Rolling and extrusion in the plastic production process

Calendaring is a process whereby sheets of thermoplastic material are prepared by passing a fine polymer heated between two or more rolls. Usually, the roll for the works of this sheet consists of 4 – 5 main rolls. The composition of the roll there is a variety of arrangements I, L, F, and Z. Meanwhile, perhaps you also need to take a look at the trusted Chinese mold company that you can hire.

In the calendering process, the plastic is made into a roll between two rolls that make it to an then passing about one or more additional rolls before removing it as a continuous film. Cloth or paper can be fed through the last roll, so they become impregnated with plastic.

The working principle of Roll machine

Thermoplastic is melted on the extruder and then in the exit. The plastic in the melting state is placed between roller bearings and rolled to form into sheets. This plastic is transferred to the conveyor belt and in the initial roll. The roller bearing is hot, and keeps the plastic state in semi-melt shape allowing it to be rolled in a thinner shape as the resulting roller is closer and closer to each other. From this roll is moved on the conveyor belt again, carried on the stirrer, out of this tool, transferred again with the conveyor belt to the rolling machine.

In this machine, the thermoplastic is rolled to fit the desired size and is carried on a towing roll. When the sheet thickness is in accordance with the criteria, then cooled on a cooling roll and then rolled.

Product Example with Calendering process:

Making sheets for raincoats; plastic sheets for baby bedding; plastic sheets used in homes; plastic cover seats.


Extrusion molding is a process of making plastics (thermoplastics) in the form of profiles or formations that are equal to the size of the length is large enough. This process is used to make pipes, hoses, straws, etc. This technique is the oldest method in plastic molding and is currently still used for thermoset plastic printing.

In this process, plastics or granules are homogeneous and are continuously formed. Products made in this way include tubes, pipes, sheets, wires and coating substrates, and profile shapes.