JP2680668B2 - Assembled box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a prefabricated box formed by using a composite corrugated body constituted by adhering a flat plate liner material to a corrugated core body.

<< Prior Art >> As a conventional composite corrugated body 1, as shown in FIG. 17, a large number of corrugated rows 2 formed by alternately forming vertical peaks and troughs on a sheet material are arranged in a straight line on a plane. Thus, a corrugated core body 3 is formed, and a single-sided cardboard in which a flat plate liner 4 is bonded to one surface of the corrugated core body or a double-sided cardboard in which a flat plate liner is bonded to both surfaces of the corrugated core body is known.

When comparing the single-sided cardboard and the double-sided cardboard, the single-sided cardboard is far more advantageous in terms of cost, and thus it is conceivable to use the single-sided cardboard to form the preassembled box. And this one-sided cardboard 1
In order to manufacture a prefabricated box 7 having a structure in which a lid 6 is covered on a container 5 having an upper opening as shown in FIG. ) And (C), the corrugated row 2 is oriented in the short or longitudinal direction of the blanks and cut into a predetermined size as shown in the figure, and a ruled line is attached to the corrugated row 2 and supplied to an automatic box making machine. Box it.

<< Problems to be Solved by the Invention >> However, in the conventional single-sided cardboard, the x direction orthogonal to the corrugated row 2 in FIGS. 18 (B) and (C),
That is, the in-plane compressive strength of the cardboard in the cross grain direction becomes extremely low. Therefore, in order to maintain the strength of the entire assembly-type box 7, it is necessary to make the orientation directions of the container 5 and the lid 6 orthogonal to each other, and the cutting direction of the single-sided cardboard is limited.

Further, in the conventional single-sided cardboard, the out-of-plane bending strength in the vertical plane direction orthogonal to the x direction in FIG. 17 is also extremely low and it is easy to bend, so that the pre-assembled box shown in FIG. In addition, when wet, the bottom surface is likely to slip out.

Since the conventional single-sided cardboard has a low out-of-plane compressive strength as described above, sufficient cushioning properties cannot be obtained on each side of the box, and as a result, as a box for storing and carrying relatively heavy contents or relatively. It was completely unsuitable as a large assembly box.

Further, in the conventional single-sided cardboard 1, since the joint portion between the corrugated row 2 and the flat plate liner 4 becomes a parallel line shape along the mountain portion of the corrugated row 2, the ruled lined portion of this single-sided cardboard (box making If the bent portion at the time) matches the parallel line portion, it is easy to bend along that portion, but if the other ruled line parts deviate from the parallel line portion, it follows the ruled line. It was difficult to make an accurate turn.

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 box 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.

In addition, the conventional single-sided cardboard is apt to warp and deform, and the striped groove is formed on the flat liner surface, resulting in poor printability,
In particular, it was unsuitable for precision printing such as POS bars.

Further, as is clear from FIGS. 18 (B) and (C),
The unfolded sheet of single-sided corrugated cardboard for forming the prefabricated box must be cut so that the corrugated row direction is the specified direction. A problem was pointed out that the efficiency would decrease.

The present invention has been made in view of the above problems, and an object thereof 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 the corrugated row of It is possible to cut and make boxes in any direction of the corrugated row without being constrained in the arrangement direction, yet it is difficult for the body to bulge and the bottom to come off, and the scoring part (folded part)
It is an object of the present invention to provide a prefabricated box which can obtain the accurate dimensional accuracy, is excellent in printability, and can improve the cutting efficiency.

<< Means for Solving the Problem >> In order to achieve the above object, in the prefabricated box according to the present invention, a corrugated row is provided in a horizontal direction by alternately applying vertical peaks and troughs to the sheet material. Formed in a smooth meandering waveform and the actual amplitude ratio H / L in the corrugated row.
Is 0.4 or more and 1.4 or less, the substantial meandering ratio D / N is 0.35 or less, the substantial meandering polymerization rate D / L is 0.5 or more, and the squeezing ratio i in the traveling direction of the corrugated row is 8% + the stretching strain ratio of the sheet material. Below,
Further, a corrugated core is formed by making the top and bottom of the corrugated row into a curved shape or a chamfered shape with a narrow width or a shoulder drop shape, and a flat liner is adhered to at least one surface of the corrugated core body to form a composite corrugated body. The composite corrugated body is formed with a relatively large rectangular section at the center in the developed view, and flap pieces that serve as side wall portions are arranged on each side of the rectangular section, and the flap sections are adjacent to each other. A margin is formed on at least one of the side edges to be bent, the flap piece is bent at approximately 90 ° with respect to the rectangular section, and the margin is adhered to an adjacent flap piece to form a box and a container and a lid. Forming a body and covering the container with the lid.

