In the production process of rubber products, the process where a roller or extruder is used to pre-make various shapes and different sizes is called molding. The molding methods include:
It is a method of pressing the rubber compounds into a film of a certain shape and a certain size through a roller. Some rubber products, such as tires, rubber cloth, hoses and other textile fiber materials must be coated with a thin layer of glue. The gluing process is generally completed on the roller. The fiber material needs to be dried and dipped before rolling. The purpose of drying is to reduce the water content of the fiber material, so as to prevent the water from evaporating and foaming and increase the temperature of the fiber material to ensure the quality of the rolling process. Glue dipping is a necessary process before gluing, and the purpose of it is to improve the bonding performance of fiber materials and rubber materials.
It is a method in which a rubber compound with a certain degree of plasticity is put into the hopper of an extruder and passed through various mouth shapes under the extrusion of a screw. This method is also called a model of continuous molding. Before extruding, the rubber must be preheated to make the rubber soft and easy to extrude, so as to obtain rubber products with smooth surface and accurate size.
It is also practical to use the molding method to manufacture certain rubber products with complex shapes, such as cups and sealing rings. This method places the rubber material in the mold for heating with the help of the formed paired molds.