Jiangsu PE PE Extruder Extruder

Jiangsu PE PE extruder 3. The extruder heating and cooling apparatus for heating and cooling is a necessary condition for the plastic extrusion process can be carried out. (1) is now commonly used extruder is electrically heated, divided into resistance heating and induction heating, heating plate mounted on the fuselage, neck, each part of the handpiece. Heated by an external heating means of the plastic tube, allowed to warm to reach a temperature required for process operations. (2) cooling system is to ensure that the requirements of the plastic in the process temperature range settings. Specifically, in order to remove excess heat generated by friction shearing screw rotation to avoid overheating the plastic decomposition, scorch or stereotypes difficulties. Into a water-cooled barrel cooling and air-cooled two, most small and medium extruder using air is more appropriate, the use of large-scale water-cooled cooling or combination of two forms; water-cooled screw cooling centers mainly aimed at increasing the solid material delivery rate stable volume of the plastic, while improving product quality; but in cooling hopper, first, in order to strengthen the role of transport of solid materials, heating the plastic to prevent clogging of grain sticky discharge port, the second is to ensure the transmission part of the normal work. Second, the auxiliary units plastic extrusion auxiliary equipment including actinomycetes means straightening device, preheat devices, cooling devices, traction devices, meter, Spark Tester, take-up devices. Different uses extrusion unit of its optional auxiliary equipment are not the same. If there cutter, drying devices, printing devices. Straightening means: plastic extrusion waste type, the most common one is the eccentric, and various types of bending core is one of the important reasons insulated eccentric generation. In the jacket extrusion, surface scratching jacket often is caused by the bending of the cable core. Thus, various extrusion unit of straightening means is essential. The main types of straightening devices are: a drum (divided into horizontal and vertical); pulley (pulley and pulley into a single group); twisted wheel, and from drag, straightening, stable tension multiple roles; Pressure Wheel (divided into horizontal and vertical), etc. preheating device: Preheat the core extrusion for insulation and sheathing are necessary. For the insulating layer, especially a thin layer of insulation, can not allow the existence of pores, before the extruded core can completely remove surface moisture, oil at high temperature to warm up. For sheathing is concerned, its main role is to dry the core and prevent the moisture (or wrapped cushion of moisture) the action of the sheath may appear pores. Preheat also prevents extrusion of plastic due to quench the residual internal pressure. In the plastic extrusion process, the preheating temperature can eliminate the cold line into the nose, the poor die at a temperature difference at the contact with the plastic form, to avoid temperature fluctuations caused by plastic extrusion pressure fluctuations, thus stabilizing the extrusion rate guarantee extrusion quality. Extrusion units are used in electric heating wire core preheating device, requires a sufficient capacity and ensure rapid heating, the wire core preheating and drying the core efficiency. Preheating temperature by pay-speed constraints, generally similar to the head temperature. Cooling system: molded plastic extruded layer after leaving the nose, stereotypes should be cooled immediately, otherwise it will be deformed under the action of gravity. Typically by cooling with water cooling, and depending on the water temperature, divided quenching and slow cooling. Cold water quench is direct cooling, quenching of extruded plastic cladding stereotypes favorable, but in terms of the crystalline polymers, due to sudden thermal cooling, easy to squeeze inside the internal stress of residual cladding tissue, leading to cracks during use, generally PVC plastic layer using quench. Slow cooling is to reduce stress products, placing different segments of the water temperature in the cooling tank, the article gradually cooling stereotypes, for PE, PP extrusion on the use of slow cooling, namely through the hot water, warm water, cold water Cooler.