Stretching equipment and thin film manufacturing equipment

Abstract

To provide a stretching unit and a thin-film manufacturing device, which are excellent in energy efficiency and can be maintained at low cost.SOLUTION: There is provided a stretching unit for stretching a thin-film, in particular a transverse direction orienting device and / or simultaneous stretching unit, including an oven and a heat recovery system (28). The heat recovery system (28) includes a heat exchanger (34) with an exhaust air duct (46) for exhaust air from the oven, a supply air duct (44) for supply air to the oven, a plurality of heat conductors (48), a plurality of heat collectors (50), and a condensate collector (52). The exhaust air duct (46) is open towards the condensate collector (52), the plurality of heat collectors (50) are located in the exhaust air duct (46) with an interstice (68) between the plurality of adjacent heat collectors (50), the plurality of heat conductors (48) are connected thermally to the heat collectors (50), and the interstices (68) are open towards the condensate collector (50). There is also provided a thin-film manufacturing device.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] This invention relates to a stretching apparatus and a thin film manufacturing apparatus. [Background technology]

[0002] Thin film manufacturing equipment is known to typically include at least one stretching device. Because the heating furnace inside the stretching device requires extremely high temperatures, the production of resin (plastic) thin films using thin film manufacturing equipment requires a high degree of energy concentration.

[0003] Furthermore, fresh air must be continuously supplied to the heating furnace, while exhaust gases are discharged from the furnace to replace the supplied air, thereby reducing contamination inside the furnace. Various different substances, especially major hydrocarbons, are leached from the thin film passing through the heating furnace and become pollutants. In addition, high heating energy is required for ventilation in order to heat the fresh air supplied to the heating furnace to an appropriate temperature.

[0004] While it is well known that thin-film manufacturing equipment uses heat exchangers for heat recovery, when high-temperature air is cooled within the heat exchanger, condensed substances contained in the cooling air from the heating furnace condense on the exhaust side of the heat exchanger surface. Therefore, if the heat exchanger is not kept clean, its heat exchange efficiency deteriorates, but cleaning the heat exchanger is a difficult task. [Overview of the project] [Problems that the invention aims to solve]

[0005] The present invention aims to provide a stretching device and a thin film manufacturing device that are particularly energy-efficient and can be maintained at low cost. [Means for solving the problem]

[0006] The object of the present invention is achieved by a thin film stretching apparatus comprising a heating furnace and a heat recovery apparatus, particularly a lateral orientation apparatus and / or simultaneous stretching apparatus for stretching a thin film. The heat recovery apparatus is provided with an exhaust pipe for discharging exhaust gas from the heating furnace, an air supply pipe for supplying air to the heating furnace, a condensate collector and a heat exchanger including a plurality of heat conductors and a plurality of heat collectors. The air supply pipe and the exhaust pipe are separated from each other by a partition wall, and the heat conductors provided in the exhaust pipe are arranged to extend from the exhaust pipe into the air supply pipe through the partition wall, and the exhaust pipe is open to the condensate collector. The heat collectors are arranged in the exhaust pipe with gaps formed between adjacent heat collectors, the heat conductors are connected to the heat collectors in a heat-transferable manner, and the gaps between the heat collectors are open to the condensate collector.

[0007] The heat collectors enable the heat exchanger to achieve high heat exchange efficiency. Condensants that form within the heat exchanger are reliably transported through a condensate collector, while the gaps between the heat collectors are opened to the condensate collector. Therefore, a permanently high efficiency level is maintained without the need for purification and maintenance. For example, each heat collector is connected to at least one, multiple, or all heat conductors. The supply air is particularly fresh air from the environment of the extension unit.

[0008] In this embodiment of the present invention, multiple radiators act as heat collectors installed in the air supply pipe. Furthermore, the exhaust heat pipe in this embodiment forms an exhaust flow, and the condensate collector is located outside the flow path. In this way, condensate generated in the heat exchanger can be removed along with the airflow of the exhaust flow.

