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3. Material feed
Today, all sheet or plate lines are coextrusion lines, because the sheets or plates are structured in 3 layers of type A-B-A or A-B-C: three extruders are needed in case A-B-C, two may suffice in case A-B-A.
The central layer B is generally made up of a mixture of virgin material and crushed material consisting of the edges crushed in line and the scraps from a previous production run.
In the case of in-line thermoforming, layer B can even be made exclusively of ground material, from the thermoforming "skeletons" that are recycled in-line.
It's rare for outer layers A and C to be made of just one material: applications generally call for blends of 3 materials, two polymers of different grades and a masterbatch for coloring.
All these materials are usually granules, rarely powders or beads....
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Material feed
Extrusion
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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