JP2000128246A - Packing material and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a packing material serving both as a protecting member and a cushioning member by including a plurality of kinds of protrusions which are different in shape on a sheet. SOLUTION: Elliptical protrusions 102, 103 are mixed in typical cylindrical protrusions 101 with directions of arrays are varied. Both longitudinal force and lateral force can be supported by directional arrangement such as the protrusions 102, 103. Protrusions located on the right side on a sheet are less likely to deform than those on the left side. A plurality of kinds of protrusions that are different in degrees of deformation due to directions of force applied, thereby providing an air cap sheet having cushioning characteristics different from those of a normal air carrier sheet. Coexistence of the plurality of kinds allows complementarily optimum cushioning characteristics to be exhibited, thereby increasing a range of effective cushioning characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing material, and more particularly to a structure of an air cap having excellent cushioning characteristics and a method of manufacturing the same.

[0002]

2. Description of the Related Art An air cap sheet is frequently used as a packing material for packing precision instruments and components thereof. The air cap sheet is a sheet made of a synthetic resin such as vinyl, and has a large number of projections of the same shape containing air on its surface. Usually, the projections are cylindrical and are evenly arranged on the entire surface of the sheet. By wrapping precision equipment and the like with this air cap sheet, packaging without gaps can be performed without damaging the precision equipment and the like. That is, the air cap sheet can be used as a protective member for precision equipment.

On the other hand, a property required as a packaging material for precision equipment is a shock absorbing ability as a cushioning member. For stable use of precision equipment such as computers, measures against impact during transportation are important. Styrofoam is one of the packing materials having this property. When a packaged precision device receives an impact due to a drop or the like, the shock absorbing member made of Styrofoam is deformed or broken to absorb the impact, so that the impact does not reach the internal precision device. Can be.

FIG. 8 is a diagram showing a correlation between an impact area and an impact value when an impact is applied to the cushioning member. As can be seen from this figure, when the area receiving the impact is small, the impact applied thereto increases. Also, if the area receiving the impact is large, the pressure applied to the cushioning member is dispersed,
Since the deformation of the buffer member is unlikely to occur, the shock is not absorbed. As a result, the impact value is rather increased in a rebounding manner. The receiving area having the optimum value can absorb the energy of the impact by deforming the cushioning member over a certain period of time when the impact is received, so that the impact value can be minimized. In order to enhance the shock absorbing capacity, it is necessary to consider the characteristics of the cushioning member and the area of the shock receiving member.

However, the conventional air cap described above
The sheet has no such shock absorbing ability and cannot be used as a cushioning member. This will be described below with reference to FIG. FIG. 9 shows a conventional air cap sheet 802.
FIG. 13 is a cross-sectional view showing a state in which the device 801 is wrapped in the device and impact is applied thereto. When an impact is applied, the device 801 pushes the air cap sheet 802. If a proper receiving area is secured, the projections 803 of the air cap sheet 802 should be deformed by this force so that the side portions expand as shown by the dotted line, and try to absorb the impact. However, the air cap sheet 802 has a large contact area with the precision equipment to be wrapped and an excessive receiving area when packing, so that the projection 803 containing air is deformed and does not absorb the energy of impact. , On the contrary, it rebounds. Therefore, the impact force is directly transmitted to the inside of the device 801,
The possibility of destroying the inside is high. On the other hand, in the cushioning member made of Styrofoam, the Styrofoam received the impact, and the Styrofoam deformed over time, so that the energy of the impact could be absorbed. In fact,
By utilizing each characteristic, packing is often performed using both an air cap sheet and styrofoam.

Conventionally, packing is performed by combining packing members having different properties as described above. However, in order to cope with recent environmental problems, there is an increasing demand for reducing extra packing and packaging as much as possible. . In particular, Styrofoam may cause environmental pollution, and we want to reduce its use as much as possible. In addition, the cost of materials can be reduced by reducing extra packaging and packaging, and the cost of transportation and storage can be reduced by reducing the size of the product packaging. These demands can be met if there is a packing material having both the properties as a protection member and the properties as a cushioning member.

However, the conventional air cap sheet alone does not have the properties as a protective member and the properties as a cushioning member as described above. In addition, a conventional air cap sheet is a mold for preparing two resinous sheets and providing protrusions of the same shape on the first sheet. The first sheet is deformed and bonded to the second sheet. However, in this method, it is difficult to manufacture a packing material having both properties as a protective member and properties as a cushioning member.

[0008]

The prior art described above has a problem that the air cap sheet has no shock absorbing ability and cannot be used as a cushioning member. In addition, air cap with shock absorption capacity
It was also difficult to manufacture sheets. Then, this invention is made in order to solve the said problem, and an object of this invention is to provide the packaging material which had the property of the protection member and the buffer member, and its manufacturing method.

