Six Systems of Plastic Mould

The functional structure of plastic mould system is mainly composed of six systems: pouring system, temperature regulating system, forming parts system, exhaust system, guiding system and ejection system. The pouring system and forming parts are the parts directly contacted with plastics, and change with plastics and products. They are the most complex and most changeable parts in plastic mould. It is required to process the parts with the highest smoothness and accuracy.


  1. Gating system:

The pouring system refers to the runner part of the plastic before it enters the cavity from the nozzle, including the main runner, the cold material hole, the shunt runner and the gate, etc.


  1. Molding parts system:

The forming part system refers to the combination of various parts which constitute the shape of the product, including the movable die, the fixed die, the cavity (concave die), the core (punch), the forming rod and so on. The core forms the inner surface of the product, and the cavity (die) forms the outer surface shape of the product. After closing, the core and cavity form the cavity of the die. According to the process and manufacturing requirements, sometimes the core and die are composed of several pieces, sometimes they are made into a whole. Inserts are used only in the parts that are easy to be damaged and difficult to be machined.


  1. Temperature control system:

Temperature control system is to meet the requirement of injection process for mould temperature. Temperature control system is needed to adjust the temperature of the mould. For injection moulds for thermoplastics, cooling systems are mainly designed to cool the moulds (or to heat the moulds). The common method of mould cooling is to set up cooling water passage in the mould and use circulating cooling water to take away the heat of the mould; besides using cooling water to pass hot water or hot oil, the heating of the mould can also install electric heating elements inside and around the mould.


  1. Exhaust system:

The exhaust system is set up to exclude the air in the cavity and the gas produced by the melting of plastic into the outside of the mould during the injection moulding process. When the exhaust is not smooth, the surface of the product will form bad gas marks (gas lines), burning and so on. The exhaust system of the plastic mould is usually a groove-shaped air outlet opened in the mould to discharge the original type. The air in the chamber and the gas brought in by the melt.



When the melt is injected into the cavity, the air in the cavity and the gas brought in by the melt must be discharged out of the die through the exhaust port at the end of the material flow. Otherwise, the product will have air holes, poor connection, unsatisfactory filling, and even the accumulated air will burn the product due to high temperature caused by compression. In general, the exhaust holes can be located at the end of the melt flow in the cavity or on the parting surface of the plastic mould.

The latter is a shallow groove with a depth of 0.03-0.2 mm and a width of 1.5-6 mm on the side of the die. During the injection, the exhaust holes will not have a lot of melt seepage, because the melt will cool and solidify there and block the passage. The opening position of the exhaust outlet should not be directed at the operator in order to prevent accidental ejection of molten material from hurting people. In addition, the matching clearance between ejector rod and ejector hole, and the matching clearance between ejector block and ejector template and core can also be used to exhaust gas.


5, Guidance system:

The guiding system is set up to ensure that the moving and fixing die can be accurately aligned in the die. The guiding parts must be set up in the die. In injection moulds, four groups of guide pillars and guide bushes are usually used to form guide parts. Sometimes, the internal and external cones which coincide with each other are set on the dynamic and fixed moulds to assist in positioning.


  1. Ejection system:

Ejection system generally includes: ejection pin, front and rear ejection pin plate, ejection pin guide rod, ejection pin reset spring, ejection pin plate locking screw and other parts. When the product is cooled in the mould, the front and rear die of the mould are separated and opened, and the plastic product and its condensate in the runner are pushed out or pulled out by the ejector pin driven by the ejector rod of the injection machine, so as to carry out the next injection molding working cycle.


JasonMould Industrial Company Limited, established in 2010, is a leading plastic injection molding manufacturer in China. JasonMould 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, JasonMould 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. JasonMould’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, JasonMould:

  • 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

Inquiry Contact:

Contact person: James Yuan

Company name: JasonMould Industrial Company Limited

Address: LongGang Village,LongXi Town,BoLuo County,HuiZhou City,GuangDong Province, China

Telephone: 86-752-6682869

Email: [email protected]


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