JP3443546B2 - Heatable calender roll - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device provided with a hollow cylindrical roll body having an excluding body, and flange journals carrying flanges fixed to both sides of the roll body. The present invention relates to a calender roll that can be heated by a medium, and particularly to a calender roll for smoothing or polishing.

[0002]

2. Description of the Related Art Calender rolls of this type are widely used in calendering devices, for example, for smoothing or polishing paper. Effective and uniform heating of the surface of the roll body is achieved by the large number of peripheral holes through which the heating medium flows. By the way, it is necessary to heat the inner surface of the roll main body as well to narrow the gap generated in front of the inner surface due to the press-fitting of the excluding body, thereby achieving a flow velocity that ensures good heat conduction. However, for the reason of weight reduction, the center hole is often formed in the center of the roll body even when the holes in the peripheral portion are used. The loss of the central neutral layer reduces the weight, but the load capacity is slightly reduced. By forming a central hole in the center of the roll body, the hollow space of the roll body can be filled with the heating medium, or the hollow space can be blocked from the heating medium.

Usually, built-in elements of this kind, in particular exclusion bodies, are
Manufactured from steel sheet within small tolerances, pressed into the roll body and joined to the roll body. Therefore, when the calender rolls are started abruptly, especially when they are braked abruptly, the coupling elements of the exclusion body are subjected to great forces, causing destruction and damage of the exclusion body due to overload. It should be noted that if the specific gravity of the thin metal plate is large, it is necessary to balance this kind of built-in element, and it is also a problem that heat conduction in such an excluding body, particularly in the end region and the fixing region, causes thermal deformation of the roll body. Is.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heatable calender roll with a built-in element which is built into the central hole of the central part of the roll body without the drawbacks of conventional exclusion bodies. Is.

[0005]

In order to solve the above-mentioned problems, the present invention has an excluding member press-fitted into a central hole of a roll main body.
It is characterized in that the exclusion body is entirely made of plastic.

Since the entire excluding body is made of only plastic, the excluding body is flexible, and thus the excluding body is simple without requiring dimensional matching accuracy as in the case of the excluding body made of a thin metal plate. Can be pressed into . The low specific gravity of the plastic also avoids the problem of balancing, and the low heat transfer capacity of the plastic also eliminates the defective heat transfer in the suspension area at the ends. Moreover, because of the ease of processing, no special configuration is required wherever steam and condensate separation and discharge are required. For example, the surface temperature is 7
In the case of supercalenders such as Janus, Prosoft, Optiload at 0 ℃ to almost 135 ℃ or calenders based on a new concept, the exclusion body can be manufactured from ordinary plastic, and the rolls for soft calenders whose surface temperature is 200 ℃ or less. Only the selection of special plastic with heat resistance is necessary.

Purposeful, advantageous and inventive constructions of the subject matter of the invention are apparent from the dependent claims.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, some embodiments of the present invention will be described with reference to the accompanying drawings. A heatable calender roll is shown in FIG. 1, whose hollow cylindrical roll body 1 is carried by a flange journal 2 provided with flanges on both sides. The roll body 1 has a large number of holes 3 provided in its peripheral portion for allowing a heating medium for heating to flow therethrough.
And, for example, provided in the center to reduce the total weight,
And a central hole 4 having a larger diameter. The heating medium is supplied and returned by a two-part connection head 5 provided at one end of the flange journal 2. In addition, you may equip each end part of the flange journal 2 with an integral connection head.

The central hole 4 of the roll body 1 is provided with an exclusion body 6 wholly made of solid plastic. This excluding member 6 made of plastic can be firmly joined to the roll body 1 by a simple operation of press fitting. In this case, the exclusion body 6 is provided over the entire length of the central hole 4
Rather than performing with a uniform outer diameter larger than the inner diameter of
It is advantageous to maintain this outer diameter, assuming an interference fit , only over a certain plurality of longitudinal sections 7 and to slightly reduce the outer diameter of the exclusion body 6 between these longitudinal sections. Is. In this way the exclusion body 6 is an interference fit
It has been inserted into the center hole 4. On the other hand, the excluding body 6 may be divided into a plurality of portions that are individually and sequentially press-fitted. And
Perforations and grooves described below for each of these multiple parts.
Is provided.

