Rubber Expansion Joint Manufacturing
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. Because of the labor intensive production process large part of the production has moved to eastern Europe and Asian countries.
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. These rubber expansion joints are manufactured on a cylindrical mandrel, which is wrapped with bias cut fabric ply. At the end the bead rings are positioned and the end sections are folded inwards over the bead rings. 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
Lately new technology has been developed to wind rubber and reinforcement layers on the (cylindrical or bellow shaped) mandrel in an automated fashion using industrial robots instead of manual wrapping. 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. 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.
Read more about this topic: Expansion Joint
Famous quotes containing the words rubber, expansion and/or joint:
“The idea that information can be stored in a changing world without an overwhelming depreciation of its value is false. It is scarcely less false than the more plausible claim that after a war we may take our existing weapons, fill their barrels with cylinder oil, and coat their outsides with sprayed rubber film, and let them statically await the next emergency.”
—Norbert Wiener (1894–1964)
“Every expansion of government in business means that government in order to protect itself from the political consequences of its errors and wrongs is driven irresistibly without peace to greater and greater control of the nation’s press and platform. Free speech does not live many hours after free industry and free commerce die.”
—Herbert Hoover (1874–1964)
“Your letter of excuses has arrived. I receive the letter but do not admit the excuses except in courtesy, as when a man treads on your toes and begs your pardon—the pardon is granted, but the joint aches, especially if there is a corn upon it.”
—George Gordon Noel Byron (1788–1824)