Surface sinks in small polyurethane (TPU) washer
Surface sinks in small polyurethane (TPU) washer
(OP)
First time user of a C60A10W polyurathane. Parts are
three sizes .38, .25 & .18 dia. x .05 thick. Surface
must flate an free of sinks. These are vacum seals.
Processor has try a range of injection speeds & pressures
and temps suggested by supplier.
three sizes .38, .25 & .18 dia. x .05 thick. Surface
must flate an free of sinks. These are vacum seals.
Processor has try a range of injection speeds & pressures
and temps suggested by supplier.






RE: Surface sinks in small polyurethane (TPU) washer
Tool venting?
Too much shear heat being put into material (e.g too high back pressure/too high screw surface speed?)
Rgds
Harry
RE: Surface sinks in small polyurethane (TPU) washer
More injection pressure
More hold up pressure
More hold up time
larger gates, runners, sprues etc
Is the ring check valve sealing
Is there enough injection stroke to reliably close the ring check
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Surface sinks in small polyurethane (TPU) washer