Bag making machine and bag making method

Abstract

To provide a seal device assembled with a plurality of seal units for processing the same seal portion, capable of easily controlling dislocation of a film without human intervention.SOLUTION: A bag making machine for manufacturing a packaging bag having one or more of seal portions from a belt-like film is assembled with a transport device for transporting a film F in its longer direction and one or more seal devices for sealing the film F in every seal portion, wherein any of the seal device is a first seal device 100 which includes a plurality of seal units 101 for processing the same seal portion, a motor M for changing a position in the longer direction toward any of the plurality of seal units 101, and a detection device 103 for detecting a mark 102 given to the film F, and is capable of setting different position change amounts to different seal units 101.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a bag making machine and a bag making method. [Background technology]

[0002] As an apparatus for continuously manufacturing a plurality of packaging bags, for example, Patent Document 1 describes a bag making apparatus that marks a continuous strip-shaped film, conveys the film intermittently, seals the film at a predetermined position, and then cuts the film. Patent Document 1 describes that the drive of a roller feed device for the film is controlled based on a signal that detects the mark on the film. Specifically, when a deviation occurs in the film conveyance pitch, the length of a detour path formed on the film between the sealing device and the roller feed device is adjusted. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-1418 A Summary of the Invention [Problem to be solved by the invention]

[0004] When a sealing device has multiple sealing units for processing the same seal portion, it is necessary to suppress misalignment so that the area where each sealing unit processes the film is within a predetermined tolerance range. However, in a sealing device in which multiple sealing units are arranged in the longitudinal direction of the film, if the film conveyance pitch is misaligned, the amount of positional misalignment differs for each sealing unit, and adjustments by the operator are required.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and has an objective of providing a bag making machine and a bag making method that are capable of easily adjusting misalignment of a film without manual labor in a sealing device equipped with multiple sealing units for processing the same seal portion. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a bag making machine that produces packaging bags having one or more sealed portions from a strip-shaped film, comprising a conveying device that conveys the film in a longitudinal direction and one or more sealing devices that seal the film for each sealed portion, wherein one of the sealing devices is a first sealing device that has a plurality of sealing units for processing the same sealed portion, a motor that changes its position in the longitudinal direction relative to one of the plurality of sealing units, and a detection device that detects a mark affixed to the film, and is capable of setting different position change amounts for different sealing units.

[0007] The apparatus may further include a control device that controls the position using the motor based on a signal obtained when the detection device detects the mark. In the first seal device, the motor and the detection device may be disposed in each of the plurality of seal units.

[0008] The bag making machine may have two or more sealing devices, and a sealing device disposed downstream in the transport direction of the film may be the first sealing device. The bag making machine has a longitudinal sealing device that forms a seal portion around the packaging bag in the longitudinal direction, and a widthwise sealing device that forms a seal portion around the packaging bag in a width direction intersecting the longitudinal direction, and at least one of the longitudinal sealing device or the widthwise sealing device may be the first sealing device.

[0009] The present invention also provides a bag making method for producing a packaging bag having one or more sealed portions from a strip-shaped film, comprising the steps of transporting the film in a longitudinal direction and sealing the film using one or more sealing devices for each of the sealing portions, wherein one of the sealing devices is a first sealing device having a plurality of sealing units for processing the same sealed portion, a motor for changing the longitudinal position relative to one of the plurality of sealing units, and a detection device for detecting a mark affixed to the film, and capable of setting different position change amounts for different sealing units. Effect of the Invention

[0010] According to the present invention, it becomes possible to easily adjust the positional deviation of a film in a sealing device having a plurality of sealing units for processing the same seal portion without requiring manual labor. [Brief description of the drawings]

[0011] [Figure 1] 1 is a conceptual diagram illustrating a bag making machine according to an embodiment; [Diagram 2] 1A is a front view illustrating a packaging bag, and FIG. 1B is a cross-sectional view taken along line SS. [Diagram 3] FIG. 4 is a conceptual diagram illustrating a first sealing device. [Figure 4] FIG. 13 is a conceptual diagram illustrating a positional deviation adjustment device in a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The present invention will be described below based on preferred embodiments with reference to the drawings. Fig. 1 illustrates a conceptual diagram of a bag making machine according to an embodiment. Fig. 2 illustrates (a) a front view and (b) a cross-sectional view along line SS of a packaging bag. Fig. 3 illustrates a conceptual diagram of a first sealing device.

