JP2005153922A - Shock absorbing packaging material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shock absorbing cushion, which holds an article properly to absorb a shock, and deforms compressively to damp vibrations generated during transportation. <P>SOLUTION: A shock absorbing packaging material for protecting an article has an opening that fits to the outline of the article, and projections that absorb an external force by deforming elastically in response to a load applied by the external force and project from the outer peripheral surface of the packaging material. This structure can realize the shock absorbing packaging material which holds the article properly to absorb a shock and is deformed elastically to damp vibrations generated during transportation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an impact-absorbing packaging material, and more particularly to a packaging material that protects an article from vibrations or impacts that occur during the transportation of the article.

  Conventionally, when packing an article in a packing box or the like, as shown in FIGS. 1 (a) and 1 (b), for example, recesses 3a and 3b (3b are diagrams) formed according to the outer shape of the article 1 by using polystyrene foam or the like. A method is employed in which the article 1 is fitted into the recesses 3a and 3b using the holding bodies 2a and 2b having a not-shown), and the article 1 is fixed in the packing box so as not to move.

  In this way, the method of packing an article in a packing box using a molded holding body is the same as the plane created by the bottom surface of the holding body, that is, the impact or vibration applied from the front, rear, left and right directions on the plane. Since the holding bodies 2a and 2b are fitted to the article 1, they can be absorbed by the deformation of the holding bodies 2a and 2b. However, what is a problem during transportation of an article is an impact or vibration applied from the vertical direction of the plane, that is, the vertical direction of the article 1. At this time, it is necessary to increase the width of the protrusion 4 shown in FIG. 1 in order to absorb the impact, and it is necessary to decrease the width of the protrusion 4 in order to absorb vibration. For this reason, the shape of the protrusion 4 has to be compromised with any width, and as a result, there has been a problem that the impact or vibration from the vertical direction of the article cannot be sufficiently absorbed.

  Regarding such a problem, as seen in, for example, Patent Document 1, a first tray having a concave portion that accommodates an article and an arc-shaped wall portion that absorbs loads from front, rear, left, and right, and a concave portion that similarly accommodates an article and It is an article storage device comprising a lid-like second tray having an arcuate wall portion that absorbs a load, and a protrusion that absorbs a load in the vertical direction on the outer peripheral surface of the first and second trays and the protrusion By using the configuration that forms the arch-shaped corners that support the article, it is possible to absorb the load from the vertical direction of the article by the deformation of the protrusions and the corners.

JP 2003-1555066 A

  In many cases, when a package or a packaging box is loaded and transported, a land route such as a truck is transported. At this time, the article is subjected to weak vibrations in the vertical direction due to road surface unevenness or the like. The article storage device disclosed in Patent Document 1 is mostly affected by the deformation of the protrusions and the corners provided on the outer peripheral surface with respect to vertical impacts and large vibrations caused by falling of the device itself or collision with falling objects. It is possible to absorb.

  However, weak vibrations in the vertical direction are repeatedly applied to the packaging box, and depending on the material characteristics of the packaging box and the cushioning material, there are cases where the vibration cannot be sufficiently deformed and cannot be damped. In the holding bodies 2a and 2b shown in FIGS. 1 (a) and 1 (b), as described above, the protrusions 4 that reduce the area for transmitting such vibrations are provided. Therefore, the transmitted vibration acts directly on the article 1. Further, in the article storage device disclosed in Patent Document 1, the arch-shaped corners that support the protrusions are repeatedly loaded, although the function of preventing the buckling deformation of the protrusions due to impact is described. As for the weak vibration, there is a problem that it cannot return to its original state after deformation and cannot absorb the vibration.

  In addition, in order to protect the article from the above-mentioned weak vertical vibration, methods such as using a vibration absorbing material or attaching a protective film to the surface of the transported goods are used. Films are very expensive compared to general cushioning materials, and in addition, since both films become waste after transportation and unpacking, transportation costs increase.

  Accordingly, an object of the present invention is to provide an impact-absorbing packaging material capable of absorbing an impact while appropriately holding an article and elastically deforming to attenuate vibration during transportation.

  In order to achieve this object, the present invention provides a shock-absorbing packaging material for protecting an article as described in claim 1, having an opening for fitting with the outer shape of the article, and having an external force. The external force is absorbed by being deformed with respect to the load, and is configured to have a protrusion that protrudes from the outer peripheral surface and can be elastically deformed. According to such a configuration, it is possible to realize an impact-absorbing packaging material that can appropriately hold an article to absorb an impact and elastically deform to attenuate vibration during transportation.

