JPH0422795B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to improving the compressive strength of a multi-layer package formed from a multi-layer package mainly made of corrugated cardboard boxes and/or carton, and more specifically, the present invention relates to improving the compressive strength of multi-layer packages formed from multi-layer packages mainly made of cardboard boxes and/or carton. The two-fold packaging body is constructed by combining them in such a way that the inherent compressive strength of each body can be utilized to the maximum extent within the range that neither buckling occurs, and the double packaging body is housed in an inner body made of a carton or cardboard box. The present invention relates to the structure of a multilayer package that can safely and reliably protect the contents contained therein. Conventionally, when transporting or storing multi-layer packaging bodies mainly made of cardboard boxes and/or carton, it has been compressed to withstand a predetermined load during loading. In order to provide strength, various improvements have been made, such as increasing the strength of the materials used in cardboard boxes and carton, and improving their structures. However, all of these conventional improvement measures for increasing the compressive strength focus on increasing the strength of individual cardboard boxes or cartons, and the multilayer packaging that is the final distribution form does not have individual strength. At present, the total reinforcing effect imparted to the package is not fully utilized. Therefore, the present inventors did not aim to increase the strength of a multilayer package by increasing the strength of each package individually, as in the conventional example, but instead aimed to increase the strength of each package by maximizing the original strength of each package. In order to achieve this by fully utilizing the sum of the two layers, we focused on the combination of double layers of the packages that form a multi-layer package, from a completely different perspective than before. We carried out intensive research. As a result, if double wrappings arbitrarily selected from among the wrappings are combined so that they buckle at the same time as possible due to external loads, the compressive strength originally possessed by each wrapping can be overcome. It has also been found that it can be used in a comprehensive manner, and that the strength of multilayer packaging can be most effectively enhanced. Furthermore, as a specific form, in a double packaging body that is arbitrarily combined, the lower end of the top surface of the packaging body that exists as an exterior body (hereinafter referred to as an exterior body) and the package that exists as an inner body By setting the distance D between the upper end of the top surface of the body (hereinafter referred to as the inner body) based on the difference in the amount of compression between the outer body and the inner body, the buckling points of both packaging bodies can be made to be approximately the same. They also found that it could be made possible, and completed the present invention. The multilayer packaging of the present invention will be described below, along with a comparison with conventional products. The multilayer packaging body 1 is made up of a conventional cardboard box 2 and a carton 3, which is its interior, in order to avoid wasting the cardboard material used and to suppress vertical shaking of the carton during transportation. As shown in Figures 1 and 2,
When the carton 3 is packed in a predetermined combination into the cardboard box 1 and the cardboard flap 4 is closed,
The dimensions of the cardboard box are designed to match the dimensions of the carton so that there is no gap between the top surface of the carton and the top surface of the cardboard box, in other words, so that they are in contact with each other. Many of them can be seen packed in boxes. FIG. 3 shows a compressive strength development pattern when a compressive load is continuously applied from above to a conventional multi-layer package according to such a packaging mode. In Fig. 3, the vertical axis represents the compressive stress developed for each of the cardboard box 2, carton 3, and multilayer packaging 1, and the horizontal axis represents the amount of compression (distance the compression platen descends). be. This compression test shall basically be conducted in accordance with the Japanese Industrial Standards (JIS) "Compression Test Method for Packaged Cargoes and Containers" (Z0212-1976). 10Kg for uniform contact
An initial load of is applied, and this point is taken as the starting point of the compressive stress and amount of compression. In addition, the compression plate descending speed in the compression testing machine was 10 mm/min, and among the test products, cardboard box 2 was used as an empty box with the lid closed, and carton box 3 was tested as shown in Figure 4. By partially surrounding the carton from above and below with the central part of the side surface of the cardboard box cut out on all sides, the compressive strength of the cardboard box is not involved, and moreover, when forming a multi-layer package, A compression test was conducted under exactly the same conditions. In Fig. 3, the peak point A of the compressive strength development curve a of the corrugated box or the first bending point B of the compressive strength development curve b of the carton corresponds to buckling (the box deforms due to the inability to withstand the compressive load). damage) points. Note that the carton is usually recognized by the continuation of the buckling line e on either side of the carton, as shown in FIG. In addition, usually with compressive stresses A' and B' corresponding to the above points A and B,
