KR20100046431A - A support bar for the substrate-loading cassette and the manufacturing method thereof - Google Patents

Abstract

PURPOSE: A support bar for a substrate loading cassette and a manufacturing method thereof are provided to prevent water or air from entering a hollow body by filling a body with foam. CONSTITUTION: A solid form is processed to have a hollow shape inside the body of a support bar(S110). A CFRP(Carbon Fiber Reinforced Plastic) is stacked on the surface of a processed foam(S125). A forming unit is made by integrating the mold shaped processed foam with the body(S140). If a thermoforming process is completed, the forming unit is separated from the outer mold(S150). The separated forming unit is cut and mechanically processed(S160).

Description

A support bar for the substrate-loading cassette and the manufacturing method

The present invention relates to a support bar provided in a cassette for loading a glass substrate, and more particularly, to be filled with a foam (foam) inside the hollow body, to reinforce the rigidity of the body by the foam filled therein And to distribute the load applied to the body, and at the same time relates to a support bar that can effectively block the inflow of water or air into the body.

In general, a flat panel display device such as a liquid crystal display (LCD) or a plasma display panel (PDP) undergoes a number of processes in its manufacturing process, and is a core component used as a display element. A cassette capable of stably loading and unloading a plurality of glass substrates (hereinafter, referred to as substrates) is used for efficient transfer of substrates between processes.

1 is a perspective view showing the entire structure of a conventional substrate loading cassette.

As shown in FIG. 1, the conventional substrate stacking cassette has an upper plate 10 and a lower plate 20 provided horizontally on the upper side and the lower side, respectively, and the upper plate 10 to connect the upper plate 10 and the lower plate 20 up and down. A plurality of vertical pillars 30 provided on both sides of the 10 and the lower plate 20, and a plurality of vertical pillars 30 which are provided at each vertical column 30 at regular intervals along their length direction to support both ends of the bottom surface of the substrate 5. The base plate 31, the plurality of supports 40 connected to the upper plate 10 and the lower plate 20, and the support plates 40 are installed at predetermined intervals along the longitudinal direction of each of the support plates 40. It is configured to include a plurality of support bars (50) for supporting.

Here, each of the support bars 50 is installed along the support 40 by coupling means such as bolts so as to be positioned at the same height as each substrate support 31 supporting the same substrate 5, and the substrate support 31 is provided. By supporting the substrate 5 together, the substrate 5 can be stacked in parallel without bending down. That is, when supporting both sides of the bottom surface of the substrate 5 only by the substrate support 31, the collision between the substrate 5 and the conveying means, such as a robot, in which an intermediate portion of the substrate 5 falls down and is loaded or unloaded into a cassette. In this case, at least one pair of support bars 50 may be disposed between the substrate holders 31 that support the same substrate 5, thereby preventing the risk.

FIG. 2 is a side cross-sectional view of the support bar shown in FIG. 1. FIG.

As shown in Figure 2, the support bar 50 provided in the conventional substrate loading cassette has a hollow beam structure to reduce the overall weight. In addition, an insert insertion hole 51 into which an insert 61 for fastening with the support 40 is inserted is formed at one end, and a sealing stopper insertion hole into which a sealing stopper 62 for sealing the inside is inserted. 52) is formed. The upper surface of the support bar 50 is formed with a tip insertion hole 53 into which a tip 63 of plastic material is inserted to absorb a shock and prevent scratches when the substrate is loaded.

Conventional hollow support bar configured as described above is subjected to a vertical load proportional to the weight of the substrate to be supported, preferably made of a material having a sufficient rigidity so that bending or deformation does not occur by the load applied from the substrate, It is usually made of aluminum or steel.

In particular, in recent years, as the flat panel display device has become large, the substrate, which is a liquid crystal display device of the flat panel display device, has also been enlarged and weighted. As a means for applying a heavy weight substrate, the support bar is increased by increasing the length of the support bar. There is a method of configuring the support bar with a structure that can distribute the load by increasing the contact area of the. However, as the length of the support bar increases, the overall weight of the cassette increases, structural deformation of the support bar on which the support bar is installed may increase, and manufacturing cost increases as the amount of material required increases. There is this.

