CN113423303B - Folding bag and manufacturing method thereof - Google Patents

Abstract

The invention provides a folding bag. A folding bag (A) is provided with: a handle opening (D) formed along a pair of short sides (3) of a rectangular sheet material (1); folding ends (6) which are formed on both sides by folding over each other at equal intervals (S2) from the symmetry axis (CL) in such a manner that the perpendicular bisector of the long side (2) of the sheet material (1) is the symmetry axis (CL) and the opposing handle opening parts (D) are in contact with or close to the symmetry axis (CL); a storage section (B) formed by winding the folded end (6) from both sides toward the handle opening section (D) while forming a plurality of winding lines (RL); and a bundling end part (C) formed by closing both longitudinal direction side parts of the rolled-in containing part (B) in an overlapped state, wherein the containing part (B) can be rolled and folded into a rectangular flat shape by tensioning the bundling end part (C) in a pulling direction from a using state.

Description

Foldable bag and method for making the same

technical field

The present invention relates to an easy-to-carry foldable bag, and more particularly to a foldable bag capable of being folded into a rectangular flat shape only by pulling both side parts in the direction of opening from a use state, and a method for manufacturing the foldable bag .

Background technique

Various proposals have been made so far for foldable bags made of sheet materials and foldable to make them smaller in consideration of carrying them when not in use.

As an example of such a bag, there is currently known a foldable enclosure: it is made of a sheet material, and after use, only by pulling both ends in the direction of pulling apart, it can form a foldable enclosure in the longitudinal direction. In the form of a predetermined rectangular flat strip with both ends closed, the enclosure is composed of an opening and a corrugated enclosure main body, and the opening makes the central portion or one side of the enclosure in a strip-shaped form in the width direction The edge extends from one end to the other end in a straight line, and is used to pick and place the object; the enclosure main body is located on one half and the other half of the opening through the opening, and is repeated by passing through it with a specified width. A plurality of folds formed by mountain folds and valley folds (refer to Patent Document 1).

In addition, there is also known a belt having a small expandable single pocket-like bag with a fabric that expands asymmetrically according to the contents and pleats that use the pleats when the bag is empty. The pleats fold the fabric into an overlapping shape and secure it relative to the strap, which sits snugly on the wearer's body during use, securely holding small objects, and additionally, the strap has the ability to expand to hold larger objects bag (refer to Patent Document 2).

prior art literature

patent documents

Patent Document 1: International Publication No. 2017/033902 Handbook

Patent Document 2: Japanese PCT Publication No. 2010-517724

Contents of the invention

The problem to be solved by the invention

In the foldable enclosure described in Patent Document 1, after use, only by pulling the two ends in the direction of opening can form the form in which the two ends in the longitudinal direction are closed, but when making the corrugated structure When enclosing the main body of the enclosure, it is necessary to perform hot pressing so that the wrinkles do not disappear, and there is a problem that manufacturing a foldable enclosure requires cost.

In addition, in the belt with the bag body described in the above-mentioned Patent Document 2, although it is not necessary to heat-press the wrinkles when making the bag body, as a material for making the bag body, it is necessary to prepare a belt that crosses the direction of the belt. The woven fabric having stretchability in one direction has the same problem as in the above-mentioned Patent Document 1 that it requires cost to manufacture a belt having pockets.

The object of the present invention is to solve the above problems, and its purpose is to provide a foldable bag and a method of making the foldable bag. The foldable bag is rolled in a rectangular sheet material from the folded end without using heat press. Made, and can be rolled into a rectangular flat shape just by pulling the two side parts in the direction of pulling apart from the use state.

solutions to problems

In order to solve the above-mentioned problems, the present invention adopts the following structure as a foldable bag: a foldable bag that can be rolled into a rectangular flat shape, and is provided with: a handle opening portion along a pair of short sides of a rectangular sheet material. Forming; the folded end, which takes the vertical bisector of the long side of the sheet material as the axis of symmetry, with the opposite opening of the handle abutting or approaching on the axis of symmetry, from the axis of symmetry Folding each other at equal intervals and forming on both sides; a receiving portion formed by rolling the folded end from both sides toward the handle opening while forming a plurality of folding lines; and a bundled end portion forming The two side parts in the longitudinal direction of the rolled-in storage part are closed in a state of being overlapped, and the storage part is rolled up and folded by pulling the bundled end part in the pulling direction from the use state. .

