JP6199728B2 - Folding bag manufacturing apparatus and folding bag manufacturing method - Google Patents

Description

  The present invention relates to a method of manufacturing a bag from continuous sheets, and more particularly to an apparatus and a method of manufacturing a bag in which both sides are folded inward (gusset-folded).

  2. Description of the Related Art Conventionally, a method and an apparatus for manufacturing a bag by folding a sheet in half in a longitudinal direction, cutting in a transverse direction to seal a predetermined portion, and folding both side surfaces to the inner side are known ( For example, see Patent Document 1 or Patent Document 2).

  In the invention described in Patent Document 1, the tubular film is formed by rolling the film into a tubular shape and sealing the seam. The long cylindrical film is cut in a direction crossing to seal the cut portion, and a gusset is formed by a pair of folding members.

  Moreover, in the invention described in Patent Document 2, the packaging sheet supplied by the sheet supply means is wound around the outer periphery of a cylindrical cylinder arranged in the vertical direction through a former, and the seam is wound. Are welded in the vertical direction by a vertical sealer. A pair of folding plates are pushed into both sides of the cylindrical packaging sheet whose lower end portion is sealed in the lateral direction to form a crease, and then a predetermined portion of the packaging sheet is welded and sealed, and cut with a cutter.

Japanese Patent No. 4132940 JP 2007-197033 A

  The bag (gusset fold bag) formed by the inventions described in Patent Document 1 and Patent Document 2 and having both side portions folded inwardly has a configuration in which the bottom side is sealed. Such a configuration of the bag may cause a problem. For example, in the drip coffee extraction sheet, it is said that the extraction effect is higher when the bottom is not sealed. Further, when the bottom portion is sealed, there is a problem that internal powder or the like may leak if there is a sealing failure.

  A first invention described in claim 1 is made in order to solve the above-described problem, and includes a folding means for folding the sheet in half along the longitudinal direction, and the longitudinal direction of the folded sheet. Seal cut means for creating a bag with one end opened, a pair of plate-like members inserted into the bag from the opening, and a pair of these plate-like members. An opening / closing means for opening and closing, a pair of folding guides movable from both side surfaces of the bag to the inside, and a moving means for approaching and separating the both folding guides, the pair of plate-like members inserted in the bag being opened Later, the pair of plate-like members are closed, and the side of the bag is folded by bringing the folding guide closer.

  The invention described in claim 2 is characterized in that in the invention of claim 1, clamping means is provided for clamping the bag so as to avoid the place where the plate-like member of the bag is inserted and positioning the bag. It is what.

  Furthermore, in the invention described in claim 3, in the invention of claim 1 or claim 2, an advance / retreat means for advancing / retreating the plate member from the opening side of the bag to the bottom side is provided. It is characterized by.

  According to a fourth aspect of the present invention, there is provided an advancing / retreating means for advancing / retreating the folding guide from the opening side of the bag to the bottom side in the inventions of the first to third aspects. It is a feature.

  According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, there is provided point seal means for sealing the bottom surface of the bag folded on both side surfaces and a part of the side surface. It is characterized by this.

  According to a sixth aspect of the present invention, there is provided a folding bag manufacturing method for solving the above-mentioned problems, wherein the sheet is folded in two along the longitudinal direction and the direction transverse to the longitudinal direction. A step of creating a bag with one end opened by cutting the seal into a bag, a step of inserting a pair of plate-like members into the bag from the open end of the bag, and expanding the plate-like member to the bag And the step of folding the side surface of the bag by moving the pair of folding guides from both side surfaces of the bag to between the pair of plate-like members.

  Further, in the invention described in claim 7, in the invention of claim 6, after the step of expanding the plate-like member to expand the bag, the portion of the bag avoiding the plate-like member is clamped and positioned. It has the process, It is characterized by the above-mentioned.

Furthermore, in the invention described in claim 8, in the invention of claim 6 or 7, after the step of folding the side surface of the bag by the folding guide, the plate-like member is placed on the bottom surface side opposite to the opening end of the bag. a step of moving to, is characterized in that a step of moving the guide narrowing folding the direction toward the bottom surface of the bag.

Further, the invention described in claim 9 is the invention of claim 8, the guide narrowing folding said after moving direction toward the bottom surface of the bag, to seal a portion of the side surface which is folded on the bottom surface and the inner bag It has the process, It is characterized by the above-mentioned.

