JP2019002774A - Pillow packaging machine and method for inspecting center seal portion formed by pillow packaging machine - Google Patents

Abstract

To provide means for seal quality judgment of a center seal part with high accuracy by using X-rays.SOLUTION: An embodiment of this invention includes a bag forming apparatus 15 for forming a continuously supplied belt-shaped film 5 in a cylindrical shape; a package conveying apparatus 4 disposed on an upstream side of the bag forming apparatus and feeding and supplying the object to be packaged 3 in the bag forming apparatus; a center seal device 17 for applying center seal to both end edges 5a of a belt-shaped film formed in a cylindrical shape; a top seal apparatus 20 which is disposed on a downstream side of the center seal device and is sealed and cut in a width direction of the cylindrical film with both end edges of the center sealed at a center seal; and an X-ray apparatus 30 to inspect the site where the center seal is to be applied. The center seal apparatus includes a pair of pinch rollers 17a for sandwiching and conveying both end edges, and a center sealer (bar sealer 17b, press roller 17c) disposed on the downstream side of the pinch roller to heat and pressurize both end edges of the pinch roller.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pillow wrapping machine and a method for inspecting a center seal portion formed by the pillow wrapping machine, and more particularly to a pillow wrapping machine having a function of detecting a seal failure in a center seal portion.

  A pillow packaging machine, which is one form of a packaging machine, has the following configuration. First, a belt-like film wound around a raw film is continuously supplied to a bag making device, and a tubular film formed into a tubular shape is formed when the bag making device is passed through. In addition, an article transporting and supplying device is arranged on the upstream side of the bag making device, and an object to be packaged conveyed at predetermined intervals from the object to be packaged conveying and supplying device is supplied into the bag making device. Accordingly, when the article to be packaged passes through the bag making machine, the article to be packaged is stored at predetermined intervals in the cylindrical film, and the article to be packaged is conveyed together with the cylindrical film. A center seal device and a top seal device are arranged along the conveying direction. The center seal device seals the film polymerization end of the tubular film. The top seal device seals a predetermined position of the tubular film (the portion where the front and rear packaging objects do not exist) in the lateral direction of the traveling direction and cuts the cylindrical film in which the front packaging object is stored. A part of the film is separated from the subsequent cylindrical film to produce a package.

  If the packaged item is relatively brittle, such as biscuits or other baked confectionery, freeze dried, etc., and a part of the product is chipped and removed, the stripped piece etc. is film-polymerized on the cylindrical film before sealing. There is a risk of being sealed by the center seal device in a state of entering the end. When such a state occurs, a seal failure in which foreign matter is mixed into the center seal portion results in a defective seal, and such a poorly sealed package becomes a defective product and needs to be discarded.

  Therefore, for example, an inspection device is provided on the downstream side of the center seal device, and the presence or absence of foreign matter in the center seal portion is inspected. When a defective product mixed with foreign matter is detected, the defective product packaging device with the foreign matter mixed into the center seal portion is detected by the defective product discharge device disposed downstream of the top seal device. Eliminate from the transfer line.

  In the case of a package manufactured using a non-transparent packaging film such as an aluminum vapor deposition film or a packaging film in which a relatively dark color is also printed on the center seal portion, a packaging film is used for a general optical sensor. Therefore, it is conceivable to use an X-ray inspection apparatus (including a soft X-ray inspection apparatus) as an inspection apparatus. Although it is not a pillow packaging machine, for example, Patent Document 1 discloses that an X-ray inspection apparatus is used for inspection of a seal state.

JP2006-24132A

  However, the center seal part formed by heating and pressurizing with the center seal device is pressurized by the sealer seal pin and the pinch roller and pulled forward. It is formed or a seal ridge is formed. Since the seal flaws and the like are not so problematic when viewed with eyes, the seal flaws are in a normal sealing state as described above. As a result, it is impossible to determine whether the seal is a foreign object such as a piece of a packaged object or the like, and there is a problem in that a defective seal due to foreign object biting cannot be detected correctly.

  In order to solve the above-described problems, the pillow packaging machine of the present invention is (1) a bag making device that forms a continuous belt-like film into a cylindrical shape, and an upstream side of the bag making device. A packaged article conveying and supplying apparatus for conveying and supplying an article to be packaged in the bag making machine, a center seal apparatus for applying a center seal to both side edge portions of the strip-shaped film produced in the cylindrical shape, and its center A top seal device that is disposed downstream of a seal device and seals and cuts in the width direction of the cylindrical film whose side edges are center-sealed, wherein the center seal is The center seal device includes a pair of pinch rollers that sandwich and convey the edge portions on both sides, and the edge portions on both sides that are disposed downstream of the pinch rollers. Add · Includes a pressurizing center sealer, the X-ray inspection apparatus on the upstream side of said center sealer and to perform inspection by irradiating X-rays on the both side edges. X-rays include soft X-rays.

