JPH02242734A - Assembly type box - Google Patents

Abstract

PURPOSE:To increase a buffer ability and prevent bending, curving and breaking of a box, by making peaks and troughs alternately in the vertical direction to form a required corrugated rows and by using a corrugated core body with the corrugated rows meandering on a plane. CONSTITUTION:A corrugated core body 11 is formed in such a maner that an actual amplitude rate H/L of corrugate rows 13 is within 0.4-1.4, an actual meandering rate D/N is less than 0.35, an actual superposed ratio of meander D/L is more than 0.5 and a width-shifting ratio in the travelling direction of the corrugate rows is less than 8% plus a deflection ratio of the sheet materials and further the cross section of the peaks and troughs of the corrugate rows is formed to shape curved or beveled with a narrow width or shoulder-cut to define the corrugate core body 11. Moreover, a flat plate liner 12 is stuck to at least one face of the corrugate core body 11 to form a complex corrugated member 10 and a ruled line is drawn to partition four rectangular parts continuing laterally in the developed drawing in the complex corru gate core body 10. And further, an upper flap and lower flap, which can be folded independently, are fitted at the both upper and lower parts of the upper and lower ruled lines of respective rectangular partitions. In this way, bending, curving and breaking can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a prefabricated case made of a composite corrugated body formed by bonding a flat liner material to a corrugated core body.

(Prior Art) As shown in FIG. 17, a conventional composite corrugated body 1 includes a large number of corrugated rows 2 formed by alternating vertical peaks and troughs on a sheet material arranged in a straight plane. A single-sided corrugated board in which a corrugated core 3 is formed and a flat liner 4 is adhered to one side of the corrugated core, or a double-sided corrugated board in which flat liners are adhered to both sides of the corrugated core is known.

When comparing single-sided cardboard and double-sided cardboard, single-sided cardboard is more advantageous in heat insulation in terms of cost, so it is conceivable to create an assembly type case using single-sided cardboard.

Then, using this single-sided cardboard 1, as shown in FIG.
As shown in FIG.
As shown in Figure (B), the corrugated rows 2 are oriented in the lateral direction of the blank, cut into predetermined dimensions as shown in the figure, provided with ruled lines, and fed to an automatic box making machine to form boxes.

(Problem to be solved by the invention) However, in the conventional single-sided cardboard, as shown in Fig. 18 (
The in-plane compressive strength in the X direction perpendicular to the corrugated rows 2 in A), that is, in the cross-grain direction of the cardboard, becomes extremely low. Therefore, if a prefabricated case is formed by arranging the corrugated rows 2 along the longitudinal direction of the case, as shown in FIG. 18(C), for example, the case will be extremely weak against loads from above. Therefore, normally the cardboard must be cut as shown in FIG. 18(B) and boxed as shown in FIG. 18(A), and the cutting direction of single-sided cardboard is limited.

In addition, in conventional single-sided cardboard, the out-of-plane bending strength in the vertical plane direction perpendicular to the X direction in Figure 17 is extremely low and it is easy to bend, so the body part warping occurs in the prefabricated case shown in Figure 18 (A). Also, when it is wet, the bottom surface tends to fall out.

As mentioned above, since the in-plane compressive strength and out-of-plane bending strength are low, in conventional assembling cases, the flap piece (1) at the opening of the case is folded and flattened when the body is not in use. (III) 75<It became easily damaged due to bending or bending, and the efficiency of storing the contents decreased.

Furthermore, due to the low out-of-plane compressive strength of conventional single-sided cardboard, it is not possible to obtain sufficient cushioning properties on each side of the case. It was completely unsuitable for the case.

Furthermore, in the conventional single-sided cardboard 1, the joint between the corrugated rows 2 and the flat liner 4 is
Therefore, if the ruled line part of this single-sided cardboard matches the parallel line part, it is easy to bend along that part, but for other ruled line parts, the part coincides with the parallel line part. If it deviates from the parallel line portion, it is difficult to accurately bend it along the ruled line.

In other words, in conventional single-sided cardboard, the ruled lines in the vertical grain direction (y direction) of the corrugated rows make it difficult to accurately bend the parts, and the dimensional accuracy of the case is significantly impaired during the box manufacturing process. This resulted in a high-cost structure in which only the areas corresponding to the peripheries of the parts were lined on both sides or reinforced with a double core.

In addition, conventional single-sided cardboard tends to warp and deform.
Striped grooves were formed on the flat plate liner surface, resulting in poor printability, and was particularly unsuitable for precision printing of POS bars and the like.

Furthermore, as is clear from FIG. 18(B), the unfolded sheet of single-sided cardboard for forming the assembly type case must be cut so that the direction of the corrugated rows is the transverse direction. It has been pointed out that because the cutting direction is limited, scraps are likely to occur and cutting efficiency is reduced.

