JP2005289679A - Jig for heat treatment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jig for heat treatment by which the infiltration of scraps of a spacer, a chip or the like into a gap between a plate glass and a setter during firing is prevented to eliminate the occurrence of scratch on the plate glass. <P>SOLUTION: The jig for the heat treatment is provided with the setter 10 having thermal expansion efficient equal to or below that of the plate glass to be placed and providing a nearly flat plate glass placing part on a plate glass placing surface and the spacers 20 for supporting the setter 10 provided in a plurality of stages to secure the space for placing the plate glass between each setter 10 and the difference of the thermal expansion coefficients between the setter and and plate glass is controlled to ≤10×10<SP>-7</SP>. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat treatment jig for placing a plate glass in a firing furnace, and more particularly to the properties and shape of the heat treatment jig.

  Thick film electrodes, phosphor layers, glass layers for covering electrodes and partition walls in a plasma display panel (PDP) or the like are formed on a glass substrate by screen printing or the like and then fired to form a finished product. As shown in FIGS. 10 (a) and 10 (b), a conventional heat treatment jig for placing a plate glass as such a glass substrate in a firing furnace is a substantially flat placement. The setter 10 having a portion, and a spacer 20 that supports the setter 10 in order to secure a space for placing the plate glass 30 between the setters 10 in a plurality of stages. Using this heat treatment jig, the glass plate 30 to be heat treated is placed on the placement portion of the setter 10, and the spacers 20, that is, the four spacers 20 are arranged near the four corners of the placement surface of the setter. . Further, another setter 10 is placed on these four spacers 20, and the plate glass 30 is placed on the placement portion of the other setter 10. Thereafter, the same operation is repeatedly assembled to a desired number of stages and carried into a firing furnace. After carrying in the firing furnace, firing is performed.

JP-A-2002-160931 discloses a jig for heat treatment for placing such a plate glass in a baking furnace. As shown in FIG. 11, the disclosed heat treatment jig has a setter 10 and a spacer 20 that are made of crystallized glass having a thermal expansion coefficient of 15 × 10 −7 / ° C. or less and are assembled in multiple stages. The upper surface in the longitudinal direction of the spacer 20 interposed between the lower setters 10 is configured to support the upper setter 10 by being in surface contact with both end portions of the parallel sides of the lower surface of the upper setter 10. According to this configuration, even if the setter 10 and the spacer 20 are made of crystallized glass having a thermal expansion coefficient of 15 × 10 −7 / ° C. or less, the setter 10 and the spacer 20 are thermally deformed even when exposed to a high temperature in the baking furnace. In addition, the upper surface of the spacer 20 interposed between the upper and lower setters 10 is in contact with both ends of the parallel sides of the lower surface of the upper setter 10 to support the upper setter 10. The flatness of the setter 10 in the upper stage can be maintained.
JP 2002-160931 A

  However, in the conventional heat treatment jig, when the setters 10 before firing are stacked in a plurality of stages via the spacers 20 and transferred to the firing furnace, the glass spacers 20 that support the setters 10 are supported. A force is locally applied, and the spacer 20 may be chipped to generate a chip. The chip (glass chip) is moved by the air in the baking furnace. On the other hand, at the time of firing, the plate glass warps in the upper surface direction due to the temperature difference between the upper and lower surfaces of the plate glass, and a space is formed between the plate glass 30 and the setter 10. If chips or other scraps that can be moved by the air enter the gap space, the setter with a low coefficient of thermal expansion will be warped at a high temperature, or there will be no temperature difference inside the plate glass and the warping will be reduced. Since the space is converged between the plate glass 30 and the setter 10 and the chip is sandwiched between the plate glass 30 and the setter 10, the setter 10 hardly expands or contracts due to the expansion / contraction difference between the setter 10 and the plate glass 30. Thus, the sheet glass 30 has a problem of causing scratches due to the scrap when the glass sheet 30 extends and contracts.

  Accordingly, the present invention has been made to solve the above-described problems, and appropriately placing the plate glass during firing without creating scratches caused by spacer chips and other scraps entering the gap between the plate glass and the setter. An object is to provide a jig for heat treatment.

