FI106272B - Device and process for introducing the leader of a pulp web into a cellulose drier - Google Patents

Description

106272

SYSTEM AND METHOD FOR PUTING THE PULP OF THE PULP ON THE PULP DRYER

ANORDNING OCH FÖRFARANDE FÖR INFÖRANDE AV EN MASSABANAS SPETS I EN CELLULOSATORK

The present invention is directed to a system and method for introducing a pulp end into a pulp drier as defined in the preamble of the independent claims below.

A typical system for passing a moist pulp web end or tip through a pulp dryer comprises a tuft strap forming a closed loop arranged to pass a web path of the web to be dried from the inlet to its outlet and outward from the outlet to the outlet of the actual dryer.

Typically, the threading strap is a double folded tape in which the end or tip of the pulp web, i.e. a narrow strip of pulp web about 120 mm wide, is passed through the dryer. The wet end of the pulp web is now manually moved from the last press section felt onto the 20 threading straps. In this case, the fold of the threading tape is first opened so that the end of the pulp web can be inserted into the fold of the tape, and then the fold is folded again. sealed to secure the end of the pulp web to the fold, and the tape can be led to a dryer. The tape fold 25 is opened, for example, by openers known per se and closed by means of closure pins known per se.

Thus, the introduction of the wet pulp head from the press into the dryer ς now requires, at each start-up, 30 i.e., after each break, a person who manually moves the wet pulp head from the press portion towards the dryer and puts this head into the fold. These types of manual feeds should already be accessed because of the risk of accidents. 35 2 106272 The end of the pulp web can be manually placed on the thread passage at <150 m / min. At higher speeds, the risks of a headache failure increase. Today, pulp machines often have speeds of up to 160 m / min and 5 would need to run at even higher speeds of over 200 m / min, up to 300 m / min in the future. For the purpose of manual feed, the web head export nowadays requires the machine speed to be reduced to <150 m / min during the web head export, which slows the machine 10 to start up.

Tensioning of the headband is nowadays typically performed in vertical headband tensioning towers. In the clamping towers, the threading strap is guided to pass through a U-shaped loop 15 with a weight applied to the lower portion of the loop to tighten the strap to the desired tension. In general, the clamping tower at the wet end of the dryer cannot be adjusted to the optimum position for the thread passage, but must be fitted to the side of the machine, on the service side of the machine, so that the clamping tower is not in front of the dryer In the dry end, similar transfers of the threading ribbon are not necessary, since the end of the pulp web can be guided directly to the pulper delta.

25 • · In order to guide the threading strap to the clamping tower at the wet end of the dryer, the strap has to be moved sideways several times, i.e. transverse to the web passage. The threading strap then has to be guided and pressed with various "fingers", "triangular plates" or the like to support the strap, which strains the strap.

All these measures to support the strap tend to wear the strap as it is rotated. In addition, the long free unsupported strokes inside the clamping tower 35 may cause the headband to rotate inside the tower. As the speeds of the pulp machines increase, these problems become more pronounced and can thus limit the threading of the pulp web.

Therefore, the object of the present invention is therefore

T

providing an improved system and method for introducing a wet pulp web end into a pulp dryer or the like.

The object is then to provide a system and method for introducing a moist pulp web end into a pulp dryer or the like which would allow for a faster start-up.

In particular, it is an object to provide such a system and method in which the end of a pulp web can be automatically and securely secured to the headband.

A further object is to provide a system with better control over the tension of the headband.

To achieve the aforementioned purposes, a system according to the invention for passing a moist pulp web head through a pulp dryer or the like is defined in the preamble of independent claims 1 and 11 of the following claims.

> · ·

A typical system in a pulp machine for passing a damp pulp web head through a pulp dryer comprises a thread thread formed by doubling 30 folded loops, ... members for guiding the thread thread to be dried. · A pulp web passage through the pulp dryer from the pulp web entry point to its exit point and further from the pulp web exit point to its entry point, 35 to transfer a damp pulp web head from the last felt of the press section or the like to the headband.

, 106272 The system further comprises means for opening the fold of the double folded tail strap to fit the end of the pulp web into the fold, and means for re-sealing the fold of the head strap to attach to the head of the mass web. Typically, the fold of the thread opening is opened by a so-called. with the opening wheels, which essentially open the fold completely to 180 °. After the end of the pulp web is brought into contact with the threading strap, as the strap moves forward all the time, the fold of the strap is closed, e.g. Preferably, the pulp web head transfer means having a suction sector is disposed in connection with the tongue strap between the tongue strap opening members and the folding reclosing members.