The present invention was made in view of the above-mentioned problems.
The purpose is to have sufficient strength in all of the 5 in-plane compressive strength, 5 out-of-plane bending strength, and out-of-plane compressive strength, so that it can be cut in any direction of the corrugated rows without being restricted by the arrangement direction of the corrugated rows. It is an assembly type that can be made into boxes without causing body part deviation or bottom dropout, provides accurate dimensional accuracy in the ruled line part, has excellent printing accuracy, and improves cutting efficiency. There is a case to offer.

(Means for Solving the Problems) In order to achieve the above object, in the prefabricated case according to the present invention, vertical peaks and valleys are alternately formed on the sheet material to form corrugated rows in the horizontal direction. A smooth meandering waveform is formed, and the effective amplitude rate H in the corrugated row is
/L is 0.4 or more and 1°4 or less, and the actual meandering rate D/N is 0.4.
35 or less, the actual meandering polymerization rate D/L is 0.5 or more, the width adjustment ratio i in the advancing direction of the corrugated row is 8% + the stretching strain rate of the sheet material or less, and the top of the corrugated row is ,
A corrugated core body is formed with a bottom cross-sectional shape having a curved shape, a narrow chamfered shape, or a shoulder-drop shape, and a flat plate liner is adhered to at least one side of the corrugated core body to form a composite full gate body, and the composite corrugated body A ruled line is provided to define four rectangular sections that are continuous in the horizontal direction in the developed view, and an upper flap piece and a lower flap piece that can be bent independently are provided above and below the upper and lower ruled lines of each rectangular section. forming a glue margin on the side edge of the rectangular section at either the left or right side edge, folding the rectangular section along the ruled line, and gluing the glue margin to the rectangular section at the other side edge. The upper flap piece is made into a box that can be opened and closed.

(Embodiments) Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an example of a single-sided reinforced composite corrugated body 1o constituting a prefabricated case according to the present invention, which is composed of a corrugated core 11 and a flat liner 12. This corrugate core body 11 is formed by forming corrugate rows 13 in which peaks M and troughs V are vertically applied alternately in the 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 troughs V of the corrugated row 13.

Furthermore, the shape of the corrugated rows 13 of the corrugated core body 11 described above is determined in consideration of the need to have desired strength and ease of manufacture for practical use. First, in order to have a predetermined intensity, the effective amplitude rate H/
L, substantial meandering polymerization rate D/L, and substantial meandering rate D/N have the following values.

Note that the real amplitude rate H/L here refers to the corrugated row 13
The relationship between the amplitude H and the wavelength of a cross-sectional wave cut along a plane perpendicular to the X direction in FIG. 1 is shown, and more specifically, it is determined as described above. That is, in the cross-sectional waveform of the corrugated row 13 shown in FIG. 2, the actual amplitude H of the substantial cross-sectional waveform 15 obtained by linearly extending the slope of each inclined wall portion in both the up and down directions is determined, and the above-mentioned method is determined based on the period of the cross-sectional waveform. Real amplitude H
This is the ratio of

In addition, the actual meandering rate D/N indicates the relationship between the amplitude and the wavelength N when each corrugated strip is viewed in plan. Specifically, the actual meandering rate D/N is as follows: determined. That is, in the planar waveform of the corrugated row 13 in FIG. 3, that is, the meandering shape 16, the reference meandering shape 17 and the meandering shape obtained by linearly extending the slope of the meandering shape 16 around each neutral axis in both upward and downward directions. Based on the reference amplitude D' of 17 and the amplitude of the serpentine shape, the actual amplitude of the serpentine shape 18 is calculated as D−Do+
(D'-Do)xk, where the phrase o is defined as 3, is the ratio of the above-mentioned effective amplitude to the meandering period N.

Furthermore, as shown in Fig. 1, the substantial meandering polymerization rate D/L indicates the relationship between the amplitude of each corrugated strip and the wavelength of the cross-sectional wave when the corrugated strip is viewed in plan. ing.

Actual amplitude ratio> Using the slope gradient α of the oblique wall portion 2o of the corrugated row 13 with respect to the flat plate liner 12, that is, the effective amplitude ratio H/L in the cross-sectional waveform of the same row as a variable, the x-y plane for changes in that variable The fluctuation value of the shear stress Gx (see FIG. 4) in the inner X direction was experimentally confirmed, and the results were graphed as a group of shape-shear strength curves in FIG. Here, the functional expression of the curve group is expressed as Gx=g j (L/W), and G
x is the maximum shear stress index in the X direction, 1g, indicating the function symbol.

Further, j is a parameter, specifically, the substantial meandering rate D/N in the plane waveform of the corrugated row 13.

