JPH0788084B2 - Wraparound case - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wraparound case formed by box-making using a composite corrugated body formed by adhering a flat plate liner material to a corrugated core body.

<Prior Art> As a conventional composite corrugated body, a corrugated core is formed by arranging a large number of corrugated rows formed by alternately providing vertical peaks and troughs on a sheet material in a plane straight line. ,
A single-sided cardboard in which a flat plate liner is bonded to one surface of this corrugated core or a double-sided cardboard in which a flat plate liner is bonded to both surfaces of a corrugated core is known.

When comparing the single-sided cardboard and the double-sided cardboard, it is considered that the single-sided cardboard is used for the wraparound case because the single-sided cardboard is far more advantageous in terms of cost. Then, in order to make a wraparound case 5 as shown in FIG. 11 (B) using this single-sided cardboard 1, normally, as shown in FIG. 11 (A), the corrugated row 2-2 is used. Oriented in the longitudinal direction and cut into a predetermined size and attached ruled lines,
Supply to an automatic box making machine to make a box.

<< Problems to be Solved by the Invention >> However, in the conventional single-sided cardboard, the in-plane compressive strength in the x direction orthogonal to the corrugated row 2 in FIG. 11 (A), that is, in the lateral grain direction of the cardboard is extremely low. turn into. Therefore, as shown in FIG. 11 (C), for example, when the corrugated rows 2 are arranged along the longitudinal direction of the case to form a wraparound case, the case is extremely weak against the load from above. Because,
Normally, it was necessary to cut as shown in FIG. 11 (A) and make a box as shown in FIG. 11 (B), and the cutting direction of the single-sided cardboard was limited. Furthermore, apart from this, the 11th
When a wrap-around case is made as shown in Fig. (B), if it is stacked vertically in the x direction, the case becomes extremely weak with respect to the load, and there is a problem that the load direction is restricted. It was

Also, in the conventional single-sided cardboard, the out-of-plane bending strength in the vertical plane direction orthogonal to the x direction in FIG. 10 is extremely low and it is easy to bend. Therefore, the dimension in the x direction in FIG. 11 (B) is extended from the predetermined size. It was practically impossible to create a wraparound case.

Since the in-plane compressive strength and the out-of-plane bending strength are low as described above, in the conventional wraparound case, the flap pieces (IV) (V) at the opening thereof are easily bent or bent and easily damaged. Become.

Furthermore, since the conventional one-sided cardboard has a low out-of-plane compression strength, sufficient cushioning properties cannot be obtained on each side of the case, and as a result, as a case for storing and carrying relatively heavy contents or a relatively large wraparound. It was totally unsuitable as a case.

In addition, in the conventional single-sided cardboard 1, since the joint portion between the corrugated strip 2-2 and the flat plate liner 4 is a flat linear shape along the mountain portion of the corrugated strip 2-2, this single-sided cardboard scoring If the part matches the parallel line part, it is easy to bend along that part, but if the other scoring parts are misaligned with respect to the parallel line part, accurate bending along the ruled line will occur. It was difficult.

That is, in the conventional single-sided cardboard, it is difficult to accurately bend the crease forming part of the corrugated row in the longitudinal direction (y direction), and the dimensional accuracy of the case is significantly impaired during the box making process. Only the part corresponding to the periphery of the above has a high cost structure such as a double-sided liner attached or a double core for reinforcement.

Also, the conventional single-sided cardboard is apt to warp and deform,
Stripe-shaped grooves are formed on the flat plate liner surface, resulting in poor printability.
It was not suitable for precision printing such as POS bars.

Further, as is clear from FIG. 11 (A), the unfolded sheet of single-sided cardboard for forming the wraparound case must be cut so that the corrugated column direction becomes the longitudinal direction, and thus the end pieces are cut off. It has been pointed out that there is a problem that the cutting is likely to occur and the cutting efficiency is lowered.

