KR20170116538A - apparatus for curing substrate - Google Patents

Abstract

The present invention relates to a substrate curing apparatus, and more particularly, to a substrate curing apparatus that includes a cell tray in which a substrate or a coating layer on a substrate is cured by using hot air to load a plurality of substrates to be cured, And the hot air can be continuously circulated in the chamber, thereby reducing the time, effort, and cost for curing the substrate and improving the curing efficiency of the substrate. ≪ / RTI >
The constituent means constituting the substrate curing apparatus of the present invention is a substrate curing apparatus comprising a chamber in which an internal space is formed and a tray cassette disposed in the chamber and having a structure capable of mounting a substrate to be cured, The hot air is caused to flow in one side space of the cassette and the hot air is moved to the other side space of the tray cassette across the tray cassette and then moved to one side space of the tray cassette again to be circulated, And performing a curing process on the substrate to be cured.

Description

Apparatus for curing substrate

The present invention relates to a substrate curing apparatus, and more particularly, to a substrate curing apparatus that includes a cell tray in which a substrate or a coating layer on a substrate is cured by using hot air to load a plurality of substrates to be cured, And the hot air can be continuously circulated in the chamber, thereby reducing the time, effort, and cost for curing the substrate and improving the curing efficiency of the substrate. ≪ / RTI >

The touch screen panel, which has recently been used as a new input device with smart phones, is being expanded to include tablet PCs, notebooks, monitors, TVs, etc. In response to the demand for slimmer, lighter, higher quality, .

Such a touch screen panel is an input device that can easily use a computer or the like with interactive and intuitive operation by simply touching a button displayed on a display with a finger. The touch screen panel includes a touch panel, a controller IC, and a driver SW.

Such a touch screen panel may be a resistive type, a capacitive type, an ultrasonic type, or an infrared type depending on the operation principle. Due to many advantages such as high reliability, excellent performance, fast response speed, and multi-touch implementation, many capacitive methods have been adopted and used.

As such a capacitance method, a method using a transparent electrode of ITO film or ITO glass is mainly applied. However, the electrostatic capacity method is difficult to apply to a middle- or large-sized touch screen due to the low conductivity of the ITO transparent electrode, and the price of indium as a rare earth metal is high, raising the price of the product.

In order to overcome these disadvantages, there is an increasing demand for a metal mesh structure in order to realize middle and large sized touch screen panels and flexible display panels. The metal mesh structure is an electrostatic touch using a metal material, and a highly conductive metal layer, that is, silver (Ag) or copper (Cu) is arranged in an orthogonal manner on a transparent substrate (glass or film) to form an electrode.

However, in such a metal mesh structure, there is a problem that a visibility problem and a moiré phenomenon occur. The visibility problem is a phenomenon in which the shiny metal pattern is visible when the finished product is realized, and the moiré phenomenon is a phenomenon in which the shiny metal mesh pattern and the grid pattern of the display are added together and appear like waves. The metal mesh pattern is formed on the haze pattern, and the signal electrode is formed on the bezel printing surface.

The signal electrodes formed on the metal mesh pattern and the bezel printing surface are all formed of a metal layer formed on the substrate and an overcoat layer OC may be formed on the metal layer to protect the metal layer and to improve visibility .

The metal layer and the overcoat layer formed on the substrate may all be applied by an ink jet method, and in this case, the ink must contain a lot of solvent components. As a prior art related thereto, Korean Patent No. 10-1182514 discloses a " thermal curing apparatus for vacuum drying and a vacuum drying thermal curing method ".

However, the prior art describes only the structure of one device capable of performing thermal curing by a heating plate only in a vacuum state, and only a process and apparatus capable of curing a substrate or a coating layer on the substrate by hot air There is no suggestion at all about this.

Korean Registered Patent No. 10-1182514 (2012. 09. 12. Announcement, title of invention: thermal curing apparatus for vacuum drying and vacuum drying thermal curing method)

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a cell tray, , The hot air can be circulated in the chamber in a uniform air flow and the hot air can be continuously circulated in the chamber, thereby reducing the time, effort and cost for curing the substrate, And to provide a substrate curing apparatus capable of increasing the thickness of the substrate.

