The Grain Cutting Method Of The Granulation Line
- Jul 30, 2018 -

There are many different design of granulator, but all the granulator can be divided into two major categories: cold cutting system and surface hot cutting system. The main difference between the two is the timing of grain cutting process. The cold cutting system, at the end of the process, is cut from the solidified polymer particles, such as the cutting of the water drawing process, and in the mold surface hot cutting system, when the melting state polymers appear from the die, the particles are cut down and the pellets are cooled downstream.

The two granulating systems have their advantages and disadvantages.

Cold granulating system

The cold cutting system includes die, cooling zone (air cooling or water cooling), drying area (if water cooled) and pellet chamber. There are two main types of cold cutting system, that is, tablet pelletizer and strip pelletizer.

A: the polymer melted by a pelletizing machine is pressed from a mixer through a belt die or a roll mill to a certain thickness of the polymer sheet.  The sheet is solidified and cooled by a distance in the course of transportation, and then cut into round or square pellets in a chamber with a cutting knife.

Pelletizing is the oldest method for making granular materials, and can be applied to various polymers from nylon to PVC. Advantages: high production. It is reported that the precision is quite good, the granulation ability can reach 1843.69kg/h.. This is a cold cutting method, the noise emission ratio is higher than the method of the melting polymer particle. It is often a problem to generate powders by cutting solid polymer cutting tools. Some "polymers" can be seen in some polymers.

B: the history of the material pelletizer is almost as long as that of the pellet granulator. It includes die, cooling section (water bath or blower), drying section (if water cooled) and grain cutter. A polymer that is fused by a machine or gear pump is formed by a horizontal installation of the die. (the modern die is precisely machined and evenly heated to produce a stable quality bar). After discharging from the mouth shape, the material is cooled by a blower or air / vacuum facility or cooled by water bath. If water cooling is adopted, the strip must be dried through a drying section and forced by ventilation to remove moisture, and then the strips are sent to the pellet chamber. Using a pair of fixed knife and rotary knife shear action, the strip accurately cut into the required length. The diameter of the aggregate is 3.175 mm, 3.175mm long, and the edges are clear.

C: the traditional way to pull the strip is the stretch bar through the cooling section (the most commonly used is the water bath), which sometimes causes the drop of the strip or the inconsistency of the size. This is most commonly found in polymers with poor strength, such as polypropylene, polyester and nylon. When the strip falls, the material is scrapped, so the operator should pay close attention to it. If the strip is not consistent, the downstream pellets need to be sieved.


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