Picture tube recycling
Under CRT Recycling means the recovery process from cathode ray tubes from televisions and computer monitors represent their glasses when properly processing a valuable commodity.
Procedure
Since picture tubes contain a large number of materials such as luminescent material , aluminum , graphite , barium and strontium in addition to glass , recycling is correspondingly expensive.
Laser cutting
The picture tube is freed from its implosion protection frame and from rubber and plastic. Next, the size of the tube is recorded by a laser and it is transported via a conveyor belt to the cutting system, where it is positioned on a turntable so that the laser can cut the tube at the seam with the glass solder (frit). Then the picture tube is divided into a screen and a cone . The cone is removed in the separating system so that only the screen comes out and the shadow mask is removed by a worker.
Heating wire separation
In this process, unlike laser cutting, the tube is manually placed in the system and fixed with two metal wedges that stretch a wire around the picture tube, which is heated so that it cuts through the glass of the tube. The cone can then simply be removed.
Saw separation
Almost everything works like laser cutting, except that the picture tube is cut with two diamond saw blades.
Stripping
The glass can only be used as a raw material after the stripping. In most cases, the two glass fractions are separated from one another, shredded and stripped by wet sliding grinding. The finished granulate can now be processed into new picture tubes, but since picture tube production has almost completely stopped, there are hardly any buyers left.
literature
- Telefunken specialist book The television picture tube , Allgemeine Elektricitäts-Gesellschaft, AEG-Telefunken. Berlin, West; Frankfurt, Main. Tubes department, Telefunken GmbH (Ulm), Telefunken GmbH publishing house, 1960
- Siegfried Behrendt, Ralf Pfitzner, Rolf Kreibich: Innovations for Sustainability: Ecological Aspects of Information and Communication Technologies , Verlag Springer DE, 1998, ISBN 3540642463 .