[0009] A condensate collector is positioned below the exhaust pipe, particularly in at least a portion of the area below the exhaust flow, to effectively remove condensate from the gaps between the solar collectors. The term "below" within the scope of the disclosure of this invention should be understood to mean the corresponding assembly location where the heat recovery device is installed. In particular, the term "below" means directly vertically downward and does not additionally imply horizontal displacement.

[0010] The exhaust pipe according to an embodiment of the present invention comprises a base having a condensate outlet that constitutes part of at least one condensate collector, and can reliably remove condensate collected from the exhaust pipe from the condensate outlet. For example, the base is designed as a condensate level or groove.

[0011] The condensate collector of the embodiment of the present invention reliably collects and disposes of condensates, and allows the receiving tray free of condensates to be removed from the condensate collector.

[0012] The heat recovery device includes a condensate discharge pipe that is fluidly connected to a condensate collector via a curved pipe. The heat collector is formed in a plate shape, and the heat transfer range of the heat conductor is extended through the heat collector to which it is connected, thereby further improving the efficiency of the heat exchanger.

[0013] Each heat conductor is connected at a right angle via at least one, multiple, or all heat collectors. In embodiments of the present invention, the multiple heat collectors are arranged parallel to each other and / or parallel to the partition wall to reduce the flow resistance of the exhaust gas flow in the exhaust pipe. To completely and reliably remove condensate from the condensate collector, the heat conductors can be arranged horizontally or at an angle of 0° to 10° with respect to the horizontal, for example, at an angle of 4°, and the cross-section of the heat conductor in the exhaust pipe can be made smaller than the cross-section of the intake pipe.

[0014] In embodiments of the present invention, the gap between the solar collectors is provided with an exhaust flow direction and a condensation flow direction that are parallel to each other, and in particular, the exhaust flow direction and the condensation flow direction may be perpendicular or deflected at an angle of 0° to 10° with respect to the perpendicular. In this way, the removal of condensates from the gap between the solar collectors is supported by the airflow flowing through the gap.

[0015] The direction of condensate flow is, for example, the direction in which condensates formed in the solar collector, excluding the heat conductor, flow unobstructed. The direction of condensate flow is particularly downward. The heat conductor is extended and positioned in a region of the solar collector perpendicular to the airflow direction and / or the direction of condensate flow.

[0016] In an embodiment of the present invention, the gap between heat collectors has an airflow direction and a condensate flow direction that are perpendicular to each other, wherein the airflow direction is a horizontal direction, and the condensate flow direction is vertical or deflected from the vertical by an angle of 0° to 10°. In this way, the amount of condensate transferred to the environment through the airflow is further reduced. Furthermore, the heat conductor can be formed particularly by a heat transfer device such as a heat conductor to increase heat exchange efficiency.

[0017] In an embodiment of the present invention, the heating furnace is provided with an air supply port fluidly connected to an air supply pipe of the heat exchanger and / or the heating furnace is provided with an exhaust port fluidly connected to an exhaust pipe of the heat exchanger, so that a direct and efficient fluid connection circuit between the heat recovery device and the heating furnace is formed. For example, the fluid connection is formed by a pipeline.

[0018] The heat recovery device includes, for example, a heating blower fluidly connected between the air supply pipe of the heat exchanger and the air supply port of the heating furnace, and the temperature of supplied air can be controlled by the heating blower.

[0019] For example, an air supply blower disposed between the air supply pipe of the heat exchanger and / or the heating blower and the air supply port of the heating furnace is provided. For example, an exhaust blower disposed downstream of the exhaust pipe of the heat exchanger is provided.