[0009]

SUMMARY OF THE INVENTION The present invention provides a seat,
A plurality of types of protrusions having different shapes are provided on the sheet. According to such a configuration, it is possible to provide a packing material having the properties of the protection member and the cushioning member. Further, the present invention is characterized by comprising a sheet and a plurality of types of protrusions having different heights from the sheet surface. According to such a configuration, it is possible to provide a packing material having the properties of the protection member and the cushioning member. Further, the present invention is characterized in that a sheet and a plurality of types of protrusions having different shapes are provided, and the plurality of types of protrusions having different shapes are arranged in a row for each predetermined type. According to such a configuration, it is possible to provide a packing material having the properties of the protection member and the cushioning member. Further, the present invention includes a sheet and a plurality of types of protrusions having different shapes,
A plurality of types of protrusions having different shapes are alternately arranged. According to such a configuration, it is possible to provide a packing material having the properties of the protection member and the cushioning member.

Further, according to the present invention, there is provided a mold having a plurality of types of projections having different shapes on a surface in contact with a sheet, and a step of deforming a predetermined position on the first sheet into a plurality of types of projections. Bonding the first sheet and the second sheet. In this way, it is possible to provide a method of manufacturing a packaging material having both properties of the protection member and the cushioning member.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the shape of a projection arranged on an air cap sheet according to the first embodiment of the present invention. 101 to 103 are projections of the air cap sheet. The conventional air cap sheet has projections of the same shape, but in the present embodiment, the conventional cylindrical projection 101 is replaced with the oval projection 1.
02 and 103 are mixed, and the direction of arrangement is changed. The directional arrangement of the projections 102 and the projections 103 can cope with both the vertical force and the horizontal force in FIG.

FIG. 2 is a sectional view showing a case where an impact is applied to a state where the device is wrapped around the sheet shown in FIG. 1 (FIG. 1).
(Cross section along line AA '). 201 is a device, 202 is an air cap sheet, 203 and 204 are air cap sheets.
These are protrusions on the sheet 202. The protrusion 204 on the right is less likely to deform than the protrusion 203 on the left of the sheet 202. By arranging a plurality of types of protrusions having different degrees of deformation on the sheet depending on the direction in which the force is applied, an air cap sheet having a different cushioning property from the conventional air cap sheet can be obtained. The coexistence of a plurality of shapes enables the optimum buffer characteristics to be complementarily exhibited, and the range of effective buffer characteristics to be expanded. This eliminates the need to combine the air cap sheet and the styrofoam packaging material, which helps to reduce the number and types of members. There is no need to prepare air cap sheets having different shapes for devices having different shapes and weights, which is advantageous from the viewpoint of common use of parts and members.

A second embodiment will be described below with reference to the drawings. FIG. 3 is a perspective view showing a shape of a protrusion arranged on an air cap sheet according to the second embodiment of the present invention. Reference numeral 301 denotes a protrusion having a low height from the sheet, and 302 denotes a protrusion having a high height from the sheet. Two types of protrusions having different heights are arranged on the sheet. The lower projection 301 in the innermost row, and the higher projection 30 in the next row in front.
2. The lower projections in the next row before that are alternately arranged for each row. Similarly, FIG. 4 shows an example in which two types of protrusions having different heights are arranged on a sheet. Here, unlike FIG. 3, instead of arranging different types of protrusions line by line, a protrusion 401 having a lower height from the sheet, a protrusion 402 having a higher height from the sheet, a lower protrusion, a higher protrusion,
And are staggered.

FIG. 5 is a sectional view of the sheet when two types of protrusions having different heights are arranged as described above. 501 is an air cap sheet, 502 is a high protrusion, 50
3 indicates a low protrusion. In this case, the height of the high protrusion 502 is desirably about twice the height of the low protrusion 503 so that the high protrusion is easily buckled. A case where an impact is applied to a state where the device is wrapped by the sheet 501 will be described below with reference to FIG. FIG. 6 is BB 'in FIG.
FIG. 5 is a cross-sectional view taken along a line or a line CC ′ in FIG. 4. 6
01 is a device. Reference numeral 602 denotes an air cap sheet having a high protrusion 603 and a low protrusion 604.
When the device 601 receives an impact in the downward direction, it first hits the tall protrusion 603. The receiving area in this case is about half that of the conventional air cap sheet in which the size of the projection is uniform as shown in FIG. When a shock is applied and the high protrusion 603 buckles as shown in FIG. 6, the shock can be absorbed over time. If the buckling further proceeds after this, as shown in FIG.
04 participates in shock absorption. It has a higher shock absorption capacity than the conventional air cap sheet that has had instantaneous rebound.