<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 prefabricated box according to the present invention, which is a corrugated core body.
It is composed of 11 and a flat liner 12. In this corrugated core body 11, a corrugated strip row 13 formed by alternately providing vertical ridges M and valleys V in the x direction is made to meander in a wavy shape in the y direction in a plan view, and these corrugated strips are formed. The columns are parallel to each other. The flat plate liner 12 is integrally bonded to the corrugated row 13 at the peaks M and the valleys V of the corrugated row 13.

Further, the corrugated row of the corrugated core body 11 described above.
The shape of 13 is determined in consideration of easiness of manufacturing because it has a desired strength and needs to be put into practical use. And
First, in order to have a predetermined strength, the substantial amplitude rate H / L, the substantial meandering polymerization rate D / L, and the substantial meandering rate D / N are set to the following numerical values.

Here, the substantial 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 at the vertical plane in the x direction in FIG. 1, and more specifically, the above. It is determined as follows. That is, in the cross-sectional waveform of the corrugated row 13 shown in FIG. 2, the substantial amplitude H of the substantial cross-sectional waveform 15 obtained by linearly extending the slope of each swash wall portion in both the upper and lower directions is determined and the period L of the cross-sectional waveform is compared with the period L. It is the ratio of the substantial amplitude H.

The actual meandering ratio D / N indicates the relationship between the amplitude D and the wavelength N when the corrugated strips are viewed in plan. Specifically, the actual meandering ratio D / N is as follows. Determined.
That is, in the plane waveform of the corrugated row 13 of FIG. 3, that is, in the meandering shape 16, the slope of the meandering shape 16 around each neutral axis is increased,
Reference meander type 17 obtained by linearly extending in both lower directions
And the reference amplitude D ′ of the meandering form 17 and the amplitude D of the meandering form, the substantial meandering D of the substantially meandering form 18 is D = D ₀ + (D′−D ₀ ) ×
k, where k is defined as 0.3, and is the ratio of the substantial amplitude D to the meandering period N.

Further, as shown in FIG. 1, the substantial meandering polymerization rate D / L shows the relationship between the amplitude D of each corrugated strip and the wavelength L of the above-mentioned sectional wave when the corrugated strip is viewed in plan. ing.

<Substantial Amplitude> The slope gradient α of the sloping wall portion 20 of the corrugated row 13 with respect to the flat plate liner 12, that is, the actual amplitude rate H / L in the sectional waveform of the same row is taken as a variable, and x-
The variation value of the shear stress Gx in the in-plane x direction (see FIG. 4) was confirmed experimentally, and the result was graphed as a shape-shear strength curve group in FIG. Here, the functional formula of the curve group is Gx ＝ g _j
It is expressed as (L / H), Gx is the maximum shear stress index in the x direction, and g is a function symbol. Also, j is a parameter,
Specifically, it is the substantial meandering ratio D / N in the plane waveform of the corrugated row 13.

As is clear from the figure, each curve has a substantially meandering rate j of 0.
When the value is increased from 0.5 to 0.5, it shifts upward in a parallel movement at first glance, and the distance between them is gradually reduced, but the most characteristic one is that each curve has an inclination angle α = 10 ° (L / L From H ≈ 0.1) to α = 40 ° (L / H ≈ 0.4), it rises relatively steeply and exceeds Gx = 1.0, then α = 45 ° (L / H =
0.5) The slope became slightly gentle around the corner, and finally θ ≈ 5
It reaches the summit near 5 ° (L / H = 0.7), but then θ ≒ 70
A relatively steep descent near ゜ (L / H = 0.4), θ ≒ 70
It means that after ゜, the gradient becomes a little gentle and reaches α ≒ 90 ゜. That is, the characteristic of each curve is α ≈ 55 ° (L / H =
0.7) This is the point where a common peak effect appears in the vicinity.

In other words, judging from the above facts, the proper inclination angle α at which the predetermined shear strength Gx practically used is obtained is 40 ° ≦ α ≦ 70 ° centered on 55 °, and the actual amplitude ratio H / If it is replaced with L, it becomes possible to approximately limit 0.4 ≦ H / L ≦ 1.4 as an appropriate real amplitude ratio (hatched part in the figure).

Gx = 1.0 is j = 0, that is, the maximum shear stress in the x direction at the peak of the current corrugated cardboard-like composite corrugated body.

<Substantially meandering polymerization rate> In order to make the structural strength of the reinforced composite corrugated body practical, in addition to the above-mentioned shear stress (strength), there is an out-of-plane bending rigidity in the direction orthogonal to the corrugated rows. That is, as shown in FIG. 6, it is the maximum bending stress in the xy in-plane x direction.

