Bag making machine and bag making method

Abstract

To provide a machine and method for bag making capable of easily carrying out a correct inspection even if a packaging bag is attached with a three-dimensional manufactured body, such as a spout or a straw.SOLUTION: A machine for bag making comprises transport means 23 that carries strip-shaped films 11, 12 in a longitudinal direction, seal means 26 that seals the films 11, 12 and forms bag bodies 10 consecutively in the longitudinal direction, cut means 28 that cuts the films 11, 12 in a width direction intersecting with the longitudinal direction and separates the bag bodies 10 from the film 11, 12 continuing in the longitudinal direction, a suction conveyor 32 that sucks and carries the bag body 10 separated from the films 11, 12, and bag-body inspecting means 30 that optically inspects the bag body 10 carried by the suction conveyor 32.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Patent Document 1 describes a processing device equipped with a conveying means for bags discharged from a bag making machine, a means for inspecting the conveyed bags, a means for separating good products from defective products, a means for stacking the good products, and a means for discharging the stacked bags. The conveying means in Patent Document 1 includes an endless intermediate joint (belt) that presses the center of the bag, followed by another endless intermediate joint (belt) that presses both sides of the bag, and the bag with its deformation corrected is positioned so that it faces the camera.

[0003] Patent Document 2 describes an outer ring inspection method in which the outer shape of a flexible packaging bag is captured by a CCD camera, processed as image data to outline only the outer shape, and compared with the outlined data of the outer shape of a standard flexible packaging bag to determine the quality of the product. According to Patent Document 2, partial comparison of corner cuts, notches, etc. is possible by using the data in which only the outer shape is outlined. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-211559 A [Patent Document 2] JP 2004-323068 A Summary of the Invention [Problem to be solved by the invention]

[0005] When a three-dimensional molded body such as a spout or straw is attached as the spout of the packaging bag, the packaging bag is unlikely to be flat, and accurate inspection is difficult during image inspection. In the invention described in Patent Document 1, the bag is pressed with an endless belt to correct deformation, but it may be difficult to align the endless belt depending on the positional relationship of the three-dimensional molded body on the bag. In addition, there is a risk of insufficient inspection because the position hidden by the endless belt is not photographed by the camera. In addition, Patent Document 2 exemplifies a soft packaging bag formed by overlapping two plastic films and sealing the edges to form a bag as an inspection object, but does not mention or suggest a packaging bag with a three-dimensional molded body attached.

[0006] 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 can easily perform accurate inspection even when three-dimensional objects such as spouts and straws are attached to the packaging bags. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, a first aspect of the present invention provides a bag making machine comprising: a conveying means for conveying a band-shaped film in a longitudinal direction; a sealing means for sealing the film to form a bag body that is continuous in the longitudinal direction; a cutting means for cutting the film in a width direction intersecting the longitudinal direction to separate the bag body from the film that is continuous in the longitudinal direction; a suction conveyor for suctioning and conveying the bag body separated from the film; and a bag inspection means for optically inspecting the bag body conveyed by the suction conveyor.

[0008] In addition, a second aspect of the present invention provides a bag making machine of the first aspect, characterized in that it comprises an attachment means for attaching a molded body to the film, and an attachment portion inspection means for optically inspecting the attachment portion where the molded body is attached to the film and sealed.

[0009] In addition, a third aspect of the present invention provides a bag making machine of the second aspect, characterized in that the mounting part inspection means has a mounting part imaging means for imaging the mounting part and a light irradiation means for irradiating light onto the mounting part, the light irradiation means has a light guide plate arranged between the mounting part imaging means and the mounting part in a direction perpendicular to the film, and a light source arranged on an end surface of the light guide plate, and light emitted from the light source is irradiated towards the mounting part by diffusion or reflection in the light guide plate.