Another method is to replace the support bar with a rigid and lightweight material, which can reduce the weight and structural deformation of the entire cassette, but it also increases the manufacturing cost, resulting in a price competitiveness. There is a problem that acts as a declining factor.

On the other hand, the support bar receives a variable load instead of a static load through the process of continuously loading and loading the board and reloading the loaded board, and thus stress applied to the inside of the support bar. stress also changes. Under such stress fluctuations, the upper surface of the conventional hollow support bar receives tension and compressive force on the lower surface of the conventional hollow support bar, and fatigue failure occurs due to stress fluctuations concentrated on the local part during long-term use. There is a problem.

In addition, in the substrate production line, regular cleaning of the cassette is performed at regular intervals. During the cleaning process, the water used for cleaning penetrates into the inside through a tip insertion hole, an insert insertion hole, or a sealing stopper insertion hole of a conventional hollow support bar. If the water penetrates and accumulates in the hollow of the support bar, it may fall on the substrate loaded under the support bar in a subsequent substrate loading process, which may cause a defect of the substrate.

The present invention is to solve the problem of the support bar for substrate loading cassette according to the prior art described above. That is, an object of the present invention is configured to be filled with a foam (foam) inside the hollow body, to reinforce the rigidity of the body by the foam filled inside and to distribute the load applied to the body, while at the same time It is to provide a support bar that can effectively block the inflow of water or air to the furnace.

The present invention as a technical concept for achieving the above object is provided with a support bar for a substrate loading cassette, characterized in that the hollow pillar-shaped body, the inside of the body is filled with a foam (foam).

In addition, the present invention comprises the steps of processing a solid foam in the shape of a hollow inside the body of the support bar to be processed; Laminating Carbon Fiber Reinforced Plastics (CFRP) on the surface of the processed foam; Preparing a molded body in which a foam processed into the inner mold shape is integrally formed inside the body by inserting the carbon fiber reinforced resin into the outer mold and then performing a heat molding process; Demolding the outer mold from the molded body when the heat forming process is completed; It provides a method of manufacturing a support bar for a substrate loading cassette, characterized in that it comprises a; cutting the length of the molded die and the machining of the outer mold.

Support bar for substrate loading cassette according to the present invention can increase the rigidity through the foam filled inside the body can reduce the wall thickness of the support bar to reduce the weight, large, high weight without using a high rigid material The substrate can be stably supported, thereby reducing the cost.

In addition, the present invention evenly distributes the load applied to the support bar by the foam filled in the body, thereby minimizing the risk of fatigue failure due to long-term repeated loading and unloading of the substrate to reduce the maintenance cost due to damage to the support bar There is also an effect that can be done.

In addition, in the present invention, since the path filled with water or air is closely blocked due to the foam filled in the support bar, substrate defects are generated due to leakage of water introduced in the cleaning process, and the interior of the drying process after cleaning. It is possible to prevent damage to the support bar due to air expansion in advance, thereby stabilizing the manufacturing process of the flat panel display device, it is also possible to produce high-quality products.

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

3 is an exploded perspective view illustrating a structure in which various parts are coupled to a support bar for a substrate loading cassette according to an embodiment of the present invention, and FIG. 4 is a side cross-sectional view of the support bar shown in FIG. 3.

As described above, the support bar is a component that supports a substrate by a plurality of support bars are installed at regular intervals along the longitudinal direction of the support bar connecting the upper plate and the lower plate of the substrate loading cassette. Support bar according to an embodiment of the present invention, as shown in Figures 3 and 4, a hollow rectangular pillar-shaped body portion 100, and the foam (foam) is filled in the interior of the body portion 100 150). In the present embodiment, the body portion 100 is formed in a hollow rectangular pillar shape, but may also be formed in a hollow pillar shape having various cross-sectional shapes such as circular, elliptical, and polygonal.