This is the compressive strength of a cardboard box or carton. In the figure, c shows the compressive strength development curve of the multilayer package. In other words, this curve corresponds to a composite curve of curves a and b, but before the compression amount reaches peak point C of curve c, that is, B
At point B'', which is the amount of compression corresponding to point B'', damage has already occurred to the carton, which is the inner body, and its commercial value is lost (because the content protection function of the cardboard box is lost). , B'' point, that is, the compressive stress O' corresponding to the O point on the curve c, should be taken as the compressive strength of the multilayer package. Therefore, in such a conventional multilayer packaging body 1, the compressive strength of the carton 3 is fully utilized as its compressive strength, but as for the compressive strength of the cardboard box 2,
It cannot be said that all of this is utilized as the strength of the multilayer packaging body 1. In contrast, the multi-layer packaging according to the present invention makes the amount of compression at the buckling point of the corrugated box match the amount of compression at the buckling point of the carton, that is, by buckling both at the same time. In particular, it is formed so that the sum of the compressive strengths of both can be utilized as it is as the compressive strength of the multilayer packaging body. As a specific means for making the buckling points coincide with each other, the inventors of the present invention have developed a structure between the lower end of the top surface of the cardboard box, which is the exterior body, and the top end of the carton, which is the interior body, as shown in FIG. In Fig. 3, A″−
By providing an interval of B'', that is, an interval D corresponding to the difference in the amount of compression between the corrugated box and the carton at the time of buckling, the starting point of compressive stress in the carton is set from A''-B to that of the corrugated box. The compressive strength development pattern shown in FIG.
As shown in the figure, it is expressed as the sum of the compressive strengths of the cardboard box and the carton, that is, the compressive stress C' corresponding to point C on the curve c. The multi-layer packaging object of the present invention refers to a packaging body mainly composed of a cardboard box and/or a carton and having a double or more multi-layer structure, such as shrink packaging, which can be ignored in terms of strength. This also includes items that have a packaging body, or items that have reinforcing paper such as cardboard or paperboard between the packaging bodies. Furthermore, regarding the assembly structure of each package itself,
The present invention is not limited in any way. For example, regarding the closing position of a cardboard box, there is a case where a flap 4 is present on the top surface as shown in FIGS. The present invention can be applied to any type of flap having a flap 4 on its side as shown in FIG. The present invention is not limited in any way to the manner in which the exterior body is closed, and may be determined by the closing order of the flaps shown in FIG. 1 or by the closing order of the long flaps 5 as shown in FIGS. It can also be applied to an embodiment in which the lid is closed first, that is, with the long flap 5 serving as the inner flap. When the lid is closed as shown in Figures 9 and 10, the inner flap covers the entire area of the top of the carton, as shown in Figure 11, so when a load is applied, the top of the carton closes against the inner flap. As a result of the carton being in full contact with and receiving a load through the entire top surface, the carton develops more compressive stress and has a higher compressive strength compared to the closed lid configuration shown in Figure 1. . As a result, the compressive strength of the entire multilayer package is increased, which is even more preferable. Next, the top surface of the present invention refers to the surface that becomes the ceiling surface when the multilayer package is formed and then shipped, such as during loading. In order to increase the compressive strength against loads from above, corrugated boxes are loaded, stored or transported with the vertically flowing surfaces of the corrugated cardboard boxes forming sides or tabs. This is the normal usage. In the multi-layer packaging of the present invention, when the top surface of the exterior body is formed by a flap, the lower end of the top surface of the exterior body corresponding to the interval D refers to the lower end of the innermost flap; D refers to the distance between the lower end of the innermost flap and the upper end of the top surface of the interior body when the flaps other than the innermost flap are closed and the innermost flap is in a horizontal state. In addition, when the inner body is a carton and the top surface of the carton is formed by the flap 4 when forming a multilayer package, as shown in FIG. 12,
