WO2004026726A1 - Materiau amortisseur - Google Patents

Materiau amortisseur Download PDF

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Publication number
WO2004026726A1
WO2004026726A1 PCT/JP2003/011920 JP0311920W WO2004026726A1 WO 2004026726 A1 WO2004026726 A1 WO 2004026726A1 JP 0311920 W JP0311920 W JP 0311920W WO 2004026726 A1 WO2004026726 A1 WO 2004026726A1
Authority
WO
WIPO (PCT)
Prior art keywords
skin layer
hot
foam plate
buffer
polyolefin foam
Prior art date
Application number
PCT/JP2003/011920
Other languages
English (en)
Japanese (ja)
Inventor
Yoshihito Fukasawa
Noboru Nakahara
Original Assignee
Asahi Kasei Life & Living Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asahi Kasei Life & Living Corporation filed Critical Asahi Kasei Life & Living Corporation
Priority to AU2003264494A priority Critical patent/AU2003264494A1/en
Priority to JP2004537604A priority patent/JP4437443B2/ja
Publication of WO2004026726A1 publication Critical patent/WO2004026726A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/02—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents specially adapted to protect contents from mechanical damage
    • B65D81/05—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents specially adapted to protect contents from mechanical damage maintaining contents at spaced relation from package walls, or from other contents
    • B65D81/107—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents specially adapted to protect contents from mechanical damage maintaining contents at spaced relation from package walls, or from other contents using blocks of shock-absorbing material
    • B65D81/113—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents specially adapted to protect contents from mechanical damage maintaining contents at spaced relation from package walls, or from other contents using blocks of shock-absorbing material of a shape specially adapted to accommodate contents

