JP2001219972A - Cushioning material and package employing said cushioning material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cushioning material which protects glass substrates without affecting electronic parts. SOLUTION: A protective cushioning material 1 for protecting a corner of a glass substrate is made up of expended beads formed of polyethylene or polypropylene having an expansion ratio of at least five times or more and a compressive strength of 1.08 MPa or below in a shape having a section approximately in an L-shape. A plurality of grooves 2, 2' for inserting the substrates therein in the depth of 2 to 10 mm with the opening thereof expanded are provided, running along the L-shape, at the inside of the protective cushioning material while guide grooves 3 for fixing devices such as rubbers or tapes are provided at the outside, and four of the protective cushioning materials are used as a unit cushioning material on packaging a plurality of glass substrates together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushioning material for transportation for protecting a glass substrate formed by forming an electronic component such as a semiconductor device on a non-conductive substrate such as glass from damage caused by vibrations during transportation. is there.

[0002]

2. Description of the Related Art In recent years, with the development of semiconductor devices, there has been a demand for the development of peripheral technologies such as packaging and transportation. A glass substrate in which an electronic component such as a semiconductor device is incorporated on a substrate such as glass is thin and is susceptible to impacts and the like, and has a very fine structure, so that it is easily affected by external factors and is difficult to handle.
In particular, when transporting in the state of intermediate components before the final product, the electronic components are handled in a bare state, and thus are more strongly affected by static electricity and dust.

FIG. 3 shows a conventional glass substrate packing method. In the figure, 21 is a glass substrate, and 31 is a cushioning material. The cushioning material 31 is a cushioning plate made of a low-foam material such as polystyrene having a braid whose outer periphery is slightly larger than the outer periphery of the glass substrate 21 and whose inner periphery is slightly smaller as shown in FIG. And a plurality of glass substrates 21 in order, for example, 10 sheets as one set, the periphery of which is further protected by a buffer plate or the like, and fixed by rubber or tape.

[0004]

However, in the cushioning material shown in FIG. 3, dust is generated by the bracket-shaped punching process, and when a plurality of aggregates are fixed, or due to vibration during transportation, etc. In addition, the buffer material and the glass substrate rub against each other, and electronic components on the glass substrate are extensively damaged. At the same time, the cushioning material is also damaged, generating fine dust,
There is also a problem that this adheres to the electronic component and damages the function of the surface. Therefore, with the glass substrate provided with the high function, the requirements cannot be achieved by the conventional packing method. Therefore, there is a need for a protective buffer material which is easily fixed in the air without a plurality of glass substrates coming into contact with each other and which is compact, does not generate dust, and has high chemical resistance because it is handled in a clean room.

[0005]

SUMMARY OF THE INVENTION The present invention provides a cushioning material 1 made of a polyolefin bead foam having an expansion ratio of at least 5 times and a compressive strength of 1.08 MPa or less. The cross section has a substantially L-shape in accordance with the shape of the corner of the glass substrate 21, and has a depth of 2 to 10 mm along the L-shape to fix the two sides forming the corner of the glass substrate inside. This is a cushioning material provided with a plurality of substrate insertion grooves 2 and 2 ′, wherein the side walls of the substrate insertion grooves 2 and 2 ′ are curved in the outward direction of the groove near the opening of the groove. Further, according to the present invention, a cube is formed by arranging a plurality of substrates in parallel at predetermined intervals, and each corner of each substrate is inserted into the substrate insertion groove of the cushioning material of the present invention to be orthogonal to the substrate surface. A packaging body characterized in that four sides of the cube are fitted and fixed by the cushioning material. In the present invention, a fixing tool 22 such as rubber, tape, etc.
It is desirable to provide at least one fixture guide groove 3 for guiding the guide.

In the cushioning material of the present invention, the glass substrate is fixed in the air by inserting the corner of the glass substrate into the substrate insertion groove, and at the same time, the contact with the adjacent glass substrate is prevented. Further, there is no portion other than the insertion groove where the glass substrate comes into contact with the cushioning material, and the dead space required on the periphery of the glass substrate is sufficient only in the region corresponding to the substrate insertion groove.

