CN113423303B

CN113423303B - Folding bag and manufacturing method thereof

Info

Publication number: CN113423303B
Application number: CN202080012997.6A
Authority: CN
Inventors: 菊田南
Original assignee: Marna Inc
Current assignee: Marna Inc
Priority date: 2019-05-31
Filing date: 2020-05-15
Publication date: 2023-03-03
Anticipated expiration: 2040-05-15
Also published as: CN113423303A; CN212488868U; TW202106198A; JP6908796B2; TWI766278B; WO2020241307A1; JPWO2020241307A1; SG11202108146YA

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

Folding bag and manufacturing method thereof

Technical Field

The present invention relates to a portable folding bag, and more particularly to a folding bag which can be folded into a rectangular flat shape only by pulling both side portions in the direction of pulling them apart from each other in a use state, and a method of manufacturing the folding bag.

Background

Various folding bags made of sheet materials and foldable to be small in size in consideration of carrying when not in use have been proposed.

As an example of such a bag, there is known a foldable enclosure body including: a sheet-like material, which is formed into a predetermined rectangular flat band-like shape with both ends in the longitudinal direction closed by simply pulling the both ends in the pulling direction after use, wherein the enclosure is formed of an opening portion for linearly extending a widthwise central portion or one side edge thereof from one end portion to the other end portion when the enclosure is in the band-like shape and for taking in and out an object, and an enclosure body having a corrugated structure; the enclosure body is positioned on one half portion and the other half portion thereof with the opening therebetween, and is formed of a plurality of wrinkles formed by repeating mountain folds and valley folds with a predetermined width (see patent document 1).

In addition, the following belts are also known: it has a small, expandable single-pocket bag body having a fabric and wrinkles that expand asymmetrically according to the contents, the fabric being folded into an overlapped shape using the wrinkles when the bag body is empty and fixed with respect to a strap, and can be placed closely on the wearer's body during use to firmly hold a small object, and the strap has a bag body that can expand to hold a larger object (see patent document 2).

Documents of the prior art

Patent literature

Patent document 1: international publication No. 2017/033902 handbook

Patent document 2: japanese patent application laid-open No. 2010-517724

Disclosure of Invention

Problems to be solved by the invention

In the foldable enclosure body described in patent document 1, although the both ends in the longitudinal direction can be closed by simply pulling the both ends in the pulling-apart direction after use, there is a problem that it is necessary to perform hot pressing so that wrinkles do not disappear when the enclosure body having the bellows structure is manufactured, and it is necessary to manufacture the foldable enclosure body at a cost.

In the tape with a bag described in patent document 2, although it is not necessary to heat press the wrinkles when the bag is manufactured, it is necessary to prepare a fabric having stretchability in a direction intersecting with the tape direction as a material for manufacturing the bag, and there is a problem in that it requires a cost for manufacturing the tape with the bag, as in patent document 1.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a foldable bag which is produced by winding a rectangular sheet-like material from a folded end without using a hot press and which can be rolled into a rectangular flat shape only by pulling both side portions in a pulling direction from a use state, and a method of producing the foldable bag.

Means for solving the problems

In order to solve the above problems, the present invention adopts the following structure as a folding bag: a foldable bag capable of being rolled into a rectangular flat shape, comprising: a handle opening portion formed along a pair of short sides of a rectangular sheet material; folding ends that are formed on both sides by folding the handle opening portions in an equally spaced manner from the symmetry axis so that the handle opening portions that face each other abut on or come close to the symmetry axis, with the vertical bisector of the long side of the sheet material being defined as the symmetry axis; a storage section formed by winding the folded end from both sides toward the handle opening section while forming a plurality of winding lines; and a bundling end portion formed by closing both longitudinal direction side portions of the rolled-in storage portion in an overlapped state, wherein the bundling end portion is pulled in a pulling-out direction from a use state, and the storage portion is rolled and folded.

