WO2002092470A1

WO2002092470A1 - Buffer

Info

Publication number: WO2002092470A1
Application number: PCT/JP2002/004536
Authority: WO
Inventors: Yoshihito Fukasawa; Takeshi Saito
Original assignee: Asahi Kasei Kabushiki Kaisha
Priority date: 2001-05-11
Filing date: 2002-05-09
Publication date: 2002-11-21
Also published as: JP2005231628A

Abstract

A buffer, wherein at least one rectangular opening part passed through in a thickness direction, projected parts obtained by cutting the polyolefin foam plate in a trapezoidal shape coming into contact with the end sides of the opening part, and hinge parts obtained by leaving uncut only the contact sides of the end sides of the opening part with the trapezoidal shapes of the polyolefin sheet are provided in a buffer plate formed of a polyolefin foam plate of 15 to 100 mm thick and a polyolefin sheet of 5 mm thick or less stacked on each other, and the projected parts are raised onto the sheet surface of the buffer plate by rotating the projected parts around the hinge parts to fit the buffer to a packaged body through fitting parts formed of hollow parts in the buffer plate formed after the projected parts are extracted and the opening part adjacent to the hollow parts, characterized in that at least one of the trapezoidal shapes comes into contact with the end sides of the opening part at the longer side center part thereof.

Description

Buffer body technical field

TECHNICAL FIELD The present invention relates to a cushioning member interposed between a packaged body and an outer box for storing the packaged body, absorbing an external force such as an impact, and protecting the packaged body. Light

Background Technology ·

2. Description of the Related Art Conventionally, a combination of a cushion and an outer box has been used for packaging of electric devices such as audio devices, televisions, and personal computers. The shock absorber is interposed between the outer package and the package, such as the electrical equipment, and absorbs external force when subjected to external force such as impact, so that it absorbs external force, and It is a member that protects the body. As a cushioning material, a foamed plastic molded article, which is a lightweight material having a good cushioning ability, is widely used. The shape of the cushion made of a foamed plastic molded body is appropriately selected depending on the weight and shape of the package, but usually, it has an opening or a concave portion for fitting the package, and a pair of opposed bodies is used. Many are used as a set or as a set arranged at each of the four corners of the package. In general, such a buffer is manufactured by a method of integrally molding by foaming in a mold using a mold having a desired shape, a method of cutting a plurality of portions from a plate-like foam, and heat-sealing and bonding. The method includes a method of adhering with an agent and integrating it into a buffer having a desired shape.

However, the method of integrally molding the above-mentioned cushioning body by foaming in a mold is economically inefficient because it is necessary to individually produce dies corresponding to the shape of the packaged object. In addition, the method of cutting and bonding each part to form an integral part is complicated.

Furthermore, in recent years, recycling of resources has been required from the environmental point of view such as effective use of resources and reduction of garbage. However, conventional foamed plastic molded cushions are bulky. The efficiency of transportation and storage of the equipment itself was low, and this was a problem for reuse.

As a means to solve the above-mentioned problems, Japanese Patent Publication No. 突出 has a rectangular opening penetrating in the thickness direction of the buffer plate composed of a skin layer laminated on the surface thereof, and a projection formed by cutting a core into a trapezoidal shape in contact with the opening; A cushion having a hinge region formed by leaving a skin only on a side (long side of a trapezoid) opposite to a tangent side of a trapezoid and an opening is disclosed. Here, the trapezoid is in contact with the edge of the opening at the short side. When the protrusion is rotated 90 degrees about the hinge region, the protrusion can be caused from the center of the opening toward the outside of the opening, and a storage site is formed. (Hereinafter, this shape may be called an outer hinge.)

However, this cushion has a disadvantage in that since the hinge region has a long length, a strong force is required to cause the protrusion from the cushion plate, and the operation takes time. In addition, since the hinge area is near the end of the storage area, the high-density foam sheet (skin layer) at the protrusion is located at both ends of the storage area, and the low-density foam sheet (core layer) is at the center of the storage area. It will be closer to you. Therefore, if a strong force is applied to the product receiving surface of the protruding part (for example, when the protruding part is installed facing the bottom), the low-density sheet part is more likely to be dented than the high-density part and is damaged earlier. There was a problem that the performance declined quickly in response.