According to an aspect of the present invention, there is provided a substrate curing apparatus comprising: a chamber in which an inner space is formed; and a structure disposed in the chamber and capable of mounting a substrate to be cured Wherein the tray cassette includes a tray cassette and hot air is generated in one side space of the tray cassette and the hot air is moved to the other side space of the tray cassette across the tray cassette, So as to perform a curing process for the substrate to be cured to be mounted on the tray cassette.

The inner space of the chamber includes a hot air curing space in which the tray cassette is disposed, a hot air generating space formed in one side space of the hot air curing space to generate hot air using air sucked from the outside, A hot air injection space portion formed between the hot air curing space portion and the hot air curing space portion to diffuse and supply hot air blown from the hot air generating space portion to the hot air curing space portion, And a hot air circulation space part provided adjacent to a rear surface side of the hot air curing space part for supplying hot air to the hot air generating space part and circulating the hot air conveyed from the hot air collecting space part, .

The hot air generating space includes a heater module for heating air sucked from the outside, and a fan module for sucking the heated air to blow air to the hot air injecting space.

In addition, a diffuser is installed between the hot air injection space and the hot air curing space to diffuse the hot air supplied from the hot air injection space and transfer the hot air to the hot air curing space.

The tray cassette disposed in the hot air curing space includes a lower frame, an upper frame disposed opposite to the upper side of the lower frame, a side frame connecting the side surfaces of the upper frame and the lower frame in a vertical direction, A rear support frame connected to the rear frame in the vertical direction, a side support bar mounted on the side frame and continuously arranged in the vertical direction, a center support bar mounted on the rear frame, Wherein the side support bar and the center support bar, which are arranged at the same height, constitute a slot in which the cell trays can be seated and supported.

Here, when there is a spacing space between the side support bars continuously arranged in the vertical direction, a perforation bar in which a through hole is formed continuously is disposed in the spacing space and is coupled to the side frame.

According to the present invention, there is provided a substrate curing apparatus for drying a substrate or a coating layer on a substrate using hot air to cure the substrate, wherein a cell tray capable of stacking a plurality of substrates to be cured is provided in the chamber The hot air can be circulated continuously in the chamber and the hot air can be continuously circulated in the chamber. Therefore, it is possible to reduce the time, effort and cost for hardening the substrate, There is an advantage that the efficiency can be increased.

FIG. 2 is a front view, FIG. 3 is a rear view, FIG. 4 is a left side view, and FIG. 5 is a right side view of the substrate curing apparatus according to the embodiment of the present invention.
FIG. 6 is a perspective view showing the inside of the substrate curing apparatus according to the embodiment of the present invention, FIG. 7 is a transparent perspective view, and FIG. 8 is a plan view.
FIG. 9 is a perspective view showing a state in which a cell tray is mounted on a tray cassette constituting a substrate curing apparatus according to an embodiment of the present invention, FIG. 10 is a perspective view in a state in which the cell cassette is not mounted, Fig.
FIG. 12 is a front view showing an arrangement structure of a heater plate disposed on the lower side of a tray cassette according to the present invention, and FIG. 13 is an exemplary view of a perforated plate according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of a substrate curing apparatus of the present invention having the above-described problems, solutions and effects as described above will be described in detail with reference to the accompanying drawings.

The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator.

Fig. 1 is a perspective view of a substrate curing apparatus according to an embodiment of the present invention, Fig. 2 is a front view, Fig. 3 is a rear view, Fig. 8 is a transparent plan view.

1 to 8, a substrate curing apparatus 100 according to an embodiment of the present invention basically includes a chamber 10 in which an inner space is formed and a substrate 10 disposed in the chamber 10, And a tray cassette 30 having a structure capable of being mounted.

The chamber 10 accommodates the tray cassette 30 and provides a space where hot air can be moved and circulated by wind pressure. The tray cassette 30 is disposed in an inner space of the chamber 10, and has a structure in which a plurality of substrates to be cured can be mounted therein. Specifically, the tray cassette 30 has a structure in which a cell tray 1 in which a plurality of cells are regularly placed and arranged can be inserted and supported.

On the other hand, the hot air circulating and circulating in the inner space of the chamber 10 should not be leaked to the outside during the curing process with respect to the substrate. Therefore, a shutter s is mounted on the front surface of the tray cassette 30. [ The shutter s is opened in the process of pulling the cell tray 1 into the tray cassette 30 and the curing process is performed through hot wind after all the cell trays 1 are introduced into the tray cassette 30 It is closed when performing.

