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Category Archive for: 'injection molding'

Flash Lines Flash is defined as that portion of the material which flows from or is extruded from the mold during the molding. The designer must design specifically for molding. For example, it is impracticable to duplicate, by molding, the appearance of a handle which has been fabricated from wood or metal by machining. To …

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 is, in turn, determined by the choice of the molding material best suited to provide …

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 heater will fail prematurely. Heater channels in the manifold should be smooth in order to …

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. Two-dimensional shapes with arc, angle or channel cross section. Gradual to sharp bends, depending on …

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, catalysts and gardening agents, geometry of the reinforcing material, resin-reinforcement ratio, degree of saturation of …

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 the material into multiple layers, and curing with heat and pressure to form a dense, …

The plastic molding process cycle We are ready to study the actual plastic molding process cycle in the press room inasmuch as we have become familiar with not only the component parts of the mold itself but also the materials which are placed in them. The method of loading the cavities varies in accordance with …

casting Materials. Any resin available in liquid form can be cast. Castable resins include phenolics, polyesters, epoxies, silicones and acrylics. Types of molds. The type of mold used depends on the plastic, the size and shape of the part, and other design considerations. Draw mold一No undercut is possible. Flutes and scallops must run in the …

Cost of injection molding parts The cost of injection molding parts is related to many factors, but mainly to the following: The raw materials cost. The cost could be calculated easily, just ask suppliers of raw materials for the price. After the injection molding parts plus its loss (about 3%) multiplied by the price of …

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