Roll cleaning apparatus
AssigneeValmet Corporation
InventorsTeuvo Lappalainen, deceased, Timo Vuorimies
Life of this patent
Estimating the term…
Abstract
An apparatus for cleaning the surface of a backing roll in a coater or a calender roll, wherein the roll is cleaned by spraying water on it and then scraping the water away from the surface or the roll with a doctor blade. Splashing of the water accumulating in front of the doctor blade is prevented by a rubber sheet extending down close to the tip of the blade, or alternatively, using a guide blade mounted in front of the doctor blade. The rubber sheet preceding the doctor blade isolates the water pond formed in front of the doctor blade from the surface of the roll, so that the rotational movement of the roll cannot induce turbulence and splashes.
Claims11
An apparatus for cleaning a roll surface, comprising:
- a blade holder;
- a doctor blade attached to the b lade holder;
- a means for adjustably pressing the doctor blade against the surface of the roll to be cleaned;
- a water feeding means, arranged in front of the doctor blade relative to a rotational direction of the roll, for feeding washing water to the surface of the roll;
- and
- a flow control means for forming an edge close to a point where the roll contacts the doctor blade, said edge extending over an entire length of the doctor blade, said edge being arranged and adapted to control a flow of water hitting the doctor blade whereby water back flow is guided away from the surface of the roll to effectively prevent the back flow of washing water onto the surface of the roll.
Dependencies are inferred from the claim text.