Home » MFG Guide » Structural Factors to be Considered in Plastic Injection Mold Design

Structural Factors to be Considered in Plastic Injection Mold Design

Posted by: Mu Ju 2021-11-30 Comments Off on Structural Factors to be Considered in Plastic Injection Mold Design


  1. Parting surface, that is, the contact surface between the die and the punch when the die is closed. The selection of its position and form is influenced by the shape and appearance of the product, wall thickness, forming method, post-processing technology, die type and structure, demoulding method and the structure of the forming machine.


2, structural parts, namely, complex mold slide, oblique top, straight top block. The design of structural parts is very critical, which relates to the life of the die, processing cycle, cost, product quality and so on. Therefore, the design of complex mold core structure requires a higher comprehensive ability of the designer, and pursues a simpler, more durable and more economical design scheme as far as possible.


3, mold accuracy, that is, avoid card, fine positioning, guide column, positioning pin and so on. The positioning system is related to the appearance quality of products, the quality and life of dies. According to the different structure of molds, different positioning modes are selected. The positioning accuracy control mainly depends on processing. The positioning of internal molds is mainly considered by the designer to design a more reasonable and easy-to-apintejinust positioning mode.


  1. The pouring system, i.e. the feeding passage from the nozzle of the injection machine to the cavity, includes the main passage, the shunt passage, the gate and the cold hole. In particular, the selection of gate location should be conducive to filling the cavity of molten plastics in a good flow state, and the solid runner attached to the product and the cold material of the gate are easy to eject and remove from the moldwhen opening (except the hot runner mold).


  1. Shrinkage of plastics and various factors affecting dimensional accuracy of products, such as manufacturing and assembling errors of moulds, wear of moulds, etc. In addition, when designing the die and injection mold, the matching of the process and the structural parameters of the molding machine should also be considered.



PTJMould Industrial Company Limited, established in 2010, is a leading injection moulding manufacturer in China. PTJMould specializes in plastic mould production for household appliances, medical equipments, electronic equipments, safety equipments as well as monitoring system.

The company has over 15000 square metres factory. With plastic injection tooling divisions possessing different machinery and expertise, PTJMould offers tools from small and precise mobile phone parts to as big as automotive parts. Our tools are mainly exported to U.S.A., Europe, Japan and UK. PTJMould’s diversification strategy and full service has won compliment from customers all over the world.

Our mission is to provide our customers high quality moulding products and services. We aim to exceed our customers’ expectations of pricing, quality and on-time delivery. To achieve our mission, PTJMould:

  • Commits to continually improve employee skills and efficiency,
  • Provides our employees a clean and safe working environment,
  • Upgrades machine technology and support equipment through a strict maintenance program, and
  • Maintains customers’ tooling to its highest peak of performance

For more about custom manufacturer of plastic molding products,please visit https://www.plastics-moulding.com/


Link to this article:Structural Factors to be Considered in Plastic Injection Mold Design

Reprint Statement: If there are no special instructions, all articles on this site are original. Please indicate the source for reprinting:Mold Wiki,Thanks!^^