An object of the present invention is to solve the above-mentioned problems and to provide a buffer having excellent buffering ability and easy to manufacture. Disclosure of the invention

The buffer of the present invention is a buffer plate in which a polyolefin foam plate having a thickness of 15 to 10 O mm and a polyolefin sheet having a thickness of 5 mm or less are laminated,

At least one rectangular opening through the thickness,

A protruding portion obtained by cutting the polyolefin foam plate into a trapezoidal shape in contact with an edge of the opening;

Hinge part in which the polyolefin sheet is left only at the tangent between the edge of the opening and the trapezoid.

By rotating the protruding portion about the hinge portion as a central axis, the protruding portion is caused on the sheet surface of the buffer plate, and the buffer after the protruding portion comes off: the cavity of the plate. And a buffer for fitting to the packaged body by a fitting portion composed of a portion and an opening adjacent to the hollow portion,

At least one of the trapezoids is in contact with an edge of the opening at a central portion of a long side thereof. (Hereinafter, this shape may be called the inner hinge.)

In the present invention, among the two sets of opposed sides of the opening, the openings are formed in a plurality of broken lines crossing the buffer plate constituting at least one set of the sides, and the breaks of the adjacent broken lines are alternated. As a preferred embodiment, a configuration in which a cut portion penetrating through the buffer plate is provided so as to be disposed at the same position.

Further, in this configuration, the solid line portion of the dashed line has a mountain shape bent or curved at a central portion, and the notches are formed such that the bending or bending directions are equal within the same dashed line, and are opposite in adjacent dashed lines. A configuration in which a portion is formed is also included as a preferred embodiment.

In the present invention, a foamed sheet having a thickness of l to 5 mm or an unfoamed sheet having a thickness of 10 to 500 / m is preferably used as the polyolefin sheet.

The expansion ratio of the polyolefin foam plate is preferably 20 to 50 times, and when a foam sheet is used, the expansion ratio is preferably 5 to 15 times. A feature of the shock absorber of the present invention is that an opening is formed in a shock absorbing plate obtained by laminating a sheet on a foamed plate, and a trapezoidal projection is formed adjacent to the opening to leave a part of the sheet. When cutting, the center of the long side of the trapezoid was formed so as to be included in the edge of the opening. BRIEF DESCRIPTION OF THE FIGURES

1A to 1C are views showing an embodiment of the buffer of the present invention.

FIG. 2 is a diagram showing an example of a combination in a case where the buffer of FIG. 1 is used.

FIG. 3 is a diagram showing an example of a package using the buffer of FIG.

FIG. 4 is a view showing another embodiment of the buffer of the present invention.

FIG. 5 is a view showing another embodiment of the buffer of the present invention.

FIG. 6 is a view showing another embodiment of the buffer of the present invention. FIG. 5 is a view showing another embodiment of the buffer of the present invention.

FIG. 8 is a curve showing instantaneous maximum strain characteristics in a drop test of a buffer plate that can be used for the buffer of the present invention.

FIG. 9 is a curve showing dynamic impact characteristics of a shock-absorbing plate used in the shock-absorbing body of the present invention in a drop test. BEST MODE FOR CARRYING OUT THE INVENTION

The shock absorber of the present invention is basically constituted by using a shock absorbing plate obtained by laminating a polyolefin sheet on a polyolefin foam plate.

The polyolefin foam board and the polyolefin sheet used in the present invention are both molded articles of a polyolefin resin, preferably of polyethylene and polypropylene. More preferably, polyethylene containing both uncrosslinked and crosslinked polyethylene is preferably used. If the emphasis is on reusing the buffer for another product, it is advantageous to use uncrosslinked polyethylene. On the other hand, when it is desired to increase the resistance of the hinge portion to repeated bending, crosslinked polyethylene is preferred. In addition, by using a polyolefin foam plate and a polyolefin sheet of the same material, the foam and the sheet can be easily laminated by heat fusion, and the laminate can be reused for another product. This eliminates the need to separate the foam board and the sheet, which is advantageous.

The expansion ratio of the polyolefin foam board used in the present invention is preferably 20 to 50 times, and the thickness thereof is 15 to 10 O mm, preferably 20 to 60 mm.

Further, as the polyolefin sheet used in the present invention, either a foamed sheet or an unfoamed sheet is preferably used. As described later, since the hinge portion formed by the sheet needs to exhibit good flexibility and strength, when an unfoamed sheet is used, the thickness of the sheet is in the range of 10 to 500 μπι. It is preferred that When a foamed sheet is used, a sheet having a thickness of l to 5 mm and an expansion ratio of 5 to 15 times is preferable in order to obtain a good buffering capacity in addition to the above flexibility.