In many cases, the top surface curves outward and has a bulge, but since this has little effect on the compressive strength, this bulge can be ignored and the edge of the carton Let D be the distance from the upper end at 6. Next, a relational expression for deriving the distance D between the lower end of the top surface of the exterior body and the upper end of the top surface of the interior body defined by the present invention,
In other words, explain [l _a -l _b + (n-1) d ₀ + d ₁ ] (1-0.5) ≦ D ≦ [l _a - l _b + (n-1) d ₀ + d ₁ ] (1 + 0.5). do. In addition, in the above formula, l _a
indicates the amount of compression when the exterior body is buckled, and
l _b indicates the amount of compression when the inner body is buckled. Measurement of compression amount of inner and outer packaging and multi-layer packaging
The compression test shall be conducted using the above-mentioned compression test method in accordance with JIS.For the exterior body, an empty box with the lid closed is subjected to the test in the same state as when shipped, and for the interior body, the test is conducted as described above. A compression test was conducted using the same method as in the compression test (FIG. 4), without involving the compressive strength of the outer package itself, and under exactly the same conditions as when forming a multilayer package. In the present invention, the buckling points of the inner and outer bodies are
If the exterior body is a cardboard box, it is indicated by the peak point on the compressive strength development curve recorded by a self-recording device, and if multiple peaks are indicated, the first peak point is indicated. Let it be the buckling point.
If the inner and outer shells are made of carton, the first bending point or peak point shown in the compressive strength development curve, or the buckling line that appears on the side of the carton, is approximately joined on one side. The buckling point is defined as the point at which the buckling point occurs. Next, n in the formula indicates the number of layers of cardboard or carton paper that forms the top surface of the exterior body, that is, the number of overlapping sheets of cardboard or carton paper on the top surface, such as the cardboard box shown in Figures 1 and 2. In addition, when the top surface is formed of inner and outer flaps and has a double structure (including cases where the structure is partial), the number of polymerizations n is 2. Furthermore, when the flap 4 is located on the side surface as in the case of the cardboard box shown in FIG. n is 1. In the formula, d ₀ indicates the thickness of the cardboard or carton paper that makes up the exterior body, and d ₁ indicates the thickness of the reinforcing paper if corrugated paper or cardboard is inserted between the inner and exterior bodies as reinforcing paper. In addition to showing
If the inner body is shrink wrapped, etc., the thickness including the shrink wrapping paper, etc. is also indicated. As described above, the present invention sets the distance between the lower end of the top surface of the exterior body and the upper end of the top surface of the interior body to have a difference in the amount of compression between the exterior body and the interior body, that is, l _a -l _b . This is a basic configuration requirement. However, as mentioned above, the amount of compression in the present invention is 10
Since the measurement is performed with the initial load of kg being applied as the starting point of the compression amount, if the top surface of the exterior body is formed by a flap, as shown in Figure 13,
Measurements are taken with the inner flap 7 pushed inward by the outer flap 8 by approximately the thickness of the outer flap 8 (that is, the thickness of the cardboard). Then, instead of the interval D in the calculation formula, la _- l _b is calculated as the interval D' in this case. That is, if the number of polymerizations of flaps is n, then
The innermost flap of the outer shell will be pushed inward by (n-1)× _d0 minutes. Furthermore, as shown in FIG. 14, between the interior and exterior bodies,
When reinforcing paper 9 such as cardboard is interposed, l _a - l _b is calculated as a value indicating the distance D'' between the lower end of the top surface of the exterior body and the upper end of the reinforcing paper. Therefore, in the present invention, l _a
In order to adjust the interval D' or D'' calculated as -l _b to the interval D referred to in the present invention as specified above, (n-1) d ₀ and d ₁ are added to l _a -l _b . Even if the top surface of the exterior body is formed by a flap, the ruled line (bent part) 13 provided for closing the inner flap, as shown in FIG. , is located below the ruled line for the outer flap, and therefore the inner flap is not pushed into the interior even when an initial load of 10 kg is applied, as shown in Figures 13 and 14. In this case, D is calculated as l _a - l _b , so the above-mentioned adjustment related to the addition of (n-1)d ₀ is not necessary. Based on this, a coefficient indicating the lower limit at which the effect of the present invention can be effectively exerted is added to the derived D value, that is, (1