[0010] In addition, a fourth aspect of the present invention provides a bag making machine comprising a conveying means for conveying a band-shaped film in a longitudinal direction, a sealing means for sealing the film to form a bag body continuously in the longitudinal direction, an attachment means for attaching a molded body to the film, and an attachment portion inspection means for optically inspecting the attachment portion where the molded body is attached to the film and sealed, wherein the attachment portion inspection means has an attachment portion imaging means for imaging the attachment portion and a light irradiation means for irradiating light to the attachment portion, the light irradiation means having a light guide plate arranged between the attachment portion imaging means and the attachment portion in a direction perpendicular to the film, and a light source arranged on an end surface of the light guide plate, and the light emitted from the light source is irradiated towards the attachment portion by diffusion or reflection in the light guide plate.

[0011] In addition, a fifth aspect of the present invention provides a bag making method comprising: a sealing step of sealing a band-shaped film while transporting the film in the longitudinal direction to form a bag body that is continuous in the longitudinal direction; a cutting step of cutting the film in a width direction intersecting the longitudinal direction to separate the bag body from the film that is continuous in the longitudinal direction; and a bag body inspection step of optically inspecting the bag body separated from the film while suctioning the bag body and transporting it by a suction conveyor.

[0012] In addition, a sixth aspect of the present invention provides the bag making method of the fifth aspect, characterized in that it includes an attachment step of attaching a molded body to the film, and an attachment portion inspection step of optically inspecting the attachment portion where the molded body is attached to the film and sealed. Effect of the Invention

[0013] According to the present invention, even if a three-dimensional object such as a spout or straw is attached to a packaging bag, accurate inspection can be easily performed. [Brief description of the drawings]

[0014] [Figure 1] 1 is a schematic diagram illustrating a bag making machine according to an embodiment; [Diagram 2] 1A and 1B are a front view and a longitudinal sectional view showing an example of a bag body. [Diagram 3] FIG. 4 is a cross-sectional view showing an example of a mounting portion inspection means. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The present invention will be described below based on preferred embodiments with reference to the drawings. Fig. 1 is a schematic diagram showing a bag making machine of the embodiment. The bag making machine 20 of the embodiment includes a body supply section 21 around which a raw film 11a that will become the body film 11 of the bag body 10 is wound, a bottom supply section 22 around which a film that will become the bottom film 12 of the bag body 10 is wound, and a conveying means 23 that conveys the films 11, 12 in the longitudinal direction. In Fig. 1, the upstream side of the conveyance is the right side of Fig. 1, and the downstream side of the conveyance is the left side of Fig. 1.

[0016] The body film 11 and the bottom film 12 are strip-shaped films. The films 11a, 12 arranged in the body supply section 21 or the bottom supply section 22 are wound so that the longitudinal direction of the film is the circumferential direction of the roll and the width direction of the film is the axial direction of the roll. The width direction of the films 11, 12 is a direction intersecting the longitudinal direction of the films 11, 12. Although not particularly shown, if the bottom film 12 is omitted and the bag body 10 is formed from the body film 11, it is also possible to omit the bottom supply section 22.

[0017] Furthermore, the bag making machine 20 of the embodiment is equipped with an attachment means 25 that attaches a molded body to the body film 11 along the conveying line of the films 11, 12, a sealing means 26 that seals the films 11, 12 to form the bag body 10 continuously in the longitudinal direction, and cutting means 27, 28 that cut the films 11, 12 into the shape of the bag body 10. When a molded body is not attached to the film, the attachment means 25 can be omitted. The bag making machine 20 of the illustrated example is equipped with a first cutting means 27 and a second cutting means 28 as the cutting means 27, 28.

[0018] The first cutting means 27 is a cutting means for cutting between the rows to separate each row in the width direction when the bags 10 are formed in a plurality of rows in the width direction of the films 11, 12. When the bags 10 are formed in a single row on the films 11, 12, or when the bags 10 are manufactured while remaining connected in a plurality of rows in the width direction of the films 11, 12, the first cutting means 27 can be omitted. The first cutting means 27 is not particularly limited, and for example, a blade such as a Thompson blade can be used.

