Extruded rubber products differ from molded rubber products based on how they’re made. Extruded parts are forced through a die of the required cross section under pressure of an extruder. These parts are often made with soft, unvulcanized rubber compounds that are fed into the extruder. The resulting extrusion leaves the rubber in a soft, pliable state. In this case, the finished extruded products will typically need to be vulcanized, or hardened, before they are rendered usable.
Extrusion Die for Extruded Rubber
An extrusion die is a precise and specific tool made by cutting an opening through a blank of steel. The shape of the opening will match the finished rubber cross section desired for an extruded part. Once in place, the rubber material will be forced through this die via the pressure that builds up from the revolving screw of the extruder.
Many rubber compounds tend to swell when passing through the extrusion die, causing them to experience an increase in dimensions. Thus, each die is made according to each particular part and material to ensure that all tolerances are met for the finished extruded rubber part.
There are many advantages to the rubber extrusion process, including:
Variety of shapes available
Efficient and economical
Flexible and lightweight products
Extruded Rubber Products
Kennwu can also cut custom rubber extrusions in a range of lengths, shapes, and rubber compounds to meet various temperature, weather, and technical specifications. Some of them, such as EPDM or Neoprene, can be extruded like dense rubber or sponge rubber. Common extruded rubber products include:
Mandrel formed hoses
Door, cabinet and window seals
Window seals for mass transit
Pressure switch square tubing