  In the present invention, X-rays are radiated on both side edge portions of the belt-like film that are not heated by the center sealer, and the presence or absence of foreign matter is inspected on the both side edge portions. The edge portions on both sides are heated by a center sealer after inspection and heat sealed to become a center seal portion. Therefore, when both side edge portions before sealing are inspected and foreign matter is detected, the seal is performed in a state where the foreign matter is present, so that the center seal portion has a sealing failure in which foreign matter is present. On the other hand, when no foreign matter is detected at the overlapping edge portions on both sides, sealing is performed as it is, so that a center seal portion free from foreign matter is formed. In the present invention, X-rays are irradiated and inspected on both side edge portions before heating, so that the seal fist formed by heating of the center sealer is not formed at the irradiated portion. When foreign matter is mixed in the edge portions on both sides, the foreign matter can be detected with high accuracy. As described above, the present invention is characterized in that a seal quality test is performed in a state before actual sealing.

  (2) The X-ray inspection apparatus may irradiate the X-rays on both side edge portions located between the pinch roller and the center sealer. By doing so, the edge portions on both sides irradiated with X-rays are sandwiched between the pinch rollers on the upstream side, and are a relatively narrow range between the pinch roller and the center sealer. The edges on both sides proceed while keeping the overlapping / contacting state. Therefore, it is possible to suppress as much as possible the possibility of foreign matter entering the side edges after X-ray inspection and the possibility of foreign matter existing on both side edges at the time of inspection coming off before reaching the center sealer. Thus, the presence or absence of a seal failure in the center seal portion can be determined with higher accuracy.

  (3) The X-ray inspection apparatus may irradiate the X-rays on the side edge portions located on the upstream side of the pinch roller. Since the pinch roller sandwiches both side edges firmly and gives a biasing force forward, irregularities are often formed on the side circumferential surface that contacts both side edges, and such uneven parts are formed on both side edges. As a result of the contact, irregularities may be formed on the surfaces of the edge portions on both sides. Since the edge portions on both sides with which the pinch roller contacts are not heated but only pressed, the unevenness formed on the surface is also lightly formed. For example, the sensitivity of X-rays is increased. In such a case, the unevenness may be detected, which may affect the determination of contamination. Therefore, by inspecting by irradiating X-rays on the upstream side of the pinch roller, such a problem can be eliminated and inspection can be performed with higher accuracy.

  (4) A pair of auxiliary rollers sandwiching the side edge portions on the upstream side of the pinch roller, wherein the auxiliary roller has a flat surface in contact with the side edge portions, and the X-ray The inspection apparatus may irradiate the X-rays on both side edge portions located between the auxiliary roller and the pinch roller. In this way, the front and back of the inspection area at both side edge portions on the upstream side of the pinch roller are sandwiched between the auxiliary roller and the pinch roller and are in a tensioned state, so that the inspection can be performed with higher accuracy.

  (5) The X-ray inspection apparatus may include means for preventing the object to be packaged from being irradiated. If it does in this way, the irradiated X-ray | X_line can be efficiently used for a test | inspection, and there is no influence by being irradiated with the X-ray | X_line with respect to a packaged object.

  (6) A method for inspecting a center seal portion formed by a pillow packaging machine according to the present invention is a method of forming a continuous belt-like film into a cylindrical shape with a bag making machine, An inspection method in a pillow packaging machine having a function of forming a center seal portion by sealing a center seal portion with respect to both side edge portions, wherein the X-ray inspection device is heated by the center sealer of the center seal device. It is characterized by irradiating the previous area with X-rays and inspecting contamination.

  In the present invention, since inspection is performed by irradiating both side edges of the strip-shaped film before being heated by the center sealer with X-rays, the surface of the inspection area has no seal flaws due to heating, and foreign matter is mixed in with high accuracy. It is possible to inspect for the presence or absence of such as.

It is a front view which shows suitable one Embodiment of the pillow packaging machine which concerns on this invention. It is a figure which shows the part of the X-ray inspection apparatus and center seal apparatus which become the principal part of this invention. It is a figure which shows a modification. It is a figure which shows another modification.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not construed as being limited thereto, and various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art without departing from the scope of the present invention.

  FIG. 1 shows a preferred embodiment of a pillow packaging machine according to the present invention. The pillow wrapping machine is disposed on the upstream side of the packaging machine main body 1, the film supply device 2 for continuously supplying a belt-shaped packaging film to the packaging machine main body 1, and the packaging machine main body 1. 1 is provided with a packaged article conveying and supplying device 4 for supplying the packaged article 3 at a predetermined interval. The package 3 is a brittle article such as biscuits or other baked confectionery, dry noodles such as freeze-dried noodles, etc., and is easily broken off during transportation (food). The thing 2 is not restricted to this.

  The film supply device 2 links the output of a driving motor (not shown) such as a servo motor, which is not shown, to the original roll 6 obtained by winding the belt-like film 5 into a roll. Supplying to the packaging machine body 1 at a constant speed while appropriately controlling the rotation speed. Further, various rollers 7 (only one is shown in the figure as a representative) are arranged at predetermined positions from the original fabric roll 6 to the packaging machine body 1, and the belt-like film 5 fed out from the original fabric roll 6. Is guided to the packaging machine main body 1 through a predetermined path by being passed over the roller 7. In the present invention, it is not always necessary to link the drive motor to the original fabric roll 6, and a feed roller may be provided on the transport path of the packaging film and pulled out.