In addition, as an embodiment of the folding bag, a structure is adopted in which the handle opening portion has a standing portion formed by bending at a predetermined interval from the pair of short sides in parallel, a structure is adopted in which the handle opening portion has a handle portion formed along the pair of short sides, a structure is adopted in which the handle portion has a through opening portion formed near the pair of short sides, and a structure is adopted in which the storage portion has an inner pocket formed in parallel with the handle opening portion.

In addition, as a manufacturing method of the folding bag, the following structure is adopted: the method for producing a foldable bag, which comprises the steps of pulling both side portions in a pulling direction from a use state to fold the foldable bag into a rectangular flat shape, and folding the foldable bag, comprises: a step of spreading a rectangular sheet material having a long side and a short side; forming a handle opening along a pair of short sides of the sheet material; a step of folding the sheet-like material upward at equal intervals from the symmetry axis with the vertical bisector of the long side of the sheet-like material as the symmetry axis, so that the handle openings facing each other abut on or come close to the symmetry axis, and forming folded ends parallel to the short sides on both sides; a step of forming a storage section by winding the folded end from both sides toward the handle opening section while forming a plurality of winding lines; and a step of closing both longitudinal side portions of the wound housing portion to form a bundling end portion.

In addition, 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 a necessary interval for forming the standing portion, the step of forming the handle opening includes a step of forming a handle portion along the pair of short sides, the step of forming the handle portion includes a step of forming a through opening near the pair of short sides, and the step of forming the storage portion includes a step of forming an inner pocket in parallel with the handle opening.

Effects of the invention

The folding bag of the present invention can be manufactured by preparing a sheet of rectangular sheet material by adopting the above-described configuration, and winding the sheet material in order from the folding ends formed on the left and right sides around the axis of symmetry, without performing pleating using hot pressing, and can fold the storage section by simply pulling the bundling end in the pulling-out direction from the use state when carrying the folding bag.

In the method for manufacturing a foldable bag according to the present invention, the folding is performed by unfolding a rectangular sheet material and winding the sheet material in order from the folding ends formed on the left and right sides toward the handle opening with the axis of symmetry as the center, and the manufacturing process of the foldable bag can be simplified because the foldable bag is manufactured without using hot pressing.

Drawings

Fig. 1 is a view showing a folded state of a foldable bag according to a first embodiment of the present invention, wherein (a) is a front view, and (b) is a cross-sectional view in the X1-X1 direction of (a).

Fig. 2 is a plan view showing an unfolded state of the sheet material for producing the foldable bag according to the first embodiment of the present invention.

Fig. 3 is a perspective view showing a process of folding the sheet-like material of fig. 2.

Fig. 4 is a view showing a state in which a sheet-like material folded in accordance with the step of fig. 3 is rolled in, (a) is a perspective view showing a state in which the sheet-like material is rolled in twice, and (b) is a perspective view showing a state in which the sheet-like material is rolled in three times.

Fig. 5 is a perspective view showing a finishing process of the foldable bag according to the first embodiment of the present invention, where (a) is a perspective view showing a state where the side end portions are sewn, and (b) is a perspective view showing a state where the band-shaped material is sewn to the side end portions.

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

Fig. 7 is an explanatory view showing a procedure for folding the foldable bag according to the first embodiment, (a) is a view showing a state in which the bundled end portions at both ends are pulled in the opening direction, and (b) is a view showing a state in which the storage section folded in two is wound in the longitudinal direction.

Fig. 8 is a plan view showing an expanded state of a sheet material for producing a foldable bag according to the second embodiment of the embodiment.

Fig. 9 is a plan view showing an unfolded state of a sheet material for producing a foldable bag according to a third embodiment of the present invention.

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

Fig. 11 is a view showing a folded state of a foldable bag according to a fourth embodiment of the present invention, wherein (a) is a front view, and (b) is a cross-sectional view in the X2-X2 direction of (a).

Fig. 12 is a plan view showing an expanded state of a sheet material for producing a foldable bag according to the fourth embodiment.

Fig. 13 is a perspective view showing a process of folding the sheet-like material of fig. 12.

Detailed Description

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

In the following description, the vertical direction is "up and down", the horizontal direction is "left and right", and the direction from the near side to the depth side of the paper surface is "front and back", as viewed in the front view of fig. 1 (a).

