FI122900B - A conveyor for transporting the threading tape in a fiber web machine - Google Patents

A conveyor for transporting the threading tape in a fiber web machine Download PDF

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Publication number
FI122900B
FI122900B FI20105683A FI20105683A FI122900B FI 122900 B FI122900 B FI 122900B FI 20105683 A FI20105683 A FI 20105683A FI 20105683 A FI20105683 A FI 20105683A FI 122900 B FI122900 B FI 122900B
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FI
Finland
Prior art keywords
flow
air
blowing
characterized
belt loop
Prior art date
Application number
FI20105683A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI20105683A0 (en
FI20105683A (en
Inventor
Juha Laitio
Miika Mankila
Jorma Kinnunen
Tapio Pitkaeniemi
Kenneth Widell
Veli-Matti Virta
Original Assignee
Metso Paper 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 Metso Paper Inc filed Critical Metso Paper Inc
Priority to FI20105683 priority Critical
Priority to FI20105683A priority patent/FI122900B/en
Publication of FI20105683A0 publication Critical patent/FI20105683A0/en
Publication of FI20105683A publication Critical patent/FI20105683A/en
Application granted granted Critical
Publication of FI122900B publication Critical patent/FI122900B/en

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Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21GCALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00Other accessories for paper-making machines
    • D21G9/0063Devices for threading a web tail through a paper-making machine

Description

CONVEYOR FOR TRANSPORTING MAIN TAPE TAPE IN FIBER MACHINE MACHINE

The present invention relates to a conveyor for conveying a threading strap in a fiber web machine comprising 5 - at least two folding rollers, - an air-permeable belt loop arranged around the folding rolls, and - each blowing component includes an air duct and has openings adapted to open downstream of the openings in the direction of the fitted blowing surface to form a vacuum within the strap loop.

15

The introduction conveyor has been commercially available under the brand name FoilForcel. This conveyor is also disclosed in Finnish Patent No. 112267. An air-permeable belt loop wraps around two conveyor rollers of the conveyor. Thus, there are 20 functional belt conveyors which, however, have a special feature of underpressure. The blowing components create a vacuum within the belt loop which produces a vacuum effect. The vacuum effect extends through the strap loop to the headband, which thus remains firmly on the strap loop. In this case, even high speeds can be used on the 25 conveyors. In addition, the conveyor can be mounted in different positions, even upside down. ^ By arranging several conveyors in succession, the headband tether strap can be transported over long distances. There is also a blowing element

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o part of the so-called foil which, by the movement of the strap loop, forms a vacuum without external energy.

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^ However, there are some drawbacks in the known conveyor. First of all, after the vacuum effect, at least part of the air flow ...

^ retracts towards the belt loop causing overpressure, which disrupts the operation of the next foilm. In other words, the blowing component supplies air through the strap loop. In practice, the next foil passes air, which is discharged through the strap loop without allowing 2 to exit into and out of the conveyor body. The air flowing through the strap loops weakens the attachment of the threading strap to the strap loop surface. Secondly, the velocity of the air flow flowing out of the perforation of the blowing component is initially equal to 5 in each hole. Instead, air at the edges of the blowing surface of the blowing component slows down the speed of the air flow and static pressure increases more precisely at the edges. In this case, the central part of the blowing surface has a higher velocity and correspondingly a lower static pressure. This causes the static-10 pressure to rise further out of the hole row as the airflow shrinks. In other words, there is a significantly higher and faster airflow in the center compared to the peripheral parts. Retraction creates an uneven and short vacuum range at the belt loop. In this case, the attachment of the headband is uncertain and the effective dimension of the 15 blowing components is short. In other words, several blowing components must be used for each meter of conveyor length, which in turn affects air consumption.

