JP4474401B2 - Glass substrate transfer tray - Google Patents

Description

  The present invention relates to a glass substrate transfer tray, and more particularly to a flat-type glass substrate transfer tray formed of a polyolefin resin foam.

  For transporting glass substrates (including finished panels) between glass manufacturers, color filter manufacturers, and device manufacturers, with bottomed main body and lid, or bottomless main body, lid and bottom Each of these members is made of a polyolefin resin foam, and a glass substrate transport box in which grooves for supporting a substrate are formed on a pair of opposing surfaces of the inner surface of the main body. It has been proposed (Japanese Patent Laid-Open Nos. 7-132986 and 8-301354).

  The box-type transport container is relatively excellent in protecting the glass substrate. However, since the glass substrate is accommodated vertically, only one end surface of the glass substrate is in contact with the bottom portion of the box, so the area receiving the load of the glass substrate is small, and the load of the glass substrate is concentrated on the bottom portion of the box. Easy to deform. When the deformation of the box increases, the gap between the glass substrate and the inner wall surface of the box that supports the glass substrate increases, and the glass substrate easily vibrates up and down in the box during transportation. If it does so, there exists a malfunction that a glass substrate breaks or a glass substrate scrapes the inner wall surface of a box and a lot of dust generate | occur | produces. When the generated dust adheres to the glass substrate, it is necessary to separately remove the dust adhering from the glass substrate at the transport destination. Therefore, a glass substrate transport tray that does not generate dust during transportation is desired.

  An object of the present invention is to solve the above-described problems, that is, to provide a glass substrate carrying tray that is less likely to be deformed by a load of the glass substrate and that is less likely to generate dust due to vibration of the glass substrate during transportation. .

  Another object of the present invention is to provide a glass substrate carrying tray that is less susceptible to vibration of the glass substrate during transportation.

As means for solving the above problems,
Claim 1 is a glass substrate transport tray made of a polyolefin resin foam in which a plurality of storage portions for horizontally storing glass substrates are formed on the upper surface of the tray, and the storage portion of the tray is a glass substrate Has a bottom surface and a side wall that surrounds the bottom surface, has a recess on the periphery of the bottom surface, and is a flange formed on the outer periphery of the outermost side wall among the side walls and at a position lower than the side wall And a side wall located on the outermost side among the side walls of the lower glass substrate transport tray when one glass substrate transport tray is overlapped with the other glass substrate transport tray. A rib portion formed so as to enter an L-shaped space formed by the flange portion, and one of each of the two sets of side walls facing each other in the storage portion. Alternatively, in the two sets of side walls, the side wall located between the adjacent storage parts in the plurality of storage parts is provided with a recess in the central portion of the upper surface, and is located on the outermost side among the side walls in the plurality of storage parts. In the side wall, it is a central part of the side wall, and a concave portion is provided along the inner surface of the side wall.
According to a second aspect of the present invention, the concave portion provided along the inner surface of the side wall is formed at a portion where the concave portion provided in the central portion of the upper surface of the side wall located on the outermost side is formed. 1 is a tray for conveying a glass substrate according to 1.

The glass substrate transport tray of the present invention is formed on the outer periphery of the outermost side wall and at a flange portion formed at a position lower than the side wall, and on the back surface of the tray. When the glass substrate transport tray is overlaid, it is formed so as to enter the L-shaped space formed by the outermost side wall and the flange portion among the side walls of the lower glass substrate transport tray. By having the protruding portion, when the trays are used in an overlapping manner, the horizontal displacement between the trays can be prevented.
Furthermore, the tray for conveying a glass substrate of the present invention has a recess formed at the peripheral edge on the bottom surface, a recess formed in the central portion of the upper surface of the side wall located between adjacent storage portions in the plurality of storage portions, and the outermost side. The side wall is located at the center and has a recess formed along the inner surface of the side wall, so that the container is not easily deformed by the load of the glass substrate, and the dust caused by scraping the glass substrate transport tray. The occurrence of spilling can be reduced, and a part of the side wall is left outside the side wall, so that the strength of the side wall can be reduced. It is possible to prevent dust, dust, etc. from entering the storage unit from the inside.

