room temperature for a curing time, so that the gravel 12 is consolidated on the prefabricated substrate, and the grinding wheel is completed.

The above-mentioned steps 1-4 belong to the forming steps of the sandpaper disc 1, and the inventor has filed another application. The shaping method 3 of the sandpaper disc 1 of the present invention is mainly to carry out the following shaping steps after the sandpaper disc 1 is formed, as shown in FIGS. 3-6 .

In the shaping step 1 , humidity 30 is injected into the formed sandpaper disc 1 , that is, the moisture content of the paper substrate 10 of the sandpaper disc 1 is increased. Put the sandpaper disc 1 into an environment with high humidity to allow the paper substrate 10 of the sandpaper disc 1 to absorb moisture, thereby improving the elasticity of the sandpaper disc 1 so that it can withstand a higher pressing weight during the shaping and pressing process. If the paper substrate 10 of the sandpaper disc 1 does not absorb enough moisture to carry out gravity setting and pressing, the paper substrate 10 of the sandpaper disc 1 is prone to breakage during the pressing process because it has no elasticity and high hardness. The sandpaper disc injected with humidity is referred to as wet sandpaper disc 1a.

In the shaping step 2, pressure setting 31 is performed on the disc 1a containing wet sandpaper. A shaping die 4 is set, and the shaping die 4 is based on the desired sandpaper disc 1 specification, and has a concave arc depth in the middle, so that the sand paper disc 1 after shaping becomes a flying saucer shape. When pressing and shaping 31, the wet sandpaper discs 1a that have been injected with humidity are stacked between the two shaping molds 4, and the center rod 40 runs through the middle to prevent the wet sandpaper discs 1a from slipping. In application, 1 to 20 pieces of wet sandpaper discs 1a can be placed between the two shaping molds 4, and the central rod 40 can pass through and fix multiple sets of shaping molds 4 and wet sandpaper discs 1a, and then the central rod 40 Set the tooth surface at the end and fix it with the nut 41 to fix the whole stack of wet sandpaper discs 1a to avoid bouncing off. After that, as shown in Figure 5, use auxiliary tools, such as air compressors, hydraulic presses, air pressure wrenches, electric wrenches, etc., to apply pressure to the uppermost shaping mold 4 to shape and press the sandpaper disc. Or as shown in FIG. 6 , the entire stack of wet sandpaper disks 1 a is pressed and shaped by rotating the nut 41 in a pressing manner. Therefore, besides the above-mentioned air compressor, hydraulic machine, air wrench, electric wrench, etc., the auxiliary tool for pressurization can also be achieved by pressing the central rod 40 with the screw nut 41 .

In the shaping step 3, the dehumidification and drying treatment 32 is performed on the wet sandpaper disc 1a that has been shaped under pressure. After the wet sandpaper disc 1a is pressed together by the shaping mold 4, put it into an oven or pass through a dehumidification device to adjust the moisture content of the paper substrate 10 of the sandpaper disc 1, and then take it out when the moisture content of the sandpaper disc 1 reaches a predetermined value. The sandpaper disc 1 needs dehumidification and drying treatment 32 because the moisture content of the paper base material 10 needs to be maintained at a balance point. If the moisture content of the paper base material 10 is too low, the sandpaper disc 1 is installed in the operating machine tool (grinder) and rotates at a high speed. , easy to break and cause danger; if the moisture content of the paper substrate 10 is too high, the sandpaper disc 1 will be too soft, and it will be easily deformed for long-term storage.

After the above-mentioned shaping steps are completed, the sandpaper disc 1 is packaged 33 .

Next, please refer to FIG. 7 , which is the second embodiment of the method for shaping the sandpaper disc 1 of the present invention. The sizing method of the second embodiment of the present invention is in the step 4 of the step 4 of the forming method 2 of the sandpaper disc 1. The glue 11 is matured and solidified 23 stages. Before the glue 11 is not fully matured and solidified 23, because the glue 11 has not yet After solidification, the sandpaper disc 1 is still elastic and will not break when the sandpaper disc 1 is pressurized. At this time, the sandpaper disc is as previously called the wet sand paper disc 1a, and the wet sand paper disc 1a is subjected to the above-mentioned shaping step 2 , 3 operations, still can complete the shaping of sandpaper disc 1. In addition, before the glue 11 is matured and solidified, the wet sandpaper disks 1a are stacked together and pressed together to form a shape, and during the subsequent dehumidification and drying treatment 32, the wet sandpaper disks 1a are likely to all stick together. To avoid sticking together of the wet sandpaper disc 1a, a release agent can be sprayed on the back of the paper substrate 10 containing the wet sandpaper disc 1a (or a release agent can be sprayed on the sand planting surface) in advance to prevent the wet sandpaper disc 1a from sticking. together.

