FI122319B - Apparatus and method for treating a fibrous web - Google Patents

Description

APPARATUS AND METHOD FOR HANDLING FIBER FIBER FIELD OF THE INVENTION

The invention relates to an apparatus and method for treating a fibrous web. In particular, but not exclusively, the invention relates to an injection and / or pond extrusion apparatus for a fibrous web and a method for treating a fibrous web in an injection and / or pond extrusion apparatus. The equipment and method can be used in paper, board and post-processing machines.

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BACKGROUND OF THE INVENTION

At certain points, it is desirable to treat the paper or board with a liquid treatment agent, such as an adhesive, a pigment or a coating agent for the paper or board process. Various techniques are known for applying a treatment agent, such as, for example, a pond application method or a film transfer method.

Some examples of pond adhesive extrusion and film transfer extrusion are disclosed in Fl 102200 B.

The runnability of the double-sided pond will deteriorate as the travel speed increases dramatically, especially at speeds above 1000 m / min. On a one-sided pond, runnability is slightly better, but the difficulty is to get enough glue o 25 to the web. Generally, the problem with pond adhesive pressing is the low drying level of the adhesive, which is at its highest at about 10%, but typically at 6-8% in two-sided operation. Increasing the dry solids level of the adhesive is specifically limited by the runnability of the device: the pool becomes unstable

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substance, and on the other hand, as well as speed.

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WO 2006/058961 discloses a method and apparatus in which glue is sprayed onto the surface of a paper or board web from spray nozzles and thereafter the web is led into a press nip.

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When spraying adhesive onto a fibrous web, it has proved difficult to obtain sufficient amount of adhesive on the fibrous web, especially at high basis weights, for example starting at 120 g / m2. When spraying the glue, there may also be dripping of the glue onto the fibrous web or rolls of the glue press.

SUMMARY

According to a first aspect of the invention, there is provided apparatus 10 for treating a fibrous web, the apparatus comprising a first applicator for applying a treating agent to a first side of a fibrous web and a second applicator applying a treating agent to a moving means for moving at least one applicator along a path of movement that follows the surface of the pressing member.

According to another aspect of the invention, there is provided a method of treating a fibrous web in an apparatus comprising a first applicator 20 for applying a treating agent to a first side of a fibrous web and a for moving at least one applicator along a path of motion, which follows the surface of the pressing member.

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Preferably, the actuator is disposed between the clamping body mounting body and the x applicator and comprises a guide and counterparts arranged

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to move along a guide along a path of motion that follows the surface of the press member. Part

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£ 30 of the guide may be cut off and secured to travel with the press member when

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The clamping device is lifted out of position. Preferably, the trajectory is of a circular arc

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shaped.

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Preferably, the actuator comprises a guide attached to the mounting body of the press member, and the actuator comprises counterparts attached to the applicator and adapted to move along the guide along a path of motion that follows the surface of the press member.

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Preferably, the actuator is mounted on one end of the applicator and on the other hand on the outside of the end of the compression member.

Preferably, the actuator comprises a plate-shaped guide having a groove 10 formed as a guide surface, and sliding or rolling counterparts are attached to the applicator.

Preferably, the actuator comprises a guide and a tooth ring mounted on the guide and a drive wheel mounted on the applicator which is rotated through the motor 15 and the drive wheel cooperates with the toothed ring gear.

Preferably, the first applicator is provided with spray nozzles for injecting a treatment agent on the first surface of the fibrous web and / or feed tubes for forming a pool between the first pressing member and the fibrous web.

Preferably, the second applicator is provided with spray nozzles for injecting a treatment agent on one surface of the fibrous web and / or feed tubes for forming a pond between the second pressing member and the fibrous web.

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g Preferably, the feed pipes are arranged to supply the treatment agent to the pool g in a desired manner, e.g., through the surface of the press member or directly into the pool

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Preferably, the position of the applicator around the press member and the inlet angle of the fibrous web 30 are adjustable.

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The distance of the spray nozzles comprising the applicator from the nip can be adjustable by the actuating means acting on the applicator.

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Preferably, the apparatus is a spray and pond adhesive press apparatus. The apparatus may also be a film application apparatus.