The bag manufacturing apparatus according to the present invention inserts a pair of plate-like members between both plate-like members from both sides thereof, after a pair of plate-like members are inserted and expanded inside the bag, and these plate-like members are brought close to each other. Since both sides of the bag are folded, the gusset-folded bag can be provided without sealing the bottom. Further, according to the invention of claim 8, the two plate-shaped members are moved to the bottom side, further, by moving the guide narrowing folded on the bottom side, folded exactly the opposite sides of the bag to the end of the bottom side be able to. Furthermore, according to the invention of claim 9, after the folding guide is moved to the bottom side and folded, the bottom surface and a part of the side folded to the inner side are sealed, whereby both sides are folded inside. The posture and shape can be maintained.

FIG. 1 is a perspective view for sequentially explaining each step of a method for manufacturing a folding bag according to an embodiment of the present invention. Example 1 2A and 2B are views showing a process of inserting a pair of plate-like members into the bag, wherein FIG. 2A is a plan view and FIG. 2B is a side view. FIGS. 3A and 3B are views showing a process of folding the side portion of the bag into the inner side by a folding guide, wherein FIG. 3A is a plan view and FIG. 3B is a side view. FIGS. 4A and 4B are diagrams showing a process of moving the pair of plate-like members and both guide members to the bottom side of the bag. FIG. 4A is a plan view and FIG. 4B is a side view. FIGS. 5A and 5B are diagrams showing a step of retracting the pair of folding guides and the plate-like member, where FIG. 5A is a plan view and FIG. 5B is a side view. FIG. 6A is a plan view showing the bag in a state before the gusset is folded, and FIG. 6B is a plan view showing the bag in a state where the gusset is folded. FIG. 7 is a plan view showing an operation portion of the positioning gripper. FIG. 8 is a side view showing a process of sealing a part on the bottom side of the folded bag and a part folded inside. FIG. 9 is a plan view showing a position where each step is performed in the rotary type folding bag manufacturing apparatus. FIGS. 10A and 10B are diagrams sequentially illustrating the bag centering process of the folding bag manufacturing apparatus according to the second embodiment. FIG. 11 is a plan view showing a position where each step is performed in the second embodiment.

  A sheet is folded at the center in the longitudinal direction, a two-layer sheet is cut in a transverse direction with a predetermined length and cut, the sheet is folded at the bottom, the sealed sides, and the bottom A bag having an opening on the opposite side is formed. Two plate-like members of the opening flapper are inserted and expanded from the opening of the bag, and the bag is expanded and centered. Thereafter, the positioning is performed by clamping the opening side of the bag with a positioning gripper. Both folding guides are inserted between the two plate-like members from both sides of the bag while bringing the two plate-like members close to each other. Thereafter, both plate-like members are inserted to the bottom of the bag, and both folding guides are moved to the bottom of the bag.

  After folding both sides of the bag to the end on the bottom side, the bottom surface and a part of the side part on the inside are point-sealed from the outer surface side of the bottom portion. After the point seal allows the both sides of the bag to be folded inward, the two plate-like members of the folding guide and the opening flapper are sequentially retracted toward the opening. After the upper and lower folding guides are separated from the bag, the positioning gripper is opened. Thereafter, the completed bag is gripped by the discharge gripper, and is extracted from the opening flapper and discharged.

  Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. In the manufacturing method using the folding bag manufacturing apparatus according to this embodiment, first, one continuous sheet 2 is folded into two at the center in the longitudinal direction. The half-folded sheet 2 is cut by sealing at a predetermined interval in the lateral direction (direction crossing the longitudinal direction). At this point, the bag 2A is formed in which the other end 2b is opened at the bottom where the one end 2a is folded in two (hereinafter, this end is referred to as the opening 2b), and the both sides 2c and 2d are sealed. (See FIG. 6 (a)). The bag 2A is supplied to the gusset folding device 4, and the both side portions 2c and 2d are folded inward to form a folded bag 2B (see FIG. 6 (b) showing the completed state). In this embodiment, the bag 2B is provided as a product in which powdered coffee is filled and the opening 2b is sealed, and the hanger 3 to be hooked on the coffee cup at the time of extraction is fixed to the sheet 2 in advance. Installed at intervals.

