JP4357497B2 - Heat transfer roller - Google Patents

Description

  The present invention relates to a roller that heats or heat-treats a processed object such as a resin film using a fluid as a heat medium.

  A treatment object such as a resin film is placed on a roller, and the treatment object is heated to a predetermined temperature while passing through the roller, or the high temperature treatment object is deprived to a predetermined temperature. . When heat treatment is performed, the roller is heated to a temperature required for the heat treatment. When heat treatment is performed, the temperature of the roller itself increases due to heat removal from the processed material. Cooling. In either case, a medium for transferring heat is required, and a fluid such as oil is used as the medium. That is, a fluid having an appropriate temperature is allowed to pass through the inside of the roller, and the roller is heated or deprived from the roller by this fluid (hereinafter, such a roller is referred to as a heat medium flow roller).

  FIG. 6 shows a schematic configuration of an example of such a heat medium flow roller. In FIG. 6, 1 is a roll shell, 2 is a rotary drive shaft, 3 is a core, 4 is a rotary joint, and 5 is an oil storage tank. , 6 is oil (heat medium fluid), 7 is a heat exchanger for heating or cooling, 8 is a temperature sensor, 9 is a pump, and 10 is a processed object such as a resin film. The roll shell 1 has a cylindrical shape, and a core 3 is disposed inside the hollow shell, and a heat medium passage 3 a is formed through the center of the core 3. The heat medium flow path 3 a is connected to the inlet of the rotary joint 4 through the rotary drive shaft 2, and is formed between the inner peripheral wall of the roll shell 1 and the outer peripheral wall of the core 3. Is connected to the outlet of the rotary joint 4 through the rotary drive shaft 2.

  That is, the oil 6 in the oil storage tank 5 passes through the heat exchanger 7 for heating or cooling, is brought to a predetermined temperature, is sent into the roll shell 1 by the pump 9, and flows through the heat medium passages 3a and 1a. 6 is discharged to the oil storage tank 5. The roll shell 1 is maintained at a predetermined temperature while mainly flowing through the heat medium passage 1a, and heats or removes the processed material 10 that is in contact with the surface of the roll shell 1.

  By the way, in such a heat-medium flow roller, the temperature of the heat-medium fluid that flows into the roller (the roll shell connected to the rotary drive shaft) and the temperature of the heat-medium fluid that flows out after heating or removing the processed material Since a temperature difference occurs between the temperature and the temperature difference appears on the surface of the roller, there is a problem in that a uniform heat treatment cannot be performed in the longitudinal direction along the axis of the roller of the processed material in contact with the roller surface. There is. In order to eliminate this problem, conventionally, in order to reduce this temperature difference, the flow rate of the heat transfer fluid flowing through the roller is increased in accordance with the temperature difference. Therefore, there has been a problem that the heat exchanger or pump for heating or cooling has to be enlarged.

  The present invention has been made to solve such a problem, and provides a heat-medium flow roller that enables uniform heat treatment of a processed material and can reduce the size of a heat exchanger and a pump. Objective.

The present invention is a heat medium flow roller that has a heat medium flow channel and heats or heat-treats a processed material that comes into contact with the surface by a heat medium fluid flowing through the heat medium flow channel. A plurality of sealed chambers that enclose a gas-liquid two-phase heat medium extending in the longitudinal direction of the roller are provided along the outer circumferential surface of the roller, and heat that serves as a heat medium passage between the adjacent sealed chambers. A medium flow through hole is provided, and an electromagnetic heating mechanism is provided in the hollow of the roller .

  In the present invention, there is provided a sealed chamber for enclosing a gas-liquid two-phase heat medium extending in the longitudinal direction of the roller in the wall thickness of the roller, and a heat medium passage is provided in the wall thickness of the roller along with the sealed chamber. Therefore, even if a temperature difference occurs between the temperature of the heat transfer fluid flowing into the roller and the temperature of the heat transfer fluid flowing out after heating or removing the processed material, the gas-liquid two-phase heat transfer medium Due to the movement of the latent heat, the surface temperature in the longitudinal direction along the axial center of the roller is made uniform, and the heat transfer of the heat transfer fluid is also fast, which can greatly reduce the flow rate of the heat transfer fluid. The adoption of a pump makes it possible to reduce equipment costs, and energy saving can be achieved by reducing the heat radiation of the piping and the pump capacity.