Here, the period L in the cross-sectional waveform of the corrugated row 13
The ratio of the amplitude D in the plane waveform to, that is, the substantial meandering polymerization rate D / L is taken as a variable, and the variation value of the maximum bending stress (index) with respect to the change of the variable is experimentally confirmed, and the result is shown in FIG. Shape-shown as a group of bending strength lines.

The functional formula of the curve group is expressed as Mx = h _j (D / L), Mx is the maximum bending stress index in the x direction, and h is a function symbol. In addition, j is a parameter, specifically, the actual meandering rate D / N.

As is clear from the figure, each curve has a substantial meandering rate j.
When the value increases from 0 to 0.15, it shifts upward with a slight change in the slope, and the intervals between the curves are gradually reduced, but the most characteristic is that each curve has a substantially meandering polymerization rate D. There is a gentle slope from 0 to 0.5 of / L, but once D /
As L passes 0.5, it rises steeply, and then D /
When L exceeds 1.0, it means that the slope is steeper and continues to rise. That is, each curve has a specific D / L value that causes the above two bending points, and that value is j. It is common to each curve that is different.

In addition, Mx = 1.0 is a bending stress found in the existing corrugated cardboard-like composite corrugated body with j = 0.

As described above, it was clarified that the shape-bending strength curve Mx = h _j (D / L) has two bending points when the substantial meandering polymerization rate D / L is 0.5 and 1.0. Observing the changes in the relative positions of the corrugated row plane meandering shapes, first, when D / L <0.5, the bottom of the corrugated row meandering shape The top of the corrugated row where each bend on the central axis of the corrugated row is adjacent It is located in front of the y-direction line obtained by connecting the bent parts on the central axis of the meandering valley (Fig. 8 (A)), and when D / L = 0.5, the bent parts of the corrugated row are adjacent. Located beyond the y-direction line of the corrugated row (Fig. 8 (B)), and D /
When L = 1.0, each bent portion on the central axis of the top meandering corrugated row moves to the y-direction line of the adjacent corrugated row (Fig. 8 (C)), and D / L> 1.0. Then, the bent portion of the corrugated row is located further beyond the y-direction line of the adjacent corrugated row (FIG. 8 (D)).

Furthermore, observing the change in the positional relationship of the plane corrugated shape of the corrugated row with the value of D / L above, when observing the cross-sectional shape of the reinforced composite corrugated body along the line in the y direction, the morphology of the truss-like structure of the reinforced composite corrugated body is observed. Features and their x
The change in the out-of-plane bending strength Mx in the direction becomes more apparent. That is, first, in the cross-sectional shape of the reinforced composite corrugated body, D /
When L <0.5, the reinforced corrugated body is a single-sided flat liner
Since it is joined only to 12, its truss-like structure is rather unstable, so the bending strength Mx is extremely small. When D / L = 0.5, the reinforced corrugated body is joined to the flat liners on both upper and lower surfaces, so that its truss-like structure can be drastically changed in its morphological characteristics compared to the above truss-like structure. As D / L> 0.5 and the value gradually increases, the inclination angle of the web of the truss-like structure becomes steep, so the strength Mx increases at a higher rate than when D / L <0.5. . Furthermore, when D / L = 1.0, the reinforced corrugated body has a bonding density of D / L = 0.5 with the flat liners on both upper and lower surfaces.
Since the truss-like structure is doubled in comparison with that of the above-mentioned, the truss-like structure is abruptly changed in its morphological characteristics to a more stable one as compared with the above-mentioned truss-like structure, and the truss is increased in accordance with D / L> 1.0. Since the angle of inclination of the web with a similar structure becomes steeper and the vertical height of the triangle composed of the web and the flat plate liner joined only to the single-sided flat liner becomes large, the strength Mx is further increased from the case of D / L <1.0. Increase with a high rate.

As described above, it is clear that the shape-bending strength curve formula Mx = h _j (D / L) has two singular points that rapidly increase the bending strength Mx at D / L = 0.5 and D / L = 1.0. However, in order to secure a bending strength Mx suitable for practical use of the reinforced composite corrugated body of the present invention, the substantial meandering polymerization rate D / L is D / L ≧ 0.
5 and the range is shown as the shaded and meshed portions in FIG. 7, and more preferably D / L is D / L
It is set to ≧ 1.0, and the range is shown in the part of the mesh line in the figure.

<Other requirements> In order to obtain the desired strength in the corrugated row, in addition to the various conditions described above, the following conditions must be satisfied.

That is, the various structural strengths of the reinforced composite corrugated body according to the present invention are first obtained by joining and integrating the reinforced corrugated body and the flat plate liner, and in particular, the x-direction shear strength and the x-direction bending strength are It greatly depends on the joint area between the reinforced corrugated body and the flat plate liner, and is proportional to the joint area if the jointing method and the adhesive are the same.