[0019] The second cutting means 28 is a cutting means for cutting the films 11, 12 in the width direction to separate the bag body 10 from the films 11, 12 which are continuous in the longitudinal direction. The second cutting means 28 is not particularly limited, but for example, a guillotine cutter can be used. The cutting position of the films 11, 12 by the second cutting means 28 may be in a direction transverse to the films 11, 12, and may be on a line perpendicular to the longitudinal direction, but is not particularly limited. The shape of the cut may be linear or curved, such as curved or bent. Trimming may be performed on at least a part of the periphery of the bag body 10 after separation from the films 11, 12.

[0020] Figure 2 shows an example of a bag 10 obtained by cutting with cutting means 27, 28. Figure 2(a) is a front view of the bag, and Figure 2(b) is a cross-sectional view of the bag. Line S in Figure 2(a) indicates the position of the cross section shown in Figure 2(b). This bag 10 is a standing pouch having a bottom film 12 folded in two and placed between a pair of body films 11, 11, and having self-supporting properties.

[0021] The films 11, 12 of the bag body 10 are welded at an opening 13 formed without sealing on the side where the molded body 16 is attached, body seal portions 14 on both the left and right sides of the bag body, and a bottom seal portion 15 on the side opposite the molded body 16. The opening 13 may be sealed and closed after the bag body 10 is filled with the contents. When the opening 13 is used as a filling port, the molded body 16 may be left closed. Instead of forming the opening 13 at the top of the bag body 10, the position of the opening 13 may be sealed and closed on the bag making machine 20 to form a top seal portion (not shown).

[0022] As shown in Fig. 1, the bag making machine 20 of the embodiment has a bag body inspection means 30 that optically inspects the bag body 10. The bag body inspection means 30 is an inspection device for the bag body 10. The bag body inspection means 30 can inspect the shape of the bag body 10 cut by the cutting means 27, 28 and the shapes of the sealed portions such as the body seal portion 14 and the bottom seal portion 15 formed by heat sealing. The bag body inspection means 30 includes a bag body imaging means 31 that photographs the appearance of the bag body 10, and a suction conveyor 32 that adsorbs and transports the bag body 10 separated from the films 11, 12.

[0023] The bag imaging means 31 is disposed at a position where it can image the bag 10 being transported by the suction conveyor 32. The bag imaging means 31 is not particularly limited, and a digital camera such as a CCD (charge-coupled device) camera or a CMOS (complementary metal-oxide semiconductor) camera can be used. Although not particularly shown, the bag inspection means 30 may include a light source for illuminating the bag 10.

[0024] When the bag body 10 is cut from the continuous films 11, 12, the bag body 10 is arranged on approximately the same plane as the films 11, 12. However, after the bag body 10 is separated by cutting, the orientation of the bag body 10 may change, or the shape of the bag body 10 may be distorted due to curling of the films 11, 12, etc. The suction conveyor 32 suctions the bag body 10, so that the shape of the bag body 10 can be corrected to a flat shape. The bag body 10 being conveyed by the suction conveyor 32 is photographed by the bag body imaging means 31, so that the flat shape of the bag body 10 can be recognized more accurately. This makes it easy to accurately inspect the bag body 10 even if the molded body 16 is attached to the bag body 10. Since the suction conveyor 32 suctions the bag body 10, suction holes for sucking air may be provided at appropriate intervals in a conveying member such as a conveyor belt.

[0025] The objects to be inspected by the bag inspection means 30 are not particularly limited, but can inspect, for example, the height dimension of the bag 10, the width dimension of the bag 10, the width of the body seal portion 14, the shape of the bottom seal portion 15, the angle between the body seal portion 14 and the bottom seal portion 15, the roundness of the corner portions 14a, 15a, the formed body 16 and the attachment portion 19, etc. The number of inspection points is not particularly limited, and may be one or two or more.

[0026] If there is an abnormality in the shape of the bag 10, it can be automatically discovered by analyzing the image of the bag 10 taken by the bag imaging means 31. The bag inspection means 30 may have a discrimination unit that discriminates the quality of the bag 10 using a program, a computing device, etc. It may also have an exclusion device that excludes defective bags 10 from the suction conveyor 32.