  1 and 2 will be described in detail using an example of a glass substrate transport tray as a reference example of the present invention. FIG. 1 shows an example of a storage portion of a glass substrate transfer tray 11 as a reference example and a flat-stacked glass substrate transfer tray 1 (hereinafter referred to as a reference comparison tray 1) as a reference comparative example to be compared with it. An example of the storage section of the “call”) is shown. In FIG. 2, the storage portion of the reference comparison tray 1 and the storage portion of the glass substrate transport tray 11 as a reference example are cut along lines AA and BB, respectively, and viewed from the front to the back of the figure. FIG. The storage portion of the glass substrate transport tray 11 is formed by the bottom surface 12 and the side wall 15. A groove-like recess 13 parallel to the side is formed on a part of the peripheral edge of the bottom surface 12, and a fan-shaped recess 14 is formed at the peripheral corner of the bottom surface 12. A concave portion 16 lower than the height of the upper surface is formed in the central portion of the upper surface of the side wall 15. In one of the side walls 15, a concave portion 17 is formed on the inner wall surface of the side wall at a location where the concave portion 16 is formed. Further, the inner wall surface of the side wall 15 is not perpendicular to the bottom surface 12 but has an upwardly spread inclination as shown in FIG.

  The storage portion of the reference comparison tray 1 has a flat bottom surface 2 and a side wall 3 having a flat top. Therefore, when the glass substrate 4 is placed flat on the reference comparison tray 1, when the glass substrate vibrates up and down during transportation, the corner 4a, the end surface 4b, the end surface corners 4c and 4c ′ of the glass substrate 4 are The side wall 3 is repeatedly separated and contacted, and the reference comparison tray 1 at a location shown in black in FIG. 2 is scraped to generate dust. In particular, in the side wall 3, the upper part of the inner wall surface of the glass substrate 4 in contact with the end surface corner 4c and the lower part of the inner wall surface of the glass substrate 4 in contact with the end surface corner 4c 'are particularly shaved. On the bottom surface 2, the vicinity of the peripheral edge of the bottom surface where the end surface corner 4 c ′ of the glass substrate 4 is in contact and the peripheral corner of the bottom surface 2 where the corner 4 a of the glass substrate 4 is in contact are scraped to generate dust.

  On the other hand, in the case of the glass substrate carrying tray 11 shown in FIG. 1, a groove-like recess 13 parallel to the peripheral edge and a fan-shaped recess 14 are formed in advance at the peripheral edge of the bottom surface 12. Therefore, even if the glass substrate 4 placed flat vibrates up and down, the corners 4a and the end surface corners 4c ′ of the glass substrate 4 do not contact the bottom surface 12, and the bottom surface 12 portion is not scraped. The bottom surface 12 has a sufficient area in contact with the glass substrate 4 even if the groove-shaped recess 13 and the fan-shaped recess 14 are formed. Therefore, the bottom surface 12 is made of glass like a conventional box-type transport container. The glass substrate transport tray 11 is not deformed by the load of the substrate 4. In addition, since the inner wall surface of the side wall 15 has an outward inclination in advance, the upper part of the inner wall surface of the side wall 15 is in contact with the end surface corner 4c and the end surface 4b of the glass substrate 4 even when the glass substrate 4 vibrates up and down. It is difficult to do so, and the glass substrate transport tray 11 in that portion is not scraped or very little. Furthermore, since the concave portion 16 provided on the upper surface of the side wall 15 and the concave portion 17 provided on the inner wall surface thereof, the area where the side wall 15 contacts the end face corners 4c, 4c ′ and the end face 4b of the glass substrate 4 is reduced. The side wall 15 portion is difficult to be cut. Therefore, when the recessed part 13, the recessed part 14, the recessed part 16, and the recessed part 17 are provided, the tray 11 for glass substrate conveyance has the effect | action which reduces generation | occurrence | production of dust.

  When the concave portion 17 is not formed at the location where the concave portion 16 is formed, the lower surface of the concave portion 16 is lower than the end surface corner portion 4c (the upper corner portion of the end surface) of the glass substrate 4 stored in the storage portion. However, it is preferably the same as the end face corner 4c ′ (the bottom corner of the end face) of the glass substrate 4 and may be located below the end face corner 4c ′ of the glass substrate 4. More preferred. In this case, the lower the lower surface of the concave portion 16 is located, the smaller the number of places that come into contact with the end surface 4b of the glass substrate 4 accommodated, so that the generation of dust is drastically reduced. In addition, it is preferable that the recessed part 16 does not penetrate the bottom of the tray for glass substrate conveyance. When the concave portion 16 penetrates the bottom of the glass substrate transport tray, when dust is generated, the dust falls on the glass substrate housed in the lower glass substrate transport tray through the through hole, and the dust adheres. Is not preferable because it can occur.