One end of the body portion 100 is formed with an insert insertion hole 110 into which an insert 210 is inserted for fastening with a support 40 (refer to FIG. 1) provided in a conventional substrate stacking cassette. A sealing stopper insertion hole 120 into which the sealing stopper 220 for sealing the inside of the 100 is inserted is formed. The upper surface of the body portion 100 is formed with a tip insertion hole 130 is inserted into the tip 230 of the plastic material for shock absorption and scratch prevention when loading the substrate, the tapered area inclined at a predetermined ratio in the longitudinal direction on the lower surface Is formed. As described above, the support bar according to the present invention has a structure in which the lower surface is inclined to reduce the deflection due to its own weight and reduce the risk of damage to the substrate due to the collision of the substrate and the support bar during loading or unloading of the substrate. In addition, the collision between the support bar and the transfer means (not shown) such as the transfer robot can be minimized.

Here, the material of the body portion 100 is composed of a hollow structure with an empty inside to minimize its own weight, in order to make up for the stiffness loss due to the rigidity than aluminum, which is a conventional material is not easily deformed, vibration damping rate It must be made of this excellent material. Materials satisfying these properties include fiber reinforced plastics (FRP), and among them, carbon fiber reinforced plastics (CFRP) having excellent rigidity are preferable. Here, CFRP refers to a hardened by impregnating an epoxy resin in a fabric or sheet made of carbon fibers known to have excellent specific strength, rigidity, and rupture strength.

In this embodiment, the carbon fiber used in CFRP was selected to obtain an appropriate range of rigidity in consideration of the characteristics of the support bar used for loading the substrate. For example, the carbon fiber having an elastic modulus of 23 to 25 ton / mm ² , Alternatively, a mixture of carbon fibers of 23 to 25 ton / mm ² and carbon fibers of 64 to 66 ton / mm ² may be used. In addition, carbon fiber may be mixed with other materials such as fiber glass reinforced plastic (GFRP) and aramid fiber according to cost reduction and other required characteristics.

On the other hand, the material of the foam 150 filled in the interior of the body portion 100 can be largely divided according to its manufacturing method, in the case of using a solid foam polyvinyl chloride (PolyVinyl Chloride (PVC), Polyethylene terephthalate (PET) or the like, urethane foaming agents, silicone foaming agents, etc., in the case of using a spray-type foam, expanded polypropylene (EPP), foamed polyethylene in the case of using a pellet-type foam Expanded PolyEthylene (EPE), Expanded PolyStylene (EPS) and the like are used.

As such, the support bar according to the present invention serves as a reinforcing material to structurally increase the rigidity of the hollow body portion 100 by filling the foam 150 therein, through which the wall surface of the body portion 100 At the same time, the thickness of the body portion 100 may be reduced, and sufficient rigidity may be guaranteed even when the material of the body part 100 is not an expensive and high rigidity material. In addition, the inside of the support bar is filled to fill the foam 150 to seal the insert insertion hole 110, the sealing plug insertion hole 120, and the tip insertion hole 130, which are passages connecting the inside and the outside of the support bar, to the outside. When used in a flat panel display manufacturing process, since it acts as a sealing body, air cannot be introduced into the inside or filled with water during cleaning, and cracks may occur in the body part 100 due to internal air expansion during drying after cleaning. In addition to the risk of damage such as the like, it is possible to prevent the water leaking from the inside in the process of loading the substrate after cleaning to cause the failure of the substrate in advance.

In addition, even under repeated loads of loading and unloading the substrate for a long time, the load applied to the upper surface of the support bar in direct contact with the substrate is distributed through the foam 150 filled therein, evenly to the front of the support bar. Because of the distribution, fatigue failure due to local stress fluctuation can be suppressed.

Hereinafter, a method of manufacturing the support bar configured as described above will be described in detail.

5 is a flowchart illustrating a manufacturing process of a support bar for a substrate loading cassette according to a first embodiment of the present invention.

