Injection Molding Touble Shooting Problems Water Mark Streak Flash Weld Line Poor Surface Unfilled Burn Color Problem Deform Thick Crack Possible Reason Low Barrel Temp ● ● ● ● ● ● High Barrel Temp ● ● ● ● ● High Injection Pressure ● ● ● Low Injection Pressure ● ● ● ● Short Packing Time ● Long Packing Time ●…
Surface Ra of different plastic molding material Ra index arrange μm 0.012 0.025 0.05 0.1 0.2 0.4 0.8 1.6 3.2 6.3 12.5 25 inject Thermoplastics PMMA 0.025 0.05 0.1 0.2 0.4 0.8 1.6 ABS 0.025 0.05 0.1 0.2 0.4 0.8 1.6 AS 0.025…
Sliders :after plasticmold open,the cam and sliders have the relative movement trend, which trend makes the slider has 2 movement directions , opening direction and the horizontal direction .then the undercut could be released from the mold. figure Suitable for thin mold plate and upper fixed plate screwed with the A plate with longer march surface , better stability Suitable for thick mold plate , the big mold space,two-plate mold and three plate mold Matching surface L≧1.5D(D cam diameter ) better stability Suitable for thick mold plate , two-plate mold and three plate mold， mating surfaces L≧1.5D(D cam diameter ) Poor stability,hard machining.…
While the use of standard parts in mold tools has many advantages, it can take a long time to incorporate them in to mold tool designs as a. great deal of information has to be looked up in the catalogues.…
A gate is a small opening (or orifice) through which the poly melt enters the cavity. Gate design for a particular application includes selection of the gate type, dimensions and location. The gate design is largely determined by: The part…
Runners must be designed to fill the cavity rapidly, routine design must provide for easily ejection and easy removal (de-gating) from the molded part. For multi cavity system, balanced runner layout is practical for the best uniformity and part quality.…
The purpose of the runner is to transport the melt from the sprue to the gates. There are three basic parameters for runner geometry: The cross-sectional shape The diameter The cavity layout The most efficient runner section is the full…
Cold Slug Well-This is designed to trap the cooler advancing front of the melt、thus permitting hotter melt to reach the cavities and gates. It usually has a snatch or pull pin or sucker pin underneath it to positively pull the…
All mold tools are expensive and easily prone to damage and corrosion if they are not maintained properly. In most injection molding shops, the mold storage area often houses a considerable capital investment, often running into millions of pounds. Before…
Mould Finishing-Nearly all cavity and punch forms require a Finish to be applied to them. This may be a Polished finish, a photo-etched finish or a plated finish. However, for some technical Components the surface finish is not important and…