Here's where the sprue puller comes in: It must also function as a cold well to trap and retain the solidified or semi-solidified material in the machine-nozzle tip.
If the sprue puller does not catch and retain the material, a flow imbalance to the other cavities can occur.
Because the volume of the sprue puller should have a direct correlation to the amount of solidified and semi-solidified material in the machine nozzle tip.
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The leader pins, sprue puller
pin, stop pins, and return pins are configured and positioned on the mold according to information from the vendor.
Also, more "aggressive" sprue puller
pins are sometimes required in order to increase the pulling force.
A sprue puller is one of many design requirements for most two-plate, cold-runner molds in order for it to run fully automatic.
If you have a straight-sided sprue puller (or any straightsided boss on a runner or a part), use an ejector pin that is slightly smaller than the diameter of the puller (Fig.
The same is true for the intersection of the sprue puller and the runner, regardless whether the runner is a full-round or a parabolic design machined into either the A or B plate.
He says the sprue-sticking problem recently was overcome with a sprue-break stage in molding and a specially designed sprue puller
on his presses.
This didn't make any sense, so we covered all our bases by checking the sprue pullers
, carriage alignment, and nozzle-tip orifice.