[0013] The bag making machine 20 shown in Fig. 1 is an apparatus that makes packaging bags using strip-shaped films 11, 12 supplied from film supply units 21, 22. An example of a packaging bag made by the bag making machine 20 is the packaging bag 10 shown in Fig. 2(a) and Fig. 2(b). The packaging bag 10 has a body seal unit 14, a bottom seal unit 15, and an attachment seal unit 19 as one or more seal units 14, 15, 19 formed by the bag making machine 20. The periphery of the attachment seal unit 19 may have a cutout portion 19a in which a part of the body film 11 is obliquely removed.

[0014] The illustrated packaging bag 10 is a standing pouch having a bottom film 12 folded in two and disposed between front and rear body films 11, and capable of standing up on its own. The left-right direction in Fig. 2(b) corresponds to the front-rear direction of the packaging bag 10. The upper part of the packaging bag 10 may have an unsealed opening 13 for the purpose of a filling port or the like. The spout 16 is joined to the body film 11 at an attached seal part 19. In the case of the spout 16 in the illustrated example, a tubular part 18 protruding outward from the body film 11 is formed to be thin relative to a base part 17 joined to the attached seal part 19.

[0015] The bag making machine 20 of the embodiment includes, as film supply sections 21, 22, a body film supply section 21 that supplies the body film 11, and a bottom film supply section 22 that supplies the bottom film 12. The body film 11 and bottom film 12 used in the bag making machine 20 are both strip-shaped films 11, 12. When the bag making machine 20 manufactures packaging bags 10 having body films 11 on the front and rear, the body film supply section 21 may supply an original film 11A having a width at least twice that of the body film 11. The original film 11A is cut into a pair of body films 11 by a known bi-leaf forming device 23.

[0016] Although the details of the multi-sheet device 23 are not particularly shown, the original film 11A is divided in the widthwise center using a cutter or the like, and then the pair of body films 11 lined up in the widthwise direction are aligned so that they face each other in the thickness direction and have the same width by, for example, changing the orientation of the pair of body films 11. The body films 11 with both ends in the widthwise direction aligned are guided by guide rolls 24, for example, while leaving a gap in the vertical direction. Thereafter, the upper and lower body films 11 are overlapped in an overlapping device 25.

[0017] Although not specifically shown, the position of at least one of the bodies films 11 may be adjustable in the opposing direction or in the width direction just before overlapping so that the corresponding positions of the bodies films 11 accurately match when the upper and lower bodies films 11 are overlapped by the overlapping device 25. For example, the position of at least one of the guide rolls 24 that guide the bodies film 11 may be made movable in the width direction or in the opposing direction using a moving device (not shown) such as a servo motor.

[0018] The bottom film 12 supplied from the bottom film supply unit 22 is folded in two and sandwiched between the body film 11. The film obtained by overlapping the body film 11 and the bottom film 12 forms the above-mentioned seal portions 14, 15, and 19, and then is cut into individual packaging bags 10 by a cutting device 26.

[0019] When manufacturing a packaging bag 10 having a bottom film 12 between body films 11, the bottom film 12 is arranged so that it is continuous in the longitudinal direction on the bag making machine 20. For this reason, the bottom film 12 is arranged on one or both sides of the width of the body film 11. When the bottom film 12 is arranged on both sides of the width of the body film 11, it is preferable that the width of the body film 11 is at least twice the height of the packaging bag 10. In this case, the opening 13 and the attachment seal portion 19 are formed in the center of the body film 11 in the width direction.

