JP2023130165A - Heater - Google Patents

Abstract

To prevent interference with a film.SOLUTION: A heater 100, designed to heat a film during its conveyance, includes: a body part 10 that has an internally defined heating chamber and also has a passage port which is opened to the heating chamber to allow the passage of a film; and a support mechanism 40 that supports a film during its conveyance. The support mechanism 40 includes a pair of support parts that is provided on an inner periphery of the passage port, faces each other vertically across the film, and sprays a gas to the film.SELECTED DRAWING: Figure 4

Description

The present invention relates to a heating device.

Patent Document 1 discloses a film stretching apparatus that includes a stretching furnace that is separated into a plurality of air volume control zones along the film transport direction.

Japanese Patent Application Publication No. 2018-47695

As disclosed in Patent Document 1, in a film stretching apparatus for stretching a film, the film is stretched while controlling the temperature of the film using a heating device having a plurality of heating chambers. Generally, in such a stretching device, a plurality of heating chambers are partitioned by a partition, and the film is conveyed through a passage hole formed in the partition.

It is desirable that the passage opening formed in the partition has a small opening area so that the temperature of the heating chamber does not change due to the airflow moving between the heating chambers.

On the other hand, the film being transported may be displaced or sagged in the vertical direction due to changes in the air flow in the heating chamber or the transport speed. Therefore, if the opening area of the passage port is made small, there is a risk that the film may interfere with the inner wall of the passage hole due to displacement or sagging.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a heating device that prevents interference with the film.

A heating device that heats a film to be transported includes a main body portion in which a heating chamber is divided and a passage opening that opens into the heating chamber and allows the film to pass through, and a support that supports the film to be transported. The support mechanism includes a pair of support parts provided on the inner periphery of the passage port and facing each other with the film in between in a direction perpendicular to the film and spraying gas onto the film.

According to this aspect, the pair of support parts spray the gas, thereby supporting the film and suppressing displacement of the film in the vertical direction. Since the pair of support parts are provided on the inner periphery of the passage opening, interference between the inner wall of the passage opening and the film can be effectively prevented.

1 is a plan view showing the overall configuration of a stretching device according to an embodiment of the present invention. FIG. 1 is a sectional view showing a heating device according to an embodiment of the present invention. 3 is a sectional view taken along line III-III in FIG. 2. FIG. FIG. 2 is an enlarged sectional view showing a support mechanism of a heating device according to an embodiment of the present invention. FIG. 2 is an enlarged view showing the configuration of a support section of a heating device according to an embodiment of the present invention.

Hereinafter, a heating device 100 according to an embodiment of the present invention will be described with reference to the drawings. Note that in each drawing, the scale of each component has been changed as appropriate for convenience of explanation, and is not necessarily exactly illustrated. Further, for a plurality of identical configurations, only some of them may be labeled with reference numerals, and the other components may be omitted.

As shown in FIG. 1, the heating device 100 is used in a stretching device 1 that stretches a film to be stretched while conveying it. In addition, in FIG. 1, the heating device 100 is illustrated in a simplified manner by broken lines.

The stretching device 1 conveys a film (not shown) in one direction from the inlet side (left side in FIG. 1) to the outlet side (right side in FIG. 1), while conveying the film in the longitudinal direction (hereinafter referred to as This is a so-called lateral stretching machine that stretches in a lateral direction (hereinafter also referred to as ``TD direction'') perpendicular to the ``MD direction''. The stretching device 1 is not limited to a transverse stretching machine, and may be, for example, a so-called simultaneous biaxial stretching device that simultaneously stretches in the MD direction and the TD direction. In the following explanation, "right side" refers to the right side (bottom side in Figure 1) when looking from the inlet side to the exit side, and "left side" refers to the left side (top side in Figure 1) when looking from the inlet side to the exit side. ).

The stretching device 1 includes a pair of rail devices 7L and 7R that define an endless circulation path and are arranged on both left and right sides of the film, and a plurality of clips that run along the circulation path of the pair of rail devices 7L and 7R and grip the film. It includes a unit 3 and a heating device 100 that heats the film being transported.

The pair of rail devices 7L and 7R are each configured by a reference rail 8 that defines a circulation path for circulating the clip unit 3.