[0027] The method of analyzing the image of the bag body 10 is not particularly limited, but may be a method of recognizing the positions of each part, such as the body seal part 14, the bottom seal part 15, and the corner parts 14a, 15a, from the image of the bag body 10, deriving the shape, dimensions, etc. of each part, and comparing them with specified values. The image of the bag body 10 may be compared with a reference image that represents the range of allowable shapes to infer whether the shape, dimensions, etc. of each part are within the allowable range. Furthermore, if the bag body 10 has a pattern such as letters or a design, it is also possible to inspect the position, shape, dimensions, color tone, etc. of the pattern.

[0028] In image analysis, the image obtained is input as pixel data having gradations such as full color and gray. In image processing, removal of background data, removal of noise, correction of orientation by in-plane rotation, omission of color information unnecessary for processing, extraction of contours, etc. Images of good and bad products may be prepared in advance, and setting parameters may be adjusted using artificial intelligence (AI), etc.

[0029] The molded body 16 of the bag body 10 shown in Figures 2(a) and 2(b) has a flange portion 17 joined to the body film 11 at an attachment portion 19, and a tubular portion 18 protruding from the flange portion 17 to the outside of the peripheral portion 19a of the bag body 10. The molded body 16 is a three-dimensional molded body such as a spout or a straw. If the tubular portion 18 is joined to the body film 11 at the attachment portion 19, the flange portion 17 may be omitted. The presence of the flange portion 17 is preferable because it makes it easier to stretch the body film 11 and ensures a seal with the body film 11 at the flange portion 17. The tubular portion 18 may be simply tubular, or may have a lid or various attachments attached, or may be an irregularly shaped hollow body.

[0030] 1, 2 and 3, the bag making machine 20 of the embodiment includes an attachment part inspection means 40. The attachment part inspection means 40 is an inspection device that optically inspects the attachment part 19 where the molded article 16 is attached to the body film 11 and sealed. The attachment part inspection means 40 has an attachment part imaging means 41 that images the attachment part 19. The attachment part imaging means 41 is not particularly limited, but a digital camera such as a CCD (charge-coupled device) camera or a CMOS (complementary metal-oxide semiconductor) camera can be used.

[0031] 1, by disposing the mounting portion imaging means 41 on both the top and bottom surfaces of the films 11 and 12, the mounting portion 19 can be inspected from both sides of the films 11 and 12. The mounting portion imaging means 41 may image a part of the area of ​​the bag body 10 including the mounting portion 19 or the entire area.

[0032] The attachment portion inspection means 40 in the illustrated example is disposed between the positions of the attachment means 25 and the sealing means 26 in the longitudinal direction in which the body film 11 is transported in the bag making machine 20. The attachment device for the molded body 16 may be composed of the attachment means 25 and the attachment portion inspection means 40. By inspecting the attachment portion 19 at the stage where the attachment portion 19 is formed in the body film 11 before the body seal portion 14 is formed, it becomes easier to detect defects in the attachment portion 19 and its vicinity in the body film 11. Although not specifically shown, the attachment portion inspection means 40 may be disposed at a stage after at least a portion of the seal portions 14, 15 have been formed in the films 11, 12.

[0033] 3 shows a specific example of the attachment part inspection means 40 arranged on one side of the films 11, 12 that become the bag body 10. The attachment part inspection means 40 has a light irradiation means 42 between the attachment part imaging means 41 and the attachment part 19. As described above, when the attachment part imaging means 41 is arranged on both the top and bottom surfaces of the films 11, 12, the light irradiation means 42 is also arranged on both the top and bottom surfaces of the films 11, 12.