In a preferred embodiment of the invention, the transfer means provided with a suction sector comprises a suction wheel with a suction sector which is dimensioned to correspond to a width of a narrow tip or head that is to be severed from the pulp web, which is about 100 to 200 mm. The overall length of the suction wheel, in the direction of the shaft 20, is preferably slightly larger than the width of the pulp web head such that the axial length of the suction wheel suction sector corresponds to the width of the mass web end. The diameter of the suction wheel is preferably about 300 to 350 mm.

The suction wheel is mounted, for example, on a pulp web running on the lower felt of the last press, in the transverse direction of the pulp web, on that portion of the web which has been cut or cut for threading. The suction wheel is preferably mounted on the end of this narrow pulp web so that the suction sector 30 of the suction wheel contacts the pulp web in or immediately after the nip between the felt and the suction wheel.

. The suction sector is then preferably arranged to extend at least a small distance to the outlet side of the nip between the felt and the suction wheel, whereupon the suction sector lifts the end of the 35 pulp web from the felt and guides the track along the arc of the head.

5, 106272

In a preferred embodiment of the invention, the head-export strap is brought close to the last press felt so that the suction wheel can be fitted between the felt and the head strap. Thereby, a first nip is formed between the felt and the suction wheel 5 and a second nip between the suction wheel and the head / export tape. The suction wheel, felt, and headband are disposed relative to one another such that the suction wheel in the first nip rotates in the direction of the felt and in the second nip in the direction of the headband. In this case, the suction sector of the suction-10 wheel is arranged to extend from the first nip to almost the second nip, whereby the suction wheel carries a pulp web removed from the felt and transferred to the suction wheel from one end to the other. Preferably, however, the suction sector terminates shortly before the second nip, whereby the end of the pulp web in the other nip can be displaced from the suction wheel to the headband.

The second nip, i.e. the nip formed by the suction wheel and the threading strap, can be provided with a blow on the suction wheel which assists in moving the end of the web towards the threading strap. If desired, the detachable blowing of the end of the web may also be accomplished by a separate blowing blow fitted immediately after this second nip.

According to another preferred embodiment of the invention, a threading strap is also provided to pass through the first nip between the suction wheel and the felt between the suction wheel and the damp pulp web over the felt. Thereby, the suction sector of the suction wheel is arranged at the nip and extending in the direction of travel of the web 30 a short distance ahead of the nip. The suction sector sucks in the nip and a short distance thereafter by suction through the headband, attaching the end of the web to the headband while removing the end of the web from the felt. The length of the suction sector from the circumference of the suction wheel depends e.g. about the overall geometry of the thread thread 35 conversation. Preferably, however, the suction sector extends forward from the nip so that the pulp web portion passing therethrough is controlled to release from the felt and adheres to the headband.

If necessary, a tumbler box or other similar member 5 may be provided in connection with the tongue strap after the suction wheel to ensure that the damp pulp end remains attached to the tympanic strap until the strap is re-closed, i.e. folded twice.

The suction wheel of the invention acts like a pick-up roll and 10 takes the end of the pulp web, e.g., a pulp tip, from the lower felt of the press and transfers it to the opened threading strap. Donation to the headband works safely, safely and quickly.

The above-mentioned suction wheel according to a preferred embodiment of the invention may be thought to be replaced, for example, by a felt or wire mesh over two rolls of suitable size, whereby the end of the pulp web removed from the press felt is guided by 20 felt strands. Hereby, the separation of the end of the pulp web from the felt can be effected either by suction sectors fitted on said rolls or by suction through a felt or wire. By moving the end of the pulp web using a felt or wire loop, it is possible, if necessary, to avoid moving the head-25 tin strip near the press section felt.

In the solution of the invention, the clamping tower may be replaced by a substantially horizontal draw, e.g., a horizontal "clamping carriage" 1 mounted either above or below the dryer. There is generally space below and above the cellulose wrench to accommodate these narrow headband runs. it is not necessary to move laterally out of their natural run, eliminating the need for 35 extra tape controls or presses, which can often be increased.

7, 106272

The required clamping force is obtained by means of wires, for example, from a vertical pole, which can be placed e.g. Alternatively, the required clamping force may be provided by a pneumatic cylinder 5. Hereby, the tension of the threading strap can be continuously adjusted and reduced when the strap does not rotate, which would be advantageous for the strap.