  On the other hand, the recess 17 is provided at a position that coincides with at least a part of the end surface 4b of the glass substrate 4 stored in the storage portion, regardless of whether the recess 16 exists, It is preferable to be provided at a position that completely coincides, and furthermore, the lower end of the concave portion 17 is located below the end surface corner portion 4c ′ of the glass substrate 4 or / and the upper end of the concave portion 17 is of the glass substrate 4. It is preferable to be positioned above the end face corner 4c. As the width of the concave portion 17 in the vertical direction increases, the number of portions that come into contact with the end surface 4b, the end surface corner portion 4c, and the end surface corner portion 4c 'of the glass substrate 4 accommodated decreases, so the generation of dust is drastically reduced. It should be noted that the upper end of the concave portion 17 is usually set to a height that coincides with the lower surface of the concave portion 16 when it is provided at a location where the concave portion 16 exists, and at the location where the concave portion 16 does not exist. When provided, the height is made to coincide with the upper surface of the side wall 15. In this case, the recess 17 is in a state in which the side wall 15 is cut out toward the upper surface, and strictly speaking, the recess 17 has no upper end. In this state, the concave portion 17 can be easily formed.

  Further, in the concave portion 16 or the concave portion 17 provided on the side wall 15, when the glass substrate 4 is accommodated in the accommodating portion of the glass substrate carrying tray 11 or when the glass substrate 4 is taken out from the accommodating portion, a human finger or machine This makes it difficult for the gripping device to be caught on the side wall 15, so that the glass substrate 4 can be easily housed and taken out from the glass substrate transport tray 11.

  The glass substrate carrying tray of the present invention is made of a polyolefin resin foam. The expansion ratio of the polyolefin resin foam (the density of the base resin / the apparent density of the foam) is the type of the polyolefin resin as the base resin, the size and weight of the substrate to be stored, and the glass substrate transport tray. Although it is determined according to the thickness of the side wall and the bottom surface, it is usually 3 to 60 times, preferably 4 to 50 times. If the expansion ratio is too small, the glass substrate is easily broken, and the lightness of the glass substrate carrying tray is likely to be hindered. Also, if the expansion ratio becomes too large, the strength tends to be insufficient, so the wall thickness must be increased to compensate for this, resulting in a large glass substrate transport tray with an unnecessarily thick wall thickness. There is a risk that.

The polyolefin resin referred to in the present invention corresponds to any of the following (a) to (e).
(A) A homopolymer of an α-olefin such as ethylene, propylene, and butene.
(B) A copolymer of two or more α-olefins.
(C) a copolymer comprising an α-olefin component and another monomer component, and the α-olefin unit component ratio is 50% by weight or more, preferably 60% by weight or more, more preferably 70% by weight or more; Preferably 80% by weight or more, most preferably 90% by weight or more of the copolymer.
(D) A mixture of two or more selected from the group of (a), (b) and (c) above.
(E) one or more selected from the group (a), (b), (c), and (d) above, and the above (a), (b), (c), or (d ) And other synthetic resin components or / and mixed resin compositions with other synthetic elastomer components, wherein the α-olefin component unit ratio in the composition is 50% by weight or more, preferably 60% by weight or more. More preferably, the mixed resin composition is 70% by weight or more, more preferably 80% by weight or more, and most preferably 90% by weight or more.

The polyolefin resin foam constituting the glass substrate carrying tray of the present invention is preferably made of polypropylene resin among the polyolefin resins. Since what consists of polypropylene resin is excellent in intensity | strength, the same intensity | strength can be implement | achieved more lightweight compared with what consists of polyethylene resin, for example. The polypropylene resin corresponds to any of the following (f) to (i).
(F) A propylene homopolymer.
(G) A copolymer comprising a propylene component and another monomer component, and the propylene unit component ratio is 50% by weight or more, preferably 60% by weight or more, more preferably 70% by weight or more, and further preferably 80% by weight. % Or more, most preferably 90% by weight or more of a copolymer.
(H) A mixture of two or more selected from the group of (f) and (g) above.
(I) One or more selected from the group of (f), (g), and (h) above, and another synthetic resin different from the above (f), (g), or (h) Component or / and mixed resin composition with other synthetic elastomer component, wherein the propylene component unit ratio in the composition is 50% by weight or more, preferably 60% by weight or more, more preferably 70% by weight or more, The mixed resin composition is preferably 80% by weight or more, and most preferably 90% by weight or more.

