JP2013199291A - Corrugated board cushioning material and method of manufacturing the same - Google Patents

Abstract

A corrugated cardboard cushioning material is provided in which a load exceeding an allowable maximum load is not applied to a contained item even when an assumed maximum load is applied during transportation, and in that case, a cushioning capacity can be left.
A square cylinder cushioning material 10 is disposed between an outer box and a stored item. Wedge-shaped notches 45 are formed at both ends of the surface of the cushioning material 10 along the direction in which the contained material applies force. Each side surface of the cushioning material 10 has a first width proportional to the acceleration at which the side surface starts buckling, and the acceleration at which the side surface starts buckling is obtained in advance. It is formed smaller than the acceleration at which the contents are damaged. Further, the minimum width of each side surface is set to a first length shorter than the length corresponding to the acceleration at which the contents are damaged, based on the first proportional relationship.
[Selection] Figure 2

Description

  The present invention relates to a cardboard cushioning material and a method for manufacturing the same.

  Conventionally, in order to prevent an impact from being applied to an article to be transported, a cushioning material is disposed between the article and an outer box in which the article is accommodated.

  A corrugated cardboard cushioning material is known in which a cut is provided in a surface along the direction in which the load of the article is applied, and the surface is buckled, thereby reducing the impact and load applied to the article (for example, see Patent Document 1). .

JP 2008-137665 A

  When the cushioning material is completely crushed, the impact is transmitted to the article and the article is damaged. However, with the cardboard cushioning material of Patent Document 1, even if the assumed maximum load during transportation is applied, the load exceeding the allowable maximum load is applied to the contents. There is no specific examination about leaving a buffer capacity in that case.

  The present invention has been made in view of such a situation, and even when an assumed maximum load during transportation is applied, the load does not apply a load exceeding the allowable maximum load, and in that case the buffering capacity is It is an object to provide a corrugated cardboard cushioning material capable of leaving

  In order to achieve the above object, a corrugated cardboard cushioning material according to the present invention is a rectangular cylinder corrugated cardboard cushioning material disposed between an outer box and a container, and the container is along a direction in which a force is applied. Wedge-shaped notches are formed at both ends of the surface.

  According to the present invention, there is provided a corrugated cardboard cushioning material in which a load exceeding an allowable maximum load is not applied to the contained item even when an assumed maximum load is applied during transportation, and in that case, the cushioning capacity can be left. can do.

It is a perspective view which shows the use condition of the shock absorbing material which concerns on embodiment of this invention. (A) is a perspective view from the upper part of the shock absorbing material which concerns on embodiment of this invention, (b) is a perspective view from the downward direction. It is an expanded view of the shock absorbing material which concerns on embodiment of this invention. It is a side view of the shock absorbing material which concerns on embodiment of this invention. It is a perspective view which shows the buckled state of the shock absorbing material which concerns on embodiment of this invention. It is explanatory drawing explaining the outline | summary of the test method of the shock absorbing property evaluation test of the shock absorbing material which concerns on embodiment of this invention. (A) And (b) is a graph which shows the result of the buffering characteristic evaluation test of Example 1 of the shock absorbing material which concerns on embodiment of this invention. (A) And (b) is a graph which shows the result of the buffering characteristic evaluation test of Example 2 of the shock absorbing material which concerns on embodiment of this invention. (A) And (b) is a graph which shows the result of the buffering characteristic evaluation test of Example 3 of the shock absorbing material which concerns on embodiment of this invention. It is a perspective view of the shock absorbing material which concerns on other embodiment of this invention.

  Embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment)
As shown in FIG. 1, the cushioning material 10 according to the present embodiment is disposed on the upper side and the lower side of the accommodation 80 accommodated in the outer box 70, that is, between the outer box 70 and the accommodation 80. The The cushioning material 10 is a cushioning material for reducing impact from the outside so as not to be damaged when the contents 80 are being transported.

  As shown in FIGS. 2 (a) and 2 (b), the cushioning material 10 is configured by contacting the side surfaces of two square tubes. The cushioning material 10 includes a first upper surface 21 and a second upper surface 22 that come into contact with the object 80, a lower surface 30 that comes into contact with the outer box 70, and a first upper surface 21, a second upper surface 22, and a lower surface 30. And first to fourth side surfaces 41 to 44 to be connected. The longitudinal direction of the cushioning material 10 is defined as the Y direction, the direction in the same plane as the lower surface 30 and perpendicular to the Y direction is defined as the X direction, and the direction perpendicular to the X direction and the Y direction is defined as the Z direction.

