Nozzle overflow, also known as flashing, overflowing ed […]
Nozzle overflow, also known as flashing, overflowing edge, piping, etc., mostly occurs at the opening and closing position of the mold. Such as: the parting surface of the Shandong injection molding machine mold, the sliding parts of the slider, the gap of the insert, the hole of the ejector. If the flash material is not resolved in time, it will be further enlarged, which will cause the local collapse of the stamping mold, causing permanent damage. The overflow of the gap between the insert and the ejector pin will also cause the product to jam on the mold and affect the demolding.
In terms of equipment (1) The true clamping force of the machine is insufficient. When selecting an injection molding machine, the rated clamping force of the machine must be higher than the tension formed by the longitudinal projection area of the injection molded product during injection, otherwise it will cause the mold to expand and flash.
(2) The clamping device is poorly adjusted, the toggle lever mechanism is not straightened, or the mold is not balanced, left or right, or up and down, and the mold parallelism cannot be achieved, which causes one side of the mold to be tightly closed and the other side not close A flash will appear during the injection.
(3) The parallelism of the mold itself is not good, or it is not installed in parallel, or the template is not parallel, or the force distribution of the tie rods is uneven, and the deformation is uneven, all of which will cause the mold to close tightly and cause flash.
(4) Severe wear of check loops, failure of spring nozzle springs, excessive wear of barrels or screws, failure of the cooling system at the inlet caused a "bridge" phenomenon, insufficient injection volume adjusted by the barrel, too small cushions, etc. Both can cause flashing to occur repeatedly and must be repaired or replaced in a timely manner.