Rubber extrusion

Extruded rubber products are highly different from molded rubber products at the part of their manufacturing and structure. In extruded rubber the uncured rubber is forcefully passed through a die of desired cross-section by applying pressure. The product got after the step is then cured or vulcanized in an autoclave which is a heated vessel. The temperature of the vessel is set to a specific amount for desired results. Extruded parts can be made in a variety of sizes.

Extruded rubber products are used in a wide range of products. The strength of products strictly depends on the strength of the rubber sheets as the product is made of it. The products from the extruded rubber are made by forcing un-vulcanized tubing over the flexible core that is bent to the required shape. The thickness can be handled by stretching on the outside of the bend and compressing inside of the bend.

Many rubber compounds tend to swell after passing through the extrusion die causing them to experience an increase in dimensions. Therefore, each die is made accordingly for each specific part to ensure meeting tolerance capacity for the finished product. If a minimum wall thickness is specified, it will mean this minimum thickness must be furnished at the outside bend or stretched section, and depending on the severity of the bend or bends, it will require an oversize wall thickness on the rest of the tubing from 0.40mm – 0.80mm to ensure the minimum thickness on the stretched area. If tubing is specified, it must be understood that, depending on the severity of the bend or bends, wall thickness will be from 0.40mm – 0.80mm undersize in the stretched areas. This needs the extruded rubber to be of higher quality as this is what forms the base of the product being manufactured from extruded rubber.