KR102079066B1 - Improved bonding device for a curved substrate - Google Patents

Abstract

The present invention relates to an improved bonding device for a curved substrate, which prevents a curved part from peeling off and a bubble layer from occurring by holding the end of a flexible material with a rotatable fixing part so that a curved portion of the flexible material firstly comes into contact with a curved substrate when attaching the flexible material such as a film to the curved substrate, especially during side lamination.

Description

IMPROVED BONDING DEVICE FOR A CURVED SUBSTRATE}

The present invention relates to a device for bonding a curved substrate, and more particularly, when bonding a flexible material such as a film to a curved substrate, the flexible material is held by holding the end of the flexible material by a rotatable fixing part, particularly during side lamination. The present invention relates to an improved curved substrate bonding apparatus that prevents the excitation of the curved portion and the generation of a bubble layer in such a way that the curved portion of the material is first contacted with the curved substrate.

Background Art Various types of display devices such as organic light emitting display devices and liquid crystal display devices are used in monitors of computers, portable terminals, and various information devices.

In these display devices, a display panel for displaying an image and a window for protecting it are attached to the direction in which the image is emitted. In order to attach the window to the display panel, the adhesive layer is applied on the display panel in a liquid state, and then the display panel and the window are bonded under normal pressure to cure the adhesive layer.

In the case of a flat panel display device, even if a method of bonding a display panel and a window using an adhesive layer under normal pressure is not generated, bubbles are not generated in the adhesive layer or adhesion is not generated. However, in the case of a curved display device having a curved shape, problems may occur in adhesion uniformity, air bubbles in the adhesive layer, alignment between the display panel and the window, and the like.

Typically, as shown in FIGS. 14 and 15, when bonding a flexible material 2, such as a protective film, to the curved substrate 1, the edge of the edge formed in the curved substrate 1 (bended Since the pressing force cannot be transmitted to the part), the flexible material 2 cannot be closely adhered to the boundary portion of the substrate 1, and there has been a problem due to excitation, defects caused by a bubble layer, and the like. In addition, various devices and the like have been used to prevent defects at the edge of the curved substrate 1, thereby increasing the overall time of the process, thereby reducing efficiency, or by using a new device. During this process, intermittent defects occurred and the reliability of the overall production process was lowered.

To solve this problem, conventionally, a variety of bonding devices have been introduced through Korean Patent Registration No. 10-1468973 and Korean Patent Registration No. KR10-1801559, but a liquid adhesive material such as LOCA film or OCR adhesive is applied to the panel. There is a problem in that an air gap in the form of air bubbles is formed on the bonding surface even when the window is bonded thereon, and the bonding process is performed under vacuum in a separate vacuum chamber. Accordingly, there is a problem in that the cost required for the vacuum chamber and other vacuum equipment is increased, and the work efficiency is reduced due to the complicated device and process.

KR 10-1468973 B1 KR 10-1801559 B1

An object of the present invention is to hold the end of the flexible material by a rotatable fixing part, especially when performing a side lamination when bonding a flexible material such as a film to the curved substrate so that the curved portion of the flexible material is first contacted to the curved substrate It is to provide an improved curved substrate bonding apparatus that prevents the occurrence of excitation of the curved portion and the generation of a bubble layer in a manner.

Other objects and advantages of the present invention will be described below, and will be learned by examples of the present invention. In addition, the objects and advantages of the present invention can be realized by means and combinations indicated in the claims.

According to an aspect of the present invention, an improved curved substrate bonding apparatus comprising: a substrate jig unit having a substrate seating portion having a shape corresponding to the substrate to fix the curved substrate; The pair of first and second fixing portions installed to face the substrate jig portion and spaced apart from each other so as to fix both sides of the flexible material attached to the substrate, having a structure that can be rotated up and down, First and second fixing parts; A lifting part provided between the first and second fixing parts and provided to move up and down toward the substrate jig part; And provided on the lifting portion to press the flexible material toward the substrate jig portion, and elastically deform when the lifting portion is lifted to first press the flexible material so that it is in line contact with the center portion of the substrate, and then the flexible material. And a pressing pad portion for pressing the material to the side portion of the substrate a second time, while the pressing pad portion presses the flexible material to the side portion of the substrate for a second time, the first and second fixing portions are fixed in a predetermined direction upward. It is rotated by an angle so as to hold the end of the flexible material so that the curved portion of the flexible material first contacts the curved substrate, and the first and second fixing portions can respectively rotate a grip member that fixes both sides of the flexible material. The combined grip member block, the driving unit for moving the grip member block, the It is fixed vertically to the upper surface of the base plate around the lip member block, and includes a cam block having an inclined surface for changing the fixed angle of the grip member, one end of the grip member is engaged with a spring member and the other end of the cam block It is characterized in that it is combined with a cam follower slidably disposed along the inclined surface.