  One continuous sheet 2 is pulled out from a sheet roll (not shown) wound in a roll shape, sent out in a horizontal direction, and a horizontal direction arranged in a direction perpendicular to the conveying direction of the sheet 2 The direction is changed downward through the conversion roller 6. Furthermore, a folding means (having a pair of horizontal two-fold rollers 8A and 8B) is disposed below the sheet in the direction orthogonal to the direction change roller 6, and the sheet is formed by the two-fold rollers 8A and 8B. 2 is folded in half from the central portion in the longitudinal direction. The folded sheet 2 conveyed from the upper side to the lower side is in a state in which one side portion in the longitudinal direction (the right side portion in FIG. 1) is bent, and the other side portion (the left side portion in the same figure). ) Is a state in which two sheets are overlapped.

  A seal cutting means (ultrasonic seal and cutter 10) that seals the sheet 2 with ultrasonic waves and cuts at the sealing position is disposed on one side of the folded sheet 2 in the conveying direction. The ultrasonic seal and cutter 10 is disposed on one side surface of the half-folded sheet 2 and can be moved in the horizontal direction by a driving means (not shown). In addition, a delivery gripper 12 is provided at a position slightly lower than the ultrasonic seal and cutter 10 to sandwich the sheet 2 from the folded side of the folded sheet 2 (the side that later becomes the bottom 2a of the bag 2A). Yes. The delivery gripper 12 can move in the vertical direction. The delivery gripper 12 holds the bag 2A sealed and cut by the ultrasonic seal & cutter 10 and delivers it to the supply gripper 14.

  The supply gripper 14 has a pair of grip members 14A and 14B that can approach and separate from each other. The supply gripper 14 receives the bag 2A transferred by the delivery gripper 12, and moves in the horizontal direction (from the upper right to the lower left in FIG. 1). The gusset folding device 4). Each grip member 14A, 14B has a U-shape having a space on the front side in the transport direction. Both grip members 14A, 14B are configured to suck and hold the bag 2A, and suction holes (not shown) connected to a vacuum source (not shown) are opened on the suction surfaces facing each other. As will be described later, the gusset folding device 4 is configured to insert an opening flapper 16 from the opening 2b side of the bag 2A, and the grip members 14A and 14B of the supply gripper 14 are folded in two. Each of the two sheets is adsorbed, conveyed in a separated state, and delivered to the opening flapper 16.

  The gusset folding device 4 moves from the opening flapper 16 inserted into the bag 2A and both sides of the bag 2A (up and down of the bag 2A in this embodiment) to the inside of the bag 2A. Gusset provided with a folding guide 18 for folding the portions 2c and 2d inside the bag 2A, and a clamping means (positioning gripper 20) for clamping and positioning the opening 2b side of the bag 2A when performing folding operation or the like A folding unit 22 (see FIG. 2A) is provided.

  The opening flapper 16 is composed of two plate-like members (plates) 16A and 16B, and the two plates 16A and 16B stand upright by the supply gripper 14 (both side portions 2c and 2d are positioned vertically). In such a state, the bag 2A is supplied from the side of the opening 2b so that the bag 2A is inserted in the vertical direction. The opening flapper 16 is attached to a spline shaft 26 fitted to the spline bearing 24. The opening flapper 16 advances and retreats in an upright state by driving of advancing / retreating means (opening flapper advance / retreat motor 28) (see FIG. 2B). It can be done. The opening flapper 16 can be opened and closed with the two plates 16A and 16B approaching and separating from each other. In this embodiment, the two plates 16A and 16B of the opening flapper 16 are inserted into the bag 2A in a state of approaching, and then the bag 2A is expanded and centered by being expanded inside the bag 2A. As shown in FIG. 2A, the plates 16A and 16B are opened and closed by opening / closing means (the right plate opening / closing cylinder 30 and the left plate opening / closing cylinder 32) of the opening flapper 16.

  The folding guide 18 has a pair of blades 18A and 18B respectively disposed above and below the opening flapper 16 disposed in a state where the two plates 16A and 16B are erected. These two blades 18A and 18B move in a direction approaching each other, and fold the sealed side portions 2c and 2d of the bag 2A into the inner side of the bag 2A. As shown in FIG. 2B, the folding guide 18 is moved in the vertical direction by moving means (the upper blade lifting cylinder 34 and the lower blade lifting cylinder 36 of the folding guide 18). The two blades 18A and 18B are folded in the side portions 2c and 2d of the bag 2A and then moved in the direction toward the bottom portion 2a of the bag 2A to open the side portions 2c and 2d of the bag 2A. It can move horizontally so that it can be folded from the part 2b to the bottom part 2a. The frame 38 to which the blades 18A and 18B of the folding guide 18 are attached moves forward and backward along the sliders 42 and 44 by driving of the forward / backward moving means (folding guide forward / backward motor 40). The driving means for the opening flapper 16 and the folding guide 18 are not limited to cylinders and motors, and may be driven by other known mechanisms such as cams.

