JP2012144813A - Fourdrinier paper machine equipped with formation adjustment mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a Fourdrinier paper machine equipped with a formation adjustment mechanism at the downstream side of a slice of a head box.SOLUTION: This invention provides a Fourdrinier paper machine comprising: a head box to supply a paper material; at least one slice to regulate the feed amount of the paper material supplied by the head box; a shaking device to adjust a formation by shaking the paper material in the width direction and dispersing fibers during the period in which the paper material shifts from the slice onto a wire to become a paper material mat; and a formation adjustment mechanism provided at the downstream side of the slice and at a position anterior to a position where the paper material is dewatered. The formation adjustment mechanism reduces waves generated on the wire by using the shaking machine, which shakes the paper material in the width direction, and adjusts the paper formation.

Description

  The present invention relates to a long net paper machine having a formation adjusting mechanism on the downstream side of a slice of a head box.

  FIG. 1 is a diagram showing an overall configuration of a long paper machine for producing paper, and FIG. 2 is an enlarged view of a dotted line portion of FIG. 1, in which a stock 6 flows from a head box 5 to a wire 2. FIG. As shown in FIGS. 1 and 2, the long paper machine has a wire 2 for endless paper making which is made of a web band and circulates. The wire 2 is bridged between the suction couch roll 3 and the breast roll 4, supported by a plurality of table rolls 14 disposed inside along the wire 2, and guided to circulate.

  A head box 5 is disposed from the upstream side to the downstream side in the upstream portion of the wire 2 (movement start end portion on the upper surface of the wire). The stock 6 is appropriately fed to the head box 5 from a supply source (not shown) and controlled to maintain a predetermined liquid level. The paper 6 is mainly composed of pulp fiber, water, chemicals, and filler.

  In the downstream portion of the head box 5, slices 7a, 7b and 7c are arranged. The supplied stock 6 is supplied from the head box 5 to the upper surface of the wire 2, and then flows out through the gaps between the slices 7 a, 7 b and 7 c and the wire 2, thereby forming a stock mat 13 on the wire 2. Paper making possible.

  As shown in FIG. 2, the stock 6 supplied from the head box 5 flows on the wire 2 which flows on the apron 8 and forms a net shape. The apron 8 is laid from the head box 5 to the slice 7a, and connects the part that is swung by the shaking device 12 and the part that is not swung. The wire 2 is supported by the table roll 14 and conveys the paper 6 supplied from the head box 5 while dehydrating it. The slices 7a, 7b and 7c adjust the flow rate and the flow rate in the width direction of the stock 6 supplied onto the wire 2, that is, the basis weight in the width direction of the paper. The deckle rubber 26 suppresses the supply in the width direction of the stock 6 that circulates on the wire 2. While the stock 6 is supplied onto the wire 2 and becomes the stock mat 13, the shaking device 12 swings the wire 2 in the width direction (left-right direction) to improve the dispersibility of the fibers. To arrange.

  A suction box 11 is disposed in the downstream portion of the wire 2 (the movement termination portion on the upper surface of the wire). The suction box 11 is forcibly sucking and dewatering water contained in the paper mat 13 in the downstream portion of the wire 2 in the paper making process.

  The paper formed with the wire 2 is, from the upstream side, a press part top roll 15, a press part bottom roll 16, paper rolls 17, 18, 19, a press part top roll, a press part bottom roll, a paper roll, an expander (not shown). A roll 20 and a drying device 21 are disposed and sent to the winding device 22 in the final process. The drying device 21 uses a known drying device. The dandy roll 10 is provided to improve the formation of the wet paper and to smooth the surface of the wet paper.

  As described above, the long mesh section 29 of the paper machine 1 is provided with the shaking 12 device and the dandy roll 10 so that high quality paper with uniform texture can be produced.

  For example, in the long paper machine 1 that performs a shaking operation, the head box 5 is placed on the pitching beam together with all the devices constituting the shaking part upstream of the wire 2 so that the flow box moves up and down with the wire. An operation method capable of changing the wire pitch during operation of a long web paper machine that performs a shaking operation, wherein the wire pitch can be changed during operation of the long web paper machine It is disclosed (see Patent Document 1).

Japanese Patent No. 3486658

  As shown in FIG. 3, the shaking device 12 causes the paper 6 to generate a wave in the width direction by swinging the wire 2 left and right, thereby improving the dispersibility of the paper 6. However, as the stock is dehydrated, the speed of the wave slows down, causing fluctuations in the width direction on both sides and the center of the stock, which is a problem in making the paper always uniform. was there.

  Further, there has been a problem that the deckel rubber slides in the width direction due to the swing of the wire and disturbs the formation of both ends of the paper.

  The present invention is intended to solve the above-mentioned problems, and by controlling the influence of waves in the width direction due to shaking and the disturbance of formation due to deckle rubber, it is possible to produce high quality paper with uniform formation. Furthermore, another object of the present invention is to provide a long net paper machine having a formation adjusting function capable of easily adjusting the sheet formation.

