JP6028167B2 - Head box and paper machine - Google Patents

Description

  The present invention relates to a head box and a paper making apparatus.

Regarding a head box that supplies a pulp suspension as a papermaking raw material to a papermaking net, the following Patent Document 1 discloses a technique including a stirring unit that stirs a pulp suspension stored in a head box body. .

JP 2012-46845 A

In the head box described in Patent Document 1, a horizontal guide plate is installed from the upper edge of a part of the side wall forming the storage portion toward the upper surface of the papermaking net. And when the pulp suspension in a storage part is supplied to a papermaking net | network, it distribute | circulates on this guide plate. On this horizontal guide plate, agglomerated pulp may be placed. Agglomerated pulp hinders the flow of subsequent pulp suspension. The pulp suspension flowing through this location tends to have a locally low pulp concentration. In the paper thus obtained, streaky thin-walled portions, holes, and the like are formed, resulting in quality deterioration.

The present invention solves the above-described problems, and provides a head box capable of supplying a pulp suspension in a uniform state without deviation from a storage section to a paper making net, and a paper making apparatus including the head box. Objective.

In order to achieve the above object, a head box according to the present invention includes a storage section that stores a pulp suspension, and the pulp in the storage section is near the upper portion of the overflow side wall of the pulp suspension of the storage section. An extruding member for extruding the suspension to the paper making net is installed, and the extruding member repeatedly reciprocates so as to expand and contract the overflow channel formed between the extruding member and the overflow side wall.

Moreover, the said structure WHEREIN: The overflow side part is provided with the uphill inclination part inclined in the uphill slope.

And in the said structure, the extrusion member is provided with the extrusion upward inclination part inclined to the upward slope facing the upward inclination part.

  Further, in each of the above-described configurations, the overflow side wall is provided with a downward inclined portion that is inclined downward and adjacent to the downstream side of the upward inclined portion.

Furthermore, in each said structure, a storage part is equipped with the stirring part which stirs the pulp suspension stored inside.

Further, in each of the above configurations, the stirring unit includes a stirring plate and a stirring plate moving unit that reciprocates the stirring plate, and the pushing member approaches the overflow side wall as the stirring plate moving unit reciprocates. Spaced apart.

According to the headbox of the present invention, the storage unit for storing the pulp suspension is provided, and the pulp suspension in the storage unit is made near the upper part of the overflow side wall of the pulp suspension of the storage unit. An extruding member that pushes out to the net is installed, and the extruding member repeatedly reciprocates so as to expand and contract the overflow channel formed between the extruding member and the overflow side wall. The flow rate of the overflowing pulp suspension is changed, and by this change in speed, the pulp suspension supplied to the papermaking net can be made uniform and uniform.

In addition, when the overflow side wall is provided with an ascending slope that is inclined upward, even if there is a block of pulp in the reservoir, it is less likely to stay longer on the upper surface of the ascending slope, and the pulp suspension The liquid can be distributed smoothly.

When the extruded member is provided with an extruded upward inclined portion that is inclined in an upward gradient so as to face the upward inclined portion, the upward inclined portion and the extruded upward inclined portion are both maintained in an inclined posture. Since they are relatively close to each other, the flow rate of the pulp suspension that overflows above the overflow side wall can be changed more efficiently.

Furthermore, when the downflow inclined portion inclined downward is provided on the overflow side wall adjacent to the downstream side of the upward inclined portion, the pulp suspension flows upward according to the upward gradient of the upward inclined portion. After that, the flow proceeds obliquely downward while increasing the flow velocity due to the downward gradient of the downward inclined portion. Therefore, the pulp suspension that has flowed out of the storage section is less likely to stagnate in the middle of the distribution path, and can be distributed smoothly.

Furthermore, when the storage unit is equipped with a stirring unit that stirs the pulp suspension stored inside, the aggregated pulp aggregate that remains in the corners of the storage unit and the like is destroyed by stirring of the stirring unit. And can be dispersed.

The stirring unit further includes a stirring plate and a stirring plate moving unit that reciprocates the stirring plate, and when the pushing member is moved closer to and away from the overflow side wall in accordance with the reciprocating operation of the stirring plate moving unit, The stirring plate and the pushing member can be efficiently moved by the stirring plate moving part.

