JP4689886B2 - Tenta oven - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for removing volatile components in hot air of a tenter oven that circulates hot air to a heater and a blower to stretch a sheet-like film in the transverse direction and / or longitudinal direction.
[0002]
[Prior art]
In a tenter oven that heats and softens the film by blowing hot air from the top and bottom of the sheet-like film that is continuously sent horizontally and stretches in the horizontal or vertical and horizontal directions, the hot or hot air that heats the film is ducted from the tenter oven body. The structure in which the air is sent to the blower and the heater, the temperature is adjusted by the heater, and the air is circulated again to the hot air blowing nozzle in the main body by the supply duct belongs to a known technique.
[0003]
A conventional film transverse stretching apparatus disclosed in Japanese Patent Application Laid-Open No. 9-150455 injects hot air heated to a predetermined temperature by a radiator placed on the lateral side of the film running section of the apparatus main body onto the upper and lower sides of the stretched film. Then, when stretching while repeating the operation of heating the sprayed hot air again with the radiator and spraying it onto the stretched film, the hot air sprayed on the upper side of the stretched film is guided to the lower part of the radiator with the baffle plate and heated. The hot air jetted downward is guided to the upper part of the radiator with a baffle plate, heated and stretched to reduce the temperature variation of the stretched film and improve the thickness accuracy of the stretched film. is there.
[0004]
Further, in the conventional plastic heating device disclosed in Japanese Patent Laid-Open No. 5-253434, a part of the circulating hot air is branched, and the branched hot air is cooled to make gaseous impurities in the hot air into liquid droplets. This is an impurity removal method and apparatus for a plastic heating device that recovers and removes impurities, and returns the hot air from which impurities have been separated and removed to a regular circulation path, and efficiently removes impurities in the circulating hot air without causing combustion. The purpose is that.
[0005]
[Problems to be solved by the invention]
As shown in FIG. 7 which is a cross-sectional view of a conventional tenter oven body, a hot air nozzle, plenum ducts 3 and 4 for supplying hot air to the hot air nozzle, and a film 17 are laterally disposed in a heating section 31 of the tenter oven body. Since the film clip to be sent while stretching in the direction and the traveling rail of the same clip are installed, the cross-sectional area and volume are large, and the flow of hot air in the conventional oven body is sucked as shown by D and E There are those that are sucked into the duct 11 immediately and those that are sucked after being stagnated for a while, the temperature of the stagnant air is lowered, the vaporized lubricating oil and oligomers are condensed into droplets, and the walls and ceiling of the tenter oven It adheres to and deposits on the film, soils the oven wall, or changes its quality during stagnation and mixes with hot air that circulates to contaminate the film surface. Failure occurs.
[0006]
Even in the film stretching device in which the radiator of the conventional example is placed on the lateral side of the film running unit, the hot air on the return side is once opened in a wide room of the device body, and then guided to the radiator by the baffle plate. There is a portion where the flow of hot air stagnate, and it is inevitable that the temperature varies and the condensed lubricating oil or oligomer adheres to the inner wall of the apparatus.
[0007]
The present invention provides a tenter oven in which lubricating oil and oligomers in hot air after film heating are removed to the outside of the main body and they are prevented from condensing and dropping from the ceiling of the main body or adhering and depositing on the inner wall. With the goal.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides (1) a tenter oven including a heating section that heats and softens a film by blowing hot air onto a continuously-fed sheet-like film and stretches in the transverse direction and / or the longitudinal direction. A plurality of plenum ducts having gaps for blowing hot air heated by a heater are disposed inside the main body of the heating section, and a suction port for blowing in hot air after heating the film is blown out from the gaps of the plenum ducts. A suction duct that circulates the hot air after heating the film to the heater is connected to the suction port. The suction duct is branched from the suction duct and is again connected to the suction duct. A branching duct that joins is connected, and a cooling heat exchanger that removes volatile components in the hot air is inserted into the branching duct, and the suction duct is inserted. The saw duct and / or branch ducts, tenter oven, characterized in that a branch flow adjusting unit for adjusting the flow rate of the hot branch to branch duct from the suction duct.
