Methods of Processing Plastics

Filed in Economy, How To by on March 9, 2020 0 Comments

Methods of Processing Plastics are explained in this article. Reading it will avail you the necessary information you need.

Plastics are materials that can be reshaped or remoulded by applying heat and pressure. Most plastics are made from synthetic resins or polymers through the process of polymerisation. Plastics are soft enough to be moulded yet capable of hardening into a desired shape and form.

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Methods of Processing Plastics

Methods of Processing Plastics – Photo Source: https://plastics.americanchemistry.com/

Methods of Processing Plastics

Production of plastics involves mixing some raw materials and heating them at a very high temperature. Raw materials for plastics are obtained as chemical compounds from crude oil. The raw materials are in an unrefined state.

Resin for the instance is one of the raw materials and it is a by-product of crude oil distillation. Resin is mixed with other materials and colour to produce plastic.

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The mixture is heated to become soft. It is then shaped and moulded into any desired shape, cooled and hardened. The cooling can be done using air, water or solvents.

Furthermore, several methods are used in the processing of plastics. The method used depends on the type of plastics to be made, which will be used for the cost of production.

The Methods of Processing Plastics are:

1. Extrusion Moulding

This is the commonest method of processing plastics. In this method, an extraction moulding machine is used. The raw materials for making plastics are fed into part of the machine called funnel or feeder hopper.

Heat is used to dissolve the raw materials into a molten form. The molten form is cooled and gas into the forming die of the machine where the plastic is formed.

The shape of the opening in the forming die determines the form of plastic is made. This method is used to produce plastic pipes and tubes.

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2. Injection Moulding

Injection Moulding is used to produce both small and large plastics but the machines are costly and this makes the process costly too. In this method, the plastic powder or granules are heated until there are soft and can flow.

There are then injected into a closed cavity where it is cooled to form the desired shape. The solid plastic is then removed from mould. Due to the high cost of this method, it is mainly used where a large quantity of various sizes of plastics is needed.

3. Calendaring method

The calendaring method deals with finishing and smoothening of a produced plastic product. It is the final stage in the process.

The produced plastic is passed between heated rollers in a calendaring machine in order to smoothen it and give it a shiny surface. Plastic materials like polyvinyl chloride are processed in this way.

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4. Compression moulding

In compression moulding, the powdered raw material is placed in an oven and heated at a very high temperature. The molten form is then forced into a mould and compressed into a specific shape by applying pressure.

In Conclusion, the compressed method is mainly used in the production of plastics. When it comes to plastic production every mould cavity has both female and make sections.

The female section contains the cavity where the materials are formed and pressure is used to the force the male section in the production of plastics.

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