JP4526319B2 - Sheet heating device - Google Patents

Description

The present invention is a plastic film, plastic sheet, paper relates to equipment for heating a sheet material such as laminated material.

  In the manufacturing process, the processing process, etc. of the sheet-like material, it is widely performed to heat the traveling sheet-like material. One of the heating methods is a non-contact heating method using radiant energy such as an infrared heater. There is. As an example of the case where the sheet-like material is heated in a non-contact manner, as shown in FIG. 4, the sheet-like material 1 travels from the top to the bottom with rolls 2 and 3 such as a guide roll and a drive roll arranged vertically. A non-contact heating device using radiant energy such as an infrared heater or a far-infrared heater facing the region of the sheet-like material 1 that is traveling between the upper and lower rolls 2 and 3 ( (Referred to as a radiant heater) is provided, and the radiant heater 5 is configured to heat the sheet-like object 1 traveling forward in front of the radiant heater 5 in a non-contact manner. Non-contact heating using radiant energy such as an infrared heater has an advantage that a sheet-like material can be heated quickly or the amount of heating heat can be easily controlled.

  However, in the non-contact heating in the method shown in FIG. 4, when the heating output of the radiant heater 5 is increased to increase the productivity and the traveling speed of the sheet-like object 1 is increased, the sheet-like object 1 is fluttered ( It became clear that the phenomenon was fluttering. This flutter phenomenon becomes larger as the heating output is increased and the traveling speed of the sheet-like material is increased, and the swing width of the sheet-like material 1 is increased, so that the risk of causing a fire on contact with the radiant heater 5 increases. For this reason, conventionally, the heating output cannot be increased so much and the sheet-like material has to be heat-treated at a low speed (for example, about 30 to 40 m / min).

The present invention has been made in view of such a conventional problem, and suppresses a flutter phenomenon that may occur when a sheet-like material is heated in a non-contact manner, and performs non-contact heating while running the sheet-like material at a high speed. and to provide a pressurized NetsuSo location to enable.

  As a result of investigations to prevent the flutter phenomenon that occurs during non-contact heating of a sheet-like material, the present inventors have found the following matters. That is, as shown in FIG. 4, when the sheet-like object 1 is heated by the radiant heater 5 in a non-contact manner, the space 6 between the sheet-like object 1 and the radiant heater 5 rises as indicated by an arrow A. An air flow (forced convection due to heating) is generated, and when the heating output is increased, this upward air flow becomes extremely large. As a result of the ascending air current becoming high speed, the static pressure in the region where the ascending air current is generated is reduced to a negative pressure. On the other hand, on the back side of the sheet-like material 1 (the side opposite to the side facing the radiant heater 5), there is not much ascending airflow, so atmospheric pressure acts on the sheet-like material in the direction indicated by arrow B. Yes. For this reason, a pressure difference is generated between the front surface and the back surface of the sheet-like material 1, and the sheet-like material 1 is drawn toward the radiant heater 5 side by the pressure difference as indicated by a two-dot chain line 1a. Therefore, fluttering occurs and flutter phenomenon occurs. Therefore, if the rising air current generated in the space 6 between the sheet-like object 1 and the radiant heater 5 is reduced, the flutter phenomenon can be suppressed. And in order to suppress an updraft, it discovered that it was effective to suppress the entrance / exit of the air to the space 6 between the sheet-like object 1 and the radiation heater 5. FIG.

The present invention has been made on the basis of such knowledge, and the invention according to claim 1 of the present application is directed to a radiant heater disposed opposite to a sheet-like object traveling on a vertical or inclined predetermined path, and the sheet-like object. It is a heating apparatus for a sheet-like material having a baffle plate that is disposed over the entire area of at least one of the four surfaces that surround the space between the radiant heater and the space.

The invention according to claim 2 is the invention according to claim 1 , wherein the radiant heater is disposed opposite to a sheet-like object that travels from top to bottom, the sheet-like substance and the radiant heater, The baffle plates are arranged on both side surfaces of the space between.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the baffle plate is formed of a perforated plate or a wire mesh.