Definitions

  • the present invention relates to a shock absorber that intervenes between an object to be packed and an outer box that stores the same, absorbs external force such as an impact, and protects the object to be packed.
  • a combination of a cushion and an outer box has been generally used for packaging of electric devices such as an audio device, a television, and a personal computer.
  • the shock absorber used here intervenes between the outer packaging and the package of the object such as electrical equipment, and when external force such as impact is applied, the shock absorber itself is damaged and absorbs external force.
  • a foamed plastic molded article is widely used as a material for protecting a packaged object, and as a material having a light weight and a good cushioning ability.
  • the shape of the cushion made of the foamed plastic molded body is appropriately selected depending on the weight and shape of the packaged body, but usually has an opening or a concave portion for fitting the packaged body, and a pair of opposed bodies is provided. In many cases, one set is used, or one set is arranged at each of the four corners of the package.
  • a manufacturing method there is a method in which a mold having a desired shape is used to perform integral molding by in-mold foaming (for example, see JP-U-59-175590).
  • a general method is to cut out each part from the body and bond them with a heat-sealing adhesive to integrate them (for example, see JP-U-5.4-18541).
  • the buffer is integrally formed by foaming in the mold, it is necessary to manufacture individual dies corresponding to the shape of the package, which is economically inefficient.
  • the process is complicated.
  • This cushion is foldable around the hinge portion, and a smooth and durable hot-melt skin layer is provided on both surfaces of the polyolefin extruded foam plate.
  • a smooth and durable hot-melt skin layer is provided on both surfaces of the polyolefin extruded foam plate.
  • the extruded foam plate warps in the direction in which the skin layer contracts (or expands).
  • the hinge portion provided on the skin layer is easily broken during transportation of the packaged product, and the hinge portion may be raised or returned for repeated use. If it breaks easily during the operation, some inconvenience occurs. .
  • An object of the present invention is to provide a cushioning material for a polyolefin foam plate having a hot-melt skin layer on the entire surface and having a hinge portion formed by a cut that does not penetrate the skin layer. It is an object of the present invention to provide a shock absorber having excellent strength, having an excellent strength, being easy to manufacture, and capable of being repeatedly used.
  • the present inventors have focused their research on a method for producing a hot-melt skin layer, and found that a hot-melt skin layer having a specific structure does not cause warping of the foamed board, and at the same time is excellent.
  • the present inventors have found that a hinge portion having improved strength can be formed, and have completed the present invention.
  • the present invention comprises the following inventions (1) to (8).
  • the hot-melt skin layer was formed by observing a massive resin portion and a single resin bonded to the massive resin portion in a direction substantially parallel to the surface of the polyolefin foam plate.
  • a buffer body characterized in that the entire surface of the polyolefin foam plate has a ⁇ convex shape by the block-shaped resin portion and the layered resin portion.
  • the bulk density of the central part of the polyolefin foam board is 0.010 to 0.050 g.
  • the opening is in contact with a pair of opposite sides of the opening.
  • the central part of the long side or the short side forms a trapezoidal shape that forms the end of the opening, leaving polyolefin foam at least near the both ends of the long side.
  • the plate is cut to form at least one protrusion, and the unfused hot-melt skin layer on the long side is used as a hinge portion, and the protrusion is rotated around the hinge portion as a central axis, whereby the protrusion is formed.
  • Part on the hot-melt skin layer of the shock absorber is packed by a fitting part comprising at least a cavity part of the polyolefin foam plate after the protrusion part has come off and an opening part adjacent to the cavity part. Fits into the body For, cushion according to any one of (1) to (5).
  • At least one of the two pairs of opposite sides of the opening is formed.
  • the solid line portion of the broken line is bent or curved at the center, and the cut portion is formed such that the bending or bending direction is the same within the same broken line and the opposite direction is the adjacent broken line.
  • the hot-melt skin layer is more effective when provided on one surface of the polyolefin foam plate, but may be provided on both surfaces in some cases, and the present invention includes both embodiments. .
  • FIG. 1A is an enlarged photograph of the particle structure of a cross section of a polyolefin foam plate having a hot-melt skin layer.
  • FIG. 1B is an enlarged photograph of the particle structure of a cross section of a polyolefin foam plate having a hot-melt skin layer.
  • 2A, 2B and 2C show an embodiment of the buffer of the present invention.
  • 3A, 3B and 3C show another embodiment of the shock absorber of the present invention.
  • FIG. 4 shows an example of a combination in which the buffers of FIGS. 2A to 2C are used.
  • FIG. 5 shows an example of a combination in the case of using the buffers of FIGS. 3A to 3C.
  • FIG. 6 shows an example of a package using the buffer of FIGS. 2A to 2C.
  • FIG. 7 shows an example of a package using the buffer of FIGS. 3A to 3C.
  • FIG 8A and 8B show another embodiment of the shock absorber of the present invention.
  • FIG. 9 shows another embodiment of the buffer of the present invention.
  • FIG. 10 shows another embodiment of the buffer of the present invention.
  • FIG. 11 is a schematic view of an apparatus for applying a hot-melt skin layer to a foam board.
  • Figures 12A and B are schematic diagrams of measurement of the hinge part breaking limit energy (kgf-cmZcm).
