There are several different methods of rubber molding used in manufacturing, each with its own technology. Compression molding, transfer molding and injection molding are common methods that each have their own advantages. Whether your project requires you to work from a simple, standard design or a specifically engineered print or design, the type of rubber molding method used can have a substantial impact on your project.
As a product engineer, it’s important to consider the variety of rubber molding methods available in manufacturing. Things to consider include cost effectiveness, manufacturing processing time, and overall engineering requirements, such as flexibility, durability, and stability. Your project can be affected if the method of manufacturing isn’t well suited to every aspect or can’t meet your specifications. Consider the available methods and above all, use a professional manufacturer with experience in all types of rubber molding techniques.
Compression molding is an advanced rubber manufacturing method that is well suited for mass production of rubber parts and products. This practical method uses heat and pressure to bond rubber compounds and create a precise shape and size. The manufacturing process is relatively simple and involves a steel mold that is closed and heated, resulting in the melting of the rubber compound as it is forced into the mold cavities to form the desired shape. Once the mold is removed, any excess material is trimmed away and the result is a precise component with little seam.
Compression molding has many advantages and is highly suited for mass production. There is little waste when using this method and as a result, it can be a relatively inexpensive option. Compression molding may be most suitable for larger, more complicated parts or for achieving parts with thicker sections. While compression molding is a method suited to any size or shape, including “micro” parts, it may not be the most suitable option for delicate parts or more fragile shapes.
Transfer molding is another rubber molding technique that involves a four-step process. Transfer molding involves uncured rubber being forced through a mold by hydraulic pressure and then being allowed to cure. While the cycle time is actually shorter with transfer molding than compression molding, there is more waste because the transfer pad is scrap. However, transfer molding may be a better choice for rubber-to-metal bonding.
Rubber-to-metal bonding, or simply rubber bonded to metal components, may become necessary to quiet vibration and ensure smooth operation of an engineered structure. It may also be necessary to maintain structural integrity. Be sure to use a method of rubber-to-metal bonding that utilizes the right substrate and bonding agent.
Injection molding is also a common form of rubber molding and best suited for silicone molding. Silicone rubber is a highly stable, flexible compound that is able to resist extreme temperatures. Silicone is odorless, does not conduct electricity and is ideal for machinery that must operate under high pressure or high temperature. While silicone molding may not be the best choice for very large or thick objects, it is highly suitable for smaller parts that require flexibility and resistance to the elements.
Silicone is also ideal for products used outdoors, such as sporting goods, camping and hiking gear, as well as seals, gaskets, membranes, and other industrial parts and products. In addition to injection molding, other silicone molding methods, such as compression or extrusion molding can be used. Silicone will exhibit the properties of stability, flexibility, and durability in the finished part. However, the process is more complicated than other forms of rubber molding and it’s essential to use a manufacturer experienced in silicone rubber processing to ensure the parts are made precisely to specification.
Because there are many different methods of rubber molding that are suitable for applications across many different industries, it’s important to work with a manufacturer that can help you choose the best approach. When obtaining quotes, be sure you select a manufacturer that can make your parts precisely to your specifications, including size, shape, and type of compound, with no problem. Choosing the right method of manufacturing, as well as the right compounds for your desired parts or components is essential to seeing your project through to completion on time and within your budget.
Our custom rubber molding includes any shape of rubber parts such as o-rings, gaskets, washers, oil seals, square rings, quad rings, D- rings, X-rings, u-cups, grommets, diaphragms, packings, rubber boots, rubber balls, rubber bonded to metal and productions per your prints and designs.