A covering portion 8 made of a synthetic material (for example, plastic) is provided on the side surface of the illustrated roll body. The reflux of the heating medium to the connecting member 5 is performed by the excluding body 6
This can be done by an axially extending perforation 9.
If desired, the perforations 9 may be provided with (sometimes partially) tubes as bushings. On the other hand, the reflux of the heating medium may take place in the region of one or more grooves 10. The groove 10 may extend in the axial direction of the excluding member 6 along the side surface of the excluding member 6 in a meandering shape or a screw wire shape. If the groove is appropriately configured, it can be used to heat the inner surface of the roll body. The reduction of the cross section of the groove in the direction of flow through the heating medium makes it possible to compensate for the effect of cooling which increases in the direction of flow. Depending on the case, the flow-through pattern may be generated in association with the peripheral hole or only to the peripheral hole.
For example, a flow-through pattern may be created in which two parallel branch pipes are in series with another branch pipe.

A further weight saving of the calender roll can be achieved if, instead of the press-fitting block as a displacement body made of solid plastic, a block made of foamed plastic, which preferably has closed holes, is provided. It

Since plastics are easy to process, special incorporation elements can be incorporated economically. Especially in the case of steam-heated rolls, the axial steam supply hole for the back side of the roll body or the steam supply hole parallel to the axis should be the same as the condensate discharge hole in the axial direction or the condensate discharge hole in parallel with the axis. It may be placed in a plastics exclusion body. For collecting the condensate, the exclusion body 6 may be provided with suitable grooves, preferably deep grooves or radially extending grooves, at its ends.
It is also advantageous to provide a turning groove at the end of the central hole 4 of the roll body. The supply of the heating medium to the holes 3 at the periphery can also be achieved in a group pattern by additionally configuring the exclusion body 6 or by additionally configuring at least its ends. Not only is plastic a small specific gravity, it is also advantageous in that it is easy to process,
Balancing process is facilitated or not required.
The exclusion body may be divided into multiple parts and joined together by interference fit, screwing, mortise bonding, gluing, welding or the like.

The calender roll shown in FIG. 3 is implemented without forming a hole in the peripheral portion of the hollow cylindrical roll body 11. The roll body comprises an expulsion body 12 formed as a hollow body and consisting of a plastic tube 13. The plastic tube 13 is closed on both sides by plastic flanges 14. The inner surface of the roll body 11 and / or the side surface of the expulsion body 12 are provided with a groove 15, and the heating medium guided through the groove 15 directly contacts the inner surface of the roll body 11 to apply heat thereto. discharge. Basically, as shown in the development view of FIG. 4, displacement body 1
A group of two grooves extending in the axial direction may be arranged. However, in general, as a multi-thread screw-shaped groove that is intertwined with each other like a multi-thread screw, it is inclined with respect to the axial direction of the exclusion body.
An extending groove is provided. In this case, the heating medium that cools during the flow-through for heat dissipation is accelerated by the groove that is tapered in the flow-through direction, so that the temperature drop of the heating medium is increased by the increase of the flow velocity, and thus the heat transfer coefficient The increase can compensate. In the case of this embodiment, both flange journals are provided with an integral connecting head.

The calender roll 16 in the variant embodiment of FIG. 5 comprises a solid plastics exclusion body 17. The plastic expulsion body 17 is expediently made of foamed plastic with closed pores. Also in this case, the groove 15 forming the pipe line extends in a screw line shape for the purpose,
After flowing through the groove 15, the heating medium collects in the space 18 and is discharged through the hole 9 in the center of the exclusion body 17. Exclusion body 1
At the end of 7, a connecting pipe 19 is provided as a bush. The connecting pipe 19 may extend over the entire length of the hole 9.