Meanwhile, the tray cassette 30 may be divided into a plurality of pieces in the vertical direction. That is, the tray cassette 30 may include a plurality of divided spaces. In this case, the shutter s is disposed on the front surface of the tray cassette 30 corresponding to the divided space, and is controlled to open or close the corresponding divided space.

As described above, the substrate curing apparatus 100 according to the present invention including the chamber 10 and the tray cassette 30 generates hot air in one side space of the tray cassette 30, The tray cassette 30 is moved to the other space of the tray cassette 30 across the cassette 30 and then moved to one side space of the tray cassette 30 to be circulated. A curing process is performed on the substrate.

7 and 8, hot air is generated in a space (hot air generating space portion 11) formed at one side of the tray cassette 30, and the hot air is placed in the tray cassette 30 by wind pressure Is moved to a space formed on the other side of the tray cassette (30) across a space (hot air curing space (15)) in which the hot air curing space (15) (Hot air circulation space 19) of the rear side of the indoor unit 10 to the hot air generating space part 11 to be circulated as a whole.

Therefore, each of the cells (substrates) that are seated in the cell mounting portion 2 of the cell tray 1, which is placed in the tray cassette 30, can be continuously dried and cured by the circulating hot air, It is possible to reduce the time, labor and cost for hardening the substrate, and improve the curing efficiency.

The chamber 10 should have a space in which the tray cassette 10 can be disposed and have a space capable of generating, supplying, recovering, and circulating the hot air. To this end, the chamber 10 is divided into various spaces of the shape shown in FIGS. 7 and 8 in its interior.

Specifically, the inner space of the chamber 10 includes a hot air curing space 15 in which the tray cassette 30 is disposed, a space formed in one side space of the hot air curing space 15, A hot air generating space 11 for generating hot air and generating hot air blown from the hot air generating space part 11 formed between the hot air generating space part 11 and the hot air hardening space part 15, A hot air supply space 13 for supplying hot air to the space 15 and diffusing the hot air to the space 15 and supplying hot air to the space 15, A hot air circulation space part (17) and a hot air circulation space part (15) formed adjacent to a rear surface side of the hot air curing space part (15) and supplying hot air conveyed from the hot air collecting space part (17) to the hot air generating space part 19).

The hot air generating space part (11) is spaced apart from one side of the hot air curing space part (15) to generate hot air by heating the air introduced from the outside, and corresponds to a space for blowing the generated hot air. Accordingly, the hot air generating space 11 includes a heater module 23 for heating the air sucked from outside, and a fan module 25 for sucking the heated air and blowing the hot air to the hot air inlet space 13 do.

The air drawn into the hot air generating space 11 is drawn in through the air inlet 21 attached to the outside of the chamber 10. The sucked outside air may be naturally aspirated or may be sucked into the hot air generating space part 11 according to the operation of the fan module 25. [

The heater module 23 is fixedly attached to the hot air generating space 11 adjacent to the air inlet 31 so as to heat the air introduced into the hot air generating space 11. The hot air generated by the heater module 23 is sucked in accordance with the operation of the fan module 25 and blown into the hot air injection space 13.

The hot air generating space part (11) and the hot air applying space part (13) are separated by a first diaphragm (61). The reason why the hot air generating space part 11 and the hot air inflow space part 13 are divided by the first diaphragm 61 and the hot air flow path is narrowed and formed to be bent is that the fan module 25 To generate the wind pressure against the hot air blown from the outdoor unit.

The hot air conveyed to the hot air inlet space 13 is naturally conveyed to the hot air curing space 15 through wind pressure. Since the tray cassette 30 on which the substrate is mounted is disposed in the hot air curing space 15, the hot air supplied to the hot air curing space 15 must be uniformly diffused and supplied. A diffuser 50 for diffusing the hot air supplied from the hot air injection space 13 and transferring the hot air to the hot air curing space 15 is provided between the hot air injection space 13 and the hot air curing space 15, Is preferably mounted.

The diffuser 50 may be equipped with a mesh network to diffuse the heated air. Since the hot air is desirably transported directly to the hot air curing space part 15 in a diffused state, the mesh net is disposed in the vicinity of the hot air curing space part 15 of the both ends of the diffuser 50 It is preferable that it is mounted on the side end.

