JPS588799Y2 - Wet paper relay device from press part to dry part in paper making machine - Google Patents

Description

[Detailed description of the invention] This invention is designed to prevent vertical wrinkles from forming in the wet paper that is peeled off from the press roll with a doctor, moved to the dry part, and dried in this machine. Concerning a wet paper relay device to a part-time job.

As is well known, in paper making equipment, the wet paper pressed in the press part is peeled off from the press roll with a doctor, lifted into the air and transferred to the top felt band wrapped around the overhanging roll, and the top felt band is applied to the surface of the dryer cylinder. It is designed to be wear resistant and dry.

Generally, the thickness of paper-made wet paper is not uniform in the width direction,
The wet paper that has been removed by the doctor still contains sufficient moisture and is heavy, so it is pulled up into the air to be transferred to the top felt band, and is locally tensioned in the width direction. The part that is in contact with the top felt band tightly, but if there is an air layer between the part that is not so tensioned and the top felt band, this will cause the top felt band to come into contact with the dryer cylinder and dry. Vertical wrinkles may appear between the image areas.

Of course, the occurrence of such vertical portions can be reduced to some extent by adjusting the properties, density, etc. of the paper stock, but in general, the generation of vertical portions is reduced by increasing the speed per second, which allows the paper to be peeled off from the press roll. The more the tension of lifting the wet paper into the air to transfer it to the top felt group increases, the more this phenomenon occurs.

Therefore, in the present invention, a relay roll is placed in the air between the press roll and the front end of the top felt band, and the wet paper that has been peeled off by the press roll is transferred to the top felt band via the relay roll. The wet paper paper is lightly pressed onto the front end of the top felt band using a presser roll that can be rotated lightly in the center to reliably prevent the occurrence of wrinkles. Explain with reference to.

1 is a paper making section, 2 is a wet felt band, and 3 is a press part. The wet paper paper formed in the paper making section 1 is conveyed to the press part 3 by the wet felt band 2.

The press part 3 consists of upper and lower press rolls 3a and 3b, and the wet paper conveyed by the wet felt band is dehydrated under pressure by the upper and lower press rolls 3a and 3b, adheres to the upper press roll 3a, and is removed from the wet felt band 2. It is separated and peeled off from the upper press roll 3a by the press doctor 4.

5 is a dryer cylinder; 6 is a top felt band; the top felt band lifts the wet paper peeled off from the upper press roll into the air and transfers it onto the dryer cylinder 50;
The wet paper web is subjected to a drying action by being pressed against the peripheral surface, and its front end is stretched over an overhang roll or a tenth roll 6a installed below the front of the dryer cylinder 5.

Now, in the present invention, the upper press roll 3a and the 10th roll 6a
A relay roll 7 is arranged between the front ends of the top felt band 6 stretched over the top felt band 6, and the lower side of the wet paper that is peeled off from the upper press roll and pulled up to the front end of the top felt band 6 is applied to the relay roll I. The wet paper paper that is about to leave the relay roll 7 and transfer to the front end of the top felt band 6 is pressed onto the front end of the top felt band by the lightly rotating presser roll 8.

The relay roll 7 that can be used in the present invention is preferably one that can apply a force in the width direction to the wet paper web attached to it, such as an expander roll or a worm roll, but in some cases, an outer cylinder that does not have the ability to apply such force It may be a cylindrical roll with a smooth surface.

Further, the presser roll 8 has bearing devices 9, 9 facing each other at each end.
One end of each arm 11 is fixed with a set screw 10' to both ends of a support shaft 100 which is rotatably installed horizontally, and a shaft 12 is installed between the other ends of both arms 11, 11 with a set screw or the like.
It is sufficient if it is supported on this shaft 12.

In this embodiment, the presser roll 8 is made of a cylindrical hollow pipe, with bearings 13 mounted inside both ends thereof, and the shaft 12 passing through the center of both bearings 13, 13 and penetrating the inside of the hollow pipe. .

The presser roll 8 rotates the support shaft 10 relative to the bearings 9, 9, and uses its own weight to press the wet paper web S from above.The presser roll 8 rotates around the 10-rule 6a from below as shown in FIG. It may be at the front end of the top felt band, or it may be at a location a little forward from the 10th rule 6a as shown in FIG.

