JP7123418B2 - Containment structure, forming sheet for containment structure and method of manufacturing containment structure - Google Patents

Description

The present invention relates to a containment structure, a forming sheet for a containment structure, and a method of manufacturing a containment structure.

BACKGROUND ART Bags such as handbags and eco-bags used when going out, and storage tools such as handbags provided by stores when shopping are known.

Such receptacles usually have a predetermined volume in order to ensure the receptacle volume. Therefore, when carrying the container, a certain amount of occupied space is required regardless of whether or not the container is stored therein. Against this background, there is known a container that consists of a sheet member punched into a predetermined shape, the sheet member remains flat when not in use, and the sheet member can be assembled and used when used ( For example, Patent Document 1).

JP-A-11-105889

However, the container of Patent Literature 1 requires time and effort in both the assembly work and the deployment work. Further, if the assembly work and the deployment work are repeated, the strength of the sheet member will be reduced during the repeated work, and as a result, the sheet member will not be usable as a container.

In view of such circumstances, the present invention provides a storage structure, a forming sheet for a storage structure, and a storage structure that can be applied to a storage tool that is easy to assemble and deploy and that is resistant to repeated assembly and deployment. We are trying to provide a method.

The accommodation structure of the present invention includes a bag portion, a plurality of parallel folds provided in the bag portion, and a plurality of bending folds provided in the bag portion, wherein the bending folds are located between the parallel folds. In the above, it extends straight in the direction intersecting the parallel fold and is bent at the position where it intersects the parallel fold, and when the bending fold is a valley fold, the parallel fold that intersects the bending fold at an obtuse angle is a valley fold, the parallel fold that intersects the bending fold at an acute angle is a mountain fold, the bag portion can be folded and unfolded at the parallel fold and the bending fold, and the bag portion is a tubular body folded at two edge creases parallel to the parallel folds, comprising a bottom forming portion forming a bottom of the tubular body, the bottom forming portion being the tubular It is provided at the edge of the body on the side of the first opening and is folded back along the folding line to form the bottom. the bottom of the cylindrical body is formed by folding back the cylindrical body at the diagonal crease, and the bottom forming portion includes a vertical crease that is an extension of the parallel crease; A horizontal fold line perpendicular to the vertical fold is formed, the oblique fold does not intersect the vertical fold, the vertical fold does not change even if it straddles the fold line, and crosses the horizontal fold line. It is characterized in that the crease changes when straddling .

A forming sheet for a storage structure of the present invention includes a sheet having a front portion that is the front of a bag and a bottom forming portion that is the bottom of the bag, a plurality of parallel folds provided on the front portion, and the and a plurality of bending folds provided in the front portion, wherein the bending folds extend straight in a direction intersecting the parallel folds between the parallel folds and are bent at the intersection position with the parallel folds. When the bending fold is a valley fold, the parallel fold that intersects the bending fold at an obtuse angle is a valley fold, the parallel fold that intersects the bending fold at an acute angle is a mountain fold, and The front portion is demarcated by two edge creases, and an oblique crease extending obliquely toward the bottom formation portion is formed starting from a boundary between the front portion and the bottom formation portion. , a slit extending from an end of the bottom forming portion is formed, the terminal end of the diagonal fold is located in the slit, and the bottom forming portion is folded back along a folding line at the boundary with the front portion to form the bottom. The bottom forming portion is formed with a vertical fold that is an extension of the parallel fold and a horizontal folding line perpendicular to the vertical fold, and the oblique fold does not intersect the vertical fold and does not intersect with the vertical fold. The vertical crease is characterized in that the crease does not change even when crossing over the folding line, but changes over the horizontal folding line .

