JP2002275782A - Shoe nip calender - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shoe nip calender which can adjust the width of a shoe in the paper-passing direction to change the nip retention time and nip pressure distribution of base paper. SOLUTION: In this shoe nip calender in which a shoe 6 of a shoe roll 2 is pressed to a hard roll 1 through a soft sleeve 5 to form a nip N the shoe 6 is divided into a fixed shoe block 6a and a movable shoe block 6b. The division face portion between the fixed shoe block 6a and the movable shoe block 6b is used as a slide guide 6c having a certain joint structure, and the movable shoe block 6b can be slid along the division face. The movable shoe block 6b is slid by the action of a hydraulic cylinder 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe nip calender for performing a process for imparting gloss to the surface of paper manufactured by a paper machine.

[0002]

2. Description of the Related Art Paper produced by a paper machine generally has a rough surface and is not suitable for the purpose of use.

[0003] As shown in FIG. 3, a shoe nip calender, which is one of devices for applying glossy processing to the surface of the base paper, includes a hard roll 1 such as a metal roll as a heating roll and a shoe roll. The base paper 3 is passed through a nip N formed between the roll 2 and the shoe roll 2 which faces the hard roll 1. The shoe roll 2 is fixedly arranged in the roll axis direction. A soft sleeve 5 made of an elastic body rotatably arranged via a guide (not shown) on the outer periphery of the soft roll 5 and formed between the hard roll 1 and the inside of the soft sleeve 5 via the soft sleeve 5. Shoe 6 for regulating the width of nip N
A plurality of hydraulic cylinders 8 arranged in a line in the roll axis direction on the support beam 4 as a pressing device for adjusting the nip pressure by displacing the shoes 6 in the radial direction via the support plate 7; The lubricating oil supply device (not shown) for supplying lubricating oil to the surface of the shoe 6 is provided.

According to the shoe nip calender, a wide nip N can be formed between the shoe 6 and the soft sleeve 5 in combination with the hard roll 1 on the mating side. When passing through the nip N, for example, as compared with a nip between hard rolls or a nip between a hard roll and a soft roll, the maximum compression portion is reduced with respect to the average nip force, and the nip retention of the base paper 3 Since the time is long, there is an advantage that a high calendar effect can be provided without reducing the bulk (thickness).

[0005]

However, the conventional shoe roll 2 used in the above-mentioned shoe nip calender has a disadvantage.
In this case, the nip pressure suitable for the properties of the base paper 3 can be selected by displacing the shoe 6 in the radial direction (vertical direction) by the expansion and contraction operation of the hydraulic cylinder 8 as a pressurizing device. Since the width in the paper passing direction is constant, it was impossible to change the nip residence time of the base paper 3 and the nip pressure distribution (compression stress distribution), which are factors affecting the product.

[0008] Some conventional shoe nip calendars are arranged such that the hydraulic cylinders 8 are arranged in two rows in the front and rear directions in the paper-feeding direction. In this case, the pressing force by the front and rear hydraulic cylinders 8 is increased. The effective contact area can be slightly changed by changing the contact angle of the shoe 6 with the hard roll 1 by making a difference between the two, but the width of the shoe 6 in the paper passing direction cannot be changed.

Accordingly, the present invention provides a method for adjusting the width of a shoe in the paper passing direction in accordance with conditions such as the properties of the base paper to be subjected to gloss processing, thereby reducing the nip residence time of the base paper and the nip pressure distribution in the paper passing direction. It is intended to be arbitrarily changeable.

[0008]

According to the present invention, in order to solve the above-mentioned problems, a shoe arranged inside a soft sleeve is brought into contact with a mating hard roll via the soft sleeve by a pressurizing device. In a shoe nip calender provided with a shoe roll configured to form a nip, the shoe of the shoe roll is divided into two tapered portions by a dividing surface inclined at an intermediate portion in a width direction in a paper passing direction with respect to a roll axis direction. While dividing into shoe blocks of the shape, one shoe block as a fixed shoe block,
The other shoe block is configured as a movable shoe block that can be slid and displaced in a direction along the division surface by an actuator.

Since the shoe is divided into two tapered shoe blocks, when the movable shoe block is slid along the dividing surface, the width of the shoe in the paper passing direction can be changed. The nip residence time and the nip pressure distribution in the paper passing direction can be changed.

[0010] In addition, by providing the pressurizing device with each of the fixed shoe block and the movable shoe block, the contact angle between the fixed shoe block and the movable shoe block with respect to the hard roll can be changed. This is advantageous.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1A and 1B show an embodiment of the present invention. As shown in FIG.
The shoe roll 2 is arranged so that the nip N is formed by bringing the shoe 6 disposed inside the nip N into contact with the hard roll 1 on the other side via the soft sleeve 5 by the hydraulic cylinder 8 as a pressurizing device. In the shoe nip calender, the shoe 6 of the shoe roll 2 is divided into two tapered shoe blocks by a dividing surface which is appropriately inclined with respect to the roll axis direction at an intermediate portion in the width direction as the paper passing direction. Is a fixed shoe block 6a fixed to the surface of the support plate 7 fixed to the hydraulic cylinder 8 according to the paper width, and the other shoe block is formed longer than the paper width on the surface of the support plate 7. To form a movable shoe block 6b slidably disposed, and the fixed shoe block 6a and the movable shoe block 6b are separated from each other. The movable shoe block 6b can be displaced along the dividing surface with respect to the fixed shoe block 6a while maintaining the mutual engagement state as a sliding guide 6c of a dovetail joint structure. The movable shoe block 6b
And a hydraulic cylinder 9 as an actuator for slidingly displacing the cylinder.