The purpose of providing a heat-medium flow roller that enables uniform heat treatment of the processed material and that can reduce the size of the heat exchanger and pump is to provide a gas-liquid two-phase heat medium within the wall thickness of the hollow roller. a sealed chamber enclosing, the sealed chamber and alongside the roller thick inside provided heat medium flow path Rutotomoni was realized from Kotono providing electromagnetic heating system inside the hollow roller.

First, it will be described with reference to FIG. About the basic configuration of the present invention. FIG. 1 is a longitudinal sectional view of a heat medium flow roller according to a basic configuration , FIG. 2 is a partial sectional view of the same, FIG. 3 is an operation explanatory view, (a) is a heating time, (b) is a deprivation. Indicates hot time. Note that the circulation path of oil (heating medium fluid) including the rotary joint 4, the oil storage tank 5, the heat exchanger 7 for heating or cooling, the temperature sensor 8, and the pump 9 shown in FIG. 6 is omitted in the drawing.

  In FIGS. 1 to 3, 10 is a processed material such as a resin film (see FIG. 3), 11 is a roll shell, 12 is a rotary drive shaft, 13 is a sealed chamber, 14 is a heat medium flow pipe, and 15 is a gas-liquid 2. It is a heat medium that forms a phase.

  The roll shell 11 has a cylindrical shape, and both end portions in the longitudinal direction are connected and fixed to the flange 12 a of the rotary drive shaft 12. The sealed chamber 13 is formed with a hole in the wall thickness of the roll shell 11, for example, from the longitudinal edge of the roll shell 11 by a drill in the longitudinal direction, and an appropriate amount of water serving as a gas-liquid two-phase heat medium in the hole. 15 is injected to close the opening, and a plurality are provided along the outer peripheral surface of the roller at an appropriate interval as shown in FIG.

  The heat medium flow pipe 14 penetrates the inside of the sealed chamber 13 along the longitudinal direction, and extends to both edges of the roll shell 11 in the longitudinal direction. A heat medium flow hole is formed in the rotary drive shaft 12 and its flange 12a, and the heat medium flow pipe 14 communicates with the heat medium flow hole. That is, a heating medium fluid such as oil for heating or depriving the roll shell 11 fed through a heating or cooling heat exchanger, a pump and a rotary joint (not shown) It passes through the heat medium flow pipe 14 through the heat medium flow hole of the flange 12a, and is discharged to the oil storage tank through the heat transfer hole and the rotary joint of the other flange 12a and the rotary drive shaft 12.

  When heating the processed object 10 such as a resin film, a heat medium fluid heated to a predetermined temperature is used. When the heat medium fluid passes through the heat medium flow pipe 14, it is sealed as shown in FIG. The heat medium 15 in the chamber 13 is heated and vaporized, and the heat heats the processing object 10 through the roll shell 11. The gas that has been deprived of heat is liquefied and heated again by the heat transfer fluid to be vaporized by heating, and the heat heats the processed material 10 via the roll shell 11. This operation is repeated. When heating the processed object 10, the heat vaporized heat moves to the lower temperature side where the processed object 10 abuts, and the temperature difference is such that the temperature on the inflow side of the heat transfer fluid is high and the temperature on the outflow side is low. Even if this occurs, the processed object 10 can be uniformly heat-treated in the longitudinal direction along the axis of the roller.