The heating device of the present invention is a state in which baffle plates are arranged over the entire area of at least one of the four surfaces surrounding the space between the sheet-like object and the radiant heater, and the entry and exit of air into the space is suppressed. in Ri by the fact that a configuration for performing non-contact heating of the sheet, the rising air flow generated in the space between the sheet and the radiant heater during the heating, even when raising the heating power by the heater radiate The speed can be kept low, thereby reducing the pressure difference acting on the sheet-like material while traveling and suppressing the occurrence of flutter phenomenon, increasing the traveling speed of the sheet-like material and improving productivity. it can.

Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a sheet-like material heating apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view showing the heating apparatus in the CC direction of FIG. The same parts as those in the conventional example shown are denoted by the same reference numerals. 1 and 2, 1 is a sheet-like material such as a resin film to be heated, and 2 and 3 are upper portions that support the sheet-like material 1 so as to travel from a top to a bottom along a predetermined vertical path. A roll and a lower roll, 5 is a radiant heater such as an infrared heater disposed opposite to a region of the sheet-like material 1 that runs between the upper and lower rolls 2 and 3 , and 11 is a sheet-like material. A baffle plate 12 is disposed on the entire area of at least one of the four surfaces surrounding the space 6 so as to suppress air from entering and leaving the space 6 between the radiant heater 5 and the radiation heater 5. It is the frame attached so that it might reinforce. In this embodiment, the baffle plate 11 is arranged only on both side surfaces among the four surfaces surrounding the space 6, that is, on both side surfaces and upper and lower end surfaces of the space. As the baffle plate 11, any structure can be used as long as it can provide resistance to the flow of air and suppress the entry and exit of air, and a non-porous plate material such as metal or plastic may be used. However, in this embodiment, a metal perforated plate such as stainless steel or a wire mesh is used. Here, the reason for using a metal perforated plate or wire mesh for the baffle plate 11 is that the heating region of the sheet-like object 1 can be monitored through the perforated plate or wire mesh, and the radiant heater 5 is released to the surroundings. This is to prevent deformation as much as possible when the baffle plate 11 is heated by the heat that is generated. The perforated plate or wire mesh used for the baffle plate 11 has an opening diameter D (the diameter of the opening in the case of a perforated plate, the length of one side of the opening in the case of a wire mesh) of 0.1 to 5 mm, and the pitch of the openings. It is desirable to be 1.1D to 1.5D.

  In the heating apparatus having the above configuration, the sheet-like object 1 continuously travels downward in front of the radiant heater 5, and the radiant heater 5 heats the sheet-like object 1 in a non-contact manner. During this heating, the air in the space 6 between the sheet-like object 1 and the radiant heater 5 also rises in temperature, and an upward airflow is generated in the space 6. As shown in FIG. 3A, when the baffle plates are not provided on both side surfaces of the space 6 between the sheet-like object 1 and the radiant heater 5 and both side surfaces of the space 6 are free, the air in the space 6 When the air is heated and flows upward, the surrounding air freely flows into the space 6 as shown by the arrow D, and as a result, a high-speed updraft is generated in the space 6 and its static pressure is reduced. A large difference occurs in the pressure acting on both surfaces of the sheet-like material 1, and a flutter phenomenon occurs in the sheet-like material 1. On the other hand, as shown in FIG. 3B, if baffle plates 11 are provided on both side surfaces of the space 6, the flow of air trying to flow into the space 6 from both side surfaces of the space 6 is suppressed. . For this reason, the rising speed when the air in the space 6 is heated and raised is suppressed, and the generation of the rising air current cannot be prevented, but the speed of the rising air current is greatly reduced. Thus, the pressure difference between the two surfaces of the sheet-like object 1 is reduced and the flutter phenomenon is less likely to occur, and the traveling speed of the sheet-like object 1 can be increased and the heating output of the radiant heater 5 can be increased. As a result of confirmation by the present inventors, a resin film having a thickness of 120 to 170 μm was used as the sheet-like material 1, the path length between the upper and lower rolls 2 and 3 was 130 to 140 cm, and the effective heating length was 110 to 120 cm. When the sheet-like object 1 is heated to about 140 to 170 ° C. using an infrared heater as the radiant heater 5, if the baffle plate 11 is not provided, a flutter phenomenon is likely to occur. 40-50 m / min was the limit, but by using the baffle plate 11, even if the output of the infrared heater is increased by a factor of about 2 and the traveling speed of the sheet 1 is increased to 80-100 m / min, The flutter phenomenon did not occur much. Thus, by using the heating device shown in FIGS. 1 and 2, the traveling speed of the sheet-like article 1 can be significantly increased, and the productivity can be greatly improved.

