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  Plastic processing forums for extrusion information and advice and for other feed screw applications.
  Extrusion, Twin Screw
  thickness automation

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Author Topic:   thickness automation

Posts: 2
Registered: May 2003

posted May 16, 2003 08:36 AM     Click Here to See the Profile for goulmik   Click Here to Email goulmik     Edit/Delete Message   Reply w/Quote

I work on a twin screw extruder to produce a film of 600m.
I'd like to know if there is a system that is able to read the film's thickness and then to act on the die to maintain automagically the thickness of the film.


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Posts: 147
From:McHenry, IL USA
Registered: Nov 2002

posted May 17, 2003 07:45 AM     Click Here to See the Profile for zabielski   Click Here to Email zabielski     Edit/Delete Message   Reply w/Quote
Yes, there are such feed back systems, and I'd suggest you contact NDC, MEASUREX, and OHMART (now owned by MEASUREX) as a start.

From many year of working with such vendors, and looking at the ease of use, the NDC system will give you the biggest bang for your buck. The MEASUREX system is so complicated that you'll need a dedicated Engineer to constantly calibrate it (and repair it). The OHMART line was purchased so that MEASUREX could offer a lower priced system.

The key is to input the correct density of you film, and selecting the right area for the insatntaneous feed back loop. It is though, more expensive for a feed back loop, so you ought to weight these added costs.

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