  A jig for heat treatment according to the present invention has a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of a plate glass to be placed, and a plurality of setters having a substantially flat plate glass placement portion on the plate glass placement surface. A spacer for supporting the setter to secure a space for placing the plate glass between the setters as a step, and the difference between the coefficient of thermal expansion of the setter and the plate glass to be placed is 10 × 10 − 7 or less. As described above, in the present invention, since the thermal expansion coefficient of the setter and the thermal expansion coefficient of the plate glass to be placed are substantially the same, when the plate glass is fired, the temperature distribution in the plate glass is different and warpage occurs. Since the setter having the same thermal expansion coefficient corresponding to this warpage also causes the same warp and firing is completed while maintaining adhesion, the separation between the plate glass and the setter due to the warpage of the plate glass does not spread so much, and the spacer Even if such a chip is generated and moved by firing with hot air, the possibility of the chip entering the space is extremely small, and damage to the plate glass can be prevented with a very high probability. Moreover, even if the spacer chip is mixed between the glass sheet and the setter, there is no difference in stretchability between the two members, so that the generation of scratches due to the stretch can be reduced.

  Moreover, the jig for heat treatment according to the present invention has a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of the plate glass to be placed, and a setter having a substantially flat plate glass placement portion on the plate glass placement surface, and the setter And a spacer for supporting the setter in order to secure a space for placing the glass plate between the setters, and the outer periphery of the setter and the periphery of the outer periphery are formed thin. As described above, in the present invention, since the outer periphery and the periphery of the outer periphery of the setter are formed thin, when the plate glass is fired, the temperature distribution in the plate glass is different at the beginning, and warpage occurs. Since the setter formed thinly around the periphery and the outer periphery also has the same warp and firing is completed while maintaining adhesion, the separation between the plate glass and the setter due to the warp of the plate glass does not spread so much, and a spacer chip is generated. Even if it moves during firing by hot air, the possibility that the chip enters the space is extremely small, and damage to the plate glass can be prevented with a very high probability.

  Moreover, the jig | tool for heat processing which concerns on this invention forms thinly the outer periphery and outer periphery periphery of the surface facing the plate glass mounting surface of the said setter as needed. As described above, in the present invention, the outer peripheral edge of the setter and the opposing surface of the inner mounting surface around the outer peripheral edge are formed thin, and the flatness of the plate glass mounting surface is maintained while making it difficult for the chip to enter the separated space. doing.

  Moreover, the jig | tool for heat processing which concerns on this invention forms thinly the outer periphery and outer periphery periphery of the plate glass mounting surface of the said setter as needed. As described above, in the present invention, when the outer peripheral edge of the setter and the inner mounting surface around the outer peripheral edge are formed thin, it is difficult to insert the chip into the separation space, and further, when the inclined surface is formed thin. Since the spacer chip rolls off from the setter mounting surface, the plate glass can be further prevented from being damaged.

  In addition, the jig for heat treatment according to the present invention has a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of the plate glass to be mounted, if necessary, and a setter having a substantially flat mounting portion on the plate glass mounting surface; A spacer for supporting the setter in order to secure a space for placing the plate glass between the setters in a plurality of stages, and on the outer peripheral edge of the setter and the surface facing the plate glass mounting surface around the outer peripheral edge. A plurality of dents are formed.

  Moreover, the jig for heat treatment according to the present invention has a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of the plate glass to be placed, and a setter having a substantially flat plate glass placement portion on the plate glass placement surface, and the setter And a spacer for supporting the setter in order to secure a space for placing the plate glass between the setters, and the plate glass placement portion of the setter comprises a recess capable of fitting the plate glass, and the depth of the recess Is formed to a depth that can accommodate the plate glass in a state of being warped due to thermal deformation. As described above, in the present invention, an indentable recess that can accommodate a sheet glass is formed. Therefore, when the sheet glass is baked in such a recess, the sheet glass is warped to form a gap space between the sheet glass and the mounting surface. However, the entrance for the spacer chip to enter the gap space is a small gap between the plate glass and the recess, and the chip cannot actually enter.

  Moreover, the jig for heat treatment according to the present invention has a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of the plate glass to be placed, and a setter having a substantially flat plate glass placement portion on the plate glass placement surface, and the setter And a spacer for supporting the setter to secure a space for placing the plate glass between the setters, and the space between the arrangement position of the spacer on the plate glass placement surface and the plate glass placement portion. A barrier having an L-shaped planar shape lower than the height of the spacer is provided. In this way, in the present invention, since a barrier having an L shape with a planar shape lower than the height of the spacer is formed between the spacer and the plate glass placement portion, the plate glass placement surface of the plate glass and setter during firing is formed. A barrier is formed to prevent the spacer chip from entering from the portion of the gap that becomes the largest gap, and the chip penetration into the gap space can be greatly reduced.

