What are some methods of rubber molding?

In the production process of rubber products, the process of using a calender or extruder to make a variety of shapes and sizes in advance is called molding. Molding methods are:

Calendering is suitable for the manufacture of simple sheet and plate-like products. It is the method of pressing the rubber mixture into a certain shape and a certain size of film through the calender. Some rubber products (such as tires, tape, hose, etc.) used in textile fiber materials, must be coated with a thin layer of glue (glue on the fiber is also called glue or rub), the glue process is generally completed in the calendering machine. Fiber materials need to be dried and dipped before calendering, the purpose of drying is to reduce the water content of fiber materials (so as to avoid water evaporation and foaming) and improve the temperature of fiber materials to ensure the quality of the calendering process. Gluing is a necessary process before hanging glue, the purpose is to improve the binding property of fiber material and glue.

Extrusion molding is used for more complex rubber products, such as tire tread, hose, wire surface coating needs to be manufactured by extrusion molding method. It is to put the mixed rubber with a certain plasticity into the hopper of the extruder, under the extrusion of the screw, through a variety of mouth (also called template) for continuous modeling of a method before pressing out, the rubber material must be preheated, so that the rubber material is soft and easy to extrude, so as to obtain smooth surface, accurate size rubber products.

Die molding can also be used to manufacture some complex shape (such as cup, sealing ring) rubber products, with the help of the formed Yin and Yang mold, the rubber material is placed in the mold to heat molding.