The effect of pressure retention is to continue to apply pressure to the molten plastic to increase the density of the plastic to compensate for shrinkage of the plastic. During the pressure maintenance process, the cavity of the Chair... moreThe effect of pressure retention is to continue to apply pressure to the molten plastic to increase the density of the plastic to compensate for shrinkage of the plastic. During the pressure maintenance process, the cavity of the Chair Mould(FURNITUREMOULD) https://www.furnituremould.com/product/chair-table-stool-mould/
is filled with plastic, and its back pressure is high. During the compaction process, the screw of the injection moulding machine can only move slowly forward, and the flow rate of the plastic is relatively slow. This is called pressure flow. During the holding period, the chair mould wall is cooled and solidified, and the melt viscosity is rapidly increased. Therefore, the resistance of the cavity is very large. At the later stage of the holding pressure, the density of the material is continuously increased and the plastic parts are gradually completed. Maintain the pressure on the chair mould until the gate is sealed.
During holding, local compression of the plastic part can be... less