The invention will now be described with reference to the accompanying drawings 10, in which

Fig. 1 is a schematic and exemplary automatic introduction of a pulp web end from a felt of a press into a tuft ribbon, Fig. 2 shows a tongue section of Fig. 1, taken along line AA,

Fig. 3 schematically and exemplarily shows an automatic pulp web end export from a press felt to a end-20 export web of the system of the present invention,

Figure 4 is a schematic illustration of a portion of a pulp dryer having an automatic pulp web head extraction according to Figure 1 to a press felt export head, and Figure 5 is a schematic view of a pulp dryer having an automatic pulp web head extraction according to Figure 3.

30 in Figures 1 and 2 is shown an automatic pulp web end _. · Export system, the threading of the press bottom felt past the threading strip 12. The felt 10 extends in the direction of the arrow around the roller 14. The tail 12 travels in the direction of the arrow to indicate a second opening 35 over the wheel 16 where the doubled strand 12 is opened, the entire width of 12'1, as long as the end of the pulp web 18 is transferred to the felt 10 in connection with the threading of the strip 12.

8 106272

The web end 18 of the transfer is 20 suction wheels which are arranged with the felt 10 and the end of the strip 12 to form the nips 11 and 13 and which extends in the direction of the arrow. The suction wheel 20 has a suction sector 22 marked with a mark 5 extending substantially from the felt 10 to the threading strap 12. The suction wheel is further provided with a "+" short blowing sector 24 followed by the suction sector wherein the web end 18 is dislodged from the suction wheel.

The axial length of the suction wheel is as shown in Figure 2 preferably half the width of the threading strap. The width of the end of the pulp web is generally about half the width of the open threading tape.

At a short distance from the suction wheel, if necessary, a wheel 26 can be fitted which presses the end of the pulp web toward the tail strap 12. The head strap closure members 28 comprising a first closure pin 32 on the first side of the strap and a second from the suction roll 20 to cause the threading strap to close immediately after the suction roll, whereby the end of the pulp web attaches to the web.

Fig. 3, where applicable with the same reference numerals as Figs. 1 and 2, shows another solution of the invention for moving the pulp web end 18 from the press felt 10 to the threading strap 12. In this solution, suction wheel 20 is disposed within loop 34 formed by the threading strap 30. , that the threading strap passes through the nip 11 formed by the felt 10 and the suction wheel 20. In this solution, the suction wheel 20 and the preceding wheel 21 also form the head opening belt 16.

35 In this second embodiment of the invention, a suction box 36 is provided inside the threading loop 34, in addition to the suction roll 20, which holds the end of the pulp web 18 to the threading strap 12 until the strap is closed and continues twofold 12 '' towards the pulp dryer. Instead of the suction box 36, another vacuum-generating member may be used in the solution of the invention, such as a vacuum-blowing box.

In this embodiment of the invention, the threading strap 12 is partially gas permeable so that the suction effect of the suction wheel 20 and the suction box 36 is effected through the strap 12 10 to the end 18 of the pulp web.

Figure 4 shows a portion of a multilayer pulp dryer 38 having a wet end fitted with a pulp web head transfer according to the invention from a press felt 10 to a headband 15 tin strip 12. In the solution of Figure 4, the headband 12 is positioned close to felt 10. Figure 4 shows a long support member of the closure to which the closure pins are attached.

20

When the head has been introduced into the dryer by a doubled bent strap, the suction roll 20 is pulled out of the machine, i.e. out of contact with the felt. The threading strap carries the head through the dryer 25 to the outlet.

Figure 4 is a dashed view showing the course of the entire web width web during normal operation of the machine.

Fig. 4 further shows a tensioning strap 40 of a threading strap arranged below the dryer 38, comprising a tensioning carriage 42 and a drive member 46 connected therewith by a wire 44, which in the case of Fig. 4 may be a weight or e.g. a pneumatic cylinder. In the case shown in Fig. 4, the threading strap is tightened after the strap has come out of the dryer before attaching the end of the pulp web to it.

10 106272

Fig. 5 shows, as in Fig. 4, a portion of a multilayer pulp drier 38. The tapping of this dryer takes place using the system of Fig. 3. In the case of Fig. 5, the threading strap 12 is facing upwardly towards the press felt 10, i.e., in contrast to the case of Fig. 4. The threading strap introduces below the end of the pulp web attached to the suction box 36 to the strip closure 28 of the headband. In this case, the tensioning strap 40 of the threading strap is mounted on the dryer 38. The drive member 46 is secured to the frame structure 10. The dashed line shows the course of the pulp web during normal running.