Preferably, in the apparatus, the treating agent is arranged to be fed to the surface of the first pressing member and / or the second pressing member to form a treatment film on the face of the pressing member, and in the apparatus the treatment agent film is arranged to be transferred

Preferably, the apparatus is an injection and pond adhesive pressing apparatus having a nip angle of up to 30 degrees. According to some preferred embodiments, the apparatus has a nip angle of up to 20 degrees. The nip angle here refers to the angle between the tangent to the nip roll passing through the roll nip and the vertical.

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The clamping member may be a nip roll or a belt.

Preferably, the first applicator, the first press member and the fibrous web are arranged to form a sealed first injection chamber and / or the second applicator, the second press member and the fiber web are arranged to form a sealed second injection chamber to enhance fog removal and low volume suction air suction.

Various embodiments of the present invention are or will be described in connection with only some or some aspects of the invention. It will be appreciated by those skilled in the art that any embodiment I * of one aspect of the invention may be applied to the same and other aspects of the invention, alone or in combination with other embodiments.

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”30 BRIEF PRESENTATION OF THE PATTERNS

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The invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 illustrates an integrated injection and pond gluing apparatus in which the inlet angle of a fibrous web can be varied, the application beams can be moved by movers around nip rolls; Fig. 2 shows the apparatus of Fig. 1, wherein the first applicator beam is provided with spray nozzles for the first side of the fibrous web and the second applicator beam is provided with feed tubes for a pond on the other side of the fibrous web; Fig. 3 shows the apparatus of Fig. 1, in which a pond on both sides of the fibrous web is formed above the press nip; and Fig. 4 shows the apparatus of Fig. 1, wherein the first applicator beam is provided with feed pipes and the second applicator beam is provided with spray nozzles.

DETAILED EXPLANATION

In the following description, like reference numerals refer to like parts. It is to be noted that the figures shown are not to scale in their entirety, and that they serve merely the purpose of illustrating embodiments of the invention.

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In order to avoid the problems of the prior art, it is also proposed to use the spraying apparatus as a pond sizing device. The same equipment can be used to run the glue at high solids and high speeds with two sprayers and product features, typically o 25 high basis weight product, different pond and spray combinations, ά For example, the same equipment can only run one single-sided, one-sided, spraying or x on a two-sided pond. With the hardware capable of all driving modes,

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one can always choose the most appropriate one for the situation. When switching from duplex ^ 30 to pond spray combination, the dry matter and travel speed ^ need to be reduced somewhat, but not as much as in traditional C \ 1 duplex pond gluing. The combination of spray and pond sizing device shown also also reduces the drip problems that occur under certain conditions 6, since the inlet angle of the web can be turned so that there are no dripping machine members above the web. Further, the apparatus can be driven at least on one side by spraying mode, utilizing the dry and running speed potential of the method.

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Figures 1-4 show an apparatus for treating a fibrous web 1, comprising application beams 6, 7 for applying a treatment agent. The applicator beam 6, 7 can be used to inject the treatment agent onto the surface of the fibrous web 1 and / or to supply the treating agent to the pond 10 5 formed between the fibrous web 1 and the roll 2, 2 '.

The fiber web handling apparatus comprises moving means 8, 8 'for moving the application beams around the nip rolls 2, 2'. Thus, the injection site of the fibrous web treating agent on the fibrous web can be varied and the distance of the injection site from the 15 nip Ns can be selected as appropriate. By selecting the distance of the injection site from the press nip N, it is possible to influence the treatment time of the treatment agent on the fibrous web and thus the penetration of the treatment agent on the fibrous web 1. The inlet angle of the fibrous web Moving the application beams in this way around the nip rolls 2, 2 'enables both the injection equipment and the pond sizing equipment to be integrated into the fiber web processing equipment. If desired, a reciprocal pool 5 may also be formed above the press nip N.

