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Things you need to know about the Rubber Extrusion Process

Rubber materials have been used by many industries since the 19th century. Since then, different rubber processing methods have emerged but one that remains a preferred choice amongst manufacturers is rubber extrusion.

What does the Rubber Extrusion Process Entail?

Rubber extrusion is the process of turning rubber materials into a specifically shaped product that can be used for various applications.

How does it Happen?

A rubber extruder machine has two main parts; a heated shearing screw conveyor and a die in which the pressurised rubber is squeezed, providing its shape.

During the process, the stock rubber (raw) is processed through the screw. As it turns, the screw pushes the stock while it is heated in the conveyor channel.

From the hopper (container above the conveyor), the stock is sent to the conveyor where it is softened through heating and shearing and pressurised by the screw’s rotation process. The pressurised stock is pushed into the die (located at the end of the extruder) and as it emerges it acquires its shape.

What are the advantages of Rubber Extrusion and Rubber Extruded Products?

  • A continuous extrusion process can produce finished products in different lengths
  • Raw materials can be formed into unique profiles with a variety of lengths and shapes
  • Extruded rubber products or “extrudates” have flexible characteristics and are highly resistant to chemicals and heat

What are the Common Profiles of Rubber Extruded Products?

Rubber extruded profiles may vary depending on the application. They are commonly applied to industrial applications that require sealing.

Although many other profiles can be made, there are also profiles that are readily available on the market.

Door Seal Profiles

Also known as extruded top and side seals, these profiles are designed to fill the gaps between doors and door frames to prevent wind and water from entering a vehicle or building.

Door seals are typically rectangular. They are used in cars and trucks, as well as in many commercial and industrial facilities. Door seals such as hatch seals can also be found in fuel tanks, rooftop HVAC systems and in electronic enclosures.

PVC Edge Trim Profiles

PVC edge trim profiles are used to cover rough edges made from plastics and steels. These types of rubber extruded profiles are made from flexible PVC and have gripping tongues that allow them to provide a much stronger hold.

PVC edge trim profiles are usually found in automotive and marine industries and are used for applications such as decorative trims for boats, cars and buildings.

Boot Seal Profiles

Boot seals are used as a coating for the sharp metal edges of the boot of a car/vehicle. Preventing dust and water from entering the vehicle, they also prevent noise and vibration when travelling.

Whether by extrusion or any other rubber processing methods, there is no denying that rubber is an excellent material for many everyday applications.



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