  Add necessary amounts of various additives such as antistatic agents, bubble regulators, flame retardants, flame retardant aids, inorganic fillers to the polyolefin resin constituting the polyolefin resin foam as required. Can do.

  The polyolefin resin foam in the present invention is preferably a molding method, so-called mold, in which foamed particles obtained by foaming a polyolefin resin into beads are filled in a mold, heated to a predetermined temperature, and then cooled. Manufactured by an internal molding method. Since the in-mold molding method can be performed at a lower pressure than the injection foam molding method, a low-cost mold such as an aluminum mold can be used as the mold. The in-mold molding method is preferable because it can be made in a more complicated shape than the method of thermoforming an extruded foam and a thick product can be easily obtained.

  FIG. 3 shows a modified example of the bottom surface 12 that can be an embodiment of the present invention in the storage portion of the glass substrate transport tray 11. Each figure in FIG. 3 is a plan view, and side walls are omitted. The portion displayed with a polka dot pattern in the figure is lower than the bottom surface 12. In the examples of 3-1 and 3-2 in the drawing, a groove-like recess 13 is provided on each of the two peripheral pairs on the bottom surface 12 and facing each other. By providing the groove-shaped recess 13, the end surface corner 4 c ′ of the glass substrate is less likely to contact the bottom surface 12. The width and depth of each groove-shaped recess are not particularly limited, and the width and depth may be the same or different for each side. Moreover, the groove-shaped recessed part may be provided only in any one side. In the example shown in 3-3, a concave portion 14 having a fan-shaped planar shape is provided at a peripheral corner portion of the bottom surface 12. Providing the recess 14 makes it difficult for the lower end of the corner 4a of the glass substrate to contact the peripheral corner of the bottom surface 12 and the vicinity of the peripheral corner. There are no particular restrictions on the planar shape and area of the concave portion at the peripheral corner, and the concave portion can employ various planar shapes such as a triangle, a quadrangle, and a polygon. The examples of 3-4, 3-5, 3-6, and 3-7 in the figure combine either the groove-shaped recess 13 and the recess 14 at the peripheral corner shown in the examples of 3-1 to 3-3. It is an example. 3-7 is an example in which the groove-shaped recess 13 and the planar recess 14 in which the hypotenuse of the right triangle is replaced with an arc are combined, and as a result, the bottom surface 12 is elliptical.

  The aspect shown above, that is, by providing a recess in the bottom surface portion in contact with the corner portion and the end surface corner portion of the glass substrate, the contact with the sharp lower end 4c ′ in the end surface 4b of the glass substrate 4 is reduced, Or a contact area can be made small, As a result, generation | occurrence | production of the dust by the scraping of the tray surface for glass substrate conveyance can be reduced sharply. In particular, if the bottom surface is designed so that the lower end of the corner 4a of the glass substrate does not come into contact with the bottom surface 12 by providing the concave portion 14 at the peripheral corner portion of the bottom surface 12, it further contributes to the drastic reduction of dust generation.

