JP7637494B2 - Bag making machine and bag making method - Google Patents

Description

The present invention relates to a bag making machine and a bag making method.

For example, Patent Document 1 describes a bag making device that applies a mark to a continuous strip of film, transports it intermittently, seals the film at a predetermined position, and then cuts it, as an apparatus for continuously manufacturing multiple packaging bags. Patent Document 1 describes that the drive of a film roller feed device is controlled based on a signal that detects the mark applied to the film. Specifically, if a deviation occurs in the film transport pitch, the length of the detour path formed on the film between the sealing device and the roller feed device is adjusted.

JP 2001-1418 A

When a sealing device has multiple sealing units for processing the same seal portion, it is necessary to suppress misalignment so that the area of the film processed by each sealing unit falls within a specified tolerance range. However, in a sealing device in which multiple sealing units are arranged in the longitudinal direction of the film, if the film transport pitch is misaligned, the amount of positional misalignment differs for each sealing unit, requiring adjustment by the operator.

The present invention was made in consideration of the above circumstances, and aims to provide a bag making machine and bag making method that can easily adjust the positional misalignment of the film without manual labor in a sealing device equipped with multiple sealing units for processing the same seal portion.

To solve the above problem, the present invention provides a bag making machine that produces packaging bags having one or more seal portions from a strip-shaped film, comprising a conveying device that conveys the film in the longitudinal direction, and one or more sealing devices that seal the film for each seal portion, and characterized in that one of the sealing devices is a first sealing device that has multiple sealing units for processing the same seal portion, a motor that changes the longitudinal position of one of the multiple sealing units, and a detection device that detects a mark on the film, and that can set different position change amounts for different sealing units.

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 arranged in each of the plurality of seal units.

The bag making machine may have two or more sealing devices, and a sealing device disposed downstream in the film transport direction 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.

The present invention also provides a bag making method for producing a packaging bag having one or more seal portions from a strip-shaped film, the method comprising: conveying the film in the longitudinal direction; sealing the film using one or more sealing devices for each seal portion; and a first sealing device, one of which has a plurality of sealing units for processing the same seal portion, a motor for changing the longitudinal position of one of the plurality of sealing units, and a detection device for detecting a mark on the film, and capable of setting different amounts of position change for different sealing units.

According to the present invention, it is possible to easily adjust the positional misalignment of a film in a sealing device equipped with multiple sealing units for processing the same seal portion without manual labor.

1 is a conceptual diagram illustrating a bag making machine according to an embodiment; 1A is a front view illustrating a packaging bag, and FIG. 1B is a cross-sectional view taken along line S-S. FIG. 4 is a conceptual diagram illustrating a first sealing device. FIG. 13 is a conceptual diagram illustrating a positional deviation adjustment device in a comparative example.

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

The bag making machine 20 shown in FIG. 1 is a device that produces packaging bags using strip-shaped films 11, 12 supplied from film supply units 21, 22. An example of a packaging bag produced 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 portion of the body film 11 is removed obliquely.

The illustrated packaging bag 10 is a standing pouch in which a bottom film 12 folded in half is placed between front and rear body films 11 and has self-supporting properties. 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 the attached seal portion 19. In the case of the spout 16 in the illustrated example, the tubular portion 18 protruding outward from the body film 11 is formed narrower than the base portion 17 joined to the attached seal portion 19.

The bag making machine 20 of the embodiment includes film supply sections 21, 22, which are 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 a packaging bag 10 having body films 11 at the front and rear, the body film supply section 21 may supply a raw film 11A having a width at least twice that of the body film 11. The raw film 11A is divided into a pair of body films 11 by a known compounding device 23.

Details of the compounding device 23 are not shown, but the original film 11A is divided in the center in the width direction using a cutter or the like, and then the pair of body films 11 aligned in the width direction can be aligned so that they face each other in the thickness direction with the same width by changing the orientation of the pair of body films 11. The body films 11 with both ends aligned in the width direction are guided by guide rolls 24, for example, while leaving a gap in the vertical direction. After that, the upper and lower body films 11 are overlapped in the overlapping device 25.

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

The bottom film 12 supplied from the bottom film supply unit 22 is folded in half and sandwiched between the body film 11. The film made 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 the cutting device 26.

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. Therefore, 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 width of the body film 11.

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

The bag making machine 20 is equipped with one or more sealing devices for sealing the film at each sealing section, including a temporary fixing sealing device 31, a mounting sealing device 32, a bottom sealing device 33, and a body sealing device 34. It is preferable that the conveying device 27 conveys the films 11, 12 intermittently at a constant cycle so that the conveying of the films 11, 12 is stopped when sealing the films 11, 12 or the spout 16.

The transport device 27 may be configured to sandwich the film between a pair of transport rollers and transport the film as the transport rollers rotate. Alternatively, a clamping bar may be arranged in the width direction of the film, and the film may be moved together with the clamping bar while the film is sandwiched between the pair of clamping bars. The transport rollers can transport continuously, but when transporting intermittently, the transport rollers may be stopped when the film transport is paused.