[0020] The object of the present invention is also achieved by a thin film manufacturing apparatus comprising at least one said stretching device, another stretching device, an extrusion device, a casting and rolling device, a drawing roller device and / or a winding device. The features and advantages described for the stretching device are equally applicable to the thin film manufacturing apparatus, and conversely, the features and advantages of the thin film manufacturing apparatus are equally applicable to the stretching device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings, wherein the accompanying drawings show: [Figure 1] a perspective view of a thin film manufacturing apparatus including at least a stretching device according to an embodiment of the present invention; [Figure 2] an enlarged perspective view of the heat recovery device used in the stretching device of Fig. 1; [Figure 3] Cross-sectional view of a heat exchanger of a stretching apparatus according to a second embodiment of the present invention; [Figure 4] A side view of the heat exchanger shown in Figure 3; [Figure 5] Perspective view of the heat exchanger shown in Figure 3; [Figure 6] This shows an airflow diagram inside the heat exchanger of a heat recovery device according to a third embodiment of the present invention. [Modes for carrying out the invention]

[0022] Figure 1 shows a thin film manufacturing apparatus 10 comprising several different thin film stretching devices and a heat recovery device. The thin film manufacturing apparatus 10 comprises an extruder 12, a casting and rolling device 14, at least one stretching device 15 consisting of, for example, a machine direction orientation device 16 (MDO) or a transverse direction orientation device 18 (TDO), a drawing roller device 20, and a winding device 22.

[0023] The thin films produced by the thin film manufacturing apparatus 10 are, for example, biaxially oriented thin films such as biaxially oriented polypropylene thin films (BOPP), biaxially oriented polypropylene capacitor thin films (BOPP-C), biaxially oriented polyethylene terephthalate thin films (BOPET), biaxially oriented polyamide thin films (BOPA), biaxially oriented polyethylene thin films (BOPE), or biaxially oriented polylactic acid thin films (BOPLA).

[0024] To manufacture a thin resin film, molten resin is extruded from a starting material such as granular material by an extruder 12 to a casting mill 14, and the molten resin fed into the cooling rolls of the casting mill 14 is manufactured into a thin resin film.

[0025] The resin thin film is transported from the casting roll device 14 to the mechanical direction orientation device 16, where the resin thin film is stretched in the mechanical direction to form a stretched thin film.

[0026] In a mechanical orientation machine 16 that includes numerous rollers for heating the thin film to a desired temperature, the thin film is heated and stretched by the numerous rollers.

[0027] The thin film, sandwiched between at least two rollers provided in the mechanical orientation device 16, is stretched in the mechanical direction, i.e., the drawing direction, to form a stretched thin film.

[0028] The resulting thin film is sent from the mechanical stretcher 16 to the transverse orientationr 18, where the thin film is stretched transversely. The transverse orientationr 18 comprises a heating furnace 26 having different regions for processing the thin film along the drawing direction of the thin film manufacturing apparatus 10.

[0029] In the first region, called the preheating region, the thin film is heated, and in the next second region ("stretching region"), the thin film is stretched laterally. As a result, the width of the thin film increases towards the exit of the transport passage, but the thickness of the thin film decreases at the edges of the second region.

[0030] After the stretching process is complete, a third region and subsequent regions (referred to as the "heat treatment region," "reheating region," and / or "annealing region") are provided, where the thin film is exposed to high temperatures to relieve or remove internal stresses. The thin film is then passed through an additional region ("cooling region") to cool in the final region.

[0031] Further regions, called neutral regions, serve to separate the mutual influence between two adjacent regions. For example, a neutral region is an unventilated empty region. The region of the lateral orienter 18 is divided into different regions and / or designed to be of different lengths. For example, a few or short neutral regions can be provided, or neutral regions can be added at other points. Other remaining regions can also be modified.

[0032] After the transverse orientation device 18, the biaxially stretched thin film is conveyed by the drawing roller device 20 and wound onto the winding device 22. Alternatively, for example, in addition to the stretching device 15 or the mechanical orientation device 16 and / or the transverse orientation device 18, a simultaneous stretching device 19 having a heating furnace 26 may be provided in the thin film manufacturing apparatus 10.