  4-1 to 4-3 in FIG. 4 show a modified example of the concave portion 17 formed on the inner wall surface of the side wall 15 of the substrate carrying tray 11 which can be taken as an aspect of the present invention. Each figure of 4-1 to 4-3 in FIG. 4 is a top view. 4-1 and 4-2 in FIG. 4 are center portions of a pair of side walls, respectively, of two sets of side walls facing each other in the storage portion, and a state in which a recess is provided along the inner wall surface of the side walls. FIG. The part displayed with a polka dot pattern in the figure indicates that it is recessed compared to the inner wall surface of the side wall 15. In the example shown in 4-1 and 4-2 in FIG. 4, the recess 17 along the inner wall surface of the side wall 15 is a central portion of one side wall among the two sets of side walls facing each other in the storage unit. Is provided. Since a part of the side wall remains on the outer side of the concave portion 17, the concave portion 17 is excellent in that the strength reduction of the side wall due to the provision of the concave portion 17 is small. The concave portion 17 provided in the central portion of the side wall prevents a finger holding the glass substrate 4 or a gripping device by a machine from hitting the side wall 15 and makes it easier to accommodate the glass substrate 4 in the storage unit. Therefore, as shown in FIG. 4, it is preferable to be provided on two opposing side walls 15, but it may be provided on only one of the side walls. The depth of the recess with respect to the height of the side wall 15, the thickness of the recess with respect to the wall thickness of the side wall, the width of the recess, and the planar shape of the recess are not particularly limited and can be appropriately selected. Further, in the glass substrate transport tray provided with a plurality of storage units, the concave portion 17 is provided in a portion that contacts the outer peripheral wall of the glass substrate transport tray, thereby preventing dust, dust, etc. from entering the storage unit from the outside. Also plays a role. Further, the recess 17 has a role of reducing the area where the side wall 15 is in contact with the end surface 4b and the end surface corners 4c, 4c 'of the glass substrate 4 and reducing the scraping of the inner wall surface of the side wall 15.

  In the example shown by 4-3 in FIG. 4, a recess 18 is provided along the inner wall surface of the side wall 15 at the corner of the side wall 15 that is the intersection of the two side walls 15. Providing the recesses 18 at the corners of the side walls 15 makes it difficult for the corners 4a of the glass substrate to come into contact with the vicinity of the corners of the side walls 15, thereby preventing the generation of dust due to scraping of the side walls 15. As shown in 4-3 of FIG. 4, it is preferable that the recess 18 is provided at the corner of the inner wall surface of all the side walls in one storage part, but for the purpose of maintaining the strength of the side wall, The recessed part 18 may be provided only in some.

  4-4 to 4-6 in FIG. 4 show modifications of the recess 16 formed on the upper surface of the side wall 15 of the substrate carrying tray 11 that can be taken as an aspect of the present invention. 4-4 to 4-6 in FIG. 4 are plan views. The portion displayed with a polka dot pattern in the figure is lower than the upper surface of the side wall 15.

  In the example shown in 4-4 and 4-5 of FIG. 4, the recessed part 16 is provided in the upper surface center part of one side wall among each of two sets of side walls which oppose in a storage part. Since the recess 16 completely divides the central portion of the upper surface of the side wall 15, it prevents the fingers having the glass substrate 4 over the recess 17 and the gripping device by the machine from hitting the side wall 15 and accommodates the glass substrate 4 in the storage unit. Make it easier to do. The recess 16 may be provided on only one of the side walls, or one of the recesses 16 provided on the opposite side wall may be used as the recess 17, or the recess 16 and the recess 17 may be provided on one side wall. You may combine. The depth and width of the recess 16 are not particularly limited. However, the depth and the depth reaching the bottom surface 12 or the depth reaching the groove-like recess 13 provided on the bottom surface 12 are preferable, so that a human finger is not caught. It preferably has a width. In the example shown by 4-6 in FIG. 4, the concave portions 16 are provided in all the side walls 15. In this case, the glass substrate 4 can be accommodated from either the vertical direction or the horizontal direction in FIG. Moreover, the recessed part 16, the recessed part 17, and the recessed part 18 which were shown to the example of 4-1 to 4-6 shown in FIG. 4 can also be provided combining in one accommodating part. Further, the example of the side wall 15 shown in FIG. 4 and the example of the bottom surface 12 shown in FIG. 3 may be provided in combination. In FIG. 4, a bottom surface 12 that does not have a recess on the periphery and a side wall 15 that surrounds the bottom surface 12 are shown.

