Composition structure:

Host plastic pelletizing equipment is an extruder, which consists of extrusion system, transmission system and the heating and cooling system.

Plastic extrusion granulation equipment systems:

Extrusion system includes a screw, barrel, hopper, head, and die, by extrusion system and plasticized plastic into a uniform melt, and in the process established under pressure, by continuous extrusion screw head.

(1) Screw: is the most important part of the extruder, it is directly related to the range of applications and productivity of the extruder, from high-strength corrosion resistant alloy steel.

(2) Barrel: a metal cylinder, usually with heat-resistant, high compressive strength, extremely resistant, corrosion-resistant alloy steel or alloy steel lined composite steel pipe. Barrel and screw together to achieve plastic crushing, softening, melting, plastics, exhaust and compaction, and to forming a continuous uniform delivery system sizing. Its barrel length is generally 15 to 30 times the diameter, so that the plastic is fully heated and fully plasticized principle.

(3) Hopper: cut off the bottom of the hopper is equipped with means to adjust and cut off the stream, depending on the side of the hopper is equipped with holes and calibrated measuring device. (4) the nose and die: the head by steel and carbon steel inner sleeve jacket structure, built with mold nose. The role of head of the rotary motion of the plastic melt into a parallel linear motion, uniform steady import die sets in, and given the necessary plastic molding pressure. Plastic barrel plastics compaction, neck and head through the porous filter plate mold flow into the nose along a certain runner through the core die sets appropriate with the formation of the annular space section constantly decreasing, the plastic melts forming a continuous dense tubular cladding layer surrounding the core wire. To ensure the plastic flow path within a reasonable head, eliminating the accumulation of plastic corners, often shunt placement sleeve, pressure fluctuations for the elimination of plastic extrusion, also set up the equalizing ring. Machine head is also equipped with mold correction and adjustment device, easy to adjust and correct punch and die sets concentricity.

Transmission:

Transmission is the role of the drive screw, feed screws in the extrusion process the required torque and speed, generally consists of motor, reducer and the bearings and other components.

Heating and cooling means:

Heating and cooling is a necessary condition for a plastic extrusion process can be carried out.

(1) now extruder usually is electric heating, resistance heating and induction heating divided, the heating plate mounted on the body, neck machine, each part of the handpiece. Heated by an external heating means of the plastic tube, so as to heat up, temperature of the process in order to achieve the desired operation.

(2) cooling means is in the process of plastic in order to ensure the required temperature range settings. Specifically, in order to remove excess heat generated by friction shear screw rotation to avoid overheating the plastic decomposition, scorch or stereotypes difficulties. Cylinder water-cooled and air-cooled cooling is divided into two kinds, most small and medium extruder using air more appropriate, a large multi-use water or the combination of two types of cooling; water-cooled screw cooling centers mainly aimed at increasing the rate of transport of solid materials stable volume of the plastic, while improving product quality; but in the cooling hopper, one 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 normal operation of the transmission part.

Auxiliary equipment:

Plastic granulator auxiliary equipment including actinomycetes device, straightening device, preheat device, cooling equipment, traction devices, meter, spark tester, closing line unit. Different uses of its extrusion unit with optional auxiliary equipment are not the same. As well as cutting, drying devices, printing devices.