The solution according to the invention provides an automatic web threading which is safe, secure and enables the use of higher speeds even during threading.

The solution of the invention wherein the tensioning of the headband is arranged in horizontal pulls and the tensioner is arranged above or below the dryer to provide additional free space on the treatment side of the dryer for other functions.

At the same time, the belt-consuming turns and controls that are part of the clamping tower solution are avoided.

The invention is not intended to be limited to the exemplary embodiments set forth above but, on the contrary, is intended to be widely practiced within the scope defined by the following claims.

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Claims (11)

An apparatus for inserting a moist pulp web tip (18) into a cellulose dryer (38) or the like, comprising: - a tip conducting band (12) forming an endless loop which is arranged to run substantially in the same web as the pulp web through the cellulose dryer or the equivalent, from the pulp inlet point to its outlet point and further from the pulp web outlet to its inlet point, and means (20, 36) for transferring the tip of the moist pulp web to be dried (from the press portion) or equivalent, which precedes the cellulose pad 15 or the like, to the tip-carrying band (12), which includes means for attaching the pulp web's tip to the point-carrying band, characterized therein. - means for transferring the tip of the pulp web to be dried, from the felt portion felt or the corresponding to the point leading the belt, comprises an actual transfer means (20) provided with said blanket or the corresponding conveying means (20). to detach the tip of the pulp web from said blanket or equivalent. 2. Device according to claim 1, characterized in that. that - the tip carrying band comprises a double folded band (12), within which folds the pulp web tip is passed through the cellulose sheet or the like, and that; - the means for securing the pulp web tip to the leading band comprises # means (16) for opening the crease in the double folded tape for arranging the pulp web tip into the crease, and means (28) for closing the crease in the crease 16 106272 leading the belt to attach the pulp web to the leading belt. Device according to claim 2, characterized in that. the means (16) for opening the crease in the double folded leading guide belt comprise so-called opener wheels and the means for re-closing the point-carrying belt include the so-called. slutardom. Device according to claim 2, characterized in that. that the transfer means (20) provided with a suction sector (22) is arranged between the means (16) for opening the double folded point leading the belt and the means (28) for closing the fold. 15 5. Device according to claim 1, characterized in that. the transfer means provided with a suction sector (22) comprises a suction wheel provided with a suction sector (22) arranged on the bottom press (10) of the last press or the corresponding running pavement tip, such that the pavement tip runs through the first nip (11) formed by said subfelt or equivalent and the suction wheel, and that - in the suction wheel a suction sector (22) has been formed in the running direction of the pulp web in the sector after said first nip, which suction sector detaches the tip of the pulp web from the sub felt or the like. Device according to claim 5, characterized in that. that - the suction wheel (20) is arranged between the tip 30 (18) of the pulp web running on said sub-felt or the corresponding conveyor belt (12), such that the leading belt and the suction wheel form a second nip (13) [after the suction sector of the suction wheel and that means (24) are provided in conjunction with or after the second nip for transferring the tip of the aforementioned sub felt or the corresponding detached pulp web tip to the leading strip. »106272 Device according to claim 6, characterized in that. for the suction wheel (20), at the second nip (13), there is provided a blowing sector (24) or the equivalent for transferring the tip of the pulp web to the leading belt. 8. Apparatus according to claim 5, characterized in that the point-carrying belt is arranged to pass through the first nip (11) in contact with the suction wheel (20) and that means (36) are arranged in connection with the point-carrying belt for transmitting from the blanket (10) or the corresponding detached pulp web tip (18) to the leading strip. 15 9. Device according to claim 8, characterized in that. that, at the point leading the belt after the suction wheel, a suction bore (36) or the corresponding is arranged for transferring the point of the pulp web to the point leading the belt. 20 Device according to claim 1, characterized in that. that, in the endless loop of the point-carrying band, it has in its extension above or below the cellulose box or correspondingly attached a clamping means (40) which operates substantially horizontally. . A method of inserting a moist pulp web tip (18) into a cellulose dryer (38) or the like, comprising the method of inserting the tip leading strip into a cellulose dryer from the pulp web's inlet to its outlet and further from the pulp outlet to its inlet point, insertion of the tip of the pulp web attached to the tip leading the belt through the cellulose pad or the equivalent from the inlet point of the pulp web to its outlet point; the leading edge of the band and the attachment of the point being characterized therein. 5. a suction effect is directed at the tip of the pulp web, the water of the pulp web is detached from the felt or the corresponding, and the tip of the pulp web is transmitted under the influence of the suction effect in contact with the leading strip. 10