  FIG. 5 shows a modification of the cross-sectional shape of the side wall 15 in the storage portion of the substrate carrying tray 11 that can be taken as an aspect of the present invention. In the examples shown in 5-1 to 5-5, all or part of the cross-sectional shape of the side wall 15 has a tapered shape. The example of 5-1 has a taper shape in which the side wall 15 spreads upward. By doing so, the end face corner portion 4c 'of the glass substrate does not contact the lower portion of the inner wall surface of the side wall 15, so that this portion can be prevented from being cut. In the example of 5-2, the side wall 15 has a rhombus shape that is a combination of an upwardly tapered shape and a downwardly tapered shape, so that the corners 4c and 4c ′ of the glass substrate are respectively the upper part of the inner wall surface of the side wall 15 and Since it is no longer in contact with the lower part, it is preferable because this part can be prevented from being cut. 5-3 is the taper shape of the downward spread shown in FIG. In 5-4 and 5-5, a part of the side wall 15 has a tapered shape. In the examples of 5-6 to 5-8, a wide projecting portion 19 is provided at any one of an upper portion, a central portion, and a lower portion of the cross section of the side wall 15. In 5-6, by providing the overhanging portion 19 at the center of the cross section of the side wall 15, the end surface corners 4c and 4c ′ of the glass substrate do not contact the upper and lower inner wall surfaces of the side wall 15 in the same manner as 5-2. It is preferable because this portion can be protected easily. There are no particular restrictions on the shape, width, position on the side wall, etc. of the overhang. The examples of 5-9 to 5-11 are examples in which the recess 20 is provided on the inner wall surface of any one of the upper part, the central part, and the lower part of the cross section of the side wall 15. In the case of 5-9, unlike the concave portion 17 in FIG. 4, the concave portion is provided not only in the central portion of the side wall but also in the entire inner wall surface of the upper side wall, or the concave portion 20 is provided without limiting the position on the inner wall surface of the upper side wall. It is done. Since the concave portion 20 also reduces the contact area between the glass substrate end surface 4b or the end surface corners 4c, 4c 'and the side wall 15, generation of dust due to the side wall 15 being scraped can be suppressed. Moreover, as shown in the example of 5-12, both wall surfaces of the side wall 15 do not need to have the same shape, For example, the overhang | projection part 19 can also be provided only in one inner wall surface. Similarly, only one inner wall surface side of the side wall 15 can be tapered or the recess 20 can be provided.

  By forming the side wall as described above, that is, by providing a concave portion at the center of the side wall or in contact with the corner and end face of the glass substrate, or on the side wall cross section in contact with the corner and end face corner of the glass substrate. By making the shape tapered, providing a protruding portion, or providing a recess, the contact area between the sharp end surface corners 4c, 4c ′ and the corner 4a of the glass substrate and the side wall 15 can be reduced. Generation of dust due to wall scraping can be drastically reduced. In particular, if the side wall is designed so that the corner 4a of the glass substrate does not contact the side wall, it contributes to the drastic reduction of dust generation.

  The storage part in the glass substrate carrying tray 11 of the present invention can be used by combining the side wall part 15 and the bottom face 12. Moreover, there is no restriction | limiting in particular also about the number of the accommodating parts in one tray 11, One may be sufficient and plural may be sufficient.

  When a plurality of glass substrate transport trays are stacked one above the other, the glass substrate transport tray of the present invention has a glass substrate transport tray positioned on the lower surface of the glass substrate transport tray positioned on the upper side. It is preferable that it is a shape in which the protrusion part which approachs a storage part is formed. When the glass substrate vibrates up and down during transportation of the glass substrate, and the vibration width is larger, the surface of the glass substrate carrying tray is scraped and dust is generated more. However, in the case of the glass substrate transport tray of this aspect, the vertical movement of the glass substrate during transportation of the glass substrate can be prevented as much as possible due to the presence of the protruding portion that enters the storage portion of the glass substrate transport tray. Therefore, the glass substrate transfer tray of this aspect can further reduce the dust generated by scraping the surface of the glass substrate transfer tray. 6 and 7 show an example in which a protruding portion 21 is formed on the lower surface of the glass substrate carrying tray 11 of the present invention. FIG. 6 is a rear view of a part of the glass substrate carrying tray 11 of the present invention. A flat circular protrusion 21 is provided on the flat surface 33 located on the back surface of the glass substrate transfer tray 11. The shape and size of the protruding portion 21 are not particularly limited as long as the protruding portion 21 can enter the storage portion of the glass substrate carrying tray 11. FIG. 7 is a view showing a state in which two glass substrate transport trays 11, 11 ′ are stacked vertically and the glass substrate 4 is accommodated.

  Usually, a plurality of glass substrate transfer trays 11 in which the glass substrates 4 are accommodated are stacked one above the other and tied as necessary to integrate the plurality of glass substrate transfer trays 11. At this time, the glass substrate is not accommodated in the uppermost glass substrate carrying tray and is used instead of the lid. Therefore, if an increase in the number of parts is allowed, the dedicated lid 22 shown in FIG. 8 can be used instead of the glass substrate transfer tray 11 as a substitute for the lid. The lower surface of the plate-like lid portion 23 of the dedicated lid 22 is placed on the lower side of the glass substrate carrying tray 11 when placed on the glass substrate carrying tray in the same manner as the back surface of the glass substrate carrying tray 11 described above. It is preferable to form a protruding portion 21 that enters the storage portion of the glass substrate to prevent vertical movement of the glass substrate as much as possible during transportation of the glass substrate.