[0020] Bag making machine 20 is equipped with a conveying device 27 to convey films 11, 12 in the longitudinal direction from when they are supplied by film supply units 21, 22 until when they are cut by cutting device 26. In Fig. 1, the upstream side in the conveying direction is the right side in Fig. 1, and the downstream side in the conveying direction is the left side in Fig. 1. Conveying device 27 may be disposed in one location or in two or more locations in the longitudinal direction of bag making machine 20.

[0021] Bag making machine 20 is provided with one or more sealing devices for sealing the film for each sealing portion, such as temporary fixing sealing device 31, attachment sealing device 32, bottom sealing device 33, and body sealing device 34. It is preferable that conveying device 27 conveys films 11, 12 intermittently at a constant cycle so that conveying of films 11, 12 is stopped when sealing films 11, 12 or spout 16.

[0022] Conveying device 27 may be configured to sandwich the film between a pair of conveying rollers and convey the film as the conveying rollers rotate. Alternatively, clamping bars may be arranged in the width direction of the film, and the film may be moved together with the clamping bars in a state in which the film is sandwiched between the pair of clamping bars. The conveying rollers may be capable of continuous conveyance, but when conveyance is performed intermittently, the conveying rollers may be stopped when the film conveyance is paused.

[0023] Although not specifically shown, in the process of unwinding original film 11A from body film supply section 21 or in the process of compounding original film 11A into a pair of body films 11, these films 11, 11A may be made capable of being transported by continuous feeding. In order to realize continuous transport on the upstream side of films 11, 11A and intermittent transport on the downstream side, a buffer section (not shown) such as a dancer roll may be provided at a location where the transport method is changed. In the buffer section, the film can be guided so that it meanders to one side or both sides with respect to the transport direction, forming a variable amount of buffer.

[0024] The temporary fixing sealing device 31 temporarily fixes the spout 16 to at least one of the multiple body films 11. The installation sealing device 32 forms an installation seal portion 19 for joining the spout 16 between the body films 11. The bottom sealing device 33 joins the bottom film 12 to the body film 11 to form the bottom seal portion 15. The body sealing device 34 joins opposing body films 11 to form the body seal portion 14.

[0025] The temporary fixing sealing device 31 may include a preheating device 31a, a forming device 31b, a cutting device 31c, and a temporary fixing device 31d. The preheating device 31a can preheat the area of ​​the body film 11 where the spout 16 is to be attached. The forming device 31b can form the area of ​​the body film 11 where the spout 16 is to be attached into a concave shape by vacuum forming, compressed air forming, plug forming, or the like. The preheating device 31a and the forming device 31b need only process at least one of the body films 11, but it is preferable that they process the body film 11 on both sides of the spout 16.

[0026] Cutting device 31c can form a slit (not shown) in body film 11 that corresponds to cutout 19a or a part of it. Forming a slit in body film 11 makes it easier to supply spout 16 to body film 11. Cutting device 31c only needs to form a slit in at least one of body films 11, but preferably forms slits in body film 11 on both sides of spout 16. Cutting device 31c may also form slits that penetrate opposing body films 11 at the same position.

[0027] The temporary fixing device 31d can temporarily fix the spout 16 to at least one of the body films 11 in an area smaller than the attached seal portion 19, like a point seal or the like. The spout 16 in the temporary fixing sealing device 31 is placed between a pair of body films 11 or at a predetermined position relative to at least one of the body films 11, using a spout insertion device such as a parts feeder or a belt conveyor. The temporary fixing sealing device 31 is placed upstream of the attached sealing device 32 in order to temporarily fix the spout 16 before forming the attached seal portion 19.

[0028] When the temporary sealing device 31 is disposed after the pair of body films 11 have been overlapped by the joining device 25, the spout 16 can be inserted between the pair of body films 11 through the above-mentioned slit corresponding to the notch 19a. Even if the packaging bag 10 does not have the notch 19a, a slit can be formed in the body film 11 in the marginal area between adjacent packaging bags 10 in the longitudinal or width direction, and the spout 16 can be inserted through this slit. The marginal area is removed when the packaging bag 10 is cut by the cutting device 26.

