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Extrusion Molding Principle of Rubber Extruders

Time：

2018-05-17

Rubber extruders are classified according to their feeding method into cold-feed rubber extruders and hot-feed rubber extruders. Based on the level of pressure, they can be further divided into rubber tube extruders and vented rubber extruders (used for producing rubber sealing strips). Rubber tubes, in turn, are categorized into standard rubber tube extruders and pin‑type rubber tube extruders. Whether it is a rubber tube extruder or a rubber sealing strip extruder, both are collectively referred to as rubber extruders. Both rubber tubes and rubber strips are produced using rubber extruders. So, what are the principles and characteristics of extrusion molding with rubber extruders? Let’s take a look. 1. Principle of rubber extrusion molding: The rubber compound is heated within the extruder.

Rubber extruders are classified, according to their feeding method, into cold-feed rubber extruders and hot-feed rubber extruders.

Rubber extruders can be classified according to their pressure levels into rubber hose extruders and vented rubber extruders (used for producing rubber sealing strips). In turn, rubber hoses are further divided into standard rubber hose extruders and pin‑type rubber hose extruders.

Whether it’s a rubber hose extruder or a rubber sealing strip extruder, both are collectively referred to as rubber extruders. Rubber hoses and strips are both produced using rubber extruders. So, what are the principles and characteristics of the extrusion‑forming process in rubber extruders? Let’s take a look.

I. Principle of Rubber Extrusion Molding: The rubber compound is heated and plasticized within the extruder, subjected to intense shear between the screw and the barrel, and continuously conveyed forward by the screw’s rotation. Under a specified pressure, it is then extruded through an extrusion die (also known as a die head) to produce the desired product shape.

II. Characteristics of Rubber Extrusion Molding:

1. The rubber compound undergoes further mixing and plasticization as it is conveyed by the extruder screw, resulting in a semi-finished rubber product with a dense, uniform structure.

2. It has a wide range of applications; by changing the die, it can extrude rubber profiles of various cross-sectional shapes as well as pre‑formed semi‑finished products for use in compression molding dies.

3. Extrusion‑molded products are produced rapidly, with high manufacturing efficiency, making them well suited for automated production.

4. Extrusion molding is not limited by length, enabling the production of long articles that cannot be manufactured by compression molding due to equipment constraints.

That concludes the principles and characteristics of extrusion molding in rubber extruders. You can now gain a basic understanding.

Hebei Shuangda Rubber & Plastics Machinery Co., Ltd. is a manufacturer of complete sets of extrusion equipment for rubber, silicone, and plastics. Its main products include rubber extruders, pin‑type rubber hose production lines, three‑layer composite sealing strip production lines, silicone vulcanization lines, and plastic sealing strip production lines, among others. We warmly welcome customers to visit our facility for guidance and collaboration, working together to achieve mutual success!