In the method for manufacturing the housing structure of the present invention, a predetermined crease is formed on a base material in which a front portion serving as the front surface of a cylindrical body and a bottom forming portion serving as the bottom portion of the cylindrical body are set. a slit forming step of forming a slit in the base material that has undergone the creasing step; a cylindrical body forming step of forming the cylindrical body from the base material; a flattening step of folding the tubular body along end creases parallel to each other and flattening the tubular body; and a bottom forming step of forming a bottom by closing the opening of the cylindrical body, and extending obliquely toward the bottom forming portion starting from a boundary between the front portion and the bottom forming portion. A diagonal fold is formed, the slit extends from the end of the bottom formation, the terminal end of the diagonal fold is located at the slit, and the bottom formation is folded back along a folding line at the boundary with the bottom formation. In the bottom forming portion, a vertical fold line extending from the parallel fold line and a horizontal fold line orthogonal to the vertical fold line are formed. It is characterized in that the vertical creases do not cross each other, and the creases do not change even when crossing the folding lines, and the creases change when crossing the lateral folding lines .

ADVANTAGE OF THE INVENTION According to the present invention, there are provided a storage structure, a forming sheet for a storage structure, and a method for manufacturing the storage structure, which are applicable to a storage tool that is easy to assemble and deploy and is resistant to repeated assembly and deployment. be able to.

1 is a perspective view showing an outline of a bag having an accommodation structure; FIG. (A) is a plan view of the bag, and (B) to (F) are a left side view, a front view, a right side view, a rear view and a bottom view of the bag, respectively. FIG. 4 is an exploded view of a base material forming a bag; It is a flowchart which shows the outline|summary of the manufacturing method of a container. It is explanatory drawing showing the mode in an opening part folding|folding process. It is explanatory drawing showing the state in a cylindrical body formation process. It is explanatory drawing showing the state in a bottom part formation process. It is explanatory drawing showing the state in a bottom part formation process. It is explanatory drawing showing the state in a bottom part formation process. FIG. 4 is an explanatory diagram showing a state in the middle of folding a bag; FIG. 4 is an explanatory diagram showing the shape of the end face of the bag on the XY plane;

Hereinafter, for convenience of explanation, an arbitrary direction in the horizontal plane is defined as the X direction, a direction orthogonal to the X direction among arbitrary directions in the horizontal plane is defined as the Y direction, and a direction orthogonal to the horizontal plane is defined as the Z direction.

As shown in FIGS. 1 and 2, the bag 10 can accommodate desired items in its internal storage space.

The material for forming the bag 10 is not particularly limited as long as it is within the scope of the purpose of the present invention. For example, materials for forming the bag 10 include paper (cardboard and thin cardboard), cloth, leather, plastic, metal, and the like. Of course, the material for forming the bag 10 may be a combination of these.

The bag 10 has an opening edge portion 12 provided on the Z-direction upper side of the bag 10, a bottom portion 14 provided on the Z-direction lower side of the bag 10, and a front portion 16 provided between the Z-direction upper side of the bottom portion 14. , provided.
Although not shown, the boundary line between the opening edge portion 12 and the front portion 16 is located between a bending crease 30 and an insertion hole 12X, which will be described later. A boundary line 14X between the bottom portion 14 and the front portion 16 extends in the X direction.

The front portion 16 includes parallel folds 20 extending in the Z direction, bending folds 30 intersecting the parallel folds 20, and edge folds 40 extending in the Z direction. The bending fold 30 intersects the parallel fold 20 .

Two parallel creases 20 are provided. In one parallel fold line 20, a mountain fold line YM (a solid line portion in the drawing, the same applies to other drawings) and a valley fold line TN (a broken line portion in the drawing, the same applies to other drawings.) are combined with a bending fold line 30. are arranged alternately with the intersection point M as a boundary.

The bending crease 30 has a straight portion that extends straight between the parallel creases 20 and a bent portion that intersects the parallel crease 20 at a predetermined angle. The bend fold 30 bends at the intersection with the parallel fold 20 . The direction of bending is reversed at adjacent intersection positions, such as upward in the Z direction, downward in the Z direction, upward in the Z direction, and so on.