  • polyethylene foam board As the polyolefin foam board, a polyethylene or polypropylene resin foam board is preferably used. Particularly preferred is a low-density polyethylene foam board (LDPE), and both uncrosslinked and crosslinked polyethylene foam boards are preferably used. It is preferable to use a low-density polyethylene foam plate because the flexibility of a hinge portion described later increases. When reworking to another form of product is important, an uncrosslinked polyethylene foam board is advantageous.
  • LDPE low-density polyethylene foam board
  • the bulk density of the polyolefin foam board is 0.010 to 0.050 ⁇ . 111 3 are preferred, and more preferably 0.015 to 0.440 gZcm 3 . Within this range, the flexibility of the hinge part is further enhanced.
  • the thickness is preferably from 15 to 100 mm, more preferably from 20 to 6 Omm.
  • any of bead foam molding and extrusion foam molding is preferably used. Further, molding by extrusion foaming is preferable in that it can be manufactured efficiently.
  • polyolefin foam board a commercially available polyolefin foam board (for example, uncrosslinked polyethylene foam board manufactured by Asahi Kasei Corporation, trade name “Suntech Foam”) can be used.
  • Figs. 1A and 1B each is an enlarged photograph of a cross section perpendicular to the surface of the polyolefin foam plate, and the scale unit at the left and right ends is mm).
  • the hot-melt skin layer (i) when observed in a cross section perpendicular to the surface of the polyolefin foam plate, showed a lump resin portion (ii) and a lump resin portion (ii) on the surface of the polyolefin foam plate.
  • it is composed of a single or a plurality of layered resin parts (iii) or (iV) which are joined in a substantially parallel direction, wherein the massive resin part (ii) and the layered resin parts (iii) and (iv) Has a structure distributed over the entire surface of the polyolefin foam plate.
  • small air bubbles may be contained in the massive resin part (ii).
  • (V) represents a bubble film. Due to this non-uniform specific structure, a hinge portion having excellent strength can be formed at the same time without generating warpage in the polyolefin foam plate.
  • the thin layered resin portion can be stopped by an adjacent thick lump resin portion, and as a result, the function of the hinge portion itself is not affected and the thinned resin portion is thin. Since the overall average thickness of the hot-melt skin layer can be made smaller by the presence of the layered resin portion, the problem of warpage is solved.
  • the surface of the polyolefin foam plate is made uneven by a lump of resin and a layer of resin to increase the surface friction coefficient.
  • the effect of this will be described with reference to FIGS. 2A to 3C to 3A to 3C, which will be described later.
  • the protrusion (5) caused by rotation is firmly held by the frictional force on the uneven surface of the hot-melt skin layer (12), and the protrusion (5) is easily restored by its elastic restoring force. None return to the shape.
  • the protrusion (5) can easily return to its original shape due to its elastic restoring force.
  • the thickness of the massive resin part is preferably 2.0 to 13.6 times the average thickness of the cell membrane at the center of the polyolefin foam plate, and
  • the thickness of the layered resin portion is preferably 1.0 to 8.5 times the average thickness of the cell membrane at the center of the polyolefin foam plate. If it is 2.0 times or more and 1.0 times or more, respectively, the strength of the formed hinge portion becomes stronger, and if it is 13.6 times or less and 8.5 times or less, warpage during processing to form a hot-melt skin layer. Is more difficult to occur.
  • the ratio of the length of the lump-shaped resin portion to the length of the layered resin portion is preferably 30:70 to 60:40. Within this range, most of the layered and massive resin parts have an appropriate balance, so that warpage occurs in the hot-melt skin layer forming process while improving hinge strength. There is no fuss.
  • the polyolefin foam plate is heated using at least one of heating means of a hot-wire heater, a far-infrared heater and a hot-air heater, and the surface thereof is heated to a temperature higher than the melting point of the resin having the highest melting point constituting the foam.
  • a foam made of 70 ° C. or less for example, low-density polyethylene, it is heated at a temperature of 110 ° C. or more and 180 ° C. or less for 5 seconds or more and 20 seconds or less.
  • the heating conditions are such that a large number of secondary foaming projections are generated on the surface of the polyolefin foam plate, and the secondary foaming projections are not disappeared.
  • the heating conditions are suitable for generating a non-uniformly structured hot-melt skin layer composed of a lump and a layered resin portion.
  • the heating temperature is 110 ° C. or higher, even if the heating time is shorter than 20 seconds, the formation of the secondary foaming protrusion and the appropriate softening of the resin immediately below the secondary foaming protrusion can be obtained, and the heating temperature can be improved. If the temperature is lower than 180 ° C., even if the heating time is 5 seconds or longer, the secondary foamed portion does not break and the projections are formed, and the resin immediately below the secondary foamed projections is moderately softened. In any case, the heat-fused skin layer having a non-uniform structure composed of the lump-shaped and layered resin portions is more easily formed.
  • the polyolefin foam plate that has undergone the heating step is passed between a pair of cooling rolls.
  • the surface of the cooling roll is kept at 20 to 80 ° C, preferably at 35 to 75 ° C, more preferably at 50 to 70 ° C by flowing cooling water or the like inside. You.
  • the heat-fused skin layer having a non-uniform structure composed of the massive and layered resin portions is formed.
  • the top surface of the secondary foam protrusion generated by the heating step is compressed, and the top surface of the foam mainly consists of the secondary foam protrusion and the soft resin present thereunder. Is compressed to form a layered structure, and the rising wall of the secondary foaming protrusion and the soft resin present below the main wall are mainly compressed intermittently, It folds into a lump, resulting in a hot melt swath of the heterogeneous structure. A kin layer is formed.