[0033] Within the technical scope of the present invention, the stretching apparatus 15 is described herein as a broad concept including a lateral orientation device, a simultaneous stretching device, or a combination thereof. The stretching apparatus 15, or more specifically the heating furnace 26, requires continuous ventilation of contaminated exhaust air to be continuously supplied with air, particularly fresh air, during operation and replaced. To utilize the waste heat from the exhaust air, the stretching apparatus 15 is equipped with a heat recovery device 28.

[0034] Figure 2 shows a thin film stretching apparatus 15 comprising a heating furnace 26 and a heat recovery device 28. Figure 2 is an enlarged perspective view of an example of a plurality of heat recovery devices 28 provided in the stretching apparatus 15. The heat exchanger 34 comprises an air supply pipe 44 that supplies air to the heating furnace 26 through one set of pipes 42, an exhaust pipe 46 that discharges air from the heating furnace 26 through the other set of pipes 42, a plurality of heat collectors 50 arranged in the exhaust pipe 46, a partition wall 54 that separates the exhaust pipe 46 and the air supply pipe 44 within the heat exchanger 34, and a plurality of heat conductors 48 that penetrate the plurality of heat collectors 50 and the partition wall 54 and are arranged in the air supply pipe 44 and the exhaust pipe 46. The exhaust pipe 46 comprises a condensate collector 52 that collects condensate in the exhaust pipe 46, a plurality of heat collectors 50 arranged adjacent to each other within the exhaust pipe 46, and a gap 68 formed between adjacent heat collectors 50 and open to the condensate collector 52. Multiple heat conductors 48 are connected to multiple heat collectors 50 for heat transfer. Each heating furnace 26 is equipped with an air inlet 30 and an exhaust port 32, which are fluidly connected to the heat recovery device 28. The heat recovery device 28 shown in Figure 3 is equipped with a heat exchanger 34 and a condensate collector 52, and the air supply pipe 44 that supplies air to the heating furnace 26 is connected to the heating blower 40 shown in Figure 2, the air supply blower 36, and one of the piping systems 42. The heat recovery device 28 is equipped with a condensate collector 52 for the heat exchanger 34, an exhaust pipe 46 that discharges air from the heating furnace 26, and an exhaust blower 38.

[0035] The heat exchanger 34, which includes a supply pipe 44 and an exhaust pipe 46 that are separated from each other, is connected to the supply port 30 or exhaust port 32 of each heating furnace 26 by the supply pipe 44. The supply pipe 44 of the heat exchanger 34 is open to the heating furnace 26 and the heat recovery device 28. An optional air filter can be installed in the supply pipe 44.

[0036] The air intake pipe 44 of the heat exchanger 34 draws air from the environment surrounding the air intake pipe 44 and supplies it to the heating furnace 26 through the heating fan 40, the air intake fan 36, one of the piping systems 42, and the downstream air intake port 30. Therefore, the air intake port 30, which supplies ambient air from the air intake pipe 44 to the heating furnace 26, is fluidly connected to the air intake pipe 44 of the heat exchanger 34, the heating fan 40 located between the heat exchanger 34 and the air intake fan 36, the air intake fan 36, and one of the piping systems 42. In addition, the heating fan 40 is positioned between the downstream air intake fan 36 and the heat exchanger 34. The air intake pipe 44 and the exhaust pipe 46 within the heat exchanger 34 are separated from each other by a partition wall 54, and multiple heat conductors 48 located within the exhaust pipe 46 extend from the exhaust pipe 46 through the partition wall 54 into the air intake pipe 44. The exhaust pipe 46 is open into the condensate collector 52. Multiple adjacent solar collectors 50 are arranged within the exhaust pipe 46, and the exhaust pipe 46 has gaps 68 formed between the multiple adjacent solar collectors 50. The heat conductor 48 is connected to the solar collectors 50 for heat transfer, and the gaps 68 formed between the solar collectors 50 are open to the condensate collector 52.

