Natural rubber is produced from a number of various trees that produce latex which is a milky white substance. There are over 400 of plant and tree species that produce latex but the latex that is used in natural rubber comes from the rubber tree plant.
The first step in making natural rubber is to collect latex from the trees. Rubber trees in large plantations are planted and in the morning when it is cool, the slits are cut into trunks of trees. Special buckets and cups are fixated to the trees under the slits to collect the dripping latex. These will be left for about 3 hours and then they are transported quickly into a rubber factory for processing. Leaving the latex to sit will make it naturally coagulate which cause it to be useless for making rubber.
The latex is heated and then mixed with acid ammonia in order for the rubber curds to be formed. There are some manufacturers of rubber that add sulfur to it to make it harder and stable. The crude rubber is made as the latex is heated and then the solid chunks surfaces into the liquid. Then it is skimmed from the top and run through huge heavy rollers in order for the excess water to be removed. This will press the rubber into thin long sheets that are transported to other factories for manufacturing of rubber products.
Synthetic rubber is produced from substances such as coal, natural gas, oil, petroleum and acetylene. Petroleum based chemicals are then heated in the same way that the natural latex is, forming the same clusters of crude rubber. Then the rubber is dried and then transported to other factories where it will be rolled into sheets and be prepared for molding. Extrusion is where the rubber is heated and then forced through a small opening to produce huge strands of rubber.
On the other hand, the injection molding is actually where the rubber is heated and forced into molder under high pressure. Then the rubber is left to cool in the mold and released. The compression molding is where the rubber is contracted on a particular mold under pressure to maintain its shape.