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In addition, the grip member includes a square groove portion for fixing the flexible material, and an inclined portion for holding the end of the flexible material when the grip member is rotated, and the inclination angle of the inclined portion is in a range between 40 and 50 °. It is characterized by being.

In addition, the inclined portion, after coating the ultraviolet curing surface treatment agent is added with an antistatic agent and a spherical bead, it is characterized in that it comprises ultraviolet light-cured and exposed on the outer surface of the inclined portion, the spherical beads protruding and uneven.

In addition, an elastic layer having a dual structure having an expansion and contraction rate corresponding to the expansion or contraction of the compression pad portion is formed on the outer surface of the compression pad portion, wherein the elastic layer has a relatively thick thickness adhered to the surface of the compression pad portion. It includes a first elastic layer and a second elastic layer having a relatively thin thickness, characterized in that a plurality of air layers are formed in the first elastic layer is an empty space.

In addition, the first elastic layer is formed of low density polyethylene (LDPE), and the second second elastic layer is characterized by being formed of high density polyethylene (HDPE).

In addition, a pair of auxiliary compression units are built into the edge portion of the compression pad unit, and the auxiliary compression unit includes a main tube member in a triangular shape in cross section having a structure inflated by pressurization of the gas, and an upper portion of the main tube member. It characterized in that it comprises a curved crimped portion in the shape of a cross-section to be attached.

In addition, the main tube member is characterized in that it comprises a base tube member plate having a relatively thick thickness and a side tube member plate having a relatively thin thickness.

In addition, the main tube member is characterized in that the hole is formed to communicate with the inside of the main tube member, further comprising a sub-tube member configured to flow gas through the hole when gas is injected into the main tube member .

In addition, it characterized in that it further comprises a pressure adjusting unit configured to adjust the pressure of the main tube member by selectively connecting the inner and outer spaces of the main tube member.

In addition, the pressure control unit, the plate-shaped member is formed with a gas outlet so as to connect the inner and outer spaces of the main tube member, and is integrally coupled to the bottom surface of the plate-shaped member, the outer peripheral surface is formed with a plurality of through-holes connected to the outside It is characterized in that it comprises a part, a motor part installed to be fixed to the inner space of the case part and selectively driven under the control of the control part, and an intermittent part coupled to the front end of the motor part to regulate the opening angle of the gas outlet. .

According to the present invention as described above, when attaching a flexible material such as a film to the curved substrate, the curved portion of the flexible material is held by holding the end of the flexible material by a rotatable fixing part, particularly during side lamination. It has an effect of preventing the excitation of the curved portion and the generation of a bubble layer in a manner that the first contact is made.

In addition, according to the present invention, there is an additional effect of efficiently fixing without limitation to the shape of the curved substrate and the characteristics and thickness of the flexible material provided in the curved substrate.

1 is a view schematically showing a bonding device for an improved curved substrate according to an embodiment of the present invention,
2 to 5 are views schematically showing a process of bonding a flexible material to a curved substrate using a bonding device for a curved substrate according to an embodiment of the present invention,
6 is a view schematically showing the configuration of the first and second fixing parts of FIG. 1,
7 is a view schematically showing an operation process of the first and second fixing parts of FIG. 1,
8 is an enlarged view of part A of FIG. 5,
9 is a view showing the configuration of the compression pad according to an embodiment of the present invention,
10 is a view showing the configuration of a compression pad according to another embodiment of the present invention,
11 is a view showing the configuration of a tube member according to an embodiment of the present invention,
12 is a view showing the configuration of the pressure control unit of Figure 11,
13 is a view showing the configuration of a tube member according to another embodiment of the present invention,
14 is a view showing a state in which a flexible material is generally provided on a curved substrate,
15 is an exploded view of FIG. 14.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the spirit of the present invention is not limited to the presented embodiments, and a person skilled in the art who understands the spirit of the present invention may add another component within the scope of the same spirit, change, delete, etc. Other embodiments that are included within the scope of the invention idea can be easily proposed, but this will also be included within the scope of the invention.