1 is a schematic configuration diagram of a paper making apparatus according to an embodiment of the present invention. It is a perspective view of the head box and wire part of the papermaking apparatus. It is a rear view of the head box. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. FIG. 4 is a cross-sectional view taken along line B-B in FIG. 3. It is CC sectional view taken on the line of FIG. It is DD sectional view taken on the line of FIG. It is the schematic of the press part of the said papermaking apparatus, a drying part, and a finishing part. It is a use mode figure of a head box and a wire part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a paper making apparatus provided with a paper making apparatus according to the present invention. In the present embodiment, the paper making apparatus is configured as a used paper recycling apparatus that performs recycled processing using recycled paper as a raw material to obtain recycled paper, but is not limited thereto. In FIG. 1, a used paper recycling apparatus 100 includes a pulp manufacturing unit 1, a deinking unit 2, a paper making unit 3, and a control unit 8. The control unit 8 controls operations of the pulp manufacturing unit 1, the deinking unit 2, and the paper making unit 3. The pulp manufacturing unit 1 and the deinking unit 2 can use known pulp manufacturing apparatuses and deinking apparatuses, respectively.

The papermaking unit 3 is constituted by a papermaking apparatus S. The paper making apparatus S includes a head box 11 and a wire unit 12 shown in FIG. 2, a press unit 13, a drying unit 14 and a calendar unit 15 shown in FIG. 8, and a cutting unit (not shown).

3 is a rear view of the head box 11, FIG. 4 is a sectional view taken along line AA in FIG. 3, FIG. 5 is a sectional view taken along line BB in FIG. 3, and FIG. FIG. 7 is a sectional view taken along line D-D in FIG. As shown in FIGS. 2 and 3, the head box 11 includes a frame 27. The frame 27 includes an upper frame body 23, a lower frame body 24, a left frame body 25, a right frame body 26, and a support base 28. The support base 28 is installed in the middle between the left frame body 25 and the right frame body 26, and the head box body 21 is placed on the support base 28.

As shown in FIGS. 3 to 6, the head box main body 21 includes a bottom plate 31 and a side wall 37 erected on the outer peripheral edge of the bottom plate 31. The side wall 37 includes a front side plate 32, a rear side plate 33, a left side plate 34 and a right side plate 35. The upper portion of the head box body 21 is open. And the storage part 36 which stores a pulp suspension is formed in the head box main body 21 inside.

As shown in FIG. 2, the left side plate 34 and the right side plate 35 are respectively provided with width guides 38 and 39 protruding forward. The width guides 38 and 39 extend a predetermined length along the upper surface of the papermaking net 71 constituting the wire portion 12. The width guides 38 and 39 prevent the pulp suspension supplied from the storage unit 36 onto the papermaking net 71 from flowing out to the left and right sides. Further, the width guides 38 and 39 define the length in the width direction of the wet paper 9 obtained by papermaking. The front end portions of the width guides 38 and 39 are connected by a connecting member 40 at a height position that does not contact the wet paper web 9.

As described above, the front side plate 32 constitutes a part of the side wall 37 that forms the storage portion 36. The installation height of the front side plate 32 is lower than the rear side plate 33, the left side plate 34, and the right side plate 35 by a predetermined amount. Thus, the pulp suspension stored in the storage unit 36 is overflowed from above the front side plate 32 and supplied to the papermaking net 71. Therefore, the front side plate 32 constitutes an overflow side wall 43 in which the pulp suspension overflows.

As shown in FIG. 6, the front side plate 32 as the overflow side wall 43 includes an ascending inclined portion 41 and a descending inclined portion 42. The ascending slope portion 41 and the descending slope portion 42 are formed to bend so as to cover the outside of the papermaking net 71 that travels around. The ascending slope 41 is provided with an ascending slope on the upstream side in the flow direction F of the pulp suspension from the reservoir 36 to the papermaking net 71. More specifically, the upward inclined portion 41 is bent at a predetermined angle θ from the vertical direction at a position o where the front side plate 32 erected on the bottom plate 31 is lower than the installation height p of the papermaking net 71 traveling on the upper side. It is formed by that. The downstream edge of the upward inclined portion 41 protrudes at a position q higher than the installation height of the papermaking net 71 traveling on the upper side.