Five bending creases 30 are provided at predetermined intervals in the Z direction. The spacing between adjacent bending folds 30 is preferably equal. The straight portion of the bent fold 30 is parallel to the straight portion of the bent fold 30 aligned in the Z direction. The bending folds 30 are formed by alternately lining up the mountain folds YM and the valley folds TN in the Z direction.

Furthermore, when the bending fold 30 is the valley fold TN, the parallel fold 20 that intersects the bending fold 30 at an obtuse angle is the valley fold TN, and the parallel fold 20 that intersects the bending fold 30 at an acute angle is the mountain fold YM. be. Such a fold pattern is the so-called Miura fold.

The edge crease 40 extends in the Z direction and is provided at positions corresponding to the opposing positions P1 and P2 in the end face shape of the bag 10 in the XY plane (FIG. 11). It should be noted that the edge crease 40 may extend to the opening edge 12 at its upper end and may extend to the bottom 14 at its lower end.

Opening edge 12 and bottom 14 are preferably stronger than front portion 16 . In order to provide a higher strength than the front portion 16, the forming material in the opening edge portion 12 and the bottom portion 14 may be folded back, or the forming materials may be laminated together.

In FIG. 1, the opening edge portion 12 is formed by folding back the opening end on one side of the cylindrical body T (FIG. 6, which will be described later).

The bottom portion 14 extends in both directions in the Y direction (forward and backward directions) from the front portion 16 in FIG. 1, and extends downward in the Z direction from the front view 16 in FIG. The bottom portion 14 is folded back at the other open end of the cylindrical body T (FIG. 6, which will be described later), and the opening of the cylindrical body T is closed.

Bag 10 may include a handle structure. The handle structure is positioned at the center of the opening edge 12 in the X direction, and has an insertion hole 12X into which a hand or fingers can be inserted. In this embodiment, the insertion hole 12X is preferably formed between the two parallel folds 20. As shown in FIG.

Next, the base material 200, which is the material for forming the bag 10, will be described.

As shown in FIG. 3, the base material 200 is a rectangular sheet material, the sides of which extend in the X and Z directions. The base material 200 includes a one-side base material portion 110 that forms one side surface (FIG. 2C) of the bag 10 and the other side base portion 110 that forms the other side surface of the bag 10 (FIG. 2E). A material part 120 and a connection margin 130 for making the base material 200 into a tubular body are provided.

The one-side base material portion 110 , the other-side base material portion 120 , and the connection margin 130 are arranged from the left side to the right side (in the paper surface direction) of the base material 200 . Edge creases 40 are provided at the boundary between the one-side substrate portion 110 and the other-side substrate portion 120 and the boundary between the other-side substrate portion 120 and the connection allowance 130, respectively.

The X-direction and Z-direction lengths of the one-side substrate portion 110 and the other-side substrate portion 120 are determined according to the width (X direction in FIG. 1) and height (Z direction in FIG. 1) of the bag 10 to be made. can be set appropriately.

Also, the length of the connection margin 130 in the Z direction may be of a length sufficient to form the bag 10, but as shown in the figure, it should be equal to the one-side base member 110 and the other-side base member 120. is preferred. The length of the connection margin 130 in the X direction may be of a length that can be fixed to the left end portion of the one-surface base member 110 in the X direction.

The one-side base material portion 110 and the other-side base material portion 120 are line-symmetrical with respect to the edge crease 40 . However, in the one-side substrate portion 110 and the other-side substrate portion 120, the folding directions of the parallel folds 20 and the bending folds 30, that is, the mountain folds and the valley folds are opposite.

In addition, the crease formed in the connection margin 130 is line-symmetrical to the crease formed in the other-side base material portion 120 with respect to the edge crease 40 . However, in the other side substrate portion 120 and the connecting margin 130, the folding directions of the parallel folds 20 and the bending folds 30, that is, the mountain folds and the valley folds are reversed.

Details of the one-sided base member 110 will be described below.