Furthermore, as an embodiment of the foldable bag, the handle opening has a standing portion formed by bending from the pair of short sides in parallel at a predetermined interval, and the handle opening has a There is a structure in which the handle portion is formed along the pair of short sides, and the structure in which the handle portion has a through-opening portion formed close to the pair of short sides is adopted, and the storage portion has a The structure of the inner pocket formed in parallel with the handle opening.

In addition, as a method of manufacturing a foldable bag, a structure is adopted in which the foldable bag is rolled up and folded into a rectangular flat shape by pulling both side parts in the direction of opening from the state of use, and the foldable bag is The manufacturing method includes: a step of unfolding a rectangular sheet material composed of a long side and a short side; a step of forming a handle opening along a pair of short sides of the sheet material; The vertical bisector of the handle is the axis of symmetry, in such a way that the opposite openings of the handle abut against or approach the axis of symmetry, they are folded upwards at equal intervals from the axis of symmetry, forming a The process of folding the ends parallel to the short sides; the process of rolling the folded ends from both sides toward the handle opening while forming a plurality of fold lines to form the storage part; and the length of the rolled storage part The process of closing both sides of the direction to form a bundled end.

Furthermore, as an embodiment of the method of manufacturing a foldable bag, the step of forming the handle opening includes a step of bending downward from the pair of short sides in parallel at an interval required for forming the rising portion. , In addition, the process of forming the handle opening includes the process of forming the handle portion along the pair of short sides, and in addition, the process of forming the handle portion includes the process of forming the handle portion near the pair of short sides In the configuration of the step of forming the through opening, the step of forming the storage portion includes the step of forming the inner pocket parallel to the handle opening.

Invention effect

The foldable bag of the present invention adopts the above-mentioned structure, prepares a rectangular sheet-like material, and rolls it in order from the folded ends formed on the left and right around the axis of symmetry, so that it can be produced without performing pleating using heat press. , and when carrying, the storage part can be rolled up and folded only by pulling the bundled end part in the direction of pulling out from the use state.

In addition, the manufacturing method of the foldable bag according to the present invention adopts the above-mentioned structure, unfolding a sheet of rectangular sheet material, centering on the axis of symmetry, and rolling it in order from the folded ends formed on the left and right toward the opening of the handle, thereby It is folded and manufactured without using heat press, so the manufacturing process of the foldable bag can be simplified.

Description of drawings

1 is a view showing a folded state of a foldable bag according to a first example of an embodiment of the present invention, (a) is a front view, and (b) is a schematic cross-sectional view taken along the X1-X1 direction of (a).

Fig. 2 is a plan view showing an unfolded state of a sheet material of the foldable bag according to the first example of the manufacturing embodiment.

Fig. 3 is a perspective view showing a step of folding the sheet material of Fig. 2 .

4 is a diagram showing a state in which the sheet material folded according to the process of FIG. 3 is wound in, (a) is a perspective view showing a state of being wound in twice, and (b) is a perspective view showing a state of being wound in three times.

5 is a perspective view showing the finishing process of the foldable bag according to the first example of the embodiment, (a) is a perspective view showing a state where side ends are sewn, and (b) is a view showing a tape is sewn on a side end; Perspective view of the state of the material.

Fig. 6 is a perspective view showing a use state in which the foldable bag of the first example according to the embodiment is unfolded.

Fig. 7 is an explanatory diagram showing the procedure for folding the foldable bag of the first example according to the embodiment, (a) is a diagram showing a state where the bundled ends of both ends are stretched in the direction of pulling apart, (b) It is a figure which shows the state which rolled up the storage part folded in half in the longitudinal direction.

Fig. 8 is a plan view showing an unfolded state of a sheet material of a foldable bag according to a second example of the manufacturing embodiment.

Fig. 9 is a plan view showing an unfolded state of a sheet material of a foldable bag according to a third example of the production embodiment.

Fig. 10 is a diagram showing a foldable bag according to a third example of the embodiment, wherein (a) is a front view showing a folded state, and (b) is a perspective view showing an unfolded use state.

11 is a view showing a folded state of a foldable bag according to a fourth example of the embodiment, (a) is a front view, and (b) is a schematic cross-sectional view taken along the X2-X2 direction of (a).