When using the applicator beam as the spray beam, the spray chamber delimited between the spray beam, the nip roller and the o 25 web can be kept tight against the nip roll g at all web inlet angles. The density of the injection chamber substantially influences the amount of de-misting required in the injection process of adhesive g. Thus, the x arrangement according to the invention enables the process to operate optimally at all inlet angles. Preferably, the movable members act on the ends of the application beams. Preferably, the moving means 8, 8 'are arranged outside the ends g of the nip rolls 2, 2'. Thus, according to some embodiments, the nip rolls can be raised

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for example, for replacement and maintenance without the need to remove the actuators 8, 8 'or the application beams 6, 7. The nip roller 7 may be reconditioned in place, for example, the roller coating may be sanded when the applicator is moved by moving means. The movement of the application beams 6, 7 provided by the moving devices is preferably circular.

The fibrous web 1 is guided to the press nip N formed between the nip rolls 2, 2 'through the guide roll 20 from above. The guide roll may be moved along a reciprocating movement path 20 'to adjust the inlet angle of the fibrous web web 1 to correspond to a processing event enabled by the injection and pond gluing apparatus.

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By means of the actuators 8, 8 ', the applicator beam 6, 7 can be introduced into various positions around the nip roller 2, 2', for example, in the maintenance, home, standby and head positioning positions.

15 The first application beam 6 of the injection and pond gluing apparatus is shown in the figures to the left. First applicator beams 6 are provided with first actuators 8. Second actuator beams 7 are provided with second actuators 8 'comprising actuators corresponding to the first actuators and second actuators 8' operating similarly to actuators 8, 8 'of the first applicator bar. along the circular path shown by the arrow 6 'and the second application bar 7 along the circular path shown by the arrow 7'. The movement paths allow the applicators to be moved one at a time or both simultaneously to the sides of the nip rolls (dashed positions 25 and 6.1 of the application beams) and to lift the nip rolls in position σ> for example for replacement and maintenance according to some embodiments 7 must be removed x. For the sake of clarity, only the first ones are described below

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a moving device.

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The moving devices 8 provided in the first application beam 6 comprise

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at the ends of the applicator beam, the guides 9. The guide 9 is preferably secured outside the end of the first nip roll 2.

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Preferably, the guide 9 is secured to the same housing as the bearing of the first nip roll 2 so that the distance 5 between the first applicator beam 6 and the first nip roll may remain the same when the first nip roll is moved. The first nip roll 2 may be intended to be stationary and the second nip roll 2 'may be movably secured with respect to the first nip roll to open and close the nip N between the nip rolls. Preferably, the guides of the second actuating means 8 'provided for the second applicator beam 7 are fixed to the same frame as the bearing of the second nip roll 2' so that the distance between the second applicator beam and the second nip roll is maintained.

The conductor 9 is provided with a conductor surface 10 or conductor surfaces, which preferably form a circular arc-shaped path for the counterparts 11, 12 to be movable along the conductor surface 15. The conductor 9 may be formed of a plate having a circular arc-shaped groove as a guide surface 10. Attached to the applicator beam 6 are a first wheel 11 and a second wheel 12 which may be sliding or rolling counterparts. The first wheel 11 is secured to the applicator beam 6 by the first arm 20 13 and the second wheel 11 is secured to the applicator beam 6 by the second arm 14.

A motor may be provided as an actuator for moving the application beam 6 along the conductor. The motor may be an electric servomotor for stepless adjustment of the position of the application bar. The positioning of the application bar can be made stepwise by means of, for example, limit switches.

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ώ The motor can be used to directly or indirectly rotate the drive wheel 15, for example a gear wheel. Drive wheel 15 is used to form transmission x into guide 9. One preferred way of forming non-slip transmission

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the guide 9 is provided with the guide 9 with a gear ring 16 and rotates by means of the motor ^ 30 a toothed gear wheel 15 to be fitted to the gear teeth which is attached to the applicator beam 6. The motor can be mounted

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to the appliance beam 6 when a gear or belt transmission 17 is formed between the drive wheel 15 and the motor, which can be moved by a gear wheel 18 rotatable by the motor 9. The toothed rim 16 is preferably arranged inside the guide 10; forming, by means of the drive wheel 15, a third support point for reducing the play 5 in the guide mechanism of the actuator 8.

