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Rubber expansion joint manufacturing process

 Wrapping fabric reinforced rubber sheets

Rubber expansion joint are mainly manufactured by manual wrapping of rubber sheets and fabric reinforced rubber sheets around a bellow shaped product mandrel. Besides rubber and fabric reinforced rubber sometimes also steel wires or metal rings are added for additional reinforcement. After the entire product is build up on the mandrel it is covered with a winding of (nylon) peel ply to pressurize all layers together before pressurization.

Molded rubber expansion joints

Some types of rubber expansion joints are made with a molding process. Typical joints that are molded are medium sized expansion joints with bead rings which are produced in large quantities. This part is finally placed in a mold and molded into shape and vulcanized. This is a highly automated solution for large quantities of the same type of joint.

Automated winding of rubber expansion joints

The fabric reinforcement is pre-woven and cut at the preferred bias angle. With individual reinforcement it is possible to add more or less fiber material at different sections of the product by changing the fiber angles over the length of the product.The automated production with a robot is fast and accurate which provides a repeatable high quality. Another aspect of using industrial robots for the production of rubber expansion joints is the possibility to apply an individual reinforcement layer instead of using pre-woven fabric.