The reference rail 8 is formed by a plurality of rotatably connected rail units and an intermediate rail portion that complements adjacent rail units, although detailed illustrations and explanations will be omitted since this is a well-known configuration. . That is, the ends of the rail units are each rotatably connected to the intermediate rail section. In this way, adjacent rail units are rotatably connected to each other via the intermediate rail portion, so that a desired circulation path can be formed by changing the arrangement of the plurality of rail units.

Since the configuration of the clip unit 3 can employ a known configuration, detailed illustrations and explanations will be omitted. Adjacent clip units 3 on the circulation path are connected by a link mechanism (not shown). That is, the plurality of clip units 3 are connected endlessly by the link mechanism.

The plurality of clip units 3 are driven along the circulation route by a drive mechanism (not shown). Specifically, the plurality of clip units 3 are guided by the reference rails 8 of the pair of rail devices 7L and 7R, respectively, and move around in a loop. The clip unit 3 moves clockwise in FIG. 1 in the right rail device 7R, and counterclockwise in the left rail device 7L. In the pair of rail devices 7L and 7R, the same number of clip units 3 circulate.

Since the drive mechanism can employ a known configuration, detailed explanation will be omitted. To give an example, the drive mechanism includes an electric motor that drives a pair of inlet sprockets 5L and 5R provided on the inlet side that supplies the film, and a pair of outlet sprockets 6L and 5R provided on the outlet side that sends out the stretched film. An electric motor that drives the 6R.

Each clip unit 3 sequentially engages and disengages from the inlet sprockets 5L, 5R and the outlet sprockets 6L, 6R, which are rotationally driven, so that each clip unit 3 travels along a circulating route. power is given.

The stretching device 1 includes a lateral adjustment mechanism (not shown) that adjusts the distance between the left and right rail devices 7L, 7R. The lateral adjustment mechanism is, for example, a linear motion mechanism having a screw mechanism connected to an electric motor or a manual handle, and moves the rail unit in the left-right direction. Since the lateral adjustment mechanism can employ a known configuration, illustrations and detailed explanations will be omitted.

The operation of the drive device and the lateral adjustment mechanism for moving the clip unit 3 is controlled by a controller (not shown).

At the entrance portion where the film is taken in, both side edges of the film are gripped by clip units 3 running on left and right circulation paths. The film gripped by the clip unit 3 is transported along the transport direction as the clip unit 3 moves. The conveyed film is released from the grip of the clip unit 3 on the exit side and continues straight. In this way, the film gripped by the clip unit 3 is conveyed from the entrance side to the exit side.

Note that, as shown in FIG. 2, the film is transported in one direction along a predetermined plane (hereinafter referred to as "film transport surface P"). The film transport surface P is, for example, a virtual plane parallel to the horizontal plane. In the following explanation, terms such as perpendicular or parallel to the film do not mean perpendicular or parallel to the film that is actually transported, but perpendicular or parallel to the film transport surface P (in other words, (perpendicular or parallel to the film ideally transported so as to be parallel to plane P).

In the stretching device 1, the area where the left and right rail devices 7L and 7R face each other is configured as a film transport area TA. In the film transport area TA, a preheating zone Za, a stretching zone Zb, and a heat treatment zone Zc are arranged (allocated) in this order from the entrance side to the exit side of the stretching apparatus 1. Note that each zone is not limited to a configuration formed as one zone, and may be configured as a plurality of zones.

In the preheating zone Za, the distance between the left and right circulation paths (that is, the TD pitch) is set to correspond to the initial width of the film, and the left and right circulation paths are arranged parallel to each other over the entire area. Therefore, in the preheating zone Za, the film is not laterally stretched, but only the process of preheating the film to a temperature at which it can be stretched is performed.

In the stretching zone Zb, the distance between the left and right circulation paths gradually increases from the preheating zone Za side toward the heat treatment zone Zc. That is, in the stretching zone Zb, the left and right circulation paths are provided in a shape that widens toward the end, with the interval increasing from the inlet side to the outlet side. Therefore, in the stretching zone Zb, the lateral distance (TD pitch) between the clip units 3 gradually increases. Therefore, in the stretching zone Zb, the film is stretched in the TD direction (lateral stretching).

The film that has passed through the stretching zone Zb and has been subjected to simultaneous biaxial stretching in the transverse direction and the longitudinal direction, then enters the heat treatment zone Zc. In the heat treatment zone Zc, the distance between the left and right circulation paths is set to correspond to the width of the stretched film, and the left and right circulation paths are arranged parallel to each other over the entire area. Therefore, in the heat treatment zone Zc, neither lateral nor longitudinal stretching of the film is performed, but only heat treatment such as temperature adjustment is performed.

Next, the configuration of the heating device 100 will be explained.

As shown in FIG. 2, the heating device 100 has a substantially box-shaped main body portion 10 provided so as to cover the film transport area TA.

The main body 10 has a plurality of heating chambers (three heating chambers in this embodiment) corresponding to each zone of the film transport area TA. Specifically, the interior of the main body portion 10 is divided into a preheating chamber 21, a stretching chamber 22, and a heat treatment chamber 23 as heating chambers. The inside of the preheating chamber 21 corresponds to a preheating zone Za, the inside of the stretching chamber 22 corresponds to a stretching zone Zb, and the inside of the heat treatment chamber 23 corresponds to a heat treatment zone Zc. Note that hereinafter, the preheating chamber 21, the stretching chamber 22, and the heat treatment chamber 23 are also collectively referred to simply as a "heating chamber."

The main body 10 includes an inlet wall 11 that partitions a preheating chamber 21 from the outside of the main body 10 , an outlet wall 12 that partitions a heat treatment chamber 23 from the outside of the main body 10 , and a partition that partitions the preheating chamber 21 and the stretching chamber 22 . The first partition wall 13 serves as a section, and the second partition wall 14 partitions the stretching chamber 22 and the heat treatment chamber 23. Hereinafter, the inlet wall 11, the outlet wall 12, the first partition wall 13, and the second partition wall 14 will be collectively referred to as a "partition section."

The entrance wall 11 is formed with an entrance 11a through which the film is introduced. Further, the exit wall 12 is formed with an exit 12a through which the film is taken out.

A first passage port 13a is formed in the first partition wall 13 as a passage port through which the film passes. A second passage port 14a is formed in the second partition wall 14 as a passage port through which the film passes. The inlet 11a, the outlet 12a, the first passage port 13a, and the second passage port 14a allow the film, the reference rail 8, and the clip unit 3 to pass through, respectively. In this way, the inlet 11a, the outlet 12a, the first passage port 13a, and the second passage port 14a each correspond to a "passing port" formed in the partition so as to open into the heating chamber and allowing the film to pass through. .

More specifically, in relation to the preheating chamber 21, the inlet 11a and the first passage port 13a correspond to a "pass port". In relation to the stretching chamber 22, the first passage port 13a and the second passage port 14a correspond to "pass ports". In relation to the heat treatment chamber 23, the second passage port 14a and the outlet 12a correspond to "pass ports".

Further, as shown in FIG. 3, on the upstream and downstream sides of the inlet wall 11, the outlet wall 12, the first partition wall 13, and the second partition wall 14, an inlet 11a, an outlet 12a, a first passage port 13a, A pair of slide covers 17L and 17R that can partially close the second passage port 14a are provided. Although FIG. 3 shows the slide covers 17L and 17R provided on the upstream side of the first partition wall 13, the slide covers 17L and 17R are shown on the downstream side of the first partition wall 13, the inlet wall 11, the outlet wall 12, and the second partition wall. The slide covers provided on the upstream and downstream sides of each of No. 14 have a similar configuration. In the following, the slide covers 17L and 17R provided on the upstream side of the first partition wall 13 will be explained, and the explanation of the other slide covers will be omitted. The left side of FIG. 3 shows a state in which the lateral distance between the rail devices 7L and 7R is minimum (hereinafter also referred to as "minimum rail width"), and the right side shows a state in which it is maximum (hereinafter also referred to as "maximum rail width"). .) is shown. Further, in FIG. 3, the first passage port 13a hidden by the slide covers 17L and 17R is shown by a two-dot chain line, and the support mechanism 40, which will be described later, is shown by a broken line. Further, in FIGS. 2 and 4, illustration of the slide covers 17L and 17R is omitted.

The pair of slide covers 17L and 17R are each formed into a substantially U-shape having a slit 17a that opens toward the center of the film in the left-right direction, and are substantially symmetrical to each other with respect to the center of the film in the left-right direction. Placed. The opening width of the slit 17a (the dimension in the direction perpendicular to the film transport surface P) is formed to be approximately the same as that of the first passage port 13a. The slit 17a allows the film, clip unit 3, and rail devices 7L and 7R to pass through. Note that in FIGS. 2 and 4, illustrations of the film, clip unit 3, rail devices 7L, 7R, etc. are omitted.

The pair of slide covers 17L, 17R are each movable laterally. Specifically, the left slide cover 17L moves laterally as the left rail device 7L moves laterally by the lateral adjustment mechanism. Similarly, the right slide cover 17R moves laterally as the right rail device 7R moves.

In order to allow films of various widths to pass through, the first passage port 13a has a horizontal length set according to a wide film. Therefore, when a relatively narrow film passes through, a part of the outside of the first passage opening 13a in the lateral direction becomes a space through which the film does not pass. Gas may move between the heating chambers or the exterior of the main body 10 through spaces through which such films do not pass.

In contrast, in this embodiment, the pair of slide covers 17L, 17R move laterally along with the rail devices 7L, 7R. When the rail devices 7L and 7R are moved closer to each other in the lateral direction in accordance with the width of the film, the slide covers 17L and 17R are moved accordingly, and the slide covers 17L and 17R move the first passage port 13a in the lateral direction. A part of the outside (the cross-hatched part in FIG. 3) is closed. Thereby, it is possible to suppress the movement of gas between the heating chambers or with the outside of the main body part 10 through the portion of the first passage port 13a through which the film does not pass. As shown on the left side in FIG. 3, the pair of slide covers 17L, 17R can be used even when the horizontal distance between the left and right rail devices 7L, 7R is the minimum (the minimum width of the film supplied to the stretching device 1). It is desirable that the first passage opening 13a be formed so that the laterally outer portion through which the film does not pass is closed.

The heating device 100 further includes a temperature control device 30 that controls the temperature of the film being transported, and a support mechanism 40 that supports the film being transported.

The temperature control device 30 is provided in each of the preheating chamber 21, the stretching chamber 22, and the heat treatment chamber 23. Since the temperature control device 30 provided in each heating chamber basically has the same configuration, the specific structure will be explained below using the temperature control device 30 provided in the preheating chamber 21 as an example, and the temperature control device 30 provided in the stretching chamber 22 and the heat treatment Regarding the temperature control device 30 in the room 23, specific explanation and reference numbers will be omitted as appropriate.

The temperature control device 30 includes heating nozzles 31a and 31b as heating units that spray gas (air) at a predetermined temperature onto the film being transported to heat the film, and a heating unit that sprays gas to the heating nozzles 31a and 31b. It has a blower 32 as a gas supply source, and a heat exchanger 33 as a temperature adjustment section that adjusts the temperature of gas from the blower 32 to the heating nozzles 31a and 31b.

In the temperature control device 30, a plurality of pairs of heating nozzles 31a, 31b are arranged such that two heating nozzles 31a, 31b facing each other in the vertical direction of the film with the film being transported in between are arranged at a predetermined interval in the film transporting direction. It is set up empty. In this embodiment, three pairs of heating nozzles 31a and 31b are provided at intervals in the film transport direction. Note that the number of heating nozzles 31a and 31b is not limited to three pairs, and may be one or two pairs, or four or more pairs. Further, the number of heating nozzles 31a, 31b provided in each heating chamber is not limited to the same number, and may be set individually for each heating chamber.

A pair of heating nozzles 31a and 31b are opposed to each other in a direction perpendicular to the film with a predetermined distance therebetween. The vertical spacing between each heating nozzle 31a, 31b and the film is the same. Further, the heating nozzles 31a and 31b spray gas perpendicularly to the film. The three pairs of heating nozzles 31a and 31b are provided at equal intervals between the inlet wall 11 and the first partition wall 13, approximately at the center in the conveyance direction.

The gas discharged from the blower 32 is supplied to each heating nozzle 31a, 31b through a supply line 34, and is sprayed toward the film through each heating nozzle 31a, 31b. The gas in the preheating chamber 21 is sucked into the blower 32 through an exhaust line 35 configured with an exhaust duct (not shown) or the like. In this way, a gas circulation line is formed.

The heat exchanger 33 adjusts the gas passing through the supply line 34 connecting the blower 32 and the heating nozzles 31a, 31b to a desired temperature. Gas adjusted to a desired temperature is sprayed toward the film through heating nozzles 31a and 31b. This controls the temperature of the film.

In this embodiment, as shown in FIG. 2, a support mechanism 40 is provided on each of the entrance wall 11, the first partition wall 13, the second partition wall 14, and the exit wall 12, which are partitions. This suppresses displacement of the film inside the inlet 11a, the outlet 12a, the first passage port 13a, and the second passage port 14a. Since the configuration of each support mechanism 40 is basically the same, below, the support mechanism 40 that supports the film passing through the first passage port 13a will be explained as an example, and the other support mechanisms 40 will be explained in detail. Explanations and symbols will be omitted as appropriate. In addition, the blower 32 that supplies gas to the heating nozzles 31a, 31b of the preheating chamber 21 will be referred to as a "first blower 32a", and the blower 32 that supplies gas to the heating nozzles 31a, 31b of the stretching chamber 22 will be referred to as a "second blower". 32b". In addition, in FIG. 2, the structure of the support mechanism 40 is illustrated in a simplified manner with some structures omitted.

As shown in FIG. 4, the support mechanism 40 includes a pair of first support parts (support parts) that are provided on the inner periphery of the first passage port 13a and support the film by spraying gas onto the film. The first injection parts 41a and 41b, and a pair of second injection parts as a pair of second support parts (support parts) that are provided on the inner periphery of the first passage port 13a and support the film by spraying gas onto the film. It has parts 43a and 43b. In addition, in the other support mechanism 40, the first support part and the second support part are provided at one of the entrance 11a, the second passage opening 14a, and the exit 12a, which are passage openings, respectively.

Gas is supplied to the pair of first injection parts 41a, 41b by branching from a gas supply line from a first blower 32a as a first gas supply source to the heating nozzles 31a, 31b. Gas is supplied to the pair of second injection parts 43a and 43b from a second blower 32b as a second gas supply source. In this way, the gas supply source of the first injection parts 41a and 41b, which are supporting parts on the relatively upstream side, is the gas from the temperature control device 30 of the preheating chamber 21, which is a heating chamber on the upstream side of the first passage port 13a. It is used in common with the supply source (first blower 32a). Similarly, the gas supply source of the second injection parts 43a and 43b, which are supporting parts on the relatively downstream side, is the gas supply source of the temperature control device 30 of the stretching chamber 22, which is a heating chamber on the downstream side of the first passage port 13a. It is used in common with the source (second blower 32b). Note that a blower 32c that sucks in the outside (atmosphere) of the main body part 10 and discharges it is used as a gas supply source for the first injection part provided at the inlet 11a and the second injection part provided at the outlet 12a. The blower 32c may branch from a gas supply line to other injection parts and supply gas to the first injection part at the inlet 11a and the second injection part at the outlet 12a. Further, the gas supply sources may be separate for the temperature control device 30 and the support mechanism 40.

The pair of first injection parts 41a and 41b face each other in a direction perpendicular to the film transport surface P with the film transport surface P in between. Further, the pair of second jetting sections 43a and 43b face each other in a direction perpendicular to the film transport surface P with the film transport surface P in between. The pair of first jetting parts 41a, 41b are provided in line with the pair of second jetting parts 43a, 43b on the upstream side in the film transport direction.

FIG. 5 is an enlarged view of one of the first injection part 41a and the second injection part 43a viewed from the direction of arrow A in FIG. As shown in FIG. 5, the first injection parts 41a, 41b have a plurality of first injection ports 42 that open to the first passage port 13a. The plurality of first injection ports 42 have the same shape, for example, are formed in an oval shape as shown in FIG. 5 . The second injection parts 43a, 43b have a plurality of second injection ports 44 that open to the first passage port 13a. The plurality of second injection ports 44 have the same shape, for example, are formed in an oval shape as shown in FIG. 5 . In this way, the first injection parts 41a, 41b and the second injection parts 43a, 43b each constitute a part of the inner circumferential wall of the first passage port 13a of the first partition wall 13.

The central axes of the first injection ports 42 of the first injection sections 41a and 41b are provided perpendicularly to the film transport surface P. Moreover, the central axis of the second injection port 44 of the second injection section 43a, 43b is provided perpendicularly to the film transport surface P. Therefore, the angle at which the gas is sprayed by the first spraying parts 41a, 41b and the angle at which the gas is sprayed by the second spraying parts 43a, 43b are each perpendicular to the film.

Gas is sprayed onto the film through the first injection ports 42 of the pair of first injection parts 41a, 41b and the second injection ports 44 of the pair of second injection parts 43a, 43b, so that the film is is supported from both sides.

The plurality of first injection ports 42 and the plurality of second injection ports 44 are arranged uniformly at predetermined intervals in the film transport direction and width direction, respectively, on the inner wall of the first passage port 13a. As described above, the width of the film varies depending on the product specifications, and the lateral distance between the left and right rail devices 7L and 7R is set according to the width of the film. Therefore, the support mechanism 40 (a pair of first injection parts 41a, 41b and a pair of second injection parts 43a, 43b) has a minimum rail width so as not to interfere with the left and right rail devices 7L, 7R, which have become the minimum rail width. It is provided in a lateral range corresponding to the width of the rail, and is provided so as to spray gas over substantially the entire width direction of the film when the rail is at its minimum width. This prevents interference between the rail devices 7L, 7R and the support mechanism 40 when the left and right rail devices 7L, 7R are at the minimum rail width, while maintaining the maximum width even when the distance between the rail devices 7L, 7R becomes larger than the minimum rail width. It is possible to support the film by spraying gas on it over a wide range in the width direction.

Even when the distance between the left and right rail devices 7L, 7R becomes the maximum width of the rails, the slide covers 17L, 17R protect the space between the left and right rail devices 7L, 7R and the support mechanism 40 in the lateral direction from the transport direction. It is provided to cover. In other words, when the distance between the left and right rail devices 7L, 7R is the maximum rail width, a part of the slide covers 17L, 17R overlaps with the support mechanism 40 when viewed from the conveyance direction, and the slide covers 17L, 17R and the support mechanism 40 (see right side in FIG. 3).

One of the first spraying sections 41a and the second spraying section 43a provided above the film transport surface P are separated by a partition wall 49a. A first supply passage 47a and a second supply passage 48a are defined inside the first partition wall 13 by the partition wall 49a. Similarly, the other first injection section 41b and second injection section 43b provided below the film transport surface P are separated by a partition wall 49b. A first supply passage 47b and a second supply passage 48b are defined inside the first partition wall 13 by the partition wall 49b. The first supply passage 47a on the upper side of the film transport surface P and the first supply passage 47b on the lower side communicate with each other. The second supply passage 48a on the upper side of the film transport surface P and the second supply passage 48b on the lower side communicate with each other.

The first blower 32a sucks the gas in the preheating chamber 21 and supplies it to the first injection parts 41a, 41b through the first supply passages 47a, 47b. The second blower 32b sucks the gas in the stretching chamber 22 and supplies it to the second injection parts 43a, 43b through the second supply passages 48a, 48b. The temperature in the preheating chamber 21 and the temperature in the stretching chamber 22 are different from each other, and there is a temperature difference between the preheating chamber 21 and the stretching chamber 22. Therefore, the temperature of the gas sprayed by the first spray parts 41a, 41b and the temperature of the gas sprayed by the second spray parts 43a, 43b differ depending on the temperature difference between the preheating chamber 21 and the stretching chamber 22.