As is clear from the figure, as the effective meandering rate j increases from O to 0.5, each curve gradually shifts upward, seemingly in parallel, and the distance between them gradually decreases. , the most characteristic one is that each curve has an inclination angle of α-10@
(L/H ~ 0.1) to α-40° (L/H: 0.4)
It rises at a relatively steep slope until reaching Gx-1,0, and then becomes slightly gentler around am45' (L/H-0,5), and finally reaches θki55'' (L/1(-0,
7) It reaches the top nearby, but after that θ ~ 70 @ (L/H
-0,4) descended at a relatively steep slope to the vicinity, θ470”
After that, the slope becomes a little gentler and reaches 90°. In other words, the characteristics of each curve are α~55@(L/
This is the point where a common peak effect appears near H-0, 7).

In other words, judging from the above facts, the appropriate inclination angle α for obtaining the predetermined shear strength Gx that can be used practically is 55.
40″≦α≦700 centered on
can be defined as an appropriate real amplitude rate (shaded area in the figure).

Note that Gx-1,0 is j-0, that is, the maximum shear stress in the X direction at the peak time observed in the current cardboard-like composite corrugated body.

Substantial serpentine 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 out-of-plane bending rigidity in the direction perpendicular to the corrugated rows.

That is, as shown in FIG. 6, it is the maximum bending stress in the X direction in the z-y plane.

Here, the ratio of the amplitude in the planar waveform to the periodicity in the cross-sectional waveform of the corrugated row 13, that is, the effective meandering polymerization rate D/L, is taken as a variable, and the variation value of the above maximum bending stress (index) with respect to the change in the variable is calculated. Confirmed experimentally,
The results are shown in FIG. 7 as a group of shape-bending strength lines.

And the functional formula of the curve group is M x −h:,
It is expressed as (D/L), where Mx is the maximum bending stress index in the X direction and h is the function symbol. Further, j is a parameter, specifically, the substantial meandering rate D/N.

As is clear from the figure, as the effective meandering ratio j value increases from 0 to 0.15, each of the curves shifts upward while changing its slope slightly, and the intervals between the curves gradually become smaller. However, the most characteristic feature is that each curve has a gentle slope from 0 to 0.5 of the effective meandering polymerization rate D/L, but once /L exceeds 0.5, it rises steeply, and Furthermore, when D/L exceeds 1.0, the slope becomes steeper than before and continues to rise, meaning that each curve has a specific D/L value that causes the above two bending points to occur. , the value is common to each curve with different j.

Note that Mx-1,0 is j-0, that is, the bending stress observed in the current cardboard-like composite corrugated body.

As mentioned above, it was revealed that the shape-bending strength curve MX-hj (D/L) has two bending points when the actual meandering polymerization rate D/L is 0.5 and 1.0. When observing the change in the /L value with respect to the mutual positional relationship of the corrugated rows and the planar meandering shape, first, when D/L<0.5, each bent part on the central axis of the bottom meandering shape of the corrugated rows is adjacent to each other. 8 (A
)) When D/L-0,5, the bent part of the corrugated row is located beyond the y-direction line of the adjacent corrugated row (Fig. 8(B)), and D/L- 1.0, each bend on the central axis of the top meandering peak of the corrugated row moves onto the y-direction line of the adjacent corrugated row (FIG. 8(C)'), D/L>1. When it becomes O, the bent portion of the corrugated row is located further beyond the y-direction line of the adjacent corrugated row (FIG. 8(D)).

Furthermore, when observing the change in the positional relationship of the planar meandering shape of the corrugated rows with the value of D/L with respect to the cross-sectional shape of the reinforced composite corrugated body on the y-direction line, 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 obvious. That is, first, when the cross-sectional shape of the reinforced composite corrugated body has D/=0.5, the reinforced corrugated body is joined only to the flat liner 12 on one side, so its truss-like structure is somewhat unstable. The bending strength Mx is extremely small. At D/L-0,5, the reinforced corrugated body is joined to the flat plate liners on both the upper and lower surfaces, so its truss-like structure changes its morphological characteristics to be suddenly more stable than the above-mentioned truss-like structure. , and further D/L>0.5
As the value is gradually increased, the inclination angle of the web (diagonal member) of the truss-like structure becomes steeper, so that the strength Mx
The rate of increase is greater than when D/L<0.5. Furthermore, when D/L-1,0, the truss-like structure of the reinforced corrugated body doubles the bonding density with the flat plate liners on both the upper and lower surfaces compared to that of D/L-0,5. Compared to this, the morphological characteristics suddenly changed to a more stable one, and as the value of D/L>1.0 is increased, the inclination angle of the web of the truss-like structure becomes steeper, and only a single-sided flat liner Since the vertical height of the triangle formed by the web and flat liner joined to becomes large, the strength M+[ increases at a higher rate of increase than when D/L<1.0.

As mentioned above, the shape-bending strength curve formula Mx-h.

It has been revealed that there are two singularities in D/L that sharply increase the bending strength Mx at D/L-0,5 and D/L-1,0. In order to ensure a bending strength Mx suitable for putting the corrugated body into practical use, the actual meandering polymerization rate D/L should be D/L≧0.5, and the range is shown by the diagonal lines and nets in Figure 7. It is shown as a line of sight, and more preferably D/L is D/L≧1.0, and the range is shown in the mesh line in the figure.