  As shown in FIG. 2A, the first upper surface 21 and the second upper surface 22 are formed in a rectangular shape. The first upper surface 21 and the second upper surface 22 are formed to have the same length in the X direction. In addition, when protrusions, such as a spout, are formed in the accommodation 80, protrusions of such a size that the strength of the cushioning material 10 does not decrease are formed on the first upper surface 21 or the second upper surface 22. A hole for passing through may be formed.

  As shown in FIG. 2B, the lower surface 30 is formed in a rectangular shape. The lower surface 30 is formed such that the length in the X direction is equal to the total length of the X direction length of the first upper surface 21 and the X direction length of the second upper surface 22. In addition, in order to reduce the weight of the buffer material 10, a hole having a size that does not decrease the strength of the buffer material 10 may be formed on the lower surface 30.

  As shown in FIGS. 2A and 2B, the first to fourth side surfaces 41 to 44 are each formed in a substantially rectangular shape having the same length in the Z direction.

  On the + Y side and −Y side ends of the first to fourth side surfaces 41 to 44, wedge-shaped notches 45 having the same size and shape are formed. The cutout 45 is formed in, for example, an isosceles triangle having an apex angle of 60 °. Moreover, the notch 45 is formed so that the position of the top in the Z direction is located at the center of the length in the Z direction of each side surface.

  The cushioning material 10 is formed, for example, by folding a substantially rectangular cardboard sheet 10 ′ shown in FIG. 3. The corrugated cardboard sheet 10 ′ has a first side surface 41, a first upper surface 21, a second side surface 42, a bottom surface 30, a third side surface 43, a second upper surface 22, and a fourth side surface 44 on the left side of FIG. Are arranged in order. A crease 46 is formed between the surfaces. Note that a desired corrugated cardboard conforming to JISZ1516 can be used for the corrugated cardboard sheet 10 '.

  The corrugated cardboard sheet 10 ′ is formed so that the steps are parallel to the direction in which the surfaces are disposed, that is, the horizontal direction of FIG. 3. Thereby, the shock absorbing material 10 is comprised so that the direction of a step and the direction of the load added to the 1st-4th side surfaces 41-44 may correspond.

  The cushioning material 10 is formed by bending each fold 46 of the corrugated cardboard sheet 10 ′ configured as described above at a right angle toward the front side of the sheet of FIG. 3 so that the side surface 41 and the side surface 44 come into contact with each other at the center. By fixing the end portion of the side surface 44 to the lower surface 30 with an adhesive or the like, it is assembled as shown in FIGS. 2 (a) and 2 (b). Although not shown, small insertion pieces may be formed on the left and right ends of the side surface 41 and the side surface 44, a slit may be formed on the lower surface 30, and the insertion piece may be inserted into the slit and fixed.

  Since the cushioning material 10 is configured as described above, as shown in FIG. 4, in each side surface, a region S connecting the top of one notch 45 and the top of the other notch 45 is It is formed so as to be weakest against the force in the Z direction. As a result, when the force applied in the Z direction is greater than the predetermined force F, each side surface buckles the region S and its vicinity.

  In addition, although mentioned later for details, in order to make the buffer material 10 buckle the area | region S and its vicinity, the 1st-4th side surfaces 41-44 are formed as follows.

  The first to fourth side surfaces 41 to 44 are formed such that the acceleration G at which buckling of the side surfaces starts buckling is smaller than the acceleration α at which the object 80 determined in advance is damaged. The first to fourth side surfaces 41 to 44 have the shortest length L among the lengths in the direction parallel to the lines intersecting the upper surfaces 21 and 22 and the side surfaces, which is the minimum width of the side surfaces (see FIG. 4). For example, the distance between one notch 45 and the top of the other notch 45 is formed to have a first proportional relationship with the acceleration G at which buckling starts. The first to fourth side surfaces 41 to 44 have the shortest length L and the maximum displacement amount ΔH of the upper surfaces 21 and 22 when the side surfaces are buckled and the upper surfaces 21 and 22 are closest to the lower surface 30. It is formed to have a second proportional relationship.

  The shortest length L is formed with such a length that the side surface buckles before the containment 80 is damaged even if the containment 80 is subjected to the acceleration α, and the containment is based on the first proportional relationship. 80 is formed shorter than the length corresponding to the acceleration α at which it breaks. Further, the height of the first to fourth side surfaces 41 to 44, that is, the distance H from the first surface to the second surface (see FIG. 4), the protrusion formed on the container 80 does not bottom out. The length is formed by adding the length to which the buffering capacity remains, and is longer than the maximum displacement amount ΔH corresponding to the shortest length L based on the second proportional relationship.