The present invention has been made in view of the above problems,
Its purpose is to have sufficient strength in all of in-plane compressive strength, out-of-plane bending strength and out-of-plane compressive strength, and therefore cut in any direction of the corrugated row without being constrained in the arrangement direction of the corrugated row. Can be made into a box, and has a large strength against a load applied in any direction, and can be made into an elongated box-shaped body, and accurate dimensional accuracy of the crease forming part can be obtained, and it is suitable for printing. It is to provide a wraparound case which is excellent and can improve the cutting efficiency.

<< Means for Solving the Problems >> In order to achieve the above object, in the wraparound case according to the present invention, a corrugated row is formed by alternately applying vertical peaks and troughs to the sheet material. Along with the corrugated rows meandering in a plane waveform, the amplitude ratio H / L (L: wavelength, H: amplitude) of each cross-sectional wave of the corrugated rows is set to 0.2 or more, and the corrugated rows between the corrugated rows in the planar shape are The meandering polymerization rate D / L (D: amplitude of plane meandering wave) is set to 0.5 or more, and further the meandering rate D / N (N:
(Wavelength of plane meandering wave) is 0.15 or more to form a corrugated core body, a flat plate liner is adhered to at least one surface of the corrugated core body to form a reinforced composite corrugated body, and the wraparound case is formed on the composite corrugated body. A ruled line is attached and the composite corrugated body is box-formed along the ruled line.

<Example> Hereinafter, a preferred example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an example of a single-sided reinforced composite corrugated body 10 constituting a wraparound case according to the present invention, which is composed of a corrugated core body 11 and a flat plate liner 12. The corrugated core 11 has a mountain portion M and a valley portion V in the vertical direction.
The corrugated ridges 13 formed by alternately applying the above-mentioned and are formed in the y-direction are meandered in a planar manner in the y-direction, and these corrugated ridges are parallel to each other. The flat plate liner 12 is integrally bonded to the corrugated row 13 at the mountain portion M of the corrugated row 13.

The shape of the corrugated strips 13 of the corrugated core body 11 is defined by the amplitude ratio H / L, the meandering polymerization ratio D / L, and the meandering ratio D / N in FIG. Here, the amplitude ratio H / L indicates the relationship between the amplitude H and the wavelength L of the cross-sectional wave obtained by cutting the corrugated row 13 along the vertical plane in the x direction in FIG. 1, and FIG.
(F) shows the amplitude ratio when H is kept constant and L is variously changed. As is clear from this figure, the cross-sectional wave makes an angle θ with the bottom surface as the amplitude increases.
Can be said to increase gradually, and as a result, the strength with respect to the out-of-plane compressive force applied vertically downward from the apex of the sectional wave increases in proportion to the angle θ. When H / L is too small, not only the out-of-plane compressive strength is small, but also the distance between adjacent corrugated rows is naturally increased, and the number of corrugated rows included in the corrugated core body of a predetermined area is increased. Also less. Therefore, the practical range is H / L ≧ 0.2.

As shown in FIG. 1 and FIG. 3, the meandering polymerization rate D / L shows the relationship between the amplitude D of each corrugated strip and the wavelength L of the cross-sectional wave when the corrugated strip is viewed in plan. Shows.

Here, FIG. 3A shows the joining state between the adjacent corrugated strip rows 13a and 13b and the flat plate liner 12 when the amplitude D and the wavelength N of the plane wave of the corrugated strip are kept constant and the wavelength L of the sectional wave is sequentially changed. )-(E). These drawings (A) to (E) show the corrugated rows in a plan view, and the tops of the corrugated rows 13a and 13b adjacent to each other in the x direction.
M ₁ and M ₂ are shown by a solid line in a meandering shape, the valley bottom V of both rows is shown by a dotted line, S ₂ is an upper tangent of the valley bottom V, S ₃ is a central transverse line of the valley bottom V, B is a single-sided reinforced composite corrugated body 10
Shows the bottom surface of.