[0037] To discharge the air inside the heating furnace 26, the exhaust port 32 of the heating furnace 26, located at one end of the other piping 42, draws in the air inside the heating furnace 26, transports the air through the other piping 42 and the exhaust pipe 46 of the heat exchanger 34, and discharges the transported air around the exhaust fan 38. The exhaust pipe 46 of the heat exchanger 34 is located between the exhaust fan 38 and the exhaust port 32 of the heating furnace 26, and the air is discharged around the exhaust fan 38 located downstream of the exhaust pipe 46 of the heat exchanger 34. The exhaust fan 38 located downstream of the exhaust pipe 46 can transport the exhaust flow from the exhaust pipe 46 of the heat exchanger 34 to the upstream exhaust port 32.

[0038] Figures 3 and 4 are cross-sectional views (perpendicular to each flow direction) and side views of the heat exchanger 34 of the heat recovery device 28. The heat exchanger 34 includes an air supply pipe 44 and an exhaust pipe 46, as well as a partition wall 54, a plurality of heat conductors 48, and a plurality of heat collectors 50.

[0039] In order to clarify the basic structure and working principle of the heat recovery device 28, several heat conductors 48 and several heat collectors 50 are shown in Figures 3 and 4, but it will be understood that more heat conductors 48 and / or heat collectors 50 may be provided.

[0040] Figures 3 and 4 show a heat exchanger 34 arranged in a predetermined assembly position, together with related components that operate using gravity. An air supply pipe 44 and an exhaust pipe 46 of the heat exchanger 34 are arranged directly adjacent to each other. The air supply pipe 44 is separated from the exhaust pipe 46 by a partition wall 54.

[0041] The exhaust pipe 46 is for an exhaust flow S A and forms a flow passage, while the air supply pipe 44 is for a supply air flow S Z and forms a flow passage. The direction of the exhaust flow S A in the exhaust pipe 46 is opposite to the direction of the supply air flow S Z in the air supply pipe 44, and the direction of the exhaust flow S A in the exhaust pipe 46 is parallel to the direction of the supply air flow S Z in the air supply pipe 44.

[0042] In the first embodiment of the present invention, the direction of the exhaust flow S A in the exhaust pipe 46 and the direction of the supply air flow S Z in the air supply pipe 44 are horizontal. A condensate collector 52 is arranged outside the exhaust flow S A and below the exhaust pipe 46, and the exhaust pipe 46 is open to the condensate collector 52. The condensate collector 52 is arranged on the outside, particularly below the flow passage of the exhaust flow S A It may be provided on at least a part of the exhaust pipe (46) or the exhaust flow (S A ).

[0043] At least part or the entire condensate collector 52 is provided on the grooved base 58 of the exhaust pipe 46, so that condensate falls by gravity vertically downward along at least part or the entire exhaust pipe 46, and the condensate can pass through a condensate outlet 56 of the condensate collector 52.

[0044] The condensate collector 52 includes, for example, a receiving tray 60 additionally provided below the condensate outlet 56. A condensate discharge passage 62, shown by a dotted line in Figure 3, is provided in the heat recovery device 28, and the condensate captured by the receiving tray 60 is discharged from, for example, the receiving tray 60, a curved pipe 64, and the condensate discharge passage 62, which are fluidly connected to the condensate collector 52 shown in Figure 3.

[0045] The multiple heat conductors 48 are composed of, for example, multiple heat transfer devices such as multiple heat conductors. Since the multiple heat conductors 48 extend from the exhaust pipe 46 into the intake pipe 44 by penetrating the partition wall 54, the multiple heat conductors 48 are provided as part of both the intake pipe 44 and the exhaust pipe 46.

[0046] The multiple heat conductors 48 are arranged at an angle α = 0° to 10°, for example, 4°, relative to the horizontal H or the horizontal shown in Figure 3. Since the multiple heat conductors 48 in Figure 3 are arranged at an upward inclination relative to the air intake pipe 44, the cross-section of each heat conductor 48 in the exhaust pipe 46 is positioned lower than the cross-section of the same heat conductor 48 in the air intake pipe 44.