  The impact-absorbing packaging material according to claim 1 is configured such that, for example, as described in claim 2, the protrusion has a substantially L-shaped cross section including a support portion and a beam portion. You can also. According to such a configuration, the entire protrusion has a cantilever structure, and the elastic deformation of the protrusion is facilitated.

  The impact-absorbing wrapping material according to claim 2 is a point contact between the surface where the external force is transmitted to the beam portion and the projection portion, as described in claim 3, for example. You may comprise so that it may become. According to such a configuration, the vibration damping effect can be enhanced because the vibration frequency range to be transmitted can be limited particularly when a weak vibration is loaded.

  ADVANTAGE OF THE INVENTION According to this invention, the impact-absorbing packaging material which can hold | maintain articles | goods appropriately, can absorb an impact, and can elastically deform and can attenuate the vibration at the time of transportation is realizable.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  First, Embodiment 1 according to the present invention will be described in detail with reference to the drawings. In addition, since the impact-absorbing packaging material used in the first embodiment has the same left and right configurations that are fitted from both ends of the article 1 as in the conventional arrangement shown in FIG. The packaging material 12a will be described as an example.

  FIG. 2 is a schematic diagram showing the configuration of the shock absorbing packaging material 12a according to the first embodiment, and FIG. 2 (a) is a plan view seen from the direction of fitting with the article 1, and FIG. FIG. 3 is an enlarged view of a region indicated by a dotted line A1 in FIG. The shock absorbing packaging material 12a has a substantially box shape including the opening 13a, and is formed using a synthetic resin material such as foamed polystyrene. As shown in FIG. 2A, on the outer surface of the shock absorbing packaging material 12a, there are an upper protrusion 14a that absorbs an impact from above and a lower protrusion 14b that absorbs an impact and vibration from below. Is formed.

  As shown in FIG. 2B, the lower protrusion 14b includes a support 15 protruding from the main body of the shock absorbing packaging material 12a and a beam protruding laterally from the support 15 so as to form a substantially L-shaped cross section. Part 16. The lower protruding portion 14b has a cantilever structure protruding from the shock absorbing packaging material 12a by the support portion 15 and the beam portion 16, and stress or vibration, that is, external force S shown in FIG. If it does, it will elastically deform from the no-load state position P1 (dotted line position of FIG.2 (b)) to the load state position P2. By this elastic deformation, the impact-absorbing packaging material 12a of the first embodiment can sufficiently absorb the weak repeated vibration transmitted from the lower side. When an external force S exceeding the elastic deformation limit of the lower protrusion 14b is applied, the lower protrusion 14b first plastically deforms while absorbing a part of the impact, and then the packaging material 12a. The main body can be absorbed by deformation.

  Next, a second embodiment of the present invention will be described in detail with reference to the drawings. Since Example 2 also has the same configuration on the left and right, one packaging material 12a will be described as an example.

  FIG. 3 schematically shows the structure of the impact-absorbing packaging material 12a according to the second embodiment. FIG. 3 (a) is a plan view seen from the direction of fitting with the article 1, and FIG. FIG. 4 is an enlarged view of a region indicated by a dotted line A2 in FIG. Almost the same as the configuration of Example 1, the impact-absorbing packaging material 12a has a substantially box shape including an opening 13a, and is formed using a synthetic resin material such as foamed polystyrene. Further, as shown in FIG. 3 (a), on the outer surface of the shock absorbing packaging material 12a, there are an upper projection 14a that absorbs impact from above and a lower projection 14b that absorbs impact and vibration from below. And are formed.

  As shown in FIG. 3B, the lower protrusion 14b includes a support 15 protruding from the main body of the shock absorbing packaging material 12a, and a beam protruding laterally from the support 15 so as to form a substantially L-shaped cross section. Part 16. The lower protruding portion 14b has a cantilever structure protruding from the shock absorbing packaging material 12a by the support portion 15 and the beam portion 16, and in the same manner as in the first embodiment, the stress or vibration, that is, the external force S is on the lower side. Is loaded, the elastic deformation occurs from the unloaded state position to the loaded state position. In the second embodiment, a convex portion is formed on the bottom surface side of the beam portion 16. Thereby, the external force applied to the beam portion 16 is first transmitted or loaded at the vertex 17 of the convex portion. By elastically deforming in a manner close to a point contact in this way, the natural frequency of the vibration transmitted from the lower protrusion 14b can be limited. It is possible to effectively attenuate the weak repeated vibration transmitted from the lower side.

