Injection and compression moulding are the most common methods used in the manufacturing of plastic products, such as polymers, thermoset resins, epoxy resins and rubber etc. The product is first manufactured using a mould, after which it is passed through a cooling process at high pressure. As a result of this, the liquid is forced through the mould under very high pressure, and at very high temperatures. After it has been cooled down to room temperature, the mould is removed and the substance is then passed through a sealing process, to ensure that it is waterproof, strong and free of blemishes. Injection moulding and compression moulding processes are now commonly used for the manufacture of rubber and other high quality industrial products.
There are many advantages to using these two processes. For one, injection moulding makes it possible to create very complex shapes, such as toys, gears, car wheels, etc. because the product can be produced in a large number of small parts, rather than using a single large mould to produce the same item. On the other hand, the increased production rate and lower costs associated with the two methods make them highly cost-effective alternatives to conventional moulding methods. Find out more about Rubber Moulding at a site such as Meadex rubber moulding
However, although injection and compression moulding are widely used, there are several limitations in using these two methods. Most importantly, injection moulding involves the use of force, and often this leads to problems, such as tears, cracks and warping of the product. This is because the force used is not completely contained within the plastic, and therefore leaks outwards. Another problem is that the product can suffer from poor adhesion to the mould walls, as a result of hot air being trapped inside the mould, leading to excess gas consumption during the manufacture of the product. Lastly, although high pressure injection moulding allows for more control over the mould design and therefore better consistency in the end product, it is often difficult to achieve precision and accurate diameters.
Injection moulding is generally used for making tubular objects or items that need to have a very hard, thick, resilient exterior shell. The process uses a series of pressurized streams of gamolenic acid, nitrogen or either ammonia or nitrogen dioxide. Depending on the kind of object, it is sprayed or blown dipped in these fluids and forced into cavities by high pressure.
This process is heavily used to make complex products, such as electronics parts. It is also used to make simple objects, such as toys or components. It is used extensively in the industrial and manufacturing processes for a wide range of products. Because the injection and compression moulding processes can easily be automated, it has made the process less labour intensive, therefore cheaper than traditional ways of creating parts and products.
As you can see, the injection and compression moulding process can be a complex one. There are many kinds of models and machines used, and even more kinds of material to use to manufacture the parts.