  Moreover, the jig for heat treatment according to the present invention has a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of the plate glass to be placed, and a setter having a substantially flat plate glass placement portion on the plate glass placement surface, and the setter And a spacer for supporting the setter to secure a space for placing the plate glass between the setters, and a shape surrounding the plate glass placement portion lower than the height of the spacer on the outer periphery of the plate glass placement portion. There is a barrier. As described above, in the present invention, by providing a barrier having a shape that continuously surrounds the mounting portion, a portion between a certain L-type barrier and another L-type barrier is not formed. Since the barrier is formed, the chip can be prevented from entering without the chip entering further.

  Moreover, the heat treatment jig according to the present invention is provided with the barriers in multiple layers as required. As described above, in the present invention, it is possible to prevent the intrusion of the chip even when a part of the barrier is broken.

  Moreover, the jig for heat treatment according to the present invention has a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of the plate glass to be placed, and a setter having a substantially flat plate glass placement portion on the plate glass placement surface, and the setter And a spacer for supporting the setter in order to secure a space for placing the plate glass between the setters, and a trap pattern composed of convex portions and concave portions is provided around the plate glass placing portion. is there. As described above, in the present invention, since the trap pattern composed of the convex portion and the concave portion is provided around the plate glass placing portion, even if the plate glass is warped by firing, the trap chip restricts the spacer chip. Since it is stopped, there is no chip on the mounting surface other than the trap pattern, there is no chip that can enter the gap space formed between the plate glass and the mounting surface, and the glass plate is not damaged.

  Further, the heat treatment jig according to the present invention is formed by forming a plurality of convex portions around the plate glass placing portion, as necessary. As described above, in the present invention, the trap pattern is formed so as to form a plurality of convex portions around the plate glass placement portion, so that it is possible to suppress the movement of the spacer chip in the direction of the glass plate while suppressing the movement of the spacer. Tip can be detained.

  In addition, the heat treatment jig according to the present invention is such that the trap pattern forms at least one concave portion around the placement portion as required. As described above, in the present invention, since the trap pattern is formed by forming at least one concave portion, unlike the case where the convex portion is formed, it is possible to easily place and remove the plate glass and to insert the spacer chip. Can be prevented from entering.

  Moreover, the jig | tool for heat processing which concerns on this invention forms the said convex pattern and a recessed part in the surroundings of a plate glass mounting part as needed. Thus, in this invention, the trap pattern which consists of a convex part and a recessed part can also be comprised, and it can have the advantage of a convex part and a recessed part. By providing a plurality of recesses on the inner periphery of the plate glass placement part and providing a plurality of projections on the outer periphery of the plate glass placement part, the arrangement of the spacers is facilitated by the plurality of protrusions on the outer periphery while facilitating placement on the placement part. Suppresses the movement of the chip in the direction of the glass sheet, holds the chip of the spacer, and even if the chip cannot be prevented by the convex part on the outer periphery, the chip is surely secured by the concave part on the inner periphery. Can be detained.

  In addition, the heat treatment jig according to the present invention forms the convex portion and / or the concave portion around the spacer as necessary to form a trap pattern. As described above, in the present invention, the convex portion and / or the concave portion can be formed also on the spacer to form the trap pattern, and the spacer chip can be positively restrained.

(First embodiment of the present invention)
A heat treatment jig according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows each state of one arbitrary heat treatment jig among a plurality of heat treatment jigs stacked in a plurality of stages according to the present embodiment. In the drawings to be used, for convenience of explanation, the actual setters, spacers, and plate glass which is a glass substrate for PDP are described in a different scale (the same applies to the following drawings).

  The jig for heat treatment according to the present embodiment has a thermal expansion coefficient equal to or lower than that of the plate glass 30 to be placed, and a setter 10 having a substantially flat plate glass placement portion on the plate glass placement surface, and the setter In order to secure a space for placing the plate glass 30 between the setters 10 in a plurality of stages, the spacer 20 supports the setter 10, and the thermal expansion coefficient of the setter 10 and the thermal expansion of the plate glass 30 to be placed The coefficient is substantially the same configuration. The heat treatment jig according to the present embodiment is also shown in the same manner as FIG. 10 showing the conventional heat treatment jig.

