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Draft angle design is an important factor when designing plastic parts. Because of shrinkage of plastic material, injection molded parts have a tendency to shrink onto a core. This creates higher contact pressure on the core surface and increases friction between the core and the part, thus making ejection of the part from the mold difficult.
Figure 1: Comparative Costs and Production Volumes For Processing of Plastics. The economics of plastics processing is determined by the type of process.Plastics can be processed with the following methods: machining, compression molding, transfer molding, injection molding, extrusion, rotational molding, blow molding, thermoforming, casting, forging, and foam molding.
Journal of Materials Processing Technology is a peer-reviewed scientific journal covering research on all aspects of processing techniques used in manufacturing components from various materials. It is published by Elsevier and the editor-in-chief is J. Cao ( Northwestern University ).
The International Journal of Machine Tools and Manufacture is a peer-reviewed scientific journal dedicated to report the latest advancements in the fundamental understanding of mechanics of processes and machines applied to the manufacture of engineering parts made of metals, composites, ceramics and other structural/functional materials. [1] [2]
Filter for nozzle with a plastic toy next to it. Injection moulding is used to create many things such as wire spools, packaging, bottle caps, automotive parts and components, toys, pocket combs, some musical instruments (and parts of them), one-piece chairs and small tables, storage containers, mechanical parts (including gears), and most other plastic products available today.
The journal is abstracted and indexed in Scopus and the Science Citation Index.According to the Journal Citation Reports, its 2013 impact factor is 0.661, ranking it 32nd out of 39 journals in the category "Engineering, Manufacturing" [2] and 80th out of 126 journals in the category "Engineering, Mechanical".
The impact factor relates to a specific time period; it is possible to calculate it for any desired period. For example, the JCR also includes a five-year impact factor, which is calculated by dividing the number of citations to the journal in a given year by the number of articles published in that journal in the previous five years. [14] [15]
The blow molding process begins with softening plastic by heating a preform or parison. The parison is a tube-like piece of plastic with a hole in one end through which compressed air can enter. The plastic workpiece is then clamped into a mold and air is blown into it. The air pressure inflates the plastic which conforms to the mold.