[0009]
(2) The tenter oven according to (1), wherein the branch flow rate adjusting device is a damper provided downstream of a branch duct and a portion where the branch duct of the suction duct branches. oven.
[0010]
(3) In the tenter oven described in (1) above, the cooling heat exchanger is installed on or near the installation floor surface of the tenter oven, so that the cooling heat exchanger can be easily removed, replaced, and cleaned. Tenta oven characterized by that.
[0011]
(4) In the tenter oven according to (1), the cooling heat exchanger includes a plurality of hollow plates having elongated gaps through which hot air passes, and a direction perpendicular to the flow direction of the hot air is provided between the plurality of hollow plates. A tenter oven characterized by having a liquid reservoir at the bottom of the cooling heat exchanger main body for cooling the hot air by flowing cooling air through it and collecting condensed volatile component droplets.
[0012]
(5) In the tenter oven according to (1), a porous rectifying plate is provided in the heating section body to partition a space on the side where the plenum duct is arranged and a space on the suction port side. Tenta oven,
Each of these is used as a means for solving problems.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A structure and an effect | action are demonstrated based on figures about the heating section of the tenter oven which is embodiment of this invention. 1 is a side sectional view showing a heating section of a tenter oven, FIG. 2 is a plan view showing a section AA in FIG. 1, FIG. 3 is a plan view showing a section BB in FIG. 1, and FIG. FIG. 5 is a side view showing a cross section taken along the line CC, FIG. 5 is a side view showing a porous portion of the rectifying plate in FIG. 1, and FIG. 6 is a perspective view showing a heat exchanger part of the volatile component removing apparatus in FIG.
[0014]
In FIG. 1, reference numeral 2 denotes a main body excellent in heat insulating properties in which a heat insulating material is sandwiched between double walls. The film 17 spread horizontally in the center of the main body 2 is clipped to the clip chain 18 that runs horizontally on both edges, and is sent while widening the film width.
[0015]
The air in the body is heated from the suction duct 11 and the junction duct 12 through the heater 8, pressurized and sent by the blower 10, and separated from the main duct 7 up and down through the branch ducts 5 and 6. 6 is divided into a large number of plenum ducts 3, 4, and hot air pressurized from a narrow gap between the plenum ducts 3, 4 is blown out and heated to the upper and lower surfaces of the film 17, and then the hot air is sucked into the suction ducts 11 a, 11 b. 11 and then into the confluence duct 12. On the other hand, part of the hot air passing through the circulating suction duct 11 is branched into the branch duct 25 and guided downward, cooled through the volatile component removing device 24 installed in the branch duct 25, and the volatile components condensed. Then, after being removed, it joins the original hot air that is guided upward and branched, enters the joining duct 12, and circulates to the heater 8 and the blower 10. The suction duct 11 after the branch duct 25 branches and the branch duct 25 are provided with dampers 27 and 28 for adjusting the air passage area, respectively, so that the amount of air branched into the branch duct 25 is adjusted. . Reference numeral 19 denotes a partition wall. The dampers 27 and 28 can adjust the amount of air branched into the branch duct 25 by only one of them.
[0016]
As shown in the perspective view of FIG. 6, the volatile component removing device 24 is an air-cooled heat exchanger, has an elongated gap, and a large number of hollow cooling plates 24a are arranged side by side on the flange plates 24b and 24c. The heat exchanger is configured to pass the hot air to be passed through the gap between the hollow cooling plates 24a and to cool the cooling air sent from the blower 26 by flowing in the direction perpendicular to the flow direction H of the hot air (in the direction of arrow S in FIG. 6). Although not shown, the condensed liquid droplets are collected in a liquid reservoir installed below. It can be attached to and detached from the branch duct 25 via flange plates 24b and 24c, and the volatile component removing device 24 can be inspected and cleaned by being detached from the branch duct 25.