Fig. 12 is a plan view showing an unfolded state of a sheet material of a foldable bag according to a fourth example of the production embodiment.

Fig. 13 is a perspective view showing a step of folding the sheet material of Fig. 12 .

Detailed ways

Next, the folding bag and the manufacturing method of the folding bag according to the embodiment of the present invention will be described with reference to the drawings.

In the following description, when viewed from the front view of FIG. 1( a ), the vertical direction is defined as "up and down", the horizontal direction is defined as "left and right", and the direction from the front to the depth of the page is defined as "front and rear".

Example 1

In Fig. 1, A is a folding bag in a folded state, B is a storage part folded into a rectangular flat shape, and C is a bundled end in which both sides in the longitudinal direction of the storage part B are overlapped and closed. D is a handle opening provided on the innermost side of the storage part B to take and place stored items, and E is a binding part for bundling when the storage part B is slightly folded in the longitudinal direction.

As shown in Figure 2, the storage portion B and the handle opening D are composed of a rectangular sheet material 1, which is composed of a long side 2 and a short side 3, in this embodiment, as a sheet The material of the material 1 is a non-elastic fabric (fabric) using polyester, but any fabric made of synthetic fibers such as nylon or cotton or natural fibers, a laminated material coated with a synthetic resin on the fabric, etc. A flexible sheet material having desired strength and bendability can be selected arbitrarily.

The unfolded sheet material 1 is bent downward (mountain fold) at the mountain fold line ML which is parallel to the pair of short sides 3 and separated by a predetermined interval S1 required to form the raised portion f, to form handle openings D respectively. .

In this embodiment, at the handle opening D, V-shaped cutting parts 4 are respectively formed from the short side 3 toward the inside, and on the side of the short side 3 of the cutting part 4, a width ratio The handle portion 5 made of a tape material with the small interval S1. However, the handle opening D only needs to be bent from the short side 3 of the sheet material 1 in parallel at a required interval S1 to form the raised portion f, and it is not necessary to sew materials other than the sheet material 1 as in this embodiment. Alternatively, as shown in the second embodiment described later, the handle portion may be formed by performing required processing on the portion of the sheet material 1 where the handle opening D is formed.

Next, in order to form the storage portion B line-symmetrically across the symmetry axis CL that is the vertical bisector of the long side 2 of the sheet material 1, the upright portion f of the handle opening D after mountain folding is on the symmetry axis CL. In the way of facing each other, fold (valley fold) in the direction of the arrow (upper) at the fold line FL at the same interval S2 from the symmetry axis CL and the mountain fold line ML, as shown in Figure 3, on both sides of the sheet material 1 A folded end 6 is formed parallel to the axis of symmetry CL. At this time, it is preferable that the handle openings D facing each other on the axis of symmetry CL are in contact with each other, but they may be only close to each other.

Next, the sheet material 1 formed with the folded end 6 is directed toward the handle opening D from both sides as indicated by the arrow shown in FIG. The fold line RL2 is drawn in sequentially.

In this embodiment, on the sheet material 1 on which the folded end 6 is formed, the first fold line RL1 with the winding width R1 from the folded end 6 and the roll width from the first fold line RL1 are formed. For the second winding line RL2 which is R2 and has a winding width R3 from the mountain folding line ML, each winding width is set to gradually increase so that the relationship of R1<R2<R3 is satisfied.

Here, the step of rolling in the sheet material 1 formed with the folded end 6 will be described. From the state shown in FIG. 3 , as shown by the arrow shown in FIG. 6 When winding in order from both sides along the first folding line RL1 and the second folding line RL2, it is wound so that each winding width becomes R3 with the axis of symmetry CL as a boundary.

Furthermore, when the sheet material 1 rolled into the state shown in FIG. 4( a) is bent upward from both sides along the mountain fold line ML, as shown in FIG. The storage part B is folded in the state of the opening part D. At this time, the folded storage portion B has a bottom surface 7 formed along the axis of symmetry CL, a pair of folded upper sides 8 formed along the second fold line RL2, and side ends formed on both sides in the longitudinal direction in an overlapping state. Section 9 constitutes a rectangular flat shape.