The above polyolefin foam plate and polyolefin foam sheet are bead foam molded And extrusion foaming. The polyolefin unfoamed sheet is preferably formed by extrusion or the like. In any case, the molding method is not particularly limited.

For laminating the polyolefin foam plate and the polyolefin sheet, as described above, a method of laminating the same material by heat fusion is preferable. Further, the lamination may be performed by laminating both members using a heat-sensitive adhesive or a reaction-curable adhesive.

The shock absorber of the present invention is manufactured by providing at least one rectangular opening penetrating in the thickness direction in the shock absorbing plate, and cutting the trapezoidal protrusion in contact with the opening. Here, the projecting portion trapezoid with respect to the edge of the opening is arranged such that the center of the long side of the two parallel sides facing each other of the trapezoid is in contact with the edge of the opening. The embodiment will be specifically described below.

1A to 1C are diagrams showing an embodiment of the inner hinge type of the shock absorber of the present invention. 1A is a plan view, FIG. 1B is a cross-sectional view taken along a line AB in FIG. 1A, and FIG. 1C is a cross-sectional view taken along a line AB with a protruding portion 5 shown in the drawing. In the figure, 1 is a buffer of the present invention, 2 is a buffer plate, 3 is an opening, 4 is an edge of the opening, 5 is a protruding portion, 6 is a short side of the protruding portion 5, 7 is a cutout portion, 8 is the long side of the protrusion 5, 9 is the side of the protrusion 5, 11 is the polyolefin foam plate, 12 is the polyolefin sheet, 13 is the cavity, and 14 is the gap. The buffer 1 of the present invention has, as a basic configuration, at least one rectangular opening 3 penetrating in the thickness direction in a buffer 2 formed by laminating the polyolefin foam plate 11 and the polyolefin sheet 12 described above. In a plane parallel to the surface of the buffer plate 2, a trapezoidal protruding portion 5 in which a pair of opposite sides 4 of the opening 3 is part of the center of the lower bottom (long side) is cut. It is formed by processing. In the shock absorber of the present invention, of the opposing parallel sides of the protruding portion 5 having a trapezoidal planar shape parallel to the surface of the shock absorbing plate 2, the long side 8 is in contact with the opening 3, and both ends of the long side 8 The central portion excluding the vicinity constitutes a pair of opposite sides 4 of the opening 3. The protruding portion 5 is formed by cutting the buffer plate 2 into such a trapezoidal shape. 2 is not cut, and on the side 9 connecting the short side 6 end and the long side 8 end, both the foam plate 11 and the sheet 12 are cut. That is, the protruding portion 5 is connected to the buffer plate 2 main body by the sheet 12 in the vicinity of both ends of the long side 8.

When using the buffer 1 of the present embodiment, as shown in (c), the uncut sheet 12 near both ends of the long side 8 of the protruding portion 5 is used as a hinge portion, and the sheet 1 2 Rotate the protrusion 5 9 °° while bending it 90 ° outward, and pull it up from the buffer plate 2. The raised protrusion 5 remains connected to the two buffer plates by the hinge sheet 12. Although the foam plate 11 is cut at the hinge portion, since the sheet 12 and the foam plate 11 are laminated and integrated by heat fusion or the like, the sheet 12 is bent outward. However, since the cutting of the foam plate 11 does not reach the sheet 12, the sheet 12 has high hinge strength.

The sheet 12 bent at the hinge portion tries to return to the original position by the restoring force and presses the protruding portion 5 in the direction of the shock absorbing plate 2, but the protruding portion 5 has a thickness corresponding to the thickness of the end of the long side 8. The buffer plate 2 that protrudes from the end of the long side 8 toward the end of the short side 6 in an inverse tapered shape to form the side 9 is blocked by the main body, and cannot return to the cavity 13 and is raised outward. In this state, it is substantially fixed to the buffer plate 2 main body. When the protruding portion 5 is raised, contrary to the above, the thickness of the end of the long side 8 is hindered by the buffer plate 2 main body forming the side 9. Since the buffer is composed of a polyolefin foam 11 having high flexibility and elasticity and a polyolefin sheet 12 having excellent flexibility and raw material, the protrusion 5 is formed so as to be convex to the long side 8 side. In addition, it is possible to cause the protrusion 5 by compressing and deforming the end of the protrusion 5 or Z or the end of the protrusion 5 or the main body of the buffer plate 2. After the bow I is raised, the protruding portion 5 and the buffer plate 2 main body can return to their original shapes due to the good restoring force of the foam plate 11. Further, in the same manner, the protruding portion 5 and the buffer plate 2 can be appropriately compressed or radiused, and the once protruding protruding portion 5 can be housed in the hollow portion 13 and returned to a low-bulk plate shape. That is, when packing the object to be packed, the protruding portion 5 can be formed to have a shape protruding outside the buffer plate 2, and can be formed into a low-bulk plate shape when stored and transported when not in use.

