JPH03364Y2 - - Google Patents

Description

[Detailed Description of the Invention] Figs. 1 to 6 schematically show the configuration of a web processing device for forming kraft stretched paper in a conventional paper machine. The web processing equipment that forms kraft stretched paper is also called an extendible unit, and it presses a nip bar onto a dryer roll through a blanket, and then adheres the wet paper to the stretched blanket at this crimping position to produce the same moisture content. The paper is transferred between the blanket and the dryer roll, and as the blanket comes out of the nip bar and the dryer roll and shrinks, the wet paper also shrinks and is processed into kraft stretched paper (the paper is finely processed on a web processing device). It produces paper with excellent impact resistance and stretchability obtained by shrinking the paper.

FIG. 1 is a side view showing an example of a conventional web processing apparatus for forming kraft stretched paper, in which a chrome plating dryer 1, a blanket roll 2, a nip bar 3, a blanket 4, and a paper dryer 6 are arranged as shown. It has been done. Blanket 4 is made of endlessly woven fabric covered with soft rubber.
It is held by a plurality of blanket rolls 2 to form a continuous ring, and is compressed between a nip bar 3 and a chrome-plated dryer 1 to form a nip part, and its thickness is, for example, 20
mm to 25mm.

Now, as shown in FIG. 3, the outer periphery of the blanket rubber layer 4a is pressurized by the chrome plating dryer 1 and the nip bar 3, and the nip portion 7 formed by the nip bar 3 and the chrome plating dryer 1 is pressed by the arrow 16. It is extended in the direction of the torus, as shown in the figure. On the other hand, the sheet 5 is caught by the blanket rubber layer 4a, and after passing through the nip 7, the blanket rubber layer 4a runs along the outer circumference of the chrome-plated dryer 1 and returns to its original length due to its elasticity. The blanket rubber layer 4a forms a kraft stretch paper.

At this time, as shown in FIG. 2, in order to lubricate between the fixed nip bar 3 and the moving blanket 4, water is sprayed from above through a lubricating water pipe 9 having a plurality of water sprinkling holes 10, and a pond 8 is formed. Ru. Since the conventional nip bar 3 is formed of a pipe and does not have a water volume adjustment function, the depth of the pond 8 is determined by controlling the volume of lubricating water supplied. Furthermore, there are edge pans 11 shown in FIG. 4 at both ends of the pond 8, and an air curtain is formed with an air jet 12 to seal the pond. It is received and drained.

Further, to explain another conventional nip bar device in FIGS. 5 and 6, FIG. 5 is a partially cutaway perspective view of a conventional web processing device for forming kraft stretch paper, which is different from that shown in FIG. 1. What is different from the conventional device shown in FIGS. 1 to 4 is that, as shown in the front view of FIG. The hole 13 is drilled, and the nip bar 15 itself has a drainage function. However, in this case, the excess lubricating water that is supplied enters the interior of the nip bar 15 through the drain hole 13 and is drained by gravity from the drain pipes at both ends. Even if the height position of the nip bar is changed, the liquid level will not become lower than the height of the nip bar drain hole 14. In addition, the liquid level in the pond 8 can be kept constant, and like the conventional device described above, the air jet 1
2. Although it is sealed with Edgepan 11, Edgepan 11 may not be used. Note that the edge pan 11 is not shown in FIG.

However, in a method in which the overflow of lubricating water is received by the edge pan 11 at the end, as in the conventional device, the edge pan 11 and the blanket 4 do not fit well, resulting in a large amount of leakage. For this reason, the leaked water also scatters on the sheet 5, significantly deteriorating the quality of the paper, and the leaked water scatters around, creating a poor working environment.

Further, even if the side sealing method is used in conjunction with the air jet 12, the leaked water will be scattered by air, resulting in the same drawback as described above. Therefore, as a measure to prevent the above-mentioned drawbacks, it is dangerous to drastically reduce the supply amount in order to reduce the amount of leakage because there is a risk of running out of lubricating water. Also, since Edge Pan 11 was used, it was difficult to check the lubricating water of lb. 8.

