JP3974813B2 - Buffer material for glass plate and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a frame-shaped glass plate cushioning material interposed between adjacent glass plates for impact reduction when a plurality of glass plates are laminated, and a method for manufacturing the same, and more particularly, to a liquid crystal display. The present invention relates to a glass plate cushioning material mainly used for storage of glass plates and a method for producing the same.
[0002]
[Prior art]
When a glass plate used as a material for a liquid crystal display is stacked and stored, a frame-shaped cushioning material is interposed between the glass plates in order to reduce the impact between adjacent glass plates. The frame-shaped cushioning material here is a sheet made of an impact relaxation material such as foamed polyethylene, and is interposed between adjacent glass plates by laminating the glass plates in a state of being mounted on one surface of the glass plate. It will be.
[0003]
FIG. 11 is a plan view of a conventional cushioning material used for a glass plate for a liquid crystal display, FIG. 12 is a view taken along the line AA in FIG. 11, and FIG. 13 is an explanatory diagram of a method for producing the cushioning material. A conventional cushioning material is manufactured by punching out a regular square sheet made of foamed polyethylene by Thomson processing. That is, a portion of the regular square sheet excluding the outer edges of the four sides is punched out by Thomson processing, and the remaining frame-shaped portion 1 becomes a cushioning material. On the other hand, the punched portion 2 is discarded as broken material.
[0004]
[Problems to be solved by the invention]
The conventional buffer material for glass plates manufactured by such Thomson punching has the following problems.
[0005]
First, the punched portion 2 is large. Since the punched portion 2 is a loss portion that is discarded without being reused, it is not economical. In other words, an increase in manufacturing cost due to a decrease in the product collection rate from a regular square sheet has been a problem.
[0006]
Secondly, in the punching by Thomson processing, the cross-sectional shape of each side of the manufactured cushioning material 1 becomes a flat quadrangle, more specifically, a quadrangle without roundness at the four corners peculiar to Thomson processing. As a result, there has been a problem that the adhesion when mounted on the surface of the glass plate is increased, and the condition of the liquid when coating the surface in the state of being mounted on the surface of the glass plate is not good. Further, since the coating film on the surface of the glass plate is easily damaged, the removal from the surface of the glass plate is performed by blowing air, but the workability at the time of removal is poor due to the high adhesion described above.
[0007]
The present invention was devised in view of such circumstances, and an object thereof is to provide a glass plate cushioning material excellent in economy that can greatly suppress the occurrence of a loss part in the manufacturing process and a method for manufacturing the same. . Another object of the present invention is to provide a buffer material for glass plate that can reduce the adhesion to the surface of the glass plate and a method for producing the same.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the glass plate cushioning material according to the present invention is a frame-like glass plate cushioning material interposed between adjacent glass plates for impact relaxation when a plurality of glass plates are laminated. In addition, the four strip-shaped members made of the impact relaxation material are combined in a frame shape, and the ends of the two strip-shaped members intersecting at substantially right angles at the four corner portions have the same thickness as the other portions. The strip-shaped member employs a configuration in which roundness is applied to a corner on one surface side .
[0009]
In the buffer material for glass plates according to the present invention, the buffer material is composed of four strip-shaped members. The strip-shaped member is efficiently collected from the sheet material by cutting the sheet material made of the impact relaxation material with a predetermined width. For this reason, generation | occurrence | production of the loss part in a manufacture process is suppressed significantly. And since the end portions of the two strip-shaped members that intersect at substantially right angles at the four corner portions are abutted and joined so as to have the same thickness as the other portions, a square sheet of a regular size is processed by Thomson processing. A function equivalent to that of a conventional integrally formed cushioning material manufactured by punching is obtained.
[0010]
If a configuration is adopted in which a recess is formed at one end of two strip-shaped members that are abutted at four corners, and a projection formed at the other end is fitted into the recess, the strip The temporary assembling work of the shaped members is simplified, and the joining strength is increased by increasing the joining length at the abutting portion.
