Rubber Molding Companies
Rubber molding is one of many processes by which raw rubber materials are shaped into useful products. The kinds of products that rubber molding processes can create distinguish molding from extrusion, cell casting and all other rubber shaping processes. Because molded products are processed in an enclosed mold cavity as opposed to through a die, molded rubber can be processed into much more complex and irregular shapes.
Rubber molding is the process by which raw rubber is melted and formed in a mold. It is the method of choice in the creation of many different kinds of complex rubber products. For example, rubber seals and rubber diaphragms, which prevent seepage of liquids or gasses, must be precisely designed in order to fit the equipment in which they are installed. The same is true for rubber grommets and rubber washers, both of which must be precisely designed, because they are used to protect equipment. Extrusion can produce seals, diaphragms, grommets and washers, but an extruded seal or grommet’s construction is limited to detail in two axes. This means that an extruder can produce three-dimensional shapes, but it only has design control over the X and Y axes (the rubber product grows in the Z axis as rubber passes through the extrusion die). For this reason, extrusion is more appropriate for the production of simple rubber sheets, rubber baseboards and other long or thin rubber products. Because rubber molding processes use enclosed molding cavities instead of open dies, molding allows for design control over all three axes. Natural rubber as well as synthetic rubbers like neoprene, silicone rubber, liquid silicone rubber, EPDM and foam rubber can all be molded.
Some Leading Manufacturers
Santa Fe Springs, CA | 592-941-4800
RD Rubber Technology Corp is an ISO 9001:2008 certified company. We offer injection, LIM and transfer molding, rubber to metal bonding, engineering support, tooling design and more. Our customers rely on us to give them the best possible production solutions for rubber molding. From aerospace to medical, consumer products to military applications we build trust by being responsive to your needs.
Chaska, MN | 800-852-5384
Lakeview Industries has been manufacturing all kinds of rubber products since 1976. We provide a multitude of rubber molding services, and we manufacture products like tips, caps, stem bushings, suction cups, mats, boots, bellows, and many other custom products. We are your full service rubber molder and extruder, so we can handle all of your rubber manufacturing requirements! Check out our website and give us a call today!
Stuart, FL | 772-286-9278
If you have a need custom rubber molding for products with a fast turnaround, Britech Industries is the company you need to call. We do molded, extruded and die cut rubber – of various products and in the colors and compounds you need. We can manufacture domestically or off shore. If you do not see what you need for your application, let us know, so we can find a solution for you!
Akron, OH | 877-771-6766
With over 30 years of experience in the rubber molding industry, we remain committed to offering the best of our time and energy to all customers no matter how large or small. We believe in providing our customers with the tools they need to succeed. Learn more about what we can do for you on our website today!
Every industry makes use of some variety of molded rubber products to some extent. Manufacturing operations that involve machinery often must contend with issues of vibration caused by moving parts. In order to protect workers, other machinery and the vibrating equipment itself, machinery that creates vibration is often secured using rubber washers or bushings that absorb vibration and prevent excessive movement. Rubber sheets are also used to absorb vibration; large, thick sheets are often placed beneath machinery that creates vibration. This also can reduce noise, which improves working conditions. Rubber grommets are used in industrial, commercial and consumer contexts. A rubber grommet is a rubber shape that fits around a hole in a surface; the grommet can protect wires or other hardware that passes through the hole, or grommets can protect the holes from becoming torn or otherwise damaged. Wire entry ports in electrical paneling are often fitted with grommets to prevent wires from becoming damaged or disconnected. Simple rubber grommets can also be used in office desks, which are often drilled with holes to allow for the passage of wires from computers and other office hardware to electrical outlets.
For every given molded rubber product application, a host of raw rubber materials are available. Natural rubber, which may be the best known rubber variety, has been in use on an industrial scale since the 19th century (rubber’s first suspected uses are prehistoric, and the earliest known use of primitive rubber was by the Mayans around 1600 B.C.E.). Fueled by conflict and scarcity during the first half of the 20th century, synthetic rubber development flourished and gradually began to replace natural rubber development; natural rubber now accounts for less than half of all the rubber materials produced worldwide. Neoprene was the first synthetic rubber produced on an industrial scale, and it and other materials like it feature all of the desirable qualities of natural rubber, but few of its undesirable qualities. Synthetic rubber like EPDM, silicone and neoprene can be engineered to varying levels of resistance to corrosion, chemical inertness, heat resistance, ozone resistance, strength, durability, flexibility, rigidity and many other properties. Industries for which natural rubber products were not practical can now enjoy the benefits of rubber products without enduring the problems they can also cause. Health care facilities, for example, which make extensive use of rubber tubing, must make considerations for patients with latex allergies (natural rubber is derived from rubber latex). Silicone tubing allows for the transmission of intravenous fluids without causing allergic reactions.
There are many kinds of rubber molding, the most common of which are injection molding, liquid injection molding, compression molding and transfer molding. Each method is similar, though of the four injection molding is the most widely employed method of rubber molding. The injection molding process begins with a collection of raw rubber stock in a hopper suspended above a conveyance channel. When the stock is released, a large, turning screw within the conveyance channel forces the stock toward a mold cavity at the end of the channel. Friction caused by the turning screw heats the rubber to a molten state; by the time it reaches the end of the channel, the rubber is completely molten and ready to be formed. The mold at the end of the channel is a specially-designed opening into which molten rubber is injected. The rubber fills the cavity and forms along its contours. The combination of heat and pressure applied to the plastic ensures that it completely fills the cavity, allowing for uniform, complete distribution of rubber throughout the mold. Once the rubber has taken the shape of the mold, it is allowed to cool and harden. The newly molded rubber product is then ejected from the mold, cleansed of imperfections (like seams) if necessary and prepared for shipment or further processing.