The Plastic Moulding Process at a Glance

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Information about The Plastic Moulding Process at a Glance
Business & Mgmt

Published on February 26, 2014

Author: mattstudge

Source: slideshare.net

Description

Commonly, there are two different types of plastics available in the market. These include thermoplastics and thermosets. The primary difference between these two types of plastics is quite clear. While the thermosets harden at high temperatures, thermoplastics melt. This difference is usually caused by the polymers which form the two types of plastics. Thermoplastics are formed by polymers which look like a chain of atoms in a one-dimensional string. Since thermoplastics can be melted at high temperature, they can be easily reshaped. On the other hand, thermosets contain polymers with three dimensional chains. Therefore, they are able to stay in shape.

The Plastic Moulding Process - At a Glance Commonly, there are two different types of plastics available in the market. These include thermoplastics and thermosets. The primary difference between these two types of plastics is quite clear. While the thermosets harden at high temperatures, thermoplastics melt. This difference is usually caused by the polymers which form the two types of plastics. Thermoplastics are formed by polymers which look like a chain of atoms in a one-dimensional string. Since thermoplastics can be melted at high temperature, they can be easily reshaped. On the other hand, thermosets contain polymers with three dimensional chains. Therefore, they are able to stay in shape. An Overview of Plastic Moulding: The basic idea laying the foundation for plastic moulding is pouring liquid plastic into a mould. For instance, you can use the mould of a bottle. The liquid plastic is allowed to cool down. Then, the mould is removed to reveal the plastic bottle. With plastic moulding, you can also custom mould a wide range of plastic products like cabinets, garden pots, boxes, office trays, barricades, barriers and displays for marketing and promotions. If you’ve been planning to enter this business, you need to understand the different moulding processes. A lot of different moulding processes are used for moulding or shaping plastic using either thermosets or thermoplastics. You can even use a combination of these two different types of plastics. While there are many different types of moulding processes, the most common ones include injection moulding, extrusion moulding and blowing moulding. Injection Moulding: This is one of the most popular moulding processes for plastics. The basic principle used for injection moulding is quite similar to extrusion moulding. Raw plastic is fed to the melting chamber with a hopper. The melted plastic is put in a cold mould with high pressure. Since the mould is cold, the product is cleaned and finished. Some items which are commonly manufactured with injection moulding include butter containers, bottle caps, toys and lawn furniture. Extrusion Moulding: This plastic moulding process starts with raw plastics like pellets, beads and powder. First of all, the raw plastic is fed into a revolving chamber. This chamber is called the extruder. It turns and melts the plastic. You can use the melted plastic to form a shape you want. The finished product is dropped on a conveyor belt and cooled with water. Last but not the least, cutting and finishing touches are required. Some items which are commonly manufactured from this method include sheets, pipes and films. Blow Moulding: This is another popular plastic moulding process. This process uses a blowing method after the injection or extrusion moulding. In the extrusion process, melted plastic uses a particular dye to create a heated plastic tube with a cool mould around it. In the extrusion blowing process, compressed air is blown through the plastic tube so that it forces the plastic to make a hollow shape inside. With this particular moulding method, the manufacturer does not need to attach any different injection moulded parts. On the other hand, injection blowing process blows the melted mould into the final shape in a different mould. For more information, please visit: www.inter-plas.co.uk

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