Among the major advantages of hot-runner molds is the material savings that result from eliminating the runner system. In essence, hot-runner systems are extensions of the plastic injection machine’s nozzle through which the plastic melt flows straight into the cavities.…
Plastic Mould Ejection Injection moulding compounds exhibit a certain amount of shrinkage，i.e., in a cooled condition, the volume is somewhat smaller than in a heated condition. If parts with accurate dimensions are needed, allowances must be made for this shrinkage…
Mold surface treatment technology In addition to the reasonable cooperation of the steel strength and toughness, its surface properties are critical to the work performance and service life of the mold. These surface properties refer to: wear resistance, corrosion…
Undercuts Modern molding practice dictates certain principles of design which should be observed if molded articles are to be produced successfully. Most elementary is the fact that the piece must be easily removed from the mold after it has been…
Flash Lines Flash in injection molding refers to excess plastic material that is extruded beyond the boundaries of the intended part. This excess material can be found in small gaps or seams between different sections of the mold or along…
Scope There is no easy solution to the problems encountered in designing molded articles of plastics. The design will often hinge on what is the best process of molding for the piece in question. The selection of the molding process…
Heating The correct heating of hot runner manifold systems is very important and is crucial to the success of the tool in production. There must be good heat transfer between the heater and the surface being heated or the…
Thermoplastic Sheet Forming Method Cold bending. Simple circular or cylindrical Vacuum forming or blow molding in female mold shapes. The thicker the sheet, the larger the bend diameter must be to prevent high stress concentrations. Ex: consumer packages. Hot line bending.…
Design rules Designing molded reinforced plastics parts is difficult because of the large number of variables encountered in the material and the process, and the difficulty of controlling some of them. These variables include: composition of the resin, including fillers,…
Reinforced Plastics Molding The term “reinforced plastics moldings,” as used here and in the plastics industry, refers to parts produced by impregnating a reinforcing material, in the form of cloth or mat, with a liquid thermosetting or thermoplastic resin, laminating…
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