In this embodiment, in order to form the storage portion B, the folded end 6 formed on the sheet material 1 is formed along the first fold line RL1, the second fold line RL2 and the mountain The folding line ML is wound three times, but the number of windings of the sheet material 1 may be increased or decreased according to the size of the foldable bag A.

Next, the storage portion B folded into the state shown in FIG. 4(b) is sewed as shown in FIG. One end of a ring-shaped rubber binding part E is sewn to the side end part 9 in order to fold and bind the storage part B in the longitudinal direction from the vicinity of the center toward the outside.

In the present embodiment, as the binding part E, an annular rubber binding part is used, but the binding part E is not limited to this type, for example, it may be formed on a belt-shaped belt extending from the side end part 9. A button is attached to the end portion, and a receiving portion cooperating with the button is installed on the surface of the storage portion B.

As shown in FIG. 5( b), the bundled end portion C is made up of a pair of strip-shaped materials 11 having an overall length set to be more than twice the width of the folded storage portion B, that is, the winding width R3. Closing is performed with the side ends 9 of the storage part B overlapped, and each strip material 11 is folded from the crease 12 and sewn so as to sandwich the folded side ends 9 of the storage part B.

As described above, since the foldable bag A is produced in a folded state, the appearance of the foldable bag A in use will be described with reference to FIG. 6 .

The foldable bag A that is unfolded into the use state has a form like a shoulder bag as a whole, and has a bottom surface 7 of about twice the width of the winding width R3 (between the axis of symmetry CL and the folded upper edge 8 ), and front and back from the bottom surface 7. The upright front and rear folded ends 6 are a main body 13 in the middle line, and a top gusset 14 in which a cutout 4 is formed continuously from the main body 13 to the handle opening D to which the upper handle 5 is connected. .

Next, the usage and effects of this embodiment will be described with reference to the drawings.

As described above, the foldable bag A of the present embodiment is produced in a folded state as shown in FIG. 1 by rolling the rectangular unfolded sheet material 1 shown in FIG. 2 . A will be explained in the order in which they can be used.

First, the binding part E is untied from the storage part B bound by the rubber binding part E, and unfolded in the left and right direction with the bottom surface 7 facing down as shown in Figure 1 (a), at this time, the storage part B As shown in the schematic cross-sectional view of FIG. 1( b ), the bottom surface 7 is in a closed state, whereas the folded upper edge 8 is in a state that can be separated back and forth.

Then, when the folded upper edge 8 is opened forward and backward, the handle portion 5 sewn to the handle opening portion D is lifted upward from the storage portion B, and when the bottom surface 7 is pulled downward, as shown in FIG. 6 , the foldable bag A Since it is in a usable state, after storing items through the handle opening D, the handle 5 can be held by hand or worn on the shoulder for use. At this time, since the bundled end portion C of the foldable bag A is hidden by the main body portion 13 such as the folded upper side 8, the outer shape of the bag can be kept clean.

Next, with reference to FIG. 7, the procedure for folding the used foldable bag A to be smaller will be described. From the state shown in FIG. Hold the bundled ends C on both sides of the storage part B with both hands, as shown in Figure 7(a), pull the bundled ends C on both sides in the direction of pulling apart (arrow direction) with both hands, if you cannot When fully folded once, the storage portion B can be folded into a rectangular flat shape by re-pulling the bundled end portion C in the direction of the arrow again.

Then, as shown in Figure 7(b), after folding the receiving part B in half at the crease 15 in the longitudinal direction, it is folded from the crease 15 in such a way that it becomes smaller, and finally, it is bundled with a rubber binding part E. The folding of bag A is completed.

As described above, the foldable bag A of this embodiment prepares a sheet of rectangular sheet material 1 and rolls it in order from the folded ends 6 formed on the left and right around the axis of symmetry CL, so that pleats using heat pressing are not required. Make storage part B easily.

Example 2

Next, a description will be given of a second embodiment in which the configuration of the handle portion 5 in the first embodiment is changed.

Hereinafter, the same reference numerals are attached to the same components as those of the first embodiment, and only different components are given different reference numerals, and the differences will be mainly described.

In FIG. 8 , 21 is a rectangular sheet-like material composed of a long side 22 and a short side 23 , and constitutes the storage portion B and the handle opening D of the foldable bag A shown in FIG. 1 . The sheet material 21 is compared with the sheet material 1 of the first embodiment, and the size of the short side 23 is the same as the sheet material 1, but the size of the long side 22 is longer than the long side 2 of the sheet material 1. fixed interval S3.