Further, the glass substrate intended by the cushioning material of the present invention is provided with a high-performance function, or is transported in a state provided with the glass substrate. We have to maintain the state. Therefore, it is required that the cleaning liquid has chemical resistance before use and that no dust is generated. Therefore, it is essential that the cushioning material is easy to handle in a clean room, and must withstand repeated cycles of cleaning, handling in a clean room, transportation, and the like. In the present invention, by using a polyolefin foam, by a sharp blade-like surface such as a cut surface of glass, even if repeatedly subjected to the impact of tearing,
Due to the flexibility of the polyolefin, it absorbs the above-mentioned impact and the bead has a large thickness of the skin, which is the most characteristic of the beads, so that the generation of dust is extremely small. Polystyrene-based resin (eg, EPS) beads, polystyrene-polyethylene copolymer resin foam, and the like, which are generally used in general, generate a large amount of dust due to the rigidity inherent to the resin during transportation, and damage the glass substrate. In addition, since polyolefin has excellent chemical resistance, it can withstand washing and can be adequately adapted to the above-mentioned repeated cycle.

Moreover, in the cushioning material of the present invention, the glass substrate is inserted into the substrate insertion groove because the side walls of the substrate insertion grooves 2, 2 'are curved in the outward direction of the groove near the opening of the groove. At this time, the end of the glass substrate smoothly enters the groove without being caught by the cushioning material, and is fixed. Furthermore, even when the glass substrate is tilted due to external force after being fixed, the stress applied to the cushioning material is small because the groove is widened near the opening, and the vicinity of the opening of the cushioning material is crushed and the glass substrate is crushed. There is no danger that the gripping action of the will decrease.

[0009]

FIG. 1 shows an embodiment of a cushioning material according to the present invention. In the drawing, reference numeral 1 denotes a cushioning material of the present invention, 2 and 2 'denote substrate insertion grooves, and 3 denotes a fixture guide groove. FIG. 2 shows an embodiment of the present invention in which a glass substrate is packed using this embodiment.
Shown in In the figure, 21 is a glass substrate, and 22 is a fixture.

As shown in FIG. 2, the cushioning material of the present invention protects the corners of the glass substrate and fixes it in the air. Therefore, a set of four units is packed at a minimum. As shown in FIG. 1, the cushioning material of the present invention has a substantially L-shaped cross-section according to the shape of the corner of the glass substrate, and the substrate is formed along the L-shape to fix two ends forming the corner of the substrate. Insertion grooves 2 and 2 'are provided. The width of the insertion grooves 2 and 2 ′ is appropriately selected from the thickness of the glass substrate that can utilize the cushioning material of the present invention, but the bottom is formed to be the same as or slightly narrower than the thickness of the substrate, and the elasticity of the foam is increased. Insert and fix the glass substrate using.

In the present invention, the distance between adjacent substrate insertion grooves is preferably formed to be 0.5 mm or more.
If it is less than 0.5 mm, the glass substrates are likely to come into contact with each other due to bending of the substrate during transportation, which is not preferable. More preferably, it is in the range of 1 mm or more and 10 mm or less. 1mm
As described above, there is no fear of contact between adjacent glass substrates due to bending or the like during transportation. On the other hand, if it exceeds 10 mm, it becomes undesirably bulky and the transport amount is reduced.

In the present invention, when a glass substrate is inserted, the distance between adjacent glass substrates is 0.5 mm.
It is desirable that the opening be at least 1 mm or more. Further, the depth of the substrate insertion groove is also appropriately selected depending on the size and thickness of the glass substrate, but is 2 to 10 mm in the present invention.

Further, in the present invention, as shown in FIG. 1, since the side walls of the insertion grooves 2 and 2 'are formed so as to be curved outward of the groove in the vicinity of the opening of the groove, the glass substrate The attachment and detachment are easy, and the generation of dust near the opening of the insertion groove can be drastically reduced. In the present invention, at least 5 or more, preferably 10 to 100 glass substrates are simultaneously packaged. Therefore, the number of substrate insertion grooves is also required to be 5 or more. Depending on the case, prepare a cushioning material with two more board insertion grooves for the number of glass substrates to be packed,
Dummy substrates are inserted at both ends to protect the glass substrate inserted inside.