[0034] The light irradiation means 42 is an illumination means for irradiating the mounting part 19 with light. The illustrated light irradiation means 42 has a light guide plate 43 arranged between the mounting part imaging means 41 and the mounting part 19 in a direction perpendicular to the films 11 and 12, and a light source 44 arranged on an end surface of the light guide plate 43. A frame body 45 is arranged on the outside of the light source 44. The frame body 45 preferably has a light-shielding property. This type of light irradiation means 42 is known as, for example, a flat dome illuminator. When the frame body 45 is a polygon such as a rectangle, it is preferable to arrange the light source 44 on each side of the light guide plate 43.

[0035] The light source 44 is not particularly limited, but a light emitting diode (LED) is preferable because it has a stable light output, low power consumption, and low heat generation. The light 46 output from the light source 44 may be one type of monochromatic light, may be a mixed color of two or more monochromatic lights, or may be emission of a continuous spectrum. The color of the emitted light is not particularly limited, and may be white, a color such as red or blue, or invisible light such as ultraviolet light or infrared light.

[0036] Light 46 output from the light source 44 is diffused or reflected by the light guide plate 43 and irradiated towards the mounting part 19. Although not particularly shown, structures such as minute irregularities that diffuse or reflect the light 46 are appropriately arranged on the light guide plate 43, and it is possible to adjust the intensity distribution, etc. of the light 47 irradiated from the light guide plate 43 towards the mounting part 19. The intensity distribution of the light 47 may be uniform within the surface of the light guide plate 43, or the light intensity may vary from near the center towards the outer periphery.

[0037] Light 47 emitted from light guide plate 43 is irradiated toward mounting part 19 in a substantially perpendicular direction, so that light 48 incident substantially perpendicularly is predominant between mounting part imaging means 41 and mounting part 19. As a result, the amount of light reflected obliquely toward mounting part imaging means 41 from places other than mounting part 19 and the effects of diffuse reflection are reduced, and the effects of reflected light on image data of mounting part 19 can be suppressed. This makes it possible to easily and accurately inspect mounting part 19 even if molded body 16 is attached to bag body 10.

[0038] The objects to be inspected by the mounting part inspection means 40 are not particularly limited, but include the position of the molded body 16, the shape of the mounting part 19, the shape of the peripheral part 19a of the mounting part 19, and the shape of the flow path part 19b of the bag body 10 inside the mounting part 19. The number of inspection points is not particularly limited, and may be one or more. When the molded body 16, the mounting part 19 or its vicinity have a pattern such as a letter or a design, it is also possible to inspect the position, shape, dimensions, color tone, etc. of the pattern using the mounting part inspection means 40.

[0039] The method of analyzing the image of the mounting part 19 captured by the mounting part imaging means 41 is not particularly limited, but may be a method in which the positions of each part, such as the molded body 16, the mounting part 19, the peripheral part 19a of the mounting part 19, the flow path part 19b, etc., are recognized from the image of the mounting part 19, and the shape, dimensions, etc. of each part are derived and compared with specified values. The image of the mounting part 19 may be compared with a reference image that represents the range of allowable shapes to infer whether the shape, dimensions, etc. of each part are within the allowable range. Defects such as tears and curling of the body film 11 near the molded body 16 may also be detected.

[0040] The mounting part inspection means 40 may have a discrimination unit that discriminates whether the mounting part 19 is good or bad using a program, a computing device, or the like. In order to eliminate defective products, the position where a defect is found in the mounting part 19 may be recorded, and the defective product may be eliminated after the bag body 10 is cut. Information regarding the defect in the mounting part 19 may be transmitted to the bag body inspection means 30. The bag body inspection means 30 may recognize the defect in the mounting part 19 received from the mounting part inspection means 40 as a defect in the bag body 10, regardless of the inspection result using the bag body imaging means 31. In this way, defective mounting parts 19 can be eliminated in the same manner as defective bags 10.

[0041] The method of manufacturing the bag 10 using the bag making machine 20 generally includes the following steps. (1) A mounting step of mounting the molded body 16 on the body film 11. (2) An attachment part inspection step of optically inspecting the attachment part 19 where the molded body 16 is attached and sealed to the body film 11. (3) A sealing step of sealing the films 11 and 12 to form the bag body 10 continuously in the longitudinal direction. (4) A cutting step of cutting the films 11, 12 in the width direction to separate the bag body 10 from the films 11, 12 which are continuous in the longitudinal direction. (5) A bag inspection process in which the bags 10 separated from the continuous films 11, 12 are optically inspected.