[0047] In the illustrated embodiment, the multiple plate-shaped solar collectors 50 are arranged parallel to each other within the exhaust pipe 46 and / or parallel to the partition wall (54). The multiple solar collectors 50 are arranged parallel to each other, penetrating the partition wall 54. The multiple solar collectors 50 are positioned not only vertically V but also in the exhaust flow S A They are positioned at an angle β = between 0° and 10° with respect to the direction or perpendicular V (Figure 3).

[0048] Multiple heat collectors 50 are arranged perpendicular to the heat conductors 48, but the multiple heat collectors 50 are connected to one, multiple, or all of the heat conductors 48. One, multiple, or all of the heat conductors 48 are connected to heat via, for example, one heat collector 50. Similarly, each heat conductor 48 is connected to one, multiple, or all of the heat collectors 50.

[0049] Similar to the solar collector 50, only one of the multiple heating elements 66 provided in the air supply pipe 44 is shown in Figure 3 for clarity. The multiple gaps 68 formed between the multiple adjacent solar collectors 50, which are arranged parallel to each other, are arranged in the same direction as the solar collectors 50.

[0050] Multiple solar collectors 50 are arranged, and multiple gaps 68 are provided for the exhaust flow S A The direction of the exhaust flow, which is opened in a certain direction and flows into the gap 68, is determined by the assigned gap 68. Similarly, multiple gaps 68 are opened downward toward the condensate collector 52.

[0051] The multiple gaps 68 provide a flow direction F for the condensate that forms from the exhaust air in contact with the multiple solar collectors 50. The flow direction F of the condensate is, for example, downward and has a downward falling component mainly due to gravity. The multiple gaps 68 are formed in the vertical direction V or at an angle β with respect to the vertical direction V, similar to the multiple solar collectors 50. In the example in Figure 3, the heat conductor 48 is positioned perpendicular or right to the flow direction F of the condensate.

[0052] In the embodiment shown in Figure 3, the flow direction F of the condensate is the exhaust flow S. A It is perpendicular to the direction. During the operation of the thin film manufacturing apparatus 10, the stretching apparatus 15, and the heat recovery apparatus 28, hot air is transported from the heating furnace 26 through the exhaust pipe 46 to the exhaust port 32 by the exhaust blower 38. For example, hydrocarbons that rapidly condense when the hot air passing through the exhaust pipe 46 cools are included in the exhaust passing through the exhaust pipe 46.

[0053] The warm exhaust is discharged through the exhaust pipe 46 of the heat exchanger 34 into the exhaust flow S A The exhaust flow in the direction of the heat transfer and comes into contact with the heat collector 50 and the heat conductor 48. Therefore, the exhaust flow passing through the exhaust pipe 46 transfers heat to the heat collector 50, which is cooler than the exhaust flow and the heat conductor 48, and thus the exhaust flow passing through the exhaust pipe 46 heats the environment of the stretching device 15 through the exhaust fan 38.

[0054] Therefore, the heat from the exhaust flow is transferred to the air supply pipe 44 through the heat collector 50 and the heat conductor 48. The supply air, especially fresh air, transported by the air supply fan 36 flows through the air supply pipe 44 into the heating furnace 26.

[0055] The airflow in the air intake pipe 44 is heated by contact with the heat conductor 48 and the heating element 66, which are at a higher temperature than the airflow. Therefore, the airflow passing through the heating fan 40 is heated to the temperature required for the heating furnace 26 by the time it flows into the heating furnace 26 through the air intake port 30 and the air intake pipe 44. As described above, the exhaust airflow in the exhaust pipe 46 is cooled by the heat collector 50. Hydrocarbons in the air condensate generated by the cooling of the exhaust airflow by the heat collector 50 condense into a liquid upon contact with the heat collector 50 and the heat conductor 48.

