Powder applicator device, particularly for cigarette making machines
AssigneeMolins Limited
InventorsAlan M. Aindow, Michael J. Cahill, John Dawson, James R. Stembridge
Life of this patent
Estimating the term…
Abstract
A device for applying bronze or similar powder, particularly in a cigarette making machine, uses a corona discharge wire (36) or similar conductor maintained at high voltage to establish an electrostatic field which causes powder to be attracted to prepared adhesive patches on a paper web (14). Excess powder carried by the web is removed with the assistance of vibration, which may be produced by passing the web over an ultrasound device (44) or a pulsed air mover (102). Excess powder may also be removed by an air mover (152) directing a stream of air at the surface of the web carrying the powder.
Claims18
A device for applying powder to a moving paper web, comprising means for providing prepared regions at predetermined positions on a surface of said web, said prepared regions being capable of retaining powder on the web at said predetermined position;
- means defining a path for the web;
- means for supplying powder to a location adjacent said path;
- means for establishing an electrostatic field in a region including said location so that powder is attracted to said surface of the web;
- and means including an ultrasonic device for removing excess powder from the web, said path defining means being arranged so that said web is entrained over a part of said ultrasonic device so as to contact said part with the surface of said web opposite the surface on which said prepared regions are provided, said part of said ultrasonic device including an edge over which the web is entrained and at which said path changes direction, whereby excess powder is removed from said web by or with the assistance of ultrasonic vibration transmitted to said web by said ultrasonic device, so that powder remains on the web substantially only in said predetermined positions.
A device for applying powder to a moving paper web, comprising means for providing prepared regions at predetermined positions on a surface of said web, said prepared regions being capable of retaining powder on the web at said predetermined position;
- means defining a path for the web;
- means for supplying powder to a location adjacent said path so that powder is applied to said surface of the web;
- and means including an ultrasonic device for removing excess powder from the web by or with the assistance of ultrasound, said path defining means being arranged so that said web is entrained over a part of said ultrasonic device so as to contact said part with the surface of said web opposite the surface on which said prepared regions are provided, said part of said ultrasonic device including an edge over which the web is entrained and at which said path changes direction, whereby excess powder is removed from said web by or with the assistance of ultrasonic vibration transmitted to said web by said ultrasonic device, so that powder remains on the web substantially only in said predetermined positions.
Dependencies are inferred from the claim text.