Other Requirements> In order to obtain the desired strength in the corrugated rows, it is necessary to satisfy the following conditions in addition to the various conditions described above.

That is, the various structural strengths of the reinforced composite corrugated body according to the present invention can only be obtained by integrally joining the reinforced corrugated body and the flat plate liner, and in particular, the shear strength in the X direction and the bending strength in the X direction are It greatly depends on the bonding area between the reinforced corrugated body and the flat liner,
If the bonding method, adhesive, etc. are the same, it will be proportional to the bonding area.

Therefore, it is important to make the contact area relatively wide. Specifically, as shown in FIG. 9, the reinforced corrugate body is formed so that the cross-sectional shape of the top and bottom of the corrugated row is such that the bending width W at the top and bottom is as large as possible. It is.

Next, in order to manufacture a reinforced corrugated body that is easy to manufacture, it is necessary for the corrugated row to satisfy the requirements shown below.

First Requirement (Width-Clamping Ratio)> Here, the width-clamping ratio refers to the shrinkage rate of the width of the flat sheet after forming the corrugated rows relative to the width of the flat sheet before forming the corrugated rows.

First, the manufacturing process of the reinforced corrugated body will be described. As shown in FIG. 10, a pair of forming rollers are formed by providing tooth-shaped rows 22 in multiple stages in the circumferential direction on the circumferential surface, which approximately correspond to the corrugate rows to be manufactured. A corrugated sheet 24, which has been subjected to a predetermined width adjustment, is inserted between 23 and 23.

Then, a corrugated row having a desired shape is manufactured by pressure molding between both forming rollers 23 (roll forming method). In addition, for the above-mentioned corrugation, the width adjustment applied to the workpiece sheet 24 (preliminary width adjustment rate 1o) is the final width adjustment rate i and the path distance - (strictly speaking, the sheet itself contracts during processing, so i ≧ slightly 10).

If the width adjustment ratio i (preliminary width adjustment ratio io) is increased beyond a certain limit, excessive wrinkles and breaks in the X direction will occur frequently. This is H of the cross-sectional waveform of the corrugated core body 11.
/L becomes too large, causing locally irregular buckling deformation in the cross-sectional waveform that is pressurized immediately after being supplied between the forming rollers 23, causing collapse and consequent kinks, and at the same time, in the width direction. This is because the uniform distribution of the width adjustment ratio i is significantly hindered.

More specifically, the limit of the predetermined width adjustment ratio i will be described based on the graph of FIG. 11 showing the correlation between the amount of collapse and the preliminary width reduction ratio 10. The predetermined width adjustment ratio i is given by i>10+β. Here, β is the limit stretching strain rate in the width direction of the corrugated sheet 24, and if this limit is exceeded, the material strength deteriorates significantly (the strength is reduced by 30% for the time being), so it is not practical. This is the limit value at which it will no longer be provided. For paper sheets, steel sheets, semi-rigid plastic sheets, etc. with low stretching limits, 2
．． 0% is the upper limit of the critical stretching strain rate β, and in the case of aluminum sheets and plastic sheets, the stretching limit is somewhat high, so 5.0% is the critical stretching strain rate β.

In addition, the frequency index of collapse in the figure is calculated by setting the advance width adjustment rate io to 1.
The frequency of collapse when o-5.0% is assumed to be 1.0.

As is clear from the figure, the value of the collapse frequency increases with the change in the advance width adjustment rate of 10, but the value is small. -8,0
%, the increase becomes rapid. Therefore, in order to suppress the occurrence of collapse of the sheet 01 to be processed as low as possible, the preliminary width adjustment ratio to should be set to o<i. It is necessary to keep it within the range of 58.0% (shaded area in the figure).

Therefore, in order to process and form the final corrugated core 11 by a stable and high-speed roll forming method, it is necessary to satisfy O<i≦8+β, and specifically, the stretching deformation rate β of the processed sheet should be When 0≦β≦2.0%, the value is set in the range of 0×5≦10.0%.

Second Requirement As mentioned above, since it is necessary to have a certain strength, the top and bottom of the corrugated rows are made to have a certain bending width W. In order to satisfy this condition, for example, as shown in FIG. If the cross section of the corrugated row 13' is approximately trapezoidal with flat tops and bottoms M-V as shown in FIG. The surface is mainly centered around mountains and valleys.
, an in-plane curved deformation is forced at the bend near fIz. Since the trapezoidal surface is flat, the outer side of the row plane of the trapezoidal surface around the bent part (shaded area in the figure)
In this process, the material is subjected to stretching deformation due to tension, causing significant strain deformation or breakage damage to occur intensively, making it unusable for practical use.