In addition, components having the same function within the scope of the same idea appearing in the drawings of the respective embodiments will be described using the same reference numerals.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, showing preferred embodiments.

In describing the present invention, when it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 is a view schematically showing a bonding device for an improved curved substrate according to an embodiment of the present invention, and FIGS. 2 to 5 are curved surfaces using a bonding device for a curved substrate according to an embodiment of the present invention. FIG. 6 is a view schematically showing a process of bonding a flexible material to a molded substrate, FIG. 6 is a view schematically showing the configuration of the first and second fixing parts of FIG. 1, and FIG. 7 is a first and second view of FIG. 1 8 is a view schematically showing an operation process of the fixing part, FIG. 8 is an enlarged view of part A of FIG. 5, FIG. 9 is a view showing the configuration of a compression pad part according to an embodiment of the present invention, and FIG. 10 is 11 is a view showing the configuration of a compression pad unit according to another embodiment of the present invention, FIG. 11 is a view showing the configuration of a tube member according to an embodiment of the present invention, and FIG. 12 is a view showing the configuration of the pressure regulating unit of FIG. Fig. 13 shows the present invention. It is a diagram showing the configuration of a tube member according to another embodiment of the invention.

First, referring to Figure 1, the curved substrate bonding apparatus 100 according to an embodiment of the present invention, the substrate jig portion 110, a pair of first and second fixing portion 120, lifting portion ( 130), and a compression pad portion 140.

The substrate jig portion 110 is provided with a substrate mounting portion 111 having a shape corresponding to the substrate 1 so as to fix the curved substrate 1, and the substrate mounting portion 111 is the curved substrate 1 ). For example, in the substrate jig portion 110, the substrate seating portion 111 may be integrally provided, or may be provided to be detachable from the substrate jig portion 110.

The first and second fixing parts 120 may be provided to face each other in a pair. As described later, the first and second fixing portions 120 are provided on the lower side of the substrate jig portion 110 to correspond to the shape of the curved surface of the curved substrate 1, the flexible material 2 It can bend, and fixing the position of the flexible material (2) so that the bonding process with the substrate (1) can be performed efficiently.

Here, the curved substrate 1 is any one of glass having curved surfaces of the second to fourth surfaces, and the flexible material 2 is a protective film provided to cover the outer surface of the curved substrate 1 You can.

Basically, the grip member 121 may be fixed so that the flexible material 2 is flat by applying a predetermined tension so that the central portion of the flexible material 2 does not stretch to the lower side.

In addition, each of the grip members 121 provided in the first and second fixing parts 120 may be movable to be close to each other by the action of the driving part 122.

In addition, the first and second fixing portions 120 are installed to face the substrate jig portion 110 and are spaced apart from each other so as to fix both sides of the flexible material 2 attached to the substrate 1 The flexible material 2 can be bent by having a structure that can be rotated up and down.

The lifting part 130 may be provided between the first and second fixing parts 120 to move up and down toward the substrate jig part 110.

The lifting portion 130 is provided with the substrate jig portion 110 adjacent to the flexible material 2, and then the substrate jig portion (b) so as to contact the curved flexible material 2 with the curved substrate 1 110) You can rise to the side. On the other hand, bending of the flexible material 2 may be performed after the substrate jig portion 110 is lowered or before the substrate jig portion 110 is lowered, but is not limited thereto.

The crimping pad portion 140 is provided on the lifting portion 130 to press the flexible material 2 toward the substrate jig portion 110, but is elastically deformed when the lifting portion 130 is lifted to be flexible. After the first pressing so that the material 2 is in line contact with the center portion of the substrate 1, the flexible material 2 is configured to press the second side to the side portion of the substrate 1.

Here, the compression pad portion 140 may be formed of a polymer silicone or urethane rubber material to have a structure deformed by pressure.

In particular, while the pressing pad portion 140 presses the flexible material 2 to the side portion of the substrate 1 for a second time, the first and second fixing portions 120 have a fixed angle preset in the upper direction. It is rotated as much as possible to hold the end of the flexible material 2 so that the curved portion of the flexible material 2 comes into contact with the curved substrate 1 first.

