Ambient Temperature

[Alden86]

Does anyone know how much of an impact the room temperature or environment has on the process parameters. Using TPU material and a closed conveying system (such as Motan) or has anyone ever noticed a difference in the properties by the seasons?

[brentb]

Are you drying the resin? I know you mention Motan. If you dry correctly and use a closed system, then the answer should be NO!

KOM

brent

KOM

[Josue]

I have an issue, maybe not same as yours , but I ran a mold with PBT,,, if we keep the parts on the molding room (30C) the parts keep shrinking until 5 days,, 0.05mm

but if we send the parts to the ware house , (35-38C),, the parts shrink a lot immediately,,, we have a night mare with this , I know that the mold design its not the best and gates are contributing to increase the stress in the parts , but we have this diference with the room temperatures

regards

[JayDub]

I have an issue, maybe not same as yours , but I ran a mold with PBT,,, if we keep the parts on the molding room (30C) the parts keep shrinking until 5 days,, 0.05mm

but if we send the parts to the ware house , (35-38C),, the parts shrink a lot immediately,,, we have a night mare with this , I know that the mold design its not the best and gates are contributing to increase the stress in the parts , but we have this diference with the room temperatures

regards

Josue -

If you can ... Open up the gates, pack the parts hard (high pressure), and if you have an oven, try annealing at 50 or 60 C (or look up resin suppliers recommendations). The parts will shrink when you anneal them but should be more stable afterwards.

[Josue]

Josue -

If you can ... Open up the gates, pack the parts hard (high pressure), and if you have an oven, try annealing at 50 or 60 C (or look up resin suppliers recommendations). The parts will shrink when you anneal them but should be more stable afterwards.


Jay
thanks for your advice