  The setter 10 is not particularly different in terms of shape as compared with the conventional setter, and is characterized in that the thermal expansion coefficient is substantially the same as the thermal expansion coefficient of the plate glass 30 to be heat-treated. The setter 10 is made of crystallized glass, and this crystallized glass is generally made by melting and forming a glass having a special composition and then reheating it under controlled conditions to make a desired fine crystal uniform. Precipitated to give excellent properties that cannot be obtained in the original glass state. One of the excellent characteristics is strength characteristics. The other characteristics are acid resistance and alkali resistance, and can be repeatedly used as a jig for heat treatment on which the plate glass 30 to be baked in a baking furnace is placed.

  The spacer 20 supports the setter 10, and a contact portion that is in direct contact with the setter 10 is formed flat. Further, as shown in FIG. 10, the spacers 20 are arranged near the four corners of the plate glass placement surface of the setter 10 to support the setter 10. The spacer 20 is also made of the same crystallized glass as the setter 10.

  Next, the case where the plate glass 30 is mounted and actually baked using the heat treatment jig according to the present embodiment will be described. A plate glass 30 to be heat-treated is placed on the plate glass placement portion of the setter 10, and spacers 20, that is, four spacers 20 are arranged near the four corners of the placement surface of the setter 10. Further, another setter 10 is placed on these four spacers 20, and the plate glass 30 is placed on the plate glass placement portion of the other setter 10. Thereafter, the same operation is repeated and stacked in a desired number of stages, and then loaded into a firing furnace. Here, when stacking and carrying in, it is performed carefully so that chips are not generated in the spacer 20 as much as possible. A belt conveyor is generally used for carrying into the firing furnace. After carrying in the firing furnace, firing is performed. FIG. 1A shows a state before firing any one of the plurality of heat treatment jigs stacked in a plurality of stages. Due to the firing, the plate glass 30 is heated from the surface that is not in contact with the setter 10, and the temperature inside the plate glass 30 and the portion in contact with the setter 10 is not increased so that the temperature distribution in the same plate glass 30 is different. The outer periphery of 30 is warped in the upper surface direction. At the same time, the setter 10 having substantially the same thermal expansion coefficient is also deformed due to the internal temperature difference and warps. FIGS. 1B and 1C show two states over time during firing of any one heat treatment jig of a plurality of heat treatment jigs stacked in a plurality of stages. As can be seen from a comparison between FIG. 1B and FIG. 1C, in this embodiment, the thermal expansion coefficient of the setter 10 and the thermal expansion coefficient of the plate glass 30 to be placed are substantially the same. Therefore, if warpage occurs in the plate glass 30, warpage similar to the warpage of the plate glass 30 also occurs in the setter 10. In addition, since the plate glass 30 is an object to be processed, and the setter 10 is used to place the plate glass 30 as the object to be processed during the firing process, the thermal expansion coefficient of the plate glass 30 is normally limited by the required specifications. Thus, the coefficient of thermal expansion of the setter 10 is adjusted. Adjustment of the thermal expansion coefficient can be realized by changing the composition of the glass.

  As described above, according to the jig for heat treatment according to the present embodiment, the thermal expansion coefficient of the setter 10 and the thermal expansion coefficient of the plate glass 30 to be placed are substantially the same. At first, the temperature distribution in the plate glass 30 is different and warpage occurs, but since the setter 10 having the same thermal expansion coefficient corresponding to this warpage also has the same warpage and the firing is completed while maintaining the adhesion, Even if the separation between the plate glass 30 and the setter 10 due to the warp of the plate glass 30 is not so wide, even if the chip of the spacer 20 is generated and moved by firing with hot air, the possibility that the chip enters the separation space becomes extremely small. Can be prevented with a very high probability. Further, even if the chip of the spacer 20 is mixed in the gap between the plate glass 30 and the setter 10, since the thermal expansion coefficients of both the members are almost the same, there is no difference in stretchability. Can be relieved by scratches.

(Second embodiment of the present invention)
A heat treatment jig according to a second embodiment of the present invention will be described with reference to FIG. 2 or FIG. 2 is a partial perspective view and an enlarged view of a main part of the heat treatment jig according to the present embodiment, and FIG. 3 is another example of an enlarged view of the main part of the heat treatment jig of FIG. In FIG. 2, the setter 10 is partially cut and drawn in order to clarify the positional relationship between the setter 10 and the plate glass 30.