The object of the invention is to provide a new type of conveyor for conveying the headband in a fiber web machine, which has a more even vacuum effect with less air consumption. It is a feature of the present invention that a flow limiter is provided along the blowing surface away from the already weakened air flow caused by blowing away from the 25-strap link. Even a simple restriction of flow and control away from the belt loop connection has a significant effect on the amount of air flowing through the belt loop, LT)? because the number of air blows is high. The flow of air generated by the flow limiter can be controlled, which equalizes the amount of airflow at the belt loop. This avoids the accumulation of air flow before the next foil and provides a more even vacuum effect. At the same time, air 5 is prevented from venting through the strap loop, further improving

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sticking the tin ribbon to the strap. The conveyor may also have a flow guide for controlling the air flow in the lateral direction of the blowing surface 3. This prevents the flow of air from catching up and the problems that have arisen before.

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

Fig. 1a shows a conveyor according to the invention without a belt loop, Fig. Ib shows a blowing component according to the invention,

Figure 2a is a side view of another embodiment of the blowing component of the invention,

Figure 2b is a side view of a third embodiment of the blow component of the invention fitted to a conveyor, Figure 2c is a side view of a fourth embodiment of the blow component of the invention,

Figure 3a is a plan view of a known blowing component, viewed from above,

Figure 3b is a top plan view of a vir-20 blowing component of the invention.

Fig. 1a shows a conveyor according to the invention for conveying a tensioner ribbon in a fiber web machine. The conveyor includes a body 10 consisting of two steel sections 11 connected by spacers 25. In other words, the body is open at the top and bottom. At each end of the body 10 are folded rolls 12 ci and 13, one of which is connected to a drive motor 14. The conveyor

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? further comprising an air-permeable belt loop 15 which is arranged to be supported by folding rollers 12 and 13. In the figure, the contours of the la x £ 30 strap loop 15 are represented by dotted dashes.

oo 00 g By rotating the belt loop, the conveyor can in principle: o already carry the threading belt 16. A fiber web machine such as

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however, a paper or board machine is, however, a special environment, and 35 headband is otherwise challenging to transport. In practice, the required transport speed is high and the headband is narrow, 4 light and slippery. Accordingly, blowing components 17 are provided on its direct portion within the strap loop 15 to provide a vacuum effect and thereby to engage the threading strap 16 on the surface of the strap loop. In practice, the belt loop resembles 5 wires and is air permeable. In this case, the vacuum created by the blowing components also acts on the headband by holding the headband in the belt loop.

In the exemplary embodiment of Figure 1a, three blowing components 17 are successively disposed within the body 10 such that the pointed leading edge of the blowing component nearly contacts the belt loop. In addition, each blowing component 17 includes an air duct 18 and openings 19. The blowing component 17 shown in Fig. 1b has an air duct 18 formed inside the blowing component 17 and the openings 19 are holes that extend into the air duct 18. By supplying pressurized air air blowing.

Blow holes or nozzles may be used instead of holes.

The openings are arranged to open in the direction of the blowing surface 20 arranged after the openings 19. In practice, this creates a rapid airflow which tends to follow the blowing surface 20. At the same time, a vacuum is formed immediately after the openings. In other words, the blowing component creates a vacuum within the strap loop when the actual driving force comes from the strap stroke movement.

According to the invention, a flow control device 25 is provided adjacent to the blowing surface 20 to direct the already blown air flow generated by the air blast away from the belt loop.

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? Also illustrated is a flow controller 21 for preventing airflow caused by air blowing. By restricting and controlling the airflow x £ 30 background in some way, the vacuum pressure is improved and the velocity distribution more uniform over the entire distance between the foils, whereby the amount of air o is also more uniform in the longitudinal and lateral direction of the blowing surface.

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In this case, the accumulation and contraction of the air flow and the problems caused by them 1 can be avoided.

5

Figures 1a and Ib show an embodiment of a blowing component having both a flow restrictor 25 and a flow guide 21. In this case, the air flow can be controlled both longitudinally and laterally. Regardless of the application, the flow limiter achieves 5 even and effective vacuum pressures. In practice, the flow of air discharged from the blowing component 17 follows the blowing surface 20. The flow restrictor 25 provided before the foil prevents the already slowed flow of air from drifting to the next foil and further through the strap loop. In practice, the flow restrictor may be a damper, a slot 10 or a perforated plate or even a wire, in which case it is still possible to extend the vacuum effect through the flow restrictor. In Figures 1a and Ib, the flow restrictor is illustrated with a diagonal line.

