Rubber molding and rubber extrusion are two reliable manufacturing methods for rubber parts and components. Both methods are very popular in the rubber industry, but there are key differences between them.
Rubber Molding
Rubber molding refers to any rubber manufacturing process in which uncured rubber is placed inside a cavity or shape and then cured. Rubber molding is compatible with a wide range of both natural and synthetic polymers.
Types of Rubber Molding
There are three primary types of rubber molding.
Rubber Injection Molding
Rubber injection molding is one of the most popular types of rubber molding. The uncured rubber material is heated to a liquid consistency, so it can flow into the mold cavity. Once the cavity is filled, the molded rubber part is cured.
Rubber Compression Molding
Unlike rubber injection molding, the rubber compression molding process begins with preformed, uncured rubber, rather than liquid rubber. The uncured, preformed rubber is placed inside an open mold. Tremendous pressure and heat are applied when the mold is closed, forcing the rubber material into the desired shape.
Rubber Transfer Molding
Rubber transfer molding combines the principles of injection and compression molding. A uncured rubber preform is placed inside a chamber above the mold itself, which is heated. A plunger applies pressure to the rubber, driving rubber material through channels called sprues and into the mold. The molded rubber part is then cured.
Advantages of Rubber Molding
Rubber molding is an excellent manufacturing option for complex, three-dimensional rubber molded shapes with tight tolerances. The process is highly customizable, allowing for tremendous design flexibility. Additionally, rubber molding is very efficient, allowing manufacturers to produce the same shape over and over with very little material waste. The process is well suited for automation.
Applications of Rubber Molding
The applications of rubber molding are countless. Rubber molding is an excellent option for simple parts, such as seals, o-rings, and gaskets, as well as complex components, such as single-use medical devices. Common examples of rubber molded parts include bumpers, bushings, mounts, pads, and grommets.
Rubber Extrusion
Rubber extrusion refers to the process of forcing rubber through a die to create components with a specific cross-sectional profile. Unlike rubber molding, which creates one component at a time, the extrusion process is continuous, and individual components are created when the extruded material is cut.
Advantages of Rubber Extrusion
Rubber extrusion is a highly efficient process that produces very little waste. Because cut lengths are entirely customizable, rubber extrusion manufacturers can create a wide range of finished products from a single extrusion line, such as different lengths of tubing or trim.
Applications of Rubber Extrusion
Rubber extrusion is an excellent method for manufacturing tubing, hoses, edge trim, and many different shapes of seal for doors and windows. Rubber extrusion manufacturers can also make gaskets, bushings, seals, and o-rings.
Universal Polymer & Rubber Capabilities
Universal Polymer and Rubber is proud to offer highly customizable rubber molding and rubber extrusion services for a wide range of products, industries, and applications. Our rubber molding services include injection, compression, and transfer molding, and our extrusion capabilities can be tailored to meet your exact needs. We do all of our manufacturing on American soil, at our 150,000 square foot manufacturing facility in Middlefield, Ohio.
At Universal Polymer and Rubber, we take a hands-on approach to ensure that our customers receive the best possible service and exceptional products. With our years of rubber manufacturing experience, we can help you choose the right material and manufacturing method for your desired specifications, business goals, and budget.
To learn more about our rubber molding and extruding capabilities or discuss a project, talk to a member of our team >