The one-side substrate portion 110 includes an opening edge forming portion 112 for forming the opening edge portion 12 (FIG. 1) of the bag 10 and a bottom forming portion 114 for forming the bottom portion 14 (FIG. 1) of the bag 10. , and a front forming portion 116 for forming the front portion 16 ( FIG. 1 ) of the bag 10 . In the one-side substrate portion 110, a bottom forming portion 114, a front forming portion 116, and an opening edge forming portion 112 are arranged in order from bottom to top in the Z direction.

At the front forming portion 116 , the parallel folds 20 extend in the Z direction and the bending folds 30 intersect the parallel folds 20 . Parallel folds 20 extend straight to opening edge formation 112 and bottom formation 114, respectively.

The opening edge forming portion 112 extends upward from the upper end of the front forming portion 116 in the Z direction. A folding line 112X set in the opening edge forming portion 112 forms an opening 12E (FIG. 1) in the bag 10. As shown in FIG. Therefore, the parallel folds 20 in the opening edge forming portion 112 are line-symmetrical with respect to the folding line 112X. However, the folding direction of the parallel folding line 20 in the opening edge forming portion 112 (whether it is the mountain folding line YM or the valley folding line TN) is opposite with respect to the folding line 112X.

The bottom forming portion 114 is folded back to block the opening on the lower side of the cylindrical body, and extends downward from the lower end of the front forming portion 116 in the Z direction. Folding line 114X, which is a boundary line between bottom forming portion 114 and front forming portion 116, extends in the X direction. The folding line 114X is the boundary line 14X (FIG. 1) between the front portion 16 and the bottom portion 14 of the bag 10. As shown in FIG. When the bag 10 is formed, the folding directions of the folding lines 114X, that is, the mountain folds and the valley folds, are opposite in the one-side base member 110 and the other-side base member 120 .

The bottom forming portion 114 is formed with a vertical fold line 114Z, a horizontal folding line 114R, an oblique mountain fold line 114N, and a slit 114SL.

The lateral fold line 114R is a mountain fold line YM extending in the X direction and forms part of the outline 14A (FIG. 1) of the bottom portion 14 of the bag 10. As shown in FIG.

The longitudinal crease 114Z is an extension of the parallel crease 20 of the front forming portion 116. As shown in FIG. Of the vertical folds 114Z, the Z-direction upper side of the horizontal folding line 114R is a fold opposite to the adjacent parallel folds 20. As shown in FIG. Of the same vertical fold line 114Z, the portion below the horizontal folding line 114R in the Z direction is a fold opposite to the portion above the horizontal folding line 114X in the Z direction.

The diagonal crease 114N starts from both ends (K1 and K2 in FIG. 3) of the folding line 114X in the X direction and extends diagonally toward the center in the X direction and downward in the Z direction. Extend. Here, the points K1 and K2 refer to the intersections of the edge crease 40 and the folding line 114X in the cylindrical body T (FIG. 6). An angle θ1 formed by the diagonal crease 114N and the Z direction is, for example, 45°. The terminal point of the oblique mountain crease 114N does not reach the Z-direction lower end portion 114E of the bottom forming portion 114, but is located in the middle of the bottom forming portion 114 in the Z direction.
In addition, when the bag 10 is formed, in the one-side base material portion 110 and the other-side base material portion 120, the diagonal mountain fold 114N is positioned outside the vertical fold 114Z in the X direction, and is positioned outside the vertical fold 114Z. preferably do not cross each other. When the bag 10 is formed, in the one-side substrate portion 110 and the other-side substrate portion 120, the oblique mountain fold 114N is the mountain fold YM.

The slit 114SL extends downward in the Z direction from the end point of the diagonal crease 114N to the bottom end 114E of the bottom forming portion 114 in the Z direction. The length L1 of the slit 114SL may be set based on the gist of the present invention.

Next, how to make the bag 10 will be described.