On the other hand, the downward inclined portion 42 is provided on the downstream side in the flow direction F of the upward inclined portion 41, adjacent to the upward inclined portion 4, and inclined downward. The downward inclined portion 42 guides the pulp suspension beyond the downstream end edge of the upward inclined portion 41 to the papermaking net 71. The left and right ends of the ascending inclined portion 41 and the descending inclined portion 42 are fixed to the lower portions of the width guides 38 and 39 with an adhesive or the like, respectively.

The storage portion 36 is partitioned into a first chamber 46 and a second chamber 47 by a partition wall 44 in the front-rear direction. The partition wall 44 is suspended up to the hollow height position of the storage portion 36, and the left and right edges of the partition wall 44 are supported by the left side plate 34 and the right side plate 35, respectively. Thus, the lower portion of the first chamber 46 and the second chamber 47 communicate with each other.

In the bottom plate 31, an inflow portion 50 for allowing the pulp suspension to flow into the storage portion 36 is formed in the center portion in the width direction W of the first chamber 46. A pipe 51 is connected to the inflow part 50, and a pulp suspension sent by a pump (not shown) from the deinking part 2, which is a previous process, flows into the storage part 36.

The storage unit 36 includes a stirring unit 55 that stirs the pulp suspension stored inside. The stirring unit 55 includes stirring plates 53 a and 53 b and a stirring plate moving unit 54. The stirring plates 53 a and 53 b are made of a thin metal plate disposed in a horizontal posture in the width direction W of each of the first chamber 46 and the second chamber 47. The stirring plate moving unit 54 moves the stirring plates 53a and 53b in the vertical direction. The stirring plate moving unit 54 includes an arm 58, a link member 59, rotating bodies 60a and 60b, a crankshaft 61, a driving gear 62, a driven gear 63, and a driving unit (not shown).

A pair of arms 58 is installed in each of the first chamber 46 and the second chamber 47. As shown in FIG. 3, the pair of arms 58 are installed at a predetermined distance in the width direction, and the stirring plates 53 a and 53 b connect the lower ends of both arms 58. As shown in FIG. 6, the upper portion of each arm 58 is pin-joined to the lower end portion of the link member 59. The upper end portion of the link member 59 is pin-joined to the eccentric positions of the rotating bodies 60a and 60b. As shown in FIG. 4, the rotating bodies 60 a and 60 b are attached to the left and right ends of the crankshaft 61, and the rotating bodies 60 a and 60 b rotate with the rotation of the crankshaft 61.

Both crankshafts 61 are rotated by rotation of a pair of driven gears 63 shown in FIG. A drive gear 62 is installed between the pair of driven gears 63. The drive gear 62 is engaged with both the pair of driven gears 63. As shown in FIG. 4, the drive gear 62 is provided at one end of the drive shaft 64. The drive shaft 64 is pivotally supported on the upper portion of the right frame body 26. The other end of the drive shaft 64 protrudes outward from the right frame 26 and is connected to a drive unit such as a motor (not shown).

  As shown in FIG. 6, the rotating body 60a installed above the first chamber 46 and the rotating body 60b installed above the second chamber 47 have eccentric positions r1 and r2 at which the link member 59 is pin-joined. The phase is shifted by 180 °. Accordingly, the respective stirring plates 53a and 53b of the first chamber 46 and the second chamber 47 are adjusted so as to move in the vertical direction with a phase shifted by 180 ° from each other. For example, the stirring plate 53a of the first chamber 46 is the lowest The stirring plate 53b of the second chamber 47 is in the uppermost position.

In the vicinity of the upper portion of the overflow side wall 43 of the pulp suspension in the storage section 36, an extrusion member 66 that pushes the pulp suspension in the storage section 36 to the papermaking net 71 is disposed. The pushing member 66 has a shape in which a metal rectangular thin plate material is bent, and is installed to face the front side plate 32. The lower part of the pushing member 66 is installed along the vertical direction. The left and right ends of the lower portion of the pushing member 66 are supported by lower portions of the front end edges of the left and right arms 58 of the second chamber 47.