  • the surface of the polyolefin foam plate has an uneven shape.
  • the hinge portion is formed by providing a cut not penetrating the hot-melt skin layer in a polyolefin foam plate having the hot-melt skin layer.
  • the hot-melt skin layer is such that the lump-shaped and layered resin portions are distributed over the entire surface of the polyolefin foam plate, as described above, as a result, the hot-melt skin layer is provided anywhere on the polyolefin foam plate.
  • the lump and the layered resin part also exist at the hinge part.
  • the shock absorber of the present invention can be used for all shock absorbers requiring a hinge portion. Two typical examples are shown below.
  • An opening is formed in a polyolefin foam plate having a hot-melt skin layer on the entire surface, and a trapezoidal protruding portion is cut adjacent to the opening, leaving a part of the hot-melt skin layer.
  • the uncut hot-melt skin layer is used as a hinge portion to raise the protrusion from the buffer plate, thereby exhibiting a good buffering ability.
  • space can be saved, and it can be suitably used for reuse.
  • the projecting portion supports the object to be packed with the foam plate and the hot-melt skin layer arranged in parallel, a higher level and a higher buffering capacity can be obtained as compared with the related art.
  • this buffer is manufactured by cutting a polyolefin foam plate having a hot-melt skin layer according to the shape of the package, mass production is easy, and even if the buffer has a different shape.
  • the same polyolefin foam plate can be used. This buffer will be described in more detail below with reference to FIGS.
  • At least one rectangular opening penetrating in the thickness direction is provided in the buffer plate, and a trapezoidal protrusion is cut and formed in contact with the opening.
  • the gentle ft one body can be roughly divided into two depending on the direction of the trapezoid of the protrusion with respect to the edge of the opening.
  • the long side of the two parallel sides of the trapezoid opposite to each other is a hinge part when the projecting portion is raised from the buffer plate, so that the long side constitutes the end side of the opening.
  • An inner hinge type, and a case where the short side constitutes an end side of the opening is an outer hinge type.
  • FIGS. 2A to 2C are views showing an embodiment of a moderately flexible inner hinge type of the present invention.
  • A is a plan view
  • B is a cross-sectional view taken along the line I-II in A
  • C is a cross-sectional view taken along the line I-II in which the protruding portion 5 in the figure is caused.
  • 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
  • 7 is a cutout portion
  • 8 Is the long side of the protruding part
  • 9 is the side of the protruding part
  • 11 is a polyolefin foam plate
  • 12 is a hot-melt skin layer (indicated by diagonally shaded portions)
  • 13 is A cavity
  • 14 is a gap.
  • the buffer 1 has, as a basic configuration, at least one rectangular opening 3 penetrating in the thickness direction in a buffer 2 composed of a polyolefin foam plate 11 and a hot-melt skin layer 12. 2 On a plane parallel to the surface, a trapezoidal projection 5 is formed by cutting in contact with a pair of opposite sides 4 of the opening 3.
  • the inner side hinge type has a long side 8 in contact with the opening 3 of two opposing parallel sides of the protrusion 5 having a trapezoidal plane parallel to the surface of the buffer plate 2.
  • the central portion of the long side 8 excluding the vicinity of both ends 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, but in the vicinity of both ends of the long side 8 extending from the end side 4, only the foam plate 11 is cut off, and the hot melt is performed.
  • the skin layer 12 is not cut, and at the side 9 connecting the short side 6 end and the long side 8 end, both the foam plate 11 and the hot-melt skin layer 12 are cut. I have.
  • the protruding portion 5 is connected to the main body of the buffer plate 2 by the hot-melt skin layer 12 near both ends of the long side 8.
  • the uncut hot-melt skin layer 12 near the end is used as a hinge, and the protrusion 5 is turned around 90 ° while being bent outward with the hinge as a central axis.
  • the raised protrusion 5 remains connected to the two buffer plates by the hot-melt skin layer 12 at the hinge.
  • the hot-melt skin layer 12 is bent outward. However, since the cutting of the foam plate 11 does not reach the hot-melt skin layer 12, the hot-melt skin layer 12 exhibits high hinge strength.
  • the hot-melt skin layer 12 bent at the hinge portion presses the protruding portion 5 in the direction of the buffer plate 2 in an attempt to return to the original state by the restoring force, but the thickness of the end of the long side 8 is The part of the short side 6 protrudes in the reverse taper shape toward the end of the short side 6 and is blocked by the main body of the buffer plate 2 forming the side 9 so that it cannot return to the cavity 13 and the bow I is raised outward. In this state, the protrusion 5 is substantially fixed to the main body of the buffer plate 2.
  • the protrusion 5 When the protrusion 5 is caused, contrary to the above, the thickness of the end of the long side 8 is hindered by the main body of the buffer plate 2 forming the side 9, but this buffer is acceptable. Since it is composed of a polyolefin foam 11 having high flexibility and elasticity and a hot-melt skin layer 12 having excellent flexibility, the protruding portion 5 is bent so as to protrude toward the long side 8. And Z, or the end of the protruding portion 5 or the body of the buffer plate 2 can be compressed and deformed to cause the protruding portion 5.
  • the protruding portion 5 and the shock absorbing plate 2 main body can return to their original shapes due to the good restoring force of the foam plate 11.
  • the protruding portion 5 and the buffer plate 2 can be appropriately compressed or bent, and the raised protruding portion 5 can be housed in the hollow portion 13 to return to a low-bulk plate shape.