[0056] Except for the lateral heat conductor 48, the condensate flows downward in the flow direction F through the gap 68 between the heat collector 50 and the surrounding area without any obstruction. When the condensate reaches the lower end of the heat collector 50, it is discharged from the heat collector 50 or flows out and is collected by the condensate collector 52, so the condensate is discharged from the condensation path 62.

[0057] Since condensate can be reliably discharged without any residue remaining in the exhaust pipe 46, especially within the gap 68, clogging due to condensate in the heat recovery device 28 does not occur. Furthermore, the heat exchanger 34 has the advantage of having extremely good heat exchange efficiency and does not require additional or complex maintenance equipment. The heat recovery device 28 operates with extremely high efficiency while also having low maintenance costs.

[0058] Figures 5 and 6 show a second embodiment of the heat recovery device 28, the stretching device 15, and the thin film manufacturing device 10. The second embodiment substantially corresponds to the first embodiment, so in the second embodiment, the same reference numerals are used for parts that are the same as in the first embodiment, and only the differing parts will be described. Figure 5 shows a perspective view of the second embodiment of the heat exchanger 34.

[0059] In the second embodiment, the receiving tray 60 of the condensate collector 52 can be removed from below the exhaust pipe 46. In this case, if it is not necessary to provide a dedicated condensation passage 62, the receiving tray 60 can be removed immediately.

[0060] The condensate outlet 56 shown in Figure 5 is provided on the base 58 of the exhaust pipe 46. For example, the condensate outlet 56 is provided on the downstream edge of the base 58 of the exhaust pipe 46, so the exhaust flow S A This transports the condensate that accumulates at the base to the condensate outlet 56. Figure 6 shows a third embodiment of the heat recovery device 28.

[0061] In the third embodiment, the exhaust flow S A or air intake flow S Z The direction is not horizontal, but perpendicular to the collector 50 and the heat conductor 48. Below the collector 50 and the heat conductor 48, the exhaust pipe 46 is positioned horizontally and / or offset from the heat exchanger 34, so the exhaust flow S A and the air supply flow S Z The direction of the arrow is also deflected (as shown by the arrow in Figure 6).

[0062] The condensate collector 52 is connected to the exhaust flow S through which the exhaust pipe 46 is provided. A It is positioned on the lower side. The condensate collector 52 described in the second embodiment of Figure 3 can be used in the third embodiment of Figure 6.

[0063] The structure of the solar collector 50 and heat conductor 48 of the air supply pipe 44 corresponds to the structure of the first embodiment, so the gap 68 is open to the condensate collector 52. In this embodiment, the exhaust flow S A The direction of the flow of the condensate and the direction of the flow of the condensate are parallel to each other within the region of the solar collector 50.

[0064] Exhaust flow S A The direction of the exhaust flow S and the flow direction F of the condensate are perpendicular to V or at the angle β = 0° to 10° with respect to the perpendicular V as shown in the figure. In this embodiment, the exhaust flow S A The direction of the flow and the direction of the condensate flow F are parallel, and the method of removing condensate from the gap 68 is improved.

[0065] In the present invention, different features of various embodiments can be combined with each other, and in particular, the use of the removable receiving rack 60 and condensate discharge pipe 62 and / or the position of the condensate discharge outlet 56 of the base 58 can be changed.

Claims

1. In a thin film stretching apparatus comprising a heating furnace (26) and a heat recovery device (28), The heat recovery device (28) is equipped with a heat exchanger (34), The heat exchanger (34) comprises an air supply pipe (44) that supplies air to the heating furnace (26) through one set of pipes (42), an exhaust pipe (46) that discharges air from the heating furnace (26) through the other set of pipes (42), a plurality of heat collectors (50) arranged inside the exhaust pipe (46), a partition wall (54) that separates the exhaust pipe (46) and the air supply pipe (44) within the heat exchanger (34), and a plurality of heat conductors (48) that penetrate the plurality of heat collectors (50) and the partition wall (54) and are arranged inside the air supply pipe (44) and the exhaust pipe (46). The exhaust pipe (46) comprises a condensate collector (52) for collecting condensates inside the exhaust pipe (46), a plurality of solar collectors (50) arranged adjacent to each other inside the exhaust pipe (46), and a gap (68) formed between adjacent solar collectors (50) that is open to the condensate collector (52). A thin film stretching apparatus characterized in that multiple heat conductors (48) are connected to multiple heat collectors (50) for heat transfer.