Figures 1-4 illustrate preferred embodiments of the applicator beams, wherein the applicator beam is provided with either spray nozzles 3 for spraying the treatment agent or feed tubes 4 for forming a pond 5. The pond 5 may be formed by spraying the treatment agent on a roll, pond or directly onto a fibrous web by the feed pipes 4. In some cases, a pool may also be formed by spraying the treatment agent with spray nozzles on a roll. Nozzles or conventional manifolds may be used to inject the amount of glue required by the pond 5. To balance the profile, the inlet ends of the feed tube 15 may be reduced to increase the feed pressure. If the pond 5 is dispensed via a roll surface, a roll of good surface thermal conductivity, for example a steel surface roll, may be used as a pool nip roll to smooth the profile. In this way, problems due to variations in the hardness of the rubber coating at different temperatures can be avoided. Applicator beams 20 can be replaced with applicator devices suitable for spraying and / or pool gluing for a desired surface sizing process. Of course, there are applications for surface sizing and embodiments of an integrated spraying and pond gluing system in which the same applicator beam is provided simultaneously with spray nozzles and feed tubes for 25 pond gluing. There are also surface sizing applications σ> and embodiments of the apparatus in which both spray nozzles and feed tubes x can be used simultaneously for pond sizing in the same application bar. Figures 2-4 are omitted for clarity

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without showing the moving means 8, 8 'for moving the application beams to various positions' 30 around the nip rolls 2, 2', o δ

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Figure 1 illustrates a fiber web spraying and pond gluing apparatus for spraying glue on both sides of the fiber web 1 with spray nozzles 3 provided on each of the applicator beams 6, 7. In each of the injection beams, the injection chamber is formed between the surfaces of the spray bar against the fiber web and nip roll, the fiber web and the surface of the nip roll.

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Fig. 1 shows the dashed dashed lines for the various functional treatment positions of the applicator beams 6, 7 and the guide roll 20, which are possible in the combined injection and pond adhesive pressing apparatus at different inlet angles of the fibrous web 1 to the press nip.

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Figure 2 shows the injection and pond adhesive pressing apparatus of Figure 1, wherein the first applicator beam 6 is provided with spray nozzles 3 for the first side of the fiber web 1 and the second applicator beam 7 is provided with feed tubes 4 for the pond 5 on the other side of the fiber web. In this embodiment, the inlet angle of the fibrous web 1 is made more vertical compared to Figure 1. The first appliqué beam 6 to be used as the injection beam is moved by the propulsion apparatus back along the circular motion path 6 'of the nip, whereby the injection chamber of the first appliqué beam 6 is held tightly against the first nip roll. Preferably, the injection chamber 20 is closed by moving the first applicator beam forward towards the fibrous web 1 which is guided vertically by the guide roller 20. The second appliquing beam 7 is moved backward by a moving device along a n-circular motion path 7 '. The second allows the father-7 ikointipalkin supply pipe 4 is supplied to the second side and the second nonwoven web 25 between the nip roll No. 5. The single-käsittelyainelammikko lammikkoliimauksella ά can in some cases reduce the drop and increase the amount of applied adhesive and i penetration compared to the two-sided surface sizing of the X spraying. In this way, speed can still be maintained, at least in part

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other benefits of spray application of the treatment agent.

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Fig. 3 shows the injection and pond adhesive pressing apparatus of Fig. 1, in which a pond 5 is formed above the press nip C1 of the fibrous web. The first applicator beam 6 is provided with feed pipes 4 for feeding the first pond 5 for a pond 5 on the other side of the fibrous web. The first and second appliqué beams 6, 7 are moved backwardly by means of propulsion means via nip circular paths 6 ', 7' of the nip.

Figure 4 shows the injection and pond adhesive pressing apparatus of Figure 1, wherein the first applicator beam 6 is provided with feed tubes 4 for a pond 5 to be provided on the first side of the fiber web and the second applicator beam 10 is provided with spray nozzles 3 for the other side. In this embodiment of one-sided pond gluing, in which the different sides of the fibrous web are treated inversely with respect to Fig. 2, the inlet angle of the fibrous web 1 is made more inclined than with Fig. 1. The second applicator beam 7 for use as the injection beam 15 has been moved backward by the actuation apparatus 15 along a circular path 7 'of the nip, whereby the injection chamber of the second application beam 7 is held tightly against the second nip roll. Preferably, the injection chamber is closed by moving the second applicator beam forward towards the fibrous web 1 which is guided by a guide roll 20 to an inclined position. The first appliquing beam 6 has been moved backward by the actuation apparatus 20 along a circular path 6 'of a nip N. first applicator means 6 feed pipe 4 is fed between the first side and the first nonwoven web nip roll käsittelyainelammikko 5.

