Extrusion system, including screw, barrel, hopper, the nose, and mold, plastic plastic into homogeneous melt by extrusion system, and established in the process, under pressure by screw continuous extrusion head.
Screw: is the main component of the squeeze molding machine, it is directly related to the extrusion molding machine and the application scope of productivity, is made from high strength and corrosion resistance of alloy steel.
Barrel: a metal cylinder, generally with heat resistant, high crushing strength, strong wear resistance, corrosion resistance of alloy steel or lining made of alloy steel composite pipe.
Barrel and screw, implementation of plastic crushing, softening and melting and plasticizing, exhaust and compaction, and to the continuous uniform conveying rubber molding system, general barrel length to diameter of 15 ~ 30 times, in order to make plastic fully heated plastic extrusion machine and wire points into a principle.
At the bottom of the hopper, hopper is equipped with cutting device, in order to adjust and stop the flow of material, the side of the hopper is equipped with sight hole measuring device and calibration.
Head and mould: the nose consists of alloy steel inner sleeve and carbon steel jacket, in a forming die head, is the role of head rotation movement of the plastic melt into a parallel straight line, import die set is steady, and give necessary to plastic molding pressure, plastic plasticizing compaction in the barrel, is approved by the flow of porous filter plate along a certain head neck into the head forming die, die core die set appropriate coordination, the formation of cross section and decreases the annular space, make the plastic melt around the conductor to form a continuous solid tubular cladding layer.
In order to ensure the nose in plastic flow is reasonable, eliminate accumulated plastic corner, placed tend to have a split sleeve, to eliminate the plastics extrusion pressure fluctuations, also has a set of equalizing ring.
The nose is also equipped with mold correction and adjustment device, easy adjustment and correction of mold core and mold set of concentricity.