The above-mentioned conventional equipment had the disadvantage that the sealing between the edges of the edge pan and the blanket was poor, resulting in a lot of water leakage, causing the sheets to be partially re-moistened, resulting in a decrease in quality, and the leaked water scattering around. The present invention aims to improve this, improve the working environment, and obtain high-quality products.Furthermore, since conventionally there was a lot of water leaking from the sealing part, the amount of lubricating water supplied was adjusted. However, because of the edge pan, it was difficult to check the lubricating water in the pond.The present invention was proposed with the aim of improving this and improving operation and workability.

That is, in the present invention, a nip bar is crimped to a dryer roll through a blanket, a wet paper is bonded to the stretched blanket at this crimping position, and the wet paper is sandwiched between the blanket and the dryer roll and transferred. In a web processing apparatus in which the wet paper is shrunk at the same time as the blanket is removed from the crimped position between the nip bar and the dryer roll to form kraft stretched paper, the nip bar is constituted by a hollow tube, and the upper part of the nip bar is A lubricating water pipe with a large number of water sprinkling holes facing downward is installed on the circumferential surface of one side of the nip bar, from the bottom of both ends toward the center, and slanting upward to communicate with the hollow pipe of the nip bar. Drill a hole to
On both sides of the hollow tube of the nip bar, a water suction tube is attached, the outside of which is connected to a vacuum source, and the tip of which is bent inside the hollow tube to near the lower hole position at both ends of the slanted hole of the nip bar. , it is an object of the present invention to provide a web processing apparatus characterized in that an air jet is provided for sealing the pound by forming an air curtain at one end of the pound formed between one side of the nip bar and the blanket. .

In the above configuration, the water that was sprayed from the lubricating water pipe to form a pond is actively pumped through holes that are inclined from the bottom of both ends of the circumferential surface of the hollow nip bar toward the center. Water is absorbed inside the empty tube. A water suction pipe whose tip is bent close to the inner bottom of the hollow tube is attached to both side plates of the hollow tube, so water absorbed into the hollow tube flows from the tip of the water suction pipe to the inside of the hollow tube. Most of the water will be absorbed near the inner bottom, and the shape of the water level of the pond is such that the water level becomes lower towards both ends, and the amount of water is also small, so it is easy to seal with an air jet and overflow from the ends. Most of the lubricating water is gone.

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 7 to 11 show embodiments of the present invention,
In the figure, 1 is a chrome plating dryer, 2 is a blanket roll, 4 is a blanket, 5 is a sheet, 6 is a paper dryer, 8 is a pound, 9 is a lubricating water pipe,
10 is multiple watering holes, 12 is an air jet,
Since these are the same as conventional ones, their explanation will be omitted. Here, I will explain the differences from the conventional one.
21 is a nip bar, and 22 is a pipe. There are side plates 23 at both ends of the pipe 22, and the shaft portion 2
4 is provided.

The shaft portion 24 has a hole drilled in the axial direction into which a water suction pipe 25 is inserted. is installed in a sealed manner so that it is located slightly above the bottom of the pipe 22. Further, a plurality of suction holes 27 are formed in the circumferential surface of the pipe 22 on the side of the blanket 4 so as to be inclined from both ends toward the center.

Next, an embodiment of the suction hole 27 will be described with reference to FIGS. 8 to 11. First, in FIG. 8, a plurality of circular holes 27a are formed at an angle. Moreover, in FIG. 9, a plurality of oblique holes 27b are formed. In FIG. 10, a plurality of oblong holes 27c are formed in an inclined shape, and in FIG. 11, continuous holes 27d are formed in an inclined manner.

In the case of the suction hole 27 shown in FIG. 8, a circular hole 27a is formed at both ends of the pipe 22 so as to be inclined from the lower part toward the center. The water suction pipe 25 comes out from the shaft portions 24 at both ends and is connected to a vacuum source such as a press felt suction box in other processes such as a paper machine. In this way, the nip bar 21 with inclined holes on both end faces is constructed.

