(1) Hot runner mold
With the help of the heating device, the plastic in the pouring system will not solidify and will not be demolded with the product, so it is also called a runnerless mold. Advantages: 1) No waste 2) Can reduce the injection pressure, can use multi-cavity mold 3) Can shorten the molding cycle 4) Improve the quality of products. Features suitable for hot runner molding plastic: 5) The melting temperature range of the plastic is wider. At low temperature, it has good fluidity and at high temperature, it has better thermal stability. 6) Sensitive to pressure, no flow without pressure, but can flow when pressure is applied. 7) Good specific heat, so as to cool down quickly in the mold. The available hot runner plastics are PE, ABS, POM, PC, HIPS, PS. There are two commonly used hot runners: 1) heated runner mold 2) adiabatic runner mold.
(2) Hard mold
The steel plates used in the inner mold parts need to be heat treated after being purchased, such as quenching and carburizing, to meet the requirements of use. Such injection molds are called hard molds. For example, the inner mold parts are made of H13 steel, 420 steel, and S7 steel
(3) Soft mold (below 44HRC)
The steel used in the inner mold part does not need to be heat treated after being bought back, and it can meet the requirements of use. Such injection molding is called soft mold. For example, the inner mold uses P20 steel, Ace steel, 420 steel, NAK80, aluminum, and beryllium copper.
