I want to tell you something about condition for injection and molding, the large molecular structure of polymer and the features of molecular thermodynamic movement have determined that polymer has such states of aggregation as the glassy state, highly-elastic as well as viscous flow state etc. […]
Rust prevention for the slot or channel should be taken into account, structure of the slot and channel should be designed for the convenience of cleaning. […]
cooling at the gate part should be intensified, for cooling only, avoid setting the medium channel at the welding mark of the plastic parts, whereas the heating of medium channel should be preferably near the welding mark. […]
the cores and cavity molds should be separately controlled, generally, cavity molds absorb more heat and contain large heat radiating area, and therefore, require stronger control than cores. […]
distance from the medium channel to cavity surface should be as equal as possible. […]
generally, it is more effective to heat or cool slender slots of large quantity than large-sized slots, which expands the range for mold temperature control. […]
on the other hand, in order to remove such defect as the welding mark and to produce plastic parts with high lucency, dielectric such as high temperature and high pressure steam, high pressure hot water or thermal conducting oil should be applied to the molds to raise surface temperature molds. […]
the hot and cold medium channel of molds is usually in hole or slot form, […]
actually, there is the third kind of the electrical heating method—heating with electric ring, wind the flat resistance wire around the mica and put the part into a tailor-made metal shell, […]
I want to show another type of the electrical heating method–direct heating with resistance wire, select sound resistance wires, insert them into insulated a porcelain tube, […]