Therefore, the contact area should be relatively large. Specifically, as shown in FIG. 9, a reinforced corrugated body should be formed so that the cross-sectional shape of the top and bottom of the corrugated row is made as large as possible the bending width w of the top and bottom. Is.

Next, in order to manufacture a reinforced corrugated body that is easy to manufacture, the corrugated row must meet the following requirements.

<First requirement (width reduction ratio)> Here, the width reduction ratio refers to the contraction ratio of the width of the flat sheet before the formation of the corrugated rows to the width of the flat sheet after the formation.

First, the manufacturing process of the reinforced corrugated body will be described. As shown in FIG. 10, a pair of forming rollers formed by arranging tooth profile rows 22 that substantially match the corrugated rows to be manufactured in multiple stages in the circumferential direction of the circumferential surface. A corrugated sheet 24 having a predetermined width is inserted between 23. Then, a corrugated row having a desired shape is manufactured by performing pressure molding between both forming rollers 23 (roll forming method). The width-shifting (preliminary width-shifting rate i ₀ ) applied to the corrugated sheet 24 is substantially the same as the final width-shifting rate i (strictly speaking, the sheet itself shrinks at the time of processing. It becomes ₀ ).

If the width-shifting ratio i (preliminary width-shifting ratio i ₀ ) is increased beyond a certain limit, excessive wrinkles and breaks in the x direction frequently occur. This is because the cross-sectional waveform H / L of the corrugated core body 11 becomes excessively large, and locally causes an irregular buckling deformation in the cross-sectional waveform that is pressed immediately after being supplied between the forming rollers 23, and falls. This is because it is possible to cause tightness and the like, and at the same time, the distribution of the width-shifting ratio i which is uniform in the width direction is significantly hindered.

More specifically, referring to the graph of FIG. 11 showing the correlation between the amount of occurrence of collapse and the advance width-shifting ratio i ₀ , the limit of the predetermined width-shifting ratio i will be described. In the first place, the corrugated core body 11 obtained by roll forming will be described. The predetermined width-shifting ratio i obtained is given by i> i ₀ + β. Here, β is the width-direction limit stretching strain rate of the corrugated processed sheet 24, and when it exceeds the limit, the material strength is significantly deteriorated (the strength is reduced by 30% for the time being), so that it is put to practical use. This is the limit value at which it disappears. For paper sheets, steel sheet sheets, and semi-rigid plastic sheets with a low stretching limit, 2.0% is the upper limit of the stretching strain rate β, and for aluminum sheets and plastic sheets, the stretching limit is slightly high, so 5.0% is the ultimate stretching limit. The distortion rate is β.

It should be noted that, i ₀ the frequency index is pre-side-to-side rate i ₀ of collapse in the figure
The fall frequency is 1.0 when == 5.0%.

As is clear from the figure, the value of the collapse frequency increases with a change in the preliminary advancing ratio i ₀ , but the increase becomes abrupt at about i ₀ = 8.0%. Therefore, in order to suppress the occurrence of collapse of the sheet to be processed 01 as low as possible, it is necessary to set the advance width adjustment ratio i ₀ within the range of 0 <i ₀ ≦ 8.0% (hatched portion in the figure).

Therefore, in order for the final corrugated core body 11 to be processed and formed by the stable and high-speed roll forming method, 0 <i ≦ 8 + β is set. Specifically, the stretching deformation ratio β of the sheet to be processed is set. When 0 ≦ β ≦ 2.0%, the value is set in the range of 0 <i ≦ 10.0%.

<Second requirement> Since it is necessary to have a predetermined strength as described above, the corrugated row has a predetermined bending width w at the top and bottom thereof. However, since this condition is satisfied, for example, as shown in FIG. As described above, when the corrugated row 13 'has a substantially trapezoidal cross section in which the tops and bottoms MV are flat, in the roll forming,
Microscopically when processed and formed, the trapezoidal flat surfaces at the top and bottom of the corrugated row are inevitably subjected to in-plane curved deformation mainly at the bends near the peak and valley central axes l1 and l2.
Since the trapezoidal surface is flat, it is stretched and deformed by pulling at the outside of the trapezoidal surface of the trapezoidal surface (the shaded area in the figure) around the bend, causing significant strain deformation or breakage damage. Therefore, it cannot be put to practical use.

In order to solve such a problem, various cross-sectional shapes of the top / bottom portion M / V are set as shown in FIGS. 9 (A) to 9 (D). That is, in the cross-sectional shape of each top / bottom MV, do flat surfaces be eliminated at all (A-1, A-2, A-4, B-1, B in the same figure)?
-3, C, D) Formed so as to leave a very limited number of flat surfaces (A-3, B-2 in the same figure).

