Apparatus for perforating webs of wrapping material for rod-shap

Details Apparatus for perforating webs of wrapping material for rod-shap Apparatus for perforating webs of wrapping material for rod-shap

1979-01-15

1981-01-27

Mayewsky, Volodymyr Y.

Electric heating

Heating devices

Electric arc-type devices

131 15B, H05B 718

Patent

active

042477549

ABSTRACT:
Apparatus for making holes in a running web of wrapping material for cigarettes or in a running web of uniting band material which connects filter plugs with plain cigarettes has one or more groups of series-connected electrode pairs whose electrodes are disposed at the opposite sides of the web. Several sources of high-voltage impulses transmit impulses seriatim to one electrode of the foremost electrode pair of each group whereby the resulting spark discharge across the gaps between the electrodes of each pair entails the formation of holes. The size and/or the number of holes can be varied in order to ensure that the permeability of each unit length of the web will equal or approximate a selected value, by changing the frequency of application of high-voltage impulses or by changing the number of series-connected electrode pairs. The polarity of impulses is reversed, either regularly or at random intervals, in order to remove scraps of paper which accumulate at the tips of the electrodes. The electrode pairs of each group are staggered, as considered transversely and/or in the longitudinal direction of the web.

REFERENCES:
patent: 2372508 (1945-03-01), Meaker
patent: 3475591 (1969-10-01), Fujii et al.
patent: 3622751 (1971-11-01), Larive

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