As shown in FIG. 4, the container manufacturing method 300 includes a printing step 310, a creasing step 320 of forming predetermined creases on the substrate 200 that has undergone the printing step 310, and a substrate that has undergone the creasing step 320. a slit forming step 330 for forming a slit in the substrate 200; an opening portion folding step 340 for folding back the opening edge forming portion 112 of the base material 200; a cylindrical body forming step 350 for forming a cylindrical body T from the base material 200; A flattening step 360 of flattening the cylindrical body T by two creases, and a bottom forming step 370 of closing an opening on one side of the cylindrical body T to form a bottom. Through the bottom forming step 360, the bag 10 is obtained.

In the printing process 310 , a predetermined design is printed on the base material 200 . The printing method is not particularly limited as long as it is a known method.

In the creasing step 320, a predetermined mold is pressed against the substrate 200 to form a predetermined crease (FIG. 3).
to form

In the slit forming step 330, the slit 114SL (FIG. 3) is formed in the base material 200. As shown in FIG.

In the opening portion folding step 340, the upper end portion of the opening edge forming portion 112 of the base material 200 (FIG. 3) is folded with reference to the folding line 112X (FIG. 5).

In the cylindrical body forming step 350, the base material 200 (FIG. 5) is folded back with reference to the edge crease 40 between the one-side base material part 110 and the other-side base material part 120, and the other-side base material It is folded back on the basis of the edge crease 40 between the portion 120 and the connection margin 130 . Furthermore, the overlapping portion of the connection allowance 130 and the one-surface base member 110 is fixed. Thereby, the tubular body T is formed from the base material 200 .

In the flattening step 360, the cylindrical body T is flattened by folding along the crease 40 (FIG. 6). At this time, the slit 114SL is positioned so as to extend from the open end of the cylindrical body T (FIG. 6).

In the bottom portion forming step 360, the cylindrical body T is folded with reference to the diagonal creases 114N of the one-side substrate portion 110 and the other-side substrate portion 120 (FIG. 7). Next, the cylindrical body T is folded along the horizontal folding line 114R of the one-sided base material portion 110 (FIG. 8). At this time, the end portion 114E of the bottom forming portion 114 on the folded back side is positioned below the folding line 114X in the Z direction. After that, the cylindrical body T is folded along the horizontal folding line 114R of the other side base material portion 120 (FIG. 9). At this time, the end portion 114E of the bottom forming portion 114 on the folded back side is positioned above the folding line 114X in the Z direction. In this way, the lower opening in the Z direction of the cylindrical body T is closed. The bottom portion of the bag 10 is formed by fixing the overlapping portions of the bottom forming portion 114 .

Next, how to use the bag 10 will be described.

The bag 10 in the state shown in FIG. 1 is alternately folded at the peak folds and the valley folds at the bending folds 30 (FIGS. 10(A) and 10(B)). The bag 10 of FIG. 10(B) is alternately folded in mountain folds and valley folds with reference to the parallel folds 20 . In this way, the bag 10 can be folded into a small size. Due to the creases provided in the bag 10, it can be easily folded at the parallel creases 20 and the bent creases 30 (Fig. 10), and when force is applied from the folded state, the bag 10 is smoothly unfolded at the parallel creases 20 and the bent creases 30. (Fig. 1). Further, even if the unfolding work and the folding work are repeatedly performed, the base material is not twisted. Therefore, unfolding work and folding work can be performed repeatedly.

In addition, in the unfolded state of the bag 10 (FIG. 1), the bag 10 (especially the front portion 16) tends to stand on its own due to the unique structure of the Miura fold.

In addition, when the bag 10 is expanded (FIG. 1), it is possible to store predetermined items. In this case, since the bag 10 is provided with the parallel folds 20 and the bent folds 30, the bulge due to the contents is likely to bend at the parallel folds 20 and the bent folds 30, while the bag 10 is surrounded by the parallel folds 20 and the bent folds 30. The parallelogram itself is hard to bend. As a result, the bag 10 bulges into a convex shape due to the content, but is bent at the parallel folds 20 and the bending folds 30 while maintaining the parallelogram surface. The form becomes a unique bulge with a predetermined convex shape, and it looks beautiful.

