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What are the features of a plastic rigid strip extrusion production line?

Time：

2020-04-04

Characteristics of extrusion molding: (1) Wide range of applications: Most thermoplastics and some thermosets can be processed by extrusion. It is suitable for producing pipes, sheets, rods, films, cables, and profiles with various cross-sectional shapes. In plastic part manufacturing, extrusion accounts for more than half of all forming processes. (2) Continuous production process: Parts of any desired length can be produced as needed. (3) High production efficiency: Extruders can continuously and uniformly extrude material. 2. Working principle, components, and operating process of an extruder: Plastic enters the extruder through the hopper and is conveyed forward by the rotation of the screw. As it moves forward, it is subjected to heating from the barrel,

Characteristics of extrusion molding:

(1) Wide range of applications: Most thermoplastics and some thermosets can be processed by extrusion. It is suitable for producing pipes, sheets, rods, films, cables, and profiles with complex cross‑sections. In the molding and processing of plastic parts, extrusion accounts for more than half of all processes.

(2) Continuous production process: Components of any length can be produced as required.

(3) High production efficiency: The extruder can extrude continuously and uniformly.

2. Working Principle and Components of an Extruder

Process: Plastic enters the extruder from the hopper and is conveyed forward by the rotation of the screw. As it moves, it is heated by the barrel and subjected to shear and compression from the screw, causing it to melt and transition from the glassy state to the viscous flow state. The molten plastic then passes through the die, forming a continuous strand whose cross-section matches the die’s shape, before being cooled and solidified into the glassy state, yielding the desired part.

(1) Host

Extrusion system: Primarily composed of a screw and a barrel, it is the key component of an extruder.

Transmission system: The screw’s drive mechanism, comprising gears of varying sizes, a transmission shaft, and an electric motor.

Heating and cooling system: Heats and cools the barrel and screw to ensure that the molding process remains within the specified process parameters.

(2) Auxiliary Equipment

Die head (die): The molding component that shapes the part, through which the molten plastic acquires its form and dimensions.

Shaping device: ensures that the plastic extruded from the die maintains a stable, predetermined shape.

Cooling unit: Cools the molded plastic to obtain the finished product.

Drawing device: uniformly draws the workpiece and controls its cross-sectional dimensions.

Cutting device: Cuts the continuously extruded workpiece into specified lengths and widths.

(3) Control System. It controls the unit’s motor, hydraulic system, and other actuators to ensure that their speed and power meet process requirements. It also monitors and regulates the temperature, pressure, flow rate of both main and auxiliary equipment, as well as the quality of the manufactured parts, thereby achieving automated control of the entire unit.

Hebei Shuangda Rubber and Plastics Machinery Co., Ltd. is a modern enterprise that integrates research and development, manufacturing, and sales of complete sets of extrusion equipment for rubber, silicone, and plastics. The company’s main products include rubber extruders, rubber hose extrusion lines, three‑layer composite sealing strip extrusion lines, silicone sealing strip production lines, plastic sealing strip production lines, plastic profile production lines, plastic pipe production lines, elastomer extruders, and other extrusion equipment, as well as production machinery for engineering seals, automotive seals, wire and cable applications, air‑conditioning hoses, braided hoses, automotive hoses, waterstop strips, and related products.