JP3949259B2 - Heating roller device - Google Patents

Description

[0001]
[Technology to which the invention belongs]
The present invention relates to a heating roller device that heats a workpiece such as a web between a pair of rollers, a heat roller and an elastic roller, and more particularly to cooling of an elastic roller.
[0002]
[Prior art]
For example, it is generally known as a calendar process to perform a hot rolling process by continuously passing a workpiece made of a sheet material such as paper or nonwoven fabric or a web material between the nips of a pair of heat rollers. As a heating roller device in this case, one pair of rollers is a metal heat roller, and the other roller is an elastic roller made of a surface resin in which resin is wound with an outer cover material.
[0003]
In such a heating roller device, when the object to be processed is sandwiched between the metal heat roller and the elastic roller, the object to be processed on the surface of the elastic roller is in contact with the pressure applied by the nip of both rollers. The part is deformed (dented). If the workpiece has a sufficient thickness even with such deformation, the metal heat roller and the elastic roller are only in contact with each other through the workpiece, and the two rollers are in direct contact with each other. There is no. However, when the object to be processed does not have a sufficient thickness, both the rollers are in direct contact with both ends of the roller that are not in contact with the object to be processed.
[0004]
The sufficient thickness here means that the object to be processed of the elastic roller is in contact with the surface of the elastic roller (depression) at the part where the object to be processed is in contact with the pressure applied by the nip of both rollers. This means that the thickness of the two ends is not in contact with the metal heat roller. Therefore, the smaller the thickness of the object to be processed, the higher the applied pressure, and the lower the hardness of the outer cover resin of the elastic roller, the more direct contact of both ends of both rollers occurs.
[0005]
When this direct contact occurs, as a matter of course, the heat of the metal heat roller is transferred to and transmitted to the surface of the elastic roller, and the surface temperature rises only at both ends of the elastic roller. Generally, a material having sufficient heat resistance, resilience, resistance to scattering at breakage, and other characteristics is selected as the resin for the elastic roller. However, the temperature rises above the limit temperature of the heat resistance temperature. Then, it may be denatured and damaged, or if the difference between the temperature of the portion of the elastic roller where the workpiece is in contact and the temperature of the non-contact portion exceeds a certain level, excessive internal stress may occur. It can lead to destruction.
[0006]
On the other hand, there is a demand for increasing the surface temperature of the metal heat roll in the calendering process to improve the calendering heat treatment effect and to improve various properties (for example, surface gloss, smoothness, printing suitability, etc.) of the object to be treated. In order to satisfy this requirement, there is a conventional method in which both ends of the elastic roller that are not in contact with the object to be processed are tapered to avoid the contact under the use conditions in which such direct contact occurs. Has been taken.
[0007]
However, in this method, there is a restriction that the width of the object to be processed must always be constant, and if the object to be processed meanders and its end protrudes from the taper start portion of the elastic roller, it is not calendered. There are drawbacks such as flowing into the process. As another method, an injection device that injects air onto the surface of the elastic roller at a position immediately after the nip is installed, and air is selectively injected onto a portion of the elastic roller surface that has reached a high temperature to cool it. is there. However, since the specific heat of air is relatively small, there is a problem that the cooling amount cannot be increased in place of the injection amount.
[0008]
In order to solve this problem, there is a heating roller device in which the cooling amount is increased by spraying a cooling medium of a mixture (mist) of air and water or other evaporating liquid on the surface of the elastic roller at the same position. 3 and 4 show the structure of such a heating roller device. In FIGS. 3 and 4, 1 is a metal heat roller heated by a heater or the like, and 2 is an elastic roller made of surface resin (2a). 3 is an object to be treated, and 4 is a sprayer for spraying a cooling medium. The workpiece 3 is continuously passed through the nip between the metal heat roller 1 and the elastic roller 2 and subjected to hot rolling.
[0009]
The sprayer 4 for spraying the cooling medium is disposed at a position facing the end surface 2b of the elastic roller 2 immediately after the nip between the metal heat roller 1 and the elastic roller 2, and is applied to both side end surfaces 2b of the elastic roller 2 after the nip. In addition, cooling by convection is performed by blowing a cooling medium mixed with air and water or other evaporating liquid (mist), and at the same time, when moisture adhering to the surface of the elastic roller 2 evaporates, Cool by taking away the latent heat of vaporization.
[0010]
[Problems to be solved by the invention]
However, in order to cool the both end surfaces by spraying a cooling medium composed of a mixture of air and water or other evaporating liquid on the both end surfaces of the elastic roller after the nip as described above, spray is performed. If the amount of water is too much, it will not evaporate completely by the time when it reaches the nip again after about 3/4 rotation, and the excess water will pass through the nip, and the moisture content of the workpiece will be localized. As a result, the characteristics of the processed object after the calendar process (for example, the gloss and smoothness of the surface of the processed object) are locally changed, and if the amount of water is small, a sufficient cooling effect can be obtained. Since the elastic roll is damaged, the amount of water sprayed on the surface of the elastic roller needs to be adjusted strictly so that a sufficient cooling effect can be obtained and the next nip does not remain and all of the water evaporates. There is.
[0011]