In order to solve this problem, various cross-sectional shapes of the top and bottom portions MV are made into shapes as shown in FIGS. 9(A) to 9(D). In other words, do you completely eliminate flat surfaces in the cross-sectional shape of each section/bottom M-V (A-1, A-2, A-4,
B-1, B-3, C.

D) Leave a very limited flat surface (A in the same figure)
-3, B-2) Form.

The former type of connection mainly facilitates the in-plane curve deformation of the bent portion due to the predetermined width adjustment in the y direction, thereby suppressing the generation of residual strain stress such as strain deformation as much as possible, resulting in breakage and damage. It has become possible to completely prevent the occurrence of

In the latter case, there are only a few flat surfaces remaining in the top and bottom cross-sections, which results in narrow band-like flat surfaces, so that the local in-plane curve deformation of the bent portion due to the predetermined width reduction in the y direction If the amount of in-plane stretching strain is used and no breakage damage occurs, the residual strain stress will be almost negligible.

Third Requirement> Furthermore, in the present invention, the planar meandering shape of the corrugated rows 13 is a meandering shape with a smooth plane wave shape.

Specifically, the entire length of the corrugated row 13 is made into a continuous curved line (Fig. 13 (A)), the bent part is made into a curved line and they are connected with a straight line (Fig. 13 (CB))), or the bent part is made into a straight line. (C)
), the entire length is made into a trapezoid shape by connecting straight line segments, and the corners are chamfered ((D) in the same figure), or the whole length is made into a trapezoid shape by connecting straight line segments, and the internal angle θ of the opposite oblique side is set to 120＠ or more. By making it relatively flat ((E) in the same figure), the interior angle θ
A relatively flat zigzag shape with 120 @ or more can be used (see figure (F)), or the bent portion can be a curved line and these can be connected by a wavy curve with a relatively small period (see figure C).
G), (H)).

As mentioned above, by forming the meandering shape of the corrugated row according to the present invention as a smooth planar waveform, it was possible to remove various sharp protrusions in the waveform. Since the row 22 has a meandering shape with a smooth plane wave shape, the corrugated sheet 24 is dispersed and pressed over a relatively wide area by the toothed row 22 during roll forming. As a result, local distortion deformation can be avoided, and at the same time the work sheet can be
Sliding on the tooth profile due to the dashed line in the direction is not hindered in any way, and tensile strain deformation in the X direction and the occurrence of breakage due to it can be prevented.

Furthermore, since the sliding movement of the corrugated work sheet 24 on the tooth pattern row 22 during fine adjustment of width adjustment in the y direction is not hindered in any way, tensile strain deformation in the y direction and the occurrence of breakage due to it are sufficiently suppressed. As a result, roll forming of the reinforced corrugated body of the present invention can be performed stably and at high speed.

Regarding overall shape conditions> Suitable shape conditions for the corrugated rows can only be achieved by satisfying both the above-mentioned strength and manufacturing requirements, and specifically, the following.

That is, it is a group of shape curves shown in the graph of FIG. 14, and its shape curve formula is expressed as H/L-f, (D/N). In addition, this curve formula has a substantial meandering polymerization rate D/L.
, the bending width W has no relation.

The above shape curve equation holds true 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 established by the shape ratio and explains only the shape characteristics of the corrugated core 11, and has nothing to do with the structural strength and workability of the corrugated core.

More specifically, the combinations of variable values H/L, D/
There is only one N, for example, the value of the variable constant i and the variable H/L
The combination of values of variable D/N uniquely determines the value of variable D/N, or the combination of variable constant i and variable D/N determines variable H/L, or the combination of variables H/L and D/N The combination of values determines the value of constant l.

The shape curve group in the figure is drawn as a similar-like hyperbola group obtained by parallel movement, and the width adjustment ratio i is set to 5%≦i≦2.
Only the shape curve set as 0% is illustrated, and i<5% around it.
and i>20% shape curves are omitted.

The above group of shape curves shows the shape of each part, that is, the real amplitude, which is formed by varying the width closing ratio i of the actual corrugated body having various real meandering ratios D/N at the real amplitude ratio H/L-〇. Rate H/L.

This figure can be drawn by measuring the change in the real meandering ratio D/N. Among the image shape conditions related to structural strength and workability, the optimum range that simultaneously satisfies the two essential real amplitude ratios, which are the most important for practical application, is the appropriate real amplitude ratio H/L. With L-0,7 as the optimum value, the optimum range is limited as 0.4≦H/L≦1.4, and the shape curve with the appropriate width adjustment rate i is O<H, /L≦10% (
D/N), and the appropriate effective meandering rate D/N is ultimately limited to the optimal range of O<D/N≦0.35, as shown in the graph of Fig. 14. The shaded area indicates the optimal range.

Using this graph showing the optimum range of the shapes of the above-mentioned shape curve group, the shape design of the corrugated rows of the reinforced corrugate body and the shape design of the tooth pattern rows of the forming roller according to the present invention can be efficiently carried out. For example, H/L that is suitable in advance.