When D / L = 0.4 in FIG. 3 (A), at the cross-sectional position along the line S ₁ , as shown in FIG. 3 (A1), the corrugated strip 13
Only the top portion of a is joined to the flat plate liner 12 at equal intervals with the wavelength N of the corrugated strip, and the whole is in a state of being lifted from the bottom surface B of the composite corrugated body. On the other hand, S ₂
As shown in FIG. 3 (A2), the corrugated strips 13a have the valley bottom portions V at the same level as the wavelength N and at the same level as the bottom surface B of the composite corrugated body at the cross-sectional position along the line. Separated from. At the cross-sectional position along S ₃ , as shown in FIG. 3 (A3), both corrugated strips 13a and 13a
The central portion of b is at the same level as the bottom surface B of the composite corrugated body at an interval of 1/2 of the wavelength N, but the whole is largely separated from the flat plate liner 12 as in the case of the sectional position along the line S ₂ above. is doing.

Thus, when D / L = 0.4, when cut in the y direction at an arbitrary position orthogonal to the x direction, the corrugated strip at the cut position is floating from the bottom surface B of the composite corrugated body or separated from the flat plate liner 12. ing. Such a state always occurs when D / L <0.5.

That is, when the cross sections (A ₁ ), (A ₂ ), and (A ₃ ) of the single-sided reinforced composite corrugated body with D / L <0.5 are viewed as a truss structure,
Since there is no portion where the portion corresponding to the web of the truss extends to the entire wall thickness (T) of the composite corrugated body, the first truss structure has a low bending strength in the vertical direction orthogonal to the x direction.

Then, when the D / L = 0.5, as shown in FIG. 3 (B), S ₁
The line and the line S ₂ are overlapped with each other, and at the cross-sectional position along the lines S ₁ and S ₂ , as shown in FIG. 3 (B1), the corrugated strip 13a is joined to the flat plate liner 12 at equal intervals with the wavelength N. At the same time, it is at the same level as the bottom surface of the composite corrugated body 10. Thus, when D / L = 0.5, when D / L = 0.4, other D / L
Compared to the case of L <0.5, when the cross section along the S ₁ / S ₂ line is viewed as a truss structure, the web of the truss extends to the entire thickness of the composite corrugated body, and D / L < It can be said that the structure changed to the second truss structure, which is qualitatively different from the case of 0.5, and the out-of-plane bending strength in the y direction is significantly increased as a whole. That is, in the second truss structure, the angle of inclination of the web of the truss becomes steep, and the number of triangular truss units composed of the web material (the line segment of the inclining corrugated body) and the flange material (horizontal flat liner) becomes steep. Is increasing.

And, as a further strengthened one without changing the quality of the second truss structure, it is formed so that D / L exceeds 0.5, for example, D / L = 0.8, and FIG. 3 (C1) and As is clear from (C2), regarding the unit length in the y direction of the cross section between the S ₁ line and the S ₂ line, the location where the corrugated strip 13a is joined to the flat plate liner 12 and the bottom surface of the composite corrugated body are the same. The number of levels is increased, the truss configuration density is further increased, and the out-of-plane bending strength between the S ₁ line and the S ₂ line and also between the S ′ ₁ line and the S ′ ₂ line is increased. However, S ₁ line ~ S ' ₁
In the section between the lines (not including these lines), as is clear from FIG. 3 (C3) showing the cross-sectional state along S ₃ ,
The corrugated strips 13a and 13b at these cross-sectional positions are all separated from the flat plate liner 12.

Further, when D / L = 1.0, as shown in FIG. 3 (D), line S _{1 and} line S ₃ overlap, and at the cross-sectional position along this line, corrugated strips 13a and 13b have wavelength N. It is joined to the flat plate liner 12 at an interval of 1/2 of the above and extends in a corrugated shape to the bottom level B of the composite corrugated body. Therefore, D / L =
In the state of 1.0, FIG. 3 sections as shown in S ₁ line to S _'1 line in (C) disappears, in any cross-sectional position orthogonal to the x-direction, the corrugated strip 13a, 13b than the wavelength N It is joined to the flat plate liner 12 at a sufficiently small interval and extends to the bottom level of the composite corrugated body. When viewed as a truss structure, the truss is composite at any position orthogonal to the x direction. In order to extend the entire thickness of the corrugated body, the structure has changed to the third truss structure where the structure has undergone a further qualitative change compared to the case of 0.5 ≦ D / L <1.0, and the maximum out-of-plane bending strength is 0.5 ≦ Compared with the case of D / L <1.0, it will be further increased. That is, the web inclination angle of the unit triangular truss is steeper than that of the second truss structure, and more points are joined to the flat plate liner 12 or the bottom level B of the composite corrugated body is increased.
Further, the number of triangular truss units made of the web material and the flange material is further increased.