However, the amount of water evaporation, that is, the proper spray amount depends on many factors such as the surface temperature of the elastic roller, the number of revolutions, the ambient temperature, and the ambient humidity, and it is not possible to adjust it over time according to those factors. Since it is extremely difficult, there is a problem that local changes in various characteristics of the workpiece cannot be avoided, particularly under operating conditions where the ambient humidity is high and surplus moisture tends to remain.
[0012]
The present invention has been made in view of the above problems, and provides a heating roller device that can efficiently cool the surface of an elastic roller and that does not cause local changes in various characteristics of an object to be processed. Objective.
[0013]
[Means for Solving the Problems]
The present invention provides a heating roller device having a heat roller made of metal and an elastic roller made of surface resin, and heat-treating an object to be processed between the rollers, and the elastic roller immediately after the nip by the both rollers. A sprayer for spraying a mist-like cooling medium on the end surface, and a nozzle for blowing air to be blown out of the width of the workpiece sandwiching moisture on the surface of the elastic roll immediately before the nip by the two rollers. It is provided.
[0014]
A cooling medium mixed with air and evaporating liquid such as water is sprayed onto the surface of the high temperature portion of the elastic roller immediately after the nip, and the elastic roller is positioned just before the nip after about half a rotation of the elastic roller. Blow air onto the surface of the. By blowing air immediately before the nip of this elastic roller, excess water that could not be evaporated out of the water of the cooling medium blown immediately after the nip is accelerated by convection to cause latent heat cooling and at the same time By setting the angle, excess water is blown off the width of the workpiece by air convection.
[0015]
This makes it extremely easy to adjust the amount of water in the cooling medium sprayed immediately after the nip, and also allows sufficient water content to be taken together with the air blowing just before the nip to increase the cooling effect. Thus, it is possible to obtain a heating roller device that allows the use of a heat roller and that does not cause local changes in the characteristics of the workpiece.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view of a heating roller device according to an embodiment of the present invention, and FIG. 2 is a side view thereof. 1 and 2, 11 is a metal heat roller heated by a heater or an induction coil, 12 is an elastic roller made of surface resin (12a), 13 is an object to be processed such as a web, and 14 is sprayed with a cooling medium. A sprayer, 14a is a hose that supplies pressure air, 14b is a hose that supplies an evaporating liquid such as water, 15 is an air spray nozzle, and 15a is a hose that supplies pressure air.
[0017]
The metal heat roller 11 and the elastic roller 12 are rotatably supported by a bearing (not shown), and are nipped with a predetermined pressure by a hydraulic cylinder (not shown) or the like in a pair of rollers. The workpiece 13 is inserted into the nip portion between the metal heat roller 11 and the elastic roller 12, and is hot-rolled during the insertion.
[0018]
The sprayer 14 is arranged at a position facing the end surface 12b of the elastic roller 12 immediately after the nip between the metal heat roller 11 and the elastic roller 12, and the pressure air sent by the hose 14a and the evaporation sent by the hose 14b. The liquid is mixed and sprayed onto the end surface 2b of the elastic roller 12 immediately after the nip. By this spraying, the surface of the elastic roller 12 is cooled by convection of the cooling medium and latent heat of evaporation generated by evaporation of water in the cooling medium.
[0019]
The air blowing nozzle 15 is disposed at a position facing the end surface 12b of the elastic roller 12 just before the nip between the metal heat roller 11 and the elastic roller 12, with the blowing angle inclined outward with respect to the elastic roller 12, The pressure air sent by the hose 15a is blown obliquely to the end surface 2b of the elastic roller 12 immediately before the nip.
[0020]
The excess water that could not be evaporated out of the water in the cooling medium sprayed by the sprayer 14 by this spraying is accelerated by convection to perform latent heat cooling, and at the same time, the remaining water is removed from the elastic roller 12, that is, covered. Blow off the width of the processed product 13. As a result, the moisture on the surface of the elastic roller 12 in the nip portion is eliminated, and local changes in various characteristics of the object to be processed due to the moisture can be avoided.
[0021]
In the above-described embodiment, the sprayer 14 is installed at two positions on the opposite ends of the both ends of the elastic roller 12. It may be further arranged. Further, the air spray nozzle 15 is inclined at a spray angle with respect to the elastic roller 12, but it is sufficient that excess moisture is removed from the width of the workpiece 13, and this tilt is arbitrary.
[0022]
【The invention's effect】
As described above in detail, according to the present invention, any thickness of workpieces, nip pressure, elastic roller hardness, and both ends of the elastic roller are processed into a taper shape without further processing. Even if the surface temperature of the heat roller is increased, the metal heat roller and the elastic roller come into contact with each other to efficiently cool the surface of the elastic roller at a high temperature, and at the same time, local portions of the object to be processed due to excess moisture. It is possible to provide a heating roller device that does not cause changes in various characteristics.
[Brief description of the drawings]
FIG. 1 is a front view of a heating roller device according to an embodiment of the present invention.
2 is a side view of the heating roller device of FIG. 1. FIG.
FIG. 3 is a front view of a conventional heating roller device.
4 is a side view of the heating roller device of FIG. 3. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Metal heat roller 12 Elastic roller 13 To-be-processed object 14 Sprayer 15 Air spray nozzle

Claims (1)

In a heating roller device having a heat roller made of metal and an elastic roller made of surface resin, and heat-treating an object to be processed between the both rollers, on the end surface of the elastic roller immediately after the nip by the both rollers the sprayer spraying a mist of cooling medium, also the end surfaces of the elastic rolls of the nip just before by the both rollers, in that a nozzle for blowing air to fly in width outside of the object to sandwich the water surface A heating roller device.

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