As shown schematically in FIG. 6, the exclusion body 17 is embodied to provide grooves 20 and 21 arranged like a double thread, these grooves ending at the left end of the exclusion body 17 with a short-circuit ring. Alternatively, or if configured to be coupled together in any manner, separate return holes need not be provided. In this way, for example, the groove 20 forms a first conduit in which the heating medium is screw-shaped in the exclusion body 17.
To the opposite end of the roll body to be heated, from which the heating medium is returned to the conduit formed by the groove 21. Since the supply line is guided adjacent to the discharge line, this arrangement already provides some balancing of the effect of the supply temperature on the discharge temperature. In order to further promote this balancing effect, the cross-section of the groove is reduced in the flow direction, as shown enlarged in FIGS. 7a and 7b, so that the different flow velocities which result from this cause the required change in the heat transfer coefficient. Let it happen.

FIG. 8 shows another modified embodiment of the calender roll, which corresponds to the pipe guiding structure of FIG. However, the expulsion body 12 is embodied as hollow as in the case of the embodiment of FIG. 3 for further weight reduction. In this embodiment, the heating medium is returned to the space 18
If it is desired to do so via the connection pipe 19 instead of the connection pipe 19 of FIG. 5, it is necessary to provide a pipe 22 which penetrates the entire exclusion body 12 and the flange journal 2.

Another embodiment of the groove for forming the flow-through pipe will be described with reference to FIGS. 9 to 11. For example, in FIG. 9, the grooves 15 of the plastic tube 13 of FIG. 3 arranged parallel to one another are used to guide the heating medium.
According to FIG. 9, the exclusion body 17 of FIG. 5 is used, which comprises two grooves 23, 24 acting in parallel for guiding the heating medium, while the other return is effected only by the groove 25. Be done. In this case, it is expedient to consider each of these grooves as a repeating group along the circumference of the exclusion body 17. In this embodiment, it is easy to achieve the guiding of the heating medium by means of the two parallel lines 23 and 24 with a slower flow rate than in the case of a common return in line 25. A further modification of this modified embodiment is shown in FIG. Figure 10
In a variant of embodiment, the grooves are implemented with different cross sections. Manufacture can be achieved with deeper milling and multiple milling cutters with different widths.

In the embodiment of FIG. 10, the exclusion body groove 35, which causes the heating medium to be returned, is wider than the supply grooves 33 and 34. For example, a system as shown in FIG. 11 is also possible, and in this case, it is used by switching in tandem.
The two grooves 26 and 27 provide a pipe line that turns in two turns,
Different flow rates can be achieved with different groove widths and / or depths.

Finally, one more thing to note about the heatable calender rolls corresponding to FIGS. 1 and 2 (FIG. 12), the roll body 1 is provided with holes 3 in the periphery.
In this embodiment, additional heating is considered. That is, the heating medium rises in the hole 28 toward the peripheral hole 3, reaches the space 30 through the discharge hole 29, and passes through the groove 31 of the plastic exclusion body 6. The groove 31 is as shown in the drawing exclusion
Even if it extends in the axial direction of the body 6, the direction of the axis of the exclusion body 6
It may extend at an angle with respect to the direction.
A conduit defined by the inner surface of the base body 1 is formed. In this way, heating can be carried out again according to, for example, FIGS. 4, 6 or 9 to 11.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a calender roll having holes in its peripheral portion.

2 is a cross-sectional view of the calendar roll of FIG.

FIG. 3 is a longitudinal sectional view of a calender roll in which a plastics exclusion body is formed from a plastic tube closed on both sides by flanges, the sides of the exclusion body being provided with grooves through which the heating medium flows.

FIG. 4 is a variant embodiment of the side of the exclusion body with a groove through which the heating medium flows, with the grooves selected parallel to the axis for the sake of simplicity.