[0011]
Here, if the concave portion and the convex portion are formed by press working, roundness is given to the two corners existing on one surface side of the strip-shaped member, and attached to the surface of the glass plate. When the adhesiveness is reduced.
[0012]
As a method for joining the butted portions, ultrasonic welding is preferable from the viewpoints of joinability, workability, efficiency, and the like.
[0013]
Moreover, the manufacturing method of the buffer material for glass plates which concerns on this invention is a manufacturing method of the buffer material for frame-shaped glass plates interposed between adjacent glass plates in order to relieve | shock impact when a plurality of glass plates are laminated. A step of collecting a plurality of strip-shaped members from a sheet material made of an impact mitigating material, and forming a concave portion at one end of each strip-shaped member by pressing, and forming a convex portion at the other end. The step of forming, combining the four strip-shaped members into a frame shape, and fitting the end portions of the two pairs of strip-shaped members together by fitting the convex portions to the concave portions at each corner portion, and And joining the butt portion by ultrasonic welding, and rounding is given to the corner on the one surface side of the strip-shaped member in the press working step .
[0014]
In the manufacturing method of the buffer material for glass plates which concerns on this invention, generation | occurrence | production of the loss part in a manufacture process is suppressed significantly by extract | collecting several strip-shaped members from the sheet | seat material which consists of an impact relaxation material. By forming a concave portion at one end of each strip-shaped member by pressing and forming a convex portion at the other end, roundness is imparted to two corners existing on one surface side of the strip-shaped member. Thus, the adhesion when mounted on the surface of the glass plate is reduced. By combining the four strip-shaped members into a frame shape and fitting the convex portions to the concave portions at each corner portion, the end portions of the two strip-shaped members that intersect at substantially right angles at each corner portion and the other portions While being abutted so as to have the same thickness, the contact length at the abutting portion is increased, thereby increasing the bonding strength. By using ultrasonic welding as a method for joining the butt portions, the joining property, workability, efficiency, etc. are excellent.
[0015]
When performing ultrasonic welding with a vibration horn on a work table, the welding strength is increased by making the tip of the vibration horn smaller in diameter than other portions.
[0016]
When performing the ultrasonic welding with a vibration horn on a work table, the work table is made of metal, so that the escape of ultrasonic vibration energy to the work table side is suppressed, and the butt portion is solid over the entire thickness. Since it is welded, the welding strength increases.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 is a perspective view of a buffer material for a glass plate according to an embodiment of the present invention, FIG. 2 is a perspective view for explaining a usage pattern of the buffer material for the glass plate, and FIGS. 3 to 9 are buffer materials for the glass plate. It is explanatory drawing of the manufacturing method of material.
[0018]
As shown in FIG.1 and FIG.2, the buffer material 10 for glass plates which concerns on this embodiment is used as a buffer material in the case of laminating | stacking and storing the glass plate 20 used as a raw material of a liquid crystal display. More specifically, by mounting the glass plate cushioning material 10 on one surface of the glass plate 20 and laminating the glass plates 20 with the mounting surfaces facing in the same direction, the adjacent glass plates 20 and 20 are stacked. The buffer material 10 for glass plates is interposed therebetween.
[0019]
Each glass plate cushioning material 10 is a frame-like sheet made of foamed polypropylene, non-foamed polypropylene, foamed polyethylene or the like, and more specifically, four elongated strips made of a sheet material made of foamed polypropylene or the like. The members 11A, 11A, 11B, and 11B are combined in a frame shape. A pair of convex portions 12 and 12 projecting toward the tip end are formed at both end portions of the two parallel strip-shaped members 11A and 11A. A pair of concave portions 13 and 13 are formed at both ends of the other two parallel strip-shaped members 11B and 11B so as to open sideways so that the convex portions 12 and 12 are fitted.