[0029] Furthermore, when bottom film 12 is arranged on only one side of body film 11 in the width direction, spout 16 may be inserted from the side of body film 11 in the width direction where bottom film 12 is not arranged. In this case, spout 16 can be arranged on body film 11 even without the above-mentioned cut, so cutting device 31c can be omitted.

[0030] Alternatively, forming device 31b and temporary fixing device 31d may be arranged before the body films 11 are overlapped by overlapping device 25, and with a gap between the body films 11 above and below, a recess may be formed in at least one of the body films 11, and the spout 16 may be temporarily fixed to the body film 11 on one side. In this case, since the spout 16 can be arranged on the body film 11 even without the above-mentioned cut, cutting device 31c can be omitted. In this case, preheating device 31a may be arranged upstream of forming device 31b, at a location where the body films 11 have been spaced apart, or may be arranged before the body films 11 are spaced apart.

[0031] The mounting seal device 32 has a plurality of mounting seal units 32a, 32b, 32c, and 32d. For example, the upstream mounting seal units 32a, 32b, and 32c may be heating devices, and the downstream mounting seal unit 32d may be a cooling device. The cooling device may be omitted, and each of the bottom seal units 33a and 33b may be a heating device.

[0032] The heating device used in the fitting and sealing device 32 bonds the body film 11 and the spout 16 by heating the inner surface of the body film 11 or part of the outer surface of the spout 16 with the spout 16 sandwiched between the body films 11. The cooling device used in the fitting and sealing device 32 can more reliably fit the spout 16 to the body film 11 by sandwiching and cooling the heated body film 11 and spout 16 between a metal mold or the like.

[0033] The bottom sealing device 33 has a plurality of bottom sealing units 33a, 33b. These bottom sealing units 33a, 33b may be heating devices. Alternatively, the upstream bottom sealing unit 33a may be a heating device, and the downstream bottom sealing unit 33b may be a cooling device. The heating device heats the films 11, 12 while the bottom film 12 is sandwiched between the body films 11, forming the bottom seal portion 15. The cooling device can more reliably bond the films 11, 12 by sandwiching the heated films 11, 12 between dies or the like and cooling them.

[0034] The attachment seal unit 19, which is the processing target of the temporary seal device 31 and the attachment seal device 32, is located at the top of the packaging bag 10, while the bottom seal unit 15, which is the processing target of the bottom seal device 33, is located at the bottom of the packaging bag 10. Since the attachment seal unit 19 and the bottom seal unit 15 are positioned apart in this way, the range of the bottom seal device 33 in the longitudinal direction of the body film 11 may overlap with the range of the temporary seal device 31 or the attachment seal device 32. In addition, the bottom seal device 33 may be located either upstream or downstream of the temporary seal device 31 and the attachment seal device 32.

[0035] The temporary sealing device 31 or the attachment sealing device 32 can also be used when joining accessories such as tubes, straws, attachments, etc. to the body film 11 of the packaging bag 10 instead of the spout 16. It is also possible to omit the temporary sealing process in the process of joining accessories such as the spout 16 to the body film 11. For example, an accessory such as the spout 16 may be positioned at a predetermined position on the body film 11 using an adhesive, a tool, a jig, etc.

[0036] The body sealing device 34 has multiple body sealing units 34a, 34b, 34c, 34d, and 34e. These body sealing units 34a, 34b, 34c, 34d, and 34e may be heating devices. The upstream body sealing unit may be a heating device, and the downstream body sealing unit may be a cooling device. The heating device heats the body film 11 and forms the body seal portion 14. The cooling device can more reliably bond the body film 11 by sandwiching the heated body film 11 between a metal mold or the like and cooling it.

[0037] The body sealing device 34 may be disposed upstream of the bottom sealing device 33, or may be disposed downstream of the bottom sealing device 33. The packaging bag 10 shown in Fig. 2(a) has two types of body sealing portions 14, such as the left body sealing portion 14 that overlaps with the attached seal portion 19, and the right body sealing portion 14 that does not overlap with the attached seal portion 19. The two types of body sealing portions 14 may be formed by the same body sealing device 34, or may be formed by different body sealing devices 34.