2 to 5 are views schematically showing a process of bonding a flexible material to a curved substrate using a bonding device for a curved substrate according to an embodiment of the present invention.

Referring to FIG. 2, after loading the curved substrate 1 and the flexible material 2, the first and second fixing parts 120 move forward.

Referring to FIG. 3, the grip members 121 of the first and second fixing parts 120 are rotated to bend the flexible material 2 (primary rotation). At this time, in the crimping pad portion 140, the substrate jig portion 110 is provided adjacent to the flexible material 2.

Referring to FIG. 4, the pressing pad portion 140 is lifted toward the substrate jig portion 110 by the lifting portion 130 so that the flexible material 2 bent contacts the curved substrate 1. At this time, the central portion of the bent flexible material 2 is in primary contact with the central portion of the curved substrate 1, and the first and second fixing portions 120 are further rotated (secondary rotation).

Referring to FIG. 5, the crimping pad portion 140 is further raised to perform upper surface bonding, and at the same time, a 90 ° side bonding process is performed. When 90 ° side bonding, that is, when the pressing pad portion 140 presses the flexible material 2 to the side portion of the substrate 1, the grip member 121 is rotated at the maximum inclination angle. At this time, the grip member 121 is held at the end of the flexible material 2, so that the position of the flexible material 2 can be fixed so that the side bonding process with the substrate 1 can be effectively performed.

As shown in FIG. 6, the first and second fixing parts 120 are grip member blocks 123 to which the grip members 121 for fixing both sides of the flexible material 2 are rotatably coupled, respectively. The driving unit 125 for moving the grip member block 123, and vertically fixed to the upper surface of the base plate 122 around the grip member block 123, the inclined surface for changing the fixed angle of the grip member 121 It may be configured to include a cam block 124 having (124a).

One end of the grip member 121 may be combined with a spring member 127 and the other end may be combined with a cam follower 129 slidably disposed along the inclined surface 124a of the cam block 124.

The grip member 121 includes a square groove portion 1211 for fixing the flexible material 2 and an inclined portion 1212 for holding the end of the flexible material 2 when the grip member 121 is rotated. Including, the inclination angle of the inclined portion 1212 may be a range between 40 and 50 °.

7 is a view schematically showing the operation process of the first and second fixing parts of FIG. 1 (showing mainly about the rotation of the grip member 121), (a) curved substrate 1 and flexible After loading the material 2, the drive unit 125 moves the grip member block 123 forward, and the cam follower 129 is maintained while elasticity is maintained by the spring members 127 (b) to (d). While sliding along the inclined surface 124a of the cam block 124, the grip member 121 is rotatable, wherein the rear end of the grip member 121 is lowered and the tip of the grip member 121 is raised, (e) Finally, when the flexible material 2 is secondly pressed to the side portion of the substrate 1 (at 90 ° side bonding), the inclined portion 1212 of the grip member 121 has the maximum inclination angle. It is rotated to hold the end of the flexible material (2), thus fixing the position of the flexible material (2) to the cementation hole with the substrate (1) It is possible to ensure that the purification is performed effectively.

Preferably, the inclined portion 1212 can easily hold the end of the flexible material 2 by increasing the holding force by including irregularities (see FIG. 8).

For example, the inclined portion 1212 is coated with an ultraviolet curable surface treatment agent layer 1214 to which an antistatic agent and spherical beads 1213 are added, and then ultraviolet cured to expose the outer surface of the inclined portion 1212, The spherical beads 1213 may include unevenness 1216 protruding.

Here, the antistatic agent may be included for the purpose of preventing static electricity. For example, surfactants such as sulfonate, alkyltrimethylammonium chloride, and alkyldimethyl aminoacetate betaine may be used, and in this embodiment, alkyltrimethylammonium chloride is used. Can be used.

Beads are composed of organic materials made of polymer materials including polypropylene (Polypropyren, PP), polyethylene (PE), polyurethane (PU), or epoxy, and formed into a spherical shape having a diameter of 120 to 130 μm.

In applying the UV curing surface treatment agent, by adding spherical beads of several to several tens of µm to the UV curing surface treatment agent, the beads after curing of the UV curing surface treatment agent by UV light can be exposed, thereby making the surface uneven. Can be given. At this time, the thickness of the coating film to which the paint is applied may be less than the bead size to maximize the effect.

