Method for drying a surface-treated paper web in an after-dryer of a paper machine and after-dryer of a paper machine
AssigneeValmet Corporation
InventorsPasi Ahonen, Juha Kaihovirta
Life of this patent
Estimating the term…
Abstract
An after-dryer and method for drying a surface-treated paper web in an after-dryer of a paper machine in which the web is first finished in a finishing section, i.e., surface-sized or coated, by a finishing device and then dried. In the after-dryer, the paper web is dried in at least one dryer group that makes use of single-wire draw and at the same time, the paper web is dried by an impingement-drying equipment arranged in connection with at least one cylinder or roll in the single-wire dryer group.
Claims26
A method for finishing and drying a paper web in a paper machine comprising the steps of:
- surface-sizing or coating the web by means of a finishing device in a finishing section of the paper machine,
- passing the web through at least one single-wire draw dryer group after the finishing device, each of said at least one single-wire dryer group including first and second rows of web-supporting members and a single drying wire for carrying the web alternatingly between one of said members in said first row and one of said members in said second row, arranging an impingement-drying device in opposed relationship to at least one of said members in said at least one single-wire draw dryer group, and
- directing a drying medium from said impingement-drying device toward the web as the web runs over said at least one member.
A paper machine, comprising
- a finishing section including a finishing device for surface-sizing or coating a paper web, and
- an after-dryer arranged after the finishing device for drying the surface-sized or coated web, said after-dryer comprising
- at least one single-wire draw dryer group arranged after the finishing device, each of said at least single-wire draw dryer group including first and second rows of web-supporting members and a single drying wire for carrying the web over said members, and
- an impingement-drying device arranged in opposed relationship to at least one of said members in said at least one single-wire draw dryer group for directing a drying medium toward the web as the web runs over said at least one member.
Dependencies are inferred from the claim text.