[0038] When the left and right body seal portions 14 are formed by the same body sealing device 34, the body sealing device 34 forms the body seal portion 14 with a seal width equal to or greater than the combined seal width of the left body seal portion 14 and the right body seal portion 14. When the cutting device 26 subsequently cuts the packaging bag 10, it can separate the body seal portion 14 of the packaging bag 10 on the upstream side from the body seal portion 14 of the packaging bag 10 on the downstream side.

[0039] Bag making machine 20 is configured as a first sealing device in which any one of the sealing devices can set different position change amounts for different sealing units. As shown in Fig. 3, first sealing device 100 has a plurality of sealing units 101 for processing the same seal portion, a motor M for changing the longitudinal position of any one of the plurality of sealing units 101, and a detection device 103 for detecting a mark 102 affixed to film F.

[0040] When multiple sealing units 101 process the same seal portion, it is desirable that the areas (processing areas) where the film F is processed are sufficiently aligned. If there is a misalignment in the conveying pitch of the film F, the positions where the multiple sealing units 101 process the film F may not match the positions of the specified seal portions. For this reason, it is necessary to adjust the positions of the sealing units 101 in the longitudinal direction.

[0041] Examples of processing of the seal portion include heating the film F, cooling the film F, shaping the film F, cutting the film F, and inserting parts such as a spout into the film F. The same seal portion is not limited to the case where the processing areas are repeatedly aligned, but may also be the case where the processing areas overlap or are adjacent to each other. A process of processing another area may be interposed between each process of processing the same seal portion.

[0042] For example, as a comparative example, as shown in Fig. 4, a detection device 103 may be installed at a specific position in the longitudinal direction of the film F, a mark 102 on the film F may be detected by the detection device 103 to calculate the conveying pitch of the film F by the conveying device 27, and the positional deviation of each sealing unit 101 may be estimated from the deviation of the conveying pitch. In this case, it may be possible to set the same position change amount for all sealing units 101. It may also be possible to estimate the deviation amount of each sealing unit 101 according to the distance in the longitudinal direction between the detection device 103 and each sealing unit 101, and to set a position change amount having a certain relationship based on a single measurement value of the detection device 103.

[0043] However, when the distance from the detection device 103 to the sealing unit 101 is large, adjustment can be difficult because the actual positional deviation of each sealing unit 101 differs from the estimated amount. Also, if it is assumed that the amount of deviation changes linearly (linearly) with respect to the distance, it is possible to adjust the positional deviation of each sealing unit 101 using a collective adjustment device 105 using a moving means such as a servo motor or a rack-and-pinion gear. However, it can be difficult to adjust the position of the sealing unit 101 as desired due to backlash of the moving means, etc.

[0044] In the case of the bag making machine 20 of the embodiment, the first sealing device 100 can set different position change amounts for the different sealing units 101. Furthermore, it is possible to set different position change amounts for the different sealing units 101 based on different measured values ​​using the detection devices 103 at two or more locations. Therefore, even if a different amount of positional misalignment adjustment is required for each sealing unit 101, it is possible to operate a different motor M for each sealing unit 101 and adjust the positional misalignment individually. The detection device 103 detects the mark 102, so that the position of each sealing unit 101 can be automatically adjusted, thereby reducing the need for manual adjustment by a worker such as an operator.

[0045] Moreover, in the first sealing device 100, it is preferable to install different detection devices 103 for different sealing units 101. This makes it possible to more accurately detect the actual amount of positional misalignment in each sealing unit 101. The amount of positional misalignment is detected by, for example, calculating the average conveying pitch at the position of the detection device 103 from the results of detecting the mark 102 over a predetermined number of times, about 4 to 30 shots, and when an amount of positional misalignment exceeding an allowable range is detected, the motor M is operated to adjust the position of the sealing unit 101.

