Basic knowledge of the plastic moulds and technology

applications
Hot runner system, also called hot runner system, mainly composed of hot runner, hot water but, temperature control box. Our common hot runner system there is a single point of hot runner and hot runner 2 more forms. Single point gate is to use a single hot runner of the molten plastic toys into the cavity directly, it is a single cavity of a single gate of plastic mold; Multipoint hot runner by hot water but the molten material branch to various points in the hot runner set into the cavity, it is suitable for single cavity more into the material or multi-cavity mold.
Pieces of hot runner system advantage
(1) the material floolwing, don't need after processing, the whole forming process is fully automated, save the working time, improve work efficiency.
(2) the pressure loss is small. Hot runner temperature and the temperature of the plastic injection machine nozzle is equal, to avoid the surface of the material in the runner, condensate loss in injection pressure.
(3) material floolwing repeated use can make plastic performance degradation, and the use of hot runner system is not shuikou expected, can reduce the loss of raw materials, thereby reducing the product cost. Uniform temperature and pressure in the cavity, plastic stress is small, uniform density, in smaller injection pressure, the shorter the forming time, injection molding injection system is better than the general products. For Outdoor fitness equipment, thin pieces, large plastic parts or high demand parts can show its advantage more, and with small models produce larger products.
(4) hot nozzle adopt standardization, seriation design, equipped with a variety of selection of the nozzle head, good interchangeability. Unique design and processing of electric heating circle, can achieve uniform heating temperature, long service life. Hot runner system is equipped with heat flow but, thermostat, etc., the design is exquisite, species diversity, use convenient, stable and reliable quality.
Pieces of hot runner system application deficiency
(1) the whole mould height increasing, by adding hot water but, mold the overall height increase.
(2) the thermal radiation is hard to control, is the biggest trouble of hot runner gating heat loss, is a major issue to solve.
(3) thermal expansion, heat bilges cold shrink is to consider when we design problem.
(4) the mold manufacturing costs have gone up, hot runner system standard accessories price is higher, affect the popularity of hot runner mold.