-0.5), and the coefficient indicating the upper limit of the D value that can effectively contribute the compressive strength of the inner body to the compressive strength of the multilayer packaging body, that is, (1 + 0.5), which is multiplied by the above-mentioned 2 The D value range in which the effects of the present invention can be effectively achieved is shown below. Among the above D value ranges, when setting the D value range by setting the coefficient for the lower limit as (1-0.2) and the coefficient for the upper limit as (1+0.2), multiplying the compression amount difference by each of them. , the effects of the present invention are even more pronounced. (The above coefficients were obtained based on the results of repeated compression tests on a large number of packaging types.) is not limited to double-layered multi-layered packaging, but can also be applied to multi-layered packaging with a substantially triple-layered structure or more, with cardboard boxes and/or carton as the main packaging, and Its strength can be increased. In addition, when the multi-layer packaging body has a triple-layered structure or more, the selection of the exterior body is arbitrary in relation to the distance D between the two packaging bodies as referred to in the present invention, that is, the desired two packaging bodies are selected and the By setting the interval D between the top surfaces of It becomes possible to increase the strength of the package. To explain this with reference to the drawings, for example, in a triple-layered multi-layer package made of a cardboard box and/or carton, the number of cases depends on which package is selected as the outer package or the inner package in the present invention. Three types of spacing D as shown in Figures 15 to 17
settings can be made. When the interval D is set as shown in FIG. 15, that is, in the case where the packaging body 10 forming the outermost layer is selected as the exterior body, and the packaging body 11 forming the middle layer is selected as the interior body, In this case, the strength of the double package formed by the package 10 and the package 11 is increased, and thus the strength of the multilayer package is increased. However, in identifying the buckling point of the inner body in this case, from the viewpoint of protecting the package 12 forming the innermost layer, which should pay the most attention to damage prevention, the buckling point shown in the compressive strength development curve should be determined. with the first bending point or peak point, or the package 1
1. The buckling point is defined as the point at which the buckling lines generated on one side of the package 12 are almost joined at one side. Further, when the distance D is set as shown in FIG. 16, the strength of the double package formed by the package 11 forming the middle layer and the package 12 forming the innermost layer is increased, and In the case of Figure 17,
By increasing the strength of the double package formed by the package 10 forming the outermost layer and the package 12 forming the innermost layer, in either case, the multilayer package as the object of the present invention can be achieved. The strength can be increased. In the above-described three-layer packaging, the distance D is set as in the three examples depending on whether emphasis is placed on the buckling point of the carton 12 or on the packaging 11 forming the middle layer. This is because the object of the interior body is determined, and similarly, the exterior body will also change depending on which aspect is prioritized. In either case, the interior body is determined depending on whether the product displayed at the store is a carton or an inner layer packaging, and when the interior body buckles, the product value is determined. is considered to have been lost. In order to further clarify the effects of the present invention, a multilayer packaging body having a cardboard box as an exterior body and a carton as an interior body was used as a sample, and the distance D between the lower end of the top surface of the exterior body and the upper end of the top surface of the inner body was set to 0. Comparative experiments were conducted by subjecting each specimen to a compression test to measure the compressive strength of the multilayer packaging body, with various sizes ranging from 18 mm to 18 mm. As shown in Fig. 1, the lid of the cardboard box is closed by forming the top surface with two flaps, an inner flap and an outer flap, and the thickness of the cardboard box is 5 mm.
With the outer flap open and the inner flap in a horizontal position, the distance from the lower end of the inner flap to the upper end of the carton was measured. In addition, as for the compressive strength of the multilayer packaging body, the compressive stress at the time when either the cardboard box or the carton buckled was considered as the compressive strength. Table 1 shows the compression test results.

[Table] In addition, the range of the distance D in the present invention, which is calculated by substituting the amount of compression when the corrugated box and carton buckle into the relational expression defined in the present invention, is as follows:
In the case of this example, n = 2, d ₀ (cardboard thickness) = 5
Since mm, d ₁ (thickness of reinforcing paper, etc.) = 0, [12-10 + (2-1) 5] (1-0.5) mm≦D≦ [12-10 + (2-1) 5] (1 + 0 .5) mm i.e.