The former connection is accompanied by a predetermined widthwise shift in the y direction, and mainly by facilitating in-plane bending deformation of the bent portion, the occurrence of residual strain stress such as strain deformation is suppressed as much as possible, resulting in fracture damage, etc. It has become possible to completely prevent the occurrence of.

In the latter case, the flat surface remaining in the top / bottom cross-section is very small, that is, it becomes a narrow flat strip surface, so that the in-plane bending deformation of the bent portion due to the predetermined widthwise shifting in the y direction causes local deformation. The amount of in-plane stretching strain is so small that the residual strain stress is almost negligible if no fracture damage occurs.

<Third requirement> Further, in the present invention, the plane meandering shape of the corrugated row 13 is a meandering shape having a smooth plane wave shape. Specifically, the corrugated row 13 may have a continuous curved shape over its entire length (see
13 (A)), the bent portion is formed into a curved linear shape and connected by the straight lines ((B) in the same figure), or the bent portion is formed into a linear shape and connected by a curved line ((C) in the same figure), A trapezoid is formed by connecting straight lines to the entire length and its corners are chamfered ((D) in the figure), or a trapezoid is formed by connecting straight lines to the entire length, and the internal angle θ of the opposite hypotenuse is set to 120 ° or more. It may be flat (Fig. (E)), or may have a relatively flat zigzag shape with an internal angle θ of 120 ° or more (Fig. (F)), and the bent portions may be curved line segments that are wavy with a relatively small period. They are connected by a curve ((G) and (H) in the same figure).

As described above, by forming the corrugated strip meandering shape according to the present invention as a smooth flat corrugation, it was possible to remove various acute-angled projections in the corrugation. Since the row 22 has a serpentine shape having a smooth plane wave shape, the corrugated work sheet 24 is dispersed and pressed by the toothed row 22 in a relatively wide range during roll forming. As a result, local strain deformation is avoided, and at the same time, the sheet to be processed is not hindered from sliding on the tooth profile due to stepping in the x direction.
It is possible to prevent tensile strain deformation in the direction and occurrence of breakage due to the deformation.

Furthermore, since the sliding of the corrugated sheet to be processed 24 on the tooth-shaped row 22 due to the fine adjustment of the widthwise adjustment in the y direction is not hindered at all, the tensile strain deformation in the y direction and the occurrence of breakage due to it are sufficiently suppressed. As a result, the roll forming of the reinforced corrugated body of the present invention is performed stably and at high speed.

<Regarding Overall Shape Condition> The suitable shape condition of the corrugated row is first achieved by satisfying both the requirements in terms of strength and manufacturing as described above, and specifically, the following conditions are obtained.

That is, the shape curve group shown in the graph of FIG. 14 is expressed as H / L = f _i (D / N). It should be noted that the curve formula has no relation to the substantially meandering polymerization rate D / L and the bending width w.

The above shape curve formula is established regardless of the absolute values of the individual shape values H, L, D and N. That is, it is a theoretical functional relationship that is formed by a shape ratio and that describes only the shape characteristics of the corrugated core body 11, and is unrelated to the structural strength and workability of the corrugated core body.

More specifically, there is only one combination H / L, D / N of variable values that satisfies the above-mentioned shape curve formula for one fixed value of the parameter variable constant i, for example, the value of the variable constant i and the value of the variable H / L. Combination uniquely determines the value of the variable D / N or the variable constant i
Of the variable and the value of the variable D / N determines the variable H / L or
The combination of H / L and D / N values determines the value of the constant i.

The shape curve group in the figure is drawn as a similarity hyperbola group obtained by parallel movement, and the width shift ratio i is 5% ≦ i ≦
Only the shape curve with 20% is illustrated, and i <5% around it
And i> 20% shape curves are omitted.

In addition, the shape curve group is the shape of each part, that is, the substantial amplitude, which is formed by processing the actual corrugated body having various substantial meandering ratios D / N at the substantial amplitude ratio H / L = 0 by varying the width-shifting ratio i. It can be plotted by measuring changes in the rate H / L and the actual meandering rate D / N. Of both shape conditions related to structural strength and workability, the optimum range that simultaneously satisfies the real amplitude ratio and the width-shifting ratio, which are the most important factors for enabling practical application, is the appropriate real amplitude ratio H / L is H / L. = 0.7 is the optimum value, and the optimum range is limited to 0.4 ≤ H / L ≤ 1.4. On the other hand, the shape curve with the appropriate width adjustment ratio i is 0 <H / L ≤ 10% (D / N)
The actual meandering rate D / N is limited and suitable for
Is limited to the optimum range of 0 <D / N ≦ 0.35, and the shaded area in the graph of FIG. 14 indicates the optimum range.