Furthermore, there is a third truss structure that has been further strengthened without changing its quality, such that the D / L exceeds 1.0 and becomes 1.2, for example. In this case, Fig. 3 (E1) ，
As shown in (E2), the wave front of the waveform extending between the flat plate liner 12 and the composite corrugated body is sharpened at an arbitrary cross-sectional position orthogonal to the x direction as compared with the case where D / L = 1.0, That is, the web inclination angle of the unit triangular truss becomes steeper, more joints are formed with the flat plate liner 12 or more portions reach the bottom level B of the composite corrugated body, and the out-of-plane maximum bending strength is further increased. This tendency is considered to increase in proportion to the increase in D / L.

The above relationship between the meandering polymerization rate D / L and the out-of-plane maximum bending stress index M is shown in a graph when the amplitude rate (H / L = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) is used as a parameter constant. As shown in the figure. That is, when D / L <0.5, each corrugated strip is separated from the flat plate liner 12 in the y-direction cross section at an arbitrary position in FIG. 1 or the bottom surface (B) of the composite corrugated body.
Out of plane bending strength is relatively small because
The truss structure of gradually increases as the D / L approaches 0.5. When D / L = 0.5, there is a part of the cross section of the corrugated strip in the y direction that is joined to the flat plate liner and is at the same level as the bottom surface of the composite corrugated body.
It suddenly shifts to a second truss structure, which is qualitatively different from the case of 0.5, whereby the increase rate of the out-of-plane bending strength becomes much larger than before. As the D / L increases beyond 0.5, it is joined to the flat plate liner as described above, and becomes the same level as the bottom surface of the composite corrugated body in the x-direction section of the y-direction cross section (S ₁ ~ in FIG. 3C). since the number of structurally advantageous triangular truss units S ₂ and between S _'1 ~ between ₂₎ gradually increases, a larger increase than in the case of D / L <0.5 If D / L exceeds 0.5 The maximum bending stress index increases with a steep slope. And when D / L becomes 1.0,
At any position in the y-direction cross section, the corrugated strip joins the flat plate liner and extends to the bottom level of the composite corrugated body, so 0.5 ≦ D here.
Compared with the case of /L<1.0, the transition to the third truss structure suddenly occurs again, and the out-of-plane bending strength is further increased. And D / L
As the value exceeds 1.0, the number of places where the corrugated strip joins the flat plate liner and the number of places where it extends to the bottom of the composite corrugated body increase. Therefore, the rate of increase is set to be larger than that when D / L <0.5. The steep slope results in an increase in the maximum bending stress index.

As is clear from the graph of FIG. 4, the preferable range for obtaining a large out-of-plane bending strength is D / L ≧ 0.5, and the most preferable range is D / L ≧ 1.0. And, as described above, the amplitude ratio H / L is 0.2 or more in a preferable range, so that the preferable range of the present invention satisfying both is D / L ≧ 0.5, H
It can be said that it is within the range indicated by the diagonal lines of /L>0.2.

Next, the meandering ratio D / which is the third element that defines the shape of the corrugated row 13 that constitutes the corrugated core body 11 according to the present invention.
Looking at N, this meandering ratio shows the relationship between the amplitude D and the wavelength N when each corrugated strip is viewed in a plane.
As is clear from FIG. 5, the corrugated strip meanders deeper (larger) as D / N increases when N is constant.