Further, in the shock absorber 1 of the present embodiment, the notch 7 is provided in the center of the short side 6 of the protrusion 5 so that the protrusion 5 is caused from the buffer plate 2 or the cavity is formed. When stored in 13, the protruding part 5 becomes easier to bend, making the work easier be able to. Also, as shown in FIGS. 1A to 1C, by forming a gap 14 between the short side 6 of the protrusion 5 and the main body of the buffer plate 2, the protrusion 5 can be easily caused or stored. Can be

FIG. 2 is a perspective view showing a combination when the packaged object is packed using the cushioning bodies of FIGS. 1A to 1C. FIG. 3 is a perspective view of a package in which the packaged object 51 is packed with the cushioning bodies of FIGS. 1A to 1C. As shown in FIGS. 2 and 3, the buffer 1 of the present invention is basically used as a pair in a pair, and at least the cavity 1 after the protrusion 5 is raised from the buffer 2. The body to be packed 51 is fitted from both sides by a fitting portion including the opening 3 and the opening 3 adjacent to the cavity 13. Usually, in this state, it is further stored in an outer box such as cardboard, and stored and transported.

As is clear from FIG. 2, since the protrusion 5 rotates 90 ° when raised from the buffer plate 2, the support surface of the protrusion 5 that is supported in contact with the packaged object 51 is a loose type. This is the cut surface of plate 2. That is, the protruding portion 5 supports the packaged object 51 by the surface on which the foam plate 11 and the sheet 12 are arranged in parallel. Also, the foam plate 11 and the sheet 12 are arranged in parallel on the side surface of the short side 6 of the protruding portion 5 in contact with the outer box. Therefore, when an external force is applied to the package, stress is applied in the direction of the plane in which the foamed board 11 and the sheet 12 are arranged in parallel, so that the foamed board 11 and the sheet 12 are stacked in the stacking direction. Higher buffering capacity can be obtained compared to a case where the package is supported, or a case where the packaged object is supported only by the foam plate having the same thickness as the buffer plate 2. This effect is particularly remarkable when a foam sheet is used as the sheet 12.

The cushioning body of the present invention is manufactured by cutting the buffer plate 2 from a laminate (raw material) obtained by laminating the foamed plate 11 and the sheet 12 and simultaneously cutting the opening and the protruding portion. For the cutting, a method such as press punching, which is generally used for cutting a foam, can be used. In this step, the cutting of the protruding portion of the protruding portion, which cuts only the foamed board but does not cut the sheet (ie, the vicinity of both ends of the long side of the protruding portion forming the hinge portion) is performed by cutting the portion to be completely cut By using a cutting blade having a different height from the cutting blade used for cutting, cutting can be performed simultaneously with other parts.

In the cushion of the present invention, the trapezoidal shape, which is the planar shape of the protruding portion, refers to the long side end. Any shape may be used as long as the length in the direction parallel to the long side gradually decreases from the force toward the short side end. Therefore, as shown in FIGS. 1A to 1C, a trapezoid in which the side 9 is constituted by a combination of straight lines having different inclinations as shown in FIG. . Further, embodiments in which the side 9 is a curve are also included in the present invention.

In addition, in the shock absorber of the present invention, as shown in FIGS. 1A to 1C, each of the protrusions 5 is basically formed in contact with a pair of opposite sides 4 of the opening 3. The parts 5 may have the same shape or different shapes. Further, as shown in FIG. 5, the position of the hinge portion may be changed between left and right. By adopting such a configuration, it is possible to cope with the case where the shape is limited by adjusting the position of the hinge portion. Further, in the present invention, the number of openings 3 is not limited to one. For example, the present invention includes a form in which two or more openings 3 each having a protruding portion 5 are provided, and two or more to-be-packaged bodies can be packed at the same time by a set of buffers. Further, for example, two or more openings are provided, one protrusion 5 is provided between each adjacent opening, and a plurality of openings are formed such that a cavity formed when the protrusion 5 is caused is adjacent to the opening 5. A form in which one fitting part is formed integrally with the above is also preferably applied. In particular, in this aspect, when the object to be packed is a flat plate and the shape of the fitting portion is extremely long, the protrusion can be arranged in the middle of the fitting portion, so that the buffering capacity is increased. At the same time, the strength of the buffer itself can be increased.