  Clamping means (positioning gripper 20) for positioning the bag 2A when the side flaps 2c and 2d of the bag 2A are folded by inserting the opening flapper 16 and moving the folding guide 18 is provided. As shown in FIG. 7, the positioning gripper 20 includes a pair of grip members 20 </ b> A (one not shown) that can rotate around a fulcrum 46. When both the grip members 20A are swung so that the grip surfaces 20Aa (one not shown) at their tips approach each other, the bag 2A is gripped from both sides by the grip surfaces 20Aa of both the grip members 20A. The operation portions 20Ab (one not shown) of these grip members 20A are connected to the gripper operation member 50 via a lever 48. The gripper operating member 50 has a lever 48 connected to the bifurcated connecting portions 50a and 50b. By moving the gripper operating member 50 forward and backward, both grip members 20A simultaneously swing in the opposite directions.

  The gripper operating member 50 is attached to a slider 54 (see FIGS. 2A and 2B) that is fitted to a rail 52 disposed at the center of the gusset folding unit 22, and drives the gripper opening / closing motor 56. Thus, it moves forward and backward along the rail 52. When the gripper operation member 50 moves forward (moves to the left in FIG. 2), both grip members 20A are closed to grip the bag 2A (indicated by the solid line in FIG. 7), and when the grip operation member 50 is retracted, both grip members 20A is opened to release the bag 2A (a state indicated by a broken line in FIG. 7). The positioning gripper 20 grips the opening 2b side of the bag 2A, and the opening flapper 16 is provided with a notch 16a for the positioning gripper 20 to grip the bag 2A.

  The bag 2B, which has been gusseted by the gusset folding device 4, is the next point seal station S, and the bottom surface 2a of the bag 2B and one end of the portion (side portions 2c, 2d) folded into the bag 2B. Weld the parts. The point seal means (point seal member 58) has heater portions 58a and 58b at two locations, and the heater portions 58a and 58b are brought into contact with the folding guide 18 being inserted into the bag 2B. To weld this part. By welding a part of the side part folded with the bottom part 2a in this way, the posture of the folding bag 2B (the state where both side parts 2c and 2d are folded) can be maintained.

  At the outer shape inspection station K next to the point seal station S, the outer shape of the bag 2B is inspected. An outline inspection sensor 60 is disposed in the outline inspection station K, and the outline inspection sensor 60 performs an outline inspection of the bag 2B. After the outline inspection, the bag 2B is sent to the bag delivery station U. A bag take-out means (discharge gripper 62) is provided at this position, and the bag 2B in which the gusset folding has been completed is taken out from the opening flapper 16 by the discharge gripper 62.

  Next, the manufacturing method by the manufacturing apparatus of a folding bag is demonstrated. The sheet 2 drawn out from a roll of sheet roll (not shown) is fed in the horizontal direction, and the direction is changed downward by the direction changing roller 6, and the longitudinal direction is changed by the pair of folding rollers 8A and 8B. Folded in the middle. The sheet 2 is fed downward in a stacked state. A transfer gripper 12 is disposed below the sheet cutting position by the ultrasonic seal and cutter 10, and grips the vicinity of the lower end portion of the double stacked sheet 2.

  The lower end of the two-layered sheets 2 gripped by the delivery gripper 12 is sealed by the previous sealing and cutting process by the ultrasonic seal and cutter 10. In a state where the two stacked sheets 2 are gripped by the delivery gripper 12, the ultrasonic seal and cutter 10 is moved in the lateral direction (direction traversing the longitudinal direction of the two stacked sheets 2) to thereby form the two sheets 2 Is welded and cut. At this point, the bottom 2a folded in two (located on the right side of FIG. 1), the sealed sides 2c and 2d (located on the top and bottom in the figure), and the two sheets 2 overlap. A bag 2A having an opening 2b (located on the left side of the figure) is formed, and the bottom 2a side is held by the delivery gripper 12.

  The bag 2 </ b> A held by the delivery gripper 12 is delivered to the lower supply gripper 14. The pair of grip members 14A, 14B of the supply gripper 14 has a vacuum acting on the suction surfaces facing each other, and sucks the two stacked sheets of the bag 2A. The pair of grip members 14 </ b> A and 14 </ b> B hold and transfer the bag 2 </ b> A with the opening 2 b widened at a slightly separated position, and supply the bag 2 </ b> A to the gusset folding device 4.