Figure 2a is a side view of the blowing component of the invention. The reduced rectangular shape is easy to manufacture. Surprisingly, a conveyor with a flow limiter further away from the belt loop has been found to produce a more even vacuum across the entire vacuum chamber. The distance of the air-20 duct from the belt loop is about 5 to 30 mm, preferably 7 to 15 mm. Further, the opening between the air channel and the flow restrictor in the vacuum chamber is 15 to 70 mm, preferably 30 to 60 mm. For functionally similar parts, the same reference numerals are used. Here, the blowing surface 20 is long and the vacuum chamber 25 24 is formed above the blowing component 17. Existing cvj £ conveyors can be upgraded by simply replacing the blast components. A simple flow limiter can also be installed,

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? the blowing surface can be replaced or fixed to the old blowing surfaces of the oo 0X1 flow guides according to the invention. Also in the meantime

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A flow limiter 25 extending from the £ 30 blowing surface 20 prevents the air flow from rising up, forcing the blowing air to the end of the surface and away from the conveyor. In this case, the air flow passes away from the upper surface of the strap loop. Thus

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thus, airflow through the strap loop is inhibited and the subsequent foil-35l / blowing component can operate without interference. At the same time, the vacuum effect is maintained for as long as possible and the passage of the threading strap 6 remains calm. The flow restrictor 25 is attached to the vacuum chamber 24 or part of the vacuum chamber 24, which is closer to half of the wall of the vacuum chamber 24, preferably one third of the distance from the air channel 18 to the leading edge of the next vacuum chamber 24 (Figure 5 2a-c).

Figure 2b shows the foil without blowing. Here, the blowing component 17 is moved a distance from the foil, even close to the flow limiter 25. In this embodiment, the opening foil angle 10 will depressurize the opening kidney, whereby further blows will further depressurize the rest of the space. This creates sloping surfaces towards the center of the blowing gap, from which the air flow is removed.

In Figure 2c, the foil and the blowing component are surprisingly connected such that the upper surface of the blowing component forms a functional foil and one side defines a vacuum chamber and the other side is provided with coanda blowing. Here, the first side serves as the flow restrictor according to the invention, although it is also possible here to place a separate short flow restrictor in front of the foil. Also, in the case of coanda blows, a flow controller may be provided to prevent sagging. However, it is of minor importance as the flow surface of the next blowing component prevents the air flow from rising.

The CV or the thread of the inventive marshmallow is configured in different ways for the ortho or guide wire. For example, welded or glued m? the flow limiter or controller will certainly stay in place, oo 0X1, but to change the flow limiter or controller properties-

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There is little chance of £ 30. Normally, changes oo are unnecessary, but production conditions may change or the conveyor may be moved to a different position, whereby the flow limiter or controller may not function optimally. So vir-

The Cvl background limiter or guide may include adjusting means 1 to change the properties of the flow limiter or guide, such as 7 positions, positions, and sizing. Here, it is possible to fine-tune the flow limiter or guide to suit each position.

Figure Ib shows one embodiment of the flow controller 5 according to the invention, wherein the flow guide 21 consists of narrow bars 22 arranged at least partially obliquely with respect to air blows. In addition, the flow restrictor 25 consists of a partially permeable damper. Here, the dampers and rods are straight and form a sharp angle with the air blows. On the other hand 10, a sectional curved damper or rod can be used to control the air flow. In addition, for example, a straight damper or rod can be initially attached to the blowing surface and then bent to form the final distance as desired. Therefore, only a partially secured damper or rod can later be adjusted.

The blow component according to the invention has another new feature. Blowing component 17 includes, before apertures 19, an air gap 23 for supplying replacement air to the flow controller 21. The air gap 23 is illustrated in Figure Ib and opens into the chamber where the rapid air flow from the openings receives replacement air. The result is a smoother and wider vacuum range. Together with the flow controller, the air gap provides an effective and above all uniformly distributed vacuum effect on the headband.