Example 1

In fig. 1, a is a folding bag in a folded state, B is a storage section folded in a rectangular flat shape, C is a bundling end section in which both longitudinal direction side sections of the storage section B are closed in a state of being overlapped, D is a handle opening section provided at the innermost side of the storage section B for taking in and taking out a stored article, and E is a bundling section for bundling in a state in which the storage section B is folded in a small size in the longitudinal direction.

As shown in fig. 2, the storage section B and the handle opening D are formed by one rectangular sheet-like member 1, and the sheet-like member 1 is formed by long sides 2 and short sides 3, and in the present embodiment, as a material of the sheet-like member 1, a non-stretch fabric (woven fabric) of polyester is used, but any flexible sheet-like member having a required strength and bendability may be selected as long as it is a fabric made of synthetic fibers such as nylon, cotton, or natural fibers, or a laminate material in which synthetic resin is applied to the fabric.

The spread sheet material 1 is bent downward (mountain-folded) at a mountain fold line ML parallel to the pair of short sides 3 and spaced apart by a predetermined interval S1 required for forming the standing part f, thereby forming handle opening parts D.

In the present embodiment, V-shaped cut portions 4 are formed from the short sides 3 toward the inside of the handle opening portion D, and a handle portion 5 made of a tape material having a width smaller than the space S1 is formed (sewn) on the short side 3 side of the cut portions 4. However, the handle opening D may be formed by bending the sheet material 1 at the required interval S1 in parallel from the short side 3 of the sheet material 1 to form the rising portion f, and instead of sewing the sheet material 1 with other materials as in the present embodiment, the handle portion may be formed by performing a required process on the portion of the sheet material 1 where the handle opening D is formed, as shown in a second embodiment described later.

Next, the sheet material 1 is folded back (valley-folded) in the arrow direction (upward) at a folding line FL spaced from the symmetry axis CL and the fold line ML and the like by an interval S2 so that the standing parts f of the folded handle opening parts D face each other on the symmetry axis CL, and folded ends 6 parallel to the symmetry axis CL are formed on both sides of the sheet material 1, as shown in fig. 3, in order to form the storage parts B line-symmetrically with respect to the symmetry axis CL which is the perpendicular bisector of the long side 2. In this case, the handle openings D facing each other on the axis of symmetry CL preferably abut each other, but may be only close to each other.

Next, the sheet material 1 having the folded end 6 formed thereon is wound in order along the first folding line RL1 and the second folding line RL2 from both sides toward the handle opening portion D as indicated by arrows shown in fig. 3.

In the present embodiment, a first folding line RL1 having a winding width R1 from the folded end 6 and a second folding line RL2 having a winding width R2 from the first folding line RL1 and a winding width R3 from the mountain folding line ML are formed on the sheet material 1 on which the folded end 6 is formed, and the respective winding widths are set to be gradually larger so as to satisfy the relationship of R1 < R2 < R3.

Here, a description will be given of a winding step of the sheet material 1 having the folded end 6 formed thereon, and when the folded end 6 formed on the sheet material 1 is wound in order along the first folding line RL1 and the second folding line RL2 from both sides as indicated by arrows shown in fig. 4 (a) from the state shown in fig. 3, the sheet material is wound so that each winding width becomes R3 with the symmetry axis CL as a boundary.

Further, when the sheet material 1 rolled in the state shown in fig. 4 (a) is bent upward along the mountain fold line ML from both sides, as shown in fig. 4 (B), the storage section B is formed so as to be folded in a state of sandwiching the handle opening D inside. At this time, the folded housing portion B has a rectangular flat shape including a bottom surface 7 formed along the symmetry axis CL, a pair of folded upper edges 8 formed along the second folding line RL2, and side end portions 9 formed on both longitudinal side portions in an overlapped state.

In the present embodiment, the folded end 6 formed on the sheet material 1 is wound three times along the first folding line RL1, the second folding line RL2, and the mountain folding line ML as shown in the schematic cross-sectional view of fig. 1 (B) in order to form the storage section B, but the winding process of the sheet material 1 may be performed with the number of winding times increased or decreased depending on the size of the folded package a.