In the method for manufacturing a support bar according to the first embodiment of the present invention, the body material of the support bar is laminated on the surface of the foam processed into the inner mold shape, and then heated and molded into the outer mold, and only the outer mold is removed. As a method of manufacturing a support bar in which foam is finally filled therein, a detailed process thereof will be described with reference to FIG. 5.

First, after processing the solid foam into the internal mold shape, that is, the hollow shape inside the body of the support bar to be processed (S110), the body material, for example, the above-described CFRP is laminated on the surface of the processed foam (S120). Here, the solid foam serves as a normal internal mold in the subsequent heat molding process, the material is PVC, PET and the like described above, the internal shape of the hollow support bar to be processed solid foam By cutting and processing the same as in the subsequent molding process to serve as an internal mold for forming the body portion. Therefore, it is preferable that the material of a solid foam selects the material which satisfy | fills heat resistance which can fully endure the heating temperature in a subsequent shaping | molding process among the material of the same component. In addition, in the step S120, it is possible to form a CRFP body material on the surface of the foam by the method of winding the fabric made of carbon fiber to a predetermined thickness on the surface of the processed foam and then impregnated with epoxy resin to cure. .

Subsequently, after the release film is laminated again on the foam on which the body material is laminated (S125), the foam on which the material stacking is completed is put into an external mold to prepare for molding (S130). Here, the release film not only improves the releasability between the mold and the molded product in the subsequent external mold demoulding process, but also closely wraps the body material stacked on the foam to form a good surface state of the body part in the molding process. Do it.

Subsequently, an external mold into which the foam on which the material stacking is completed is put is put into a molding equipment such as an autoclave, an oven, a press, and the like, and is heated in a temperature range of 80 ° C. to 160 ° C. By performing, to form a molded body formed integrally inside the body processed in the mold shape (S140). Here, the molding time depends on the molding temperature. In general, the molding cycle of the laminated material has a longer molding time as the molding temperature is lower, and conversely, the higher the molding temperature, the shorter the molding time is required. In addition, the optimum molding temperature is determined by the heat resistance of the foam material used and the molding cycle of the laminated material.

After the molding process (S140) is completed, the molded body is demolded outside the mold (S150), and proceeds directly to the additional processing step (S160) without demolding the inner mold, in the additional processing step (S160) to the purpose of using the support bar. Machining such as length cutting, tip inserting, insert inserting, sealing plug inserting, etc., is carried out to fit.

After the additional processing process (S160) is completed, the product is cleaned and dried to perform the assembly process of assembling inserts such as inserts, sealing plugs, tips, etc. to complete the support bar manufacturing process (S170), and the finished product A leak test is performed to check whether the inside of the support bar is completely sealed from the outside (S180).

6 is a flowchart illustrating a manufacturing process of a support bar for a substrate loading cassette according to a second embodiment of the present invention.

Unlike the first embodiment described above, the method for manufacturing the support bar according to the second embodiment of the present invention prepares a hollow body part of the support bar by preparing a separate internal mold and forms a foam in the body part of the completed support bar. As a method of filling, the detailed manufacturing process will be described with reference to FIG.

First, prepare a separate inner mold for forming a hollow part in the body of the support bar to be processed (S210), and stacks the body material on the prepared inner mold surface (S220).

After the body material stacking process (S220), processes S225 to S250 are the same as the processes S125 to S150 of the first embodiment, and thus a detailed description thereof will be omitted.

When the external mold demolding is completed from the molded body in which the molding is completed in the S250 process, the internal mold is subsequently demolded (S255), and the foam is filled in the inside of the molded body in which the internal mold is located (S260). Here, the foam filling process (S260) is a method of filling the inside of the body portion by the foam that is foamed at the same time by spraying the spray-type foam, such as urethane foaming agent, silicone foaming agent into the body portion, pellets such as EPP, EPE, EPS By inserting a predetermined amount of heat into the interior of the body portion, two methods may be used in which the inserted pellets, ie, the pellets, are filled by the heat and fill the interior of the body portion.

