Plastics require less energy to process than metals. Molding shrinkage will occur in the process of cooling solidification of molten resin. As the name stated blow molding, in this process, the plastic is melted and made a hollow tube. It is the physical model of the casting used to make the mould. More important, the process and subsequently the moulded components are affected. Injection molding is the process of making custom plastic parts by injecting molten plastic material at high pressure into a metal mold. This cavity is filled with metal to become the casting. Kalpakjian and schmid typical sand molds have the following parts see figure 2. Schematic showing steps of the sand casting process source. When changes to a particular process variable or machine setting do occur which significantly affect the stability of the moulding process so that defective. Where in other plastic molding processes the outer contour of products is thinner. As for the injection molding machine, several types such as plunger type, plunger preplasticating type, screw preplasticating type and inline screw type, etc. Plastic processing can be defined as the process of converting the plastics raw material into semifinished products. The dashboard of a car, bottle caps, plastic cup lids etc is made with injection molding process.
Plastic manufacturing relies on different types of molding processes to form liquid, melted plastic into solid shapes. The mould is made by packing some readily formed aggregate material, such as moulding sand, surrounding the pattern. Casting is a basic molding process as it requires the least amount of complex technology. Therefore, showing liquidity by flow length of spiral or bar flow type mold is. Injection, extrusion, blow, compression and transfer moulding. At the end of the article also you get a pdf downloadable link of this. Buckets, automobile parts, crates, tanks, pipes, bottles, carry bags, ropes, profiles etc. A field survey of the cast products shows that they.