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Guide To Plastic Moulding

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By Author: Rajesh Dudhat
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Even the mouse and the keyboard that you use are made through plastic moulding. The plastic parts of the chair that you are sitting on are formed this way.

The basic knowledge in plastic moulding is inserting molten liquid plastic into a ready shaped mould, for example, the mould of a bottle. It will be then allowed to cool, then the mould will be removed to reveal the plastic bottle.

Plastic moulding can be made customized mould a for a wide variation of plastic products including cabinets, office trays and boxes, garden pots, barriers, barricades and traffic signage and displays for product and marketing promotions.

If you are planning to go into the plastic moulding business, the beginner should first know the various processes. Select from a plastic moulding process that fits your budget, your expertise, and your resources. Here are basic definitions of numerous methods of plastic moulding.

The Plastic Molding Processes:

Injection Moulding

In Injection Moulding, melted plastic is forced into a mould cavity. Once cooled, the mould can be removed. This plastic moulding process is normally used in mass-production or prototyping of a product. Injection moulding machines were made in the 1930’s. Injection moulding is used to mass produce toys, kitchen utensils, bottle caps, and cell phone stands to name a few.

Blow Molding

Blow moulding is like injection moulding excluding that hot liquid plastic pours out of a barrel vertically in a molten tube. The mould ends on it and forces it outward to conform to the inside shape of the mould. When it is cooled, the hollow part is shaped. Samples of blow moulding products are tubes, containers and bottles
Equipment’s needed in setting-up a blow moulding business are comparatively higher than injection moulding.

Compression Moulding

In this type of plastic moulding, a shot of hard plastic is pressed between two heated mould halves. Compression moulding regularly uses vertical presses instead of the horizontal presses used for injection and blow moulding. The parts formed are then air-cooled. Prices of equipment’s used for compression moulding are reasonable.

Film Insert Molding

This plastic moulding technique imbeds an image beneath the surface of a moulded part. A material like fabric or film is inserted into a mould. Plastic is then injected.

Gas Assist Molding

The gas injection moulding is in usage to create plastic parts with hollow interiors. Incomplete shot of plastic is then followed by high-pressure gas to fill the mould cavity with plastic.

Rotational Moulding

Hollow moulds packed with powdered plastic are secured to pipe-like spokes that extend from a central hub. The moulds rotate on separate axes at once. The hub swings the whole mould to a closed furnace room causing the powder to melt and stick to the insides of the tools. As the moulds turn gradually, the tools move into a cooling room. Here, squirted water causes the plastic to harden into a hollow part. In this type of plastic moulding, tooling costs are low and piece prices are high. The Cycle will take nearly 40-45 minutes.

Structural Foam Moulding

Structural foam moulding is a process of plastic moulding usually used for parts that require thicker walls than standard injection moulding. Implanting a small amount of nitrogen or chemical blow agent into the plastic material makes the walls thicker. Foaming happens as the molten plastic material enters the mould cavity. A reedy plastic skin forms and solidifies in the mould wall. This kind of plastic moulding can be used with any thermoplastic that can be injection moulded.


In this plastic moulding method, sheets of pre-extruded rigid plastics are horizontally heated and drank down into hollow one-piece tools. When the hot plastic solidifies, its shape adapts to that of the mould.

Tooling costs are regularly low and piece prices vary on the machinery
Plastic moulding is a very technical process. It needs specialists in this type of manufacturing business for it to be competitive in the market. Therefore, a very scientific and systematic study should be first finished before going into this endeavour.

More About the Author

R.D Mould & Industry is a leading exporter of plastic spoon Mould manufacturer,Ice-Cream Spoon Mould, Silver Plated Spoon Mould manufacturer, Plastic Fork & Knife Mould and Unique Spoon Mould, and Disposable Plastic Spoon Mould. We have more than 15 years experience our clients are around the world from the various countries.

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