  In FIG. 2, the jig for heat treatment according to the present embodiment has a thermal expansion coefficient equal to or lower than that of the plate glass to be placed, and a setter 10 having a substantially flat plate glass placement portion on the plate glass placement surface; The setter 10 includes a plurality of stages, and a spacer 20 that supports the setter 10 in order to ensure a space for placing the plate glass 30 between the setters 10, and of the opposing surfaces of the plate glass placement surface of the setter 10, In this configuration, the outer peripheral edge of the setter, which is the outer area of the plate glass placement area, and the outer peripheral edge periphery 10a are formed thinly.

  The formation of the thin surface facing the plate glass placement surface of the setter 10 means that the surface of the setter 10 serving as the plate glass placement surface is kept flat as before, and the back surface of the placement surface facing the placement surface is scraped and formed thin. That is.

  Next, the case where the plate glass 30 is mounted and actually baked using the heat treatment jig according to the present embodiment will be described. In addition, since it is the same as that of the said 1st Embodiment about the process which piles up the setter 10 in several steps and carries it in to a baking furnace, description is abbreviate | omitted. After carrying in the firing furnace, firing is performed. Due to the firing, the plate glass 30 is deformed due to an internal temperature difference and warps. On the other hand, even if the setter 10 has a lower thermal expansion coefficient than that of the plate glass, the outer peripheral edge and the outer peripheral edge, which are the outer regions of the plate glass mounting region, are thinly formed. Occurs. Therefore, since the same warp is generated between the plate glass 30 and the setter 10 and the baking is completed while maintaining the adhesion, the separation between the plate glass 30 and the setter 10 due to the warp of the plate glass 30 is not so wide, and the chip of the spacer 20 is temporarily provided during this time. Even if it occurs and moves during firing by hot air, the possibility that the chip enters the gap space becomes extremely small, and damage to the plate glass 30 can be prevented with a very high probability.

  In addition, although the jig | tool for heat processing which concerns on this embodiment formed thinly the outer periphery of the inner setter 10 and the outer periphery periphery 10a of the opposing surface of the plate glass mounting surface of the setter 10, the plate glass mounting surface of the setter 10 Can also be formed thin. In this case as well, as in the case where the opposing surface of the plate glass placement surface of the setter 10 is formed thin, damage to the plate glass 30 can be prevented with a very high probability, and an inclined surface is formed in the outer region of the plate glass placement region. As a result, the chip of the spacer 20 rolls off from the inclined surface, so that the glass plate 30 can be further prevented from being damaged.

  In addition, the heat treatment jig according to the present embodiment is provided with an inclination as shown in FIG. 2 to form a thin opposing surface of the plate glass mounting surface of the setter 10, but as shown in FIG. 3 (a) or (b). In addition, it is also possible to form a stripe-shaped dent 101 on the opposing surface of the plate glass placement surface of the setter 10 to make the opposing surface of the plate glass placement surface of the setter 10 thin. In this case, the same effect can be obtained. it can.

  As described above, in the present embodiment, the setter 10 is warped in response to the warp of the glass sheet 30 by forming the outer peripheral edge and the outer peripheral edge periphery 10a of the setter 10 to be thin. The warp of the setter 10 can be flexibly adjusted by combining the formation of a thick or thin film and the formation of a thick film. In order to form the setter 10 thin, for example, the setter 10 having the same thickness can be thinly formed by polishing. 3A, the recesses 101 are formed only on the outer peripheral edge and the outer peripheral edge periphery 10a of the setter 10, but as shown in FIG. 3B, the recesses are formed on portions other than the outer peripheral edge and the outer peripheral edge periphery 10a. Thus, the warpage of the setter 10 can be adjusted. However, in this case, it is necessary to vary the size of the recess.

(Third embodiment of the present invention)
A heat treatment jig according to a third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view of a heat treatment jig on which a plate glass according to the present embodiment is placed.

  The heat treatment jig according to the present embodiment shown in FIG. 4 has a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of the plate glass 30 to be placed, and has a substantially flat plate glass placement portion on the plate glass placement surface. And a spacer 20 that supports the setter 10 in order to secure a space for placing the plate glass 30 between the setters 10 in a plurality of stages, and the plate glass 30 is fitted on the plate glass placement surface of the setter 10. It is the structure which forms the fitting part 12 which is a possible dent.

