The designation "50mm12D" refers to two essential dimensions of the extruder: a 50mm screw diameter and a length-to-diameter ratio (L/D) of 12:1. These specifications indicate that the machine uses a single rotating screw that is 12 times as long as its diameter, which is typical for general-purpose rubber processing where material homogeneity and moderate throughput are required.

This type of 50mm12D Rubber Extrude Machine is commonly used in industries such as automotive, construction, and consumer goods, where rubber profiles like seals, tubing, insulation strips, and gaskets are manufactured. The machine is designed to process a wide range of rubber compounds, including natural rubber, EPDM, NBR, SBR, and silicone rubber.

The core component of the extruder is its screw. In a 50mm12D machine, the screw is relatively short compared to those used in plastic extrusion, which often have L/D ratios of 20:1 or higher. This shorter design is suitable for rubber, which is more viscous and requires intensive shearing and mixing rather than long melting paths.

The screw may include several zones:

Feed zone, where material is introduced;

Compression zone, where the rubber is compacted and plasticized through heat and pressure;

Metering zone, where the rubber is homogenized and pushed consistently toward the die.

Depending on the rubber compound and processing goals, screw designs can vary in pitch, flight depth, and compression ratio to optimize output and reduce thermal degradation.

The extruder barrel is usually made from hardened steel with a wear-resistant lining. Temperature control along the barrel is crucial in rubber extrusion. Unlike thermoplastics, rubber does not melt but becomes plasticized. Excessive heat can lead to premature vulcanization or degradation.

The 50mm12D machine is equipped with multiple heating zones, typically managed through electric heating elements and cooling systems (such as air or water). This zoning allows for precise thermal management, ensuring the rubber reaches a consistent processing temperature without scorching.

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Product name, specification model and equipment weight size:
Product Name: Cold Feed Extruder
Specification model: XJWP-120X20D
Equipment weight: about 5 tons
Dimensions (length X width X height): about 4200X1200X1600mm
Equipment layout: