JP2023130162A - Heater - Google Patents

Abstract

To prevent occurrence of temperature variations in a heating chamber.SOLUTION: A heater 100 includes: a body 10 that has an internally defined heating chamber and also has a passage port within the heating chamber to allow the passage of a film; and an airflow controller 40 that controls airflow to pass through the passage port. The airflow controller 40 includes a suction part 41 provided in the passage port for gas intake.SELECTED DRAWING: Figure 3

Description

The present invention relates to a heating device.

As a device for suppressing the inflow of gas into the heating chamber from the outside, Patent Document 1 describes a tenter oven that has an inlet for carrying in a film and an outlet for carrying out the film, and a tenter oven that is provided on the upstream side of the inlet in the film running direction. A box-like airflow control device is disclosed. This airflow control device includes a pair of spray nozzles for spraying air onto the film, which face each other across a film passing surface, and an exhaust mechanism that discharges the air inside the box-shaped body. It is equipped with

International Publication No. 2017/115654

In the airflow control device described in Patent Document 1, air from outside the device is blocked by an air curtain formed by air jetted from a jetting nozzle, and the direction of the flow is changed, so that air flows into the tenter oven. This is intended to prevent temperature unevenness within the oven that occurs due to this.

In such a device, in order to further suppress the inflow of air into the tenter oven, the spray nozzle should be placed closer to the entrance of the heating chamber, and the flow rate or speed of the air sprayed by the spray nozzle should be adjusted. One possible method is to increase the

However, if the spray nozzle is brought closer to the entrance of the heating chamber or the flow rate or speed of the sprayed air is increased, the air sprayed by the spray nozzle itself may flow into the heating chamber. Therefore, in the device described in Patent Document 1, temperature unevenness may occur in the heating chamber due to the blown air, and it is difficult to sufficiently improve the effect of suppressing temperature unevenness in the heating chamber. Ta.

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 can sufficiently suppress the occurrence of temperature unevenness within a heating chamber.

A heating device that heats a film being conveyed, the main body having a heating chamber partitioned therein and a passage opening that opens into the heating chamber and allows the film to pass through, and an airflow passing through the passage opening. an airflow control device for controlling the airflow control device, and the airflow control device has a suction section that is provided at the passage port and sucks gas.

According to these aspects, the gas that is about to flow into or out of the heating chamber through the passage port is sucked by the suction section. As a result, the generation of air currents flowing into or out of the heating chamber is suppressed, and the occurrence of temperature unevenness in the heating chamber is suppressed. In addition, since the movement of gas flowing into or out of the heating chamber is suppressed by suction rather than jetting, it is also possible to prevent the situation where the jetted gas itself flows into or out of the heating chamber, causing temperature unevenness. . Therefore, the occurrence of temperature unevenness within the heating chamber can be sufficiently suppressed.

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. FIG. 3 is an enlarged sectional view showing an airflow control mechanism of a heating device according to an embodiment of the present invention. 4 is an enlarged view showing the configuration of the suction part of the heating device according to the embodiment of the present invention, in which (a) is a view of the suction part seen from the direction of arrow A in FIG. 3, and (b) is a diagram of the suction part seen from the direction of arrow B in FIG. 3. It is a figure of the suction part seen from the direction.

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 simultaneous biaxial stretching device that simultaneously stretches in the "MD direction") and the transverse direction perpendicular to the MD direction (hereinafter also referred to as 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 and 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.

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, reference rail 8, pitch setting rail 9, and 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. . Note that in FIG. 3, which will be described later, illustrations of the film, reference rail 8, clip unit 3, etc. are omitted.

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".

The heating device 100 further includes a temperature control device 30 that controls the temperature of the film being conveyed, and an airflow control device 40 that controls the airflow within the main body portion 10.

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, between the outside of the main body section 10 and the preheating chamber 21, between the preheating chamber 21 and the stretching chamber 22, between the stretching chamber 22 and the heat treatment chamber 23, and between the heat treatment chamber 23 and the outside of the main body section 10, Four airflow control devices 40 are provided, each controlling the airflow between the two. Thereby, the airflow between the outside and the inside of the main body part 10 through the inlet 11a and the outlet 12a, and the airflow between the heating chambers inside the main body part 10 are controlled. Each configuration of the airflow control device 40 is basically the same, so below, the airflow control device 40 that controls the airflow between the preheating chamber 21 and the stretching chamber 22 will be explained as an example, and other airflow control devices will be explained. Regarding the device 40, specific description and reference numbers will be omitted as appropriate. In the following, the blower 32 that supplies gas to the heating nozzles 31a and 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 and 31b of the stretching chamber 22 will be referred to as a "second blower". 32b".

As shown in FIG. 3, the airflow control device 40 includes a suction section 41 provided in the first partition wall 13 for sucking gas, and a suction section 41 provided in the preheating chamber 21 for injecting gas to brake the airflow to the suction section 41. A pair of first braking nozzles 42a, 42b as a first injection part, and a pair of second braking nozzles 43a as a second injection part provided in the stretching chamber 22 and braking the airflow to the suction part 41 by injecting gas. , 43b, and a blower 45 as a power source for sucking gas through the suction part 41. In addition, in the other airflow control device 40, the suction part 41 is provided in either the inlet wall 11, the outlet wall 12, and the 2nd partition wall 14, respectively. Moreover, although the blower 45 is commonly used in each airflow control device 40, it is not limited thereto.

The suction section 41 includes a pair of first suction sections 50a and 50b provided with an exhaust port E1 opened in the first partition wall 13, and a pair of second suction sections provided with an exhaust port E2 opened in the first partition wall 13. It has 55a and 55b.

The pair of first suction parts 50a, 50b and the pair of second suction parts 55a, 55b are provided near the first passage port 13a of the first partition wall 13. The exhaust ports E1 of the pair of first suction parts 50a and 50b open on the side surface of the first partition wall 13 facing the preheating chamber 21. The exhaust ports E2 of the pair of second suction parts 55a and 55b open on the side surface of the first partition wall 13 facing the stretching chamber 22. In this way, the pair of first suction parts 50a, 50b are provided upstream of the pair of second suction parts 55a, 55b in the film transport direction.

A suction passage 46 is formed inside the first partition wall 13 to communicate the exhaust ports E1 and E2 with the blower 45. A pressure equalizing plate 48a is provided between the first suction section 50a and the second suction section 55a and the blower 45 to adjust the pressure balance by rectifying the flow of the sucked gas using a through hole that allows gas to pass through. Similarly, a pressure equalizing plate 48b is provided between the first suction section 50b and the second suction section 55b and the blower 45.

In the first suction parts 50a and 50b, gas that is mainly trying to pass through the first passage port 13a from the preheating chamber 21 toward the stretching chamber 22 is removed through the exhaust port E1, which is opened and provided so as to face the preheating chamber 21. It gets sucked in. Similarly, in the second suction parts 55a and 55b, the air mainly moves from the preheating chamber 21 through the first passage port 13a and toward the stretching chamber 22 through an exhaust port E2 that is opened and provided so as to face the stretching chamber 22. Aspirate the gas.

The pair of first suction units 50a and 50b each have two slide plates 51 and 53 stacked in the film transport direction. The two stacked slide plates 51 and 53 are relatively slidable on their contact surfaces. A plurality of through holes 52 are formed in one slide plate 51, and a plurality of through holes 54 are formed in the other slide plate 53.

4(a) is an enlarged view showing the first suction part 50a seen from the direction of arrow A in FIG. 3, and FIG. 4(b) is an enlarged view showing the second suction part 55a seen from the direction of arrow B in FIG. It is a diagram. As shown in FIG. 4(a), the through hole 52 formed in one slide plate 51 is at least partially connected to the through hole 54 formed in the other slide plate 53 in the thickness direction (film conveyance direction). They are arranged so that they overlap. An exhaust port E1 is formed by a portion where the through holes 52 and 54 of the two slide plates 51 and 53 overlap. The through holes 52 and 54 are formed, for example, in the shape of a long hole. By relatively sliding the two slide plates 51 and 53 in the left-right direction in FIG. 4, the area where the through-holes 52 and 54 overlap can be changed. This makes it possible to adjust the amount of gas sucked through the exhaust port E1 by changing the opening area of the exhaust port E1.

The configuration of the second suction parts 55a, 55b is similar to the configuration of the first suction parts 50a, 50b. The pair of second suction parts 55a and 55b have two slide plates 56 and 58. A plurality of through holes 57 are formed in the slide plate 56, and a plurality of through holes 59 are formed in the slide plate 58. As shown in FIG. 4(b), an exhaust port E2 is formed by the through hole 57 and the through hole 59 that overlap in the film transport direction.

Hatching in FIGS. 4A and 4B indicates the opening area of the exhaust port E1 of the first suction section 50a and the opening area of the exhaust port E2 of the second suction section 55a. In FIG. 4A, the through hole 52 and the through hole 54 in the first suction part 50a overlap so as to substantially match. On the other hand, in the second suction part 55a shown in FIG. 4(b), the through hole 57 and the through hole 59 only partially overlap. In this way, the opening area of the exhaust port E2 of the second suction section 55a, 55b is set to be smaller than the opening area of the exhaust port E1 of the first suction section 50a, 50b. Thereby, the amount of gas suctioned by the second suction parts 55a, 55b becomes smaller than the amount of gas suctioned by the first suction parts 50a, 50b.

It is desirable that the exhaust ports E1 of the first suction section 50a and the exhaust ports E2 of the second suction section 55a are distributed over the entire area of the first passage port 13a in the width direction of the film. Thereby, the airflow that is about to pass through the first passage port 13a can be sucked by the first suction section 50a and the second suction section 55a in the entire width direction of the film.

Gas is supplied to the first brake nozzle 42 from the first blower 32a as a gas supply source. Gas is supplied to the second brake nozzle 43 from the second blower 32b as a gas supply source. In this way, the gas supply source of the first brake nozzle 42 is common to the gas supply source of the temperature control device 30 of the preheating chamber 21 in which the first brake nozzle 42 is provided. The gas supply source of the second brake nozzle 43 is common to the gas supply source of the temperature control device 30 of the stretching chamber 22 in which the second brake nozzle 43 is provided. Further, the gas supply source for the first brake nozzle provided upstream of the inlet wall 11 and the second brake nozzle provided downstream of the outlet wall 12 is a blower 44 (see FIG. 2) is used. In addition, the gas supply source may be the 1st brake nozzle 42, the 2nd brake nozzle 43 (airflow control device 40), and the temperature control device 30, and may be separate.

As shown in FIG. 3, the pair of first braking nozzles 42a and 42b are provided facing each other in the vertical direction of the film transport surface P with the film transport surface P in between. The gas in the preheating chamber 21 is guided by the blower 42c to the pair of first brake nozzles 42a, 42b, and the gas is sprayed toward the film through the pair of first brake nozzles 42a, 42b.

Similarly, the pair of second brake nozzles 43a and 43b are provided facing each other in the vertical direction of the film transport surface P with the film transport surface P in between. The gas in the stretching chamber 22 is guided by the blower 43c to the pair of second brake nozzles 43a, 43b, and the gas is sprayed toward the film through the pair of second brake nozzles 43a, 43b.

In this way, since the gas injected by the pair of first brake nozzles 42a, 42b and the pair of second brake nozzles 43a, 43b is the gas in the heating chamber in which they are installed, the film and heating chamber ( Temperature changes within the preheating chamber 21 and the stretching chamber 22) are prevented.

The gas injection angle θ1 of the pair of first braking nozzles 42a and 42b provided upstream of the suction section 41 in the film transport direction is set so that the gas is sprayed upstream in the film transport direction. It is inclined with respect to each of the vertical direction and the parallel direction (film transport direction). The gas injection angle θ2 of the pair of second braking nozzles 43a and 43b provided downstream of the suction section 41 in the film transport direction is set so that the gas is sprayed upstream in the film transport direction. is inclined with respect to each of the vertical and parallel directions.

Specifically, the reference line is a line perpendicular to the film transport surface P, and the acute angle ( In other words, when the injection angle θ1 is the inferior angle, the injection angle θ1 is greater than 0° and smaller than 90° (0°<θ1<90°). Preferably, the injection angle θ1 of the first brake nozzles 42a, 42b is greater than 0° and less than or equal to 45° (0°<θ1≦45°).

Similarly, the injection angle θ2 of the second brake nozzles 43a, 43b is greater than 0° and smaller than 90° (0°<θ2<90°). Preferably, the injection angle θ2 of the second brake nozzles 43a, 43b is greater than 0° and less than or equal to 45° (0°<θ2≦45°).

Note that the injection angles of the first brake nozzle 42a and the first brake nozzle 42b are the same at θ1. The injection angles of the second brake nozzle 43a and the second brake nozzle 43b are the same at θ2.

Furthermore, the amount of gas per hour injected by the pair of first braking nozzles 42a, 42b is set to be larger than the amount of gas injected by the pair of second braking nozzles 43a, 43b, but they are not the same. It's okay.

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

Generally, in a heating device, airflow may occur between heating chambers through passage ports in a partition wall due to a difference in temperature or pressure between adjacent heating chambers. When such airflow occurs, a temperature change occurs within the heating chamber, resulting in a change in temperature distribution (temperature unevenness) within the heating chamber. If temperature unevenness occurs, there is a risk that the quality of the film will deteriorate, so it is desirable to prevent airflow between the heating chambers.

One possible method for preventing airflow between the heating chambers is to form an air curtain with gas injected toward the film and block the airflow with the air curtain. In order to enhance the airflow blocking effect, methods such as providing an air curtain near the passage ports between the heating chambers and increasing the flow rate or speed of the gas to be injected can be considered.

However, if an air curtain is installed near the passage between the heating chambers, or if the flow rate or speed of the injected gas is increased, the gas itself injected to form the air curtain becomes an airflow moving between the heating chambers. There is a possibility that it may flow into the heating chamber. Therefore, there is a limit to the ability to block airflow by an air curtain formed by injecting gas.

On the other hand, in the heating device 100 of the present embodiment, the suction section 41 that sucks gas is provided near the first passage port 13a of the first partition wall 13, so that it is connected to the preheating chamber 21 through the first passage port 13a. Gas attempting to move between the chamber 22 and the chamber 22 is sucked by the suction section 41. This suppresses the generation of airflow between the heating chambers, and suppresses the occurrence of temperature unevenness between the preheating chamber 21 and the stretching chamber 22. Furthermore, since the movement of gas between the preheating chamber 21 and the stretching chamber 22 is suppressed by suction rather than gas injection, there is a possibility that the injected gas may flow into the preheating chamber 21 or the stretching chamber 22, causing temperature unevenness. Prevented. Therefore, the occurrence of temperature unevenness within the preheating chamber 21 and the stretching chamber 22 can be sufficiently suppressed.

In addition, since the heating device 100 is usually affected by film transport, the air flow from the upstream side to the downstream side in the film transport direction is stronger than the air flow from the downstream side to the upstream side in the film transport direction. Likely to happen. On the other hand, in the heating device 100, the first brake nozzles 42a and 42b located upstream of the suction section 41 in the film transport direction inject gas toward the upstream, and the second brake nozzles located downstream of the suction section 41 inject gas toward the upstream side. 43a and 43b also inject gas toward the upstream. Therefore, the airflow trying to move from the preheating chamber 21 to the stretching chamber 22 and passing through the first passage port 13a together with the film is controlled by the gas injected from the first brake nozzles 42a and 42b from the first passage port 13a. Pushed back away or slowed down. Similarly, the airflow that attempts to move from the preheating chamber 21 to the stretching chamber 22 by passing through the first passage port 13a and heading into the stretching chamber 22 is moved toward the preheating chamber 21 by the gas injected from the second brake nozzles 43a and 43b. The object may be pushed back towards the object or its speed may be reduced. As a result, the flow rate and speed of the airflow passing through the first passage port 13a and heading into the stretching chamber 22 are reduced, so that the airflow that attempts to move from the preheating chamber 21 to the stretching chamber 22 as the film is transported is sucked. The portion 41 allows more reliable suction.

Further, the suction section 41 has first suction sections 50a, 50b and second suction sections 55a, 55b, and the amount of gas suctioned by the first suction sections 50a, 50b on the relatively upstream side is the same as that of the second suction section. The amount is set to be larger than the gas suction of 55a and 55b. By relatively increasing the suction amount of the first suction parts 50a and 50b, it is possible to effectively suction airflow that tends to occur frequently and has a high flow rate from the upstream side to the downstream side.

Similarly, by setting the amount of gas ejected from the first brake nozzles 42a, 42b on the upstream side of the suction section 41 to be larger than that of the second brake nozzles 43a, 43b on the downstream side, Airflow directed toward the downstream side can be effectively sucked.

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) partitioned inside, 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 outlet 12a), and an airflow control device 40 that controls the airflow passing through the passage ports. It has a suction part 41 that is provided at the passage port and sucks gas.

In this configuration, gas that is about to flow into or out of the heating chamber through the passage port is sucked by the suction section 41. As a result, the generation of airflow flowing into or out of the heating chamber is suppressed, and the occurrence of temperature unevenness in the heating chamber is suppressed. Furthermore, since the movement of the gas flowing into or out of the heating chamber is suppressed by suction rather than jetting the gas, a situation where the jetted gas itself flows into or out of the heating chamber and causes temperature unevenness is also prevented. Therefore, the occurrence of temperature unevenness within the heating chamber can be sufficiently suppressed.

The heating device 100 also includes first braking nozzles 42a and 42b that are provided upstream of the suction section 41 in the film transport direction and spray gas toward the film, and It further includes second braking nozzles 43a and 43b that are provided on the downstream side of the film and spray gas toward the film, and the gas injection angle θ1 of the first braking nozzles 42a and 42b relative to the film is set at The gas injection angle θ2 of the second braking nozzles 43a, 43b relative to the film is tilted from the vertical direction of the film so as to spray gas toward Tilt from the vertical direction.

In this configuration, the airflow trying to move into the heating chamber from the upstream side through the passage port is pushed back or has a speed reduced by the gas injected by the first brake nozzles 42a, 42b and the second brake nozzles 43a, 43b. Slowed down. As a result, the flow rate and speed of the airflow are reduced, so that the suction section 41 can more reliably suction the airflow that occurs from the upstream side to the downstream side as the film is conveyed. Therefore, the occurrence of temperature unevenness within the heating chamber can be further suppressed.

Furthermore, in the heating device 100, the amount of gas injected by the first brake nozzles 42a, 42 is set to be the same as or greater than the amount of gas injected by the second brake nozzles 43a, 43b.

In this configuration, by making the injection amount of the first braking nozzles 42a, 42 at least equal to or greater than the injection amount of the second braking nozzles 43a, 43b, the airflow from the upstream side to the downstream side that occurs as the film is conveyed can be reduced. Can be braked effectively. Therefore, the airflow directed from the upstream side to the downstream side can be effectively sucked by the suction section 41, and the occurrence of temperature unevenness in the heating chamber can be further suppressed.

Furthermore, in the heating device 100, the suction section 41 has first suction sections 50a, 50b and second suction sections 55a, 55b that suck gas, respectively, and the first suction sections 50a, 50b have a second suction section 55a. , 55b in the film transport direction, and the amount of gas suctioned by the first suction parts 50a, 50b is set to be the same as or larger than the amount of gas suctioned by the second suction parts 55a, 55b. be done.

In this configuration, by setting the suction amount of the first suction parts 50a, 50b to at least more than the second suction parts 55a, 55b, the airflow generated from the upstream side to the downstream side that occurs as the film is conveyed can be effectively reduced. Can be inhaled. Therefore, the occurrence of temperature unevenness within the heating chamber can be further suppressed.

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, the suction section 41 is provided in each of the inlet wall 11, the outlet wall 12, the first partition wall 13, and the second partition wall 14, which are partitions. On the other hand, if there is a low possibility that the temperature inside the heating chamber will change due to airflow, or if the temperature change does not affect the quality of the film, the suction part 41 is not provided in all the partitions. It's okay. The heating device 100 may have any configuration as long as the suction section 41 is provided in at least one of the partition sections.

Further, in the embodiment described above, the exhaust ports E1 and E2 of the suction section 41 are located near the passage port and open on the side surface of the partition section facing the heating chamber. On the other hand, a configuration may be adopted in which the suction portion 41 constitutes a part of the inner wall of the passage port, and the exhaust ports E1 and E2 open into the passage port. Further, both the exhaust ports E1 and E2 that open on the side surface of the partition and the exhaust ports E1 and E2 that open on the inner wall of the passage port may be provided.

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, temperature changes in the heating chamber can be suppressed by providing the suction section 41 at at least one of the inlet 11a and the outlet 12a.

Furthermore, in the embodiment described above, the suction section 41 includes first suction sections 50a, 50b provided relatively upstream in the conveyance direction, and second suction sections 55a, 55b provided relatively downstream. . The amount of gas suctioned by the first suction parts 50a, 50b is larger than the amount of gas suctioned by the second suction parts 55a, 55b. On the other hand, the configuration of the suction section 41 is not limited to the above configuration. The suction amount of the first suction parts 50a, 50b may be smaller than the suction amount of the second suction parts 55a, 55b. Further, the first suction parts 50a, 50b and the second suction parts 55a, 55b may be set to have the same suction amount.

Further, in the above embodiment, the second suction parts 55a, 55b adjust the opening area of the exhaust port E2 by sliding one slide plate 56 with respect to the other slide plate 58, so that the suction amount can be adjusted. This is the configuration that will be used. On the other hand, the configuration for adjusting the suction amount is not limited to the above configuration, and may be other configurations. For example, an exhaust line is divided into an exhaust line through which the gas sucked from the first suction parts 50a, 50b passes, and an exhaust line through which the gas suctioned from the second suction parts 55a, 55b passes, and the flow rate of the gas passing through each exhaust line. A valve or an air volume adjustment damper may be provided to control the air flow. For example, a valve or an air volume adjusting damper can be provided between the first suction parts 50a, 50b and the pressure equalizing plates 58a, 58b, and between the second suction parts 55a, 55b and the pressure equalizing plates 58a, 58b. Also with such a configuration, the suction amount of the first suction parts 50a, 50b can be set to be larger than the suction amount of the second suction parts 55a, 55b.

In the above embodiment, the first brake nozzles 42a, 42b and the second brake nozzles 43a, 43b of the airflow control device 40 are arranged perpendicular to the film transport surface P so as to inject gas toward the upstream side in the transport direction, respectively. It is provided so as to be inclined with respect to the direction. On the other hand, the second brake nozzles 43a and 43b on the downstream side may be provided so as to be inclined with respect to the perpendicular direction of the film transport surface P so as to inject gas toward the downstream in the transport direction. .

Further, in the above embodiment, the first brake nozzles 42a, 42b and the second brake nozzles 43a, 43b of the airflow control device 40 have gas injection angles θ1, θ2 that are inclined with respect to the vertical direction of the film transport surface P. It is set up like this. On the other hand, the first brake nozzles 42a, 42b and the second brake nozzles 43a, 43b may be provided such that the gas injection angles θ1, θ2 are perpendicular to the film transport surface P. Furthermore, in the heating device 100, the first brake nozzles 42a, 42b and the second brake nozzles 43a, 43b are not essential components.

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)
40 Airflow control device 41 Suction part 42a First braking nozzle (first injection part)
42b First brake nozzle (first injection part)
43a Second brake nozzle (second injection part)
43b Second brake nozzle (second injection part)
50a First suction part 50b First suction part 55a Second suction part 55b Second suction part

Claims (4)

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;
an airflow control device that controls airflow passing through the passage port,
The airflow control device includes a suction unit that is provided in the partition where the passage port is formed and that sucks gas.
heating device. The heating device according to claim 1,
a first injection section that is provided upstream of the suction section in the transport direction of the film and sprays gas toward the film;
further comprising a second injection section that is provided downstream in the transport direction of the film with respect to the suction section and sprays gas toward the film,
The injection angle of the gas of the first injection unit with respect to the film is inclined from the perpendicular direction of the film so as to spray the gas toward the upstream side in the conveying direction of the film,
The injection angle of the gas of the second injection unit with respect to the film is inclined from the perpendicular direction of the film so as to spray the gas toward the upstream side in the conveyance direction of the film.
heating device. The heating device according to claim 2,
The amount of gas injected by the first injector is set to be the same as or greater than the amount of gas injected by the second injector,
heating device. The heating device according to any one of claims 1 to 3,
The suction section has a first suction section and a second suction section that suck gas, respectively,
The first suction section is provided upstream of the second suction section in the transport direction of the film,
The amount of gas suctioned by the first suction part is set to be the same as or greater than the amount of gas suctioned by the second suction part,
heating device.

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