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US 4,225,384 AGranted
Method of operating a paper machine, particularly a press section thereof
AssigneeOy Wilh. Schauman Ab
InventorPaavo J. Valkama
Life of this patent
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AssigneeOy Wilh. Schauman Ab
InventorPaavo J. Valkama
Estimating the term…
A method of manufacturing paper, cardboard, or another equivalent fiber web having a certain stretchability and/or a high coefficient of friction includes the steps of shortening or upsetting a paper web just prior to conveying the latter to a press section while adhering the web at the press section to a fabric in the form of a suitable felt or wire which is common to successive press nips of the press section for conveying the web to the successive press nips, these press nips including first and second press nips where the web is engaged by an additional endless fabric structure in the form of suitable felt or wire so that at least at the first and second press nips the web is sandwiched between a pair of fabrics, with this additional fabric structure being spaced from the part of the web which travels from the first to the second press nip. Subsequent to at least one of the first or second press nips the additional fabric which engages the web is dried before returning to its engagement with the web so as to remove therefrom water which has been transferred thereto from the web.
In a method of manufacturing an upset fiber web such as non-crepe paper, cardboard, or the equivalent thereof, which has the property of being stretchable and/or the property of having a high coefficient of friction, the steps of shortening or upsetting the web, conveying the web after it has been shortened or upset to the first press nip of a press section and then to subsequent press nips thereof where the web is interposed between a common fabric means which is common to and travels to all of the press nips and an additional fabric means which travels at least to the first and second press nips with the web being interposed between the common fabric means and the additional fabric means at the first and second press nips while retaining the additional fabric means spaced from the web as the latter travels from the first to the second press nip, and drying the additional fabric means at least subsequent to one of said first and second press nips for removing from the additional fabric means water received thereby from said web.
Dependencies are inferred from the claim text.