[0020]
In each corner portion of the buffer material 10 for glass plate, the strip-shaped members 11A and 11B intersect at a right angle, and the front end surface of the strip-shaped member 11A is strip-shaped by fitting the convex portions 12 into the corresponding concave portions 13. It is abutted against the side surface of the tip of the member 11B. The butted portions of the strip-shaped members 11A and 11B are welded at high frequency, whereby the four strip-shaped members 11A, 11A, 11B, and 11B are joined to form the frame-shaped cushioning material 20. The formed cushioning material 20 has a uniform thickness as a whole without overlapping the strip-shaped members 11A and 11B.
[0021]
The size of the buffer material for glass plate 10 is slightly smaller than that of the glass plate 20, and the thickness is suitably 1.5 to 2.0 mm. Further, the width of the strip-shaped members 11A and 11B is suitably 5.0 to 7.0 mm. In addition, if it is the buffer material 10 for glass plates used for the glass plate of 1250 * 800mm called the original glass before cut | disconnecting to the glass plate 20 used for a liquid crystal display, thickness will be 2.0 mm, A width of 35-50 mm is appropriate.
[0022]
Next, the manufacturing method of the buffer material 10 for glass plates which concerns on this embodiment is demonstrated with reference to FIGS.
[0023]
First, as shown in FIG. 3, a regular sheet 30 made of foamed polyethylene or the like is cut into a predetermined width to produce a plurality of elongated strip-shaped members 31, 31,. For this cutting, for example, Thomson punching is used. The widths of the strip-shaped members 31, 31,... Are made to coincide with the widths of the strip-shaped members 11A, 11B constituting the buffer material 10 for glass plate.
[0024]
When the strip-shaped members 31, 31,... Are obtained, the strip-shaped member 31 is cut into the same length as the strip-shaped members 11A, 11B. Thereafter, as shown in FIG. 4, for the strip-shaped member 31A corresponding to the strip-shaped member 11A, a pair of convex portions 32, 32 which are convex portions 12, 12 are formed at both ends, and the strip-shaped member is formed. For the strip-shaped member 31B corresponding to 11B, a pair of recesses 33, 33 to be the recesses 13, 13 are formed at both ends. The convex portions and the concave portions are formed by pressing the strip-shaped members 31A and 31B.
[0025]
Thus, the strip-shaped members 11A and 11B are efficiently collected from the regular sheet 30 without causing a large loss portion. Further, along with the press work for forming the convex part and the concave part, roundness is given to two corners existing on one surface side of the strip-like members 11A and 11B (see FIG. 5). By attaching the rounded surface to the glass plate, adhesion to the glass plate is eased.
[0026]
When the strip-shaped members 11A and 11B are collected, the strip-shaped members 11A and 11B are brought into contact with each other on the work table 40 as shown in FIGS. The work table 40 is made of iron or stainless steel, and an L-shaped groove 41 for positioning into which the strip-shaped members 11A and 11B are fitted is formed on the surface thereof. When the strip-shaped members 11A and 11B are abutted on the work table 40, the abutting portions are pressed by a welding vibration horn 50 and are welded at a high frequency. The vibration horn 50 is a cylindrical body having a tip 51 smaller in diameter than the other part (base 52), and is made of aluminum.
[0027]
By the high frequency welding by the vibration horn 50, the strip-shaped members 11A and 11B are joined in an L shape. The joint has no step and has the same thickness as the other parts. Further, as shown in FIG. 9, when the width of the strip-shaped members 11A and 11B is a, the width of the convex portion 12 is a / 3, and the height of the convex portion 12 is a / 3, the strip-shaped members 11A and 11B. The joining length is 5a / 3, and the joining length is 5/3 times that of the case where the strip-like members 11A and 11B are simply abutted without providing the convex portion 12 and the concave portion 13. In order to secure a clearance between the convex portion 12 and the concave portion 13, the width of the convex portion 12 is preferably narrower by about 1 mm than the width of the concave portion 13.