In the folded bag 10, the upper and lower surfaces are located at the opening edge 12 and the bottom 14, which are stronger than the other portions. Therefore, by holding the opening edge portion 12 and the bottom portion 14 of the folded bag 10 and spreading them away from each other, the bag 10 can be unfolded without causing unnecessary damage. Similarly, when folding the unfolded bag 10, it is sufficient to hold the opening edge 12 and the bottom 14 and fold it, so that the bag 10 can be unfolded without unnecessary damage.

Furthermore, when the bag 10 is unfolded, the part between the opening edge 12 and the bottom 14 is a conspicuous part, the so-called face of the bag 10 . The "face" portion is housed inside in the folded state. Therefore, during storage, the "face" portion is neither damaged nor soiled.

In addition, the height of the bag itself 10 can be reduced by manually folding the upper portion of the bag 10 to the bending crease 30 when storing a short object. It is then possible to accommodate taller objects by stretching the bending folds 30 .

In particular, when the bag 10 is made of paper or the like, it is lightweight and strong, and can be used repeatedly, which is friendly to the environment. Furthermore, even when discarded, it is decomposed in the natural world, so it is environmentally friendly.

Here, if the diagonal crease 114N overlaps with the edge crease 40 of the bottom portion 14, the other diagonal crease 114N, or the vertical crease 114Z, the overlapping portion becomes thick, making the next folding difficult. As a result, it becomes difficult to manufacture the bag 10, or the workability of unfolding and folding the manufactured bag 10 is lowered. In this embodiment, the slits 114SL are formed so that the diagonal crease 114N does not overlap the edge crease 40 of the bottom portion 14, the other diagonal creases 114N, and the vertical crease 114Z. Therefore, not only is the production of the bag 10 facilitated, but also the workability of unfolding and folding the bag 10 is improved.

It should be noted that the parallel folds 20 may extend in the X direction and the bending folds 30 may extend in the Z direction. The number of parallel folds 20 is not limited to two, and may be three or more. Further, the number of bending creases 30 is not limited to five, and may be two to four or less, or may be six or more.

Note that the handle structure is not limited to the insertion hole 12X positioned at one side of the bag 10 in the Y direction and at the center in the X direction, but is provided from the center in the X direction at one side of the bag 10 in the Y direction. A string may be used. Both ends of the string are attached to the bag 10 at a predetermined interval at the center in the X direction on one side of the bag 10 in the Y direction.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

10 Bag 12 Opening edge portion 12E Opening 12X Insertion hole 14 Bottom portion 14A Contour line 14X Boundary line 16 Front portion 20 Parallel crease 30 Bending crease 40 Edge crease 110 One side substrate portion 112 Opening edge forming portion 114 Bottom forming portion 114N Oblique Mountain crease 114R Lateral folding line 114SL Slit 114X Folding line 114Z Vertical crease 116 Front forming part 120 Other side base material part 130 Connection allowance 200 Base material 300 Container manufacturing method 310 Printing process 320 Folding process 330 Slit forming process 340 Opening folding step 350 Cylindrical body forming step 360 Flattening step 370 Bottom forming step

Claims (9)