The hot air diffused and moved to the hot air curing space part 15 is dried by curing the substrate (cells) mounted on the tray cassette 30 disposed in the hot air curing space part 15. Through this process, the coating layer on the substrate or the substrate can be exposed to the hot air and can be cured through a drying process.

The hot air traveling across the hot air curing space 15 is moved to the hot air collecting space 17 by wind pressure. The hot air collecting space 17 is a space formed by the other side (left side in FIG. 8) of the chamber 10 and the side surface of the tray cassette disposed in the hot air hardening space 15.

The hot air moving to the hot air collecting space part 17 moves to the hot air circulating space part 19 disposed adjacent to the rear surface of the hot air curing space part 15 and the hot air flows through the hot air circulating supply path 19a And is moved to the hot air generating space part (11).

The hot air circulation space part 19 is separated from the hot air curing space part 15 by the second diaphragm 63. Therefore, hot air entering the hot air curing space 15 can not move directly to the hot air circulating space 19, and is moved to the hot air circulating space 19 through the hot air collecting space 17. As a result, hot air entering the hot air curing space 15 moves across the tray cassette 30 from one side to the other, so that all substrates can be uniformly exposed to hot air.

Meanwhile, the hot air, which is diffused through the diffuser 50 and is moved to the hot air curing space 15, is uniformly moved in all the points and directions to enter the hot air curing space 15, It is necessary for uniform curing. To this end, a perforation plate 70 is preferably interposed between the diffuser 50 and one side of the tray cassette (see FIG. 13).

The perforated plate 70 has a plate shape as shown in FIG. 13, and a plurality of perforations 71 are formed in a uniformly continuous and spaced relationship. Since the perforations 71 are formed in a regular arrangement, hot air entering the hot air curing space 15 through the perforated plate 70 can be uniformly moved in all points and directions. That is, the perforated plate 70 can uniformly move the hot air flow.

The perforated plate 70 may be interposed between the hot air collecting space 17 and the other side of the tray cassette 30 disposed in the hot air curing space 15. Therefore, hot air traveling from the hot air curing space 15 to the hot air collecting space 17 can maintain a uniform and stable air flow.

As described above, the hot air is moved from the hot air circulation space 19 to the hot air generating space 11 through the hot air circulation supply passage 19a, and the hot air is again supplied to the hot air supply space 13, the hot air curing space 15, the hot air collecting space 17, the hot air circulating space 19, and the hot air generating space 11.

That is, during the curing process, the hot air is circulated in the direction of ① → ② → ③ → ④ → ⑤ → ⑥ → ① as shown in FIG. Accordingly, the curing process through the drying process for the substrates mounted on the tray cassette 30 can be efficiently performed.

Meanwhile, when the curing process through the hot air is completed or the hot air needs to be exhausted for various reasons, the exhaust gas can be exhausted through the exhaust unit 90, which is disposed at the other side of the chamber 10. That is, hot air can be discharged to the outside through the exhaust line 71 connected to the hot air collecting space part 17 through valve control of the exhaust part 90 in the chamber 10.

According to the above-described substrate curing apparatus 100, hot air is generated inside the chamber 10 and is moved across from one side to the other side, so that a plurality of substrates mounted on the tray cassette 30 can be efficiently cured Can be performed.

Meanwhile, in order to increase the curing efficiency with respect to the substrates, the tray cassette 30 can uniformly flow the hot air currents without disturbing the movement of the hot air, and can stably mount as many substrates as possible do.

FIG. 9 is a perspective view of a tray cassette 30 loaded with a cell tray 1 applied to the present invention, and FIG. 10 is a perspective view of a state in which the cell tray 1 is not loaded.

As shown in FIG. 9, the tray cassette 30 has a structure capable of continuously stacking the cell trays 1 in the vertical direction. A cell seating part 2 on which the cell corresponding to the substrate can be placed is regularly arranged on the cell tray 1.

The tray cassette 30 capable of continuously stacking the plurality of cell trays 1 in the vertical direction is disposed in the hot air curing space 15 as described above. Therefore, the tray cassette 30 should have a structure in which hot air can be uniformly moved between the stacked cell trays 1.