In the embodiment shown in FIG. 1, the substrate insertion groove 2 'on one side is not formed up to the corner. This is to enhance the flexibility at the corners of the cushioning material 1 of the present embodiment to facilitate attachment and detachment, and to drastically reduce the generation of dust. As described above, in the present invention, it is not necessary to form the substrate insertion groove up to the corner as long as the corner can protect the corner of the glass substrate.

When it is necessary to strengthen the fixing, at least one fixing member guide groove 3 for guiding a fixing member such as tape or rubber is provided as shown in FIG. Like, after inserting the cushioning material of the present invention on a glass substrate,
It is desirable to fix the fixation from the outside. However, the present invention is not limited to the embodiment shown in FIG.

The cushioning material of the present invention is formed by a polyolefin bead foam. Preferably, polyolefin is polyethylene or polypropylene. Specifically, Mef (registered trademark, manufactured by Asahi Kasei Corporation) is preferably used. In the present invention, the expansion ratio of the foam is at least 5 times or more, preferably 10 to 30 times. The compressive strength is 1.08 MPa (11 kgf
/ Cm ² ) or less. If the compressive strength exceeds 1.08 MPa, it is likely to be broken when dropped. Preferably 0.088-
0.304 MPa (0.9 to 3.1 kgf / cm ² ). If the pressure is 0.304 MPa or less, the breakage of the glass is drastically reduced, but if it is less than 0.088 MPa, permanent distortion is likely to occur due to the weight of the glass.

In the present invention, since a glass substrate is handled, it is preferable to add an antistatic agent. As the antistatic agent, those generally used can be used as they are, and, for example, ionic activators, nonionic activators, amphoteric activators and the like are suitably used. However, in the case of the surface coating type, since the antistatic performance is reduced by repeated use and cleaning with a cleaning liquid, it is preferable to use a kneaded bead foam in order to maintain the performance semipermanently. For example, Mef CB (registered trademark, manufactured by Asahi Kasei Corporation) is preferably used.

[0018]

As described above, the cushioning material of the present invention can easily and reliably protect and package a plurality of glass substrates. When the glass substrate is packed using the cushioning material of the present invention, the glass substrate and the cushioning material do not rub against each other, so that the electronic components on the glass substrate are prevented from being damaged. Furthermore, since the polyolefin is used, there is no effect of dust on the glass substrate, and the glass substrate can be reused after being cleaned, so that it is economical and very useful in view of environmental issues.

Further, in the cushioning material of the present invention, the substrate insertion groove has a shape in which the glass substrate is easily inserted and is hardly damaged, and the damage generates dust, and the glass substrate is transported without being fixed. Thus, an accident that the glass substrate is damaged is prevented.

The cushioning material of the present invention can be used for a wide variety of glass substrates. In particular, in the field of liquid crystal, which has been remarkably developed recently, especially, a TFT substrate in which a thin film transistor (TFT) is formed has a production level yield. However, the use of the cushioning material of the present invention can prevent the TFT substrate from being damaged during transportation and increase the yield.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a cushioning material of the present invention.

FIG. 2 is a perspective view of one embodiment of the package of the present invention using the embodiment of the present invention shown in FIG. 1;

FIG. 3 is a diagram showing a use state of a conventional cushioning material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Buffer material 2 and 2 'board insertion groove 3 Fixture guide groove 21 Glass substrate 22 Fixture 31 Buffer material

Claims (2)

[Claims] 1. A cushioning material for packing one set of four polyolefin bead foams having an expansion ratio of at least 5 times and a compressive strength of 1.08 MPa or less, and having a cross section of a corner of a glass substrate. A plurality of substrate insertion grooves having a depth of 2 to 10 mm for fixing two side edges forming corners of the glass substrate are provided on the inner side along the L shape according to the shape; Characterized in that the side wall is curved outward of the groove near the opening of the groove. 2. A plurality of substrates are arranged in parallel at a predetermined interval to form a cube, and the corners of each substrate are inserted into the substrate insertion grooves of the cushioning material according to claim 1 to form a contact with the substrate surface. A package, wherein four sides of the cube, which are orthogonal to each other, are fitted and fixed by the cushioning material.