25

The shape and dimensioning of the flow limiter or guide may vary from application to application. Generally, however, the flow controller tn? is arranged in substantially the same plane as the air blows co ^. In this case, the flow controller operates effectively x £ 30 without disturbing the airflow. Also, the dimensioning co of the flow controller has an effect on the functionality. It is essential that the flow controller 00 in can influence the air flow as soon as possible. So

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o For example, in the embodiment of Figure Ib, the flow controller is attached

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air duct 18, whereby immediately upon discharge from the openings, the air is subjected to the action of a flow controller. When the flow guide operates immediately from the apertures, its length 8 has less significance. However, preferably, in the direction of travel of the belt loop, the flow guide extends into the effective vacuum range. In this case, the length of the flow guide may vary in different applications, but the once-controlled flow will continue in the desired direction 5 later. In addition, the airflow rate slows down quickly, reducing the need for control.

Similarly, the structure of the flow limiter or controller may vary from application to application. Preferably, however, the flow guide 21 is secured to the blowing surface 20. In addition, it is useful to ensure that the flow of air between the blowing surface and the flow guide is prevented. This will keep the flow controller in good working order and avoid harmful eddies. In addition, the rapid airflow tends to follow the blowing surface specifically, making the low flow controller 15 effective. The flow guide can be mounted in different ways. The metal flow guide can be attached, for example, by welding or gluing. In addition, bonding is an advantageous way of attaching, for example, a plastic flow guide to the blowing surface. By proper sizing and material selection, the flow guide 20 can be attached to existing blowing components. On the other hand, even the blowing surface can be replaced with an old blowing component. In addition, the flow guide may be shaped to the blowing surface as the blowing surface often consists of a curved plate.

25

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Fig. 3a is a plan view of the velocity distribution of the air flow in the prior art blowing component. Here are the hole nozzle arrays used in this air channel 18. In addition, part of the blowing surface 20 is shown in Fig. 3a, to which is also added an x £ 30 XY coordinate system. The X-direction is the lateral direction of the blowing component, the Y-direction being the longitudinal direction, which is also substantially parallel to the air blowers. In Figure 3a, the airflow is very badly tapered. At the very edges, the airflow stops even

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wholly. Fig. 3b otherwise has a blowing component 1 similar to Fig. 3a, but with the flow controller 9 according to the invention. In this case, the velocity distribution of the air flow is considerably uniform and the tapering can be avoided.

Straight rods are inexpensive to manufacture and long pieces can be cut into suitable pieces. In Fig. Ib, the straight rods 22 are arranged at an angle ex with respect to air blows with an angle α of 1 to 20 °, more preferably 10 to 16 ° (Fig. 3b). Even at a relatively small angle, a significant steering effect is obtained. However, as the angle grows too high, there may be interference with the air flow, 10 which may adversely affect the formation of vacuum. Preferably, the bars 22 are in even number and are arranged to extend from the center of the blowing surface 20 to the edges. In this case, the flow controller controls the air flow towards the peripheral parts of the blowing surface, whereby the velocity distribution of the air flow is leveled. According to the prior art, the significant control effect 15 is immediately after the openings. Thus, according to the invention, the height of the bars 22 is adapted to be lowered in the direction of air blows. The lowering of the rods contributes to the stabilization of the vacuum effect.

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Claims (10)

