Wuhan Handern Granulation
DATE：2020/7/9 9:03:44 / READ： / SOURCE：This station
Wuhan Handern Granulation
The kneaded PVC dry mix can be directly used for extrusion molding, such as making pipes, profiles, blown film and other final products. However, most dry blends have to go through plasticizing and granulation processes to make composite granules. The pellets mentioned here refer to the whole pellets. There are five types of full-melt granules, namely random granulation, cylindrical granules, square granules, hot-cut granules 1 frozen abrasive. The most common are chaos-shaped pellets, square pellets, and hot-cut pellets. www.handern.com Non-woven equipment
1. Cylindrical pellets
A bunch of round strips that are not bonded together are extruded through a perforated daily die, and are cut with a straight knife pelletizer. The parallel strip is pulled by the clamping roller fixed on the bottom knife, and cut into a uniform length with a rotating flying knife. Generally, one-step immersion in the thermostat water trace can fully supply the required hardness of the cutting material. www.handern.com Non-woven equipment
2. Hot cut pellets
The production of cylindrical bead pellets by the hot-cutting compound method is very popular in the field of polyolefins, and is particularly suitable for hard PVC pelletization in the PVC industry. www.handern.com Non-woven equipment
The bead is formed by sweeping the surface of the template with a rotary knife when the composite material is extruded from the porous die. The length of the cut pellets can be changed by adjusting the extrusion speed and blade speed. Cutting needs to be carried out in the cooling medium to prevent the pellets from drying up with each other. Cooling can be done by airflow, water spray or even submerging the pelletizing mechanism in the water. Multiple fruits are cooled by airflow and water spray. The advantages of this granulation method are uniform size, no need for shrinkage, extremely slow blade wear, no noise operation; no need for long cooling profiles; small footprint. The same pelletizer has different die expansion and melt elasticity. The shape and size of the hot-cut beads vary with the mixture used. www.handern.com Non-woven equipment
3. Cube pellets
In the composite pellets of different shapes, the proportion of square pellets is quite large. It adopts a double-roller type refining machine to make the composite material into a continuous and flat strip material, and then adds the strip material to the cutting machine to cut into square pellets. The cutting control machine is equipped with a device for cutting the material in the longitudinal direction and using it to cut the east material. This method is difficult to handle very soft compounds. At present, the common method of manufacturing block materials is to use a stepped pelletizer. Under normal circumstances, a small amount of fine powder and granules will be formed and should be removed. Since solid materials are more difficult to cool uniformly than strips, the cooling process is longer regardless of whether the water meter or mist system is used. www.handern.com Non-woven equipment
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