  The fitting portion 12 corresponds to a plate glass placing portion, and is formed to have a depth that allows the plate glass 30 to be fitted therein. Is formed. Specifically, even when the plate glass 30 is warped by heating and the height of the whole plate glass is larger than the height of a normal plate glass without warp, the depth is large enough to cover the height dimension. It is formed as follows. When the depth of the fitting portion 12 is small, the outer peripheral portion of the plate glass 30 protrudes from the fitting portion 12 when the plate glass 30 is warped, so that the periphery of the fitting portion 12 of the setter 10 is connected to the fitting portion 12. Since there is a possibility that the chip of the spacer 20 rolls down as a guide to the gap space formed between the plate glass 30, the fitting portion 12 is deeper than the height of the whole plate glass in a warped state. Moreover, the bottom face of the fitting part 12 comprises the said plate glass mounting part.

  Next, the case where the plate glass 30 is mounted and actually baked using the heat treatment jig according to the present embodiment will be described. The stacking of the plurality of stages of setters 10 and the loading into the firing furnace are the same as those in the first embodiment, and a description thereof will be omitted. FIG. 4A shows a cross-sectional view before firing of any one of the plurality of heat treatment jigs stacked in a plurality of stages. After carrying in the firing furnace, firing is performed. As shown in FIG. 4B, the glass plate 30 is deformed due to the temperature difference inside and is warped by firing. Even if warpage occurs, even the sides of the upper surface at the highest position in the plate glass 30 are completely buried in the fitting portion 12. Therefore, the entrance for the chip of the spacer 20 to enter between the plate glass placement surface of the setter 10 and the plate glass 30 is minimized. FIG. 4B is a cross-sectional view during firing of any one of the plurality of heat treatment jigs assembled in a plurality of stages.

  Thus, according to the jig for heat treatment concerning this embodiment, since fitting part 12 which is a dent which can fit plate glass 30 is formed in a plate glass mounting surface of setter 10, fitting part which requires plate glass 30 is attached. 12, when the plate glass 30 is warped and a gap space is formed between the plate glass 30 and the glass placement surface of the setter 10, the chip of the spacer 20 is placed in the space. The entrance for intrusion is a small gap between the glass plate 30 and the fitting portion 12, and the chip does not actually enter.

(Fourth embodiment of the present invention)
A heat treatment jig according to a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a top view of the heat treatment jig according to the present embodiment, an enlarged perspective view of the main part and an enlarged view of the main part, FIG. 6 is a perspective view of the main part of the heat treatment jig according to the present embodiment, and FIG. It is a principal part perspective view of the jig for heat processing concerning a form.

  In FIG. 5, the jig for heat treatment according to the present embodiment has a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of the plate glass 30 to be placed, and is a flat glass plate mounting portion (plate glass mounting portion) on the plate glass mounting surface. And a spacer 20 that supports the setter 10 in order to secure a space for placing the plate glass 30 between the setters 10 in a plurality of stages. On the placement surface, a barrier 41 having an L-shaped planar shape lower than the height of the spacer 20 is formed at a position between the spacer 20 and the plate glass placement portion.

  In FIG. 5, the L-type barrier 41 is formed in an L-shape and a height larger than the thickness of the plate glass so as to protect the plate glass. Here, the reason why the height of the L-type barrier 41 is lower than the height of the spacer 20 is that a chip is generated by the L-type barrier 41 when it is equal to or higher than the spacer 20.

  Next, the case where the plate glass 30 is mounted and actually baked using the heat treatment jig according to the present embodiment will be described. The stacking of the plurality of stages of setters 10 and the loading into the firing furnace are the same as those in the first embodiment, and a description thereof will be omitted. After carrying in the firing furnace, firing is performed. Due to the firing, the plate glass 30 is deformed due to an internal temperature difference and warps. In the case where warpage occurs, each vertex of the upper side, which is the highest position in the plate glass 30, is particularly higher at each vertex than the other portions, that is, this portion is formed by warpage of the chip of the spacer 20 and the set glass 10 Although it becomes a gap space with the plate glass mounting surface and becomes a portion where the chip easily enters, an L-type barrier 41 is formed so as to protect the plate glass 30 in this portion, thereby preventing the chip from entering.

  As described above, according to the jig for heat treatment according to the embodiment, the spacer from the portion where the plate glass 30 and the plate glass of the setter 10 generated by the warp of the plate glass 30 at the time of firing become the largest gap between the mounting surfaces. The L-type barrier 41 is formed to prevent the intrusion of 20 chips, and the intrusion of the chips into the gap space can be greatly reduced.

  The L-shaped barrier 41 can be formed in a frame shape that surrounds the periphery of the plate glass placement portion to prevent chip intrusion around the entire periphery of the plate glass. Furthermore, as shown in FIG. 6, it is possible to prevent intrusion of chips flying from above by forming the frame type barrier 42 in multiple layers. Further, when the frame-type barriers 42 are formed in a plurality of layers in this way, even if one frame-type partition wall 42 is partially damaged, the other frame-type barriers 42 can prevent chip penetration. .