Next, as shown in fig. 5 (a), the storage section B folded into the state shown in fig. 4 (B) is sewn along the side end portions 9 formed on both sides in the longitudinal direction as a stitch 10, and one end of a looped rubber binding section E is sewn to one side end portion 9 so as to fold and bind the storage section B in the longitudinal direction from the vicinity of the center toward the outside.

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

As shown in fig. 5 (B), the bundling end portion C is formed of a pair of strip-shaped materials 11 having an overall length set to twice as much as the winding width R3, which is the width of the folded housing portion B, and each strip-shaped material 11 is folded back from the fold line 12 and sewn so as to sandwich the side end portion 9 of the folded housing portion B in order to close the side end portion 9 formed in the housing portion B in a state of being overlapped.

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

The folding bag a in the unfolded use state has a shape like a rucksack as a whole, and is constituted by a bottom surface 7 having a width about twice as large as a winding width R3 (from a symmetry axis CL to a folding upper edge 8), a main body portion 13 having front and rear folding ends 6 rising from the bottom surface 7 in the front and rear direction as a middle line, and a top gusset portion 14 formed with a cut portion 4 continuously from the main body portion 13 and a handle opening portion D to which an upper handle portion 5 is connected.

Next, the operation and effects of the present embodiment will be described with reference to the drawings.

As described above, the folding bag a of the present embodiment is produced in a folded state as shown in fig. 1 by winding the rectangular unfolded sheet material 1 shown in fig. 2, and therefore, a procedure for setting the folding bag a in a folded state to a usable state will be described.

First, the bundling section E is released from the storage section B bundled by the rubber bundling section E, and as shown in fig. 1 (a), the bottom 7 is opened in the left-right direction with the bottom facing downward, and at this time, the storage section B is closed with the bottom 7 as shown in the schematic cross-sectional view of fig. 1 (B), and the folding upper side 8 is in a state of being separable from the front and back.

Then, when the folded upper part 8 is opened forward and backward, the handle part 5 sewn to the handle opening D is lifted upward from the storage part B, and the bottom surface 7 is pulled downward, the foldable bag a becomes usable as shown in fig. 6, and therefore, after the stored article is put into the handle opening D, the handle part 5 can be held by hand or used while being supported on the shoulder. At this time, the folding bag a can be made neat in appearance as a bag because the bundling end portion C is hidden by the main body portion 13 such as the folding upper side 8.

Next, a procedure for reducing the size of the folded bag a after use will be described with reference to fig. 7, in which the handle opening D of the folded bag a is completely opened from the state shown in fig. 6, the collected articles are taken out, the collected end portions C provided on both sides of the storage portion B are gripped with both hands, and as shown in fig. 7 (a), the collected end portions C on both sides are pulled in the pull-out direction (arrow direction) with both hands, and if complete folding cannot be performed at a time, the storage portion B can be folded into a rectangular flat shape by pulling the collected end portions C again in the arrow direction.

Then, as shown in fig. 7 (B), the storage section B is folded in two at the fold line 15 in the longitudinal direction, then folded in a manner to be smaller from the fold line 15, and finally bundled by the bundling section E made of rubber, and the folding of the folding type bag a is completed.

As described above, the folding bag a of the present embodiment can easily produce the storage section B without pleating by hot pressing by preparing one rectangular sheet material 1 and winding it in order from the folding ends 6 formed on the left and right sides around the symmetry axis CL.

Example 2

Next, a second embodiment in which the structure of the hand grip portion 5 in the first embodiment is changed will be described.

Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, and only different components are denoted by different reference numerals, and the description will be centered on the differences.

In fig. 8, reference numeral 21 denotes a rectangular sheet-like material having a long side 22 and a short side 23, and constitutes the storage section B and the handle opening D of the folding bag a shown in fig. 1. The sheet 21 has a shorter side 23 having the same size as the sheet 1, but has a longer side 22 longer than the longer side 2 of the sheet 1 by a distance S3 set for each of the upper and lower portions, as compared with the sheet 1 of the first embodiment.