Next, the effect will be explained. The conventional nip bar 15 with horizontal drainage holes shown in FIG. 5 drains water by gravity.
The water level was at its lowest at the nip bar drainage hole 14, and the water level in the pond 8 was the same at both ends and the center, but in the embodiment shown in FIG. It is connected to a vacuum source by a source connecting member 28, and is connected to the water suction pipe 2 of the shaft portion 24.
Since the insertion hole 5 is also sealed, the water that was sprinkled through the water sprinkling hole 10 of the lubricating water pipe 9 to form the pond 8 is actively transferred to the pipe 22 through the suction hole 27.
The water absorption hole 2 of the water absorption pipe 25 has water absorbed inside and is located slightly above the bottom of the pipe 22 at both ends.
6, the water is absorbed almost to the bottom of the pipe 22, so the water level of the pond 8 is as shown in FIG. 7, and the water level becomes lower toward both ends. Since the amount of water is small, it is easy to seal with the air jet 12, and there is almost no lubricating water overflowing from the end.

Further, the functions of the nip bars 30, 31, 32 of each shape shown in FIGS. 9 to 11 are the same as described above. Note that the nip bar 21 with inclined holes on both end faces is fixed to the shaft portion 24.

Since the present invention is configured as described in detail above, there is almost no lubricating water leaking from both ends, and edge pans are not required. Furthermore, in the past, the sheet had to be partially re-moistened due to water leakage, but the present invention improves this and provides a high-quality product.
Furthermore, in the past, leaked water was scattered around, creating a poor working environment, but the present invention completely eliminates this problem, eliminates the need to adjust the lubricating water using a valve, and improves operability. Note that since the vacuum pressure is low, there is no need to prepare a vacuum source in particular, and an existing vacuum source such as a press felt suction box may be used.

[Brief explanation of drawings]

FIG. 1 is a side view showing an example of a conventional web processing apparatus for forming kraft stretched paper, FIG. 2 is an enlarged view of the main parts in FIG. 1, FIG. 3 is a perspective view of the same, and FIG.
The figures are a cross-sectional view from A to A in Fig. 2, Fig. 5 is a perspective view of a conventional Kurupakku device different from Fig. 1, Fig. 6 is a front sectional view of the same essential parts, and Fig. 7 is an embodiment of the present invention. FIG. 8 is a front sectional view of the same essential parts, and FIGS. 9, 10, and 11 each show a different implementation from FIG. 8. FIG. 3 is a front sectional view of an example nip bar device. Explanation of the main parts of the diagram, 1... Chrome plated dryer, 5... Seat, 8... Pound, 9... Lubricating water piping, 10... Watering hole, 21... Nip bar,
22...Pipe, 24...Shaft portion, 25...Water suction pipe, 26...Water absorption hole, 27...Suction hole.

Claims (1)

[Scope of utility model registration request] By crimping the nip bar to the dryer roll through the blanket, the wet paper is adhered to the stretched blanket at this crimping position, and the wet paper is transferred between the blanket and the dryer roll, and the blanket is attached to the nip bar. In a web processing apparatus in which the wet paper is shrunk by being removed from the crimped position with the dryer roll and simultaneously shrinks to form kraft stretched paper, the nip bar is constituted by a hollow tube, and the nip bar is configured with a hollow tube, and a web is inserted into the upper part of the nip bar so as to be directed downward. Lubricating water piping with numerous watering holes is installed,
In addition, a hole is formed on the peripheral surface of one side of the nip bar from the bottom of both ends toward the center, respectively, and slopes upward to communicate with the inside of the hollow tube of the nip bar. A water suction pipe connected to a vacuum source and having its tip bent close to the lower hole position at both ends of the inclined hole of the nip bar inside the same hollow tube is attached, and a water suction pipe is formed between one side of the nip bar and the blanket. A web processing device characterized in that an air jet is provided to create an air curtain at one end of the pound and seal the pound.