  The storage part for storing the glass substrate formed in the glass substrate transport tray of the present invention may be one per one glass substrate transport tray, but two or more per one glass substrate transport tray You can also The number of storage units is determined by the relationship between the size of the glass substrate transfer tray and the size of the glass substrate to be stored. When a plurality of storage units are formed per glass substrate transport tray, a partition wall is formed between the storage units so that adjacent glass substrates do not come into contact with each other. In addition, the magnitude | size of each accommodating part is set so that there is some margin in the state which accommodated the glass substrate. 9 and 10 are a plan view and a back view of a glass substrate carrying tray having a plurality of storage portions.

  In the glass substrate carrying tray 11 of FIG. 9, a flange portion 31 is formed at the outer periphery of the side wall 15 ′ located on the outermost side among the side walls 15 and at a position lower than the side wall 15. On the other hand, on the back surface of the glass substrate transport tray 11 in FIG. 10, a protrusion 32 is formed around the flat surface 33 located on the back surface of the glass substrate transport tray so as to protrude downward from the flat surface 33. ing. The protrusion 32 enters an L-shaped space formed by the side wall 15 ′ and the flange portion 31 of the lower glass substrate transfer tray when the same glass substrate transfer tray is overlaid. . When the flange part 31 and the protrusion part 32 are formed in the glass substrate conveyance tray 11, since the shift | offset | difference of the horizontal direction of glass substrate conveyance trays can be prevented, it is preferable.

  It is desirable that the surface of the glass substrate carrying tray of the present invention has a skin structure that is denser than the inside of the glass substrate carrying tray. For example, at the time of in-mold forming, only the surface in contact with the inner surface of the mold can be formed into a dense skin structure by taking a long heating time or post-heating. In this case, the apparent density of the skin structure (the apparent density of the portion from the surface to a depth of 1 mm) is 1 more than the apparent density of the inside (the apparent density measured by cutting away the 1 mm depth from the surface). It is appropriate to increase it by 1 times or more, preferably 1.3 times or more, more preferably 1.5 to 3.5 times. A dense skin structure only on the surface is preferable because a light weight and high mechanical strength can be obtained, and generation of dust can be further prevented.

  The glass substrate that can be accommodated in the glass substrate carrying tray of the present invention includes various known glass substrates. For example, a glass substrate for a base plate, a glass substrate for a liquid crystal display, a glass substrate for a plasma display body, a glass substrate for a thermal head, various glass substrates such as a color filter, a TFT-formed glass substrate or a liquid crystal manufactured using these glass substrates A glass substrate such as a finished panel called a cell is included. It is preferable that the protective film which can be peeled by hand is laminated | stacked on both surfaces of these glass substrates.

When a TFT (thin film transistor) -formed glass substrate or a liquid crystal cell complete panel or a glass substrate with a protective film laminated on the surface thereof is stored, the glass substrate carrying tray of the present invention (another lid) (Including the lid when it is present) is preferably formed from a polyolefin resin foam having a volume resistivity of 10 ³ to 10 ¹² Ω · cm. Such a volume specific resistance value can be achieved by incorporating a conductive polymer or an antistatic substance into the polyolefin resin constituting the polyolefin resin foam by several% to several tens%.

  The glass substrate transfer tray of the present invention has a storage portion for horizontally storing the glass substrate on the upper surface thereof. And this storage part is formed from a side wall and a bottom, and if a concave part is formed in the peripheral edge in the bottom as a suitable mode, since this glass substrate conveyance tray supports a glass substrate by the bottom, The load is not concentrated on a part of the glass substrate, and the deformation of the tray is prevented as much as possible. As a result, the breakage of the glass substrate can be prevented as much as possible. In addition, since the sharp end face corner which is the cut surface of the glass substrate and the bottom surface of the tray are difficult to contact or do not contact, generation of dust due to scraping of the tray can be drastically reduced or prevented. In addition, some of the aspects formed by forming recesses on the peripheral edge of the bottom surface are shown in FIG.