[0042] To use the inspection method for the mounting part 19, it is preferable to perform at least the (1) mounting step, (2) mounting part inspection step, and (3) sealing step. It is also possible to perform the (4) cutting step without performing the (5) bag body inspection step.

[0043] To use the method for inspecting the bag body 10 after cutting, it is preferable to carry out at least the (3) sealing step, the (4) cutting step, and the (5) bag body inspection step. It is also possible to carry out the (1) mounting step without carrying out the (2) mounting part inspection step.

[0044] The operation of the bag making machine 20 illustrated in Fig. 1 can be generally described as follows. First, the raw film 11a wound around the body supply section 21 is cut by a cutter (not shown) along its longitudinal direction into two belt-shaped body films 11 of the same width. A joining means 23a such as a joining roll is used to accurately align the two body films 11 in the front-to-back and left-to-right positions. The joining means 23a can be moved by a moving means such as a servo motor in the up-and-down direction, which is the overlapping direction of the body films 11, and in the width direction of the body films 11.

[0045] After the bottom film 12 is inserted between the two body films 11, the body film 11 and the bottom film 12 are transported in a superimposed state along the longitudinal direction of the films 11, 12 by the transport means 23. The films 11, 12 are an example of a compound film formed by folding a strip-shaped film or by stacking a plurality of films. In order to achieve good sealing, the transport means 23 is preferably configured to transport the films 11, 12 intermittently at a constant cycle using a controller (not shown), and to pause transport when sealing the film and / or the molded body.

[0046] When intermittent transport is performed by transport rollers or the like, the transport rollers may be stopped when transport of films 11, 12 is paused. Transport means 23 is not limited to transport rollers or the like capable of continuously transporting films 11, 12, and may be configured to intermittently grip and transport films 11, 12. For example, a pair of clamping bars each having a plurality of clamping members such as rubber arranged in the width direction of films 11, 12 may be arranged above and below, and the clamping bars clamping films 11, 12 may be moved downstream. The feed amount of films 11, 12 can be controlled by control based on an optical sensor or control of the rotation amount of a servo motor.

[0047] The mounting means 25 includes preheating means 25a for preheating the area on the body film 11 where the molded article 16 is to be mounted, shaping means 25b for forming the area on the body film 11 where the molded article 16 is to be mounted into a concave shape, insertion means 25c for inserting the molded article 16 between the body films 11, 11, temporary fastening means 25d for temporarily fastening the molded article 16 to the body film 11, and fastening means 25e for fastening the molded article 16 to the body film 11 after temporary fastening. The mounting means 25 preferably includes at least the insertion means 25c and fastening means 25e.

[0048] The preheating means 25a is a heater that heats at least a part of the region of the body film 11 where the molded body 16 is to be attached. The region preheated by the preheating means 25a (preheating region) can be provided, for example, in the portion where the flange portion 17 of the molded body 16 is to be attached. The preheating region may include the outside (periphery) of the region where the molded body 16 is to be attached. The preheating process makes the preheating region more likely to stretch.

[0049] The forming means 25b is a forming section that forms at least a part of the region of the body film 11 where the formed body 16 is attached by compressed air, vacuum, or the like. The region formed by the forming means 25b (forming region) can be provided, for example, in the portion where the flange portion 17 of the formed body 16 is attached. Furthermore, the body film 11 can also be formed in the flow path portion 19b of the bag body 10, which is located inside the attachment portion 19. The forming region may include the outside (peripheral portion) of the region where the formed body 16 is attached. It is preferable to set the forming region above the preheating region, as this makes forming easier.