9 and 10, the tray cassette 30 disposed in the hot air curing space 15 includes a lower frame 31, an upper frame 32 disposed opposite to the upper side of the lower frame 31, A side frame 33 connecting the side surfaces of the upper frame 32 and the lower frame 31 to each other in a vertical direction and a rear frame 33 connecting the rear surfaces of the upper frame 32 and the lower frame 31 in the vertical direction, A side support bar 35 mounted on the side frame 33 and continuously arranged in a vertical direction and a vertical support bar 35 mounted on the rear frame 34 and extending in the vertical direction And a center support bar 36 disposed continuously.

The side support bar 35 and the center support bar 36 disposed at the same height among the plurality of side support bars 35 and the center support bars 36 are disposed on the respective cell trays 1 Each of which can seat and support.

The lower frame 31, the upper frame 32, the side frames 33 and the rear frames 34 are not formed in a plate-like structure but are formed in a bar shape so as not to interfere with the flow of hot air.

The side frames of the lower frame 31 and the upper frame 32 are connected by a side frame 33 arranged in a vertical direction. One side of the lower frame 31 and one side of the upper frame 32 are connected by a first side frame and the other side of the lower frame 31 is connected to the other side of the upper frame 32. [ Are connected by a first side frame. As shown in FIGS. 9 and 10, the first side frame and the second side frame are each formed of two pieces in order to stably connect the upper frame and the lower frame.

The rear ends of the upper frame and the lower frame are connected to each other by the rear frame 34 so as to more firmly connect the upper frame 32 and the lower frame 31. [ The number of the rear frames 34 may be variable. In FIGS. 9 and 10, it is illustrated that the rear frames 34 are composed of three rear frames. On the other hand, the front surfaces of the upper frame and the lower frame do not have a separate connection frame so as not to interfere with the pulling-in or pulling-out of the cell tray 1.

In such a connection structure of the frame, a support bar capable of supporting and supporting the cell tray 1 is coupled to the side frame 33 and the rear frame 34. A side support bar 35 capable of supporting the side portion of the cell tray 1 is continuously connected to the side frame 33 in the vertical direction and the cell frame 1 And a center support bar 36 capable of supporting a center portion of the center support bar 36 are continuously connected in the vertical direction.

The side support bars 35 are coupled to the first side frame and the second side frame, respectively, so that the lower ends of both ends of the cell tray can be supported. The side support bars 35 are arranged continuously in the vertical direction, and the several side support bars 35 constitute one group, and the groups are spaced apart from each other by a predetermined distance. In FIG. 10, the three side support bars 35 are illustrated as one group, and the perforation bar 37 is shown in the spacing space formed between the groups.

The center support bar 36 is coupled to the rear frame and is configured to correspond to the side support bar 35. That is, the center support bars 36 are arranged in the vertical direction so as to have the same number, height, and spacing as the side support bars 35. Therefore, the side support bars and the center support bars disposed at the same height can constitute one slot for supporting the cell tray.

As described above, the inside of the tray cassette 30 can be divided into a plurality of divided spaces. A plurality of side support bars 35 and corresponding center support bars 36 are disposed in the respective divided spaces. For example, in each of the divided spaces, a group consisting of three side support bars and three groups corresponding to the three side support bars may be disposed. That is, three slots may be formed in each divided space.

The hot air moving across the tray cassette 30 having the above-described structure needs to have uniform air flow. Therefore, when there is a spacing space between the side support bars 35 arranged continuously in the vertical direction, a perforation bar 37 in which the through holes are continuously formed is disposed in the spacing space, .

For example, as shown in FIG. 10, in order to prevent intensive movement of hot air through the spacing space when spacing spaces are formed between the groups constituting the three side support bars, The perforation bar 37 on which the through holes are regularly arranged. As a result, the hot air moving through the side surface of the tray cassette 30 improves the uniformity of the air flow as a whole.

The side support bar 35 is formed to minimize the contact area with the cell tray 1. To this end, the side support bar (35) has a contact pin (38) on its top surface that can make point contact with the cell tray (1). Since the contact area between the side support bar and the cell tray is minimized, there is almost no heat transfer from the side support bar to the cell tray. Accordingly, a uniform curing process for a plurality of cells that are seated on the cell tray can be performed.