  The bag 2A sucked and held by the supply gripper 14 and supplied to the gusset folding device 4 is covered from the open opening 2b to the open flapper 16 in a state where the two plates 16A and 16B are closed from the outside (FIG. 1). The lateral width of the bag 2A (the length between the side portions 2c and 2d) is larger than the width (vertical length) of the opening flapper 16, and the bag 2A is fitted with a margin above and below the opening flapper 16. (See FIG. 2 (b)). Moreover, it covers the opening flapper 16 in a state where there is room on the bottom 2a side of the bag 2A.

  After the bag 2A is put on the opening flapper 16 in a state where the two plates 16A and 16B are closed, the left and right opening flapper opening / closing cylinders 30 and 32 are operated to attach the two plates 16A and 16B of the opening flapper 16 to each other. By expanding the bag, the bag 2A is expanded and centered. In this state, the gripper operating member 50 is advanced by the gripper opening / closing motor 56, the grip surfaces 20Aa of the grip members 20A on both sides are brought close to each other, and the two sheets on the opening 2b side of the bag 2A are gripped. The bag 2A is positioned by gripping with the positioning gripper 20 in this way. The folding bag manufacturing apparatus according to this embodiment is a rotary type, and the process of covering the opening flapper 16 with the bag 2A and the opening of the opening flapper 16 while the gusset folding unit 22 is stopped at the position A in FIG. A step of gripping the bag 2A by the positioning gripper 20 is performed. Since the apparatus according to this embodiment is a rotary machine, it is gripped by the positioning gripper 20 in order to prevent the bag 2A from jumping out of the opening flapper 16 during the rotational transfer.

  After positioning the bag 2A, the two plates 16A and 16B of the opening flapper 16 are closed by the opening flapper opening and closing cylinders 30 and 32, and the upper and lower folding guide raising and lowering cylinders 34 and 36 are operated so that the folding guide 18 The upper and lower blades 18A and 18B are inserted between the two plates 16A and 16B of the opening flapper 16, and both side portions 2c and 2d of the bag 2A are folded inward (see FIGS. 3A and 3B). This step is performed at position B in FIG.

  After both side portions 2c and 2d of the bag 2A are folded inward, the opening flapper advance / retreat motor 28 is driven to advance the opening flapper 16, and the tip thereof is moved to the bottom 2a of the bag 2A. Subsequently, the folding guide advance / retreat motor 40 is driven to move the folding guide 18 to the bottom 2a side while the side portions 2c and 2d of the bag 2A are folded. By simply lowering and raising the upper and lower blades 18A, 18B of the folding guide 18, the portions near the bottom 2a of the side portions 2c, 2d of the bag are not folded into an accurate shape, so these blades remain in the folded state. The corners are folded into an accurate shape by moving 18A and 18B to the bottom 2a side.

  After the two side portions 2c and 2d of the bag 2A are accurately folded up to the bottom surface 2a side, the shape of the side seals 2c and 2d of the bag 2A is accurately folded at the point seal portion S by the opening flapper 16 and the folding guide 18. Keep point seals. The bottom surface 2a of the bag 2A and the portion close to the bottom 2a folded to the inside of the side surfaces 2c and 2d are sandwiched between the heater portions 58a and 58b of the point seal member 58 and the end surface of the folding guide 18 and welded. By performing point sealing in this way, it is possible to maintain the folded state of the side portion of the bag 2A. The step of moving the opening flapper 16 and the folding guide 18 to the bottom 2a of the bag 2A and the point sealing step are performed at position C in FIG.

  After point sealing is performed on the bottom 2a of the bag 2A, the folding guide 18 is retracted, and then the opening flapper 16 is retracted (see FIG. 5). Thereafter, the external inspection is performed by the external inspection sensor 60 at the external inspection station K, and the folding process of the bag 2B is completed. The step of retracting the folding guide 18 and the opening flapper 16 and the outer shape inspection are performed at the position D in FIG. After the folding process of the bag 2B is completed, the upper and lower blades 18A, 18B of the folding guide 18 are raised and lowered respectively to be extracted from the bag 2B, and then the positioning gripper 20 is opened. Thereafter, the folded bag 2B covered with the opening flapper 16 is gripped by the bag take-out means 62 (discharge gripper) and moved in the horizontal direction to take out the bag 2B from the opening flapper 16. The step of taking out and discharging the bag 2A by the take-out means 62 is performed at the position E in FIG.

