Archives

Category Archive for: 'injection molding'

        Any successful method of controlling the quality and the cost of a product depends heavily on the consistency of the process used to manufacture that product. Consistency can only be achieved by tightly controlling as many parameters as possible used during the manufacturing process. The environment on injection molding The environment …

Hot-runner molds offer significant processing advantages. Of primary importance is the material savings that results from elimination of the runner system. A hot-runner system represents in essence an extension of the machine nozzle through which the plastics melt flows directly into the cavities. For parts having identical weights, the amount of material to be plasticized …

What are the sprue,runner or gate? Sprues,runners and gates fulfill the function of conveying the plastics melt from the nozzle of the injection unit to the individual cavities. While it is true that they may be reused in the form of regrind, their presence nevertheless means a reduction in the performance of the injection molding …

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 when establishing the dimensions of the cavities. Shrinkage also causes the molded parts to sit …

  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 resistance, friction coefficient, fatigue properties, and the like.  if it only rely on the improvement …

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 formed. https://res.cloudinary.com/dl8a9jvpa/video/upload/v1515562261/Undercuts_ni5xth.mp4   This point is frequently overlooked, and many products are designed with undercuts …

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 …

...3456