a bag;
a plurality of parallel folds provided in the bag;
a plurality of bending creases provided in the bag,
The bending crease extends straight in the direction intersecting the parallel crease between the parallel creases and is bent at the intersection position with the parallel crease,
When the bending fold is a valley fold,
The parallel folds that intersect the bending folds at an obtuse angle are valley folds,
The parallel crease that intersects the bending crease at an acute angle is a mountain crease,
The bag portion can be folded and unfolded at the parallel folds and the bent folds ,
The bag portion is a tubular body folded at two edge creases parallel to the parallel creases,
A bottom forming portion that forms the bottom of the tubular body,
The bottom forming portion is provided at the edge of the cylindrical body on the first opening side and is folded back along a folding line to form the bottom,
An oblique crease extending obliquely from the edge crease toward the first opening of the cylindrical body is formed in the bottom forming portion,
The bottom of the tubular body is formed by folding the tubular body at the diagonal folds,
The bottom forming portion is formed with a vertical fold that is an extension of the parallel fold and a horizontal folding line perpendicular to the vertical fold,
The diagonal fold does not intersect the vertical fold,
The accommodation structure is characterized in that the vertical fold line does not change even if the fold line is crossed over, but the fold line changes across the horizontal fold line . A slit extending from the first opening of the cylindrical body is formed in the bottom forming portion,
2. The housing structure according to claim 1 , wherein said slit is formed so that said oblique crease does not cross said vertical crease. 3. A containment structure according to claim 1 or 2 , wherein at least two said diagonal folds do not cross each other. A slit extending from the first opening of the cylindrical body is formed in the bottom forming portion,
4. The housing structure according to claim 3 , wherein said slit is formed so that at least two said oblique creases do not cross each other. 5. The housing structure according to any one of claims 1 to 4 , wherein said oblique crease does not intersect said edge crease. A slit extending from the first opening of the cylindrical body is formed in the bottom forming portion,
6. The housing structure according to claim 5 , wherein the slit is formed so that the oblique crease does not intersect the edge crease. The oblique crease extends toward the first opening of the tubular body,
7. The housing structure according to any one of claims 2 , 4 and 6, wherein said slit extends from the end of said diagonal fold to said first opening of said cylindrical body. a sheet on which a front portion serving as the front surface of the bag and a bottom forming portion serving as the bottom portion of the bag are set;
a plurality of parallel folds provided on the front portion;
a plurality of bending creases provided in the front portion,
The bending crease extends straight in the direction intersecting the parallel crease between the parallel creases and is bent at the intersection position with the parallel crease,
When the bending fold is a valley fold,
The parallel folds that intersect the bending folds at an obtuse angle are valley folds,
The parallel crease that intersects the bending crease at an acute angle is a mountain crease,
The front portion is defined by two edge creases,
An oblique crease extending obliquely toward the bottom forming portion is formed starting from the boundary between the front portion and the bottom forming portion,
A slit extending from an end of the bottom forming portion is formed in the bottom forming portion,
A terminal end of the oblique fold is located in the slit,
The bottom forming portion forms the bottom by being folded back along a folding line at the boundary with the front portion,
The bottom forming portion is formed with a vertical fold that is an extension of the parallel fold and a horizontal folding line perpendicular to the vertical fold,
The diagonal fold does not intersect the vertical fold,
A forming sheet for a housing structure , wherein the vertical fold line does not change even if the fold line is crossed over, but the fold line changes across the horizontal fold line . a creasing step of making a predetermined creasing on a base material having a front portion serving as the front surface of the cylindrical body and a bottom forming portion serving as the bottom portion of the cylindrical body;
A slit forming step of forming a slit in the substrate that has undergone the creasing step;
a cylindrical body forming step of forming the cylindrical body from the base material;
a flattening step of flattening the tubular body by folding the tubular body along the edge creases parallel to the axial direction of the tubular body;
a bottom portion forming step of forming a bottom by closing the opening of the tubular body by folding back at the oblique creases set in the bottom forming portion of the tubular body that has undergone the flattening step;
An oblique crease extending obliquely toward the bottom forming portion is formed starting from the boundary between the front portion and the bottom forming portion,
the slit extends from an end of the bottom formation;
A terminal end of the oblique fold is located in the slit,
The bottom forming portion forms the bottom by being folded back along a folding line at the boundary with the bottom forming portion,
The bottom forming portion is formed with a vertical fold that is an extension of the parallel fold and a horizontal folding line perpendicular to the vertical fold,
The diagonal fold does not intersect the vertical fold,
A method for manufacturing an accommodation structure , wherein the vertical fold line does not change even when the fold line is crossed, but the fold line changes when the fold line is crossed over the horizontal fold line .

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