Further, the upper portion of the pushing member 66 is provided with a pushing up inclined portion 93 that is inclined in an upward gradient so as to face the rising inclined portion 41. The pushing member 66 is moved up and down as the arm 58 of the stirring plate moving part 54 moves in the up and down direction, so that the pushing up inclined part 93 of the pushing member 66 moves between the pushing member 66 and the overflow side wall 43. And the overflow side wall 43 relatively close to and away from each other so as to expand and contract the overflow channel formed therebetween. Then, as shown by broken lines in FIG. 6, the left and right arms 58 and the stirring plate 53 b of the second chamber 47 are lowered, and the opposing surfaces of the push-out member 66 and the upward inclined portion 41 are close to each other, so The liquid is pushed downstream and is forced to flow out to the papermaking net 71.

As shown in FIG. 2, the wire portion 12 includes an endless papermaking net 71. The papermaking net 71 is stretched over a plurality of rollers 70. A plurality of sliding contact members 74 are juxtaposed along the traveling direction inside the papermaking net 71. The sliding contact member 74 is in sliding contact with the lower surface of the papermaking net 71 traveling on the upper side, and guides white water flowing down from the mesh of the papermaking net 71 downward. A water receiving portion 72 is provided below the sliding contact member 74. The water receiver 72 receives white water flowing down from the papermaking net 71. The water receiver 72 is connected to a white water tank (not shown). The white water tank includes a pipe and a pump (not shown) for sending white water contained therein to the pulp manufacturing unit 1 and the deinking unit 2.

8 includes a pair of upper and lower water-absorbing belts 78a and 78b, a plurality of rollers 77, and a plurality of squeezing rollers 79. The pair of water absorbing belts 78 a and 78 b are made of felt, are each formed endlessly, and are stretched between a plurality of rollers 77. The upper water-absorbing belt 78a and the lower water-absorbing belt 78b run in contact with each other. The squeezing roller 79 is installed at this abutting portion, squeezes both the water absorbing belts 78a and 78b from above and below, and squeezes the wet paper sandwiched between the water absorbing belts 78a and 78b.

The drying unit 14 includes a pair of upper and lower drying belts 84, a plurality of rollers 82, and a drying roller 83. The drying belt 84 is stretched around a plurality of rollers 82 and a drying roller 83. The upper and lower drying belts 84 are in contact with each other, and a plurality of drying rollers 83 are arranged at the contact positions of the upper and lower drying belts 84. The drying roller 83 includes a heater 85 inside.

The calendar unit 15 includes a plurality of press rollers 87 for increasing the flatness of the paper. The cutting unit includes a cutting blade (not shown) for cutting the obtained belt-like paper into a predetermined sheet size.

(Function)
The operation of the paper making apparatus 100 according to the present embodiment will be described below. First, a pulp suspension is manufactured by stirring a predetermined amount of used paper 6 together with a predetermined amount of water in the pulp manufacturing unit 1 for a predetermined time. Next, the obtained pulp suspension is sent to the deinking section 2, and deinking processing is performed to obtain a pulp suspension after deinking. The pulp suspension after deinking is hydrated in the deinking section 2 or in the middle of the flow path from the deinking section 2 to the papermaking section 3, adjusted to a predetermined pulp concentration suitable for papermaking, It is sent to the head box 11.

As shown in FIG. 3, in the head box 11, the pulp suspension sent from the pipe 51 flows from the inflow portion 50. The control unit 8 drives the drive unit of the stirring plate moving unit 54 immediately after the pulp suspension starts to flow from the inflow unit 50. By driving the drive unit, the drive shaft 64 is rotated, the drive gear 62 is rotated, and the pair of front and rear driven gears 63 are rotated in the same direction. As the driven gear 63 rotates, the rotating bodies 60a and 60b rotate through the crankshafts 61, respectively, and the stirring plates 53a and 53b move up and down through the link member 59 and the arm 58.