  In addition, when the high-temperature processed object 10 such as a resin film is deprived of heat at a predetermined temperature, a heat transfer fluid heated to a predetermined temperature is used in order to prevent a decrease in temperature. When passing through the tube 14, the heat of the roll shell 11 heated by the processed material 10 is transmitted to the gas-liquid two-phase heat medium in the sealed chamber 13 as shown in FIG. 3B, and the heat medium flow tube 14. It is cooled to a predetermined temperature by the heat transfer fluid passing through. In this case, even if a temperature difference occurs such that the temperature on the inflow side of the heat transfer fluid is low and the temperature on the outflow side is high, the heat of the gas moves to the lower side, and the processed material 10 moves in the longitudinal direction along the axis of the roller. For uniform heat treatment.

In this basic configuration , since the flow path of the heat transfer fluid does not directly contact the roll shell 11, it is possible to suppress deterioration in mechanical accuracy due to the thermal expansion difference of the roll shell 11, and a necessary heating unit And can effectively act on the heat sink.

In the above basic configuration, the heat medium flow pipe 14 is made to penetrate the inside of the sealed chamber 13 along the longitudinal direction to form a flow path of the heat medium fluid. In the embodiment according to the present invention, the heat medium As shown in FIG. 4, the fluid flow path passes through the inside of the wall thickness of the roll shell 11 in parallel with the sealed chamber 13 between the sealed chamber 13 that stores the gas-liquid two-phase heat medium. to form a Nagareana 16. In thus constituted heat medium passing roller, the heat of the roll shell 11, Ru der those directly heated or ablative heat by heat transfer fluid passing through the Netsunakadachidori Nagareana 16. Similarly to the heating medium passing roller shown in FIGS. 1 and 2 by the latent heat movement of the gas-liquid two-phase heating medium in tight closed from 13, uniform with respect to the longitudinal direction along the treated product to the axis of the roller Heating and heat treatment can be performed.

About the heat medium flow roller configured as described above, the roll diameter is 310 mm, the roll surface length is 1110 mm, the fan load operation, the fluid flow rate is 2.4 m ³ / h, the fluid specific gravity is 841 kg / m ³ , and the fluid specific heat is 0.42 kcal / kg. The temperature was measured by arranging 14 temperature sensors on the surface of the roll shell 11 at almost equal intervals from the fluid outlet side to the inlet at a fluid inlet temperature of 178 ° C., a fluid outlet temperature of 168 ° C., and a fluid inlet / outlet temperature difference of 10 ° C. .

As a result, 146.8 148.8 [150.6 150.8 150.9 150.9 150.9 150.8 150.6 150.7 150.5 150.3] 149. 4 147.8. The temperature in [] is the effective length of the sealed chamber containing the gas-liquid two-phase heat medium and the effective length of the treatment width 960 mm. The temperature difference in this range is 0.6 ° C., and a good temperature distribution is exhibited regardless of the fluid inlet / outlet temperature difference of 10 ° C. In addition, the temperature outside [] is a portion outside the effective roll length outside the effective chamber, and the temperature is slightly lowered due to heat being taken away by the rotary drive shaft.

The amount of heat released by the roll is calculated as Q (kcal / h) = 10 × 2.4 × 841 × 0.42 = 8477 kcal / h = 9.86 Kw. Here, when the flow rate V when obtaining this temperature difference of 0.6 ° C. is obtained without providing a sealed chamber containing the gas-liquid two-phase heat medium, V (m ³ / h) = 8477 / (0. 6 × 841 × 0.42) = 40 (m ³ / h). This means that a fluid flow rate of about 16.7 times as much as that required when a sealed chamber containing a gas-liquid two-phase heat medium is provided.

  Therefore, when a sealed chamber containing a gas-liquid two-phase heat medium is provided, the fluid flow rate is 1 / 16.7 times higher, and in this case, the cross-sectional area of the piping and the rotary joint is 1 / 16.7. It is possible to reduce the cost required for the piping and the rotary joint. In addition, the reduction of the fluid flow rate leads to a reduction in piping man-hours and installation space, and there is a great merit as a cost reduction. Furthermore, the fact that the cross-sectional area of the flow path becomes 1 / 16.7 means that the piping surface area is about 1/4. The heat radiation of the pipe can be reduced to ¼ to save energy. If the flow rate of the fluid is small, the pump supplying the fluid may be small. If the flow rate is 1 / 16.7, the capacity of the pump is usually about 1/10.

