Why is the extruder

Extruder, the host is extruder, by extrusion system, transmission system, heating and cooling system. The extruder can be divided into continuous extrusion and discontinuous extrusion by the function type. Plastic extruder is also a kind of plastic machinery. Extruder head in accordance with the material flow direction and the screw stem center line angle, will head into oblique head (angle 120o) and right angle handpiece. Head of the shell is used bolt fixed on the fuselage, the die head has sat on the core, and the nut is fixed in the nose inlet port, mold core seat is mounted in front of the mold core, the center of the mold core and the mold core seat is provided with a hole for the wire. Machine introduction & nbsp; & nbsp; & nbsp; plastic extrusion machine extrusion machine, it by extrusion system, transmission system, heating and cooling system.
Double screw extruder
1. The extrusion system extrusion system includes a screw, barrel, hopper, die, and die, plastic through extrusion system and plasticizing into homogeneous melt, and in the process the established pressure, screw continuous extrusion dies. (1) screw extruder is the main component, it is directly related to the scope of application of the extruder and the productivity, made of high strength resistant corrosion of alloy steel made. (2) the barrel: a metal cylinder, generally made of composite steel tubes with heat resistance, high compressive strength, strong wear resistance, corrosion resistant alloy steel or lined steel. The machine barrel and screw cooperate with the machine, realize the crushing, softening, melting, melting, the air and the compaction of the plastic, and feeding the plastic material continuously to the molding system.. The length of the general machine is 15 ~ 30 times of its diameter, so that the plastic can be fully heated and fully plastic for the principle. (3) the hopper: the bottom of the hopper is equipped with a truncation device for adjusting and cutting material flow, and the side of the hopper is equipped with the hole and the calibration metering device. (4) die and die: die made of alloy steel and carbon steel inner sleeve is arranged in the outer sleeve, die mold. The function of the nose is to change the plastic melt into parallel motion, uniform and stable introduction of the plastic melt, and give the plastic the necessary molding pressure.. Plastics in the barrel plasticizing compaction and through the porous filter plate along the passage through the head neck into the die mold, die sets of core with appropriate to form a cross section decreases in the annular space, plastic melt in around the wire core formed tubular continuous dense coating layer. In order to guarantee the reasonable die, plastic flow, eliminate accumulation of plastic corner, often mounted on a split sleeve, for the elimination of plastic extrusion pressure fluctuation, also has a set of grading ring. The head is also provided with a device for mould correction and adjustment, convenient adjustment and correction of the mold core and the mold sleeve concentricity.
Extruder according to the head of material flow direction and the screw stem center line angle, will head into oblique head (angle 120o) and right angle handpiece. Head of the shell is bolted on the fuselage, the die head is sitting in a core and nut fixed in the nose inlet port, mold core seat is mounted in front of the mold core, the center of the mold core and the mold core seat is provided with a hole for the wire; in the front of the head with equalizing ring, for balanced pressure; extruded forming part of the die sleeve and die set, wherein, the die sleeve position can be by bolts through the support to adjust, to the relative position of the adjustment model of the core, easy regulation of extruded layer thickness uniformity. The head is equipped with a heating device and a temperature measuring device. 2 the drive system is the driving screw, supply screw in the extrusion process of the torque and speed, usually by the motor, reducer and bearing and so on. 3 the heating and cooling of the heating cooling device is the essential condition of the plastic extrusion process. (1) now extruder usually is electric heating, divided into resistance heating and induction heating, heating pieces in various parts of the body, neck and head. The heating device is made of plastic in an external heating tube, so that the temperature of the process operation is reached. (2) the cooling device is provided in order to ensure that the plastic is in the temperature range of the process requirements.. Specifically, in order to exclude the friction of the screw rotation generated excess heat, in order to avoid the temperature is too high make plastic decomposition, coke burn or stereotypes difficult. Cylinder cooling water cooling and air cooling two, generally small extrusion machine adopts air cooling more appropriate, large, multi use water or two forms combined with cooling; cooling screw mainly adopts water cooling to increase the material solid conveying ratio, the quantity of cement stable, at the same time improve the high quality of the products; but in the cooling of the hopper, one is to strengthen the role of solid conveying, prevent due to the temperature causes the plastic grain sticky jam feeding port, and the second is to ensure the normal work of the transmission part.