Extrusion Coating by B. H. Gregory

Author:B. H. Gregory [B. H. Gregory]
Language: eng
Format: epub
Publisher: Trafford
Published: 2008-05-27T16:00:00+00:00

Fig. 7.2.2 OXYGEN UPTAKE VERSE’S TIME

Ozone is produced when dry air is passed between two electrical discharge elements one of which is maintained at 10 kV and the other grounded. The discharge elements can comprise a series of glass and metal plates or concentric glass and metal tubes with a gap across which the high voltage is applied. By careful adjustment of this narrow gap the high voltage discharge created appears to the naked eye as a violet glow.

Ozone itself is a hazardous substance and most be treated with care. Its odour is very readily detectable and has a TLV value of 0.1 ppm. Human sensitivity to ozone varies from 0.01-0.05 ppm. To reduce health risks the equipment must be designed to operate with negative pressure to eliminate ozone leaking into the working area.

The position of the ozone applicator can be critical. The following experiments describe a series of tests to establish the optimum position for a given machine layout The basic process conditions were:

Melt temperature:

295 °C

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