The unfolded sheet material 21 is respectively formed with semi-elliptical through openings 24 adjacent to the pair of short sides 23 . The sheet material 21 is valley folded at the valley fold line VL parallel to the short side 23 and separated by a predetermined interval S3, thereby aligning the short side 23 with the coincident line OL that meets the straight portion of the through opening 24. Two pieces are overlapped and sewn to form a handle portion 25 . In the present embodiment, the through opening portion 24 is reinforced by sewing a reinforcement tape 26 around it.

Next, the usage and effects of this embodiment will be described with reference to the drawings.

In this embodiment, the rectangular sheet-like material 21 shown in FIG. The handle portion 25 of the handle opening portion D is different from the handle portion 5 of the first embodiment, so it will be described.

In this embodiment, as described above, the rectangular unfolded sheet material 21 shown in FIG. The valley fold is performed at the valley fold line VL, so that the short side 23 is aligned with the coincident line OL, and the two pieces are overlapped for sewing to form the handle portion 25 .

After the handle portion 25 is formed, the sheet material 21 is bent downward at the mountain fold line ML parallel to the pair of short sides 23 and separated by a predetermined interval S1, thereby matching the handle opening portion shown in FIG. D similarly forms rising portions f, respectively. Thereafter, the foldable bag A is produced through the same process as that of the first embodiment shown in FIGS. 3 to 5 .

As described above, in this embodiment, only by preparing a sheet of rectangular sheet material 21, forming the through opening 24 on each short side 23 side of the sheet material 21 and overlapping the two sheets for sewing, it is possible The handle portion 25 is formed at a portion that becomes the handle opening D. As shown in FIG.

Example 3

Next, a description will be given of a third embodiment in which the configurations of the storage portion B and the binding portion E in the first embodiment are changed.

Hereinafter, the same reference numerals are attached to the same components as those of the first embodiment, and only different components are given different reference numerals, and the differences will be mainly described.

In Fig. 10(a), Aa is a folding bag in a folded state, Ba is a storage part folded into a rectangular flat shape, and C is a closed state in which both sides in the longitudinal direction of the storage part Ba are overlapped. D is the handle opening (refer to FIG. 10(b)) provided on the innermost side of the storage part Ba to take and place the storage items 29 (refer to FIG. 10(b)), and Ea is to fold the storage part Ba along the longitudinal direction Binding section for bundling in a reduced state. In addition, in this embodiment, the binding part Ea is different from the first embodiment in that it is provided on the storage part Ba side of the bundled end part C, but the binding part Ea can be used as long as the storage part B shown in FIG. It can be installed in any position by bundling the storage part Ba in a state of being folded in the longitudinal direction.

In FIG. 9 , 1 is a rectangular sheet-like material composed of a long side 2 and a short side 3 , constituting the storage portion Ba and the handle opening D of the foldable bag Aa shown in FIG. 10 . In this embodiment, at the handle opening D, V-shaped cutouts 4 are respectively formed from the short side 3 toward the inside, and on the side of the short side 3 of the cutout 4, a slit with a width smaller than the interval S1 is sewn. Handle portion 5 made of tape material.

An inner pocket P is formed on the unfolded sheet material 1 by sewing at the seam 28 so that the front end of the cut portion 4 is in contact with the upper end of the additional sheet material 27 . In this embodiment, in order to form the inner pocket P, an additional sheet material 27 whose lateral dimension is the same as the short side 3 and whose longitudinal dimension is greater than the depth d of the inner pocket P by a sewing allowance is used, but the additional sheet forming the inner pocket P The size of the shape material 27 can be appropriately selected according to the width w and depth d of the inner pocket P required.

Next, the usage and effects of this embodiment will be described with reference to the drawings.

In the present embodiment, the rectangular unfolded sheet material 1 shown in FIG. 9 is rolled up in the same manner as in the first embodiment, thereby making the foldable bag Aa shown in FIG. 10( a) in a folded state, but The point that the inner pocket P is formed inside the storage part Ba is different from the storage part B of the first embodiment, so it will be described.