Here, for each of the corrugated strips (A) to (D), an angle α formed with the horizontal line in the y direction at the maximum inclination position of the meandering wave.
As for α, α increases as D / N increases, and the component in the x direction gradually increases in this meandering portion. This means that the larger the D / N, the greater the strength, which corresponds to the bending stress in the direction orthogonal to the x direction. In practice, if D / N> 0.15, D / L ≧ 0.5 A large maximum bending strength can be obtained. When this relationship is shown in the graph of FIG. 6, it can be said that the shaded curve portion is within the range of the suitable meandering ratio D / N and the meandering polymerization ratio D / L of the corrugated core body 11 of the present invention. .

For the above reasons, the corrugated core used in the present invention preferably has an amplitude rate H / L> 0.2, a meandering polymerization rate D / L ≧ 0.5,
By setting the meandering ratio D / N> 0.15, more preferably H / L> 0.
2, D / L ≧ 1.0, D / N> 0.15.

Next, the single-sided reinforced composite corrugated body (H / L = 0.5, D / L = 1.0, D / N = 0.3) according to the present invention obtained as described above is shown in FIG. Single-sided cardboard (H / L = 0.5)
Was compared with the strength.

Table 1 shows the in-plane compressive strength test results.

As is clear from Table 1, when comparing the composite corrugated body used in the present invention with the conventional single-sided cardboard,
The in-plane compressive strengths in the y direction are almost the same, but it is clear that in the x direction, the composite corrugated body has about 3 times the strength as compared with the conventional one.

Table 2 shows the results of the out-of-plane compressive strength test. From this table, the single-sided reinforced composite corrugated body used in the present invention has an out-of-plane compressive strength of about 1.7 times that of the conventional single-sided cardboard. It is clear.

Table 3 shows the test results of the out-of-plane bending strength in the plane direction perpendicular to the x direction in FIGS. 1 and 10, and from this table, the single-sided reinforced composite corrugated body according to the present invention is It is clear that it has an extremely high flexural strength of about 20 times that of cardboard.

As described above, it can be said that the single-sided reinforced composite corrugated body of the present invention is significantly superior to the conventional single-sided cardboard in various structural strength performances.

As described above, the wraparound case according to the present invention is obtained by cutting a single-sided reinforced composite corrugated body having many excellent properties into a predetermined shape and bending it.

FIG. 7 (A) shows a deployment sheet 15 for obtaining the wraparound case according to the first embodiment of the present invention. In this deployment sheet 15, corrugated rows are arranged along the longitudinal direction.
13 are arranged in a meandering shape, and a flat plate liner material 12 is adhered to one surface of the corrugated core body 11 so that the corrugated core body 11 is located on the inner surface of the box-formed case. The shape and ruled line position of this expansion sheet are the same as those of the expansion sheet when a conventional wraparound case is created. When this unfolding sheet is fed into the automatic box making machine, it is bent along the dotted line, and the flaps with the same signal are bonded to each other, and the flap VIII at the front end is attached to the inner surface of the rear end sheet III. Alternatively, the wraparound case 16 as shown in FIG. 7 (B) is obtained by adhering it to the outer surface.

FIG. 8 (A) shows a developing sheet 15a for obtaining the wraparound case according to the second embodiment of the present invention. In this unfolding sheet, the longitudinal direction of the corrugated row 13 extends in the lateral direction of the unfolding sheet 15a, and other configurations are the same as in the case of the first embodiment.

In the above-mentioned first and second embodiments, the flat plate liner material 12 is adhered so as to be located on the outer surface of the box-formed case, but this is taken into consideration in consideration of convenience when printing on the surface. Therefore, the flat plate liner material may be located on the inner surface if necessary.

Further, in the above-mentioned embodiment, only the case where the corrugated row extends along the longitudinal direction or the lateral direction of the expansion sheet has been described, but the corrugated row is inclined at an arbitrary angle with respect to the longitudinal direction of the expansion sheet. It may be formed or cut in the open state.