The developed sheet material 21 is formed with through openings 24 of a semi-elliptical shape near the pair of short sides 23, respectively. The sheet material 21 is valley-folded at a valley-folding line VL parallel to the short side 23 and spaced apart by a predetermined interval S3, so that the short side 23 is aligned with a double line OL contacting a straight line portion passing through the opening 24, and the two pieces are overlapped and sewn together to form the handle portion 25. In the present embodiment, the through opening 24 is reinforced by sewing a reinforcing tape 26 around it.

In the present embodiment, the folding bag a shown in fig. 1 is produced in a folded state by unfolding and rolling the rectangular sheet material 21 shown in fig. 8 as in the first embodiment, but the handle portion 25 formed in the handle opening portion D is different from the handle portion 5 of the first embodiment, and therefore, the description will be given.

In the present embodiment, as described above, the rectangular developed sheet material 21 shown in fig. 8 is passed through the through opening 24 near the pair of short sides 23, and then valley-folded at the valley-folding line VL separated from the short sides 23 by the space S3, whereby the short sides 23 are aligned with the double-line OL and the two pieces are overlapped and sewn to form the handle portion 25.

After the handle portion 25 is formed, the sheet material 21 is bent downward at a mountain fold line ML parallel to the pair of short sides 23 and separated by a predetermined distance S1, thereby forming rising portions f, respectively, in the same manner as the handle opening portion D shown in fig. 3. Thereafter, the folding bag a is produced by the same procedure as in the first embodiment shown in fig. 3 to 5.

As described above, in the present embodiment, the handle portion 25 can be formed in the portion to be the handle opening D by preparing only one rectangular sheet 21, forming the through opening 24 on each short side 23 side of the sheet 21, and overlapping and sewing the two sheets.

Example 3

Next, a third embodiment in which the configurations of the housing portion B and the bundling portion E in the first embodiment are changed will be described.

Hereinafter, the same components as those of the first embodiment are denoted by the same reference numerals, and only different components are denoted by different reference numerals, and the description will be centered on the differences.

In fig. 10 (a), aa is a folded bag in a folded state, ba is a storage section folded in a rectangular flat shape, C is a bundling end section in which both longitudinal direction side sections of the storage section Ba are closed in an overlapped state, D is a handle opening section (see fig. 10 (b)) provided at the innermost side of the storage section Ba for taking and placing the stored article 29, and Ea is a bundling section for bundling the storage section Ba in a state of being folded in a longitudinal direction to be small. In the present embodiment, the bundling section Ea is provided on the side of the storage section Ba of the bundling end section C, unlike the first embodiment, but the bundling section Ea may be provided at any position as long as the bundling section Ea can bundle the storage section Ba in a state folded in the longitudinal direction like the storage section B shown in fig. 7 (B).

In fig. 9, reference numeral 1 denotes a rectangular sheet material having a long side 2 and a short side 3, and constitutes the storage section Ba and the handle opening D of the folding bag Aa shown in fig. 10. In the present embodiment, V-shaped cuts 4 are formed from the short sides 3 toward the inside in the handle opening D, and handle portions 5 made of a tape material having a width smaller than the interval S1 are sewn to the short sides 3 of the cuts 4.

An inner pocket P is formed by sewing the opened sheet material 1 at a stitch 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 the present embodiment, in order to form the inner pocket P, the additional sheet material 27 having the same lateral dimension as the short side 3 and the longitudinal dimension larger than the depth d of the inner pocket P by the sewing margin is used, but the size of the additional sheet material 27 forming the inner pocket P may be appropriately selected according to the desired width w and depth d of the inner pocket P.

In this embodiment, the folded bag Aa shown in fig. 10 (a) is produced in a folded state by winding the rectangular unfolded sheet material 1 shown in fig. 9 in the same manner as in the first embodiment, but the description will be given because the inner pocket P is formed inside the storage section Ba, unlike the storage section B of the first embodiment.

