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Author
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Topic: looking for in line film thickness control device
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zarko
Senior Member Posts: 5
From:Bulgaria
Registered: Nov 2004
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posted March 03, 2005 01:01 PM
   
i am looking for in line film thickness control device for HDPE and LDPE film. Any advices and approximate prices?IP: Logged |
Bob Cunningham
Senior Member Posts: 103
From:Amesbury, Mass
Registered: Nov 2002
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posted March 04, 2005 07:42 AM
Are you looking to control the average thickness, or the thickness profile?-Bob Cunningham IP: Logged |
zarko
Senior Member Posts: 5
From:Bulgaria
Registered: Nov 2004
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posted March 17, 2005 02:26 PM
Hi, Bob. The average thickness. A layflat measuring system would be perfect in my opinion? IP: Logged |
Bob Cunningham
Senior Member Posts: 103
From:Amesbury, Mass
Registered: Nov 2002
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posted March 21, 2005 08:17 AM
There are two approaches to this- you can either control extruder speed or nip speed. I recommend that you control nip speed, so that film properties are kept consistent.If you are looking to only control average thickness, you can either use a gauge on the bubble (such as a Kundig oscillating capacitance gauge) or a layflat gauge (such as a nuclear or IR gauge from NDC/Infrared Engineering). If you have a rotating die, then either gauge may miss out on some "tower" effects- an oscillating hauloff combined with a layflat gauge will give you the most accurate picture (but is also a very expensive arrangement). I would recommend that you contact either NDC or Kundig (or pehaps another gauge manufacturer if you are familiar with them) for a discussion of your particular application. My company can incorporate this control into a complete line control package, but quite honestly it is too complicated/sophistocated (read: expensive) for this type of project. If you want contact information for NDC or Kundig, let me know and I will post their websites. -Bob Cunningham IP: Logged |
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