According to an embodiment, an elastic layer 142 having a dual structure having an expansion and contraction rate corresponding to the expansion or contraction of the compression pad portion 140 may be formed on the outer surface of the compression pad portion 140 (FIG. 9).

The elastic layer 142 includes a first elastic layer 1421 having a relatively thick thickness and a second elastic layer 1422 having a relatively thin thickness, which are adhered to the surface of the compression pad portion, and the first elastic A plurality of air layers 1423, which are empty spaces, may be formed in the layer 1421 for a buffer effect.

The first elastic layer 1421 is formed of low density polyethylene (LDPE), and the second second elastic layer 1422 is formed of high density polyethylene (HDPE). You can.

The high-density polyethylene (HDPE) is a hard polyethylene made by a low-pressure method or a medium-pressure method, and is excellent in moisture resistance and has a higher melting point than low-density polyethylene (LDPE), which will be described later, and thus has excellent heat resistance.

The low-density polyethylene (LDPE) is a low-density, soft polyethylene produced at high pressure, having excellent flexibility, and having a lower melting point than the high-density polyethylene, and thus having excellent heat-sealing properties.

As another embodiment, a pair of auxiliary compression units 150 are formed in the space portion 145 formed in the longitudinal direction (a direction perpendicular to the drawing) along the edge portion 141 inside the compression pad portion 140. It can be embedded (see Figure 10).

The auxiliary compression unit 150 is made of a flexible material, and the gas is injected therein to expand, so that the elastically deformed compression pad unit 140 attaches the flexible material 2 to the shape of the curved substrate 1. It is configured to apply a more uniform force as a whole.

The auxiliary compression unit 150 includes a main tube member 152 in a triangular shape having a structure inflated by pressurization of a gas, and a curved crimping section in a cross-sectional shape attached to the top of the main tube member 152 (154).

The main tube member 152 may include a base tube member plate 152a having a relatively thick thickness and a side tube member plate 152b having a relatively thin thickness.

When gas is injected into the main tube member 152, the side tube member plate 152b side is relatively more expanded than the base tube member plate 152a because the base tube member plate 152a is thicker than the side tube member plate 152b. Can be.

In this way, since the side tube member plate 152b can be expanded more than the base tube member plate 152a, the side tube member plate 152b can be more convexly curved in the lateral direction.

Therefore, the side tube member plate 152b can more effectively press the curved crimped portion 154 in a cross-sectional shape, and as a result, the elastically deformed crimped pad portion 140 is used to deflect the flexible material 2 from the curved surface. It becomes possible to apply a more uniform force as a whole to correspond to the shape of the mold substrate 1.

Reference numeral 153 is a gas injection unit, and reference numeral 155 is a gas supply pipe.

11 and 12, the main tube member 152 is a pressure control unit 160 configured to adjust the pressure of the main tube member 152 by selectively connecting the inner and outer spaces of the main tube member 152 ) May be further included.

The pressure control unit 160, the plate member 161 is formed with a gas outlet (161a) to connect the inner and outer spaces of the tube member 130, the outer peripheral surface while being integrally coupled to the bottom surface of the plate member 161 The case portion 162 is formed to be fixed to the inner space of the case portion 162 and a plurality of through-holes 162a connected to the outside, the motor selectively driven under the control of a control unit (not shown) It comprises a part 163 and an intermittent part 165 coupled to the front end of the motor part 163 to interrupt the opening angle of the gas outlet 161a.

Here, the pressure regulating unit 160 may selectively connect the inner and outer spaces of the tube member 130 under the control of the control unit to adjust the pressure of the tube member 130.

As another embodiment, the main tube member 152 is formed with a hole 157 to communicate with the inside of the main tube member 152, the hole 157 when gas is injected into the main tube member 152 It may further include a sub-tube member 156 configured to flow gas (see FIG. 13).

Here, the gas injection hole 130 in which the gas passage hole 131 is formed is coupled to the center of the hole 157, and when the gas passage hole 131 of the gas injection hole 130 is not injected into the main tube member 152 , Maintaining a trapezoidal cross-sectional shape, and when injecting gas into the main tube member 152, the inlet of the gas passing hole 131 may be opened.

In the above, the configuration and features of the present invention have been described based on the embodiments according to the present invention, but the present invention is not limited to this, and various modifications or changes can be made within the spirit and scope of the present invention. It will be apparent to those skilled in the art, and thus, such changes or modifications are found to fall within the scope of the appended claims.

