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…
Thermoplastic Sheet Forming MethodCold 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…
Design rulesDesigning 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…
Reinforced Plastics MoldingThe 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…
The plastic molding process cycleWe 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…
castingMaterials. 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…
Cost of injection molding partsIn three forms it is important to consider how the costs of injection molding are determined:Cost Related To The Injection MoldingTo assess molding prices, four basic elements must be analyzed:The volume or expenses per cubic inch…