In order to make the tall protrusions easily buckle, it is desirable that the tall protrusions have a height that is at least twice the diameter of a circular cross section of the protrusion. When the cross section of the projection is rectangular, the short side 2
It is desirable to have a height more than double. If the height is at least twice as long as the short side, it becomes easy to buckle to the long side.

It is also possible to absorb the impact by bursting the tall protrusion without buckling the tall protrusion. To this end, it is desirable to deliberately lower the strength of the high protrusion to make it easier to burst. In fact, when manufacturing such an air cap sheet, trying to make low and high protrusions with the same bottom area,
The higher the protrusion, the greater the elongation of the material during processing, and the thinner the resin of the material. As a result, the higher protrusions have lower strength, and it is possible to produce a packaging material having a different strength of the protrusions.

Further, as a combination of the first embodiment and the second embodiment, it is of course possible to arrange a plurality of types of protrusions having different cross-sectional shapes and heights on the sheet. In this case, it is desirable to arrange a plurality of types of protrusions on the sheet so as to satisfy the shock absorbing ability and the protective ability required according to the type of the object to be packed.

In order to manufacture an air cap sheet having a plurality of types of protrusions arranged on the sheet, a surface of the mold for manufacturing an air cap sheet which has a different shape is used for a surface in contact with the sheet. A plurality of types of projections are formed. After the first sheet is brought into contact with the mold while maintaining the heated state, a predetermined position of the first sheet is extruded or sucked using a pressure difference or the like to form an elongated protrusion, The air cap is attached by laminating with the second sheet.
A sheet is manufactured. As an example of the packing material, the embodiment of the air cap sheet has been described. In addition to the protrusions containing air, a plurality of types of protrusions having different shapes are formed of a gel-like shock absorber to form a plurality of protrusions having different shapes. It is also possible to arrange in.

[0019]

As described above, according to the present invention, it is possible to provide a packing material having both properties of a protective member and a cushioning member.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an air cap sheet according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a case where an impact is applied to the air cap sheet according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a protrusion arrangement of an air cap sheet according to a second embodiment of the present invention.

FIG. 4 is a perspective view showing another protrusion arrangement of the air cap sheet according to the second embodiment of the present invention.

FIG. 5 is a cross-sectional view of an air cap sheet according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing a case where an impact is applied to an air cap sheet according to a second embodiment of the present invention.

FIG. 7 is a sectional view showing a case where an impact is applied to an air cap sheet according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a correlation between an impact receiving area and a magnitude of an impact received.

FIG. 9 is a sectional view showing the operation of a conventional air cap sheet.

[Explanation of symbols]

100: air cap sheet, 101: protrusion, 10
2 Projection, 103 Projection, 201 Device, 202 Air cap sheet, 203 Projection, 300 Air cap sheet, 301 Low projection, 302 High projection, 400 Air cap sheet, 401 Low Projection, 402: high projection, 501: air cap sheet, 502: high projection, 503: low projection, 601: device, 602: air cap sheet, 603: high projection, 604: low projection, 801: device, 802 ... air cap sheet, 803 ... protrusion

Claims (10)

[Claims] 1. A packing material comprising: a sheet; and a plurality of types of protrusions having different shapes on the sheet. 2. The packing material according to claim 1, wherein said projection is hollow and contains gas. 3. The packing material according to claim 1, wherein the projection is made of a gel material having a shock absorbing ability. 4. A packing material comprising: a sheet; and a plurality of types of protrusions having different heights from the sheet surface. 5. The height of a projection having the highest height among a plurality of types of projections having different heights from the sheet surface is at least twice the diameter of the projection when the cross section of the projection is circular. 4. The packing material according to claim 3, wherein the packing material has a height. 6. A height of a projection having the highest height among a plurality of types of projections having different heights from the sheet surface is twice as long as a short side thereof when the cross section of the projection is rectangular. The packing material according to claim 3, wherein the packing material has the above height. 7. The packing material according to claim 1, wherein the plurality of types of projections having different shapes have different thicknesses of the material forming the projections depending on the type. 8. A packing material comprising: a sheet; and a plurality of types of protrusions having different shapes, wherein the plurality of types of protrusions having different shapes are arranged in rows for each predetermined type. 9. A packing material comprising: a sheet; and a plurality of types of protrusions having different shapes, wherein the plurality of types of protrusions having different shapes are alternately arranged. 10. A step of deforming a predetermined position on the first sheet into a plurality of types of protrusions by using a mold having a plurality of types of protrusions having different shapes on a surface in contact with the sheet;
Bonding the sheet to the second sheet.