Device for regulating the width of a film surface on a paper web

摘要

The device comprises a fixed scraping member (3) to rub against a transfer drum (2) of the surface film and to define the maximum (Lmax) width of the film to be deposited, and a movable scraping body (11, 12) to move along a first direction normal to the surface of the transfer drum and to a direction parallel to a generator for transferring the drum. The device is intended to connect with the drum for transferring the film on the paper strip. The movable scraping member connects with an automated shifting mechanism (13) to adjust the width (L) of the surface film on the transfer drum. The device comprises a fixed scraping member (3) to rub against a transfer drum (2) of the surface film and to define the maximum (Lmax) width of the film to be deposited, and a movable scraping body (11, 12) to move along a first direction normal to the surface of the transfer drum and to a direction parallel to a generator for transferring the drum. The device is intended to connect with the drum for transferring the film on the paper strip. The movable scraping member connects with an automated shifting mechanism (13) to adjust the width (L) of the surface film on the transfer drum between a minimum value (Lmin) and maximum value(Lmax) determined by the fixed scraping body. The automated shifting mechanism comprises a carriage (15) for rotating movable scraping member in a direction parallel to a generator of the transfer drum and a unit for tilting the movable scraping body on the transfer drum. The rotating carriage comprises a cart for supporting movable scraping member and a motor for shifting the cart rotating along a direction parallel to a generator of the transfer drum provided using a guiding unit. The carriage is made of screw-nut and the support cart is fixed by a nut connecting with a threaded axis rotated by the motor. The tilting unit comprises a cylinder. The movable scraping member and the fixed scraping member are vertically spaced with respect to each other. The automated shifting mechanism allows a partial superposition of the movable scraping member with fixed scraping member. The fixed and movable scraping members each comprises a friction doctor blade on the drum, and a cup for recovering of scraped surface film on the drum. The cup for recovery is laid under the friction blade for recovering the surface film flowing under gravity under the plate after scraping of the surface of the transferring drum. An independent claim is included for a system for application of a surface film on a paper strip.