News

Trade news

Company news

FAQ

What are the individual steps in the extrusion process for rubber sealing strips?

Time：

2019-12-30

1. The internal mixing process involves blending carbon black, natural and synthetic rubbers, oils, additives, accelerators, and other raw materials in an internal mixer to produce a compound. Before entering the mixer, all raw materials must undergo testing and are only used after being approved. Each batch in the internal mixer typically weighs about 250 kilograms. The compound used for each rubber component in a tire is tailored to specific performance requirements. The composition of the compound depends on the desired performance characteristics of the tire, as well as on the specifications of the supporting manufacturers and market demands—primarily driven by traction, handling, and road‑surface conditions.

1. Internal Mixing

The internal mixing process involves blending carbon black, natural and synthetic rubbers, oils, additives, accelerators, and other raw materials in an internal mixer to produce a compound. Before entering the mixer, all raw materials must undergo testing and are only used once they have been approved. Each batch in the internal mixer weighs approximately 250 kilograms. The compound used for each rubber component in a tire is tailored to specific performance requirements. The formulation of the compound depends on the intended performance characteristics of the tire, as well as on the specifications of the original equipment manufacturer and market demands—factors driven primarily by traction, handling, road conditions, and the tire’s own functional requirements. Prior to moving to the next stage—the rubber component preparation process—all compounds are subjected to testing and are only transferred to the subsequent step after receiving clearance.

2. Extrusion

The rubber compound is fed into the extruder head, enabling the extrusion of various semi-finished rubber components: the tread, the sidewall/bead, and the triangular strip.

3. Stone Transformation

After passing through the extruder die, the rubber compound takes on a specific shape and then enters the calendering box for calendaring, where the product is shaped and set.

4. Cooling

After the product is formed into a specific shape in the stone‑hardening box, it is cooled in a water tank and then directly wound onto a reel.

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.