Furthermore, as shown in FIGS. 1A to 1C, the flexibility and strength of the shock absorber of the present invention can be adjusted by appropriately forming notches 15 in the shock absorber plate 2 main body. is there.

Furthermore, as shown in FIG. 2, the buffer of the present invention is used as a pair of opposing pairs, but the pair may have the same shape or different shapes. A buffer having a different shape, a buffer having a different hinge shape, or the like may be used in combination depending on the shape of the packaged object.

Further, in the cushioning material of the present invention, a sheet similar to the sheet 12 is laminated on a surface of the foam plate 11 opposite to the surface on which the sheet 12 is laminated and on a side surface of the foam 11. However, it is possible to adjust the buffer capacity and strength. Further, in the present invention, by providing a plurality of cut portions in the buffer plate 2 to impart elasticity, the volume of the buffer when not in use can be further reduced. As a result, the convenience of collecting and repeatedly using the buffer can be improved. Figure 6 shows a specific example. In the figure, reference numeral 101 denotes a cut portion penetrating the buffer plate 2 in the thickness direction, and at least a pair of end sides 4 a and 4 c of two pairs of opposite sides 4 a to 4 d of the opening 3. Alternatively, the buffer plate 2 forming 4b and 4d is provided with a dashed cut portion 101. FIG. 6 shows an example in which cut portions are provided in both pairs. The cut portions 101 are formed in a plurality of broken lines crossing the buffer plate 2, and the breaks of adjacent broken lines are alternately arranged. The broken line may be a direction orthogonal to the edges 4a to 4d or a direction obliquely intersecting the edges 4a to 4d.

When the buffer plate 2 provided with such a plurality of cut portions 101 is pulled so as to expand the cut portions 101 in the directions of arrows 102 and 103, the buffer plate 2 expands in a mesh shape, The substantial flat area of the fitting portion can be increased. When not in use, the mesh can be shrunk again to easily return to the original volume, so the volume reduction effect when not in use is high. In addition, the buffer in the opening 3 is normally discarded, but in this configuration, the opening 3 itself can be made smaller as compared with a mode in which the notch 101 is not provided, so that the volume of the buffer to be discarded is reduced. Economic efficiency.

Further, it is also preferable that the cutout portion 101 in FIG. 6 be bent or curved at the central portion so as to be easily expanded. FIG. 7 shows an embodiment in which the cut portion 101 is bent. FIG. 7 is a partial plan view of the shock absorber of the present invention having a chevron-shaped cut portion 101 ′. That is, as shown in FIG. 7, the solid line portion of the broken line is formed into a mountain shape bent or curved at the center, and the bending or bending direction is the same within the same broken line, and the direction is opposite in the adjacent broken line. A notch 1 0 1 ′ is formed.

Example 1

Using two types of dummies with different weights as the packaged objects, and two types of cushions of the present invention formed using two types of shock absorbing plates for each dummy, repeatedly dropping in the packed state, impact The durability of the hinge portion was evaluated by a test to which the following was added.

(Buffer plate)

Uncrosslinked poly with 50 mm thickness and 25 times expansion ratio as polyolefin foam board Ethylene foam board (“Suntech Foam” manufactured by Asahi Kasei Corporation) is used as a polyolefin sheet. Two types of cross-linked polyethylene foam sheets with a thickness of 3 mm and an expansion ratio of 10 × and 15 × (“Softlon” manufactured by Sekisui Chemical Co., Ltd.) Was used. The two sheets were thermally fused to the foam board, respectively, to produce two buffer boards a and b.

