Have you checked your die and parison for burrs or nicks?
Is the material sticking to the die? Are you using a coating on the die and parison?
Is your breaker plate fine enough to trap unmelted particles?
What I have seen in industry is to check fit and function; Plastic parts are usually out of round, not flat, etc.
The best way to handle this is to determine what the most variable dimensions are on the part that is easy to inspect. Usually the longest length and largest diameter. Use these...
It is always best to avoid anything that can contaminate the material. Operators add it in varying amounts creating bad knit lines, etc.
The best way to fix the problem is to fix what is wrong with part or mold design so that the parts don’t stick. Sticking is usually a correctable condition...
Hello Hercules
Yes a process that may work for you of injection blow molding assuming the wall sections do not have very tight tolerances.
With air injection molding and water inject assisted molding, you fill the mold part way by injecting plastic in the mold, then an air or water valve opens...
If the part is clear and unfilled, you can view the part by placing it between 2 polorizing filters ( You can purchase polerized plastic sheet, Get the linear polorized ones) to see how it works you can use 2 camera lens polorizers.Put a light source behind the farthest polorizer. Rotate one of...
Hello Insertexpert.
I am not exacly sure of your design from the description.
Can the metal plastic have small tapered holes through the plastic?
If it can, you can add tapered pins that support and locate the block during the molding process.
You can use a retactable core, or cores. You...
If you have enough of a budget you can probably have the material extruded with the faces 300MM apart and have the internal ribbing to support the wall section as part of the extrusion. This way you have no fastners of external protrusions.
Hope this helps
A few simple suggestions, The gear cutters have been known to leave radii off the gear form cutters. Look at the minor diameter of the gears and see if you have sharp edges (their should be a radius).
Possibly a bad lot of steel? Have they changed their supplier.
Are gear teeth overly hardened...
Just a few quick observations.
1. Parts with a "C" cross section are very difficult to mold and hold tight tolerances. The issue is that depending on where the gate is located the slot will either open up or close down. If the baffel is molded in place, the bore will be a different diameter...