Although not specifically shown, in the process of unwinding the original film 11A from the body film supply section 21 or in the process of compounding the original film 11A into a pair of body films 11, these films 11, 11A may be made to be transportable by continuous feeding. In order to achieve continuous transport on the upstream side of the films 11, 11A and intermittent transport on the downstream side, a buffer section (not shown) such as a dancer roll may be provided at the 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 of the transport direction, forming a variable amount of buffer.

The temporary fixing sealing device 31 temporarily fixes the spout 16 to at least one of the multiple-sheet body films 11. The installation sealing device 32 forms an installation seal section 19 to join 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 section 15. The body sealing device 34 joins opposing body films 11 to form the body seal section 14.

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 attached. The forming device 31b can form the area of the body film 11 where the spout 16 is attached into a concave shape by vacuum forming, pressure 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 to process the body film 11 on both sides of the spout 16.

The cutting device 31c can form a slit (not shown) in the body film 11 that corresponds to the notch 19a or a part of it. Forming a slit in the body film 11 makes it easier to supply the spout 16 to the body film 11. The cutting device 31c may form a slit in at least one of the body films 11, but it is preferable to form slits in the body film 11 on both sides of the spout 16. The cutting device 31c may form a slit so that it penetrates opposing body films 11 at the same position.

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, such as a point seal. The spout 16 in the temporary fixing sealing device 31 is placed at a predetermined position between a pair of body films 11 or with respect to at least one of the body films 11, using a spout insertion device such as a parts feeder or belt conveyor. The temporary fixing sealing device 31 is placed upstream of the attached seal device 32 in order to temporarily fix the spout 16 before forming the attached seal portion 19.

When the temporary sealing device 31 is placed after the pair of body films 11 are overlapped by the alignment 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.

In addition, if the bottom film 12 is placed on only one side of the width of the body film 11, the spout 16 may be inserted from the side of the width of the body film 11 where the bottom film 12 is not placed. In this case, the spout 16 can be placed on the body film 11 even without the above-mentioned cut, so the cutting device 31c can be omitted.

Also, the forming device 31b and the temporary fixing device 31d may be arranged before the body films 11 are overlapped by the overlapping device 25, and with the body films 11 spaced apart 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, the spout 16 can be arranged on the body film 11 even without the above-mentioned cut, so the cutting device 31c can be omitted. In this case, the preheating device 31a may be arranged upstream of the forming device 31b, at the location where the body films 11 are spaced apart, or before the body films 11 are spaced apart.

The mounting seal device 32 has multiple 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 bottom seal unit 33a and 33b may be a heating device.

The heating device used in the attachment and sealing device 32 bonds the body film 11 and the spout 16 by heating the inner surface of the body film 11 or a part of the outer surface of the spout 16 while the spout 16 is sandwiched between the body films 11. The cooling device used in the attachment and sealing device 32 can more reliably attach the spout 16 to the body film 11 by sandwiching the heated body film 11 and spout 16 between a mold or the like and cooling them.

The bottom sealing device 33 has multiple 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.

The attached seal section 19, which is the processing target of the temporary seal device 31 and the attached seal device 32, is located at the top of the packaging bag 10, and the bottom seal section 15, which is the processing target of the bottom seal device 33, is located at the bottom of the packaging bag 10. Since the attached seal section 19 and the bottom seal section 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 attached 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 attached seal device 32.

The temporary sealing device 31 or the mounting 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, the accessory such as the spout 16 may be positioned at a predetermined position on the body film 11 using adhesives, tools, jigs, etc.

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 join the body film 11 by sandwiching the heated body film 11 between a metal mold or the like and cooling it.

The body sealing device 34 may be disposed upstream of the bottom sealing device 33, or 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.

When the left and right body seal sections 14 are formed by the same body sealing device 34, the body sealing device 34 forms the body seal section 14 with a seal width equal to or greater than the combined seal width of the left body seal section 14 and the right body seal section 14. Then, when the cutting device 26 cuts the packaging bag 10, it can separate the body seal section 14 of the upstream packaging bag 10 from the body seal section 14 of the downstream packaging bag 10.

The bag making machine 20 is 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, the 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 the film F.

When multiple sealing units 101 process the same seal portion, it is desirable that the areas (processing areas) on the film F that are processed are sufficiently aligned. If there is a misalignment in the transport pitch of the film F, there is a risk that the positions at which the multiple sealing units 101 process the film F will 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.

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 coincident, and 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.

For example, as a contrast, as shown in FIG. 4, a detection device 103 can be installed at a specific position in the longitudinal direction of the film F, and the detection device 103 can detect a mark 102 on the film F to calculate the transport pitch of the film F by the transport device 27, and the positional deviation of each sealing unit 101 can be estimated from the deviation in the transport pitch. In this case, it is also possible to set the same position change amount for all sealing units 101. It is also possible to estimate the deviation amount for each sealing unit 101 according to the longitudinal distance 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.