3.5 mm≦D≦10.5 mm, and among the above samples, samples Nos. 3 to 8 correspond to this and are included in the scope of the present invention. As is clear from the above comparative experiment, samples Nos. 3 to 8 according to the present invention, in which the interval D was set within the numerical range derived by the relational expression of the present invention, are different from sample No. 1, which deviates from the numerical range. ~2 or No.9
It can be seen that the compressive strength is significantly enhanced compared to No. 13. As explained above in detail, the present invention aims to increase the strength of multilayer packaging from a completely different perspective from the conventional improvement measures by strengthening the material of the inner and outer packaging materials themselves. The multi-layer packaging body according to the present invention has been developed by focusing on the combination of bodies, and the multi-layer packaging body according to the present invention maximizes the inherent compressive strength of the inner and outer packaging to the extent that buckling does not occur in either of them. It was possible to obtain significantly enhanced compressive strength without any attempt to strengthen the material of the packaging material itself, and its contribution is extremely high in terms of distribution costs. That is, when the composite packaging according to the present invention is used for distribution, it is possible to increase the number of stacked cardboard boxes on a pallet compared to conventional packaging, but the packaging is thinner than conventional cardboard. Even if the material is used, it is possible to obtain sufficient strength as a multi-layered packaging, so the weight of the packaging can be reduced, and the strength of corrugated paper is one rank lower than that of conventional packaging. This also makes it possible to reduce packaging costs, and it also makes it possible to obtain a composite package and a package that is no different from conventional packaging in terms of ensuring the safety of the contents. be.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a multi-layer packaging body, Fig. 2 is a vertical cross-sectional side view of a conventional multi-layer packaging body, and Fig. 3 is a diagram showing a compressive strength development pattern exhibited by a conventional multi-layer packaging body. , FIG. 4 is a longitudinal cross-sectional side view of the carton during a compression test, FIG. 5 is a longitudinal cross-sectional side view of the carton during buckling, FIG. 6 is a longitudinal cross-sectional side view of the multilayer packaging body of the present invention, and FIG. The figure shows the compressive strength development pattern exhibited by the multi-layer packaging body of the present invention, FIG. 8 is a perspective view of the multi-layer packaging body in which the flap is located on the side, and FIG. FIG. 10 is a perspective view of the multi-layer package in which the long flap is closed first; FIG. 11 is a longitudinal cross-sectional side view of the multi-layer package shown in FIG. 10; Fig. 12 is a side view of a carton whose top surface is formed by a flap, Fig. 13 is a partially cutaway longitudinal sectional view of the composite layer of the present invention when an initial load is applied in a compression test, and Fig. 14 is a side view of a carton whose top surface is formed by a flap. FIGS. 15 to 17 are partially cutaway vertical sectional side views of the composite layer of the present invention containing reinforcing paper at the time of applying an initial load in a compression test; FIG. 18 is a partially cutaway vertical sectional side view when an initial load is applied in a compression test. 1...Multilayer packaging, 2...Cardboard box, 3...
Calton, 4...flap, 5...long flap,
6...Calton edge, 7...Inner flap, 8...
Outer flap, 9...Reinforcement paper, 10, 11, 12...
...Package, 13...Ruled line.

Claims (1)

[Scope of Claims] 1. In a multi-layer package formed from multi-layer packages mainly made of cardboard boxes and/or carton, in an arbitrarily selected double package,
The distance D between the lower end of the top surface of the exterior body and the upper end of the top surface of the interior body is expressed by the following formula: [l _a −l _b +(n-1)d ₀ +d ₁ ](1-0.5)≦D≦ [l _a −l _b +(n-1)d ₀ +d ₁ 〕(1+0.5) However, l _a ; Amount of compression at the buckling point of the exterior body l _b ; Amount of compression at the buckling point of the interior body n; A multilayer packaging body characterized in that the polymerization number d ₀ of the corrugated board or carton paper material to be formed; the thickness d ₁ of the corrugated board or carton paper material; and the range determined from the thickness of reinforcing paper, etc.