Application and Characteristics of Water Sandpaper

Water sandpaper is mainly used for grinding and polishing automobiles, furniture, leather, household appliance shells, and mechanical parts. It has the characteristics of wet grinding, high surface smoothness of the workpiece, and no dust contamination during operation. Abrasive paper also plays a big role in model making, such as eliminating water gates on parts, polishing parts notches cut from runners, and sometimes using fine abrasive paper to remove the gloss of paint, remove the oxide layer of metal parts, and restore the original metallic luster of the metal parts. Polishing with oil on water sandpaper can give wooden models a soft gloss.

The unit of abrasive paper is the number of particles per inch unit length (Cw), (usually referred to as "grit" or "grade"). Therefore, 500Cw and 800Cw refer to the number of particles arranged within one inch length, and the larger the value, the finer the abrasive paper. Coarse abrasive paper should be operated with gloves to avoid leaving small cuts on the fingers. 2000-grit water sandpaper is used to polish car paint scratches. The steps are as follows: soak the sandpaper in water, and gently polish the scratch. At this time, the scratch will lose its gloss, and then use a polishing machine to restore it, and finally wax it.

Principle of water sandpaper

Generally, after n grains of sand are rubbed on the surface of an object, there are 2^n possibilities for each small piece to be worn off, and each possibility is the same. Because after the friction of one grain of sand, each small piece of the object is on average worn off by half, and after the friction of n grains of sand, each small piece is on average worn off by n/2 parts. From the perspective of possibilities, it can be calculated that each small piece is most likely to be worn off by about n/2 parts. For example, when n=10, the possibility that each small piece will be worn off by 4 to 6 parts is 672/1024. When n=10000, the possibility that each small piece will be worn off by 4900 to 5100 parts is approximately 84%, and the possibility that each small piece will be worn off by 4800 to 5200 parts is approximately 99.54%.

Since there are many sand grains on a piece of abrasive paper, whenever a sand grain rubs against the surface of an object, each small piece of the object has been rubbed by many sand grains, and after multiple friction, the value of n is very large, and each small part is actually very small and differs in friction by several sand grains, which can be neglected. Therefore, rough abrasive paper can polish the object.

Function of water sandpaper

Amazing uses of water sandpaper in daily life - use 200, 400, and 600-grit water sandpaper to polish the teeth of a horn comb, it can dull the teeth of the comb; automotive beauty.

Advantages of water sandpaper

• Grinding efficiency increased by 30%-50%.

  
  

• Long lifespan, low heat generation during grinding.

  
  

• High strength, tear resistance.

  
  

• Good anti-clogging effect.

  
  

• Prevent abrasive paper from fading and affecting the surface quality of the workpiece.