[0017]
The temperature of the hot air passing through the plenum ducts 3 and 4 is detected by a temperature detection sensor (not shown), and the heating amount of the heater 8 is controlled by a control device (not shown) so that the specified stretching temperature of the film 17 is reached. Before the hot air is sucked into the suction duct 11 from the suction ports 11a and 11b, it passes through the rectifying plates 15 and 16 (a large number of punch holes 15a and 16a are opened as shown in FIG. 5). To do. The opening ratio of the rectifying plates 15 and 16 is about 30%, and the hot air flows into the suction ports 11a and 11b evenly from the punch holes 15a and 16a on the entire surface by a pressure difference before and after passing through the rectifying plates 15 and 16. A part of the hot air can flow into the suction ports 11 a and 11 b of the suction duct 11 without stagnation in the room of the main body 2.
[0018]
As shown in FIG. 7, when there are no rectifying plates 15, 16 in the main body 2, hot air travels as short as possible toward the suction ports 11 a, 11 b of the suction duct 11. Hot air stagnates in the corners shown. Since the portion where such hot air stagnates is close to the wall of the main body 2, the temperature is lowered, and the oligomer gas evaporated from the film 17 and the petroleum-based gas evaporated from the lubricating oil in the running portion of the clip chain 18 are condensed. The surface of the film 17 can be contaminated by adhering to the inner wall of the main body 2 or mixing with the hot air that changes in quality and circulates during stagnation and partially passes through the filter 9 and reaches the plenum ducts 3 and 4. There is sex.
[0019]
If the current plates 15 and 16 are present, the hot air does not stagnate in the interior of the main body 2, so that the petroleum gas evaporated from the oligomer gas or the lubricating oil does not condense. A part branches to the branch duct 25, and the volatile components are condensed and removed through the volatile component removing device 24 installed in the branch duct 25, so that the gas such as oligomer generated during the heating of the film 17. The concentration of can be suppressed.
[0020]
Even when it is necessary to dry the wet film 17 by coating the liquid on the film surface, the configuration of the main body 2 in the heating section 1 of the tenter oven is used as it is as the drying section of the drying apparatus. can do.
[0021]
In this drying process, the hot air heated and dried by the heater 8 is sent by the blower 10, and passes through the main duct 7, the diverting ducts 5, 6, and the upper and lower surfaces of the film 17 from the narrow gaps of the plenum ducts 3, 4. The film 17 is blown out and the film 17 is dried, and the warm hot air is collected in the suction duct 11, and most of the hot air passing through the suction duct 11 is branched into the branch duct 25 and guided downward, and is installed in the middle of the branch duct 25. It is cooled through the volatile component removing device 24 that has been cooled to condense and remove the water vapor of the moist air, and is then guided upward to join the original warm air into the merging duct 12, and the heater 8 and the blower Circulate to 10.
[0022]
The temperature of the hot air passing through the plenum ducts 3 and 4 is detected by a temperature detection sensor (not shown), and the temperature of the hot air passing through the plenum ducts 3 and 4 is controlled by controlling the heating amount of the heater 8 in a control device (not shown). Set to the specified drying temperature.
[0023]
Similar to the heating section 1 of the tenter oven, the warm air in the section passes through the rectifying plates 15 and 16 in which a large number of punch holes 15a and 16a provided in the main body 2 are opened. Due to the pressure difference generated before and after passing through 16, the punch holes 15a, 16a of the entire area flow into the chamber on the suction port 11a, 11b side of the suction duct 11 at an equal speed, and part of the hot air stagnates in the chamber of the main body 2 It can be made to flow in suction duct 11 without doing.
[0024]
If the current plates 15 and 16 are provided, the hot air will not stagnate in the interior of the main body 2, so that the water vapor contained in the hot air does not condense on the walls or ceiling in the main body 2, It won't get wet or dirty.
[0025]
【The invention's effect】
The tenter oven of the present invention connects a suction duct to the suction port of the heating section main body, guides hot air to the branch duct connected to the suction duct, and gas such as oligomer gas in the hot air or petroleum-based gas evaporated from the lubricating oil, etc. The volatile components can be condensed and removed with a heat exchanger for cooling, and such volatile components can be condensed on the ceiling part of the heating section body, which can be dropped and contaminate the film surface. (Claim 1).