FIG. 5 shows a calender roll with an expulsion body for a two-way connection head made in one piece from plastic.

FIG. 6 shows an expulsion body with a heating medium guiding groove provided in the form of a double thread, the two grooves migrating to each other at the left end of the expulsion body, FIG. 7 shows the exclusion body with the right end connected to the two-way connection head.

7A and 7B are vertical sectional views of FIG. 6, respectively.

FIG. 8 is a view of a calender roll similar in function to the calender roll of FIG. 5, showing the calender roll with side and cover play exclusion bodies and a tube passing through the exclusion body. .

9 is a view showing a guide pattern of a heat medium flow path formed by grooves, which is different from FIG.

10 is a view of the flow path of the heat medium formed by the groove, FIG.
It is a figure which shows another induction pattern.

11 is a view of the flow path of the heat medium formed by the groove, FIG.
It is a figure which shows another induction pattern.

FIG. 12 is a view showing a calender roll having holes in its peripheral portion, wherein the heating medium is circulated in a conduit formed by a gap or a groove formed between a roll side surface and an excluding body. FIG.

[Explanation of symbols]

1 roll body 3 Holes around the roll body Of 4 rollscenterhole 6,12,17 exclusion body 9Perforation 10, 15, 20, 21, 23, 24, 25, 26, 2
7,33,34,35 groove

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-206198 (JP, A) JP-A-3-37410 (JP, A) JP-A-2-99686 (JP, A) JP-A-2- 47387 (JP, A) JP 54-138945 (JP, A) JP 56-153114 (JP, A) JP 56-153113 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D21G 1/00-9/00 D21F 1/00-13/12 F16C 13/00-15/00 D06B 1/00-23/30 D06C 3/00-29/00

Claims (11)

(57) [Claims] 1. A calender capable of being heated by a heating medium, which comprises a hollow cylindrical roll body having an excluding body, and flange journals carrying flanges fixed to both sides of the roll body to carry the roll body. In the roll, the excluding body (6, 12, 17) is press-fitted into the central hole (4) of the roll body (1), and the excluding body (6, 12, 17) is entirely made of plastic. A calendar roll to do. 2. Calender roll according to claim 1, characterized in that the exclusion body (6, 12, 17) is made of foamed plastic. 3. Calender roll according to claim 1 or 2, characterized in that the exclusion body (6, 17) has at least one perforation (9) in its central part. 4. Exclusion body (6, 12, 17) having at least one groove (10, 15, 2) extending along its circumference.
0, 21, 23, 24, 25, 26, 27, 33, 3
4.35) The calender roll according to any one of claims 1 to 3, characterized in that it is equipped with a calender roll. 5. Grooves (20, 21, 31) extending in a screw line shape.
The calender roll according to claim 4, wherein the calender roll is provided. 6. Exclusion body ( 6, 12, 17) along the side surface
A groove extending in the axial direction of the exclusion body or the axial direction of the exclusion body
Calender roll according to claim 4, characterized in that it is provided with grooves ( 10 , 15, 31) extending obliquely with respect to . 7. Exclusion body (6) is a central hole by interference fit
The calender roll according to any one of claims 1 to 6, which is inserted in (4) . 8. The outer diameter of the exclusion body (6) fits into the central hole (4) of the roll body (1) only over a plurality of longitudinal portions (7) and these longitudinal portions The calender roll according to claim 7, wherein the calender roll is reduced in space. 9. The exclusion body (6) has a plurality of parts in the longitudinal direction.
Divided into minutes , 9.
Calender roll described in any one of. 10. An exclusion body (12) or said plurality of exclusion bodies .
The calender roll according to any one of claims 1 to 9, wherein the portion is formed as a hollow plastic body. 11. Exclusion body (6) is a plurality of in the longitudinal direction.
Divided into parts, each of which has said perforations (9) and
Groove (10,15,20,21,23,24,25,2
At least one of 6, 27, 31, 33, 34, 35)
Is provided.
Calender roll described in any one of.