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Register to Remove Trial Watermark!! CHAPTER 4 – RESOURCES 4.1 Main resources The main resources required for the project include the following. - Land and building - Plant and machinery - Raw materials vis linear low density polyethylene (LLDPE) granules, carbon black, pigment and colors - Power - Skilled and non-skilled workers 4.2 Raw materials – consumption pattern Polyethylene in its many forms accounts for over 85-90% of all the polymers which are rotationally moulded. Among polyethylene also Linear Low Density Polyethylene (LLDPE) accounts for major share. PVC plastisols make up for about 12% of the world consumption. Poly carbonate, nylon, polypropylene, unsaturated polyesters, ABS, polyacetal, acrylics, polystyrene, celluloses, epoxies, fluorocarbons, phenolies, Polybutylenes, polyurethanes and silicone accounts for the rest of consumption. 4.3 Grinding and coloring of LLDPE prior to moulding The polyethylene materials used for rotational molding is always in the form of powder or micro pellets. Micro pellets form is a relatively recent development and although it has many attractive features powder still accounts for over 95% of polyethylene used in roto molding, powder is produced by pulverization some time also called grinding or attrition mill. Most commonly used grinding machines use the principle of high speed rotating metal plates. As in case of all plastic molding processes, imparting the required colour to the product is an essential part of roto molding process also. There are a number of methods to impart colour to the raw material / end product. The processes used for imparting colour to the raw material include the following: 4.3.1 Dry Blending Dry blending is the most popular method of colouring rotational molding grade plastic powders. It is attractive because cost savings can be made by purchasing bulk quantities of natural material and colouring this as required prior to molding. The following types of blenders are commonly used for blending colors with plastic powder: - Ribbon blending Register eDocPrinter PDF Pro Online Now!! 18PDF Image | ANALYSIS OF ROTO-MOULDED PLASTIC CONTAINERS
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