  The glass substrate transfer tray of the present invention has a storage portion for horizontally storing the glass substrate on the upper surface thereof. And this storage part is formed from the side wall and the bottom face, and has a recessed part in the said side wall upper surface. By having the above configuration, the tray for conveying a glass substrate according to the present invention can reduce the contact area between the sharp end face which is a cut surface of the glass substrate and the corner of the glass substrate and the inner wall surface of the side wall of the tray. Generation | occurrence | production of the dust by shaving can be reduced. In addition, since fingers and robot arms are less likely to be caught on the wall surface of the tray, it is possible to easily store and remove the glass substrate from the tray. FIG. 4 shows some of the modes in which the recesses are formed on the upper surface of the side wall.

  The glass substrate transfer tray of the present invention has a storage portion for horizontally storing the glass substrate on the upper surface thereof. And this storage part is formed from the side wall and the bottom face, and has a recessed part in the inner wall face of the side wall. By having the above configuration, the glass substrate carrying tray of the present invention can reduce the contact area between the sharp end surface, which is the cut surface of the glass substrate, or the corner of the glass substrate and the side wall of the tray, so that the tray can be scraped. The generation of dust due to this can be reduced.

  The glass substrate carrying tray according to the present invention has, as a preferred mode, a protruding portion that enters the storage portion of the tray positioned on the lower side is formed on the lower surface of the tray positioned on the upper side so that the tray can be stacked vertically. By doing so, it is possible to prevent the glass substrate from moving up and down as much as possible when the glass substrate is transported. Therefore, the glass substrate carrying tray of this aspect can further reduce dust generated by scraping the surface of the tray.

FIG. 1 is a diagram comparing a flat stack type tray as a reference comparative example and a glass substrate transport tray as a reference example. FIG. 2 is a cross-sectional view of FIG. FIG. 3 is a plan view showing a modification of the bottom surface of the glass substrate carrying tray. FIG. 4 is a plan view showing a modification of the side wall in the glass substrate carrying tray. FIG. 5 is a cross-sectional view showing a modification of the cross-sectional shape of the side wall in the glass substrate carrying tray. FIG. 6 is a rear view of the glass substrate carrying tray. FIG. 7 is a cross-sectional view of a state where glass substrate transport trays are stacked one above the other. FIG. 8 is a side view of a dedicated lid that can be used for a glass substrate carrying tray. FIG. 9 is a plan view of a glass substrate carrying tray having a plurality of accommodating portions. FIG. 10 is a rear view of a glass substrate carrying tray having a plurality of accommodating portions.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass substrate conveyance tray 2 Bottom surface 3 Side wall 4 Glass substrate 4a Corner | angular part 4b End surface 4c End surface corner | angular part 4c 'End surface corner | angular part 11 Glass substrate conveyance tray 12 Bottom surface 13 Recess 14 Recess 15 Side wall 15' Side wall 16 Recess 17 Recess 18 Recess 18 19 Overhang 20 Recess 21 Protrusion 22 Exclusive lid 23 Lid 31 Flange 32 Projection 33 Flat surface

Claims (2)

A glass substrate transport tray made of a polyolefin resin foam in which a plurality of storage portions for horizontally storing a glass substrate is formed on the upper surface of the tray,
The tray storage portion has a bottom surface in which the glass substrate is stored and a side wall that surrounds the bottom surface, and has a recess on the periphery of the bottom surface,
A flange portion formed on the outer periphery of the side wall located on the outermost side among the side walls and at a position lower than the side wall, and formed on the back surface of the tray, one glass substrate carrying tray being the other glass substrate carrying tray And a protruding portion formed so as to enter an L-shaped space formed by the outermost side wall and the flange portion among the side walls of the lower glass substrate carrying tray. And
Of the two sets of side walls facing each other in the storage section, one or two sets of side walls are each provided with a recess in the center portion of the upper surface of the side walls located between adjacent storage sections in the plurality of storage sections. The side wall located on the outermost side among the side walls in the plurality of storage portions is a central portion of the side wall, and a recess is provided along the inner surface of the side wall,
A tray for conveying a glass substrate.   The said recessed part provided along the inner surface of a side wall is formed in the location in which the recessed part provided in the upper surface center part of the side wall located in the outermost part was formed. Board transfer tray.

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