16
Forming Difficulties Formech FM660
PROBLEM
CAUSE
REMEDY
Creased or distorted formings
Excessive mould release
pressure or timing
Adjust to suit
Material too hot at release
Increase cooling time
Material thinning
Adjust heater zoning
Thick tops on finished
mouldings. (Chill marks)
Mould too cold causing rapid
cooling on contact
Increase mould temperature.
Adjust flow on water cooled moulds
Design of mould
Use plug tool to assist material flow
Insufficient pre-stretch
Increase pressure, flow or time
Material too hot or too cold
Increase heating time/temp.
Marks on finished mouldings
Damaged or dirty mould
Repair or clean mould. Use
blowgun between formings.
