JPH072640Y2 - Paper machine slices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a slice of a paper machine that continuously supplies a raw material onto a running endless paper making net.

[Prior Art] Generally, in high-concentration papermaking, dispersion is poor and strength in the flow direction is difficult to obtain, but in order to obtain paper that is uniform in the width direction and high in the longitudinal direction, the fibers in the raw material (paper stock) It is necessary to disperse the fibers so as not to bind them (flock them) and arrange the fibers along the flow direction.

Therefore, in the conventional head box (Japanese Patent Laid-Open No. 55-93895), a plurality of raw material distribution pipes b are provided in parallel in the head box a as shown in FIG. c are individually inserted so that a swirl flow is applied to the raw material in the raw material distribution pipe b, and the raw materials exiting the raw material distribution pipe b are merged and disturbed each other, and jetted from the slice outlet d onto the papermaking machine e. Was configured. According to the slicing device having such a configuration, when a normal low-concentration raw material is supplied,
The fibers in the raw material are sufficiently dispersed, uniformly supplied in the width direction on the paper making machine e, and arranged in the transfer direction.

[Problems to be Solved by the Invention] By the way, in the above slice, when a high-concentration raw material is supplied, the flow rate in the head box a naturally decreases, but in order to perform sufficient diffusion, It is necessary to greatly increase the passing flow velocity in the distribution pipe. However, if the flow velocity in the raw material distribution pipe is significantly increased, the raw material is turbulent after leaving the raw material distribution pipe b, and streaks are likely to occur. Therefore, the flow velocity cannot be significantly increased and the raw material is dispersed. There was a problem of unevenness or insufficientness.

Further, when the pipe diameter is reduced to reduce the degree of turbulence, there is a problem that the raw material is clogged in the raw material distribution pipe b. In particular, when the inside of the raw material distribution pipe b was clogged, cleaning was difficult.

The present invention has been made to solve the above-mentioned problems of the prior art, and the purpose thereof is to give a sufficient swirling flow to disperse even a high-concentration raw material. Another object of the present invention is to provide a slice of a paper machine which is capable of producing highly homogeneous paper having high strength in the longitudinal direction and is easy to clean.

[Means for Solving the Problems] In order to achieve the above object, the present invention is to form a wide hollow nozzle-shaped slice for supplying raw material on a paper making machine so that it can be expanded in the vertical direction, and these upper and lower slices can be expanded. On the inner surface of the component piece, rectifying plates inclined in the slice width direction are provided so as to alternately mesh with each other at appropriate intervals in the slice width direction from above and below, and the free end of each rectifying plate and the upper or lower slice component piece inner surface. A predetermined gap is provided between the rectifying plates, and a twisting plate portion that gives a swirling flow to the raw material is provided at the rear end of each straightening plate facing the slice outlet.

[Operation] The raw material is straightened by the straightening plate and accelerated in the nozzle-shaped slice, and then the swirling flow is directly applied by the twisting plate portion. Since the swirling flow is not regulated by a pipe or the like, adjacent swirling flows interfere with each other to sufficiently disperse the raw material.

In particular, since the straightening vanes are inclined in the slice width direction, the pitch in the slice width direction of the twisted plate portion can be narrowed, and swirling flows can easily interfere with each other, further increasing the degree of dispersion in the left and right directions and the raw material concentration. Streak is prevented regardless of the height of the.

In addition, if the free end of the straightening vane has a gap between the upper and lower divided pieces of the slice, the raw material that passes through these gaps can secure a flow, stir the base region of the straightening vane, and retain and adhere the raw material. Is prevented.

In addition, since the upper rectifying plate provided on the upper slice component and the lower rectifying plate provided on the lower slice component are meshed with each other from above and below, the slice is referred to as the upper slice component during cleaning and inspection. Alligator-like opening to the lower slice component effectively doubles the pitch of the baffles to be cleaned. That is, in the normal rectifying plate, even if the interval between the adjacent rectifying plates is set to be narrow in a normal use state,
Since the space between adjacent straightening vanes can be widened when cleaning,
Both the rectifying action during use and the work of removing adhered substances during cleaning can be achieved.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 is a slice of a head box of a paper machine, a raw material inlet 2 is formed at a base end portion thereof, and a raw material is supplied onto a paper making net 4 wound around a roll 3 at a front end portion thereof. A slice outlet 5 is formed. This slice 1
Is divided into upper and lower parts, and these slice components (hereinafter referred to as slice lips) 1a and 1b are attached such that the upper slice lip 1a can be expanded like a crocodile mouth by a hinge 6 with respect to the lower slice lip 1b. ing. In addition,
The upper slice lip 1a is fixed to the lower slice lip 1b by a jack or the like so that its position can be adjusted. The left and right side plates of slice 1 are these upper and lower slice lips 1a, 1b.
The seal member is fixed to either one of the above, and a seal member for preventing leakage of the raw material is provided between the other and the other (not shown).