Thus, the pulp suspension stored in the storage unit 36 can be stirred by moving the stirring plates 53a and 53b in the vertical direction by the stirring plate moving unit 54. Therefore, the aggregated pulp aggregates can be broken and dispersed by stirring by the stirring unit 55 while staying at the corners of the storage unit 36 where the flow rate decreases, and can be distributed downstream.

When the inflow amount of the pulp suspension from the inflow part 50 exceeds the capacity of the storage part 36, the pulp suspension in the storage part 36 circulates through the distribution path formed by the front side plate 32, To be leaked. At that time, the pulp suspension first flows upward according to the upward gradient of the upward inclined portion 41. Even if the bulky pulp in the storage part 36 flows into the upward inclined part 41, it is difficult to stay in the upward inclined part 41 for a long time due to the inclination. Therefore, the pulp suspension can be smoothly circulated to the downstream side without disturbing the distribution of the pulp suspension by the bulky pulp, and the pulp suspension is suspended in the netting net 71 in a uniform state with no unevenness of the pulp concentration. Liquid can be supplied.

In addition, the overflow side wall 43 is provided with a descending slope 42 that is inclined in a descending slope adjacent to the downstream side of the ascending slope 41, so that the pulp suspension follows the ascending slope of the ascending slope 41. After flowing upward, it flows downward while increasing the flow velocity by the downward gradient of the downward inclined portion 42. Therefore, the pulp suspension that has flowed out of the storage section 36 can be smoothly circulated without stagnation in the middle of the distribution path.

Further, the pushing member 66 moves in the vertical direction as the arm 58 of the second chamber 47 moves up and down. In this manner, an extrusion member 66 that pushes the pulp suspension in the storage portion 36 to the papermaking net 71 is installed near the upper portion of the overflow side wall 43, and the extrusion member 66 overflows with the extrusion member 66. Since the overflow channel formed between the side wall 43 and the side wall 43 is relatively close to and spaced from the overflow side wall 43, the flow rate of the pulp suspension overflowing above the overflow side wall 43 is increased. Change occurs. Due to this speed change, the pulp suspension supplied to the papermaking net 71 can be made uniform with no bias.

And since the pushing member 66 is provided with the pushing up inclination part 93 which faced the up inclination part 41 and inclined to the up inclination, the up inclination part 41 and the extrusion up inclination part 93 are maintaining the inclination posture. Since they are relatively close to each other, the flow rate of the pulp suspension that overflows above the overflow side wall 43 can be changed more efficiently.

Further, since the pushing member 66 is moved closer to and away from the overflow side wall 43 as the stirring plate moving part 54 moves back and forth, the stirring plate moving part 54 moves the stirring plates 53a and 53b and the pushing member 66 efficiently. can do.

While the pulp suspension in the storage unit 36 is overflowing, the control unit 8 continues the raising and lowering operations of the stirring plates 53a and 53b and the pushing member 66 by the stirring plate moving unit 54. By stirring the stirring unit 55, the stirring plates 53a and 53b are reciprocated in the vertical direction while maintaining a substantially horizontal posture, whereby the liquid level of the pulp suspension stored in the first chamber 46 and the second chamber 47 is obtained. Move up and down. Thereby, a wave is generated in the liquid level of the pulp suspension supplied from the storage part 36 onto the papermaking net 71.

Further, the pulp suspension in the storage portion 36 is pushed out to the papermaking net 71 by the vertical movement of the pushing member 66. By the operation of the pushing member 66, a wave different from the wave generated by the vertical movement of the stirring plates 53a and 53b is generated. FIG. 9 schematically shows a state where both waves are generated. Then, both the wave generated by the pushing member 66 and the wave generated by the stirring plates 53a and 53b repeatedly cover the pulp received by the papermaking net 71 from above. Therefore, since the pulp suspension is supplied on the papermaking net 71 at a uniform pulp concentration, the quality of the obtained paper 7 can be further improved.