Next, FIG. 9 shows a wraparound case according to the first embodiment of the present invention (FIG. 7 (B)) and a conventional wraparound case (K180-SCP125) shown in FIG. 11 (B). Table 4 shows the out-of-plane compressive strength in the three directions obtained as a result of being subjected to the static load test from the three directions shown.

As is clear from this test result, when the product of the present invention and the conventional product were compared, although there was no great difference in the I-III direction, I
A significant improvement in the out-of-plane compressive strength was observed, which was 1.5 times in the I-IV direction and about 2 times in the V-VI direction. This is because the in-plane compressive strength in the II-IV direction on each wall surface of V and VI and the in-plane compressive strength in the V-VI direction on each wall surface of II and IV were significantly improved.

Incidentally, it is clear that the out-of-plane compressive strength of each surface, which is strongly required for the wraparound case, that is, the cushioning performance, is improved by about 1.7 times as compared with the conventional product as shown in Table 2 above. .

Further, in the above example, the case of the wraparound case using the single-sided reinforced composite corrugated body in which the flat plate liner is bonded to one surface of the corrugated core is explained, but the double-sided reinforced composite in which the flat plate liner is bonded to both sides of the corrugated core body is described. Even when a wraparound case is formed using a corrugated body, compared to the case where a wraparound case is formed using a conventional double-sided cardboard, the same relationship as the one-sided cardboard and the one-sided reinforced composite corrugated body in the above-mentioned implementation order It has an excellent effect due to its relative relationship.

The material of the reinforced composite corrugated body according to the present invention is paper or a paper-based material, which is a simple composite of various papers or a laminated composite of various papers and films made of various non-paper materials. , Or various processed papers coated with, impregnated with or adhering various cellulose or non-cellulosic materials, and various other materials, and those obtained by appropriately combining the above various materials are also effective in the present invention.

<Effect> As described above, the wraparound case according to the present invention forms corrugated rows by alternately providing peaks and valleys in the vertical direction, and corrugated cores formed by meandering the corrugated rows in a plane. Since the corrugated core itself has excellent in-plane compression strength, vertical out-of-plane compression strength, and out-of-plane bending strength, the manufactured wraparound case has large compression strength in the front and rear and left and right. However, the cushioning property of protecting the contents against external impact is excellent, and since the flap piece at the opening has a large bending strength, it is sufficiently protected against bending, bending, breakage and the like.

In particular, the single-sided reinforced composite corrugated body used in the present invention has an in-plane compressive strength in the x direction that is extremely larger than that of a conventional single-sided cardboard, and has a strength equal to or greater than the in-plane compressive strength in the y direction. A corrugated strip can be cut in any direction to obtain a spread sheet, and a wraparound case having sufficient strength in all the surface directions can be manufactured.

The fact that the corrugated striations can be cut in any direction means that a single-sided reinforced composite corrugated body is continuously manufactured with the maximum economical width, and the expansion sheet body is vertically and horizontally combined within the maximum width. Therefore, it is possible to cut so as to obtain the minimum scrap, and the width efficiency is improved, and as a result, high productivity can be obtained.

Moreover, since the core material that constitutes the conventional wraparound case is formed by forming the straight corrugated strips in parallel only in one direction (y direction), warp deformation easily occurs in the state of the deployable sheet, Although it tends to cause a failure in the automatic box making machine, in the case of the wraparound case of the present invention, corrugations are formed in the x direction and the y direction of the corrugated core body, and even in the state of the deployable type sheet. No warp deformation occurs and no shape distortion occurs in the case body after box making.

In addition, since the core material and the flat plate liner material that constitute the conventional wraparound case are bonded in a straight line in parallel, the bonding density is low, and the striped uneven surface is formed by the bonded portion and the non-bonded portion. It was easy to form and printability was poor. In contrast,
In the case of the wraparound case of the present invention, since the bonding between the corrugated core body and the flat sheet material is on a meandering parallel curve, the bonding density is increased and warp deformation is prevented, and the striped irregularities as described above are formed. It prevents the generation of the surface, maintains the flatness of each surface of the case, and greatly improves the precision printing suitability of the POS bar and the like.