Using this graph showing the optimum range of the shape of the shape curve group, the shape design of the corrugated row of the reinforced corrugated body and the shape design of the tooth profile row of the forming roller according to the present invention are efficiently performed. For example, by setting the appropriate H / L, i in advance, a method of determining and designing the D / N that enables a reinforced corrugated body with high structural strength and excellent workability, and the appropriateness in advance. Become H
To the automatic control system of the pre-corrugation roller (the device that processes a flat sheet into the corrugated sheet 24) that sets / L and D / N and calculates and controls the i value that enables it. It is useful for applications.

The shape curve is established regardless of the type of material of the sheet to be processed.

* Experimental results Introducing three characteristic cases out of many examples. First, in the first case, the corrugated row shape is a real amplitude rate H / L = 0.7, a real meandering rate D using a paper sheet.
/N=0.18, substantial meandering polymerization rate D / L = 1.0, width-shifting rate i = 5%, and a flat corrugation is formed as a smooth wave shape consisting of continuous curves, and the cross-sectional shape of the top and bottom of the row is formed as a curved shape. The reinforced corrugated body thus obtained was roll-formed by a predetermined heating type forming roller without any processing trouble at a speed of about 150 m / min.

In addition, since the advance width-shifting ratio was 5% and the stretching strain ratio β ≈ 0 during the roll forming, the reinforced corrugated body was an ideal fold characterized by being practically deployable topologically. Obtained as a plate structure.

Further, the reinforced composite corrugated body obtained by integrally laminating the reinforced corrugated body on both sides thereof with the biplane board sheet has the same sheet material row amplitude H ₀ , the same period L and the same bending width w. The amount of the sheet used increased by about 2% as compared with the known corrugated board, but the maximum shear strength in the x direction was 50%.
%, The result that the bending strength in the x direction exceeds 60% was confirmed.

Next, using a paper sheet as the second case, the real amplitude ratio H / L = 0.7 of the corrugated row, the real meandering polymerization ratio D / L = 1.0, the real meandering ratio D / N = 0.24, and the width shift ratio i = 8. %, And the reinforced corrugated body, in which the serpentine type has a smooth plane wave shape in a continuous curve and the cross-sectional shape of the top and bottom of the row is curved, no machining trouble occurs at a speed of 100 m / min. It was obtained by being roll-formed by the heating type forming roller. During roll forming, it was processed with a pre-alignment ratio of 6.5% and a sheet stretching strain ratio of β ≈ 1.5%, so it is difficult to develop topologically a little, and the strength of the material in the width direction of the processed sheet is somewhat It can be said that it has deteriorated. Further, the reinforced composite corrugated body obtained by integrally laminating the reinforced corrugated body on both sides thereof with the biplane board sheet was compared under the same conditions as those of known corrugated board, and the amount of the sheet to be processed used was 3
%, But it was confirmed that the maximum shear strength in the x direction was about 55%, and the bending strength in the x direction was about 75%.

In the third case, a sheet of flat paper is integrally attached to one side of a reinforced corrugated body made of a paper sheet having the same shape as the reinforced corrugated body of the first case, which is processed and formed by the roll forming method. The obtained single-sided reinforced corrugated body is compared with a known single-sided corrugated board under the same sheet material, row amplitude H ₀ , same period L, same bending width w, etc. Was increased by about 3%, but the remarkable result that the bending strength in the x direction exceeds by about 220% was confirmed.

As seen in the first and second cases, the increase in product cost is 10% or less compared to the known corrugated board (however, the material increase is 4% or less, and the manufacturing cost increase is 6% or less due to the decrease in roll forming speed). The product value = 50% or more and the difference in structural strength is 50% or more.
Strength / Cost ≧ 150/110 = 1.36, and other performances are considered to be equivalent, so a product value gap of about 40% or more is clarified. In the third case, the increase in product cost is 7%.
% (However, increase in material is 3% or less, increase in manufacturing cost is 4%) and the difference in bending strength is 220%, so product value = strength / cost ≥ 320/107 = 2.99, and other performance is the same. Therefore, the product value gap of about 200% or more was revealed.

Next, the single-sided reinforced composite corrugated body according to the present invention (H / L = 0.5, D / L = 1.1, D / N = 0.32) obtained as described above.
The conventional single-sided cardboard (H / L =
0.5) and the strength were compared.

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

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

Table 2 shows the test results of the out-of-plane compressive strength,
From this table, it is clear that the single-sided reinforced composite corrugated body used in the present invention has an out-of-plane compressive strength that is slightly less than twice that of the conventional single-sided cardboard.