  1. Transports for transporting the tip pulling belt in a fiber web machine, which transport comprises at least two break rollers (12, 13), - an air permeable belt loop (15) arranged around the break rollers (12, 13), and - inside the belt loop (15) ) in that straight portion there are provided blowing components (17) for effecting a suppressing action, and thus the tip-pulling belt (16) engages the surface of the belt loop (15), and each blowing component (17) comprises an air duct (18) and these openings (19), which are arranged to open in the direction of a blowing surface (20) arranged after the openings (19) for effecting underpressure inside the belt loop (15), characterized in that the distance of the air duct (18) from the belt loop (15) ) is about 5 - 30 mm, presumably 7-15 mm, and a flow restrictor (25) has been provided adjacent to the blowing surface (25) for controlling the already damped air flow from the vicinity of the belt loop (15). and which flow restrictor (25) extends to the area of the previous blowing component (17) blowing surface (20) towards the direction of movement of the belt loop (15).
  2. Conveyor according to claim 1, characterized in that the flow restrictor (25) is arranged at a distance from the air channel (18). (M i tn
  3. Conveyor according to claim 1 or 2, characterized in that the flow restrictor (25) is a plate or a grid. £ 30 co
  4. 4. Conveyor according to any of claims 1-3, characterized in that the flow restrictor (25) is attached to a vacuum chamber (24) contained in the conveyor δ or as part of the wall of the vacuum chamber (M (24)). than one-half, presumably one-third of the distance from the air duct (18) to the leading edge of the next vacuum chamber (24).
  5. Transport according to any one of claims 1-4, characterized in that a flow rectifier (21) is arranged in connection with the blowing surface (20) to prevent the air flow created by the air blowing. 5
  6. Conveyor according to claim 5, characterized in that the flow restrictor (25) and / or the flow converter (21) comprise control devices.
  7. Conveyor according to claim 5 or 6, characterized in that the flow inverter (21) is fixed to the blowing surface (20).
  8. Conveyor according to any of claims 5-7, characterized in that in the direction of travel of the belt loop (15), the flow inverter (21) extends to the area of the effective vacuum.
  9. Conveyor according to any one of claims 5-8, characterized in that the flow inverter (21) consists of narrow bars (22) which are at least partially arranged obliquely in relation to the air blowers.
  10. Conveyor according to claim 9, characterized in that the rods (22) are straight and arranged in the winkein a in relation to the air blasts where the winkein a is 1-20 °, more preferably 10-16 °. c \ j δ {M tn o i oo {M X and CL 00 00 CD in o δ {M
FI20105683A 2010-06-15 2010-06-15 A conveyor for transporting the threading tape in a fiber web machine FI122900B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FI20105683 2010-06-15
FI20105683A FI122900B (en) 2010-06-15 2010-06-15 A conveyor for transporting the threading tape in a fiber web machine

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20105683A FI122900B (en) 2010-06-15 2010-06-15 A conveyor for transporting the threading tape in a fiber web machine
CN 201190000484 CN203188047U (en) 2010-06-15 2011-05-30 Conveyor for conveying webs and leading tailing in fiber web machine
PCT/FI2011/050497 WO2011157890A1 (en) 2010-06-15 2011-05-30 Conveyor for conveying a web threading tail in a fiber web machine

Publications (3)

Publication Number Publication Date
FI20105683A0 FI20105683A0 (en) 2010-06-15
FI20105683A FI20105683A (en) 2011-12-16
FI122900B true FI122900B (en) 2012-08-31

Family

ID=42308138

Family Applications (1)

Application Number Title Priority Date Filing Date
FI20105683A FI122900B (en) 2010-06-15 2010-06-15 A conveyor for transporting the threading tape in a fiber web machine

Country Status (3)

Country Link
CN (1) CN203188047U (en)
FI (1) FI122900B (en)
WO (1) WO2011157890A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2657005B1 (en) * 2012-04-27 2014-06-25 MULTIVAC Sepp Haggenmüller GmbH & Co KG Blow off group for a sealing unit of a packaging apparatus
FI20145349A (en) * 2014-04-11 2015-10-12 Runtech Systems Oy Method for passing a feeding tip from one group of structures to another, and the device and its construction
DE102015001008A1 (en) * 2015-01-28 2016-07-28 Andritz Küsters Gmbh Process and apparatus for the production of wetlaid nonwovens
DE102015005384A1 (en) * 2015-04-28 2016-11-03 Andritz Küsters Gmbh Process and apparatus for the production of wetlaid nonwovens

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4186860A (en) * 1978-10-16 1980-02-05 Crown Zellerbach Corporation Web threading system
FI112267B (en) * 1998-09-29 2003-11-14 Metso Paper Inc A device in a paper machine for transporting and guiding a web threading tape

Also Published As

Publication number Publication date
FI20105683A0 (en) 2010-06-15
FI20105683A (en) 2011-12-16
WO2011157890A1 (en) 2011-12-22
CN203188047U (en) 2013-09-11
FI20105683D0 (en)
FI122900B1 (en)

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