JPH03193990A - Dryer apparatus - Google Patents

Abstract

PURPOSE:To obtain the subject apparatus capable of alternately drying a sheet from both surfaces thereof and providing paper of good quality with hardly any difference between both surfaces by alternately providing felt runs on the upper and lower sides and further two guide rolls in the form of S in connecting parts of dryer roll groups. CONSTITUTION:Felt runs for continuously running a felt 4 while supporting the felt 4 with felt rolls 5 are initially and alternately provided on the upper and lower sides so as to support a sheet 1 in a single felt run dryer of a paper machine. Further, two guide (suction) rolls 3 and (3a) capable of regulating floating of the sheet 1 are arranged in the form of S in connecting parts of the groups of dryer rolls 2. Thereby, when the sheet 1 in which one surface thereof 6 is dried in a dryer roll group (A) is transferred to a dryer roll group (B), the lower felt run of the roll group (B) takes overt the support of the sheet 1 from the upper felt run of the roll group (A) to turn the surface 6 of the sheet 1 upside down with the guide roll (3a). The other surface 7 of the sheet 1 is then dried with the dryer rolls 2 of the roll group (B).

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a dryer device that can be used as a drying means in a single felt section for double-sided drying in a paper machine.

(Prior Art) In a conventional dryer device, the single felt section has four groups of drying rolls A to D consisting of a dryer roll 2 and a suction roll 3, as shown in the example shown in Fig. 3, in a no-oven draw type. The sheet (wet paper) 1 is supported by a felt 4 and dried, and the fifth and subsequent groups (not shown) are dried in an oven draw type using a top dryer and a bottom dryer using a double felt.

Here, in the structure of the conventional single felt section, since all the felt runs of groups A to D are arranged on the upper side as shown in the figure, the sheet 10 surface that comes into contact with the dryer roll 2 is always on the lower surface 8 and 6. However, the top surface 5 was not touched.

(Problem to be Solved by the Invention) As a structural problem of the single felt portion in the conventional dryer device, as described above, the 8
Since only the surface 6 contacts the dryer roll 2 and the sheet is dried only from one side, there will be differences in surface strength, smoothness, etc., and if a sheet with small differences between both sides is required, problems may occur. There were problems such as the occurrence of

The present invention aims to solve such conventional problems.

(Means for Solving the Problems) For this reason, the present invention provides a single felt run drying device for a paper machine, in which felt runs are provided alternately on the upper side and the lower side to prevent sheet floating at the connecting portion of the drying roll group. By arranging two guide rolls in an S-shape, the top and bottom surfaces of the sheet are turned over and brought into contact with the rolls, and drying is performed alternately from both sides of the sheet. It is intended as a means to achieve this goal.

(Function) In the dryer device, the sheet is dried from the a side by the dryer roll in the upper felt run of the drying roll A group, and passes through the suction roll while stably holding the sheet through the felt, but the sheet is dried by the drying roll 8 When moving to the group, the lower felt run of Group B inherits sheet support from the upper felt run of Group A, the A side of the sheet is reversed by the suction roll, and the B side of the dryer roll of Group B contacts the same roll. and dried.

(Embodiment) The present invention will be described below with reference to embodiments of the drawings. FIG. 1 is a side view showing the general configuration of the present invention, and FIG.
An enlarged view of the part is shown.

In the conventional configuration shown in FIG. 3, the dryer rolls 2 of each group A to D are
was connected to adjacent groups of dryer rolls 2 via one suction roll 3, but in the present invention, as in the embodiments of FIGS. 1 and 2, a suction roll 3a is provided at the connection part, This and a suction roll 3 arranged in an S-shape are arranged, and the felt is supported by the felt roll 5 and continuously runs on the roll surfaces of the dryer roll 2 and suction roll 3 while supporting the sheet l. Runs are also provided on the lower side, and felt runs are alternately arranged on the upper and lower sides.

In the double-sided drying single felt run dryer having the above configuration, the sheet 1 is dried from 8 sides 6 by the dryer roll 2 on the upper felt run in the drying roll group A, and the sheet is stabilized by the suction roll 3 through the felt 4. However, as shown in FIG. 2, when moving to drying roll group 8, the lower felt run of group B receives support for sheet 1 from the upper felt run of group A, and the sheet is removed by suction roll 3a. The 8 sides 6 of 1 are inverted, and the 5th side 7 of group B is dried on the dryer roll 2 in contact with the same roll.

In this way, when moving from group B to group 0, the sheet surface is reversed by the upper felt run via the suction roll 3a, and 8 surfaces 6.5 surfaces 7 of the sheet 1 are sequentially brought into contact with the dryer roll 2 alternately. and dried. The suction roll 3.3a may also be a felt roll with circumferential grooves. Note that the present invention is not limited to the above-mentioned embodiments, and various changes may be made without departing from the gist of the present invention.

(Effects of the Invention) As described above in detail, according to the dryer device of the present invention, drying is performed alternately from both sides of the sheet, so that high-quality paper with little difference between both sides of the sheet can be obtained.

[Brief explanation of drawings]

FIG. 1 is a side view of a dryer device showing an embodiment of the present invention;
FIG. 2 is an enlarged view of section E in FIG. 1, and FIG. 3 is a side view showing an example of a conventional dryer device. Explanation of the main parts of the diagram l...Sheet 2...Dryer roll 3.3a...-Suction roll 4...Felt 5...Felt roll

Claims (1)

[Claims] In a single felt run drying device for a paper machine, felt runs are provided alternately on the upper and lower sides, and two guide rolls are arranged in an S-shape at the connection part of the drying roll group to prevent sheet floating. A dryer device characterized in that the top and bottom surfaces of a sheet are turned over and brought into contact with a roll, and drying is performed alternately from both sides of the sheet.