The grinding machine is the most widely adaptable, advanced and efficient grinding equipment. The grinding chamber is the narrowest, the clearance between the pullers is the smallest, and the grinding energy is the most intensive. With the high-performance cooling system and automatic control system, the continuous material processing can be realized and the production efficiency can be greatly improved.

Sand mill, also known as ball mill, is mainly used for wet grinding of chemical liquid products. According to its performance, it can be roughly divided into horizontal grinder, basket grinder, vertical grinder and so on. Mainly by the body, grinding drum, grinding disc (pole), grinding medium, motor and feed pump composition, feed speed by the feed pump control. The grinding medium of the equipment is generally divided into zirconia beads, glass beads, zirconium silicate beads and so on.

Sand mill belongs to wet ultra-fine grinding equipment, which is developed from ball mill. Pigment dispersion and grinding are widely used in ink production. There are different classifications of grinders:

According to the structure and shape of stirring shaft, it can be divided into disc type, rod type and rod-disc type.

According to the layout of grinding cylinder, it can be divided into vertical and horizontal.

According to the volume of the cylinder, it can be divided into laboratory, small, medium, large and super large.

According to the way of medium separation, it can be divided into static and dynamic separating grinder.

According to the energy density (installed power per unit volume), it can be divided into low/high energy density grinders.

In the production of different kinds of ink, the structure of grinding machine is different. Probably follow the following rules: gravure ink production generally uses pins (5-50 liters) or disc grinders (10-100 liters). Rotary offset printing ink generally uses vertical bar type (5-130 liters) or horizontal disc type grinder (60-500 liters), while the production of ultra-high viscosity sheet paper ink often uses conical grinder or three-roll machine with high energy density. Spray-painting inks (ink and pigment solvent) generally use pin-and-rod (horizontal or vertical) with high energy density and centrifugal turbine rotors (new patented products).

Compared with ball mill, roller mill, colloid mill and other grinding equipment, the grinding machine has the advantages of high production efficiency, strong continuity, low cost and high product fineness. The technological conditions vary greatly. The fineness requirement can be adjusted and classified by adding or subtracting grinding media.

Generally, there are vertical grinder, horizontal grinder, basket grinder, double cone bar grinder, nanometer horizontal grinder. In addition to the vertical grinder using ordinary 2-3/3-4 mm glass beads, other equipment uses 0.8-2.4 mm zirconia beads.