[0046] The allowable range of the amount of positional misalignment in the longitudinal direction is, for example, about 0.1 to 1.0 mm. The positions of all of the seal units 101 included in the first sealing device 100 may be adjusted simultaneously, or the positions of only the seal units 101 that require positional misalignment adjustment may be adjusted.

[0047] In order to change the position of each sealing unit 101, it is preferable to provide at least one motor M for each sealing unit 101. The motor M is not particularly limited as long as it is a power generator or power source, but an electric motor is preferable, and a servo motor is particularly preferable. When there are many sealing units 101, a small number of adjacent sealing units 101 may be grouped, and a motor M may be provided for each group.

[0048] The detection device 103 is not particularly limited, and examples thereof include a camera, a phototube, and an optical sensor. The detection device 103 may be built into each sealing unit 101. The detection device 103 may be disposed near the sealing unit 101. Since the distance between the detection device 103 and the sealing unit 101 that adjusts the positional deviation based on the detection result of the detection device 103 is small, errors can be suppressed. If the mark 102 can be detected with visible light, the worker can visually confirm the mark 102. The mark 102 that is detected using invisible light such as ultraviolet light may be used.

[0049] A detection device 103 may be provided for each of the sealing units 101 included in the first sealing device 100. When there are a large number of sealing units 101, a small number of adjacent sealing units 101 may be grouped and a detection device 103 may be provided for each group. Providing multiple detection devices 103 in the first sealing device 100 enables highly accurate positional deviation adjustment compared to the case where one detection device 103 is used for all sealing units 101.

[0050] Regarding the arrangement of the motor M or the detection device 103, when the sealing units 101 included in the first sealing device 100 are grouped, the number of sealing units 101 included in each group may be, for example, about 2 to 3. The grouping regarding the arrangement of the motor M and the grouping regarding the arrangement of the detection device 103 may be the same or different. A motor M may be arranged for each sealing unit 101, and a detection device 103 may be arranged for each group including a plurality of sealing units 101. A motor M may be arranged for each group including a plurality of sealing units 101, and a detection device 103 may be arranged for each sealing unit 101.

[0051] The first sealing device 100 preferably utilizes a control device 104 to control the position of the sealing unit 101 using the motor M based on a signal obtained by the detection device 103 detecting the mark 102. The control device 104 is not particularly limited, but examples thereof include electronic devices such as a CPU (central processing unit) and an IC (integrated circuit), or a microcontroller or computer having these.

[0052] The control device 104 may be provided exclusively for the first sealing device 100, or may be shared with a control device related to control of other functions in the bag making machine 20. The control device 104 may be provided exclusively for the bag making machine 20, or may be shared with a control device related to control of other machinery. Two or more bag making machines 20 may share the control device 104. A control device of a facility in which the bag making machine 20 is installed may also serve as the control device 104 of the first sealing device 100. When the bag making machine 20 has two or more first sealing devices 100, a separate control device 104 may be provided for each first sealing device 100, or a common control device 104 may be used for the two or more first sealing devices 100.

[0053] The communication path used for transmitting or receiving signals between the control device 104 and the detection device 103 or the motor M may be wireless or wired. The communication path may be arranged exclusively for the bag making machine 20, or may be shared with other communication purposes in the facility in which the bag making machine 20 is installed. The control device 104 may comprehensively control multiple machines within a facility such as a factory. The communication path may use, for example, a local or wide-area communication network using a wireless LAN, a communication cable, or the like. The control device 104 may control the operation of the bag making machine 20 from outside the facility such as a factory. The communication path may be connected to a public communication network such as the Internet, a mobile phone network, or a telephone line.

[0054] When the bag making machine 20 has two or more sealing devices, it is preferable to employ the first sealing device 100 for at least one of the sealing devices. For example, the first sealing device 100 may be employed for one or both of the bottom sealing device 33 and the body sealing device 34. The first sealing device 100 may be employed for the temporary attachment sealing device 31 or the attachment sealing device 32. The bag making machine 20 may have a sealing device (second sealing device) other than the first sealing device 100. The structure, specifications, etc. of the first sealing device 100 may differ for each sealing section.