[Dummy]

Medium weight dummy: 12.6 kg, 45 OmmX 252mmX 1 14mm

Weight dummy: 6.6 kg, 33 OmmX 227mmX 103 mm

(Buffer)

Loose type ί Body A (for medium weight dummy, inner hinge type, planar shape shown in Fig. 4)

In the plane shape of Fig. 4,

Maximum external dimensions of shock absorbing plate 2: 469 mm X 224 mm

Length of long side 8 of protrusion 5: 194 mm, length of short side 6: 174 mm, distance between long side 8 and short side 6: 46 mm

Opening 3 dimensions: 22 OmmX 1 14mm

Buffer B (for lightweight dummy, inner hinge type, planar shape shown in Fig. 1)

In the plane shape of Fig.

Maximum external dimensions of shock absorbing plate 2: 328 mm X 191 mm

Length of long side 8 of protrusion 5: 153mm, length of short side 6: 103mm, distance between long side 8 and short side 6: 38mm

Opening 3 dimensions: 1 27mmX 103mm

(Drop test)

Using the above two types of buffer plates a and b, the above buffers A and B were produced. As shown in Fig. 5, the cushion was fitted to the dummy and stored in an outer box (A flute corrugated cardboard, JIS type 0201, JIS Z 1507-11989). The package was dropped in the following order with a drop height of 60 cm.

① Drop the package so that one corner of the package faces downward.

(2) The package was dropped so that the ridges forming the corners dropped in (1) above faced downward. Drops were performed on all three ridges in ascending ridge order.

(3) The package was dropped so that each side faces downward. The order of drop is right (buffer (The other side where the buffer was fitted), front, rear, ground, and heaven.

④ The above ③ was repeated 5 more times.

[Evaluation]

After evaluating the workability of the protrusion (sensory test) and the independence of the raised protrusion (sensory test) for each buffer, perform the drop tests (1) to (4) above, and evaluate the buffer after the test. The durability of the hinge was evaluated.

As a result, for all the shock absorbers, the workability of causing the shock and the independence of the protrusion were good. Also, regarding the hinge portion after the drop test, a crack in a direction parallel to the heat-bonded surface was formed at the boundary (heat-bonded surface) between the foamed plate and the sheet at the position where the shear force acts. Although there was a tendency to grow deeper with an increase in the number of drops, no damage occurred to the hinge connecting the protrusion to the buffer plate body. It is considered that the protruding part is not cut at the hinge part and loses its protective ability in practical use.

Example 2

Using the foam plate and the two types of buffer plates used in Example 1, their buffering capacity was evaluated.

〔Test pieces〕

As a test piece, a buffer plate having a thickness of 50 mm by cutting a foam plate on a side where no sheet is laminated and the foam plate used in Example 1 were used as they were. Next, a plurality of test pieces having a thickness of 5 mm and a different support surface area were cut out using a rectangle having a pair of sides in the thickness direction as a support surface.

〔Test method〕

The static stress was set to 0.02 to 0.2 kg / cm ² by changing the drop load of the plurality of test pieces. Place each test piece on an iron block with the support surface up and let the load fall freely from a height (distance from the support surface to the bottom of the load) of 60 cm to reduce the instantaneous maximum strain and dynamic impact characteristics. It was measured. The dynamic impact characteristics were measured with a G sensor fixed to the load.

[Evaluation]

The instantaneous maximum strain is the decrease in thickness when the specimen is compressed most in the drop test. The amount was expressed as a percentage of the original specimen thickness (50 mm). The dynamic impact characteristics were shown as a ratio (G) of the absolute value of the maximum acceleration in the drop test to the gravitational acceleration (g = 9.8 m / s ² ). Fig. 8 shows the instantaneous maximum strain with respect to static stress, and Fig. 9 shows the dynamic impact characteristics. In the figure, the solid line is a buffer plate (buffer plate a) using a sheet with an expansion ratio of 10 times, the broken line is a buffer plate using a sheet with a expansion ratio of 15 times (buffer plate b), and the dashed line is the sheet. It is a foamed board without using.

As shown in Fig. 8, the maximum instantaneous distortion of the buffer plate a, which uses a foam sheet, is smaller than that of the foam plate alone, and the thickness of the shock-absorbing plate required to prevent the bottom of the packaged projection Can be made thinner. Further, as shown in FIG. 9, when the static stress is in a practical range of 0.05 kg / cn ^ or more, the cushioning plate according to the present invention has a smaller maximum acceleration and has a higher foaming rate. It has a higher buffering capacity than a plate alone.