DESCRIPTION OF SYMBOLS 1 Curved board | substrate 2 Flexible material
100: curved substrate bonding device 110: substrate jig
120: first and second fixing portion 130: lifting portion
140: crimping pad portion

Claims (11)

A substrate jig portion having a substrate seating portion having a shape corresponding to the substrate to fix the curved substrate;
The pair of first and second fixing portions which are installed to face the substrate jig portion and are spaced apart from each other so as to fix both sides of the flexible material attached to the substrate, having a structure that can be rotated up and down. First and second fixing parts;
A lifting part provided between the first and second fixing parts and provided to move up and down toward the substrate jig part; And
It is provided on the lifting portion to press the flexible material toward the substrate jig portion, the elastic material is elastically deformed when the lifting portion is lifted to first press the flexible material in line contact with the center portion of the substrate, and then the flexible material It includes a pressing pad portion for a second pressure to the side portion of the substrate,
While the pressing pad portion presses the flexible material to the side portion of the substrate for a second time, the first and second fixing portions are rotated by a predetermined fixed angle in the upper direction to hold the ends of the flexible material to curve the flexible material. Let the additional contact with the curved substrate first,
Each of the first and second fixing parts is a grip member block to which a grip member for fixing both sides of the flexible material is rotatably coupled, a driving unit for moving the grip member block, and perpendicular to an upper surface of the base plate around the grip member block. Is fixed to, and includes a cam block having a slope for changing the fixed angle of the grip member,
An improved curved substrate bonding apparatus, characterized in that one end of the grip member is coupled with a spring member and the other end is coupled with a cam follower slidably disposed along the inclined surface of the cam block. delete According to claim 1,
The grip member includes a square groove portion for fixing the flexible material, and an inclined portion for holding the end of the flexible material when the grip member is rotated, wherein the inclined angle of the inclined portion is in a range between 40 and 50 ° Improved curved substrate bonding device. According to claim 3,
The inclined portion, after coating the UV curing surface treatment agent added with an antistatic agent and a spherical bead, the UV cured and exposed to the outer surface of the inclined portion, the improved curved type, characterized in that it comprises an unevenness protruding the spherical bead Substrate bonding device. According to claim 1,
On the outer surface of the compression pad portion, an elastic layer having a dual structure having an expansion and contraction rate that can correspond to expansion or contraction of the compression pad portion is formed, and the elastic layer has a first thickness having a relatively thick thickness adhered to the surface of the compression pad portion. An improved curved substrate bonding apparatus comprising an elastic layer and a second elastic layer having a relatively thin thickness, wherein a plurality of empty air layers are formed in the first elastic layer. The method of claim 5,
The first elastic layer is formed of low density polyethylene (LDPE), the second elastic layer is improved curved substrate bonding apparatus, characterized in that formed by high density polyethylene (HDPE). According to claim 1,
Inside the compression pad portion, a pair of auxiliary compression portions are embedded in the edge portion, and the auxiliary compression portion is a triangular-shaped main tube member having a structure inflated by pressurization of the gas, and is attached to an upper portion of the main tube member Improved curved substrate bonding apparatus, characterized in that it comprises a curved crimped portion in the shape of a cross-section. According to claim 1,
An improved curved substrate bonding apparatus, characterized in that the main tube member includes a base tube member plate having a relatively thick thickness and a side tube member plate having a relatively thin thickness. The method of claim 8,
The main tube member has a hole formed to communicate with the inside of the main tube member, and further comprising a sub-tube member configured to flow gas through the hole when gas is injected into the main tube member. Curved board bonding device. The method of claim 8,
An improved curved substrate bonding apparatus further comprising a pressure adjusting unit configured to selectively connect the inner and outer spaces of the main tube member to adjust the pressure of the main tube member. The method of claim 10,
The pressure control unit, a plate-shaped member having a gas discharge port is formed to connect the inner and outer spaces of the main tube member, and a case part having a plurality of through holes connected to the outer circumferential surface while being integrally coupled to the bottom surface of the plate-shaped member Improved, characterized in that it comprises a motor unit which is installed to be fixed to the inner space of the case portion and selectively driven under the control of the control unit, and an intermittent unit coupled to the front end of the motor unit to regulate the opening angle of the gas outlet. Curved board bonding device.

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