  The cushioning material 10 is manufactured to have the above configuration.

  Since the cushioning material 10 is configured as described above, the cushioning material 10 has a minimum size and is not completely crushed even by the maximum impact that is assumed to be normally applied during the transportation of the accommodation 80. A buffering force can be left without bottoming.

  Next, how the shock absorbing material 10 reduces the force transmitted to the accommodation 80 will be described.

  First, as shown in FIG. 1, the contents 80 and the cushioning material 10 are accommodated in the outer box 70. In order to simplify the description, only the cushioning material 10 disposed on the lower side of FIG. 1 will be described.

  At this time, the first to fourth side surfaces 41 to 44 of the cushioning material 10 are separated from the first and second upper surfaces 21 and 22 and the lower surface 30 by a force F0 (the amount of the contained material) smaller than a predetermined force F in the Z direction. Mass x gravity). However, since the first to fourth side surfaces 41 to 44 are formed so as to withstand a predetermined force F in the Z direction, they are not buckled.

  When the outer box 70 is transported, the outer box 70 and the container 80 are subjected to acceleration in the Z direction during the transport process. At this time, the first to fourth side surfaces 41 to 44 of the cushioning material 10 receive a force F <b> 1 in the Z direction (mass × acceleration of the object) from the first and second upper surfaces 21, 22 and the lower surface 30.

  When the force F1 is smaller than the predetermined force F, the first to fourth side surfaces 41 to 44 are not buckled. On the other hand, when the force F1 is equal to or greater than the predetermined force F, the region S of the first to fourth side surfaces 41 to 44 and the vicinity thereof buckle as shown in FIG. At this time, the first to fourth side surfaces 41 to 44 are buckled by a predetermined amount ΔH in the Z direction.

  As described above, the cushioning material 10 is buckled in the Z direction, thereby reducing the force transmitted to the accommodation 80.

[Buffer characteristic evaluation test and results]
[Example 1]
(Measurement of acceleration to start buckling)
In order to measure the acceleration at which the side surface of the cushioning material starts buckling, a cushioning property evaluation test based on “Packaging Buffering Material—Evaluation Test Method” of JISZ0235 was performed. For the production of the buffer material, corrugated cardboard of A flute according to JISZ1516 having about 34 steps per 30 cm was used. A cardboard is cut out with a cutter, bent and formed as shown in FIGS. 2 (a) and 2 (b), with a length of 10 cm in the X direction, a length of 20 cm in the Y direction, and a length of 3 cm in the Z direction. Twelve were prepared. An isosceles triangle notch with an apex angle of 60 ° is formed at both ends of the side surfaces, and the distance L (see FIG. 4) from the top of one notch to the top of the other notch is 170 mm, 180 mm, and 190 mm. Four cushioning materials 10 were prepared. Further, the moisture content of the cardboard was set to about 10%. ACST-200 manufactured by Shinei Technology was used as a buffer material evaluation test device. As shown in FIG. 6, a block 102 that is regarded as an accommodation is placed on the table 101 of the test apparatus 100, and the cushioning material 10 is placed on the block 102. From 92 cm above the cushioning material 10, a 3 kg weight 105 having an acceleration sensor 104 connected to the measuring device 103 is freely dropped, and the impact acceleration received by the table 101, that is, the acceleration at which the side surface of the cushioning material 10 starts buckling. Was measured.

  FIG. 7A shows the experimental result (distance L-acceleration between tops). As shown in the first linear function f1 (L) in FIG. 7A, the distance L between the tops and the acceleration were approximately proportional.

(Measurement of maximum amount of buckling displacement)
In order to measure the maximum amount of buckling displacement on the side surface of the cushioning material, a cushioning property evaluation test in accordance with JISZ0235 “Packaging Buffering Material—Evaluation Test Method” was performed. As the buffer material, the same number as the above test was prepared. The moisture content of the cardboard was set to 10%. Using the same test apparatus 100 as in the above test, the 3 kg weight 103 was freely dropped by the same test method as in the above test, and the maximum displacement amount of the side surface of the cushioning material 10 was measured.

  FIG. 7B shows the result of this experiment (distance L between the tops—maximum displacement). As shown in the second linear function f2 (L) in FIG. 7B, the distance L between the tops and the maximum displacement amount are approximately proportional.