On the other hand, the hot air temperature inside the tray cassette 30 can be adjusted in the hot air generating space 11 described above. For example, the temperature of the hot air can be adjusted by adjusting the heating temperature of the heater module 23, or adjusting the intake air speed or the intake air amount. In some cases, additional heating adjustment means may be further provided to raise or adjust the internal temperature of the tray cassette 30. [

To this end, at least one heater plate 45 (see FIGS. 9, 10 and 12) may be disposed under the tray cassette 30 in the present invention. Specifically, in the structure in which the lower frame 31 is mounted on the seating frame 41 supported by the supporting frame 43, the heater plate 45 is disposed below the seating frame 41 , And is vertically mounted so as to be adjustable in position.

The heater plate 45 changes the heating force of the tray cassette 30 according to a distance from the seating frame 41. As a result, the internal temperature of the tray cassette can be adjusted by adjusting the vertical position of the heater plate.

A level bolt 47 for adjusting the vertical position of the heater plate 45 is coupled between the heater plate 45 and the seating frame 41 or the lower frame 31. [ That is, one end of the level bolt 47 is coupled to the upper surface of the heater plate 45, and the other end is coupled to the seat frame 41 or the lower frame 31. When the level bolt 47 is rotated in one direction, the heater plate moves upward or downward, and when the level bolt is rotated in the other direction, the heater plate moves downward or upward. Accordingly, the position of the heater plate in the vertical direction can be adjusted, and as a result, the temperature of the space inside the tray cassette can be adjusted.

Although the embodiments according to the present invention have been described, it is to be understood that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the following claims.

S: Shutter 1: Cell tray
2: cell seating part 10: chamber
11: Hot air generating space part 13: Hot air inflow space part
15: hot air curing space part 17: hot air collecting space part
19: hot air circulation space part 19a: hot air circulation supply path
21: intake port 23: heater module
25: Fan module 30: Tray cassette
31: lower frame 32: upper frame
33: side frame 34: rear frame
35: side support bar 36: center support bar
37: perforation bar 38: contact pin
41: seat frame 43: support frame
45: Heater plate 47: Level bolt
50: diffuser 61: first diaphragm
63: second diaphragm 70: perforated plate
71: Perforation 90:
91: exhaust line 100: substrate hardening device

Claims (6)

In the substrate curing apparatus,
And a tray cassette disposed in the chamber and having a structure capable of mounting a substrate to be cured,
The hot air is generated in one side space of the tray cassette and the hot air is moved to the other side space of the tray cassette across the tray cassette and then moved to one side space of the tray cassette again to circulate the tray cassette, And a curing step for the substrate to be cured mounted on the substrate.
The method according to claim 1,
The internal space of the chamber includes a hot air curing space in which the tray cassette is disposed, a hot air generating space formed in one side space of the hot air curing space to generate hot air using air sucked from the outside, A hot air injection space part formed between the hot air hardened space parts and diffusing and supplying hot air blown from the hot air generating space part to the hot air hardened space part; And a hot air circulation space part formed adjacent to a rear surface side of the hot air crying space part for collecting hot air and for supplying hot air conveyed from the hot air space part to the hot air generating space part and circulating the hot air. .
The method of claim 2,
Wherein the hot air generating space portion is provided with a heater module for heating air sucked from the outside and a fan module for sucking the heated air to blow air to the hot air injection space portion.
The method of claim 2,
Wherein a diffuser is installed between the hot air injection space and the hot air curing space to diffuse hot air supplied from the hot air injection space and transfer the hot air to the hot air curing space.
The method of claim 2,
The tray cassette disposed in the hot air curing space includes a lower frame, an upper frame disposed opposite to the upper side of the lower frame, a side frame connecting the side surfaces of the upper frame and the lower frame in a vertical direction, A side support bar mounted on the side frame and continuously arranged in a vertical direction, a center support bar mounted on the rear frame and continuously arranged in a vertical direction in the same manner as the side support bar, Wherein the side support bars and the center support bars disposed at the same height constitute slots in which the cell trays can be seated and supported.
The method of claim 5,
Wherein when the spacing space is provided between the side support bars continuously arranged in the vertical direction, a perforation bar in which a through hole is formed continuously is disposed in the spacing space and is coupled to the side frame.

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