JPS6126397Y2 - - Google Patents

Description

[Detailed description of the invention] An example of a dryer for a conventional paper machine is explained with reference to FIG. 1. The dryer 1 is made of cylindrical cast iron;
It is a hollow roll whose both ends are closed by end plates 2, into which steam 3 is supplied and its heat dries the paper 4 on the surface. Further, the central shaft portion of the end plate 2 is supported by a bearing 5, so that the dryer 1 can rotate. A large number of these dryers 1 are connected to form a dryer part, and the paper 4 is sequentially passed along the outer peripheral surface of these many dryers 1 and dried.

Further, at the end of the roll shaft, a steam supply pipe 6 and a drain discharge pipe 7 are connected to an internal steam supply pipe 9, a siphon pipe 10, and a drain discharge hopper 11 via mechanically sealed rotary joints 8, respectively. It is connected to the.

Now, when the dryer roll rotates at high speed, the drain 12 generated as the steam 3 loses heat to the paper 4 forms a drain film with a substantially uniform thickness on the inner surface of the roll cell, causing a so-called rimming phenomenon. This drain 12 is sucked up from the hopper 11 and discharged to the outside through the drain discharge pipe 7.

However, in the dryer roll of FIG. 1, although the temperature inside the dryer is constant, the temperature distribution outside the dryer is not uniform. That is, the temperature at both ends of the dryer is generally high, and the temperature at the center is lower than at both ends.

Therefore, both ends of the paper 4 dry well, but the center part dries more slowly than both ends, resulting in uneven drying. Especially when the paper width is wide, there are also differences in the temperature of the surrounding atmosphere, air flow, and surface temperature of the dryer roll, so it is difficult to obtain a uniform moisture distribution in the width direction of the paper after the paper reaches its finished state. It was a long time ago.

As mentioned above, the reason why the temperature at both ends of the dryer roll is higher than that at the center is that the heat of the end plate 2 of the central shaft supporting the dryer roll is transmitted to both ends of the roll cell 1. Conceivable. Therefore, as a result of intensive research, the inventor of the present invention cut the roll cell from the end near the front where the paper was passed through.
If a heat insulating material is inserted into this part and tightened with bolts to form the original dryer roll, the heat transfer from the end plate will be suppressed by the insulator, and the heat generated by the high temperature at the end of the roll cell will be suppressed. The present invention was achieved by discovering that the temperature distribution of the dryer roll becomes uniform when there is no conduction.

That is, the present invention makes the temperature distribution of the roll cell uniform by interposing and integrating a ring-shaped material with low thermal conductivity near both ends of the roll cell in the dryer roll, and the paper that is in contact with the surface of the roll cell is made uniform. Please provide a uniform drying device for a dryer that can obtain uniform moisture distribution when the finished product is finished.
This is what we do.

The embodiment of the present invention will be explained below with reference to the drawings. Fig. 2 shows a cross-sectional view of a part of the roll cell of the dryer 1 showing the embodiment of the present invention, except for the structure of both ends of the roll cell. , otherwise the structure is the same as that of the dryer shown in FIG.

In FIG. 2, the dryer 1 is cut and separated at both end portions 13, 13 of the roll cell and the main body 14 at the center.
Between the two ends 13, rings of material 15, 15 having low thermal conductivity are interposed, and the two ends 13, 13 are joined together by fastening them with bolts 16, 16 from the outside.

As explained in detail above, in the present invention, a ring-shaped material with low thermal conductivity is interposed between both ends of the roll cell and the main body of the roll cell, and these are joined together. Even if the heat from the end plate of the roll is transferred to both ends of the roll cell,
The heat transferred to the end plate portion is suppressed by the ring-shaped material with low thermal conductivity, and it is difficult for all of that heat to be transferred to the main body at the center of the roll cell. Therefore, the temperature of the roll cell in the portion where the paper or the like that is in contact with the surface of the roll cell is made uniform, and a uniform moisture distribution can be obtained in the finished state of the paper or the like. Although the above explanation has been given using a paper machine as an example, the present invention can be applied not only to a paper machine but also to other general dryers.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an example of a dryer roll of a conventional paper machine, and FIG. 2 is a side sectional view of a portion of a roll cell of a dryer showing an embodiment of the present invention. Explanation of the main parts of the diagram, 1... dryer, 4...
Paper, 13... End plate portion, 14... Main body, 15...
Ring-shaped material with low thermal conductivity, 16...volts. 〓〓〓〓〓

Claims (1)

[Scope of utility model registration request] A dryer roll characterized in that a ring-shaped material with low thermal conductivity is interposed between both end portions of the roll cell and the main body of the roll cell, and these are integrally connected. Uniform drying equipment.