[Example 2]
(Measurement of acceleration to start buckling)
The cushioning material 10 is formed in the same manner as in Example 1 except that it is formed of corrugated cardboard punched out by a mold. In the same test method as in Example 1, the acceleration at which the side surface of the cushioning material 10 starts buckling was measured. Incidentally, when the cardboard is punched out by a mold, it is compressed and partially crushed.

  FIG. 8A shows the result of this experiment (distance L between the tops—acceleration). The acceleration at which the side surface of the cushioning material 10 starts buckling was smaller than that in Example 1. Further, as indicated by the third linear function f3 (L) in FIG. 8A, the distance L between the tops and the acceleration are substantially proportional.

(Measurement of maximum amount of buckling displacement)
The cushioning material 10 is formed in the same manner as in Example 1 except that it is formed of corrugated cardboard punched out by a mold. The maximum displacement amount of the side surface of the cushioning material 10 was measured by the same test method as in Example 1.

  FIG. 8B shows the result of this experiment (distance L-acceleration between the tops). The maximum amount of displacement of the side surface of the cushioning material 10 was larger than that in Example 1. Further, as indicated by the fourth linear function f4 (L) in FIG. 8B, the distance L between the tops and the acceleration were substantially proportional.

[Example 3]
(Measurement of acceleration to start buckling)
The cushioning material 10 is formed in the same manner as in Example 2 except that the moisture content of the cardboard is about 15%. In the same test method as in Example 1, the acceleration at which the side surface of the cushioning material 10 starts buckling was measured.

  FIG. 9A shows the result of the experiment (distance L between the tops—acceleration). The acceleration at which the side surface of the cushioning material 10 starts to buckle was substantially the same as in Example 2. Further, as shown by the fifth linear function f5 (L) in FIG. 9A, the distance L between the tops and the acceleration were substantially proportional.

(Measurement of maximum amount of buckling displacement)
The cushioning material 10 is formed in the same manner as in Example 2 except that the moisture content of the cardboard is about 15%. The maximum displacement amount of the side surface of the cushioning material 10 was measured by the same test method as in Example 1.

  FIG. 9B shows this experimental result (distance L-acceleration between tops). The maximum displacement amount of the side surface of the cushioning material 10 was larger than that in Example 2. Further, as shown by the sixth linear function f6 (L) in FIG. 9B, the distance L between the tops and the acceleration were approximately proportional.

  Based on the above test results, a cushioning material having an appropriate size can be obtained as follows.

  For example, the length in the X direction of the container is 100 mm, the length in the Y direction is 200 mm, and the acceleration when the container is damaged is 70 G. In this case, first, the length of the cushioning material in the X direction is 100 mm, and the length of the cushioning material in the Y direction, that is, the total length A (see FIG. 4) is 200 mm. When the acceleration is 70 G, according to the first linear function f1 (L) in FIG. 7A, the distance L between the tops where buckling starts is approximately 182 mm. L is 182 mm or less, for example, 180 mm. Thereby, even if the stored item receives an acceleration of 70G, the buffer material buckles before the stored item is damaged, and the force transmitted to the stored item is reduced.

  Next, when the distance L between the tops is 180 mm, the maximum displacement amount is about 10.8 mm according to the second linear function f2 (L) in FIG. A predetermined coefficient set in advance is added to this maximum displacement of 10.8 mm in order to leave a buffering capacity so as not to damage the contents. Thereby, the height H of the buffer material is obtained.

  As described above, the total length A of the cushioning material, the distance L between the tops, and the height H of the cushioning material can be obtained without performing a transportation test. Further, when considering the manufacturing conditions of the corrugated cardboard, the linear functions shown in FIGS. 8A and 8B are used, and when considering the moisture content of the corrugated cardboard, FIGS. By using each linear function of b), a cushioning material having an appropriate size can be obtained.

  As described above, the corrugated cardboard cushioning material 10 according to the present embodiment has wedge-shaped notches formed at both end portions of the side surface, and therefore connects the top of one notch and the top of the other notch. It is possible to reliably buckle the region S.

  Since the corrugated cardboard cushioning material 10 according to the present embodiment has wedge-shaped notches at both end portions of the side surface, the acceleration at which the side surface starts buckling and the minimum width of the side surface are proportional to each other. Even when the assumed maximum load during transportation is applied, it is possible to provide a corrugated cardboard cushioning material in which a load greater than the allowable maximum load is not applied to the contained item and in that case the buffering capacity can be left.