[0050] The insertion means 25c is a belt conveyor, a parts feeder, or the like that is intermittently driven in a direction intersecting the flow direction of the body film 11. The molded body 16 is supplied between the body films 11 from the insertion means 25c. If a preheating region or molding region is formed in the body film 11, the molded body 16 is inserted downstream of that region in the conveying direction. When the molded body 16 is inserted between the body films 11 and the body film 11 is conveyed by the conveying means 23, the preheating region may be stretched along the outer circumferential surface of the molded body 16 by the pulling force of the conveying means 23. If a molding region is formed in the body film 11, it is not necessary to set the preheating region to be stretched.

[0051] The temporary fixing means 25d temporarily fixes the molded body 16 to the body film 11. It is preferable to perform the temporary fixing step immediately after the insertion step, as long as the time during which the transport of the films 11 and 12 is stopped is not unnecessarily extended. This reduces the risk of the molded body 16 being displaced due to the transport of the films 11 and 12. The temporary fixing means 25d is, for example, a point seal device that partially seals the gap between the body film 11 and the peripheral surface of the molded body 16.

[0052] The fixing means 25e is provided downstream of the temporary fixing means 25d in the conveying direction. The fixing means 25e is preferably provided at two or more locations along the conveying direction of the films 11, 12. When the entire periphery of the molded body 16 is heated during temporary fixing of the molded body 16, or when the molded body is small or made of a material that is easy to seal, the fixing of the molded body 16 to the body film 11 can be completed with one seal. In this case, it is sufficient to provide the fixing means 25e at one location in the conveying direction.

[0053] Furthermore, the mounting means 25 may have a slit forming means 24 for making a slit (not shown) in the body film 11 before the shaped body 16 is mounted. By mounting the shaped body 16 through the slit, it becomes easier to insert the shaped body 16 into the body film 11. If the slit forming means 24 is omitted, the shaped body 16 may be inserted from an edge of the body film 11 in the width direction.

[0054] When forming a slit by slit forming means 24 at the position where molded body 16 is to be attached, the slit may be formed at a position that does not reach the widthwise edge of body film 11. For example, a slit may be formed in body film 11 before molded body 16 is inserted at a position corresponding to peripheral edge 19a of attachment portion 19. There are no particular limitations on slit forming means 24, and examples include a blade such as a punching blade.

[0055] The sealing step of sealing the films 11, 12 is preferably performed in parallel with or after the mounting step of the formed body 16. The sealing step may be set separately into a body sealing step of forming a body seal portion 14 between the two body films 11, and a bottom sealing step of forming a bottom seal portion 15 at the position where the bottom film 12 overlaps the body film 11. The sealing means 26 in the illustrated example includes bottom sealing means 26a and body sealing means 26b.

[0056] The films 11 and 12 constituting the bag body 10 are not particularly limited, but are preferably resin films or laminate films having a sealant on at least one side. When the films 11 and 12 have a sealant on one side, the films 11 and 12 can be sealed by facing the sealant surfaces of the body film 11 or the sealant surfaces of the films 11 and 12 to each other and welding them together.

[0057] The resin used for the films 11 and 12 is not particularly limited, and may be one or more of polyolefin resins such as polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate copolymer (EVA), and cyclic polyolefin, polyamides such as nylon, and polyesters such as polyethylene terephthalate. The origin of the resin is not particularly limited, and may be, for example, not only petroleum-derived plastics but also plant-derived plastics, biomass-derived bioplastics, and the like.

[0058] The films 11 and 12 may have an ethylene-vinyl alcohol copolymer, a vapor-deposited layer of a metal or an inorganic compound, or a metal foil such as aluminum foil, if necessary. The body film 11 and the bottom film 12 may be the same or different in material and thickness, as long as they can be joined to each other by welding or the like. The films 11 and 12 may be made of a mono-material material such as polyethylene or polyolefin.

[0059] It is preferable that molded body 16 has at least a layer of a thermoplastic resin on the surface thereof that can be welded to the sealant layer of body film 11, so that molded body 16 can be heat sealed to body film 11. Materials that can be used to form molded body 16 include thermoplastic plastics such as 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.

