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11. Thickness gauges
Whereas thickness checks are carried out by taking samples from the production process, thickness gauges are designed to monitor and adjust the process, enabling any deviations to be checked before they are noticed at the end of each reel.
An in-line thickness measurement system is now a standard feature of flat die extrusion.
In its simplified version, it reacts in a closed loop to the speed of either the extruder or the calender rolls, so that the calculated average thickness tends towards the target value, and informs the operator of the thickness profiles so that he can correct the distribution.
In its full version, in addition to the above functions, it assumes the role of a setter, reacting in a closed loop to the heating bolts on the die lips to optimize the thickness profile (cross direction standard deviation...
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Thickness gauges
Stacker cutter
Bibliography
Software tools
Contour TM Die (EDI)
BEMflow, Boundary Element Fluid and Heat Transfer Simulation Program
Inverted preland Die (Cloeren)
Websites
Octal
Rauwendall
The Madison Group
Verbruggen...
Standards and norms
- Management environnemental. Exigences et lignes directrices pour son utilisation. - ISO 14000 - Nov. 2004
- Food safety management systems – Requirements for all organisms in the food chain. - NF EN ISO 22000 - Oct. 2005
Directory
Manufacturers – suppliers (non-exhaustive list)
Robert Barr, Inc.
HPM
Extrusion Dies Industry, LLC
Statistical and economic data
Figure 1 compares the performance of two equivalent systems in terms of instantaneous available flow:
1 production unit, 1,300 kg/h, investment value €1.5 M ;
2 production units...
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