vitrification temperature and viscous flow temperature
when the temperature is between vitrification temperature and viscous flow temperature, the polymer shall be under highly-elastic state, […]
vitrification temperature and molding
but when the temperature is below the vitrification temperature, the polymer is under glassy state, which is hard solid, wherein energy from the molecular thermodynamic movement is low, […]
something about condition for injection and molding
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 in a mold
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 in a mold
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 in a mold
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 in a mold
distance from the medium channel to cavity surface should be as equal as possible. […]
it is more effective to heat or cool slender slots of large quantity than large-sized slots in a mold
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. […]
some dielectric should be applied to the molds
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
the hot and cold medium channel of molds is usually in hole or slot form, […]