Service providers of rubber moulding use different materials and methods to manufacture products of rubber like caps, grips and seals. Most production methods of rubber molds are carried out by pouring rubber which is in the liquid form into a heated, cooled and expandable or even a two-part mold. Later, pressure, temperature or air forms this material into the finished product. Requirements of the application, like temperature and resistance, are the major determinants of the materials which are used.
As there are different processes for manufacturing, specific ones are used in tandem with the requirement. Few of the different rubber moulding processes are:
Compression Moulding Process
A piece of rubber, which is uncured and has been performed to a controlled shape and weight, is directly placed into the cavity of the mold before closing the mold. Once the mold is closed, the material tends to be compressed between the two plates causing the compound to fill the specific cavity. This is held under pressure, which is high and elevated temperature, so as to activate the system of curing in the compound of rubber also referred as Vulcanizing. The time cycle is established to reach the maximum level of cure. At the end of this, the parts are either ejected or removed from the specific cavities. This type of moulding can be cost effective as there is almost negligible requirement of any tools. This process also works out most suitable from cure and elastomeric systems.
Rubber Injection Molding
This process of injection molding needs to have the material prepared before the actual process can begin. This material is mixed in a bulk and immediately stripped into specific measured strips. These strips are then fed into a special screw which is able to fill the barrel with the rubber material which is predetermined. With this type of molding, there is no requirement of any pre-forms or placement of operators. This process tends to pre-heat the material before filling up the cavities and thus allows easy flow of the material. The cavities tend to filled rapidly due to low viscosity. The time required is not much which makes this an economical process with minimum wastage of material.
Transfer Molding of Rubber
Before the start of the process, the moulding material is measured in an appropriate manner. After which, it is inserted and placed into the pot for molding. Due to high heating, it is transferred by pressure into the mold cavities. An uncured piece of rubber is positioned well into one part of the mold. Using hydraulic pressure, the mold is the closed, forcing the rubber into the cavity through a small hole. This mold is kept closed, which helps the rubber to cure. After this the plunger is lifted up and the pad for transfer is removed. The part can be removed after opening the mold. Any flicker of material is cut appropriately and can be removed at this time. There are multiple benefits to this procedure as the pre-forms required are comparatively less. This also has a production cycle, which is shared with high design flexibility.
Choosing Rubber Moulding Services
You can make the right choice of these services by making sure that the company offering these services can provide all the different processes used in rubber moulding. You can also compare the cost of these services with other companies before you make a final decision. Comparing prices can go a long way in budgeting and saving. It is advisable to ask for specifications about the parts which can be manufactured by them as this helps to accelerate your decision and close the deal quickly.
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