In the present embodiment, as shown in fig. 9, the additional sheet material 27 is disposed at a position where the upper end thereof contacts the front end of the cut portion 4 formed in the rectangular developed sheet material 1, and then the additional sheet material 27 is sewn to the sheet material 1 at the stitches 28, thereby forming the inner pocket P inside the receiving portion Ba. At this time, the width w of the inner pocket P can be appropriately set by changing the position of the sewn stitch 28.

After the inner pockets P are formed, the sheet material 1 is bent downward at a mountain fold line ML parallel to the pair of short sides 3 and separated by a predetermined distance S1, thereby forming respective standing portions f in the same manner as the handle opening portions D shown in fig. 3. Thereafter, the folding bag Aa is produced by the same procedure as in the first embodiment shown in fig. 3 to 5.

Since the folding bag Aa is made in a folded state, the appearance of the folding bag Aa in the use state will be described with reference to fig. 10 (b), and the folding bag Aa in the use state can store the stored articles 29 such as lunch boxes in the storage section Ba from the handle opening D, and the beverage bottles 30 and the like are stored in the inner pocket P formed inside the storage section Ba in a state of being placed on the hammock at a position separated from the stored articles 29.

As described above, in the present embodiment, by sewing the additional sheet material 27 to the single rectangular sheet material 1 constituting the storage section Ba and the handle opening D of the foldable bag Aa and forming the inner pocket P inside the storage section Ba, the beverage bottle 30 and the like can be stored in the inner pocket P in a separated state unlike the stored articles 29 such as lunch boxes stored in the bottom of the storage section Ba, and the hot stored articles 29 do not come into contact with the cold bottle 30, and there is no fear that the stored articles 29 are crushed by the bottle 30.

Example 4

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

In fig. 11, ab is a folded-up folding bag, bb is a storage portion folded into a rectangular flat shape, C is a bundling end portion in which both longitudinal direction side portions of the storage portion Bb are closed in a state of being overlapped, da is a handle opening portion provided at the innermost side of the storage portion Bb for taking in and taking out stored articles, ea is a bundling portion for bundling the storage portion Bb in a state of being folded down in the longitudinal direction, and 35 is a handle portion formed at the handle opening portion Da.

As shown in fig. 12, the storage section Bb and the handle opening Da are formed by a single rectangular sheet 31, the sheet 31 is formed by long sides 32 and short sides 33, and the sheet 31 has the short side 33 having the same size as the sheet 1 as compared with the sheet 1 of the first embodiment, but the long side 32 is longer than the long side 2 of the sheet 1 by a size similar to the winding width R0 set in the left-right direction shown in fig. 13.

The spread sheet material 31 is folded back (valley-folded) in the arrow direction (upward) at a folding line Fla at an equal interval S4 from the symmetry axis CL and the short sides 33 so that the storage sections Bb are formed symmetrically across the symmetry axis CL, which is the perpendicular bisector of the long sides 32, and the handle opening sections Da formed along the pair of short sides 33 face each other on the symmetry axis CL, and folded ends 36 parallel to the symmetry axis CL are formed on both sides of the sheet material 31, as shown in fig. 13. In this case, it is desirable that the handle opening portions Da facing each other on the axis of symmetry CL be as close to each other as possible.

Next, handle portions 35 made of a tape material are sewn to the handle opening portions Da facing each other on the axis of symmetry CL so as to connect the center portions of the short sides 33 to each other. Then, the sheet material 31 having the folded end 36 formed thereon is wound in order along the first winding folding line RL1, the second winding folding line RL2, and the third winding folding line RL3 from both sides toward the handle opening portion Da as shown by arrows in fig. 13.

In the present embodiment, a first folding line RL1 having a winding width R0 from the folded end 36, a second folding line RL2 having a winding width R1 from the first folding line RL1, and a third folding line RL3 having a winding width R2 from the second folding line RL2 and a winding width R3 from the short side 33 are formed on the sheet material 31 on which the folded end 36 is formed, and the respective winding widths are set to be gradually increased so as to satisfy a relationship of R0 < R1 < R2 < R3.