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 17, 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 bending strength, about 22 times that of cardboard.

As described above, it can be said that the single-sided 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 single-sided reinforced composite corrugated body having many excellent properties is cut into a predetermined shape and bent to obtain the prefabricated box according to the present invention.

FIG. 15 (A) shows a development sheet 26 for only obtaining the container 25 that constitutes the prefabricated box according to the first embodiment of the present invention.
In this unfolding sheet 26, the corrugated rows 13 are arranged in a meandering shape along the lateral direction, and the corrugated core body 11 is located on one side of the corrugated core body 11 so that the corrugated core body 11 is located on the inner surface of the box. A flat plate liner material 12 is adhered.

Further, in this unfolding sheet 26, a relatively large rectangular section I that serves as a bottom portion at the time of box making is provided in the central portion,
The long side of the rectangular section I has a narrow first flap piece II, II.
Has been arranged. The first flap pieces II, II are adapted to be bent at 90 ° with respect to the rectangular section I at the time of box making to form a side wall portion. Also, this first flap piece II, II
A margin 27 is provided on each side edge of the.

On the other hand, the short side of the rectangular section I has a first flap side II.
And a second flap piece III having substantially the same width as the above. Like the first flap piece II, the second flap pieces III, III are bent 90 ° with respect to the rectangular section I to form a side wall portion. And this development sheet 26,2
When 6'is fed into the automatic box making machine, it is bent along the boundary line between the flap pieces, and the glue margin 27 is the second flap piece II.
Prefabricated box 28, as shown in FIG. 15 (B), bonded to I
A container 25 forming a part of is obtained.

The lid 29, which is covered with the container 25, is formed of a development sheet 26 'shown in FIG. 15 (C). The developing sheet 26 'is basically the same as the developing sheet 26 for the container 25. Explaining only the difference, the glue margin 27' is provided on the side of the second flap piece III 'and the rectangular section I is used. This is that the shape of ′ is slightly larger than the rectangular section I of the container 25. Although the height of the lid 29 and the height of the container 25 are substantially the same in this example, this is not always necessary in the present invention.

FIG. 16 shows a prefabricated box according to the second embodiment of the present invention.

In this embodiment, differently from the first embodiment, the corrugated strips 13 are oriented in the longitudinal direction of the blanks in the developing sheet for the lid 29a as shown in FIG. The orientation of the corrugated rows 13 in the box formed by this is such that the container 25 and the lid 29 are orthogonal to each other.

The rest of the configuration is similar to that of the first embodiment.

In addition, in the 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, but this is taken into consideration for convenience when printing on the surface. However, the flat plate liner material may be positioned on the inner surface if necessary.

Further, in the above-described 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 left state.

Next, the prefabricated box (K1) shown in FIG. 18A and the prefabricated box according to the first embodiment of the present invention.
80-SCP120) was subjected to a compressive strength test in the vertical direction (II 'direction), the lateral direction (II-II direction), and the front-back direction (III-III direction), and the results are shown in Table 4.

As is clear from the test results, when the product of the present invention and the conventional product are compared, the strength is improved in all directions.

The material of the single-sided 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-based substances. There are various other materials such as processed papers coated with, impregnated with or adhered to the body or various cellulose or non-cellulosic materials, and combinations of the above various materials are also effective in the present invention.

Further, in the above embodiment, the case of the assembling type box using the single-sided reinforced composite corrugated body in which the flat plate liner is bonded to one side of the corrugated core is explained, but the double-sided reinforced composite in which the flat plate liner is bonded to both sides of this corrugated core is described. Even when the corrugated body is used to form the prefabricated box, compared to the case where the conventional double-sided cardboard is used to form the prefabricated box, the relationship between the single-sided cardboard and the single-sided reinforced composite corrugated body in the above-described embodiment is the same. It has an excellent effect due to its relative relationship.

<Effects> As described above, the assembling type box according to the present invention forms corrugated rows by alternately providing peaks and troughs in the vertical direction, and corrugates formed by meandering the corrugated rows in a plane. Since the core is used, the prefabricated assembly box produced with the excellent in-plane compressive strength, vertical out-of-plane compressive strength, and out-of-plane bending strength of this corrugated core itself has a large compressive strength in the front-rear and left-right directions. Since the flap piece at the opening has a great bending strength, it is sufficiently protected against 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 development sheet, and a prefabricated box having sufficient strength in all 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.

In addition, since the core material that constitutes the conventional assembling type box has only straight corrugated strips formed in parallel in only one direction (y direction), it is easy to cause warp deformation in the state of the deployable sheet, Although it is easy to cause a failure in the box making machine, in the case of the assembling type box of the present invention, the corrugated core body has corrugations in the x and y directions, and is completely warped and deformed even in the state of the deployable sheet. Does not occur, and no shape distortion occurs in the box body after box making.