The pulp suspension supplied on the papermaking net 71 passes through the mesh, and is guided to the lower water receiving part 72 by the sliding contact member 74 and received by the water receiving part 72. Housed in a tank. The white water in the white water tank is sent to the pulp manufacturing unit 1, the deinking unit 2, etc., and used again. The pulp remaining on the papermaking net 71 becomes the wet paper 9 which is a fiber layer containing a relatively large amount of moisture.

When the wet paper 9 on the papermaking net 71 reaches the end of the forward path, it is transferred to the water absorption belt 78a on the upper side of the press part 13. Thereafter, the water is sandwiched between the lower water absorption belt 78b and dehydrated by absorbing the moisture contained in the wet paper 9 to the water absorption belts 78a and 78b, and further squeezed by the squeezing roller 79 and dehydrated.

The wet paper 9 dehydrated by the press unit 13 is sent to the drying unit 14 and is sandwiched between a pair of upper and lower drying belts 84 that travel. Then, the wet paper 9 is dried by transporting the wet paper 9 to the plurality of drying rollers 83 that are heated by the heater 85 and maintained at a predetermined temperature via the drying belt 84, and the paper 7 before finishing is dried. Get.

The unfinished paper 7 exiting the drying unit 14 is passed between a plurality of press rollers 87. As a result, the flatness of the paper 7 before finishing is improved, and the paper 7 is completed by cutting into a predetermined sheet size with a cutting blade.

In the above-described embodiment, the push-up inclined portion 93 inclined to the upward gradient is provided on the push member 66 so as to face the upward inclined portion. However, the push-up inclined portion may not be provided.

In addition, the overflow side wall 43 is provided with the down slope part 42 adjacent to the downstream side of the up slope part 41, but the down slope part may not be provided. In addition, the storage unit 36 includes the stirring unit 55, but the stirring unit 55 may not be provided. Further, the pushing member 66 is moved closer to and away from the overflow side wall 43 in accordance with the reciprocating operation of the stirring plate moving unit 54. However, the pushing member 66 is moved closer to and away from the overflow side wall by another mechanism. May be. In addition, the pushing member 66 has moved so that the upper end portion is between the same level as the liquid level of the pulp suspension overflowing from the storage portion 36 and a position lower than the liquid level. May protrude to a position higher than the liquid level of the pulp suspension, and the protruding state may be maintained at a position higher than the liquid level even when the pushing member approaches the overflow side wall.

Moreover, although the storage part 36 was divided back and forth by the partition wall 44 arrange | positioned in the hollow height position along the width direction, it is not necessary to necessarily provide the partition wall 44 and the storage part is by one storage tank. It may be formed. The partition wall 44 is provided at the hollow height position so that the lower portion of the first chamber and the second chamber communicate with each other. However, the partition wall may be erected on the bottom plate to communicate with the upper portion.

S Paper machine 11 Head box 34 Overflow side wall 36 Reservoir 41 Upward inclined part 42 Downward inclined parts 53a, 53b Stirring plate 54 Stirring plate moving part 55 Stirring part 66 Extruding member 71 Papermaking net 93 Extruding upward inclined part

Claims (6)

A storage section for storing the pulp suspension;
In the vicinity of the upper part of the overflow side wall of the pulp suspension of the storage part, an extrusion member that pushes the pulp suspension in the storage part into a papermaking net is installed,
2. The head box according to claim 1, wherein the extruding member repeatedly reciprocates so as to expand and contract an overflow channel formed between the extruding member and the overflow side wall. The head box according to claim 1, further comprising an ascending inclined portion inclined in an ascending gradient on the overflow side wall. The head box according to claim 2, wherein the extruded member is provided with an extruded upward inclined portion inclined in an upward gradient so as to face the upward inclined portion. The head box according to any one of claims 1 to 3, wherein the overflow side wall is provided with a downwardly inclined portion inclined in a downward gradient adjacent to a downstream side of the upwardly inclined portion. . The head box according to any one of claims 1 to 4, wherein the storage unit includes a stirring unit that stirs the pulp suspension stored therein. The stirring unit includes a stirring plate and a stirring plate moving unit that reciprocally moves the stirring plate,
6. The head box according to claim 5, wherein the push-out member is moved closer to and away from the overflow side wall in accordance with the reciprocating operation of the stirring plate moving unit.

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