After setting i, there is a method to determine and design the D/N that enables a reinforced corrugated body that has both high structural strength and excellent workability, and to set the appropriate H/L and D/N in advance. Pre-corrugation, which calculates and controls the i value that enables this, is useful in applications such as automatic control systems for rollers (a device that processes a flat sheet into a corrugated sheet 24).

Note that the above-mentioned shape curve is established regardless of the type of material of the sheet to be processed.

*Experimental Results To introduce three characteristic cases from among the many examples, first, in the first case, the shape of the corrugated rows using a paper sheet has an effective amplitude ratio of H/L-0.7. Real meandering rate D/N-0.18, real meandering polymerization rate D/L-1.0
．． The reinforced corrugated body, which is formed with a flattening ratio of L-5% and a smooth waveform consisting of continuous curves, and a curved cross-section at the top and bottom of the rows, is not processed at a speed of about 150m/min. It was obtained by roll forming using a predetermined heated forming roller without causing any trouble.

In addition, since the pre-width ratio was set to 5% and the stretching strain rate was set to β~0 during roll forming, the reinforced corrugated body was an ideal folding material characterized by being able to be expanded topologically. Obtained as a version structure.

Further, a reinforced composite corrugated body obtained by integrally bonding the reinforced corrugated body with two flat paperboard sheets on both sides thereof is a conventional reinforced corrugated body having the same sheet material row amplitude H0, the same period, and the same bending width W. Although the amount of the sheet used increased by 2% compared to the corrugated board, it was confirmed that the maximum shear strength in the X direction was about 50% higher, and the target strength in the X direction was about 60% higher.

Next, as a second case, using a paper sheet, the effective amplitude ratio of the corrugated rows H/L-0.7. Substantial meandering polymerization rate D/L
-1,0, real meandering rate D/N-0゜24, width adjustment rate i-
8%, the reinforced corrugate body is formed by making the meandering row shape into a continuous curve with a smooth plane wave shape, and the cross-sectional shape of the top and bottom of the rows is curved. No processing troubles occur at a speed of 100 m/min. It was obtained by roll forming using a predetermined heated forming roller. In addition, during roll forming, processing was performed with a pre-width ratio of 6.5% and a sheet stretching strain rate of β41°5%, so it was somewhat difficult to develop the topology, and the material strength in the width direction of the processed sheet It can be said that the sake cup has deteriorated somewhat. Furthermore, a reinforced composite corrugated body obtained by integrally laminating two flat paperboard sheets on both sides of the reinforced corrugated body was compared with a known corrugated board under the same conditions.
Although the amount of processed sheet used increased by 3%,
It was confirmed that the maximum shear strength in the direction was increased by about 55%, and the target strength in the X direction was increased by about 75%.

In the third case, a flat paperboard sheet is integrally laminated on one side of a reinforced corrugated body made of a paper sheet that has been processed and formed by the same roll-forming method as the reinforced corrugated body of the first case and has the same shape. The single-sided reinforced corrugated body obtained by this method is different from the known single-sided corrugated board in terms of sheet material.

Comparing conditions such as the same row amplitude H0, the same period, and the same bending width W, the amount of sheet used increased by 3%, but the target strength in the X direction increased by about 220%. A remarkable result was confirmed.

As seen in the first and second cases above, the increase in product cost is 10% or less compared to known corrugated cardboard (however, the increase in material cost is 4% or less, and the increase in manufacturing cost due to a decrease in roll forming speed is 6% or less) Since the difference in various structural strengths is 50% or more, product value - strength / cost ≧ 150 / 110 - 1.36, and since other performances are considered to be the same, it is approximately 40%. The above disparity in product value is clear, and in the third case, the increase in product cost is 7% (however, the increase in materials is 3% or less).

Since the manufacturing cost increase is 4%) and the difference in bending strength is 220%, product value - strength / cost ≧ 320/107 - 2.99, and other performances are assumed to be the same, so it is approximately 200%. It was revealed that the difference in product value was more than %.

Next, the single-sided reinforced composite corrugate bodies (H/L-0,5, D/L-1,1,
D/N-0.32) was compared in strength with a conventional single-sided cardboard (H/L-0.5) as shown in FIG.

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

As is clear from Table 1, when comparing the composite corrugated body used in the present invention with conventional single-sided cardboard,
The in-plane compressive strength in the y-direction is almost the same for both, but in the x-direction, the composite corrugated body has a strength of 3
It is clear that the strength is twice as strong.

Table 2 shows the test results for the out-of-plane compressive strength, and from this table it can be seen 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 corrugated cardboard. That is clear.

Table 3 shows the test results for the out-of-plane bending strength in the plane direction perpendicular to the X direction in FIGS. It is clear that it has extremely high bending strength, approximately 22 times greater than cardboard.

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

The single-sided reinforced composite corrugated body having many excellent properties as described above is cut into a predetermined shape and bent to obtain an assembly type case according to the present invention.

