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The relationship between silicone products and silicone extruders

Time：

2019-08-22

1. Introduction to silicone extruders: The screws of silicone extruders are made of steel. They are hollow, allowing water to flow through for cooling, and their pitch is typically adjustable. Their diameters range from 2 to 10 inches. Temperature control is critical, especially at the die head, where automatic regulation is employed. 2. Introduction to the extrusion process for silicone products: Extrusion is a highly effective and practical method for processing silicone rubber, enabling the production of molded rods, tubes, strips, gaskets, and other standard shapes in various sizes. Silicone is first warmed on an open mill, after which it is fed directly into the extruder via a continuous feed system. An extruder essentially consists of a cylindrical barrel or cylinder within which a screw rotates.

1. Introduction to the silicone extruder:

The screws of silicone extruders are made of steel. They are hollow, allowing water to flow through for cooling, and their pitch is typically adjustable. Their diameters range from 2 to 10 inches. Temperature control is critical, particularly at the die head, and should be automated.

2. Introduction to the extrusion process for silicone products:

Extrusion is a highly useful and practical method for processing silicone rubber products, employed to manufacture a wide range of standard and custom‑shaped rods, tubes, strips, gaskets, and other components via mold‑pressing.

The silicone rubber is first warmed on an open mill, after which it is fed directly into an extruder via a continuous feed line. The extruder essentially consists of a cylindrical barrel or cylinder within which a screw rotates. The silicone rubber strip introduced into the extruder is gripped by the screw’s threads and conveyed toward the end of the cylinder, where it emerges through a die or nozzle shaped to the desired cross‑section. The rubber compound, subjected to heat and negative pressure during processing, assumes a continuous profile. Clearly, a wide variety of products can be manufactured by extrusion—for example, tire treads, for which the extruder produces flat strips. These strips are cut to the appropriate length and assembled, along with other components such as cord plies, fabric layers, and bead wires, onto the drum of a tire‑building machine.

When producing hollow products, such as silicone rubber hoses, the extruder die is equipped with a core positioned at the center of its circular orifice or mold. To prevent the hose from collapsing after exiting the extruder and to ensure that the hose remains adhered to the core, the core itself is hollow and extends into the interior of the hose via an extension through its opening.

The degree of swell experienced by a rubber compound during extrusion depends on the material’s viscosity, the applied pressure and extrusion rate, the temperature, and other factors; accordingly, die geometry and profile, as well as operating conditions, must be carefully controlled to produce a product with the desired shape and dimensions.

Therefore, a silicone extruder is an essential and indispensable component of the silicone‑product extrusion process. Many practical, everyday silicone items that we encounter in all aspects of life are produced using an extruder; thus, the silicone extruder is a critical part of silicone‑product manufacturing.

Hebei Shuangda Rubber & Plastics Machinery Co., Ltd. is a modern enterprise integrating 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.