The movable shoe block 6b of the shoe 6 is shown in FIG.
When the hydraulic cylinder 9 is extended in the normal position shown by the solid line (b), the movable shoe block 6
b is slid along the slide guide 6c of the tapered divided surface portion, and is displaced to, for example, a position indicated by a two-dot chain line, whereby the overall width of the shoe 6 in the paper passing direction is widened. On the other hand, when the hydraulic cylinder 9 is shortened, the movable shoe block 6b is slid in the opposite direction along the slide guide 6c, and is displaced to, for example, a position indicated by a dashed line, so that the paper passing of the shoe 6 is performed. The overall width in the direction is reduced.

As described above, if the width of the shoe 6 in the paper passing direction is increased in a state where the operation speed of the shoe nip calendar is constant, the nip residence time of the base paper 3 can be changed so as to be longer. When the width of the base paper 6 in the paper passing direction is reduced, the nip stay time of the base paper 3 can be changed to be shorter. In a state where the pressing force by the hydraulic cylinder 8 as the pressurizing device is kept constant, the shoe 6
When the width in the paper passing direction is increased or decreased, the cross-sectional shape (cross-sectional area) of the shoe 6 in the paper passing direction changes, and the pressure distribution in the paper passing direction of the nip N can be changed. . At this time, the cross-sectional shape in the paper width direction does not change. Therefore, the nip residence time and the nip pressure distribution can be optimally selected as described above according to the properties of the base paper 3 to be gloss-processed.

FIG. 2 shows another embodiment of the present invention. In a configuration similar to that shown in FIGS. 1A and 1B, a row of hydraulic cylinders as pressurizing devices is fixed. It is divided into a row of hydraulic cylinders 8a for the shoe block 6a and a row of hydraulic cylinders 8b for the movable shoe block 6b.

According to this embodiment, the hydraulic cylinder 8
a and 8b, the fixed shoe block 6 for the hard roll 1
The effective working area can be changed by changing the contact angle between a and the movable shoe block 6b. Therefore, by using the width adjustment of the shoe 6 together, it is possible to select a more optimal nip condition according to the properties of the base paper 3 on which gloss processing is performed.

In the above embodiment, the case where the hydraulic cylinder 9 is used as an actuator for displacing the movable shoe block 6b has been described. However, a motor drive system or the like may be used. In the embodiment, the case where the shoe block on the downstream side in the sheet passing direction is a movable shoe block has been described.However, the shoe block on the upstream side may be a movable shoe block, as long as it does not deviate from the gist of the present invention. Of course, various changes can be made.

[0018]

As described above, according to the shoe nip calendar of the present invention, the shoe disposed inside the soft sleeve is brought into contact with the mating hard roll via the soft sleeve by the pressurizing device. In the shoe nip calender provided with the shoe roll, the shoe of the shoe roll is formed into two tapered shapes by a dividing surface inclined at an intermediate portion in the width direction, which is the paper passing direction, with respect to the roll axis direction. Divided into shoe blocks and one shoe block as a fixed shoe block,
Since the other shoe block is configured as a movable shoe block that can be slid and displaced in a direction along the dividing surface by an actuator, the width of the shoe can be changed by displacing the movable shoe block. The nip residence time and nip pressure distribution of the base paper can be arbitrarily selected, which makes it possible to optimize the gloss processing of the base paper according to the properties of the base paper. By adopting a configuration in which each of the shoe block and the movable shoe block is equipped, the angle of contact between the fixed shoe block and the movable shoe block with respect to the hard roll can be changed, so that the effective working area can be changed. Therefore, by using it together with the above width adjustment, a more optimal nip condition can be selected according to the properties of the base paper. Can be, there is exhibited an excellent effect that.

[Brief description of the drawings]

FIG. 1 shows an outline of an embodiment of a shoe nip calendar of the present invention, wherein (a) is an enlarged view of a shoe portion,
(B) is an AA direction arrow view of (A).

FIG. 2 is a schematic view of a shoe portion showing another embodiment of the present invention.

FIG. 3 is a schematic view showing an example of a shoe nip calendar.

[Explanation of symbols]

 Reference Signs List 1 hard roll 2 shoe roll 3 base paper 5 soft sleeve 6 shoe 6a fixed shoe block 6b movable shoe block 8, 8a, 8b hydraulic cylinder (pressurizing device) 9 hydraulic cylinder (actuator)

Claims (2)

[Claims] 1. A shoe nip calender provided with a shoe roll configured to cause a shoe disposed inside a soft sleeve to abut on a mating hard roll via the soft sleeve by a pressing device to form a nip. In the above, the shoe of the shoe roll is divided into two tapered shoe blocks by a dividing surface that is inclined with respect to the roll axis direction at an intermediate portion in the width direction that is the paper passing direction, and one shoe block is fixed to the shoe. Along with the block,
A shoe nip calender, characterized in that the other shoe block is configured as a movable shoe block capable of being slidably displaced in a direction along the dividing surface by an actuator. 2. The shoe nip calendar according to claim 1, wherein the pressurizing device is provided on each of the fixed shoe block and the movable shoe block.