As shown in FIGS. 2 and 3, straightening vanes 7 and 8 along the flow direction of the raw material are alternately provided at appropriate intervals in the slice width direction on the inner wall on the inlet 2 side of the upper and lower slice lips 1a and 1b of the slice 1. Further, a twisting plate portion 9 for giving a swirl flow to the raw material is formed at the wake ends of these straightening vanes 7 and 8 facing the slice outlet 5. In the embodiment, upper and lower two parallel strips are formed at the wake ends of the straightening vanes 7 and 8, and twists are applied to the strips so that two twisting plate members 9 are provided to the straightening vanes 7 and 8. Has been formed. The number of the twisted plate portions 9 is not limited,
As shown in the figure, there may be three each. Also, the twisting direction of the twisting plate portion 9 is appropriately selected.

The straightening vanes 7 and 8 are attached at a predetermined angle θ in the width direction in order to increase the degree of dispersion in the slice width direction. The free ends 7a, 8a of the straightening vanes 7, 8 are the upper and lower slice lips 1a, 1b.
However, in the embodiment, a gap 10 is set between the free ends 7a, 8a of the straightening vanes 7, 8 and the inner walls of the upper and lower slice lips 1a, 1b.

According to this structure, the raw material introduced into the slice 1 from the inlet 2 is rectified by the rectifying plates 7 and 8 and is accelerated in the nozzle-shaped slice 1 and then the efficiency is increased by the twisting plate portion 9. A swirl flow is often given. These swirling flows interfere with each other next to each other and are complicatedly disturbed in the three-dimensional direction. Therefore, even in a high-concentration raw material, the fibers in the raw material can be sufficiently dispersed, and the paper-making net 4 from the slice outlet 5
The floc-free raw material can be supplied uniformly in the width direction and with the fibers aligned in the transfer direction. This makes it possible to manufacture paper that is uniform in the width direction and has high strength in the longitudinal direction.

Since the straightening vanes 7 and 8 are provided in the slice 1 in an inclined manner, the pitch of the twisted plate is reduced in the slice width direction, streaks are prevented, and the quality is improved. Further, if the free ends of the straightening vanes 7 and 8 have a gap 10 between the upper and lower slice lips 1a and 1b of the slice 1, the flow of the raw material through the gap 10 between the free end and the slice lips 1a and 1b. It is possible to prevent the occurrence of streaks due to the raw material clogging the gap 10.

Further, in the slice 1, the upper slice lip 1a can be expanded with respect to the lower slice lip 1b around the hinge 6, and when the straightening vanes are respectively arranged from above and below, the straightening vane pitch at the time of widening is increased. As it becomes wider, the raw material is a straightening plate 7,8
Even if it adheres to the twisting plate portion 9 or the like, the adhered matter can be easily cleaned. That is, even if the distance between the adjacent straightening vanes 7 and 8 is set to be narrow in a normal use state, the straightening vanes 7 and 8 are substantially adjacent to each other during cleaning and inspection.
Since the distance between the two becomes wide, it is possible to achieve both the rectifying function during use and the work of removing adhered substances during cleaning. Also, inspections and the like become easy.

[Effect of the Invention] In summary, according to the present invention, the following excellent effects are exhibited.

The raw material flowing in the slice is rectified by a plurality of rectifying plates that are inclined in the slice width direction, and after accelerating in the slice formed on the nozzle, the twisted plate portion efficiently gives a swirling flow to adjoin Since the swirling flows interfere with each other, the fibers in the raw material can be sufficiently dispersed, and the high-concentration raw material is not streaked in the width direction on the paper making net,
Moreover, the fibers in the raw material can be supplied so as to be aligned in the transport direction, and it is possible to obtain paper that is uniform in the width direction and has high strength in the longitudinal direction.

Further, since the upper straightening plate provided on the upper slice component and the lower straightening plate provided on the lower slice component are meshed with each other from above and below, the slice is sliced into the upper slice component during cleaning and inspection. Alligator-like opening to the lower slice component and the bottom slice component substantially doubles the pitch of the baffles to be cleaned. Therefore, it is possible to achieve both the rectifying action during use and the deposit removal work during cleaning.

In addition, since a predetermined gap is provided between the free end of each straightening vane and the inner surface of the slice constituent piece above or below, it is possible to secure the flow of the raw material between the free end of the straightening vane and the inner surface of the slice constituent piece. That is, the flow velocity in the gap can be maintained, and the raw material can be prevented from adhering and accumulating in this portion.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of an essential part thereof, FIG. 3 is a sectional view taken along the line A--A of FIG. 2, and FIG. A side view showing a modified example in which there are three, fifth
The figure is a side sectional view showing a conventional slice. In the figure, 1 is a slice, 1a is an upper slice lip, 1b is a lower slice lip, 4 is a net, 7 and 8 are straightening plates, 9 is a twist plate portion, 10 is a gap, and θ is an inclination angle.

Claims (1)

[Scope of utility model registration request] 1. A wide hollow nozzle-shaped slice for supplying a raw material onto a papermaking machine is formed so as to be capable of expanding in the vertical direction, and straightening plates inclined in the slice width direction are formed on the inner surfaces of the upper and lower slice constituent pieces. Provided so as to alternately engage with each other from above and below at appropriate intervals in the slice width direction, a predetermined gap is provided between the free end of each straightening vane and the upper or lower slice constituent piece inner surface,
A slice of a paper machine, wherein a twisting plate portion that gives a swirling flow to the raw material is provided at the rear end of each straightening plate facing the slice outlet.