In addition, in order to optimally adjust the position where the presser roll 8 presses the wet paper from above, each arm 11 is composed of a front arm 11a and a rear arm 11b, and a long hole 11' is formed in one of them (the front arm in the drawing). A bolt is passed through this to connect it to the other arm (rear arm) so that it can be expanded and contracted.

Furthermore, when a paper break occurs at the start of operation or during operation, the tip of the wet paper peeled off from the upper press roll 3a by the doctor 4 is manually hung on the front end of the top felt band 6 to facilitate paper passing. , the gripping rod 14 is provided between the left and right arms IL11 (in this embodiment, the rear arms 11b and 1lb), and the left and right arms 11.11 are held while holding the gripping rod 14 with their hands.
is raised together with the support shaft 10 so that the presser roll 8 can be placed apart from the top felt band 6.

15a is a pin fixed radially to each end of the support shaft 10;
15b is a pin provided in the axial direction of each bearing device 9, which has a gripping rod 14 and rotates the support shaft 10 to open the arm 11.11.
When the arm is raised on its back, the pin 15a is received by the pin 15b and constitutes a stopper 15 that holds the arm 11.11 in the (-'l) position (FIG. 5).

When the paper threading operation is completed, the holding rod 14 is held in the hand and turned in the opposite direction to lower the presser roll.

As is clear from the above, according to the present invention, the top felt band pulls the wet paper peeled from the upper press roll 3a into the air via the relay roll 7.

For this reason, the wet paper web peeled off from the upper press roll is suspended on the relay roll 7 and is tensioned between this S and the top felt band 1, and the distance over which it is tensioned in the air is shorter than when it is directly pulled up from the conventional upper press roll. It is significantly shortened and therefore only has slight sag in the width direction which would cause longitudinal wrinkles.

Moreover, the presser roll 8 presses the top felt band lightly and spreads it uniformly in the width direction, so even if there is a slight slack in the width direction between the relay roll 7 and the front end of the top felt band, the presser roll 8 It disappears and does not create vertical edges in the paper dried in the dryer cylinder.

Since the presser roll 8 is supported on the shaft 12 by bearings 13, 13, it is rotated by friction in the center of the wet paper, and accidents such as cutting the wet paper do not occur.

Further, since the arm 11.11 can be raised on its back by rotating the support shaft 10 and received by the stopper 15, the presser roll does not become an obstacle to the paper passing operation.

Further, in this embodiment, the two rolls or one of the rolls, which are frictionally rotated by the relay roll 11 and the presser roll 8 due to the mixed phase, may be actively rotated by power.

[Brief explanation of the drawings] Fig. 1 is a schematic side view of the entire paper making machine using the device of the present invention, Fig. 2 is a plan view of an embodiment of the presser roll support device, and Fig. 3 is a schematic side view of the entire paper making machine using the device of the present invention. 4 is a side view of another state in which the wet paper is being held down, and FIG. 5 is an enlarged side view of the supporting device in the upright position. The upper top roll, 4 is a doctor, 5 is a dryer cylinder, 6 is a top felt band, 7 is a relay roll, and 8 is a presser roll.

Claims (1)

[Claim for Utility Model Registration] A relay roll is arranged between the press roll and the front end of the top felt band, and the wet paper peeled from the press roll is pulled up onto the front end of the top felt band via this relay roll, and then the dryer cylinder In the wet paper relay device from the press part to the dry heart in a paper making machine where the wet paper is guided to dry by drying, a support shaft is rotatably mounted horizontally on the rear upper part of the front end of the top felt band with bearings facing each other. A rear arm is attached to each end of the back arm, and a front arm is attached to the front of each rear arm, which can be adjusted by expanding and contracting the length of the protrusion from the rear arm. A presser roll that can be contacted is installed, a gripping rod is installed between the rear arms, and the support shaft is rotated between the end of the support shaft and the bearing to raise the pair of arms (front and rear arms) on their backs. A wet paper transfer device from a press part to a dry part in a paper making machine, characterized in that it is provided with a stopper for holding it in a fixed position.