The foregoing description discloses lifting rollers without removing the actuators 25. In all cases, however, lifting the clamping member without removing the σ> actuators is not the most appropriate solution. According to some preferred embodiments, a portion of the curved guide passes with the compression member, such as a roll, when the press member is lifted out of position.

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In some preferred embodiments, the conductor is severed. For example, the portion of the ^ 30 guide that defines the remainder of the path of the applicator

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5, may be secured to travel with the roll when the roll C 1 is lifted out of position. For example, the guide portion traveling with the clamping member may be followed by a corresponding portion of the tooth of the actuator.

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When the press member is lifted out of its position, the applicator is preferably positioned at the beginning of the trajectory. The guide defining the start of movement of the applicator may be inclined outwardly from the press member to provide additional space for upward lifting of the press member. By tilting the guide 5, the applicator can be moved laterally sufficiently far from the surface of the press member to be lifted. By means of a split curved guide, a space-saving position of the pressing member for the applicator, such as a composite beam, can be obtained, which can be used as a spray beam and / or pond application beam and / or film transfer application beam.

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In the foregoing description, nip rolls are shown as a press nip press member, but other alternatives may be used as a press nip for the apparatus, for example a belt may be provided as a press member. Preferably, the belt is supported internally by the belt guide roller. Thus, the clamping nip may be formed between a first clamping member, which may be a roll or belt, and a second clamping member, which may be a roll or belt. Thus, there may be several alternate pairs of press nip forming a nip (first and second press members respectively): roll / roll; roller / belt; belt / roller and belt / belt.

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The application apparatus may have more than two applicators adapted to be moved along a trajectory (6 ', 7') following the surface of the pressing member (2, 2 '). In this case, for example, it is possible to speed up the switching of the appliqué combination of the hardware used as the composite appliance without having to make changes to the individual appliqué beam. For one application type, a dedicated application bar may be available per g of fiber web side.

Moving the applicator along a trajectory (6 ', 7') that follows the surface of the press member (2, 2 ') results in the 00 30 circular motion track described with reference to Figures 1-4 when the press member is a roll.

? Movement of the applicator following the roll surface along a circular arc of movement occurs in some preferred embodiments of the apparatus.

When the clamping member is a belt, the movement path of the applicator preferably follows the surface of the 13 belts (e.g., internally supported by the belt guide roller). In this case, the movement path of the applicator may for example consist of a portion of a circular arc and a portion of a straight portion of the belt.

In the foregoing description, embodiments of the invention have been described using, as an example of embodiments of the invention, mainly fibrous web bonding and injection and / or pond adhesive pressing equipment. However, the invention is not intended to be limited to the treatment agents and application methods disclosed in these examples. The invention can also be applied to injection and / or pond pressing equipment for applying treatment agents other than adhesive instead of or in addition to adhesive. The invention can also be applied to other types of fiber web treating agents, such as pigments and coating agents. The invention can also be applied in connection with film transfer.

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In the apparatus, the treating agent may be arranged to be fed to the surface of the first press member (2) and / or the second press member (2 ') to form a treating film on the face of the press member, and the treating film is transferred to the press nip.

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The foregoing description provides non-limiting examples of some embodiments of the invention. However, it will be apparent to one skilled in the art that the invention is not limited to the details set forth, but that the invention may be practiced in other equivalent ways. Some features of the embodiments shown may be utilized without the use of other features.

The foregoing description is to be considered as a description only of the principles x of the invention and not a limitation of the invention. Thus, the invention

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the scope is limited only by the appended claims.