After the sandpaper disc 1 of the present invention is shaped by the above-mentioned shaping method, it has at least the following advantages and effects in application:

1. The sandpaper disk 1 is flying saucer-shaped, and the wet sandpaper disk 1a is pressurized and shaped, and has good balance. It is installed on the operating machine (grinder) and rotates at high speed, so it is less likely to shake. Moreover, the grit 12 (artificial ore) on the sandpaper disc 1 can be evenly attached to the surface of the object to be processed, and the grit (abrasive) 12 is evenly consumed to achieve the best use efficiency.

2. After the sandpaper disc 1 is finalized, the balance is good, so that when the sandpaper disc 1 rotates at a high speed driven by the operating equipment, the safety and reliability are improved, and the risk of industrial safety and occupational accidents is reduced.

To sum up, this invention is not only novel but also can be used by industry. It is really convenient to file an invention patent application according to the law, and kindly ask for the examination and approval of the patent.

1: sandpaper disc 1a: with wet sandpaper disc 10: Substrate 11: Glue 12: Grit 2: Forming step 20:Cut 21: Gluing 22: sanding 23: The glue is matured and cured 3: stereotype method 30: Inject Humidity 31: Pressure setting 32: Dehumidification and drying treatment 33: Packaging 4: Shaping mold 40: center pole 41: Nut

Shown in Fig. 1 is the top view of the sandpaper disc of the embodiment of the present invention. FIG. 2 is a sectional view of the sectional line 2s-2s in FIG. 1 . Fig. 3 is a step diagram of the first type of pressure setting in the embodiment of the present invention. Fig. 4 is a cross-sectional view of a pressure setting die according to an embodiment of the present invention. Fig. 5 is a structural diagram of the first type of pressurized shaping according to the embodiment of the present invention. Fig. 6 is a structural diagram of the second type of pressurized shaping according to the embodiment of the present invention. Fig. 7 is a diagram showing the steps of the second type of pressurization and shaping according to the embodiment of the present invention.

2: Forming step

20:Cut

21: Gluing

22: sanding

23: The glue is matured and cured

3: stereotype method

30: Inject Humidity

31: Pressure setting

32: Dehumidification and drying treatment

33: Packaging

Claims (7)

A method for setting the shape of the sandpaper disc is to inject humidity into the sandpaper disc after it is formed or the wet sandpaper disc before the glue is cured and matured during the forming stage of the sandpaper disc, and pressurize and shape the wet sandpaper disc in the following shaping method: A sizing mold is set, the shape of the sizing mold is matched with the desired shape of the sandpaper disc, and there is a concave arc depth in the middle, so that the sandpaper disc after sizing is shaped like a flying saucer; The wet sandpaper-containing discs are stacked and placed between each two shaping molds, with a central rod penetrating through the middle, and the pressing auxiliary tool is used to press the shaping molds, so that the wet sandpaper-containing discs are shaped; Carry out dehumidification and drying treatment to the wet sandpaper disc after being pressurized and shaped, and then pack it. The method for shaping the sandpaper disc as described in claim 1, wherein the sandpaper disc is formed and then injected with humidity, and the formed sandpaper disc is placed in an environment with high humidity, so that the base material of the sandpaper disc absorbs moisture to form the sandpaper disc. described with wet sandpaper discs. The sizing method of the sandpaper disc as described in claim 1, wherein the wet sandpaper disc before the glue is cured and matured, the back of the base material of the wet sandpaper disc or the sand planting surface is sprayed with Release agent. The shaping method of the sandpaper disc as described in claim item 1, wherein the two ends of the central rod have tooth surfaces respectively, and the tooth surfaces have nuts, and the setting molds at the two ends of the central rod are positioned against and positioned, and the rotating the The nut compresses the shaping die, and the combination of the nut and the central rod is also the pressurization auxiliary tool. The sizing method of the sandpaper disc as described in Claim 1, wherein the pressurized auxiliary tool is driven by power. A sandpaper disc is composed of a paper substrate, glue and gravel, and the gravel is fixed on a surface of the substrate through the glue, wherein the shaping method of the sandpaper disc is based on claims 1 to 5 Finished by any one of the above-mentioned shaping methods. The sandpaper disc as described in claim 6, wherein the sandpaper disc is completed with the following forming steps: Step 1, pulling out the coiled material of the base material or the flat material of the base material, cutting, and cutting into the desired prefabricated specification base material shape of the sandpaper disc; Step 2, brushing the glue on one surface of the above-mentioned prefabricated specification base material to carry out gluing; Step 3, spreading the gravel evenly on the surface of the prefabricated specification base material containing the glue, and performing sanding; Step 4: Mature and cure the glue with curing equipment or at room temperature for a curing time.

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