[0028]
The work table 40 is usually made of bakelite. In the case of a work table made of bakelite, vibration energy escapes downward, so that only the upper half of the butted portion is sufficiently welded. However, since the work table 40 is made of metal such as iron or stainless steel, the downward escape of vibration energy is suppressed, so that the butt portion is sufficiently welded over the entire thickness, and the welding strength is increased.
[0029]
In the vibration horn 50, the distal end portion 51 has a smaller diameter than the base portion 52. Specifically, as shown in FIG. 9, the diameter d of the distal end portion 51 is substantially the same as the width of the convex portion 12 and is ¼ of the diameter D of the base portion 52. Further, the length L of the distal end portion 51 (small diameter portion) is set to be the same as the diameter D of the base portion 52 (large diameter portion). As a result, the vibration frequency at the tip 51 of the vibration horn 50 is four times the frequency added to the base 52.
[0030]
That is, the frequency applied to the base 52 of the vibration horn 50 is bHz, the ratio of the diameter d of the tip 51 to the diameter D of the base 52 is 1 / c, and the length L of the tip 51 is the diameter D of the base 52. , The vibration frequency at the tip 51 of the vibration horn 50 is b × cHz. As a result, the frequency can be easily increased, and this also makes it possible to increase the welding strength.
[0031]
10 (a) and 10 (b) are plan views of the main part of a buffer material for glass plate according to another embodiment of the present invention. In FIG. 10A, the convex portion 12 and the concave portion 13 provided at the end portions of the strip-shaped members 11A and 11B are formed in an inverted trapezoidal shape that becomes wider toward the tip. In FIG. The end of the member 11 </ b> A also serves as the convex portion 12. Any of the convex portions 12 and the concave portions 13 contributes to an improvement in workability at the time of temporarily assembling the strip-shaped members 11A and 11B and an increase in joining strength by extending the joining length.
[0032]
In the above-described embodiment, the protrusions 12 and 12 are provided at both ends of one strip member 11A, and the recesses 13 and 13 are provided at both ends of the other strip member 11B. It is also possible to provide the convex portion 12 at one end and the concave portion 13 at the other end.
[0033]
【The invention's effect】
As described above, the glass plate cushioning material according to the present invention is a frame-shaped glass plate cushioning material interposed between adjacent glass plates in order to reduce impact when a plurality of glass plates are laminated. Thus, the four strip-shaped members made of the impact relaxation material are combined in a frame shape, and the end portions of the two strip-shaped members intersecting at substantially right angles at the four corner portions have the same thickness as the other portions. Since the strip-shaped member adopts a configuration in which the corner on one surface side is rounded , the occurrence of a loss part in the manufacturing process can be greatly suppressed. A significant cost reduction is possible.
Moreover, since roundness is given to two corners existing on one surface side of the strip-shaped member constituting the buffer material for glass plate, by attaching the rounded side to the glass plate, Adhesion to the glass plate is eased.
[0034]
In addition, a recess is formed at one end of two strip-shaped members that are abutted at the four corners, and a protrusion formed at the other end is fitted into the recess, And by pressing a convex part, roundness can be given to two corners which exist in the one surface side of a strip-shaped member, and the adhesiveness when mounting | wearing on the surface of a glass plate can be reduced. As a result, the condition of the liquid when coating the surface of the glass plate in a state of being mounted on the surface becomes good, and the workability at the time of removal from the surface of the glass plate is also good.
[0035]
Further, the manufacturing method of the buffer material for glass plate according to the present invention includes a step of collecting a plurality of strip-shaped members from a sheet material made of an impact mitigating material, and a recess at one end of each strip-shaped member by pressing. And forming a convex portion at the other end, and combining the four strip-shaped members into a frame shape and fitting the convex portion into the concave portion at each corner portion, thereby forming two pairs of strip-shaped It includes a step of attaching the end portions of the members to each other and a step of joining each butted portion by ultrasonic welding, and rounding a corner on one surface side of the strip-shaped member in the press working step. Since it is doing, generation | occurrence | production of the loss part in a manufacture process can be suppressed significantly, and the adhesiveness to the surface of a glass plate can be eased collectively.
