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Clean nozzle and sprue bushing by making few shots; Continue purging until most of the commercial purging material is out of the hopper; Feed at least one injection capacity of the next production resin to rinse out any residuals; Start the next production with new resin
The sprue is a large-diameter channel through which plastic flows, usually around the edges of the part or along straight lines. The runner is a smaller channel from the sprue to the individual part. An analogy may be found in a water system that employs a water main (sprue) and smaller pipes (runners) to individual houses.
(A) Sprue, (B)&(C)runner and (D)gates in actual injection moulding product for toys The amount of resin required to fill the sprue, runner and cavities of a mould comprises a "shot". Trapped air in the mould can escape through air vents that are ground into the parting line of the mould, or around ejector pins and slides that are slightly ...
A sprue may refer to: Sprue (manufacturing), a feature in molding and casting molds; Coeliac disease, also known as sprue, a disease of the small intestine;
Galling is a common problem in most applications where metals slide in contact with other metals. This can happen regardless of whether the metals are the same or different. Alloys such as brass and bronze are often chosen for bearings , bushings , and other sliding applications because of their resistance to galling, as well as other forms of ...
The wax is embedded into an investment material with a sprue former – this forms a passage for molten metal to be poured through into the cylinder. The investment material must produce enough expansion to compensate for shrinkage of the metal on solidification and should be slightly porous to allow for dissipation of released gases.
A drill bushing, also known as a jig bushing, [1] is a tool used in metalworking jigs to guide cutting tools, most commonly drill bits. Other tools that are commonly used in a drill bushing include counterbores, countersinks, and reamers. They are designed to guide, position, and support the cutting tool. [2]
Tropical sprue is largely limited to within about 30 degrees north and south of the equator. Recent travel to this region is a key factor in diagnosing this disease in residents of countries outside of that geographical region. [2] Other conditions which can resemble tropical sprue need to be differentiated. [4]