When the folded end 36 formed on the sheet material 31 is sequentially wound from both sides along the first winding fold line RL1, the second winding fold line RL2, and the third winding fold line RL3 as indicated by arrows in the state shown in fig. 13, the sheet material is wound so that each winding width becomes R3 with the symmetry axis CL as a boundary. The sheet material 31 wound in through the above steps forms a storage portion Bb folded in a state where the handle opening Da is hidden in the inner bottom portion, as shown in the schematic cross-sectional view of fig. 11 (b). At this time, as shown in fig. 11 (a), the folded housing portion Bb has a rectangular flat shape formed by a bottom surface 37 formed along the symmetry axis CL, a pair of folded upper edges 38 formed along the third folding line RL3, and bundling end portions C formed in an overlapped state at both longitudinal side portions.

In the present embodiment, the folded end 36 formed on the sheet material 31 is wound three times along the first winding line RL1, the second winding line RL2, and the third winding line RL3 as shown in fig. 11 (b) in order to form the storage section Bb, but the winding process of the sheet material 31 may be performed with the number of winding times increased or decreased depending on the size of the folded package Ab.

The folding bag Ab of the present embodiment is produced in a folded state as shown in fig. 11 by folding and rolling the rectangular unfolded sheet material 31 shown in fig. 12 at the folding line Fla at the equal interval S4 from the symmetry axis CL and the short side 33, as in the first embodiment, 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, and therefore, a description will be given of a procedure for setting the folding bag Ab in a folded state to a usable state.

First, as in the first embodiment, the bundling section Ea is separated from the storage section Bb bundled by the bundling section Ea, and as shown in fig. 11 (a), the bottom surface 37 is extended in the left-right direction with the bottom surface facing downward, and at this time, the storage section Bb is in a state where the bottom surface 37 is closed as shown in the schematic cross-sectional view shown in fig. 11 (b), and the folding upper side 38 is in a state of being separable in the front-rear direction.

Then, the folding top 38 is opened forward and backward, the handle portion 35 sewn to the handle opening Da of the storage portion Bb is lifted upward, and the bottom surface 37 is pulled downward, so that the folding bag Ab is brought into a usable state, and therefore, after the storage article is put into the handle opening Da, the handle portion 35 can be held by hand or carried on the shoulder.

Next, a description will be given of a procedure of folding the used foldable bag Ab, in which the handle opening Da of the foldable bag Ab is completely opened from the use state, the bundling end portions C provided on both sides of the storage portion Bb are gripped with both hands after the storage article is taken out, and the bundling end portions C on both sides are pulled in the pull-out direction with both hands, whereby the storage portion Bb is neatly wound, and the storage portion Bb can be folded into a rectangular flat shape as shown in fig. 11 (a).

As described above, the folding bag Ab of the present embodiment is manufactured by preparing a single rectangular sheet material 31 and sequentially rolling in from the folding ends 36 formed on the left and right sides around the axis of symmetry CL in a state where the handle openings Da formed along the pair of short sides 33 are opposed to each other, thereby not forming the standing part f in the handle openings Da, and therefore, after use, the bundling end parts C provided on both sides of the storage part Bb are pulled in the pulling direction by both hands, and the storage part Bb is rolled in more easily than the first embodiment in which the standing part f is formed, and can be folded in order at one time. In addition, since the handle portion 35 is formed so as to connect the handle opening portions Da facing each other on the symmetry axis CL, the handle opening portion Da folded to the inner bottom portion of the storage portion Bb can be easily unfolded by lifting the handle portion 35 from the folded state when the folding bag Ab of the present embodiment is used.

Industrial applicability of the invention

The folding bag according to the present invention has an appearance in use in which the bundling end portion is hidden by the main body portion, and therefore, the bag can be neatly shaped, and the storage portion can be rolled and folded into a rectangular flat shape only by pulling the bundling end portion in the direction of pulling it open from the use state.