[Brief description of the drawings]
FIG. 1 is a perspective view of a buffer material for a glass plate according to an embodiment of the present invention.
FIG. 2 is a perspective view for explaining a usage pattern of the buffer material for glass plate.
FIG. 3 is an explanatory view of the glass plate cushioning material manufacturing method and is a plan view showing a step of creating a strip-shaped member from a sheet.
FIG. 4 is an explanatory view of the manufacturing method of the buffer material for glass plate, and is a plan view showing a process of forming convex portions and concave portions on a strip-shaped member.
FIG. 5 is a view taken along the line BB in FIG. 4;
FIG. 6 is an explanatory view of the manufacturing method of the buffer material for glass plate, and is a perspective view showing a step of joining strip-shaped members.
FIG. 7 is an explanatory view of the manufacturing method of the buffer material for glass plate, and is a perspective view showing a step of joining strip-shaped members.
FIG. 8 is an explanatory view of the manufacturing method of the buffer material for glass plate, and is an enlarged plan view of a joint portion.
FIG. 9 is an explanatory view of the manufacturing method of the buffer material for glass plate, and is a longitudinal sectional view showing a joining process of strip-shaped members.
FIGS. 10A and 10B are plan views of a joint portion of a buffer material for glass plate according to another embodiment of the present invention.
FIG. 11 is a plan view of a conventional cushioning material used for a glass plate for a liquid crystal display.
12 is a view taken along line AA in FIG.
FIG. 13 is an explanatory view of a conventional method for producing a cushioning material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Buffer material 11A, 11B for glass plates Strip-shaped member 12 Convex part 13 Concave part 20 Glass plate 30 Sheet 40 Work table 50 Vibration horn

Claims (7)

A frame-like buffer material for a glass plate interposed between adjacent glass plates for impact relaxation when a plurality of glass plates are laminated, and four strip-shaped members made of impact relaxation material are framed. In addition to being combined, the end portions of the two strip-shaped members that intersect at substantially right angles at the four corner portions are butted and joined so as to have the same thickness as the other portions . A cushioning material for glass plate , characterized in that roundness is imparted to the corners on the surface side . 2. A concave portion is formed at one end portion of two strip-shaped members that are abutted at four corner portions, and a convex portion formed at the other end portion is fitted into the concave portion. The buffer material for glass plates as described in 2. The buffer material for a glass plate according to claim 2, wherein the concave portion and the convex portion are formed by press working. The buffer material for glass plates according to claim 1, wherein the ends of the two strip-shaped members butted at the four corner portions are joined by ultrasonic welding. A method of manufacturing a frame-shaped glass plate cushioning material interposed between adjacent glass plates for impact reduction when a plurality of glass plates are laminated, and comprising a plurality of strips from a sheet material made of an impact relaxation material A step of collecting a strip-shaped member, a step of forming a concave portion at one end of each strip-shaped member by pressing, and a step of forming a convex portion at the other end, and combining the four strip-shaped members into a frame shape In addition, it includes a step of bringing the ends of two pairs of strip-shaped members together by fitting a convex portion to a concave portion at each corner portion, and a step of joining each butted portion by ultrasonic welding. The manufacturing method of the buffer material for glass plates characterized by providing roundness to the corner part of the one surface side of the said strip-shaped member by a press work process . 6. The method for producing a buffer material for a glass plate according to claim 5, wherein, when performing the ultrasonic welding with a vibration horn on a work table, the tip of the vibration horn has a smaller diameter than other portions. 6. The method of manufacturing a buffer material for a glass plate according to claim 5, wherein the work table is made of metal when performing the ultrasonic welding with a vibration horn on the work table.

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