  • the protruding portion 5 can be formed to protrude outside the buffer plate 2 when packing the object to be packed, and can be formed into a low-bulk plate shape when stored and transported when not in use.
  • the notch 7 is provided at the center of the short side 6 of the protrusion 5, so that the protrusion 5 is caused from the buffer plate 2 or in the cavity 13.
  • the protruding portion 5 becomes easy to bend, which facilitates the work. it can.
  • the protrusion 5 can be caused or stored more easily. be able to.
  • FIG. 4 is a perspective view showing a combination when packing the packaged object using the cushioning material of FIG. 2
  • FIG. 6 is a perspective view of the package in which the packaged object 51 is packed with the cushioning material of FIG. 2. It is a perspective view.
  • the buffer 1 is basically used as a pair of opposing pairs, and the cavity 13 after the protrusion 5 is raised from the buffer plate 2 and the cavity 1.
  • the opening 3 adjacent to 3 is fitted at least from both sides of the packaged body 51 as a fitting portion.
  • the support surface of the protrusion 5 that is supported in contact with the packaged object 5 1 is The foamed board 11 and the hot-melt skin layer 12 are arranged in parallel to support the packaged object 51.
  • the foam plate 11 and the hot-melt skin layer 12 are arranged in parallel on the side of the short side 6 of the protruding portion 5 in contact with the outer box, so that when an external force is applied, the foam plate 1 1 Stress is applied in the plane direction of the hot-melt skin layer 1 and 2, compared with the case where the foam plate 11 and the hot-melt skin layer 1 2 are supported, or the case where only the foam plate having the same thickness as the buffer plate 2 is supported. High buffer capacity is obtained.
  • FIGS. 3A to 3C show an embodiment of the outer hinge type of the shock absorber of the present invention.
  • 2A to 2C are the same as those in FIGS. 2A to 2C, and the same members as those in FIGS. 2A to 2C are denoted by the same reference numerals.
  • 21 is a buffer of the present embodiment, and 22 is an opening.
  • the short side 6 of the protruding portion 5 constitutes the end side of the opening 3 contrary to the inner hinge type.
  • the short side 6 coincides with the edge of the opening 3.
  • the center of the short side 6 corresponds to the edge of the opening 3. It is only necessary to configure.
  • the cushioning plate 2 since the long side 8 of the protrusion 5 is a hinge, the protrusion Also in 5, the cushioning plate 2 has the foamed plate 11 and the hot-melt skin layer 12 cut off on the side 9 and only the foamed plate 11 cut off on the long side 8 to form the hot-melt skin. Layer 12 is not cut.
  • the protruding portion 5 is formed from the buffer plate 2 by using the undeformed hot-melt skin layer 12 of the long side 8 as a hinge portion and compressive deformation and radius.
  • the protrusion 5 caused by being rotated by 90 ° and caused once can be stored in the cavity 13.
  • the protruding portion 5 is raised, similarly to FIGS. 2A to 2C, the long sides 8 of the protruding portion 5 are blocked by the two shock-absorbing plates forming the side edges 9 at both ends. And the buffer plate 2 are substantially fixed to the main body.
  • the protruding portion 5 can be easily bent, and the protruding portion 5 is caused to be easily compressed. Furthermore, in this embodiment, as shown in FIGS. 3A to 3C, by providing an opening 22 in contact with the long side 8 of the protruding portion 5 on the right side of the drawing, the protruding portion 5 is located on the long side 8 side. It becomes easier to bend to the convex, and the work becomes easier. As shown in FIG. 8B, when both ends of the short side 6 extend outside the ends of the opening 3, a gap 7 is provided between the short side 6 and the buffer plate 2 main body. Forming 1 causes the protrusions 5 to facilitate the storage operation.
  • FIG. 5 is a perspective view showing a combination when packing the object to be packed using the cushioning bodies of FIGS. 3A to 3C
  • FIG. 7 is a perspective view of the package in which the object to be packed 51 is packed.
  • the buffer 21 of the present embodiment is basically used as a pair in a pair facing each other similarly to the buffer 1 of FIGS.
  • the hollow portion 13 raised from the plate 2 and the opening 3 adjacent to the hollow portion are fitted at least from both sides of the packaged object 51 as fitting portions.
  • the package 51 is supported by the foam plate 11 and the hot-melt skin layer 12 arranged in parallel.
  • a higher buffering capacity than before can be obtained.
  • the outer hinge type buffer is manufactured by cutting the buffer plate 2 from the foam plate 11 (raw material) on which the hot-melt skin layer 12 is formed, and at the same time, cutting the openings and protrusions.
  • the cutting process is generally used for cutting force of foam, A method such as punching can be used.
  • the portion of the protruding portion that does not cut the hot-melt skin layer 12 can be cut at the same time by changing the height of the punching blade from the portion to be cut.
  • the trapezoidal shape which is the planar shape of the protruding portion, is defined as a shape in which the length in the direction parallel to the long side gradually decreases toward the long side end force short side end.
  • the trapezoid whose side 9 is a straight line as shown in Figs. It may be composed of a combination. Further, the case where the side 9 is a curve is also included in the present invention.
  • the outer and inner hinge cushions basically come into contact with a pair of opposing edges 4 of the opening 3 and each have a protruding portion 5.
  • the opposing protrusions 5 are not limited to the same shape.
  • the inner hinge of FIG. 2A-C and the outer hinge of FIG. 3A-C may be used in combination.
  • the number of openings 3 is not limited to one, but two or more openings 3 are formed, and each of the protrusions 5 is formed.
  • the package is formed when two or more openings are provided, and one protrusion 5 is provided between the openings that contact each other, and the protrusion 5 is raised.
  • a form in which a plurality of openings adjacent to each other in a cavity is formed to form one fitting portion is also preferably applied.