In the present embodiment, as shown in FIG. 9 , the additional sheet material 27 is disposed after the upper end meets the front end of the cut portion 4 formed in the rectangular unfolded sheet material 1 , and the additional sheet material 27 is placed at the stitch 28. The sheet material 27 is sewn to the sheet material 1 to form an inner pocket P inside the storage portion Ba. At this time, the width w of the inner pocket P can be appropriately set by changing the position of the sewing stitch 28 .

After forming the inner pocket P, the sheet material 1 is bent downward at the mountain fold line ML parallel to the pair of short sides 3 and separated by a predetermined interval S1, similar to the handle opening D shown in FIG. 3 . To form the raised portion f respectively. Thereafter, the foldable bag Aa is manufactured through the same process as that of the first embodiment shown in FIGS. 3 to 5 .

Since the foldable bag Aa is produced in a folded state, the appearance of the foldable bag Aa in use will be described with reference to FIG. Storage items 29 are stored inside storage portion Ba, and drink bottles 30 etc. are stored in a position separated from storage items 29 in a state where they are placed on a hammock in inner pocket P formed inside storage portion Ba.

As described above, in this embodiment, the additional sheet material 27 is sewn on the rectangular sheet material 1 constituting the storage portion Ba and the handle opening D of the foldable bag Aa, and is formed inside the storage portion Ba. The inner pocket P is thus different from the storage items 29 such as lunch boxes stored at the bottom of the storage part Ba, and the beverage bottle 30 and the like can be stored in the inner pocket P in a separated state, and the hot storage items 29 and the cold bottle 30 Can not contact, in addition, also needn't worry that bottle 30 crushes storage item 29.

Example 4

Next, a description will be given of a fourth embodiment in which the structure of the handle opening D in the first embodiment is changed.

Hereinafter, the same reference numerals are attached to the same components as those of the first embodiment, and only different components are given different reference numerals, and the differences will be mainly described.

In Fig. 11, Ab is a folding bag in a folded state, Bb is a storage part folded into a rectangular flat shape, and C is a bundled end in which both sides of the storage part Bb in the longitudinal direction are overlapped and closed. part, Da is the handle opening provided on the innermost side of the storage part Bb for taking and placing the stored articles, Ea is the binding part for bundling the storage part Bb in the state of folding and shrinking the storage part Bb in the longitudinal direction, 35 is a handle portion formed in the handle opening Da.

As shown in Figure 12, the storage portion Bb and the handle opening Da are made of a rectangular sheet material 31, the sheet material 31 is composed of a long side 32 and a short side 33, the sheet material 31 is the same as that of the first embodiment Compared with the sheet material 1, the size of the short side 33 is the same as that of the sheet material 1, but the size of the long side 32 is longer than the long side 2 of the sheet material 1 and set respectively in the left-right direction shown in Figure 13 The approximate dimension of the winding width R0.

The unfolded sheet material 31 forms the accommodating portion Bb line-symmetrically across the axis of symmetry CL that is the vertical bisector of the long side 32, and the handle opening Da formed along the pair of short sides 33 on the axis of symmetry CL. In the manner of facing each other, fold (valley fold) in the direction of the arrow (upper) at the fold line Fla at the same interval S4 from the symmetry axis CL and the short side 33, as shown in FIG. The sides form folded ends 36 parallel to the axis of symmetry CL. At this time, it is desirable that the handle openings Da facing each other on the axis of symmetry CL are as close as possible to each other.

Next, at the handle opening Da facing each other on the axis of symmetry CL, the handle portion 35 made of a tape material is sewn so as to connect the central portions of the short sides 33 . Then, the sheet material 31 formed with the folded end 36 is directed toward the handle opening Da from both sides as indicated by the arrow shown in FIG. The fold line RL2 and the third roll line RL3 are drawn in sequentially.

In this embodiment, on the sheet material 31 on which the folded end 36 is formed, a first fold line RL1 with a winding width R0 from the folded end 36 and a roll width R0 from the first fold line RL1 are formed. is the second folding line RL2 of R1, and the third folding line RL3 whose winding width from the second folding line RL2 is R2 and the winding width from the short side 33 is R3, and each winding width satisfies R0< The form of the relationship of R1<R2<R3 is set to gradually increase.