  The distance L between the tops and the acceleration at which buckling of the corrugated cardboard cushioning material 10 starts are generally proportional. Further, the distance L between the tops and the maximum amount of buckling displacement of the cardboard cushioning material 10 are approximately proportional. Accordingly, even if a transportation test is not performed, the container 80 is not completely crushed even with the maximum impact that is assumed to be normally applied during the transportation of the container 80, and the container 80 does not bottom out. In addition, it is possible to obtain a cushioning material that can leave a cushioning force.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and applications are possible. For example, in the above-described embodiment, the cushioning material 10 is configured by abutting the side surfaces of two square cylinders. However, as illustrated in FIG. 10, the cushioning material 100 is configured by one square cylinder. It may be.

  In the embodiment described above, the notch 45 has an apex angle of 60 °, but is not limited thereto. The notch 45 only needs to have an apex angle, and the apex angle may be 60 ° to 120 °. As long as the notch has an apex angle, both sides sandwiching the apex angle of the notch may not be a straight line. In this case, the apex angle is an angle formed by tangent lines on both sides at the apex. In the present invention, even when both sides of the notch are curved lines, for example, arcs, they are included in the wedge-shaped category.

  In the above-described embodiment, a predetermined coefficient set in advance so as to prevent damage to the stored object is added to the maximum displacement amount. However, the present invention is not limited to this, and the maximum displacement amount is multiplied by a predetermined coefficient. May be.

  In the above-described embodiment, the first upper surface 21 and the second upper surface 22 of the cushioning material 10 are the surfaces that come into contact with the container 80. However, the present invention is not limited to this, and the lower surface 30 is the container. The surface may be in contact with 80.

DESCRIPTION OF SYMBOLS 10 Buffer material 10 'Corrugated cardboard sheet 21 1st upper surface 22 2nd upper surface 30 Lower surface 41 1st side surface 42 2nd side surface 43 3rd side surface 44 4th side surface 45 Notch 46 Folding 70 Outer box 80 100 cushioning material

Claims (7)

It is a rectangular cylinder corrugated cushioning material disposed between the outer box and the contents,
Wedge-shaped notches are formed at both ends of the surface along the direction in which the container applies force,
A cardboard cushioning material. A first surface that contacts the container; a second surface that contacts the outer box and faces the first surface; and the first surface and the second surface formed with the notch. And a side surface for connecting,
The side surface has a first proportional relationship with an acceleration at which the side surface starts buckling, with the shortest length of the side surface in a direction parallel to the line intersecting the first surface and the side surface. And, the acceleration at which the side surface starts buckling is formed smaller than the acceleration at which the container is damaged in advance,
The corrugated cardboard according to claim 1, wherein the shortest length is a first length shorter than a length corresponding to an acceleration at which the accommodation is damaged, based on the first proportional relationship. Made of cushioning material. The side surface further has a second proportional relationship with a maximum displacement amount of the first surface when the side surface is buckled and the first surface is closest to the second surface. Formed to have
The length from the first surface to the second surface is a second length that is longer than the maximum displacement corresponding to the first length, based on the second proportional relationship. The cardboard cushioning material according to claim 2.   The corrugated board cushioning material according to any one of claims 1 to 3, wherein a straight line connecting the tops of the notches is parallel to the first surface and the second surface.   The cardboard cushioning material according to any one of claims 1 to 4, wherein the notch is an isosceles triangle.   The corrugated cardboard cushioning material according to any one of claims 1 to 5, wherein an apex angle of the notch is 60 ° to 120 °. A first surface that is disposed between the outer box and the container, contacts the container, a second surface that contacts the outer box and faces the first surface, and wedges at both ends. A method of manufacturing a rectangular cylinder corrugated cardboard cushioning material comprising a side surface connecting the first surface and the second surface in which a notch is formed,
The side surface has an acceleration at which the surface starts buckling smaller than a predetermined acceleration at which the container is damaged, and the side surface has a direction parallel to a line where the first surface and the side surface intersect. The shortest of the lengths has a first proportional relationship with the acceleration at which buckling starts, and the shortest length of the side buckles so that the first surface is the second Forming a second proportional relationship with a maximum displacement amount of the first surface when closest to the surface;
A step of setting the shortest length to a first length shorter than a length corresponding to an acceleration at which the accommodation is damaged based on the first proportional relationship;
Setting the length from the first surface to the second surface to a second length longer than the maximum displacement corresponding to the first length, based on the second proportional relationship; ,
A method for producing a cushioning material made of corrugated cardboard.

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