[0055] When a deviation occurs in the conveying pitch, the deviation accumulates in the longitudinal direction, and the positional deviation tends to become more pronounced at positions farther from the film supply sections 21, 22. From this perspective, it is preferable that the sealing device arranged downstream of the conveyance of film F be the first sealing device 100. In the case of the arrangement shown in FIG. 1, it is preferable that the body sealing device 34 arranged at the most downstream position be the first sealing device 100. In addition, it is preferable that the bottom sealing device 33 arranged next downstream be the first sealing device 100. The temporary fixing sealing device 31 or the attachment sealing device 32 arranged further upstream may not be the first sealing device 100, and a simpler device may be adopted.

[0056] When the packaging bag 10 is surrounded by a sealed portion, the bag making machine 20 preferably includes a longitudinal sealing device that forms a sealed portion in the longitudinal direction, and a widthwise sealing device that forms a sealed portion in the widthwise direction intersecting the longitudinal direction. By separately forming the longitudinal sealed portion and the widthwise sealed portion, it becomes easier to design the molds such as the seal bar and the seal roll used to form each sealed portion, and it becomes easier to tolerate positional errors at the intersection points of the two. From this viewpoint, it is preferable that at least one of the longitudinal sealing device and the widthwise sealing device is the first sealing device 100. In the bag making machine 20 shown in FIG. 1, when the packaging bag 10 shown in FIG. 2(a) and FIG. 2(b) is manufactured, the body sealing device 34 is the widthwise sealing device, and the bottom sealing device 33 is the longitudinal sealing device.

[0057] According to the bag making machine 20 and the manufacturing method for the packaging bag 10 of the embodiment, in the first sealing device 100 having a plurality of sealing units 101 for processing the same seal portion, the positional deviation of the film F in the longitudinal direction can be easily adjusted without manual labor. This suppresses the occurrence of defects in the packaging bag 10 and reduces the burden on the worker of monitoring and adjusting the bag making machine 20. This improves productivity and operability and facilitates labor and manpower saving.

[0058] The present invention has been described above based on a preferred embodiment, but the present invention is not limited to the above-mentioned embodiment, and various modifications are possible without departing from the gist of the present invention.

[0059] The film F may be a single layer film, a multilayer film, a resin film, a composite film, or a soft and flexible sheet or web, etc. A laminate having a sealant on at least one side is preferable, and examples thereof include a laminate film having a polyolefin resin layer such as polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate copolymer (EVA), or a cyclic olefin resin as the innermost layer (sealant), and a stretched film such as a biaxially oriented nylon film, a biaxially oriented polyethylene terephthalate film, or a biaxially oriented polypropylene film as the base material.

[0060] Film F may have, as necessary, an ethylene-vinyl alcohol copolymer, a vapor-deposited layer of a metal or an inorganic compound, a metal foil such as aluminum foil, a paper layer, a cellophane layer, a nonwoven fabric layer, a printed layer, an adhesive layer, etc. The films are preferably bonded together by welding using a sealant, etc. The materials and thicknesses of the films may be the same or different from each other.

[0061] The spout 16 preferably has a thermoplastic resin that can be welded to the film F. The entire spout 16 may be formed from a thermoplastic resin, or may have a thermoplastic resin layer at least on the surface. The thermoplastic resin is not particularly limited, but examples thereof include polyesters such as polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate copolymer (EVA), and polyethylene terephthalate (PET), polyamides such as nylon, adhesive polyolefins, cyclic polyolefins, and polybutylene.