From the state shown in FIG. 13, as shown by the arrow, when the folded end 36 formed on the sheet material 31 is sequentially rolled in from both sides along the first fold line RL1, the second fold line RL2, and the third fold line RL3, The axis of symmetry CL serves as a boundary, and is wound so that each winding width becomes R3. The sheet material 31 rolled up through the above steps forms a storage portion Bb folded with the handle opening Da hidden in the inner bottom as shown in a schematic cross-sectional view in FIG. 11( b ). At this time, as shown in FIG. 11(a), the folded storage portion Bb has a bottom surface 37 formed along the axis of symmetry CL, a pair of folded upper sides 38 formed along the third fold line RL3, and a pair of folded upper sides 38 formed in an overlapping state. It is a rectangular flat shape formed by the bundled ends C on both sides in the longitudinal direction.

In this embodiment, in order to form the storage portion Bb, the folded end 36 formed on the sheet material 31 is formed along the first fold line RL1, the second fold line RL2, and the third fold line RL3 as shown in FIG. 11(b). The winding is performed three times, but the winding step of the sheet material 31 may increase or decrease the number of windings according to the size of the foldable bag Ab.

Next, the usage and effects of this embodiment will be described with reference to the drawings.

The foldable bag Ab of this embodiment folds and rolls the rectangular unfolded sheet-like material 31 shown in FIG. Therefore, as shown in FIG. 11 , it is made in a folded state, but the handle opening Da and the handle portion 35 are different from the handle opening D and the handle portion 5 of the first embodiment. The order in which the foldable bag Ab is set to a usable state will be described.

First, untie the binding portion Ea from the storage portion Bb bound by the binding portion Ea in the same manner as in the first embodiment, and expand to the left and right with the bottom surface 37 facing downward as shown in FIG. The accommodating portion Bb is in a state in which the bottom surface 37 is closed as shown in a schematic cross-sectional view in FIG.

Then, when the folded upper edge 38 is opened back and forth, the handle portion 35 sewn to the handle opening Da of the storage portion Bb is lifted upwards, and when the bottom surface 37 is pulled down, the foldable bag Ab becomes usable. Therefore, after storing items through the handle opening Da, the handle portion 35 can be held by hand, or worn on the shoulder for use.

Next, the procedure for folding the foldable bag Ab after use will be described. From the use state, the handle opening Da of the foldable bag Ab is fully opened, and after taking out the storage items, hold the two handles provided in the storage portion Bb with both hands. For the bundled ends C on the side, use both hands to tighten the bundled ends C on both sides in the direction of pulling, thereby neatly wrapping the storage part Bb, as shown in Figure 11(a), the storage part Bb can be folded into a rectangle flat shape.

As described above, the foldable bag Ab of the present embodiment prepares a rectangular sheet material 31, and makes the handle openings Da formed along the pair of short sides 33 face each other, with the axis of symmetry CL as the The center is rolled in order from the folded ends 36 formed on the left and right, so that the raised portion f is not formed in the handle opening Da. Therefore, after use, the two sides of the accommodating portion Bb are folded with both hands. The bundled end portion C of the folded portion is pulled in the pulling direction, and the storage portion Bb becomes easier to be drawn in than the first embodiment in which the raised portion f is formed, and can be folded neatly at one time. In addition, the foldable bag Ab of this embodiment is formed with handles 35 in such a manner that the handle openings Da facing each other on the axis of symmetry CL are connected. , the handle opening Da folded to the inner bottom of the storage portion Bb can be easily unfolded.

Industrial availability

The foldable bag of the present invention hides the bundled ends by the main body as the appearance in use, so that the appearance of the bag can be kept clean, and the foldable bag can be folded only by pulling the bundled ends in the opening direction from the state of use. The storage part is rolled up and folded into a rectangular flat shape, so it can be easily folded when carrying, and is especially suitable as an eco bag for storing purchased products when shopping.