[0060] The bag body 10 is not limited to the standing pouch shown in Fig. 2, but can also be applied to various types of packaging bags that can be made by side-taken bags, such as flat bags sealed on three or four sides, and square-bottom bags. If the bottom film 12 is omitted in the bag making machine 20 shown in the figure, it is also possible to implement, for example, a method of sealing two body films 11 to make a bag, or a method of folding one body film 11 in half along the longitudinal direction and using the central fold line as the bottom of the bag body 10.

[0061] Although the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention. Modifications include addition, substitution, omission, and other changes to components in the embodiment. [Explanation of symbols]

[0062] 10...bag body, 11...body film, 11a...raw film, 12...bottom film, 13...opening, 14...body seal portion, 14a...corner portion of body seal portion, 15...bottom seal portion, 15a...corner portion of bottom seal portion, 16...molded body, 17...flange portion, 18...tubular portion, 19...mounting portion, 19a...periphery, 19b...flow path portion, 20...bag making machine, 21...body supply portion, 22...bottom supply portion, 23...conveying means, 23a...matching means, 24...slit forming means, 25 ...mounting means, 25a...preheating means, 25b...molding means, 25c...insertion means, 25d...temporary fastening means, 25e...fixing means, 26...sealing means, 26a...bottom sealing means, 26b...body sealing means, 27...first cutting means, 28...second cutting means, 30...bag body inspection means, 31...bag body imaging means, 32...suction conveyor, 40...mounting portion inspection means, 41...mounting portion imaging means, 42...light irradiation means, 43...light guide plate, 44...light source, 45...frame, 46, 47, 48...light.

Claims

1. A conveying means for conveying a belt-shaped film in a longitudinal direction; a sealing means for sealing the film to form a bag continuously in the longitudinal direction; cutting means for cutting the film in a width direction intersecting the longitudinal direction to separate the bag body from the film which is continuous in the longitudinal direction; a suction conveyor that suctions and conveys the bag body separated from the film; a bag inspection means for optically inspecting the bag transported by the suction conveyor; A mounting means for inserting and mounting a molded body between the films; and an attachment portion inspection means for optically inspecting an attachment portion where the molded body is attached to the film and sealed, the mounting portion inspection means has a mounting portion imaging means for imaging the mounting portion and a light irradiating means for irradiating light to the mounting portion, the mounting portion imaging means being disposed on both upper and lower surfaces of the film, and the light irradiating means also being disposed on both upper and lower surfaces of the film, thereby inspecting the mounting portion from both sides of the film; A bag making machine characterized in that the light irradiation means has a light guide plate arranged between the mounting part imaging means and the mounting part in a direction perpendicular to the film, and a light source arranged on an end surface of the light guide plate, and the light emitted from the light source is irradiated toward the mounting part by diffusion or reflection in the light guide plate.

2. a sealing step of sealing the belt-shaped film while transporting the film in a longitudinal direction to form a bag body continuously in the longitudinal direction; a cutting step of cutting the film in a width direction intersecting the longitudinal direction to separate the bag body from the film that is continuous in the longitudinal direction; a bag inspection process of optically inspecting the bag separated from the film while suctioning the bag and conveying it by a suction conveyor; A mounting step of inserting a molded body between the films and mounting it; and an attachment part inspection step of optically inspecting an attachment part where the molded body is attached to the film and sealed, the mounting portion inspection step uses a mounting portion imaging means for imaging the mounting portion and a light irradiating means for irradiating light to the mounting portion, and the mounting portion imaging means is disposed on both upper and lower surfaces of the film, and the light irradiating means is also disposed on both upper and lower surfaces of the film, thereby inspecting the mounting portion from both sides of the film; The bag making method is characterized in that the light irradiation means has a light guide plate arranged between the mounting part imaging means and the mounting part in a direction perpendicular to the film, and a light source arranged on an end surface of the light guide plate, and the light emitted from the light source is irradiated toward the mounting part by diffusion or reflection in the light guide plate.

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