FI884059A - FOERFARANDE FOER VARMPRESSNING AV EN PAPPERS- ELLER KARTONGBANA OCH TORKNINGSANORDNING FOER TILLAEMPNING AV FOERFARANDET. - Google Patents

FOERFARANDE FOER VARMPRESSNING AV EN PAPPERS- ELLER KARTONGBANA OCH TORKNINGSANORDNING FOER TILLAEMPNING AV FOERFARANDET. Download PDF

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Publication number
FI884059A
FI884059A FI884059A FI884059A FI884059A FI 884059 A FI884059 A FI 884059A FI 884059 A FI884059 A FI 884059A FI 884059 A FI884059 A FI 884059A FI 884059 A FI884059 A FI 884059A
Authority
FI
Finland
Prior art keywords
web
stage
pressing
pressed
water
Prior art date
Application number
FI884059A
Other languages
Finnish (fi)
Other versions
FI884059A0 (en
FI84195B (en
FI84195C (en
Inventor
Jorma Laapotti
Original Assignee
Valmet Paper Machinery Inc
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 Valmet Paper Machinery Inc filed Critical Valmet Paper Machinery Inc
Priority to FI884059A priority Critical patent/FI84195C/en
Publication of FI884059A0 publication Critical patent/FI884059A0/en
Publication of FI884059A publication Critical patent/FI884059A/en
Publication of FI84195B publication Critical patent/FI84195B/en
Application granted granted Critical
Publication of FI84195C publication Critical patent/FI84195C/en

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Abstract

Method and device for pressing a paper or cardboard web W and for draining the web W. In the invention a hot- pressing stage is employed in which the wet web W is pressed in direct contact with a cylinder surface 10' that is heated to a temperature of 100 degrees Celsius. The invention includes a preheating pressing stage C1 or stages A1-C1 in which a relatively long pressing time is used and with relatively low pressing pressure. In the aforementioned preliminary stage the surface layer of the web W which is on the heating surface's 10' side is heated to a temperature of 100 degrees Celsius. The preheating stage or stages are arranged so that already in this stage blowing of steam occurs through web W. Water that is forced into the spaces between fibers of web W is then blown out to the pressed fabric 12. After the preheating pressing stage C1;A1;C1 a stage follows in which the pressing pressure directed against web W is reduced p1 > p0 so that evaporation of the water in web W is made more effective. After this a stage follows in which web W is passed essentially directly to an intensive nip pressing stage A2 or the like where web W is pressed in an essentially greater peak pressure Pmax, Pmax2 than in the preceding stage, in which more water is pressed out from W to the press fabric and in addition steam is blown through web W to create blowing out of water that was forced into the spaces between the fibers of web W. After the last mentioned stage another hot- pressing stage C2 follows in which a relatively long pressing time and relative low pressing pressure p1 is used. <IMAGE>
FI884059A 1988-09-02 1988-09-02 FOERFARANDE FOER VARMPRESSNING I EN PAPPERS- ELLER KARTONGBANA OCH TORKNINGSANORDNING FOER TILLAEMPNING AV FOERFARANDET. FI84195C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FI884059A FI84195C (en) 1988-09-02 1988-09-02 FOERFARANDE FOER VARMPRESSNING I EN PAPPERS- ELLER KARTONGBANA OCH TORKNINGSANORDNING FOER TILLAEMPNING AV FOERFARANDET.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI884059A FI84195C (en) 1988-09-02 1988-09-02 FOERFARANDE FOER VARMPRESSNING I EN PAPPERS- ELLER KARTONGBANA OCH TORKNINGSANORDNING FOER TILLAEMPNING AV FOERFARANDET.
FI884059 1988-09-02

Publications (4)

Publication Number Publication Date
FI884059A0 FI884059A0 (en) 1988-09-02
FI884059A true FI884059A (en) 1990-03-03
FI84195B FI84195B (en) 1991-07-15
FI84195C FI84195C (en) 1991-10-25

Family

ID=8526992

Family Applications (1)

Application Number Title Priority Date Filing Date
FI884059A FI84195C (en) 1988-09-02 1988-09-02 FOERFARANDE FOER VARMPRESSNING I EN PAPPERS- ELLER KARTONGBANA OCH TORKNINGSANORDNING FOER TILLAEMPNING AV FOERFARANDET.

Country Status (1)

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FI (1) FI84195C (en)

Also Published As

Publication number Publication date
FI884059A0 (en) 1988-09-02
FI84195B (en) 1991-07-15
FI84195C (en) 1991-10-25

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MM Patent lapsed

Owner name: VALMET PAPER MACHINERY INC