  As an example of the effect of the embodiment according to the present invention, in FIG. 4, using the conventional holding bodies 2a and 2b shown in FIG. 1 and the shock absorbing packaging materials 12a and 12b according to the embodiment 2 shown in FIG. The result of the response characteristic test implemented using the vibration testing machine is shown. Here, FIG. 4 (a) shows a case where conventional holding bodies 2a and 2b are used, and FIG. 4 (b) shows a case where shock absorbing packaging materials 12a and 12b according to this embodiment are used. In the vibration test, a linear vibration type vibration tester (not shown) is used, and a wooden packing material with a weight of 1.7 kg is fitted to each holding body, held, and fixed to the testing machine. went. The test condition is a top-to-bottom vibration, with an amplitude of 2 mm (constant) loaded for 1 minute (constant), and the maximum amplitude value of the article is measured every 0.1 Hz with an amplitude frequency of 5 to 50 Hz using an acceleration sensor. did.

  When the conventional holding bodies 2a and 2b were used, a response waveform having a maximum amplitude value of 7.4 mm at 26.2 Hz was obtained as shown in FIG. This is considered to be because the resonance occurred when the natural vibration frequency was 26.2 Hz when the article 1 and the holding bodies 2a and 2b were combined, and thus the response was greater than the vibration amplitude. On the other hand, when the shock absorbing packaging materials 12a and 12b according to Example 2 are used, the maximum amplitude value of 2.9 mm is obtained at 17.8 Hz under the same test conditions as shown in FIG. A response waveform was obtained. From this, the shock absorbing wrapping materials 12a and 12b according to Example 2 have both a peak response frequency and a maximum amplitude value smaller than those of the conventional holding bodies 2a and 2b, and a frequency of 25 Hz or more. In the range, the amplitude became more significant as the frequency increased, and the result was that the response amplitude was about 0.1 mm near 50 Hz. That is, the impact-absorbing packaging material 12a according to the second embodiment has an effect of reducing the height and the number of times of movement (bounce) of the article 1 in the vertical direction compared to the case where the conventional holding body 2a is used. Furthermore, it can be seen that the higher the vibration frequency, the more effective it is to attenuate the transmitted vibration. In addition, when the shock absorbing packaging materials 12a and 12b according to the second embodiment are used, the scratches generated between the article and the holding body are reduced as compared with the case where the conventional holding bodies 2a and 2b are used. Was also obtained.

  By adopting the above-described configuration, it is possible to provide an impact-absorbing packaging material that can appropriately hold an article to absorb an impact and elastically deform to attenuate vibration during transportation.

  In the impact-absorbing packaging material 12a shown in Example 1 and Example 2 above, the configuration of the protrusion according to the invention is provided only on the lower side, but this protrusion is on the upper side, the side surface, or the front surface. On the contrary, the present invention may be applied only to a surface requiring vibration absorption performance as in the embodiment. In the examples, foamed polystyrene is used as the material for the impact-absorbing packaging materials 12a and 12b. However, any synthetic resin material may be used, and foamed polyethylene is particularly suitable because of its high breaking strength.

  The first and second embodiments described above are merely examples of the best mode for carrying out the present invention, and the present invention can be implemented with various changes and modifications without departing from the gist thereof.

FIG. 1 (a) is a perspective view of the entire arrangement, and FIG. 1 (b) shows one holding body 2a fitted to the article 1; FIG. It is the top view seen from the direction to unite. The structure of the impact-absorbing packaging material 12a by Example 1 of this invention is shown typically, FIG.2 (a) is the top view seen from the direction fitted with the articles | goods 1, FIG.2 (b) is a figure. It is an enlarged view of the area | region shown by the dotted line A1 in 2 (a). The structure of the impact-absorbing packaging material 12a by Example 2 of this invention is shown typically, FIG.3 (a) is the top view seen from the direction fitted with the articles | goods 1, FIG.3 (b) is a figure. It is an enlarged view of the area | region shown with the dotted line A2 in 3 (a). FIG. 4A shows a response waveform obtained by a response characteristic test using a vibration tester. FIG. 4A shows the case of using the conventional holding bodies 2a and 2b, and FIG. The waveforms when 12a and 12b are used are shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Article 12a, 12b, Shock-absorbing packaging material 13a Opening part 14a Upper projection part 14b Lower projection part 15 Support part 16 Beam part P1 (of lower projection part 14b) Unloaded state position P2 (of lower projection part 14b) Load position S External force

Claims (3)

An impact-absorbing wrapping material for protecting an article, having an opening for fitting with the outer shape of the article, and absorbing the external force by deforming against an external force load, protruding from an outer peripheral surface, and elastic An impact-absorbing packaging material having a deformable protrusion. The impact-absorbing packaging material according to claim 1, wherein the protruding portion has a substantially L-shaped cross section including a support portion and a beam portion. The impact-absorbing packaging material according to claim 2, wherein a convex portion is further provided on the beam portion, whereby a point contact is formed between a surface to which an external force is transmitted and the projection portion.

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