Explanation of reference signs

A, Aa, Ab: folding bag

B, Ba, Bb: storage part

C: Cluster end

D, Da: handle opening

E, Ea: Binding Department

CL: axis of symmetry (centerline)

FL, FLa: folding line

ML: Mountain Polyline

OL: coincident line

P: inner pocket

RL1, RL2, RL3: Rolled lines

R0, R1, R2, R3: winding width

S1, S2, S3, S4: Intervals

VL: Valley Polyline

d: depth

f: standing part

w: width

1, 21, 31: sheet material

2, 22, 32: long side

3, 23, 33: short side

4: Cutting Department

5, 25, 35: Handle

6, 36: folding end

7, 37: bottom surface

8, 38: Fold the top

9: Side end

10, 28: Stitches

11: Ribbon material

12, 15: crease

13: Main body

14: Top gusset

24: Through opening

26: Reinforcing belt

27: Additional sheet material

29: Storage Items

30: bottle

Claims (14)

1. A foldable bag that can be rolled into a rectangular flat shape, having: a handle opening formed along a pair of short sides of a rectangular sheet material composed of a long side and a short side; The folded end, which takes the vertical bisector of the long side of the sheet material as the axis of symmetry, and the openings of the handles abut or approach each other in a manner facing each other on the axis of symmetry, at a distance from the axis of symmetry Folding lines equally spaced from the opening of the handle are folded upwards and formed on both sides, and the folded end is parallel to the axis of symmetry; The storage part is formed by wrapping the folded end toward the handle opening from both sides so that the winding width gradually increases while forming a plurality of folding lines, and the handle opening is provided in the the innermost way to form; and The bundling end part is formed by closing the two side parts in the longitudinal direction of the rolled-in storage part in a state of being overlapped, The accommodating part is rolled up and folded by pulling the bundling end part in a pulling direction from the state of use. 2. The collapsible bag of claim 1, wherein: The opening of the handle has a rising portion formed by bending downward at a mountain fold line parallel to the pair of short sides and separated by a predetermined interval, The folded ends are folded at fold lines equidistant from the axis of symmetry and the opening of the handle in such a manner that the raised portions face each other on the axis of symmetry. 3. The collapsible bag of claim 1, wherein: The handle opening has a handle formed along the pair of short sides. 4. The collapsible bag of claim 2, wherein: The handle opening has a handle formed along the pair of short sides. 5. The collapsible bag of claim 3, wherein: The handle portion has a through-opening portion formed adjacent to the pair of short sides. 6. The collapsible bag of claim 4, wherein: The handle portion has a through-opening portion formed adjacent to the pair of short sides. 7. A collapsible bag according to any one of claims 1 to 6, wherein The storage portion has an inner pocket formed parallel to the handle opening. 8. A method for making a foldable bag, by pulling the two sides in the direction of opening from the state of use, rolling in and folding the foldable bag into a rectangular flat shape, the method for making the foldable bag includes : The process of unfolding a rectangular sheet material formed by long and short sides; a process of forming a handle opening along a pair of short sides of the sheet material; Taking the vertical bisector of the long side of the sheet material as the axis of symmetry, the openings of the handles abut or approach each other in a manner facing each other on the axis of symmetry. The process of folding upwards at the equally spaced folding lines of the hand opening to form folded ends parallel to the axis of symmetry on both sides; The folded end is rolled in from both sides toward the handle opening while forming a plurality of folding lines so that the winding width gradually becomes larger, and the handle opening is provided on the innermost side. the process of the receiving department; and A step of closing both sides in the longitudinal direction of the rolled-in storage portion to form a bundled end portion. 9. The manufacturing method of the foldable bag according to claim 8, wherein, The step of forming the opening of the handle includes a step of bending downward at a mountain fold line parallel to and spaced apart from the pair of short sides to form the interval required for forming the rising portion, The step of forming the folded end is to fold at a fold line that is equally spaced from the axis of symmetry and the crease line so that the raised portions face each other on the axis of symmetry. 10. The method of making a foldable bag according to claim 8, wherein, The step of forming the handle opening includes the step of forming a handle along the pair of short sides. 11. The method of making a foldable bag according to claim 9, wherein, The step of forming the handle opening includes the step of forming a handle along the pair of short sides. 12. The manufacturing method of the foldable bag according to claim 10, wherein, The step of forming the handle portion includes a step of forming a through-opening portion near the pair of short sides. 13. The method of making a foldable bag according to claim 11, wherein, The step of forming the handle portion includes a step of forming a through-opening portion near the pair of short sides. 14. The method of making a foldable bag according to any one of claims 8 to 13, wherein, The step of forming the storage portion includes a step of forming an inner pocket parallel to the handle opening.

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