Steam distribution
AssigneeDevron Engineering Ltd.
InventorNorman F. Dove
Life of this patent
Estimating the term…
Abstract
A steam distributor for applying steam to a paper sheet moving beneath it and spaced from the distributor. The distributor has a leading edge and a trailing edge relative to the sheet movement. There is a header for steam extending along the leading edge. At least one opening formed in the header enables steam to be directed towards the sheet. The steam so directed forms a curtain to eliminate air entrained by the sheet.
Claims13
In a steam distributor for applying steam to a web of cellulose fibers carried on a moving belt and spaced from the distributor, the distributor having a leading edge and a trailing edge relative to the belt movement, the improvement comprising:
- a header for steam extending along said leading edge;
- means for supplying said header with steam;
- means defining a first row of spaced outlets for said steam arranged longitudinally on said header;
- means defining a second row of spaced outlets for said steam arranged longitudinally on said header;
- means defining a third row of spaced outlets for said steam arranged longitudinally on said header;
- each of said means defining said rows being such that the spaced outlets in each row are staggered relative to the spaced outlets in the neighbouring row;
- and
- said header located on said distributor and positioned with respect to said web such that steam flowing out of said first, second and third rows of outlets is directed downwardly towards said belt at 90.degree. to or against the direction of movement of the belt at the leading edge of the distributor and precludes air carried by said web from flowing past said header.
A steam distributor for applying steam to a paper web travelling beneath it and spaced beneath the distributor, the distributor having a leading edge and a trailing edge relative to the paper web movement,
- means to supply steam to the steam distributor;
- outlets in the distributor so that the steam may be directed downwardly onto the paper web;
- a first header for steam extending along the leading edge of the distributor;
- means defining a first row of spaced outlets for said steam arranged longitudinally on said header;
- means defining a second row of spaced outlets for said steam arranged longitudinally on said header;
- means defining a third row of spaced outlets for said steam arranged longitudinally on said header;
- each said means defining said rows being such that the spaced outlets in each row are staggered relative to the spaced outlets in the neighbouring row;
- said first header located on said distributor and positioned with respect to said web such that steam flowing out of said first, second and third rows of outlets is directed downwardly towards said belt and against the direction of movement of the belt at the leading edge of the distributor and precludes air carried by said web from flowing past said first header;
- a second header for steam extending along said trailing edge of the steam distributor;
- means defining a first row of spaced outlets arranged longitudinally on said second header;
- means defining a second row of spaced outlets arranged longitudinally on said second header;
- means defining a third row of spaced outlets arranged longitudinally on said second header;
- each of said means defining said rows in said second header being such that the spaced outlets in each row are staggered relative to the spaced outlets in the neighbouring row;
- and
- said second header located on said distributor and positioned with respect to said web such that steam flowing out of said first, second and third rows of outlets is directed downwardly towards said belt and against the direction of movement of the belt at the trailing edge of the distributor so as to maintain said steam within the steam distributor.
In a method of applying steam to a paper sheet from a steam distributor positioned above and spaced from the sheet, the distributor having a leading edge spaced from the sheet and a trailing edge spaced from the sheet relative to the movement of the paper sheet, the improvement that comprises directing steam downwardly from the leading edge of the distributor in the form of a steam curtain to prevent air from being conveyed into the distributor by the paper sheet.
In a method of applying steam to a paper sheet from a steam distributor positioned above and spaced from the sheet the distributor having a leading edge spaced above the sheet and a trailing edge spaced above the sheet relative to the movement of the paper sheet, the improvement that comprises directing steam downwardly from the leading edge of the distributor from a plurality of openings arranged in a plurality of rows, the arrangement being such that the steam presents a solid curtain to prevent air from being conveyed into the distributor by the paper sheet.
Dependencies are inferred from the claim text.