How are erasers made

The process of making rubber is as follows:

I. The main raw material for rubber can be natural rubber or synthetic rubber. Natural rubber is mainly from the emulsion of the rubber tree, while synthetic rubber is obtained through chemical synthesis. Preparation of materials is a prerequisite for the production of rubber.

Two, the first step in making rubber is to collect the natural rubber emulsion. Workers would make a shallow cut in the bark of the rubber tree so that the lotion would flow out and be collected in a container. This process is called milk harvesting.

Collected emulsion will be left for a period of time to allow impurities to precipitate, this is a very critical step, if the precipitation of the wrong rubber production will be declared a failure.

Third, the emulsion is then processed. Workers need to send the emulsion to the filtration plant to remove impurities. Then proportions of vulcanizing agents and other additives are added to the emulsion to ensure that the rubber has the desired properties. The types and proportions of additives depend on the use of the final product and the corporate recipe.

Fourth, the treated emulsion will be further intensified processing. A mixer is often used to blend the emulsion with other auxiliary materials to improve the elasticity and plasticity of the rubber. During the mixing process, the emulsion is often heated to make it more viscous, in order to better air out of it and make the texture of the rubber become fine and smooth.

Fifth, next is the calendering process. After mixing, the rubber is put into a calender, where it is molded into the desired shape by continuous extrusion and stretching. This step is usually repeated until the rubber reaches the desired thickness and size.

Sixth, then the rubber will enter the vulcanizing room for vulcanization. Vulcanization is the process of heating the rubber to a certain temperature and exposing it to a vulcanizing gas, which cross-links the rubber molecules and increases its elasticity and abrasion resistance. Vulcanization time and temperature still depends on the specific rubber formulation and requirements.

Seven, after the completion of vulcanization, the rubber will be cooled and trimmed, and finally become the familiar rubber products. During this process, the rubber may be cut into various shapes and sizes, and colors or coatings may be added to change the appearance and function.