  In the embodiment shown in FIGS. 1 and 2, the baffle plates 11 are provided on both side surfaces of the space 6 between the sheet-like object 1 and the radiant heater 5 to suppress the air from entering and leaving the space 6. However, the installation position of the baffle plate 11 is not limited to this, and it is not only provided on one side surface of the space 6 or on both side surfaces, or instead of being provided on both side surfaces, the lower end surface of the space 6 and Alternatively, it may be changed so as to be provided on the upper end surface. By providing the baffle plate on the lower end surface of the space 6, it is possible to suppress the air flowing into the space 6 from the lower end surface and suppress the upward air flow. Further, by providing a baffle plate on the upper end surface of the space 6, the upward air flow can be suppressed by suppressing the air flowing out from the space 6. In the embodiment shown in FIG. 1, the radiant heater 5 is disposed immediately above the lower roll 3, and the lower end of the space 6 is blocked by the lower roll 3. Inflow of air from the lower end of the space 6 is not so much, and therefore the effect of providing a baffle plate on the lower end surface of the space 6 is not so great, but when the gap between the radiant heater 5 and the lower roll 3 is wide Thus, when the lower part of the space 6 is greatly open, it is very effective for preventing the upward airflow by providing a baffle plate at the lower end surface of the space 6 to prevent the inflow of air into the space 6.

  In the above-described embodiment, the sheet-like object 1 traveling downward along the vertical path is heated by the radiant heater 5 disposed opposite thereto, but the sheet-like object 1 to be heated is used. The travel route is not limited to this, and may be a vertical route in which the sheet-like object 1 travels upward, or may be a route traveled in an oblique direction. As shown in the illustrated embodiment, when the sheet-like object 1 traveling downward along a vertical path is heated by the radiant heater 5 disposed opposite to the sheet-like object 1, the rising airflow is large and Since the relative speed of the ascending airflow with respect to the sheet-like material is also increased, the flutter phenomenon is likely to occur, and the effect of applying the present invention is great.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this embodiment, and it is needless to say that the present invention can be appropriately changed within the scope of the claims. .

Schematic sectional view of a heating device according to an embodiment of the present invention CC sectional view of FIG. (A) is a schematic front view of a sheet-like material for explaining a situation where an updraft is generated between the sheet-like material and the radiant heater when no baffle plate is provided, and (b) is an updraft on the baffle plate. Schematic front view of sheet-like material, explaining the situation to suppress Schematic sectional view of a conventional heating device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet-like material 2 Upper roll 3 Lower roll 5 Radiation heater 6 Space 11 Baffle plate 12 Frame

Claims (3)

Over the entire area of at least one of the four surfaces surrounding the space between the sheet-like material and the radiant heater, and the radiant heater arranged opposite to the sheet-like material traveling along a predetermined path that is vertical or inclined A heating apparatus for a sheet-like object that is arranged and has a baffle plate that suppresses the entry and exit of air into the space.   The radiant heater is disposed so as to face a sheet-like object traveling from top to bottom, and the baffle plates are arranged on both side surfaces of a space between the sheet-like substance and the radiant heater. The sheet-like material heating apparatus according to claim 1.   3. The sheet heating apparatus according to claim 1, wherein the baffle plate is formed of a perforated plate or a wire mesh.

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