Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F7/00—Other details of machines for making continuous webs of paper
  • D21F7/008—Steam showers

Definitions

• the invention relates to a steam box in a paper/board machine for passing steam into connection with a paper/board web.
• the applicant's earlier FI 945969 patent application discloses a steam box structure which comprises a blower part and a separate steam distributor frame and a connecting duct therebetween.
• the apparatus comprises separate valves through which steam can be passed from the distributor frame through the valves into hoses and further into a distribution chamber/chambers of the blower part and further into connection with a steam distribution surface/a board web/a paper web.
• the regulation valves for regulating the flow of steam into the distributor part are situated in a different unit from that of the discharge surface of steam. The regulation valves can thus be placed more readily in a location where it is easy to service them.
• This application discloses a totally novel type of arrangement for a steam box structure.
• the invention proposes using a separate cassette which contains steam regulation valves and which can be removed from inside the steam box on support of guides.
• the cassette can be removed to a service position or moved altogether out of connection of a machine for servicing.
• the steam box in accordance with the invention is characterized by what is set forth in the claims.
• Figure 1 A is an axonometric view of a steam box from the front.
• Figure IB is an axonometric view of the steam box and from the rear. Dashed lines illustrate a valve cassette and steam feed compartments which are situated inside the steam box and through which steam can be fed from a profiled web width into connection with the web.
• Figure 2 shows a section I— I of the steam box illustrated in Fig. 1A.
• Figure 3 is an axonometric view of taking the valve cassette out of the interior of the steam box.
• Figure 4 shows a section II— II of Fig. IB, i.e. the valve cassette and the steam box in a running position.
• Fig. 1A shows a steam box 10 in connection with a paper/board web.
• the flow of steam into connection with the paper /board web can be regulated by regulating the supply of steam into different feed sections A 1 ,A 2 ... (different feed sections of the steam box) by means of valves arranged across the width of the steam box.
• the steam box may comprise a structure by means of which steam is passed into a constant steam feed section A 100 at the inlet side 50' of a steam discharge surface 50 of the steam box (viewed in the direction of run of the web).
• feed sections A ⁇ A ⁇ A ... At the outlet side 50" of the steam discharge surface 50, there are situated feed sections A ⁇ A ⁇ A ..., of which there are a plurality across the width of the steam box.
• Fig. IB shows the steam box from the rear.
• the steam feed sections A j ,A 2 ... are arranged across the width of the steam box, and steam can be passed from an inlet chamber 11 through the valves 12a 1 ; 12a 2 ... of a valve cassette 14 into each section A 1 ,A 2 ,A 3 ..., as desired.
• the figures show an embodiment in which the steam box is disposed in connection with a cylinder surface, in which connection the discharge surface for the steams of the box is curved.
• the invention is also suitable for straight steam boxes.
• the shape of the steam box is not restricted in any way.
• Fig. 2 shows a section I— I of Fig. 1A.
• steam is passed through an inlet tube into the distribution chamber 11 of the steam box 10 and therefrom, for example, through the valve 12a j into the steam feed section Ai .
• the supply of steam into the feed section A j and further the disch-arge of steam through a discharge surface A ⁇ of the feed section A t into connection with a paper/board web are regulated by moving a spindle of the valve 12S ⁇ . Openings O l 5 O 2 of a spindle tube 13a ⁇ of each valve 12a 1 ; 12a 2 ... open into the space 11, in which connection steam enters a spindle cavity E of the valve 12a 1 ,12a 2 ...
• valves 12a ⁇ ,12a 2 ... are situated in the movable valve cassette 14.
• the valves 12a 1; 12a 2 ... are attached to the cassette 14, which is a box-shaped elongated frame part, the spindle 12b of the valve lla ⁇ extending through a frame surface Ma j of said frame part.
• the position of the valve spindle 12b can be adjusted by adjusting the position of the spindle by means of air pressure.
• the spindle tube 13a is advantageously a flexible, e.g. bellows-like structure, which is positioned at its end 13b, for example, around the steam inlet opening Ji in the wall T j of the feed section A j when the cassette 14 is in a running position.
• the cassette 14, being an elongated box-shaped structure, 4 comprises tube connections e 1( e 2 inside it for each valve 12a 1 ; 12a 2 ... for adjusting the position of each of them by means of air pressure.
• the air pressure can be passed into a space N on the other side of a piston 12c of the spindle 12b of the valve 12a j , 12 2 ....
• the spindle 12b can be pressed against the spring force of a spring 13c to a desired regulation position.
• the cassette 14 preferably comprises wheels, guides or equivalent 15a ⁇ , 15a 2 ... , on whose support the cassette 14 can be brought from a running position to a servicing position.
• an actuator 16 preferably, for instance, an elongated loading hose, for pressing the end of the spindle tube 12b into contact with the wall T, of the feed section A l when the cassette 14 is in the running position.
• the cassette 14 is guided by means of a pull-out casing 17, which defines a steam inlet chamber D j inside it.
• the pull-out casing 17 extends sideways perpendicularly to the machine direction of a paper/board machine and, by means of the pull-out tube 17, the cassette 14 can be drawn sufficiently out of connection of the steam box structures to allow servicing operations.
• the cassette 14 has been drawn to a servicing position from inside the pull- out tube 17.
• Fig. 4 shows a section II— II of Fig. 1.
• Connecting hoses f ⁇ ,f 2 ... are connected to the ends of the tubes e 1 ,e 2 at the end of the cassette 17.

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• Paper (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8550401

Family Applications (1)

Country Status (3)

Cited By (9)

Citations (1)

• 1998
  • 1998-02-13 FI FI980081U patent/FI3463U1/fi not_active IP Right Cessation
• 1999
  • 1999-02-11 AU AU24262/99A patent/AU2426299A/en not_active Abandoned
  • 1999-02-11 WO PCT/FI1999/000104 patent/WO1999041450A1/fi not_active Ceased

Patent Citations (1)

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