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 distance, it is possible to adjust the positional deviation of each sealing unit 101 using a collective adjustment device 105 that uses 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 in the moving means, etc.

In the case of the bag making machine 20 of the embodiment, the first sealing device 100 can set different position change amounts for different sealing units 101. Furthermore, it is possible to set different position change amounts for different sealing units 101 based on different measured values using two or more detection devices 103. Therefore, even if different amounts of positional misalignment adjustment are 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 an operator or other worker.

In addition, it is preferable that the first sealing device 100 has different detection devices 103 installed for different sealing units 101. This allows the actual amount of positional misalignment in each sealing unit 101 to be detected more accurately. The amount of positional misalignment is detected by calculating the average conveying pitch at the position of the detection device 103 from the results of detecting the mark 102 a predetermined number of times, for example, about 4 to 30 shots, and when an amount of positional misalignment that exceeds the allowable range is detected, the motor M is operated to adjust the position of the sealing unit 101.

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

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.

The detection device 103 is not particularly limited, but 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 also visually confirm the mark 102. A mark 102 that is detected using invisible light such as ultraviolet light may also be used.

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 together, and a detection device 103 may be provided for each group. By providing the first sealing device 100 with multiple detection devices 103, it becomes possible to adjust positional deviations with higher accuracy than when one detection device 103 is used for all sealing units 101.

When the sealing units 101 included in the first sealing device 100 are grouped with respect to the placement of the motor M or the detection device 103, the number of sealing units 101 included in each group may be, for example, about 2 to 3. The grouping regarding the placement of the motor M and the grouping regarding the placement of the detection device 103 may be the same or different. A motor M may be placed for each sealing unit 101, and a detection device 103 may be placed for each group including multiple sealing units 101. A motor M may be placed for each group including multiple sealing units 101, and a detection device 103 may be placed for each sealing unit 101.

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

The control device 104 may be provided exclusively for the first sealing device 100, or may be shared with a control device related to the 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 the 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 two or more first sealing devices 100.

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 dedicated to 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 control multiple machines in a facility such as a factory. The communication path may use, for example, a local or wide area communication network using a wireless LAN, communication cable, etc. 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.

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 torso sealing device 34. The first sealing device 100 may be employed for the temporary fastening 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.

When a misalignment occurs in the conveying pitch, the misalignment accumulates in the longitudinal direction, and the further away from the film supply sections 21, 22 the positional misalignment is likely to become more pronounced. From this perspective, it is preferable that the sealing device located downstream of the conveyance of the film F is the first sealing device 100. In the case of the arrangement shown in FIG. 1, it is preferable that the body sealing device 34 located most downstream is the first sealing device 100. In addition, it is preferable that the bottom sealing device 33 located next downstream is the first sealing device 100. The temporary fixing sealing device 31 or the mounting sealing device 32 located further upstream may not be the first sealing device 100, but may be a simpler device.

When the packaging bag 10 is surrounded by a sealed portion, it is preferable that the bag making machine 20 is equipped with 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 width direction that intersects with the longitudinal direction. By separately forming the longitudinal seal portion and the widthwise seal portion, it becomes easier to design the molds such as the seal bar and seal roll used to form each seal portion, and it is also easier to tolerate positional errors at the intersection points. From this perspective, it is preferable that at least one of the longitudinal seal device and the widthwise seal device is the first seal device 100. In the bag making machine 20 shown in FIG. 1, when manufacturing the packaging bag 10 shown in FIG. 2(a) and FIG. 2(b), the body seal device 34 is the widthwise seal device, and the bottom seal device 33 is the longitudinal seal device.

According to the embodiment of the bag making machine 20 and the manufacturing method for the packaging bag 10, in the first sealing device 100 equipped with multiple sealing units 101 for processing the same seal portion, the positional misalignment 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 savings.

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

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. It is preferably a laminate having a sealant on at least one side, such as 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.

Film F may have, as necessary, an ethylene-vinyl alcohol copolymer, a vapor-deposited layer of a metal or 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 joined together by welding using a sealant. The materials and thicknesses of the films may be the same or different from each other.

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 layer of thermoplastic resin at least on the surface. Thermoplastic resins include, but are not limited to, 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.

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 back 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.

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...tubular 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...conveying device, 31...temporary sealing device, 3 1a...preheating device, 31b...molding 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 (5)

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 that seal 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 sides of the width direction of the body film ,
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. The bag making machine according to claim 1, further comprising a control device that controls the position using the motor based on a signal obtained by the detection device detecting the mark. The bag making machine according to claim 1 or 2, characterized in that in the first sealing device, the motor and the detection device are arranged in each of the multiple sealing units. 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 located downstream of the film conveyance is the first sealing device. 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 sides of the width direction of the body film ,
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.

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