Further, the amount (total amount) of gas injected by the pair of first injection parts 41a, 41b is smaller than the amount (total amount) of gas injected by the entire three pairs of heating nozzles 31a, 31b provided in the preheating chamber 21. Moreover, the distance between the first jetting parts 41a, 41b and the film transport surface P in the direction perpendicular to the film transport surface P is greater than the distance between the heating nozzles 31a, 31b of the preheating chamber 21 and the film transport surface P. It's also short. Similarly, the amount of gas injected by the entire second injection portions 43a and 43b is smaller than the amount of gas injected by the entire three pairs of heating nozzles 31a and 31b provided in the stretching chamber 22. The distance between the second injection parts 43a, 43b and the film transport surface P in the direction perpendicular to the film transport surface P is shorter than the distance between the heating nozzles 31a, 31b of the stretching chamber 22 and the film transport surface P. .

With this configuration, the film can be sufficiently supported even if the amount of gas sprayed from the first spray parts 41a, 41b and the second spray parts 43a, 43b is small. Moreover, the preheating chamber 21 and the stretching chamber 22 are caused by the flow of the gas injected by the first injection parts 41a, 41b into the stretching chamber 22, and the inflow of the gas injected by the second injection parts 43a, 43b into the preheating chamber 21. Temperature changes can be suppressed.

Note that the amount of gas sprayed onto the film by each of the pair of first spray parts 41a and 41b is the same. The amount of gas sprayed onto the film by each of the pair of second spray parts 43a and 43b is the same.

Next, the operation of the heating device 100 will be explained.

In general, in a heating device, the film may warp or vibrate due to air currents generated inside or outside the heating chamber, fluctuations in film transport speed, loosening of the grip of the film by the clip unit, and the like. If such vertical displacement of the film occurs, the film may interfere with the passage holes formed in the partition wall, which may affect the quality of the film.

On the other hand, in the heating device 100 of the present embodiment, the pair of first injection parts 41a, 41b and the pair of second injection parts 43a, 43b sandwich the film in the vertical direction, and It is provided at the first passage port 13a. The film is supported in the vertical direction by the gas sprayed onto the film from the pair of first spray parts 41a, 41b and the pair of second spray parts 43a, 43b. This suppresses displacement of the film in the vertical direction inside the first passage port 13a, thereby preventing the film from interfering with the first passage port 13a, thereby suppressing deterioration in film quality.

The heating device 100 also includes a pair of first injection parts 41a, 41b and a pair of second injection parts 43a, 43b as a pair of support parts. The pair of first jetting parts 41a, 41b and the pair of second jetting parts 43a, 43b are arranged side by side in the film transport direction. The temperature of the gas injected by the relatively upstream first injection parts 41a, 41b is approximately the same as the temperature of the preheating chamber 21, and the temperature of the gas injected by the relatively downstream second injection parts 43a, 43b. is approximately the same as the temperature of the stretching chamber 22. Therefore, even if some of the gas injected from the first injection parts 41a, 41b hits the film and changes direction and tries to flow toward the stretching chamber 22, the gas injected from the second injection parts 43a, 43b will Flow into the stretching chamber 22 is prevented. Similarly, the gas injected from the first injection parts 41a, 41b prevents the gas injected from the second injection parts 43a, 43b from flowing into the preheating chamber 21. Therefore, temperature changes in the preheating chamber 21 and the stretching chamber 22 can be suppressed by the gases injected by the first injection parts 41a, 41b and the second injection parts 43a, 43b.

The effects of this embodiment will be explained below.

The heating device 100 that heats the film being conveyed has heating chambers (preheating chamber 21, stretching chamber 22, heat treatment chamber 23) divided therein, and a passage opening (entrance) that opens into the heating chamber and allows the film to pass through. 11a, a first passage port 13a, a second passage port 14a, and an exit 12a), and a support mechanism 40 that supports the transported film. It has a pair of support parts (first injection parts 41a, 41b, second injection parts 43a, 43b) which are provided around the periphery and are opposed to each other across the film in the vertical direction of the film and spray gas onto the film.

In this configuration, the pair of support parts spray gas to support the film and suppress displacement of the film in the vertical direction. Since the pair of support parts are provided on the inner periphery of the passage opening, interference between the film and the inner wall of the passage opening can be effectively prevented.

In addition, in the heating device 100, the support mechanism 40 includes a pair of first support parts (first injection parts 41a, 41b) and a pair of second support parts (second injection parts 42a, 42b) as a pair of support parts. However, the pair of first supporting parts are provided upstream of the pair of second supporting parts in the film transport direction.