  The present invention relates to a head box for supplying paper, at least one slice for regulating the amount of paper supplied from the head box, and the paper moves from the slice onto the wire. Shaking equipment that swings the paper stock in the width direction while forming the mat to disperse the fibers and prepares the texture, and provided on the downstream side of the slice while the paper stock becomes the stock mat, Waves generated on the wire are reduced by swinging the paper material in the width direction with the king device, and the supply of the paper material in the width direction is suppressed by the deckle rubber provided with a groove in the contact portion with the wire. In order to adjust the alignment, it is a long paper machine equipped with a flow regulating plate, a slit mechanism, and a deckle rubber formation adjusting mechanism.

  The formation adjusting mechanism of the present invention is a rectifying plate having a plurality of slit plates.

  By providing a baffle plate on the downstream side of the slice, high quality paper with a uniform texture can be made.

  Further, by providing a groove at the contact portion between the deckle rubber and the wire, it is possible to suppress the side slip caused by the swing of the deckle rubber and to suppress the influence on the formation of both ends. Moreover, the lump of the paper material which generate | occur | produced on the contact surface of a deckle rubber and a wire was eliminated, and the replacement frequency by the damage of a deckle rubber also decreased.

FIG. 1 is a diagram showing the overall configuration of a long paper machine for producing paper. It is a figure which shows the structure by which the paper material 6 is supplied to the wire 2 from the head box 5. FIG. It is a figure which shows the problem in shaking. It is a figure which shows the long paper machine 1 'provided with the formation adjustment mechanism of this invention. It is a figure which shows the baffle plate which has a slit mechanism. It is a figure which shows an example of the shape of the baffle plate which has another slit mechanism. It is a figure which shows an example of the shape of another slit board. It is a figure showing the Example of the baffle plate. It is a figure which shows an example of the groove part of a deckle rubber.

  Embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments to be described below, and various other embodiments can be implemented within the scope of the technical idea described in the claims.

  FIG. 4 shows a long paper machine 1 'provided with the formation adjusting mechanism of the present invention. The long net paper machine comprises a net band and has a circulating endless papermaking wire 2. The wire 2 is bridged between the suction couch roll 3 and the breast roll 4, supported by a plurality of table rolls 14 disposed inside along the wire 2, and guided to circulate. A head box 5 is disposed from the upstream side to the downstream side in the upstream portion of the wire 2 (movement start end portion on the upper surface of the wire). The paper stock 6 is shared by the head box 5, and is appropriately fed from a supply source (not shown) and controlled to maintain a predetermined liquid level. The paper 6 is mainly composed of pulp fiber, water, chemicals, and filler.

  The stock 6 supplied from the head box 5 flows on the apron 8 and is supplied onto the wire 2 having a mesh shape. The apron 8 is laid from the head box 5 to the slice 7a, and connects the part that is swung by the shaking device 12 and the part that is not swung. The stock 6 after the slice 7 travels with the wire 2 while being suppressed in the width direction by the deckle rubber 26 on the wire 2 and is simultaneously dehydrated to become the stock mat 13. The slices 7a, 7b, and 7c are for adjusting the amount and height that the stock 6 supplies onto the wire 2, that is, the basis weight. The shaking device 2 swings the wire 2 in the width direction while the stock 6 is supplied onto the wire 2 and becomes the stock mat 13, thereby improving the dispersibility of the fibers and adjusting the texture.

  A suction box 11 is disposed in the downstream portion of the wire 2 (the movement termination portion on the upper surface of the wire). The suction box 11 is forcibly sucking and dewatering water contained in the paper mat 13 in the downstream portion of the wire 2 in the paper making process.

  The paper formed with the wire 2 is, from the upstream side, a press part top roll 15, a press part bottom roll 16, paper rolls 17, 18, 19, a press part top roll, a press part bottom roll, a paper roll, an expander (not shown). A roll 20 and a drying device 21 are disposed and sent to the winding device 22 in the final process. The drying device 21 uses a known drying device. The dandy roll 10 is provided to improve the formation of the wet paper and to smooth the surface of the wet paper.

  The long web paper machine 1 ′ provided with the formation adjusting mechanism of the present invention has a characteristic until the paper material supplied to the long mesh part becomes the paper material mat 13. Specifically, the long paper machine provided with the formation adjusting mechanism of the present invention includes a head box 5, a slice 7, a shaking device 12, and a current plate 23 provided with a slit plate 25.

  The head box 5 is provided with at least two plates 9 for the flow of the paper in order to disperse the paper, suppress the pulsating flow and the turbulent flow. It is provided to disperse the stock and make the supply balance uniform.

  The slices 7a, 7b and 7c are provided for adjusting the supply of the stock and adjusting the basis weight variation.

  The shaking device is provided to disperse the paper stock and improve the formation.

  The deckle rubber 26 suppresses the supply of the paper 6 in the width direction and adjusts the paper making width. Further, the deckle rubber 26 has a groove portion 28 for suppressing side slip due to shaking as shown in FIG. The groove portion 28 of the deckle rubber 26 has shapes such as a hatched groove, a horizontal line, a vertical line, and a dot. Side slip can be effectively suppressed by combining the shapes of the grooves 28. The wire 2 and the deckle rubber 26 are installed so that the surfaces of the wire 2 and the deckle rubber 26 having the groove portions 28 are in contact with each other.