  • the protrusion is arranged in the middle of the fitting portion to increase the buffering capacity.
  • the strength of the buffer itself can be increased.
  • the notch 15 is formed as appropriate in the two buffer plates to adjust the flexibility and strength. It is possible.
  • this buffer is used as a pair of opposing pairs, but the pair does not need to have the same shape, and depends on the shape of the packaged object.
  • different shapes and different hinge type buffers may be used in combination.
  • the hot-melt skin layer 12 of the foam plate 11 is formed. It is possible to adjust the buffering capacity and strength by laminating a similar hot-melt skin layer on the non-existing surface.
  • this shock absorber by providing a plurality of cut portions in the shock absorber plate 2 so as to be expandable, the volume when not in use is further reduced, and the convenience in collection and repeated use can be improved.
  • Fig. 9 shows a specific example.
  • reference numeral 101 denotes a cut portion penetrating through the buffer plate 2, and at least one of the two pairs of opposite sides 4a to 4d of the opening 3 at the ends 4a and 4c or 4b.
  • And 4 d are provided with a cutout 101 in the shape of a broken line in the buffer plate 2.
  • FIG. 9 shows an example in which both are provided.
  • the cut portion 101 is provided in a plurality of broken lines crossing the buffer plate 2 so that the breaks of adjacent broken lines are alternately arranged.
  • the direction of the broken line may be a direction orthogonal to the end sides 4a to 4d, but may be a direction obliquely intersecting the end sides 4a to 4d.
  • the buffer plate 2 When the buffer plate 2 provided with such a plurality of cut portions 101 is pulled so as to widen the cut portions 101 in the directions of arrows 102 and 103, the buffer plate 2 expands in a mesh form, The substantial flat area can be expanded, and the mesh can be closed again when not in use to easily return to the original volume, so that the volume reduction effect when not in use is high.
  • the buffer plate in the opening 3 is usually discarded, but in this configuration, the opening 3 itself can be made smaller than the configuration without the cutout 101, so that the volume of the buffer plate to be discarded is reduced. Economic efficiency.
  • the cut portion 101 in FIG. 9 is bent or curved at the center to make it easy to spread, and FIG. 10 shows the bent shape.
  • FIG. 10 is a partial plan view of this buffer body having a chevron cut portion 101 ′. That is, as shown in FIG. 10, the solid portion of the broken line is bent or curved at the center, and has a mountain shape. The bending or bending directions are the same within the same broken line, and the opposite directions are adjacent to the broken line. Then, a notch portion 101 ′ is formed.
  • shock absorber of the present invention will be described in more detail below using examples of the 1L-shaped shock absorber pad and 2fitting shock absorber (inner hinge type, outer hinge type shock absorber).
  • the bulk density (pf) of the foamed board used below is measured by the following measuring method. Method for measuring foam board bulk density (pf)
  • the hot-melt skin layers were formed on the foamed boards of Examples 1 and 2 and Comparative Examples 1 and 2 using the following [apparatus for applying a hot-melt skin layer. Conditions].
  • Comparative Example 3 the trade name Suntech Foam ⁇ 15> was used as it was (without performing the hot-melt skin layer application treatment).
  • a far-infrared rod heater (diameter 12 mm, effective length 70 Omm heater 80 Ow / piece) is installed in the center upper part of the horizontal base a.
  • the vertical distance from the heater to the heater is set to be adjustable.
  • a pair of drive holes c (diameter 100 mm, length 800 mm) are provided immediately before the heating section b and a pair of drive rolls d (diameter 100 mm, (Length: 800 mm) is mounted so that it can be moved up and down so that the gap between each of them can be varied.
  • the cooling roll has a structure (not shown) that allows cooling water to flow through the inside of the drive roll d on the outlet side of the device to cool the surface of the roll.
  • the warpage (mm) in the length direction and the width direction was determined by the following method.
  • the average thickness of the bubble film and the dimensions ( ⁇ ) of the bulky resin portion and the layered resin portion of the hot-melt skin layer were measured.
  • the foamed foam sheet completely cooled to room temperature is placed on a horizontal table with the concave surface of the warp facing upward.
  • For the warpage in the width direction measure at least 3 points at both ends of the length and in the width direction, a total of 6 points or more, and take the average value.
  • Measurement of the average thickness of the foam film at the center of the foam board Force the center of the foam board in the width direction to about 10 cm in its length direction, and take enlarged cross-sectional photographs of 10 or more thickness center layers at approximately the same intervals. Draw a line parallel to the skin surface at the center in the thickness direction of the photograph, read the number of each bubble film and each bubble film thickness on that line, divide the total value of the bubble film thickness by the number of bubble films and average Determine the thickness of the bubble film.
  • the foam plate of Comparative Example 3 was cut in the same manner as in Example 1 to form a hinge portion composed of a foam skin surface skin layer having a thickness of 2 mm. Got putt.
  • the breaking limit energy (kgf-cm / cm) was determined by the following method.
  • FIG. 12 A and B (A is a front sectional view and B is a sectional view taken along the line I_I of A.)
  • FIG. Create a box with 5 O mm and two open sides of 9 O mm x 50 mm next to each other, and insert the open side of the L-shaped buffer pad (Suntech Foam (trade name)) 105 into the inside of this cardboard box It is adhered and fixed to both sides with adhesive tape (thick), and this is fixed on a fixing jig (wooden) 107 having a horizontal ridge at right angles, with a film or skin layer 106 on the horizontal ridge. Put the L-shaped pad on the hinge pad so that it touches.