2. The exhaust pipe (46) is the exhaust flow (S A The flow path is configured for the exhaust flow (S A The thin film stretching apparatus according to claim 1, which is located outside of the )

3. The thin film stretching apparatus according to claim 1, wherein the condensate collector (52) is provided in at least a portion of the exhaust pipe (46).

4. The condensate collector (52) is located in the exhaust flow (S A The thin film stretching apparatus according to claim 1, provided in at least a part of the

5. The thin film stretching apparatus according to claim 1, wherein the exhaust pipe (46) has a condensate outlet (56) that constitutes part of the condensate collector (52).

6. The thin film stretching apparatus according to claim 1, wherein the condensate collector (52) is provided with a receiving shelf (60).

7. The thin film stretching apparatus according to claim 1, wherein the heat recovery device (28) comprises a condensate discharge pipe (62) that is fluidly connected to a condensate collector (52).

8. The thin film stretching apparatus according to claim 1, wherein the heat collector (50) through which the heat conductor (48) passes is formed in the shape of a plate.

9. The thin film stretching apparatus according to claim 1, wherein the plurality of solar collectors (50) are arranged parallel to each other and / or parallel to the partition wall (54).

10. The thin film stretching apparatus according to claim 1, wherein the heat conductor (48) is arranged horizontally (H) or at an angle (α) between 0° and 10° with respect to the horizontal (H).

11. The thin film stretching apparatus according to claim 10, wherein the cross-sectional position of the heat conductor (48) of the exhaust pipe (46) is positioned lower than the cross-sectional position of the intake pipe (44).

12. The gap (68) formed between the solar collectors (50) allows for the exhaust flow (S A ) direction and exhaust flow (S A The thin film stretching apparatus according to claim 1, having a flow direction (F) of condensates that is parallel to each other with respect to the direction of ).

13. Exhaust flow (S A The thin film stretching apparatus according to claim 12, wherein the direction of the condensate and the flow direction (F) are formed at an angle between 0° and 10° with respect to the perpendicular (V) or perpendicular (V).

14. The gap (68) formed between adjacent solar collectors (50) allows for exhaust flow (S A ) direction and exhaust flow (S A The thin film stretching apparatus according to claim 1, comprising a flow direction (F) of condensates that is perpendicular to each other with respect to the direction of ).

15. Exhaust flow (S A ), the direction of which is horizontal, and the flow direction (F) of the condensate is vertical (V) or forms an angle β between 0° and 10° with respect to the vertical (V). The thin film stretching apparatus according to claim 14.

16. The thin film stretching apparatus according to claim 1, wherein the heat conductor (48) is a heat transfer device.

17. The thin film stretching apparatus according to claim 1, wherein the heating furnace (26) is provided with an air inlet (30) that is fluidly connected to the air supply pipe (44) of the heat exchanger (34) and / or the heating furnace (26) is provided with an exhaust port (32) that is fluidly connected to the exhaust pipe (46) of the heat exchanger (34).

18. The thin film stretching apparatus according to claim 1, wherein the heat recovery device (28) comprises a heating fan (40).

19. The thin film stretching apparatus according to claim 18, wherein the heating fan (40) is fluidly connected between the supply air pipe (44) of the heat exchanger (34) and the air inlet (30) of the heating furnace (26).

20. A thin film manufacturing apparatus comprising at least one thin film stretching apparatus (15) as described in claim 1, characterized in that, in addition to the thin film stretching apparatus (15), it also comprises an extruder (12), a casting rolling apparatus (14), and a drawing roller apparatus (20) and / or a winding device (22).

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