[0026]
In addition, in the case where dampers are provided in each of the branch duct and the suction duct, the entire hot air from the heating section is guided to the branch duct and the volatile components are condensed and removed by the cooling heat exchanger, and the cooling heat exchanger is passed. Without any operation, the entire amount is circulated directly from the suction duct to the heater, or the hot air flow branched into the branch duct is adjusted to a predetermined ratio, and the volatile components are condensed and removed with respect to the predetermined hot air flow. It is possible to select them and to operate an efficient tenter oven considering the concentration of volatile components in the heating section body (claim 2).
[0027]
When the cooling heat exchanger is installed on the installation floor of the tenter oven or in the vicinity thereof, the cooling heat exchanger can be easily removed, replaced, and cleaned.
[0028]
In addition, the cooling heat exchanger is air-cooled, and the condensed volatile component droplets are collected in a liquid reservoir placed at the bottom of the cooling heat exchanger, so that the heat exchanger can be handled, removed, replaced, Cleaning becomes easier (Claim 4).
[0029]
In the heating section body of the tenter oven, a porous rectifying plate that divides the space on the plenum duct side and the space on the suction port side is provided. Hot air after film heating is rectified and sucked from the plenum duct side space by the porous partition plate. As a result of the transition to the mouth side space, hot air does not stagnate in the corner of the plenum side space and stagnate in the same space, and the film sent in the plenum side space is contaminated with volatile components in the hot air trapped in the space. Can be eliminated (claim 5).
[0030]
In addition, the structure of the same main body can be used also as a hot air dryer by using said heat exchanger for cooling of volatile component removal as a water vapor removal apparatus in circulating hot air.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a heating section of a tenter oven according to a first embodiment of the present invention.
2 is a plan view showing an AA cross section of FIG. 1. FIG.
FIG. 3 is a plan view showing a BB cross section of FIG. 1;
4 is a side view showing a CC cross section of FIG. 1; FIG.
5 is a side view showing a part of a porous portion of the current plate shown in FIG. 1. FIG.
6 is a perspective view showing a heat exchanger part of the volatile component removal apparatus of FIG. 1. FIG.
FIG. 7 is a side cross-sectional view of a heating section of a conventional tenter oven.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heating section 2 Main body 3, 4 Plenum duct 7 Main duct 8 Heater 10 Blower 11 Suction duct 12 Merge ducts 15 and 16 Current plate 17 Film 24 Volatile component removal apparatus 25 Branch ducts 27 and 28 Damper

Claims (5)

In a tenter oven including a heating section that heats and softens the film by blowing hot air onto a continuously fed sheet-like film and stretches in the transverse direction and / or the longitudinal direction.
A plurality of plenum ducts having gaps for blowing hot air heated by a heater are disposed inside the main body of the heating section, and a suction port for blowing in hot air after heating the film is blown out from the gaps of the plenum ducts. In the body of the section,
A suction duct that circulates hot air after heating the film to the heater is connected to the suction port,
A branch duct that branches from the suction duct and merges with the suction duct is connected to the suction duct.
The branch duct is provided with a cooling heat exchanger for removing volatile components in the hot air,
A tenter oven comprising a branch flow rate adjusting device for adjusting a flow rate of hot air branched from the suction duct to the branch duct in the suction duct and / or the branch duct. 2. The tenter oven according to claim 1, wherein the branch flow rate adjusting device is a damper provided downstream of a branch duct and a portion where the branch duct of the suction duct branches. The tenter oven according to claim 1, wherein the cooling heat exchanger is installed on or near the installation floor of the tenter oven to facilitate removal, replacement, and cleaning of the cooling heat exchanger. Tenta oven. 2. The tenter oven according to claim 1, wherein the cooling heat exchanger includes a plurality of hollow plates having elongated gaps through which hot air passes, and the cooling air flows between the plurality of hollow plates in a direction perpendicular to the flow direction of the hot air. A tenter oven characterized by having a liquid reservoir for cooling the hot air and collecting condensed volatile component droplets at the bottom of the cooling heat exchanger body. The tenter oven according to claim 1, wherein a porous rectifying plate is provided in the heating section main body to partition a space on the side where the plenum duct is arranged and a space on the suction port side.

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