  • L-shaped buffer pad (Suntech Foam (trade name))
  • a weight having a predetermined weight is dropped freely from a predetermined height on the top of the B-flute corrugated cardboard box to apply an impact, and a limit weight and a drop height at which the hinge portion is broken are determined. From the weight at break limit (Wk gf), drop height (hem) and hinge length (5 cm) obtained in this way,
  • Thick cushioning material before heat treatment Thick cushioning material after heat treatment
  • Example 1 LDPE 0.025 16-49 50 78-346 / 2.4- 11.2 36 35-211 / 1.1-6.5 64 8 10 O 28.00
  • Example 2 LDPE 0.025 16-49 48 101-429 / 3.1-13.2 53 42-267 / 1.3-8.2 47 33 16 ⁇ 36.30 Comparative Example 1 LDPE 0.025 16- 49 51 52-234 / 1.6-7.2 17 26-130 / 0.8-4.0 83 0 0 O 13.80 Comparative Example 2 LDPE 0.025 16-49 46 114-455 / 3.5-14.0 64 52-286 / 1.6-8.8 36 52 27 X 51.60 Comparative Example 3 LDPE 0.068 33-66 52 74-297 / 1.5-6.0 3.45
  • the foam boards having the hot-melt skin layers of Examples 1 and 2 and Comparative Examples 1 and 2 were used.
  • Buffer A (for medium weight dummy, inner hinge type, flat shape shown in Fig. 8A)
  • the maximum outer dimension of the shock absorbing plate 2 is 469 mm (left and right on the paper)
  • X 2 4 mm vertical on the paper
  • the long side 8 of the protruding portion 5 is 1 94 mm
  • the short side 6 is 1 7 4 mm
  • the distance between the long side 8 and the short side 6 is 46 mm
  • the distance between the long sides 8 of the two protrusions 5 is 22 mm
  • the width of the opening 3 (vertical direction in the drawing) is 1 14 mm It is.
  • Buffer B (for medium weight dummy, outer hinge type, planar shape shown in Fig. 8B)
  • the maximum outer dimension of buffer plate 2 is 469 mm (left and right on the paper)
  • long side 8 of protrusion 5 is 1 94 mm
  • short side 6 is 1 74 mm
  • distance between long side 8 and short side 6 is 46 mm
  • two protrusions The distance between the short sides 6 of 5 is 260 mm
  • the width of the opening 3 (vertical direction in the drawing) is 114 mm.
  • Cushion C (for light weight dummy, inner hinge type, plane shape shown in Fig. 2A-C) In the plane shape of Fig.
  • the maximum outer dimension of the buffer plate 2 is 328 mm (right and left on the paper surface).
  • XI 9 1 mm (vertical direction on the paper) long side 8 of protrusion 5 is 15 3 mm, short side 6 is 103 mm, distance between long side 8 and short side 6 is 38 mm, two The distance between the long sides 8 of the protrusion 5 is 127 mm, and the width of the opening 3 (vertical direction in the drawing) is 103 mm.
  • Cushion D for lightweight dummy, outer hinge type, flat shape shown in Fig. 3
  • the maximum outer dimension of the buffer plate 2 is 328 mm (left and right in the drawing) 1920
  • long side 8 of protrusion 5 is 153 mm
  • short side 6 is 103 mm
  • distance between long side 8 and short side 6 is 38 mm
  • two protrusions 5 The distance between the short sides 6 is 15 lmm
  • the width of the opening 3 (vertical direction in the drawing) is 103 mm.
  • a drop test (1) to (4) was performed for each buffer, and the hinge of the buffer after the test was performed.
  • the hinge length is the largest, the hinge length is less than 1 Z2 of the hinge length, and the hinge length is 1 Z2 or more of the hinge length. The case was rated as X.
  • the present invention provides a soft polyolefin foam plate having a hot-melt skin layer on its surface and a hinge formed by a cut not penetrating the skin layer.
  • An impact material, wherein the foam plate has no warpage, the hinge portion has excellent strength, and it is easy to manufacture, and it is possible to provide a cushioning body excellent in cushioning performance which can be repeatedly used. .
  • the protruding part may be raised from the buffer plate when packing the packaged object, and the protruding part is stored in the buffer plate except during packing, so it is used for packing work, buffer / book storage and transportation. Space saving can be achieved, and the recycling efficiency can be improved.
  • the projecting portion When the protruding portion is raised from the shock absorbing plate, the projecting portion is substantially fixed to the shock absorbing plate main body by the hinge portion. The work is easy, and the projecting portion does not move during transportation of the package, so that the package can be reliably protected.
  • the package is formed of a foam with a hot-melt skin layer and is supported by the parallel arrangement of both, a high buffering capacity is obtained and the package can be protected more reliably. Also, if the buffering capacity is the same, a thinner or smaller buffer can be used, and the space for the buffer and the package can be saved. In addition, by selecting the thickness, expansion ratio, and the like of the foam and the hot-melt skin layer, it is possible to easily adjust the shock absorbing strength 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 heavy weight, or a package in a case where distribution channel conditions are strict.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Buffer Packaging (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un matériau amortisseur que l'on fabrique au moyen d'une plaque de mousse en polyoléfine ayant une couche revêtement obtenue par fusion thermique sur toute sa partie surface avec une encoche ne traversant pas ladite couche, pour former ainsi une partie charnière. La couche revêtement obtenue par fusion thermique, dans la section transversale perpendiculaire à la surface de la plaque de mousse en polyoléfine, comprend des parties résine volumineuses et au moins une partie résine laminaire jointe à l'une des parties résine volumineuses quasiment parallèle à la surface de la plaque de mousse en polyoléfine, les parties résine volumineuses et les parties résine laminaires étant distribuées sur toute la partie surface de la plaque de mousse en polyoléfine. Enfin, les parties résine volumineuses et laminaires confèrent à toute la partie surface de ladite plaque une forme concave et convexe.
PCT/JP2003/011920 2002-09-19 2003-09-18 Materiau amortisseur WO2004026726A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2003264494A AU2003264494A1 (en) 2002-09-19 2003-09-18 Cushioning material
JP2004537604A JP4437443B2 (ja) 2002-09-19 2003-09-18 緩衝体

