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Plastic Moulding Techniques - Rotational, Injection, Compression, Blow

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While there are many plastic moulding processes and techniques, this website discusses only the techniques of rotational moulding. However, the following article entitled Your Guide to Plastic Molding is a good overview for the various plastic moulding processes. Your Guide To Plastic Molding. Written by: John Morris. Even the keyboard and the mouse that you use are made through plastic molding. Even the plastic parts of the chair that you are sitting on are created this way. If you are planning to go in...

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The Blow Moulding Process

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The Blow Moulding Process. The blow moulding process, in comparison with injection moulding. Is a low pressure process with typical blow air pressures around 25 to 150 psi. There are several different types of blow moulding. An overview of each process is outlined below:. Click to View Simulation. Extrusion blow moulding can be used to process many different polymers including polyethylene. The preform is then heated above its glass transition temperature and blown, using high pressure air, into bottles ...

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Polyethylene | Chemical Composition and Properties

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By far the most popular thermoplastic commodity used in consumer products (especially products created by rotational moulding. Polyethylene is created through the polymerization of ethylene (i.e., ethene). The ethylene molecule is C. Polyethene, Polythene, PE, LDPE, HDPE, MDPE, LLDPE. Low Density Polyethylene) is defined by a density range of 0.910 - 0.940 g/cm. High Density Polyethylene) is defined by a density of greater or equal to 0.941 g/cm. Linear-Low Density Polyethylene) is defined by a density r...

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Polymers Used In Plastic Moulding

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Polymers Used in Plastic Moulding. The term polymer describes classes of molecules with large numbers of repeating structural units connected through covalent bonds. The major identifying feature distinguishing polymers from other molecules is the repetition of many similar, identical, or complementary subunits. HDPE, LPDE and LLPDE). Although PVC. A paper written by J.D. Ratzlaff of Chevron Phillips Chemical Company LP in 2004 entitled " Polyethylene: Process Sensitivity in Rotational Moulding.

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The Rotational Moulding Technique

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The Rotational Moulding Technique. The rotational moulding technique consists of 4 separate operations:. The process begins with filling a hollow mould with a pre-determined quantity of polymer powder or resin. This powder can be pre-compounded to the desired color. More often than not the powdered resin is polyethylene. PE) although other compounds such as polyvinyl chloride. The History of Plastic Moulding. Polymers Used in Plastic Moulding. Examples of Moulding Work. History of Plastic Moulding.

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The Plastic Injection Moulding Process

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The Plastic Injection Moulding Process. Because of its high viscosity, in order for plastic injection moulding to be successful melted polymer must be injected into a hollow mould with a large force. Feeding the polymer resin. Injection of Polymer Melt Into the Mould. After solidification, the clamp holding the two halves of the mould together closed is opened allowing the part to be removed. The injection moulding process can then be repeated. Injection Molding - How Plastic is Molded. Plastic has, quit...

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Polypropylene | Checmical Composition and Properties

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A thermoplastic polymer, polypropylene (also called polypropene) has properties between that of LDPE. And is one of the most versatile polymers available. The symbol for polypropylene developed by the Society of the Plastics Industry so that items can be labeled for easy recycling is:. Semi-rigid, translucent, good chemical resistance, tough, good fatigue resistance, integral hinge property, good heat resistance. 095 - 1.30 N/mm. 30 - 30.0 Kj/m. Thermal Coefficient of Expansion:. 100 - 150 x 10.

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Examples of Plastic Moulding

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Examples of Plastic Moulding Work:. Following are some examples of work done by various plastic moulding manufacturers. Click each sample to view larger images:. The History of Plastic Moulding. Polymers Used in Plastic Moulding. History of Plastic Moulding. Examples of Plastic Moulding. 105;nfo@PlasticMoulding.ca. Website Sponsored by D&M Plastics Inc. History of Plastic Moulding.

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Polyethylene | Chemical Composition and Properties

http://www.rotationalmoulding.ca/materials/polyethylene.htm

Moulds, Polymers, and Machinery. By far the most popular thermoplastic commodity used in consumer products (especially products created by rotational moulding. Polyethylene is created through the polymerization of ethylene (i.e., ethene). The ethylene molecule is C. Polyethene, Polythene, PE, LDPE, HDPE, MDPE, LLDPE. Low Density Polyethylene) is defined by a density range of 0.910 - 0.940 g/cm. High Density Polyethylene) is defined by a density of greater or equal to 0.941 g/cm. Linear-Low Density Polyet...

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Nylons | Chemical Composition and Properties

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The term "nylons" refers to the group of plastics known as polyamides. Nylon is used in the production of film and fiber, but is also available as a moulding compound. Its properties are determined by the R and R' groups in the monomers. In nylon 6,6, R' = 6C and R = 4C alkanes, but one also has to include the two carboxyl carbons in the diacid to get the number it donates to the chain. 90 - 185 N/mm. 50 - 13.0 Kj/m. Thermal Coefficient of Expansion:. Max Continued Use Temperature:. C (302 - 365.