  In the above-described embodiment, the bag 2A is centered by expanding the opening flapper 16 inserted into the bag 2A. However, the bag 2A can be centered in another process. For example, the bag 2A is covered with the opening flapper 16 by the supply gripper 14, the bag 2A is positioned by the positioning gripper 20, and then the pair of plate-like members 16A and 16B of the opening flapper 16 are expanded. As shown in FIG. 2, the bag 2A is expanded to such an extent that no tension is applied. After opening the positioning gripper 20 in this state, the upper and lower folding guides 18 are brought close to each other and the opening flapper 16 is closed to center the bag 2A during the folding operation of the bag 2A. Then, after the positioning gripper 20 is closed again, the next step is performed.

  FIG. 11 is a view for explaining a manufacturing process by the folding bag manufacturing apparatus according to the second embodiment. At the position AX in the figure, the bag 2A is covered with the opening flapper 16, and the positioning gripper 20 grips the bag 2A. After that, the opening flapper 16 is opened with a slight clearance. Next, at the BX position, the positioning gripper 20 is opened, the folding guide 18 is approached while the opening flapper 16 is closed, and the bag 2A is centered and the gusset is folded. Thereafter, the bag 2 </ b> A is clamped again by the positioning gripper 20. In each of the positions C, D, and E in FIG. 11, the same process as in the first embodiment is performed.

2 sheet 2A bag 2B bag (folding bag)
2b Bag opening 2c Bag side surface 2d Bag side surface 8A Folding means (Folding roller)
8B Folding means (Folding roller)
10 Seal cutting means 16A Plate member (opening flapper)
16B Plate member (opening flapper)
18 Folding guide 30 Opening / closing means (opening / closing cylinder)
32 Opening and closing means (opening and closing cylinder)
34 Moving means (lifting cylinder)
36 Moving means (lifting cylinder)

Claims (9)

  Two-folding means for folding the sheet in half along the longitudinal direction, and seal-cutting means for creating a bag with one end opened by sealing cutting in a direction transverse to the longitudinal direction of the folded sheet, A pair of plate-like members inserted inside from the opening of the bag, an opening / closing means for opening and closing the pair of plate-like members, a pair of folding guides movable from both side surfaces of the bag to the inside, and both folding And moving means for approaching and separating the guide. After opening the pair of plate-like members inserted into the bag, the pair of plate-like members are closed and the folding guide is brought close to the side surface of the bag. Folding bag manufacturing apparatus characterized by folding a bag.   2. The folding bag manufacturing apparatus according to claim 1, further comprising clamp means for clamping the bag so as to avoid a portion where the plate-like member of the bag is inserted, and positioning the bag.   The folding bag manufacturing apparatus according to claim 1 or 2, further comprising an advancing / retreating means for advancing / retreating the plate-like member from the opening side to the bottom side of the bag.   The folding bag manufacturing apparatus according to any one of claims 1 to 3, further comprising an advancing / retreating means for advancing / retreating the folding guide from the bag opening side to the bottom side.   The folding bag manufacturing apparatus according to any one of claims 1 to 4, further comprising point seal means for sealing a bottom surface and a part of a side surface of the bag in which both side surfaces are folded.   A step of forming a bag with one end opened by folding the sheet in half along the longitudinal direction and sealing cutting in a direction transverse to the longitudinal direction; and a pair of plate-like members from the opening end of the bag Inserting the bag into the bag, expanding the plate-shaped member to expand the bag, bringing the plate-shaped member closer together, and inserting a pair of folding guides between the pair of plate-shaped members from both sides of the bag And a step of folding the side surface of the bag by moving the bag to the folded bag manufacturing method. The method for manufacturing a folding bag according to claim 6 , further comprising a step of clamping and positioning a portion of the bag avoiding the plate-like member after the step of spreading the plate-like member to expand the bag. After the step of folding the sides of the bag by folding guide, comprising: the step of moving the plate-like member on the bottom side of the open end opposite the bag, and moving the guide narrowing folding the direction toward the bottom surface of the bag The manufacturing method of the folding bag of Claim 6 or Claim 7 . The guide narrowing folding said after moving direction toward the bottom surface of the bag, a manufacturing method of folding bag according to claim 8, characterized in that it comprises a step of sealing a portion of the side surface which is folded on the bottom surface and inner bag.

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