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002-273120 2002-09-19
JP2002273120 2002-09-19

Publications (1)

Publication Number Publication Date
WO2004026726A1 true WO2004026726A1 (fr) 2004-04-01

Family

ID=32024944

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Application Number Title Priority Date Filing Date
PCT/JP2003/011920 WO2004026726A1 (fr) 2002-09-19 2003-09-18 Materiau amortisseur

Country Status (5)

Country Link
JP (1) JP4437443B2 (fr)
AU (1) AU2003264494A1 (fr)
MY (1) MY138936A (fr)
TW (1) TWI226301B (fr)
WO (1) WO2004026726A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2213592A1 (fr) * 2007-11-08 2010-08-04 Daikin Industries, Ltd. Elément d'absorption de choc

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4918976U (fr) * 1972-05-24 1974-02-18
JPS524376U (fr) * 1975-06-23 1977-01-12
JPS60123369U (ja) * 1984-01-30 1985-08-20 東芝テック株式会社 包装装置
JPH05124096A (ja) * 1991-11-05 1993-05-21 Kanegafuchi Chem Ind Co Ltd 真空成形用シート
JPH09183162A (ja) * 1995-12-28 1997-07-15 Toray Ind Inc 艶消し表面を有する発泡体およびその製造方法
WO2001056773A1 (fr) * 2000-02-03 2001-08-09 Pactiv Corporation Plaque de mousse polymere a peau densifiee, procede et dispositif de production correspondants
JP2002173192A (ja) * 2000-11-28 2002-06-18 Asustek Computer Inc 調節可能な包装構造体

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4918976U (fr) * 1972-05-24 1974-02-18
JPS524376U (fr) * 1975-06-23 1977-01-12
JPS60123369U (ja) * 1984-01-30 1985-08-20 東芝テック株式会社 包装装置
JPH05124096A (ja) * 1991-11-05 1993-05-21 Kanegafuchi Chem Ind Co Ltd 真空成形用シート
JPH09183162A (ja) * 1995-12-28 1997-07-15 Toray Ind Inc 艶消し表面を有する発泡体およびその製造方法
WO2001056773A1 (fr) * 2000-02-03 2001-08-09 Pactiv Corporation Plaque de mousse polymere a peau densifiee, procede et dispositif de production correspondants
JP2002173192A (ja) * 2000-11-28 2002-06-18 Asustek Computer Inc 調節可能な包装構造体

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2213592A1 (fr) * 2007-11-08 2010-08-04 Daikin Industries, Ltd. Elément d'absorption de choc
EP2213592A4 (fr) * 2007-11-08 2012-01-18 Daikin Ind Ltd Elément d'absorption de choc

Also Published As

Publication number Publication date
JPWO2004026726A1 (ja) 2006-01-12
AU2003264494A1 (en) 2004-04-08
JP4437443B2 (ja) 2010-03-24
TW200408591A (en) 2004-06-01
TWI226301B (en) 2005-01-11
MY138936A (en) 2009-08-28

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