Description of the reference numerals

A. Aa, ab: folding bag

B. Ba, bb: storage part

C: bundling end

D. Da: handle opening part

E. Ea: binding part

CL: symmetry axis (center line)

FL, FLa: folding line

ML: mountain fold line

OL: coincident line

P: inner pocket

RL1, RL2, RL3: rolling folding line

R0, R1, R2, R3: width of winding

S1, S2, S3, S4: spacing(s)

VL: valley fold line

d: depth of field

f: rising part

w: width of

1. 21, 31: sheet material

2. 22, 32: long side

3. 23, 33: short side

4: cutting part

5. 25, 35: handle part

6. 36: folding end

7. 37: bottom surface

8. 38: folding upper side

9: side end part

10. 28: stitch trace

11: strip material

12. 15: crease line

13: main body part

14: top gusset part

24: through opening

26: reinforcing band

27: additional sheet material

29: storage article

30: bottle (Ref. TM. Bottle)

Claims

1. A foldable bag capable of being rolled into a rectangular flat shape, comprising:

a handle opening formed along a pair of short sides of a rectangular sheet material having a long side and a short side;

folding ends, which are formed by folding upward at folding lines at equal intervals from the symmetry axis and the handle opening parts on both sides, with a vertical bisector of the long side of the sheet material as the symmetry axis, and the handle opening parts are abutted or approached to face each other on the symmetry axis, and the folding ends are parallel to the symmetry axis;

a storage section configured to wind the folded end from both sides thereof toward the handle opening section while forming a plurality of winding lines, the winding lines being wound so that a winding width thereof gradually increases, the storage section being formed such that the handle opening section is disposed at an innermost side; and

a bundling end part formed by overlapping both longitudinal direction side parts of the rolled containing part and being closed,

the bundling end is pulled in the pulling direction from the use state, and the containing part is rolled and folded.

2. The folding bag of claim 1,

the handle opening part is provided with a standing part which is formed by bending downwards at a mountain folding line which is parallel to the pair of short sides and is separated by a preset interval,

the folding ends are folded at folding lines at equal intervals from the symmetry axis and the handle opening part in such a manner that the standing parts face each other on the symmetry axis.

3. The folding bag of claim 1,

the handle opening portion has a handle portion formed along the pair of short sides.

4. The folding bag of claim 2,

5. The folding bag of claim 3,

the handle portion has a through opening portion formed near the pair of short sides.

6. The foldable bag of claim 4,

7. The folding bag of any one of claims 1 to 6,

the storage section has an inner pocket formed in parallel with the handle opening section.

8. A method of manufacturing a foldable bag, which is rolled and folded into a rectangular flat shape by pulling both side portions in a pull-out direction from a use state, comprising:

a step of spreading a rectangular sheet material having a long side and a short side;

forming a handle opening along a pair of short sides of the sheet material;

a step of folding the handle opening portions upward at folding lines at equal intervals from the symmetry axis and the handle opening portions, with a vertical bisector of the long side of the sheet material as a symmetry axis, and forming folding ends parallel to the symmetry axis at both sides;

a step of winding the folded end from both sides toward the handle opening portion while forming a plurality of winding lines, and forming a storage portion such that the winding width is gradually increased, the handle opening portion being provided at the innermost side; and

and a step of closing both longitudinal side portions of the wound housing portion to form a bundling end portion.

9. The method of making a foldable bag according to claim 8,

the step of forming the handle opening portion includes a step of bending downward at a mountain fold line which is parallel to the pair of short sides and is spaced apart from the pair of short sides to form a space required for the standing portion,

and a step of forming the folded end by folding the standing part at a folding line at an equal interval from the symmetry axis and the mountain folding line so that the standing parts face each other on the symmetry axis.

10. The method of making a foldable bag according to claim 8,

the step of forming the handle opening portion includes a step of forming a handle portion along the pair of short sides.

11. The method of making a foldable bag according to claim 9,

the step of forming the handle opening includes a step of forming a handle portion along the pair of short sides.

12. The method of making a foldable bag according to claim 10,

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,

14. The method of making a foldable bag according to any one of claims 8 to 13,

the step of forming the storage section includes a step of forming an inner pocket in parallel with the handle opening section.