  The rectifying plate 23 provided with the slit plate 25 is provided on the downstream side of the slice 7 until the stock 6 becomes the stock mat 13, and is arranged in the width direction generated in the stock 6 by the shaking device 12. Reduce wave variability.

  FIG. 5 shows a rectifying plate 23 having a slit plate. As shown in FIG. 5, the rectifying plate 23 has a slit plate 25 and forms a slit mechanism 24. As shown in FIG. 7, the rectifying plate 23 divides the wave in the width direction of the paper 6 by the slit plate 25 to form the slit mechanism 24. The slit mechanism 24 makes the formation of a uniform texture by dividing the waves into uniform waves at regular intervals in the entire width direction by dividing the influence of the waves in the width direction on the formation of both ends of the paper 6. Further, the slit mechanism 24 also has an effect of not suppressing the flow of the paper 6 when the rectifying plate 23 is held from above the paper 6.

  Five slit plates 25 in FIG. 5 are provided and nine slit mechanisms 24 are provided, but the present invention is not limited to this, and one or more slit plates 25 and two slit mechanisms 25 are provided. It is preferable to provide the slit mechanism 24 described above. The interval between the slit mechanisms 24 may be determined in consideration of the wavelength in the width direction determined by the frequency of the shaking device 9 and the water depth of the paper 6. However, since the water depth of the stock 6 becomes shallow due to dehydration and the properties of the waves change, the interval of the slit mechanism 24 is determined in consideration of the water depth, frequency, amplitude, paper making width, paper making speed, and the concentration of the paper 6. There is a need.

  Further, the thickness of the slit plate 25 is not particularly limited, but is preferably a thickness that does not affect the flow of the stock 6 as much as possible. However, if the thickness is reduced too much and the rigidity is lowered, the slit plate 25 may wave and generate new waves, which may deteriorate the formation.

  FIG. 6 shows other shapes of the current plate 23. If the speed of the stock 6 is high, there is a risk that waves will be generated again after passing through the rectifying plate 23 when the rectifying plate 23 is triangular.

  Further, the shape of the slit plate is not particularly limited, but a shape that is streamlined and does not hinder the flow of the stock 6 and does not catch fibers is preferable. Other shapes of the slit plate 25 are shown in FIGS.

  The rectifying plate 23 has a structure capable of adjusting the angle. The angle and depth at which the slit plate 25 touches the paper 6 can be adjusted, and fine adjustment is possible. The depth at which the current plate 23 is brought into contact with the paper stock 6 needs to be shallower than the paper mat 13. When the paper mat 13 is touched, a trace on the line is generated on the paper.

A papermaking method using a long paper machine equipped with a formation adjusting mechanism will be described.
In the paper making method, the stock 6 is supplied from the head box 5, the amount of the stock 6 supplied from the head box 5 is adjusted by at least one slice 7, transferred to the wire 2, and the shaking device 12, the wire 2 is swung in the width direction until the paper mat 13 is formed, the fibers are dispersed and the formation is adjusted, and the paper 6 on the wire 2 is formed by the current plate 23 having the slit mechanism 24. By reducing the influence of the generated waves in the width direction, paper with a uniform texture is produced.

  The deckle rubber 26 provided with the groove portion 28 circulates on the wire 2 and is regulated so that the paper 6 stays on the wire 2 to determine the width of the paper 6. The groove portion 28 of the deckle rubber 26 improves the frictional force of the contact surface in the width direction between the deckle rubber 26 and the wire 2. For this reason, the slide of the deckle rubber 26 is reduced, and a sheet of uniform texture is made.

DESCRIPTION OF SYMBOLS 1 Paper machine 2 Wire 3 Suction couch roll 4 Breast roll 5 Head box 6 Paper 7a, 7b, 7c Slice 8 Apron 9 Slat board 10 Dundee roll 11 Suction box 12 Shaking apparatus 13 Paper mat 14 Table roll 15 Press top Roll 16 Press section bottom roll 17, 18, 19 Paper roll 20 Expander roll 21 Drying device 22 Winding device 23 Current plate 24 Slit mechanism 25 Slit plate 26 Deckle rubber 27 Deckle frame 28 Groove portion 29 Long mesh portion

Claims (2)

  A head box for supplying the paper, at least one slice for regulating the amount of the paper supplied from the head box, and the paper moves from the slice onto the wire, Shaking device that swings the wire in the width direction until the mat is formed to disperse the fibers and adjust the formation, and the stock material is provided on the downstream side of the slice and before squeezing A long net paper machine provided with a formation adjusting mechanism for adjusting the formation by reducing waves generated on the wire by swinging the width direction of the stock by the shaking device.   The long net paper machine provided with the formation adjusting mechanism according to claim 1, wherein the formation adjusting mechanism is a rectifying plate having a plurality of slit plates.

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