  Further, as shown in FIG. 7, the barrier 43 can be formed in an annular pattern surrounding the spacer 20, and in this case, the movement of the chip of the spacer 20 can be directly restricted. As for the barrier 43 having a pattern surrounding the spacer 20, since the chip of the spacer 20 is stored in the barrier pattern, it is desirable to form a discharge port in the side surface direction of the setter 10.

(Fifth embodiment of the present invention)
A heat treatment jig according to a fifth embodiment of the present invention will be described with reference to FIG. 8 or FIG. FIG. 8 is a partial perspective view of the heat treatment jig according to the present embodiment and an enlarged view of a main part thereof. FIG. 9 is another example of an enlarged view of the main part of the heat treatment jig of FIG.

  The jig for heat treatment according to the present embodiment has a thermal expansion coefficient equal to or lower than that of the plate glass 30 to be placed, and a setter 10 having a substantially flat plate glass placement portion on the plate glass placement surface, and the setter In order to secure a space for placing the glass plate 30 between the setters 10 with a plurality of stages 10 and a spacer 20 that supports the setter 10, and to detain scrap such as chips of the spacers 20 that are not placement objects The trap pattern is formed.

  For example, as shown in FIG. 8, the trap pattern can be formed by forming a plurality of convex portions 51 having a height lower than the thickness dimension of the plate glass around the plate glass mounting portion. The convex portion 51 can also be formed by creating a separate convex portion and placing it on the setter 10.

  Next, the case where the plate glass 30 is mounted and actually baked using the heat treatment jig according to the present embodiment will be described. The stacking of the plurality of stages of setters 10 and the loading into the firing furnace are the same as in the first embodiment, and the description thereof is omitted. After carrying in the firing furnace, firing is performed. Due to the firing, the plate glass 30 is deformed due to an internal temperature difference and warps. Even if a gap is generated between the plate glass 30 and the plate glass placement surface of the setter 10 due to the warpage of the plate glass 30 due to the firing, the chip of the spacer 20 is held by the trap pattern 51, and thus the plate glass 30 and the setter 10. There is no chip that can enter the space between the plate glass mounting surface and the plate glass mounting surface. Therefore, it is possible to prevent the chip glass 30 from being damaged by the chip. Although only one trap pattern may be formed, when a plurality of trap patterns are formed, the chip of the spacer 20 can be restrained while suppressing the movement of the chip of the spacer 20 toward the plate glass 30.

  Instead of the convex portion 51, a trap pattern can be formed by forming a concave portion 52 around the plate glass placing portion as shown in FIG. In this case, it is possible to easily dispose / remove the plate glass 30 and to prevent the spacer 20 from entering the chip. The recess 52 can be formed, for example, by cutting a corresponding portion of the recess 52 of the setter 10.

  Further, in the heat treatment jig according to the present embodiment, the trap pattern can be configured so that the convex portions 51 and the concave portions 52 are formed around the plate glass placement portion, and the advantages of the convex portions 51 and the concave portions 52 are obtained. For example, as shown in FIG. 9B, one convex portion 51 is provided on the inner periphery of the plate glass placement portion, and a plurality of concave portions 52 are provided on the outer periphery of the plate glass placement portion. The chip is securely held by the plurality of concave portions 52 on the outer periphery, and even if the chip cannot be held by the concave portion 52, the chip that cannot be held by the concave portion 52 by the inner peripheral convex portion 51 is moved toward the plate glass 30. You can avoid it.

  Moreover, in the jig for heat treatment according to the present embodiment, a plurality of concave portions 52 are provided on the inner periphery of the placement portion, and one convex portion 51 is provided on the outer periphery of the plate glass placement portion. Even if the chip is prevented from moving in the direction of the glass sheet 30 by the portion 51 and the convex portion 51 is overcome, the chip can be held by the concave portion 52 on the inner periphery. Furthermore, since the convex part 51 is formed in the outer side in this case, arrangement | positioning to the plate glass mounting part of the plate glass 30 becomes easy.

