Cleaning apparatus for rolls
AssigneeValmet Corporation
InventorsVesa Ahvenniemi, Teuvo Lappalainen
Life of this patent
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Abstract
A method and apparatus for cleaning the surface of a backing roll in a coater or a calender roll. The roll is cleaned by injecting steam from a steam injection chamber against the roll surface at a 15.degree. angle counter to the rotational direction of the roll. Steam impinging on the surface performs effective removal of accumulated dirt and the detached dirt is carried away on the web without a deleterious effect on the quality of the web. Steam injected against the roll is vacuumed away from the roll surface via a suction chamber, whereby the cleaning steam is prevented from escaping to the surroundings.
Claims9
An apparatus for cleaning the surface of a rotatable roll, comprising:
- a plurality of adjacent steam chambers;
- means for supplying steam to the steam chambers;
- means for applying steam to the roll to be cleaned, said steam applying means including a steam injection chamber situated between a last of the adjacent steam chambers relative to the rotational direction of the roll being cleaned and a steam chamber next to said last steam chamber, said steam injection chamber having an exit which faces the roll for applying steam to the roll being cleaned;
- and
- steam channels arranged so as to direct steam into each of the adjacent steam chambers so that said adjacent steam chambers are heated.
Dependencies are inferred from the claim text.