JPH10251989A - Slice regulator for headbox of paper machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the free deformation and regulation of the shape of a bottom slice part forming a slice. SOLUTION: This slice regulator is obtained by providing a slice 11 in order to discharge a raw material onto a wire cloth on a front wall part of a headbox 5, installing many slender grooves 23 in the raw material discharge direction on the undersurface of the tips of a tip slice part 9 and a bottom slice part 10 forming the slice 11 side by side in the width direction, embedding electrically heated wires 24 in the grooves 23 so as to enable the individual temperature control with temperature regulators 25, thermally deforming the bottom slice part 10 with the electrically heated wires 24 and freely changing the profile in the width direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head box slice adjusting apparatus for discharging a raw material onto a plow net in a paper machine.

[0003]

[0002]

[0004]

2. Description of the Related Art As shown schematically in FIG. 3 and FIG. 4, a wet part (Wet part) of a paper machine has a mesh part (Wet part).
ire part 1 and press part (Press par)
t) a head box for allowing the raw material 3 having passed through the screen to flow out as a uniform thin film-like water flow onto the moving grate 4 5

[0005]

The head box 5 connects a header 6 for keeping the discharge flow rate of the raw material 3 in the width direction constant, and a lower end of a mixing chamber 8 having a pulsation absorbing air chamber 7 connected to an upper end thereof. A top slice section 9 and a bottom slice section 1 are provided on the upper front side of the mixing chamber 8.
The slices 11 formed from the raw material 3 are connected via a dispersing unit 12 for dispersing the fibers in the raw material 3 so that the fibers do not agglomerate. The jacks 14 are arranged and arranged in the width direction, and the slice lip 16 that can be moved up and down via the rod 15 by driving each of the jacks 14 is arranged in the width direction along the distal end surface of the top slice portion 9, By changing the amount of projection of the slice lip 16 to the outlet 17 by driving the jack 14 to change the opening of the outlet 17, the slit lip 16 is moved around the breast roll 18 wound around the breast roll 18. The thickness of the raw material 3 flowing out of the slice 11 can be controlled.

[0006]

In the head box 5, when the starting material 3 is started and the raw material 3 is allowed to flow out through the slice 11 onto the plow net 4, the temperature of the raw material 3 (30 to 40 ° C.) causes the top slice portion 9 and the bottom slice portion 10 to move. When the material is thermally deformed, the shape of the outlet 17 becomes a drum shape or a drum shape, and there is a problem that the thickness distribution (basis weight distribution) in the width direction of the outflow raw material 3 is not uniform. By the way, if the opening shape of the outlet 17 becomes a drum shape (the center is concave), the fiber has an orientation angle that flows from the center to the end,
On the other hand, when the shape of the outlet 17 is a drum shape (the center is convex), the fibers have an orientation angle that flows from the end to the center, and the orientation of the fibers is uniform in the width direction. It will not be.

[0007]

[0005] Since such orientation has a problem of seriously affecting the strength and formation of paper, conventionally, a warm water chamber 19 is formed below the bottom slice section 10 and a tank 21 heated by a heater 20 is used. By supplying and circulating the hot water in the hot water chamber 19 by operating the pump 22,
The thermal deformation of the bottom slice portion 10 is prevented.

[0008]

[0006]

[0009]

However, in the case of the method in which the hot water is used to prevent the bottom slice portion 10 from being thermally deformed, the hot water chamber 19 formed at a position apart from the tip of the bottom slice portion 10 is used. Since the thermal expansion effect is used, there is a problem that the thermal deformation of the distal end portion of the bottom slice portion 10 cannot be corrected as desired, and a profile in the width direction cannot be freely created.

[0010]

Accordingly, the present invention provides a slicing apparatus for a paper machine head box in which the thermal deformation at the tip of the bottom slice portion can be effectively corrected and the profile in the width direction can be freely adjusted. It is intended to provide an adjusting device.

[0011]

[0008]

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a head box for allowing a raw material to flow out from a slice formed by a top slice portion and a bottom slice portion onto a plow net. On the lower surface of the tip portion of the bottom slice portion, a plurality of elongated grooves along the raw material outflow direction were provided side by side in the width direction, heat transfer wires were embedded in each of the grooves, and a temperature control device was connected to each of the heat transfer wires. Configuration.

[0013]

When the temperature of each heat transfer wire is adjusted by using the temperature adjusting device, the shape of the tip of the bottom slice can be partially and directly adjusted, and the profile in the width direction can be freely controlled.

[0014]

[0010] A thin plate in which a heat transfer wire is buried in the lower surface of the front end portion of the bottom slice portion of the head box for allowing the raw material to flow out onto the plow net from the slice formed by the top slice portion and the bottom slice portion. Heating plates are arranged and attached at a plurality of locations in the width direction, and the heat transfer wires for each of the heating plates are connected to a temperature control device. Easy to do.

[0015]

[0011]

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

[0017]

FIGS. 1 (a) and 1 (b) show an embodiment of the present invention. In the configuration similar to that of the papermaking machine 1 shown in FIG. On the lower surface of the front end portion, a number of elongate grooves 23 are engraved at predetermined intervals in the width direction so as to extend in the raw material outflow direction. The surface is closed, and a variable resistance type temperature control device 25 is connected to the base end of each heat transfer wire 24, so that the heating temperature of each heat transfer wire 24 can be individually adjusted by the temperature control device 25. The shape of the bottom slice part 10 can be adjusted in each part in the width direction. 26 is each temperature control device 25
, A power supply cable.