After the foam filling process (S260) is completed, an additional machining process (S270), an insertion part assembly process (S280), and a leak test (S290) are performed, and these processes are the corresponding processes S160 and S170 of the above-described first embodiment. And S180, respectively.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

1 is a perspective view showing the entire structure of a conventional substrate loading cassette.

Figure 2 is a side cross-sectional view of the support bar shown in FIG.

Figure 3 is an exploded perspective view showing a structure in which various components are coupled to the support bar for a substrate loading cassette according to an embodiment of the present invention.

Figure 4 is a side cross-sectional view of the support bar shown in FIG.

5 is a flowchart illustrating a manufacturing process of a support bar for a substrate loading cassette according to a first embodiment of the present invention.

6 is a flowchart illustrating a manufacturing process of a support bar for a substrate loading cassette according to a second embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

5 substrate 10 top plate

20: lower plate 30: vertical column

31: substrate receiving 40: support

50: support bar 51, 110: insert insertion hole

52, 120: sealing plug insertion hole 53, 130: tip insertion hole

61, 210: Insert 62, 220: Sealing stopper

63, 230: tip 100: body

150: foam

Claims (8)

In the support bar which is installed at a predetermined interval to the support plate connecting the upper plate and the lower plate of the substrate stacking cassette to support the substrate, It consists of a hollow columnar body, The support bar for a substrate loading cassette, characterized in that the inside of the body is filled with a foam (foam). The method of claim 1, The body of the support bar, Support bar for substrate loading cassette, characterized in that made of Carbon Fiber Reinforced Plastics (CFRP). The method of claim 1, The body of the support bar, A support bar for a substrate loading cassette, comprising a material composed of a mixture of fiber glass reinforced plastic (GFRP) or aramid fiber in carbon fiber reinforced resin. The method of claim 2 or 3, As the carbon fiber reinforced resin, Carbon fibers having an elastic modulus of 23 to 25 ton / mm ² are used, or carbon fibers having an elastic modulus of 23 to 25 ton / mm ² and carbon fibers having an elastic modulus of 64 to 66 ton / mm ² are used. Support bar for substrate loading cassette, characterized in that. The method of claim 1, The material of the foam, PolyVinyl Chloride (PVC), PolyEthylen Terephthalate (PET), Urethane Foaming Agent, Silicone Foaming Agent, Expanded PolyPropylene (EPP), Expanded PolyEthylene (EPE) and Expanded PolyStylene A support bar for a substrate stacking cassette, characterized in that any one selected from the group consisting of EPS). In the method for manufacturing a support bar that is provided at a predetermined interval to the support plate connecting the upper plate and the lower plate of the substrate stacking cassette to support the substrate, Processing the solid foam into a hollow portion inside the body of the support bar to be processed; Laminating Carbon Fiber Reinforced Plastics (CFRP) on the surface of the processed foam; Preparing a molded body in which a foam processed into the inner mold shape is integrally formed inside the body by inserting the carbon fiber reinforced resin into the outer mold and then performing a heat molding process; Demolding the outer mold from the molded body when the heat forming process is completed; Length-cutting and machining the molded body from which the external mold is demolded; Method of manufacturing a support bar for a substrate stacking cassette, characterized in that comprises a. In the method for manufacturing a support bar that is provided at a predetermined interval to the support plate connecting the upper plate and the lower plate of the substrate stacking cassette to support the substrate, Preparing an inner mold for molding the hollow part in the body of the support bar to be processed, and laminating carbon fiber reinforced resin on the inner mold surface; Manufacturing a molded body having a hollow part formed therein by inserting the inner mold in which the carbon fiber reinforced resin is stacked into an outer mold and performing a heat molding process; When the heat forming process is completed, demolding the outer mold and the inner mold, and filling a foam into the molded body in which the inner mold is placed; Length cutting and machining the molded body filled with the foam; Method of manufacturing a support bar for a substrate stacking cassette, characterized in that comprises a. The method according to claim 6 or 7, In the step of performing the heat forming process, A method of manufacturing a support bar for a substrate loading cassette, characterized in that the heat forming is performed within a temperature range of 80 ° C to 160 ° C.

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