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What are the main auxiliary machines of plastic pelletizing production line?

September 21, 2023

Auxiliary equipments of plastic pelletizing production line mainly include payoff device, straightening device, preheating device, cooling device, traction device, meter meter, spark tester and take-up device. Extruder unit with different uses of its optional auxiliary equipment is not the same. Such as cut off, blow dryer, printing device.

Straightening device: plastic extrusion waste type of a common is eccentric, and the core of a variety of types of bending is one of the important reasons for insulation eccentricity. In the sheath extrusion, the sheath surface scratching is also often caused by the bending of the core. Therefore, a variety of extrusion unit in the straightening device is not less. Straighten the main type of device are: roller (divided into horizontal and vertical); pulley (divided into a single pulley and pulley group); stranded wheel, both drag, straightening, stabilizing tension and so on a variety of roles; pressure wheel (divided into horizontal and vertical) and so on.

Preheating device: Core preheating is necessary for insulation extrusion and sheath extrusion. For the insulation layer, especially thin insulation, can not allow the existence of air holes, the core in the extrusion package before the high temperature preheating can be clear of surface water, oil. For the sheath extrusion, its main role is to dry the cable core, to prevent the role of moisture (or moisture around the package cushion layer) so that the sheath in the possibility of air holes. Preheating can also prevent the plastic extrusion due to sudden cooling and residual internal pressure effect.

In the extrusion of plastic process, preheating can alleviate the cold line into the high-temperature head, pelletizing machine manufacturers in the die mouth in contact with the plastic when the formation of the disparity between the temperature difference, free from fluctuations in the temperature of the plastic and lead to fluctuations in the pressure of the extrusion, so as to stabilize the amount of extrusion, to protect the quality of the extrusion. Extrusion unit are used in electric heating core preheating device, the requirements of sufficient capacity and to ensure that the temperature rises quickly, so that the core preheating and cable core drying efficiency. Preheating temperature is subject to the constraints of the speed of release, generally similar to the head temperature on the line.

Cooling device: The molded plastic extruded layer should be cooled and shaped after leaving the machine head, otherwise it will be deformed under the action of gravity. The cooling method usually adopts water cooling, and according to different water temperature, it is divided into rapid cooling and slow cooling. Rapid cooling is cold water direct cooling, rapid cooling of plastic extrusion layer shaping favorable, but for crystalline polymer, because of the sudden hot cooling, easy to residual stress in the extrusion layer organization, resulting in cracking in the use of the process, the general PVC plastic layer using rapid cooling. Slow cooling is in order to reduce the internal stress of the product, the cooling water tank in sections placed in different temperatures of water, so that the product is gradually cooled down and shaped, PE, PP extrusion on the use of slow cooling, that is, after the hot water, warm water, cold water, three sections of cooling.

Henglande insists on the core value concept of flat twin extrusion automation, and its core products include isotropic parallel twin-screw intelligent equipments, drawbar pelletizing, filling, co-mingled modified water-ring hot-cutting, air-cooled die face hot-cutting, underwater pelletizing, and continuous densification extrusion production lines, which provide customers with overall solutions based on the intelligent production environment of rubber and plastics, and are committed to creating energy-saving, stable, and intelligent manufacturing application scenarios.