SE0100581L - Process of drying a web-shaped material - Google Patents

Process of drying a web-shaped material

Info

Publication number
SE0100581L
SE0100581L SE0100581A SE0100581A SE0100581L SE 0100581 L SE0100581 L SE 0100581L SE 0100581 A SE0100581 A SE 0100581A SE 0100581 A SE0100581 A SE 0100581A SE 0100581 L SE0100581 L SE 0100581L
Authority
SE
Sweden
Prior art keywords
air
flow
process air
drying
web
Prior art date
Application number
SE0100581A
Other languages
Swedish (sv)
Other versions
SE0100581D0 (en
SE518474C2 (en
Inventor
Evert Nilsson
Original Assignee
Flaekt Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Flaekt Ab filed Critical Flaekt Ab
Priority to SE0100581A priority Critical patent/SE518474C2/en
Publication of SE0100581D0 publication Critical patent/SE0100581D0/en
Publication of SE0100581L publication Critical patent/SE0100581L/en
Publication of SE518474C2 publication Critical patent/SE518474C2/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • D21F5/185—Supporting webs in hot air dryers
    • D21F5/187—Supporting webs in hot air dryers by air jets
    • D21F5/188—Blowing devices

Landscapes

  • Drying Of Solid Materials (AREA)
  • Paper (AREA)

Abstract

The flow of air removed from the dryer section (20), the flow of process air and the amount of heat supplied to the process air are varied or kept constant depending on drying performance. A method for drying a web, preferably a paper web (1), comprises passing the web through a dryer installation containing a number of drying levels with upper blowboxes (13) suspended above lower blowboxes (12), the latter blowing out hot air on the top side in order to dry the web and remove the water vapour expelled from the web. At least some of this process air is recirculated and the air which is not recirculated is removed and replaced with warm air having a low moisture content. The flow if air removed from the dryer section, the flow of process air and the supply of heat to the process air are controlled throughout the drying process. For low drying performance, the flow of air removed from the dryer section and the flow of process air are kept substantially constant, whilst the amount of heat supplied to the process air is varied in order to alter drying performance. For medium drying performance, the flow of air removed from the dryer section and the amount of heat supplied to the process air are kept substantially constant, whilst the flow of process air is varied in order to alter drying performance. For high drying performance, the flow of process air and the amount of heat supplied to the process air are kept substantially constant, whilst the flow of air removed from the dryer section is varied in order to alter drying performance.
SE0100581A 2001-02-21 2001-02-21 Contact free drying process, especially for paper, comprises controlling flow of removed air, flow of process air and amount of heat supplied to process air depending on drying performance SE518474C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE0100581A SE518474C2 (en) 2001-02-21 2001-02-21 Contact free drying process, especially for paper, comprises controlling flow of removed air, flow of process air and amount of heat supplied to process air depending on drying performance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0100581A SE518474C2 (en) 2001-02-21 2001-02-21 Contact free drying process, especially for paper, comprises controlling flow of removed air, flow of process air and amount of heat supplied to process air depending on drying performance

Publications (3)

Publication Number Publication Date
SE0100581D0 SE0100581D0 (en) 2001-02-21
SE0100581L true SE0100581L (en) 2002-08-22
SE518474C2 SE518474C2 (en) 2002-10-15

Family

ID=20283070

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0100581A SE518474C2 (en) 2001-02-21 2001-02-21 Contact free drying process, especially for paper, comprises controlling flow of removed air, flow of process air and amount of heat supplied to process air depending on drying performance

Country Status (1)

Country Link
SE (1) SE518474C2 (en)

Also Published As

Publication number Publication date
SE0100581D0 (en) 2001-02-21
SE518474C2 (en) 2002-10-15

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Legal Events

Date Code Title Description
NUG Patent has lapsed