The above is the case where the fluid inlet / outlet temperature difference is 10 ° C. The reason why the fluid inlet / outlet temperature difference is 10 ° C. is that the temperature distribution accuracy in the effective length of the roll is usually less than 5 ° C. Need to be. That is, the fluid inlet / outlet temperature difference needs to be less than 5 ° C., and when the fluid inlet / outlet temperature difference is 5 ° C. or more, the heat treatment cannot be uniformly performed unless the flow rate is increased according to the fluid inlet / outlet temperature difference.
However, by providing a sealed chamber containing a gas-liquid two-phase heat medium, it is possible to perform sufficiently uniform heat treatment without increasing the flow rate even if the fluid inlet / outlet temperature difference is 5 ° C. or more. That is, the temperature distribution accuracy in the effective length of the roll at a fluid inlet / outlet temperature difference of 10 ° C is 0.6 ° C. If the temperature distribution accuracy in the effective length of the roll is less than 5 ° C, the fluid inlet / outlet temperature difference is A significant temperature difference of 5 / 0.6 × 10 = 83.3 ° C. can be obtained, and a remarkable effect can be obtained in which piping, rotary joints, pumps, and the like can be reduced in size.

By the way, when the surface temperature of the roller (strictly speaking, roll shell) fluctuates due to heat removal, the surface temperature of the roller is controlled to be constant by controlling the temperature of the heat transfer fluid. Since the heat transfer coefficient with the flow path wall surface is small compared to the case where the roller temperature is relatively stable, the roller temperature does not follow and a time delay occurs. In order to eliminate this delay, an induction heating mechanism for adding Joule heat to the roller itself is added .

  FIG. 5 shows a heat medium flow roller in which an induction heat generating mechanism 18 composed of an induction coil and an iron core is arranged in the hollow portion of the heat medium flow roller. When the temperature is changed, it is possible to respond quickly. In FIG. 5, the heat medium flow roller shown in FIG. 1 is provided. However, the heat medium flow roller shown in FIG.

  In the above embodiment, an appropriate amount of water 15 or the like serving as a gas-liquid two-phase heat medium is injected into the sealed chamber, but a heat pipe may be inserted into the sealed chamber. Further, the plurality of sealed chambers are independent from each other, but may be communicated with each other at, for example, end portions on both sides of the sealed chamber. The communication path may be provided in the flange of the rotary drive shaft.

It is a longitudinal cross-sectional view which shows the heat-medium flowing roller which concerns on the basic composition of this invention. It is a cross-sectional view of a part of the heat medium flow roller shown in FIG. It is operation | movement explanatory drawing of the heat-medium flow roller shown in FIG. It is a cross-sectional view of a part of the heat medium flow roller according to the embodiment of the present invention. It is a longitudinal cross-sectional view of the heat-medium flow roller which concerns on the Example of this invention. It is a longitudinal cross-sectional view which shows the conventional heat-medium flow roller.

Explanation of symbols

DESCRIPTION OF SYMBOLS 4 Rotary joint 5 Oil storage tank 7 Heat exchanger for heating or cooling 8 Temperature sensor 9 Pump 10 Processed object 11 Roll shell 12 Rotation drive shaft 13 Sealed chamber 14 Heat medium flow pipe 15 Heat medium which forms two phases of gas and liquid 16 Heat Medium flow hole
18 Induction heating mechanism

Claims (1)

A heat medium flow roller that has a heat medium flow channel and heats or heat-treats the processed material that comes into contact with the surface by the heat medium fluid flowing through the heat medium flow channel, and inside the wall thickness of the roller, A plurality of sealed chambers for enclosing a gas-liquid two-phase heat medium extending in the longitudinal direction of the roller are provided along the outer peripheral surface of the roller, and a heat medium flow through that serves as a heat medium flow path between the adjacent sealed chambers is provided. A heat medium flow roller characterized in that a hole is provided and an electromagnetic heating mechanism is provided in the hollow of the roller.

Images