It is each state of the arbitrary one heat processing jig | tool of the several heat processing jig | tool piled up in the multistage concerning the 1st Embodiment of this invention. It is the fragmentary perspective view and principal part enlarged view of the jig | tool for heat processing which concerns on the 2nd Embodiment of this invention. It is another example of the principal part enlarged view of the jig for heat processing of FIG. It is sectional drawing of the jig | tool for heat processing which mounted the plate glass which concerns on the 3rd Embodiment of this invention. It is the upper side figure, principal part expansion perspective view, and principal part enlarged view of the backplate of PDP which concern on the 4th Embodiment of this invention. It is a principal part perspective view of the jig for heat processing concerning the 4th Embodiment of this invention. It is a principal part perspective view of the jig for heat processing concerning the 4th Embodiment of this invention. The fragmentary perspective view of the jig for heat processing concerning the 5th Embodiment of this invention, and its principal part enlarged view It is another example of the principal part enlarged view of the jig for heat processing of FIG. Top view and usage diagram of conventional heat treatment jig It is a whole perspective view of the conventional heat treatment jig.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Setter 10a Outer periphery and periphery of outer periphery 12 Insertion part 20 Spacer 30 Sheet glass 41 L-type barrier 42 Frame-type barrier 43 Annular barrier 51 Convex part 52 Concave part 101 Depression

Claims (10)

A setter having a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of the plate glass to be mounted and having a substantially flat plate glass mounting portion on the plate glass mounting surface, and mounting the plate glass between the setters using the setter as a plurality of stages In a heat treatment jig comprising a spacer that supports a setter in order to secure a space to perform,
The difference between the coefficient of thermal expansion of the setter and the coefficient of thermal expansion of the plate glass to be placed is 10 × 10 −7 or less. A setter having a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of the plate glass to be mounted and having a substantially flat plate glass mounting portion on the plate glass mounting surface, and mounting the plate glass between the setters using the setter as a plurality of stages In a heat treatment jig comprising a spacer that supports a setter in order to secure a space to perform,
A heat treatment jig, characterized in that an outer periphery and an outer periphery of the setter are thinly formed. The heat treatment jig according to claim 2, wherein the outer peripheral edge and the outer peripheral edge of the surface of the setter facing the plate glass placement surface are formed thin. The heat treatment jig according to claim 2, wherein the outer periphery and the periphery of the outer periphery of the plate glass mounting surface of the setter are formed thin. A setter having a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of the plate glass to be placed and having a substantially flat placement portion on the plate glass placement surface, and placing the plate glass between the setters using the setter as a plurality of stages. In a heat treatment jig comprising a spacer that supports a setter to secure a space,
A heat treatment jig, wherein a plurality of recesses are formed on an outer periphery of the setter and a surface facing the plate glass mounting surface around the outer periphery. A setter having a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of the plate glass to be mounted and having a substantially flat plate glass mounting portion on the plate glass mounting surface, and mounting the plate glass between the setters using the setter as a plurality of stages In a heat treatment jig comprising a spacer that supports a setter in order to secure a space to perform,
The set glass platen portion of the setter is formed of a concave portion into which the plate glass can be fitted, and the depth of the concave portion is formed to a depth capable of accommodating the plate glass in a state of being warped due to thermal deformation. A jig for heat treatment. A setter having a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of the plate glass to be mounted and having a substantially flat plate glass mounting portion on the plate glass mounting surface, and mounting the plate glass between the setters using the setter as a plurality of stages In a heat treatment jig comprising a spacer that supports a setter in order to secure a space to perform,
A heat treatment jig, wherein a barrier having an L shape with a planar shape lower than the height of the spacer is provided between the position of the spacer on the plate glass mounting surface and the plate glass mounting portion. A setter having a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of the plate glass to be mounted and having a substantially flat plate glass mounting portion on the plate glass mounting surface, and mounting the plate glass between the setters using the setter as a plurality of stages In a heat treatment jig comprising a spacer that supports a setter in order to secure a space to perform,
A heat treatment jig, characterized in that a barrier having a shape surrounding the plate glass mounting portion lower than the height of the spacer is provided on the outer periphery of the plate glass mounting portion. In the jig for heat treatment according to claim 8,
A heat treatment jig comprising a plurality of the barriers. A setter having a thermal expansion coefficient equal to or lower than the thermal expansion coefficient of the plate glass to be mounted and having a substantially flat plate glass mounting portion on the plate glass mounting surface, and mounting the plate glass between the setters using the setter as a plurality of stages In a heat treatment jig comprising a spacer that supports a setter in order to secure a space to perform,
A heat treatment jig, wherein a trap pattern comprising a convex portion and a concave portion is provided around the plate glass placement portion.

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