The production process of plastic spools.
The production of plastic spools.
2021-08-30
Plastic spoolIt is also very common in industry, let me introduce it today.
1. Working principle of the extruder
Using a screw of a specific shape, it rotates in a heated barrel, extruding the plastic fed from the hopper forward, allowing the plastic to be uniformly plasticized (i.e., melted), and through the die head and different shaped molds, the plastic is extruded into various continuous shapes of materials as needed.
Three stages of plastic during the extrusion process:
(1) Plasticization stage: also known as the compression stage. This is completed inside the barrel. Through the rotation of the screw, the plastic changes from solid granules to a plastic viscous fluid.
(2) Molding stage: occurs in the die head. The rotation of the screw and the pressure push the viscous fluid towards the die head, where it passes through the mold inside the die head, forming the viscous fluid into various sizes and shapes of extruded materials. The mold in the die head serves a forming function, not a shaping function.
(3) Shaping stage: occurs in the cooling water tank. After cooling, the plastic changes from a plastic state to a shaped solid state.
2. Flow states of plastic during the extrusion process:
(1) Forward flow - flows forward along a spiral line. Forward flow is generated by the pushing force of the rotating screw, and it affects the extrusion amount.
(2) Backflow - opposite to forward flow. It is generated by the reaction force of the die head, mold, and filter screen.
(3) Transverse flow - also known as circulation. It flows forward along the axial direction, perpendicular to the screw thread. It is also generated by the pushing force of the rotating screw. The reason plastic can mix and plasticize into a molten state in the screw is inseparable from the effect of circulation.
(4) Leakage flow - it is also generated by the resistance of the die head, mold, and filter screen. It does not flow in the drop tank but flows in the gap between the screw and the barrel. Usually much smaller than forward and backflow. Leakage flow affects the extrusion amount.
Plastic spoolThis is the working principle and part of the process of the extruder, welcome everyone to come and purchase.
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ZhenHua Packing Machinery
Tel: 086-769-85707005
Mobile: 086 132 6843 4928
Email: wangyumei630@163.com
Address: Building 3, Wanshan Factory, No. 38 Hulin Road, Humen Town, Dongguan City
ZhenHua Packing Machinery
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