For comparison, a similar drop test was performed using the same foamed board and the loose-type boards a and b with the sheet surface as the supporting surface. There was almost no difference between the board and the mild ΐ board a, b. Therefore, it was found that the buffer capacity of the buffer body could be improved by using the cut surface obtained by cutting the foam plate and the sheet in the laminating direction as the support surface.

As described above, the following effects can be obtained in the shock absorber of the present invention.

(1) The protruding portion may be raised from the buffer plate when packing the packaged object. Since the protruding portion is stored in the buffer plate except when packing, the packing work, the storage and transportation of the buffer are required. Space can be saved, and the reuse efficiency is improved. In addition, since the length of the hinge portion is shorter than that of a known outer hinge type cushioning material, there is an effect that a pulling-up force can be reduced when pulling up the protruding portion.

Furthermore, since the hinge region is located parallel to the edge of the opening, the high-density sheet layer of the protrusion is located near the center of the fitting portion (the edge of the opening), and the low-density foam plate is placed in the high-density sheet. Exists on the outside of the sheet layer (near the end of the fitting part). Therefore, when a strong force is applied to the surface of the protruding portion that comes into contact with the object to be packed, a load can be received by the cooperation of the high-density sheet and the low-density foam board, so that the performance of the entire cushioning body is improved.

(2) When the protrusion is raised from the buffer plate, the protrusion is attached to the buffer plate body. Since it is substantially fixed through the flange portion, the packing operation is easy as in the case of a conventional integrally molded cushion. Further, the projecting portion does not move during the transportation of the package, so that the package can be reliably protected.

(3) Since the cushioning body of the present invention is manufactured by cutting a laminate of a foam and a sheet, it can be mass-produced quickly by press punching or the like. Further, since the same buffer plate can be used to form buffers having different shapes, the buffer of the present invention can easily cope with a design change and can be provided at low cost and quickly. Furthermore, various management such as confirmation of the number of members is easy.

(4) In the cushioning body of the present invention, since the packaged body is supported by the parallel arrangement of both the foam and the laminate of the sheet, a high buffering capacity is obtained, and the package is more reliably protected. Can be In addition, in the present invention, a buffer that is thinner or smaller than the conventional buffer and achieves the same buffer capacity as the conventional buffer can be used, so that the buffer and the package can be downsized. it can. In addition, by selecting the thickness and the expansion ratio of the foam and the sheet, it is possible to easily adjust the buffer capacity and the strength of the hinge portion. Therefore, it is particularly preferably used for packing a package to be easily damaged, a package to be packed with a high weight, or a package in a case where the conditions of a distribution channel are severe. Industrial applicability

The package of the present invention can be used for various packages of electrical equipment such as audio equipment, television, and personal computers.

Claims

The scope of the claims

1. In a buffer plate in which a polyolefin foam plate with a thickness of 15 to 100 mm and a polyolefin sheet with a thickness of 5 mm or less are laminated,

At least one through-thickness-loss opening,

A protruding portion obtained by cutting the polyolefin foam plate into a trapezoidal shape in contact with an edge of the opening; and

By rotating the protruding portion about the hinge portion as a central axis, the protruding portion is caused on the surface of the sheet of the loose metal plate, and the hollow portion of the cushioning plate after the protruding portion comes off. A buffer for fitting to a packaged body by a fitting portion constituted by an opening portion adjacent to the hollow portion,

At least one of the trapezoids is in contact with an edge of the opening at a central portion of a long side thereof.

2.Among the two sets of opposite sides of the opening, the openings are formed in a plurality of broken lines crossing at least one set of the ends, and the breaks of the adjacent broken lines are alternately arranged. 2. The shock absorber according to claim 1, wherein a cut portion penetrating the shock absorber plate is provided.

3. A solid line portion of the broken line is a mountain shape bent or curved at a central portion, and the cut portion is formed so that the bending or bending direction is equal within the same broken line, and is opposite in an adjacent broken line. 3. The buffer according to 2.

4. The polyolefin sheet is a foam sheet having a thickness of l to 5 mm.

4. The buffer according to any one of 1 to 3.

5. The buffer according to claim 4, wherein the expansion ratio of the polyolefin foam plate is 20 to 50 times, and the expansion ratio of the polyolefin sheet is 5 to 15 times.

6. The buffer according to any one of claims 1 to 3, wherein the polyolefin sheet is an unfoamed sheet having a thickness of 10 to 500 m.

7. The polyolefin foam plate according to claim 6, wherein the expansion ratio is 20 to 50 times. A buffer as described.