FIG. 15(A) shows an unfolded sheet 25 for obtaining a prefabricated case according to the first embodiment of the present invention.
3 are arranged in a meandering manner, and the corrugate core 11 is arranged so that the corrugate core 11 is located on the inner surface of the case.
A flat plate liner material 12 is adhered to one side of 1. In this developed sheet 25, there are ruled lines 2 that define four horizontally continuous rectangular sections n, IV, V, and Vl.
6, and independently bendable upper flaps and lower flaps are formed above and below the upper and lower ruled lines of each horizontally long rectangular section. In the illustrated example, a glue margin 27 is formed on the side edge of the horizontally long rectangular section V at the left end. When this unfolded sheet is fed into an automatic box making machine, it is folded along the ruled lines 26, and the glue allowance 27 is glued to the horizontally long rectangular section (■) at the right end.
The two lower flaps ■ are sequentially folded and connected with fasteners (not shown), resulting in a position 1'? as shown in FIG. 15(B). A type A prefabricated case 28 is obtained.

FIG. 16(A) shows an unfolded sheet 25a for obtaining an assembly type case according to a second embodiment of the present invention.

In this unfolded sheet 25a, the longitudinal direction of the corrugated rows 13 extends in the longitudinal direction of the unfolded sheet 25a, and the other configurations are the same as in the first embodiment.

In the first and second embodiments described above, the flat liner material 12 is bonded to the outer surface of the boxed case, but this is done in consideration of the convenience of printing on the surface. If desired, a flat liner material may be located on the inner surface.

Further, in the above embodiment, only the case where the corrugated rows extend along the longitudinal direction or the lateral direction of the unfolded sheet was explained, but the corrugated rows are inclined at an arbitrary angle with respect to the longitudinal direction of the unfolded sheet. It may be formed or cut in a state in which it is

Next, a prefabricated case (first embodiment) according to the first embodiment of the present invention will be explained.
The conventional prefabricated case (K180-8CP120) shown in Figure 5 (B)) and Factor 18 (A) were subjected to a compressive strength test in the vertical direction (1-I11 direction) in Figure 15, and the results were are shown in Table 4.

Table 4 Box Compressive Strength As is clear from the test results, when comparing the product of the present invention and the conventional product, the compressive strength in the I-m direction, that is, the vertical direction, is higher for the product of the present invention than for the conventional product. It was 2.9 times larger.

In addition, the out-of-plane compressive strength of each solid body itself is strongly required for a prefabricated case, that is! It is clear that the impact performance of the product of the present invention is improved by about 2.0 times compared to the conventional product as shown in Table 2 above.

The material of the single-sided reinforced composite corrugate body according to the present invention is paper or paper-based material, but it may be a single material of various papers or a composite laminate of various papers and films made of various non-paper materials. There are various other processed papers coated with, impregnated with, or attached with various cellulose or non-cellulose materials, and suitable combinations of the above-mentioned materials are also effective in the present invention.

In addition, in the above embodiment, the case of an assembly type case using a single-sided reinforced composite corrugated body in which a flat plate liner is bonded to one side of a corrugated core body was explained. Even when a prefabricated case is formed using a corrugated body,
Compared to the case where a conventional prefabricated case is formed using double-sided cardboard, excellent effects can be achieved due to the same relative relationship as the relationship between the single-sided cardboard and the single-sided reinforced composite full gate body in the above embodiment.

(Effects) As described above, the prefabricated case according to the present invention is a corrugated case in which the corrugated rows are formed by alternately applying peaks and troughs in the vertical direction, and the corrugated rows are meandered in a planar manner. Because a core body is used, the manufactured prefabricated case has large compressive strength in the front and back and left and right directions due to the excellent in-plane compressive strength, vertical out-of-plane compressive strength, and out-of-plane bending strength of the corrugated core itself. It has excellent cushioning performance to protect the contents from external impacts, and the flap piece at the opening can be bent to have great bending strength.

Fully protected against bending, breakage, etc.

In particular, the single-sided reinforced composite full gate body used in the present invention has an extremely high in-plane compressive strength in the X direction compared to conventional single-sided cardboard, and has a strength equal to or higher than the in-plane compressive strength in the y direction. By cutting the corrugated rows in any direction to obtain a spread sheet, it is possible to manufacture a prefabricated case having sufficient strength in all plane directions.

The fact that the above corrugated rows can be cut in any direction means that it is possible to continuously manufacture single-sided reinforced composite corrugated bodies with the most economical maximum width, and to combine unfolded sheet bodies vertically and horizontally within that maximum width. This means that the material can be cut to the minimum scrap size, improving width efficiency and, as a result, achieving high productivity.

In addition, the core material that makes up conventional prefabricated cases is unidirectional (
Since the straight corrugated strips are formed in parallel only in the y direction, they tend to warp and deform in the unfolded sheet state, which tends to cause failures in the automatic box making machine. However, the present invention In the case of a prefabricated case, the corrugated core body has corrugations in the X and Y directions, and there is no warpage or deformation at all even in the unfolded sheet state.
There is no shape distortion at all in the case body after the case is manufactured.

