PP homopolymer with a fractional % HDPE gives properties similar to PP Copolymer (crack resistance) You must try your resin combos in sampling and do dart/drop tests to determine what you want...
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PP homopolymer with a fractional % HDPE gives properties similar to PP Copolymer (crack resistance) You must try your resin combos in sampling and do dart/drop tests to determine what you want...
Any colorant involved?
KOM brent
Universal set-up sheets are useful (in my opinion) for transferring tools from press to press. Often a specific set-up sheet is also used for each particular press,showing positions,temps,velocities,...
Mix PE and PP homopolymer to hope for copolymer characteristics. Consult your resin supplier for proper PP grade.
KOM
brent
What process do you use?
KOM
brent
Original query concerned plant water piping.
KOM
brent
Plastic (CPVC) doesn't rust or corrode!
KOM
brent
Do you have "clamp Decompress" feature on press?
Are you using it?
If not try it!
KOM
brent
YES!
KOM
brent
Suspect over-packing!
KOM
brent
Yes, heat bands, they go out a lot!
Spray, for trip and place desiccant bags in mold, and there is a wrap against moisture, kind of like a TYVEK, that many molders use to prevent moisture damage,...
Questions:
Resin being used?
Cycle time?
PM Schedule?
Care given during run(mold protection etc)
Multi cavity hi speed molds like closures of 32 cavity + sometimes have 10 to 25% spare...
I know a guy that made one with a gas grill, small 5 gallon tank, and a modulating valve, no pump other than central system. It worked!
KOM
brent
If I ever saw a process with ZERO cushion variation out to 3 decimal places, I'd suspect alien (ET Type) intervention?
KOM
brent
What's the problem?
Are you making a mountain out of a mole hill?
KOM
brent
Contact: HFA (Harvard Factory Automation) or MAC (Molding Automation Concepts)
KOM
brent
DynaPurge E and E2
KOM
brent
We worried about the same thing in the Service!
KOM
brent
Enlighten us on the "obvious reasons" please! Imagine lead in a BECU mold component?
KOM
brent
Try solder instead of AL!
KOM
brent
Nylon should be consistently dried.
KOM
brent
What"Buttons"?
Can't find someone capable of pushing a button? Hire a temp or student for a day or get the IT guy to "push a button"!
KOM
brent
Those controls were known to go randomly "brain dead". I never heard of a permanent fix. There are companies that specialize in retrofitting a new (usually BC) control unit.
Van Dorn came out with...
Test your mixed/contamination theory by mixing some and observing
Could you have a barrel zone overheating
KOM
brent
Try these people:
https://www.controlrepair.com/
KOM
brent