What is an unbalanced runner? Unlike a balanced runner design, an unbalanced runner design is that the runner lengths from the spure to each cavity may be different. And the gate has different sizes,the length of the gate near the spure should be greater than the one away from the spure, or the sectional area [...]
what is a balanced runner? The balanced runner is that all runners have identical length, shape, and sectional dimensions, from the spure to each cavity. […]
various runner designs can be found in a multi-cavity mold, runner layout is designed for the mold cavities and thus depends on the cavity layout, the basic types of layouts for runners and cavities are balanced and unbalanced.
during mold opening, the well can pull the slug off the spure bush. […]
what is the function of cold-slug? It’s purpose is to store cold slug created intermittently by the nozzle due to heat loss and low temperature. Cold slugs could clog or slow down the material flow in runner and cavity and cause cold scars or cold marks on plastic part.
please don’t forget cold-slug, it well usually locates at the end of the spure. That is, at the end of the runner and on the core-retainer plate, on directly opposite side of the spure.
but how to design a spure bush, I have some principles in the followin: […]
when a sprue allows the melt plastic material to flow into the cavity, that is called direct gate, in that case, the plastic part will be left with a trace by the sprue. […]
we have discussed too much about the feed system of a injection mold. Today I want to say more details about feed system assembly, […]
Most mold and die shops rely on three-axis machines to do most of their milling work. Five-axis machines were not considered sturdy enough to mill hard materials used in Class 1 mold cavities. Moreover, five-axis programming was harder to learn and program. In general, these statements remain true. […]