In addition, because the core material and flat liner material that make up conventional prefabricated cases are laminated in parallel straight lines, the lamination density is low, and the striped uneven surface is created by the laminated and non-laminated areas. It was easy to form and had poor printability. On the other hand, in the case of the prefabricated case of the present invention, since the corrugated core and the flat sheet material are bonded on meandering parallel curves, the bonding density is increased and warping and deformation is prevented, as described above. This prevents the occurrence of striped uneven surfaces, maintains the flatness of each surface of the case, and improves P.
The suitability for precision printing of OS bars, etc. is greatly improved.

Furthermore, in the present invention, since the bonding portion between the corrugated core and the flat liner material is on a meandering curve, when a ruled line is provided along the longitudinal direction of the corrugated rows, in many cases, the ruled line is Since it passes through the joints intermittently, the ruled line can be folded reliably and precisely. In particular, when the meandering polymerization rate D/L≧1, even if the ruled line is placed at an arbitrary position, it always intersects the corrugated rows at multiple locations, so that the ruled line bending becomes more precise.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view showing a partially broken flat liner material of a composite corrugated body used in the present invention, FIG. 2 is a diagram showing a cross-sectional shape in the corrugate row X direction of the composite full gate 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 characteristics, FIG. 3(B) is a plan waveform diagram showing the ridgeline of the meandering corrugated rows, and FIG. 4 is a plan view showing the composite corrugated body of the present invention. Figure 5 schematically shows the direction of shear stress in the composite corrugated body.
Figure 6 is a shape-shear strength curve graph showing the correlation between the maximum shear stress index in the in-plane X direction and the slope θ of the sloped row wall surface or the effective amplitude ratio H/L of the row. A diagram schematically showing directions, and FIG. 7 shows the maximum bending stress index in the X direction outside the y-x plane, the effective meandering polymerization rate D/L of the rows, and the actual meandering rate D/N in the composite corrugated body.
Figure 8 is a graph of the shape-bending strength curve showing the correlation between the 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 cross-sectional waveform diagram of each corrugate row X direction of the composite corrugated body, and FIG. 10 is a broken perspective view schematically showing the roll forming method used to process and form the reinforced corrugated body. , Fig. 11 is a diagram showing the relationship between the collapse frequency index of the corrugated work sheet and the pre-width ratio during roll forming of a composite corrugated body, and Fig. 12 is a diagram showing the relationship between the collapse frequency index of the corrugated work sheet and the pre-width ratio during roll forming of a composite corrugated body. A diagram showing an example of a row, FIG. 13 is a diagram showing various planar waveforms showing meandering waveforms of a corrugated row in a composite corrugated body, and FIG. 14 is a diagram showing the effective amplitude ratio H/L of a corrugated row in a composite corrugated body according to the present invention. Graphs of shape curves showing the correlation between the effective meandering rate D/N and the y-direction width adjustment rate i, Fig. 15 (A) and (B
16(A) and 16(B) are respectively developed sheet and box drawings of the assembly type case according to the first embodiment of the present invention, and FIGS. Sheet diagram and box manufacturing diagram; Figure 17 is a partially cutaway partial perspective view of a conventional single-sided cardboard flat cardboard; Figure 18 is
Figures (A) to (C) are a developed sheet diagram and a box manufacturing diagram of a conventional assembly type case, respectively. 10...Composite corrugate body 11...Corrugate core body 12...Flat liner material 13...Corrugate rows 25...Development sheet 26・・・・・・Assembly case

Claims (1)

[Claims] Vertical peaks and troughs are alternately formed on the sheet material to form a corrugated row into a horizontally smooth meandering waveform, and the effective amplitude ratio H/L in the corrugated row is
0.4 or more and 1.4 or less, and the actual meandering ratio D/N is 0.35.
Hereinafter, the actual meandering polymerization rate D/L is 0.5 or more, the width adjustment ratio i in the advancing direction of the corrugated row is 8% + the stretching strain rate of the sheet material or less, and the top of the corrugated row, A corrugate core is formed with a bottom cross-sectional shape having a curved shape, a narrow chamfered shape, or a shoulder-drop shape, and a flat plate liner is adhered to at least one side of the corrugate core to form a composite corrugate body, and the composite corrugate body A ruled line is provided to define four rectangular sections that are continuous in the horizontal direction in the developed view, and an upper flap piece and a lower flap piece that can be bent independently are provided above and below the upper and lower ruled lines of each rectangular section. forming a glue margin on the side edge of the rectangular section at either the left or right side edge, folding the rectangular section along the ruled line, and gluing the glue margin to the rectangular section at the other side edge. An assembly type case characterized in that the upper flap piece can be opened and closed freely to form the case.