[0062] The packaging bag 10 manufactured by the bag making machine 20 is not limited to the packaging bag 10 shown in Figures 2(a) and 2(b), and can be applied to other packaging bags and packaging containers. The bottom film 12 may be omitted from the packaging bag 10 to manufacture a flat bag. Instead of the compounding device 23 dividing the original film 11A into a pair of body films 11, the original film 11A may be folded in half to form the front and rear surfaces of the body film 11. The folded films to be placed on the left and right of the packaging bag may be placed on both sides of the body film 11 in the width direction in the same manner as the bottom film 12 to manufacture a gusset bag. [Explanation of symbols]

[0063] F...film, M...motor, 10...packaging bag, 11...body film, 11A...raw film, 12...bottom film, 13...opening, 14...body seal section, 15...bottom seal section, 16...spout, 17...base, 18...tube section, 19...attachment seal section, 19a...notch, 20...bag making machine, 21...body film supply section, 22...bottom film supply section, 23...compounding device, 24...guide roll, 25...alignment device, 26...cutting device, 27...conveyor device, 31...temporary sealing device, 3 1a...preheating device, 31b...forming device, 31c...cutting device, 31d...temporary fastening device, 32...fitting and sealing device, 32a, 32b, 32c, 32d...fitting and sealing unit, 33...bottom sealing device, 33a, 33b...bottom sealing unit, 34...body sealing device, 34a, 34b, 34c, 34d, 34e...body sealing unit, 100...first sealing device, 101...sealing unit, 102...mark, 103...detection device, 104...control device, 105...collective adjustment device.

Claims

1. A bag making machine that produces a packaging bag having one or more seal portions from a strip-shaped film, A conveying device that conveys the film in a longitudinal direction; one or more sealing devices for sealing the film at each of the sealing portions; The belt-like films are a body film and a bottom film, and the pair of body films are aligned so as to face each other in the thickness direction with the same width, The bottom film is folded in half and sandwiched between the pair of body films, and is arranged so as to be continuous in the longitudinal direction on one or both of the width directions of the body films, The bottom sealing device that joins the bottom film to the body film to form a bottom seal portion is a longitudinal sealing device that forms a seal portion in the longitudinal direction around the periphery of the packaging bag, and has a plurality of bottom sealing units, The body sealing device that joins the body film to form the body seal portion is a width direction sealing device that forms a seal portion in the width direction intersecting the longitudinal direction around the periphery of the packaging bag, and has a plurality of body seal units, The longitudinal seal portion and the width seal portion have an intersection point, A bag making machine characterized in that both the bottom sealing device and the torso sealing device have a plurality of sealing units for processing the same seal portion, a motor that changes the longitudinal position relative to any of the plurality of sealing units, and a detection device that detects a mark affixed to the film, and are first sealing devices that can set different position change amounts for different sealing units.

2. 2. The bag making machine according to claim 1, further comprising a control device that controls the position by using the motor based on a signal obtained by the detection device detecting the mark.

3. 3. The bag making machine according to claim 1, wherein in the first sealing device, the motor and the detection device are provided for each of the plurality of sealing units.

4. The bag making machine according to any one of claims 1 to 3, characterized in that, among the three or more sealing devices in the bag making machine, the sealing device arranged downstream of the film conveyance is the first sealing device.

5. A bag making method for producing a packaging bag having one or more seal portions from a strip-shaped film, comprising the steps of: The film is transported in a longitudinal direction; sealing the film with one or more sealing devices for each of the seal portions; The belt-like films are a body film and a bottom film, and the pair of body films are aligned so as to face each other in the thickness direction with the same width, The bottom film is folded in half and sandwiched between the pair of body films, and is arranged so as to be continuous in the longitudinal direction on one or both of the width directions of the body films, The bottom sealing device that joins the bottom film to the body film to form a bottom seal portion is a longitudinal sealing device that forms a seal portion in the longitudinal direction around the periphery of the packaging bag, and has a plurality of bottom sealing units, The body sealing device that joins the body film to form the body seal portion is a width direction sealing device that forms a seal portion in the width direction intersecting the longitudinal direction around the periphery of the packaging bag, and has a plurality of body seal units, The longitudinal seal portion and the width seal portion have an intersection point, A bag making method characterized in that both the bottom sealing device and the torso sealing device have a plurality of sealing units for processing the same seal portion, a motor that changes the longitudinal position relative to any of the plurality of sealing units, and a detection device that detects a mark affixed to the film, and are first sealing devices that can set different position change amounts for different sealing units.

Images