Screw stoped when charging PMMA 1

[morphi]

HI

During charching PMMA , the screw stops or rotats very slowly with more pressure.WHat should we do for charging PMMA softly?

Regards

 

[patprimmer]

Use correct screw profile.

Use correct temperature profile.

Use less back pressure.

Use easy flow or lubricated material.

Regards

eng-tips, by professional engineers for professional engineers
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[morphi]

Would you please guide me about "screw profile" , "easy flow ", "lubricated material" ?

Regards

 

[patprimmer]

Have you read the processing guides published by the PMMA manufacturers. The guides published by the reputable manufacturer are a wealth of knowledge.

I really am not prepared to write a novel here for free when some simple homework on you part would give you enough knowledge to at least ask reasonable questions.

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.

 

[morphi]

Thanks.

 

[Pud]

Increase feed zone (and maybe the rest) temperatures. Acrylic always "squeals" when feeding, but unless your machines have torque limits you can easily shear the screw or the check ring assembly off. Nasty. Much work and $$$!

And as Pat suggested, get yourself the manufacturer's processing guide - they are free!

Cheers

Harry