Furthermore, in the heating device 100, the temperature of the gas sprayed by the pair of first supports is different from the temperature of the gas sprayed by the pair of second supports.

In these configurations, the gas injected from one of the first support part and the second support part suppresses the gas injected from the other from flowing into or out of the heating chamber through the passage port. Therefore, temperature changes in the heating chamber can be suppressed.

The heating device 100 further includes a heating section (heating nozzles 31a, 31b) that sprays gas onto the film to heat the film.

Furthermore, in the heating device 100, the flow rate of gas sprayed from the support section onto the film is smaller than the flow rate of gas sprayed onto the film from the heating section.

According to this configuration, it is possible to suppress the temperature of the heating chamber from changing due to the gas injected from the support part.

Furthermore, in the heating device 100, the distance between the film and the supporting section in the direction perpendicular to the film is shorter than the distance between the film and the heating section.

With this configuration, the film can be supported even if the amount of gas jetted by the support section is small, and displacement of the film can be suppressed.

In the heating device 100, the angle at which the gas is sprayed from the support section to the film is perpendicular to the film.

Although the embodiments of the present invention have been described above, the above embodiments merely show a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments. do not have.

In the embodiment described above, a support portion is provided at each of the passage ports, namely, the inlet 11a, the first passage port 13a, the second passage port 14a, and the outlet 12a. On the other hand, if the displacement of the film in the vertical direction is small, the support mechanisms 40 may not be provided at all the passage ports. The heating device 100 may have a configuration in which at least one of the passage ports is provided with a support portion.

Moreover, in the embodiment described above, the heating device 100 has a plurality of heating chambers. On the other hand, the heating device 100 may have a single heating chamber. Even in this case, displacement of the film can be suppressed by providing a support section at at least one of the inlet 11a and the outlet 12a.

Moreover, in the embodiment described above, the heating device 100 includes a pair of first injection parts 41a, 41b (first support part) and a pair of second injection parts 43a, 43b (second support part) as support parts. The pair of first injection parts 41a, 41b and the pair of second injection parts 43a, 43b have different temperatures of the gases to be injected. On the other hand, the heating device 100 is not limited to having a pair or a plurality of support parts. The heating device 100 may have one support section above the film transport surface P and one support section below the film transport surface P.

100 Heating device 10 Main body 11a Inlet (passing port)
12a Exit (passing port)
13a 1st passing port (passing port)
14a 2nd passing port (passing port)
21 Preheating chamber (heating chamber)
22 Stretching chamber (heating chamber)
23 Heat treatment chamber (heating chamber)
31a Heating nozzle (heating part)
31b Heating nozzle (heating part)
40 Support mechanism 41a First injection part (support part, first support part)
41b First injection part (support part, first support part)
42a Second injection part (support part, second support part)
42b Second injection part (support part, second support part)

Claims (7)

A heating device that heats a film being conveyed,
a main body portion having a heating chamber partitioned therein and a passage opening opening into the heating chamber and allowing the film to pass therethrough;
A support mechanism that supports the film being transported,
The support mechanism includes a pair of support parts provided on the inner periphery of the passage port and facing each other across the film in a direction perpendicular to the film and spraying gas onto the film.
heating device. The heating device according to claim 1,
The support mechanism has a pair of first support parts and a pair of second support parts as the pair of support parts,
The pair of first supporting parts are provided upstream of the pair of second supporting parts in the transport direction of the film,
heating device. The heating device according to claim 2,
The temperature of the gas sprayed by the pair of first supports is different from the temperature of the gas sprayed by the pair of second supports,
heating device. The heating device according to any one of claims 1 to 3,
further comprising a heating unit that sprays gas onto the film to heat the film;
heating device. The heating device according to claim 4,
The flow rate of the gas sprayed from the supporting part to the film is smaller than the flow rate of the gas sprayed from the heating part to the film.
heating device. The heating device according to claim 4 or 5,
The distance between the film and the supporting part in the vertical direction of the film is shorter than the distance between the film and the heating part.
heating device. The heating device according to any one of claims 1 to 6,
The spraying angle of the gas of the support part to the film is perpendicular to the film;
heating device.

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