Moreover, since the core material and the flat plate liner material that constitute the conventional assembling type box are bonded in a straight line in parallel, the bonding density is low, and the striped uneven surface is formed by the bonding part and the non-bonding part. It was easy to form and printability was poor. On the other hand, in the case of the assembly-type box 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 It prevents the occurrence of such a striped uneven surface, maintains the flatness of each surface of the box, and greatly improves the precision printing suitability of POS bars and the like.

Further, in the present invention, since the bonding portion between the corrugated core body and the flat plate liner material is on a meandering curve, when a bent portion along the longitudinal direction of the corrugated row is provided, this portion is often Because it passes through the bonding section intermittently,
The ruled line can be bent surely and precisely. Especially,
When the meandering overlap ratio D / L ≧ 1, even if the ruled line is provided at an arbitrary position, it always intersects with the corrugated row at a plurality of positions, so that the bending becomes more precise.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a flat plate liner material of a composite corrugated body used in the present invention by partially breaking it, and FIG. 2 is a view showing a cross-sectional shape in the x direction of a corrugated row of the composite corrugated body according to the present invention, FIG. 3 (A) is a plan view showing the composite corrugated body of the present invention and its shape characteristic, FIG. 3 (B) is a plan waveform diagram showing the corrugated row meandering ridge line portion, and FIG. 4 is the present invention. FIG. 5 schematically shows the direction of shear stress in the composite corrugated body of FIG.
A graph of the shape-shear strength curve showing the maximum shear stress index in the in-plane x direction and the slope θ of the row slope wall or the actual amplitude ratio H / L correlation of the row. Fig. 6 shows the bending stress of the composite corrugated body. FIG. 7 schematically shows the directions, and FIG. 7 shows the correlation between the maximum bending stress index in the y-x out-of-plane x direction and the substantial meandering polymerization rate D / L and the substantial meandering rate D / N of the row in the composite corrugated body. Shape-bending strength curve graph, FIG. 8 is a diagram 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. 9 is a waveform diagram of each cross section of the corrugated row of the composite corrugated body in the x direction,
FIG. 10 is a cutaway perspective view schematically showing a roll forming method used for forming a reinforced corrugated body, and FIG. 11 shows a collapse occurrence frequency index of a corrugated work sheet during roll forming of a composite corrugated body. Fig. 12 shows the relationship with the advance width-shifting ratio.
Showing an example of a corrugated row satisfying the requirements of FIG. 13, FIG. 13 is various plane waveform diagrams showing a meandering waveform of the corrugated row of the composite corrugated body, and FIG. 14 is a substance of the corrugated row in the composite corrugated body according to the present invention. Amplitude rate H / L and actual meandering rate D
/ N and a graph of a shape curve showing the correlation between the y-direction width shift ratio i, FIG. 15 is a diagram showing a first embodiment of the present invention, FIG. 16 is a diagram showing a second embodiment, and FIG. 18 is a partial perspective view of a conventional single-sided cardboard flat cardboard paper, partially broken away, FIG.
Drawings (A)-(C) are a deployment sheet figure and a box-making figure of the conventional assembly type box, respectively. 10 …… Composite corrugated body 11 …… Corrugated core body 12 …… Flat liner material 13 …… Corrugated row 25 …… Container 26,26 ′ …… Development sheet 27 …… Glue margin 28 …… Assembled box 29 …… Lid M ... top, V ... valley bottom

Claims (1)

(57) [Claims] 1. A sheet material is alternately provided with vertical peaks and troughs to form a corrugated row in a smooth and meandering waveform in the horizontal direction, and a substantial amplitude ratio H / L in the corrugated row is obtained. 0.4 or more and 1.4 or less, the actual meandering ratio D / N is 0.35 or less,
The substantial meandering polymerization rate D / L is 0.5 or more, the width-shifting rate i in the traveling direction of the corrugated row is 8% + the stretching strain rate of the sheet material, and the cross-sectional shape of the top and bottom of the corrugated row. To form a corrugated core having a curved shape or a chamfered shape with a narrow width or a shoulder drop shape, and bonding a flat plate liner to at least one surface of the corrugated core to form a composite corrugated body. , A relatively large rectangular section is provided in the center, and a flap piece that will be a side wall portion is arranged on each side of the rectangular section, and a glue margin is formed on at least one of the adjacent side edges between the flap pieces. Forming a container and a lid by bending the flap piece with respect to the rectangular section at about 90 ° and adhering the glue margin to the adjacent flap piece to form a box, and Cover the lid Prefabricated box, characterized in that it consists.