[0018]

When controlling the orientation of the raw material 3 flowing out of the slice 11 onto the mesh 4, the slice lip 16 is moved up and down through the rod 15 by driving the jacks 14 arranged in the width direction, and the outlet of the slice 11 is controlled. The amount of protrusion of the slice lip 16 to the slice 17 is changed. At this time, the heating temperature of each heat transfer wire 24 buried in the lower surface of the tip of the bottom slice portion 10 of the slice 11 is simultaneously controlled. .

[0019]

That is, based on the orientation angle of the effluent material 3, each heat transfer wire 2 is
By individually adjusting the temperature of Step 4 and individually heating each section in the width direction of the bottom slice section 10, the width profile of the bottom slice section 10 can be arbitrarily controlled.

[0020]

In the above description, the tip of the bottom slice 10 is the most susceptible to the influence of the temperature of the raw material 3, but in the case of the present invention, a large number of grooves provided on the lower surface of the tip of the bottom slice 10 are used. Since the heat transfer wire 24 is embedded in the inside 23, the shape of the distal end portion of the bottom slice portion 10 can be directly adjusted in each portion in the width direction. This allows
For example, the flow direction of the raw material 3 can be freely selected by making the shape of the outlet 17 which is a gap between the top slice portion 9 constant in the width direction, or making the shape of the outlet 17 be concave or convex. In addition, even if the upstream has any unevenness in the width direction, the flow can be uniformly discharged in the width direction, and the orientation can be made uniform.

[0021]

FIGS. 2 (a), 2 (b) and 2 (c) show another embodiment of the present invention. In the same construction as the papermaking machine 1 shown in FIG. A large number of thin (metal) heating plates 28 which are formed in a curved shape in accordance with the shape of the lower surface of the distal end portion of the bottom slice portion 10 and in which the heat transfer wires 24 are embedded are provided on the lower surface of the distal end portion of the bottom slice portion 10 of the box 5. The heating unit 2 is attached to the base plate of the heat transfer wire 24 for each heating plate 28 in parallel in the width direction.
6 are connected to the respective temperature control devices 25. In addition, the heating plate 28 has only the required range of the front end portion as the joining portion 29. Reference numeral 30 denotes a seal plate at a portion where the heat transfer wire 24 exits from the heating plate 28.

[0022]

As shown in FIGS. 2A, 2B, and 3C, the heating plate 28 can be directly attached to the lower surface of the tip of the bottom slice portion 10 of the head box 5, and FIG.
(B) Bottom slice part 1 as shown in (b)
There is no need for processing for providing the groove 23 in the groove 0, and there is an advantage that the device configuration can be simplified. Further, since only the front end of the heating plate 28 is joined to the lower surface of the bottom end portion of the bottom slice portion 10, heat from the heating plate 28 is applied to the thinnest and most deformable portion of the bottom slice portion 10. Can be transmitted efficiently, whereby profile control in the width direction can be performed more easily.

[0023]

It should be noted that the number of buried heat transfer wires 24 shown in FIG. 1 and the number of affixed heating plates 28 shown in FIG. 2 can be arbitrarily selected, and other various changes are made without departing from the gist of the present invention. Obviously you can get it.

[0024]

[0019]

[0025]

As described above, according to the slice adjusting apparatus for a paper machine head box of the present invention, the following excellent effects are exhibited. (1) On the lower surface of the tip of the bottom slice of the head box, which allows the material to flow out onto the plow mesh from the slice formed by the top slice and the bottom slice, a narrow groove along the material outflow direction is formed. A plurality of heat transfer wires are buried in each of the grooves, and a temperature control device is connected to each of the heat transfer wires. Each part in the width direction of the slice part can be partially and directly heated, and the width direction profile of the tip part of the bottom slice part can be freely controlled, so that the orientation of the outflow raw material is uniform. can do. (2) A thin plate formed by embedding heat transfer wires on the lower surface of the tip of the bottom slice of the head box that allows the raw material to flow out onto the plow mesh from the slice formed by the top slice and the bottom slice. A plurality of heating plates are arranged and pasted in the width direction, and the heat transfer wires for each of the heating plates are
By adopting a configuration in which the temperature control devices are connected to each other, the configuration can be simplified, and assembling of the heat transfer wire to the lower surface of the distal end portion of the bottom slice portion can be performed more easily.

[Brief description of the drawings]

1 shows an embodiment of a slice adjusting device for a paper machine head box according to the present invention, wherein (a) is a schematic side view of a head box portion, and (b) is a front view.

FIG. 2 shows another embodiment of the present invention.
Is a schematic side view of the head box part, (b) is a front view,
(C) is an enlarged perspective view of the heating plate.

FIG. 3 is a schematic configuration diagram illustrating an example of a wet section of the paper machine.

FIG. 4 is an enlarged view showing an example of a head box portion provided in a wet portion.

[Explanation of symbols]

 Reference Signs List 3 raw material 4 grate net 5 head box 9 top slice part 10 bottom slice part 11 slice 23 groove 24 heat transfer wire 25 temperature control device 28 heating plate

Claims (2)

[Claims] 1. An elongated groove along a material outflow direction on a lower surface of a tip portion of the bottom slice of a head box for allowing a material to flow out of a slice formed by a top slice portion and a bottom slice portion onto a plow net. A plurality of heat transfer wires are buried in each groove, and a temperature control device is connected to each of the heat transfer wires. . 2. A thin plate in which a heat transfer wire is embedded in the lower surface of the tip of the bottom slice of the head box for allowing the raw material to flow out onto the plow net from the slice formed by the top slice and the bottom slice. 2. A slice adjusting device for a paper machine head box, comprising: a plurality of heating plates arranged side by side in the width direction, affixed thereto, and a temperature control device connected to each heat transfer wire of each heating plate.