News

Trade news

Company news

FAQ

A rubber extruder manufacturer will explain the development of rubber extruders and their temperature-control components.

Time：

2022-08-01

As a fundamental piece of equipment in the rubber industry, the rubber extruder is one of the key machines that significantly influence product quality and plays a crucial role in the production of tires and rubber goods. Overseas development of rubber extruders has progressed through several stages, including plunger-type extruders, screw‑type hot‑feed extruders, conventional cold‑feed extruders, twin‑screw cold‑feed extruders, vented cold‑feed extruders, pin‑type cold‑feed extruders, and composite extruders. Rubber extruders are used for shaping, filtering, and coating rubber semi‑finished products. Notably, their screws and inner sleeves are manufactured from nitrided steel, providing excellent wear resistance and corrosion resistance.

Rubber extruder The manufacturer will explain the development of rubber extruders and their temperature-control components.

As a fundamental piece of equipment in the rubber industry, the rubber extruder is one of the key machines that significantly influence product quality and plays a crucial role in the production of tires and rubber goods. Overseas development of rubber extruders has progressed through several stages, including plunger-type extruders, screw‑type hot‑feed extruders, conventional cold‑feed extruders, twin‑screw cold‑feed extruders, vented cold‑feed extruders, pin‑type cold‑feed extruders, and composite extruders. Rubber extruders are used for shaping, filtering, and coating rubber semi‑finished products. Notably, their screws and inner sleeves are manufactured from nitrided steel, offering excellent wear resistance and corrosion resistance.

Screw extrusion of rubber compounds is one of the oldest areas of extrusion technology, dating back to the 19th century. Rubber extruders differ markedly from thermoplastic extruders: first, rubber extrusion is carried out at relatively low temperatures—typically below 130°C; second, rubber extruders often feed rubber strips rather than pellets (pellets are used only in exceptional cases). In screw‑extrusion systems, rubber strips undergo little phase transformation or thickening. By contrast, thermoplastic rubbers are processed in screw extruders at temperatures ranging from 180°C to 300°C or higher, and low‑density solid particles are frequently introduced into the extruder; as these particles advance along the screw, the melt pool becomes progressively compacted.

Rubber extrusion machine They are typically classified as hot-feed and cold-feed extruders. In a hot-feed extruder, the rubber compound is heated by the mechanical action of the mixer; the heated rubber strands are then cut and continuously fed into the extruder. In a cold-feed screw extruder, rubber strands at ambient temperature are fed directly into the extruder.

Rubber Extruder Manufacturer: Temperature Control Components for Rubber Extruders

Extrusion plays a crucial role in rubber production; rubber extrusion is carried out by… Rubber extruder This is achieved by raising the temperature of the screw barrel to the required level before production and prior to starting operation. The temperature of the rubber extruder is controlled by a mold‑temperature controller or a mold‑temperature control unit, with each unit managing a specific temperature zone. Water serves as the heat‑transfer medium; during the design of the screw barrel, water channels are incorporated, and the heated water from the mold‑temperature controller circulates through these channels to transfer heat to the rubber extruder.

After startup, the rubber is fed into the screw barrel via the feeding system. It undergoes a series of processes—including shearing, mixing, and compression—by the screw, and is then extruded through the die to form the desired shape. Following extrusion, the product is vulcanized in a hot-air curing chamber to produce the finished article.

In rubber production, the extruder continuously processes the rubber, generating heat and causing the temperature to rise. However, if the temperature becomes too high, it can adversely affect product molding or even block the feed port of the screw barrel. Therefore, it is essential to maintain the rubber’s processing temperature within a specified range. When the temperature reaches the setpoint, the equipment must be cooled; at this point, the mold‑temperature controller automatically discharges hot water and injects cold water into the screw barrel, thereby achieving precise temperature control.

Alright, thank you all for watching—see you next time!