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Claims (18)

Apparatus for treating a fibrous web (1), comprising a first application device (6) for applying treatment means on the first side of the fiber web and a second application device (7) for applying treatment agents on the other side of the fiber web, a press nip (N ) forming two pressing means (2, 2 ') between them and through which the fiber web runs after the application of the treating agent, characterized in that the device comprises a displacement device (8, 8') for moving at least one of the application devices (6, 7). along a path of movement (6 ', 7') which follows the surface of the pressing means (2, 2 '). Device according to claim 1, characterized in that the displacement device (8, 8 ') is arranged between the fastening frame of the pressing member and the application device and comprises a rail (9) and counterparts (11, 12) arranged to move on the rail along a path of movement. (6 ', T) following the surface of the pressing means (2, 2'). Device according to claim 2, characterized in that the path of movement (6 ', 7') 20 is in the form of a circular pitch. Device according to any one of claims 1 to 3, characterized in that the moving device (8, 8 ') comprises a rail (9) which is attached to the fastening frame of the pressing means, and the moving device (8, 8') comprises counterparts o (11, 12). which are attached to the application device (6, 7) and arranged to move σ> along a path of movement (6 ', T) following the surface of the pressing means (2, 2'). i r- · o Device according to any of claims 1 to 4, characterized in that the CL moving device (8, 8 ') is fixed to one end of the application device "(6, 7) and to the other side outside the end of the pressing means (2, 2'). . o δ C \] Apparatus according to any one of claims 1 to 5, characterized in that the displacement device (8, 8 ') comprises a rail of plate construction (9) which is provided with a lock as a guide surface (10) and that the slides or rollers are attached to the application device. in the rafter. Device according to any of claims 1-6, characterized in that the displacement device (8, 8 ') comprises a rail (9) and a gear ring (16) fixed to the rail and a drive wheel (15) attached to the application device (6, 7). ) which is rotated through the mediation of a motor, and the drive wheel cooperates with the cogs of the gear ring. Device according to any one of claims 1 to 7, characterized in that the device comprises spray nozzles (3) arranged in the first application device for spraying treatment means on the first surface of the fiber web and / or feeding tube (4) to form a dust (5). between the first press member (2) and the fiber web (1). 15 Device according to any one of claims 1 to 8, characterized in that the device comprises spray nozzles (3) arranged in the second application device for spraying treatment means on the second surface of the fiber web and / or feeding tube (4) to form a dust (5). between the second pressing member (2 ') and the fiber web (1). Device according to claim 8 or 9, characterized in that the feeding tubes (4) are arranged to supply treatment means to the pond (5) via the surface of the pressing means. δ 25 cv d> Device according to claim 8 or 9, characterized in that the feeding tubes cp (4) are arranged to supply treatment means to the pond (5) directly. CC CL Device according to any one of claims 1 to 11, characterized in that in the device the device is arranged to measure the processing means to the surface of the first press member (2) and / or the second press member (2 ') to form a C processing agent film on the surface of the pressing means, and that in the device is arranged to transfer the processing agent film to the pressing nip by mediating the surface of the pressing means. Device according to any of claims 1-12, characterized in that the position of the application device (6, 7) around the pressing means (2, 2 ') and the inlet angle of the fiber web (1) is adjustable in the device. Device according to any of claims 1-13, characterized in that the device is a spray and / or dust pressing device. Device according to any of claims 1-14, characterized in that the nip angle of the device is at most 30 degrees, preferably 20 degrees. Device according to any of claims 1 to 15, characterized in that the pressing means is a nip roll or a belt. 15 Device according to any of claims 1-16, characterized in that the first application device (6), the first pressing means (2) and the fiber web are arranged to form a tight first spray chamber between them, and the second application device (7), the second the pressing means (2 ') and the fiber web are arranged to form a dense second spray chamber between them, to streamline the removal of fog and to reduce the air-adhesive mist volume sucked out of the spray chamber. A method of treating a fiber web (1) in a device comprising a first application device (6) for applying treatment agent g on the first side of the fiber web and a second application device (7) for applying treatment agent on the second side of the fiber web, a press nip (N) which forms two press members (2, 2 ') between them and through which the fiber web runs after the CL application of the treating agent, characterized in that the device comprises a displacement device (8, 8') for moving at least one of the The application means (6, 7) along a path of movement (6 ', T) which follows the surface of the press member (2, 2').