In addition, in the present invention, when the corrugated core and the flat-sheet material are joined together and the sticking portion of the parallel closed valve liner material is on a meandering curve, when a ruled line is provided along the longitudinal direction of the corrugated row. In many cases, the ruled line passes through the bonding portion intermittently, so that the ruled line can be bent surely and precisely. In particular, when the meandering overlap ratio D / L ≧ 1, even if the ruled line is provided at an arbitrary position, the ruled line is always crossed at a plurality of positions, so that the ruled line is more precisely bent.

In the wraparound case of the present invention, there are a corrugated core body provided on the inner side surface and a corrugated core body provided on the outer side surface thereof. Especially, in the case of the former case, a reinforced corrugated sheet due to an impact from the outside of the case or the like. The damage to the case is prevented, and the printability on the outer surface of the case is excellent.On the other hand, in the case of the latter case, when multiple cases are stacked and transported or transferred by a forklift, etc. The serpentine corrugated rows on the outer surface mesh with each other, and x, y
Since it has a function to sufficiently suppress slipping in both directions, it is possible to prevent load collapse, and at the same time, when using a wraparound case that uses gravity to move on a smooth chute from above, An excellent bottom surface can be provided.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing the flat plate liner material of the composite corrugated body used in the present invention by partially breaking it, and FIG.
(F) is a cross-sectional shape of a corrugated strip that constitutes a composite corrugated body, showing the relationship between its wavelength and its wave height.
FIGS. 4 (A) to 4 (E) are diagrams showing the positional relationship between corrugated strips and the positional relationship between the corrugated strips and the flat liner material at different meandering polymerization rates of the corrugated strips constituting the composite corrugated body, FIG. Is a graph showing the relationship between the meandering polymerization rate, the amplitude rate, and the out-of-plane maximum bending strength index, FIG.
(F) is a diagram showing different meandering rates of corrugated strips constituting the composite corrugated body, FIG. 6 is a graph showing the relationship between the meandering polymerization rate, the amplitude rate, and the out-of-plane maximum bending strength index, FIG. 7 (A). ) And (B) are respectively a developed sheet diagram and a box-making diagram of the wraparound case according to the first embodiment of the present invention, and FIGS. 8 (A) and (B) are respectively the second embodiment of the present invention. FIG. 9 is a development sheet diagram and a box-making diagram of the wraparound case according to FIG. 9, and FIG. 9 is an explanatory view showing a direction of force when the wraparound case of the present invention is subjected to a static force test.
FIG. 10 is a partial perspective view of a conventional single-sided cardboard flat cardboard, partially broken away, and FIGS. 11A to 11C are a developed sheet diagram and a box-making diagram of a conventional wraparound case, respectively. 10 …… Composite corrugated body 11 …… Corrugated core body 12 …… Plate liner material 13 …… Corrugated strip 15 …… Deployment sheet 16 …… Wraparound case M …… Top, V …… Valley bottom

Continuation of front page (56) References JP-A-1-8031 (JP, A) JP 54-23035 (JP, B2)

Claims (2)

[Claims] 1. A sheet material is alternately provided with vertical ridges and troughs to form corrugated rows, and the corrugated rows are meandered in a flat corrugated shape so that cross-sectional waves of each corrugated row are formed. The amplitude ratio H / L (L: wavelength, H: amplitude) is 0.2 or more, and the meandering polymerization rate between the corrugated rows in a planar shape
Set the D / L (D: amplitude of plane meandering wave) to 0.5 or more, and further set the meandering ratio D / N (N: wavelength of plane meandering wave) of each corrugated row in a planar shape to 0.15 or more, Forming a reinforced composite corrugated body by adhering a flat plate liner to at least one surface of the corrugated core body, forming a wraparound case forming ruled line on the composite corrugated body, and applying the composite corrugated body along the ruled line A wraparound case characterized by being made in a box. 2. The wrap-around case according to claim 1, wherein the corrugated core body is placed inside to form a box.