  For the belt-like film 5, for example, a non-transparent film material such as an aluminum vapor-deposited film, or a film material in which a relatively dark color is printed on both side edge portions 5 a serving as a center seal portion is used.

  The package transport / supply device 4 includes a sprocket 9 disposed at the front and rear, an endless chain 10 spanned by the plurality of sprockets 9, and a plurality of push fingers 11 attached to the endless chain 10 at a predetermined pitch. It is configured with. Thereby, when the pushing finger 11 hits the rear surface of the article to be packaged 3, the article to be packaged 3 moves forward on the conveyance path as the pushing finger 11 moves.

  The packaging machine main body 1 is disposed on the downstream side of the bag making machine 15 for making the supplied belt-like film 5 into the cylindrical film 14, and the film polymerization end of the cylindrical film 14 is moved in the traveling direction. A center seal device 17 that heat-seals along the belt, a belt conveyor 16 that is disposed on the downstream side of the center seal device 17 and conveys the tubular film 14 that encloses the article 3 to be packaged, and a predetermined position above the belt conveyor 16 The upper restraint belt 18 disposed on the belt conveyor 16, the top seal device 20 disposed on the downstream side of the belt conveyor 16, and the transport conveyor device 19 disposed on the downstream side of the top seal device 20.

  The bag making device 15 allows the strip-shaped film 5 continuously supplied from the film supply device 2 to pass therethrough so that both side edge portions 5a of the strip-shaped film 5 are brought into contact with each other and polymerized to form a tubular film. Make 14 bags. In addition, the articles to be packaged 3 that are sequentially supplied from the article transporting and supplying apparatus 4 to the packaging machine main body 1 are fed into the bag making machine 15. Thereby, the to-be-packaged goods 3 supplied to the bag making machine 15 are arrange | positioned in the cylindrical film 14 for every predetermined space | interval.

  The center sealing device 17 seals both side edge portions 5a of the polymerized belt-like film 5. The center seal device 17 heat-seal by heating while sandwiching the side edge portions 5a of the belt-like film 5 from both sides. More specifically, as shown in an enlarged view in FIG. 2, the center seal device 17 includes a pair of pinch rollers 17a that sandwich and convey a portion where the side edge portions 5a are overlapped, and a superposition thereof. A pair of square bar-like bar sealers 17b that sandwich and heat-seal the heated parts from both sides, and are arranged on the downstream side of the bar sealer 17b, and heat and melt the overlapping parts of the side edges of the melted film. And a pair of press rollers 17c for completing the heat sealing. The bar sealer 17b and the press roller 17c constitute a center sealer. In the present embodiment, a center sealer composed of a bar sealer 17b having a square bar shape and a press roller 17c is used. However, a roller type center sealer arranged on the left and right sides of both side edge portions 5a may be used. The roller type performs heating and pressurization.

  The press roller 17c also has a function as a pinch roller. In other words, the press roller 17c rotates synchronously with the center seal portion 42 sandwiched with a predetermined pressure, and therefore applies a conveying force to the center seal portion 42 and thus the tubular film 14. That is, in this embodiment, it can be said that the structure which arrange | positions a pinch roller before and behind the bar sealer 17b is taken.

  The upper restraining belt 18 is disposed in the immediate vicinity of the upstream side of the top seal device 20, and suppresses the article 3 in the tubular film 14 from being lifted upward so that it can be conveyed while maintaining a horizontal state. ing.

  The top seal device 20 seals and cuts the tubular film 14 in a direction orthogonal to the traveling direction, that is, in a direction crossing the film. The top seal device 20 of the present embodiment is of a so-called box motion type, and a pair of top sealers 21 and 22 arranged vertically are kept in a state where the seal surfaces 21a and 22a are opposed to each other. A drive mechanism is provided for revolving around the trajectory. Both the top sealers 21 and 22 operated by this drive mechanism move toward each other from a reference position separated by a predetermined distance, and sandwich the tubular film 14 from above and below, so that the film portions that are in contact with the sealing surfaces 21a and 22a are located. Pressurize at a predetermined pressure and heat. Both the top sealers 21 and 22 move forward along the moving direction of the tubular film 14 while maintaining the state in which the tubular films 14 are held close to each other as described above. The moving speed at this time is equal to the moving speed of the tubular film 14. Both the top sealers 21 and 22 move away from each other when moved by a predetermined distance, and move in the direction opposite to the moving direction of the tubular film 14 to reach the reference position.

  As described above, the top seal device 20 of the present embodiment has a function of moving both the top sealers 21 and 22 up and down and a function of moving back and forth along the traveling direction of the tubular film 14. The drive mechanism for carrying out such a function may be one that transmits the power of one drive source to both the top sealers 21 and 22 via a power transmission mechanism such as a cam or a link, or moves up and down. It is also possible to separately provide a drive source for driving and a drive source for moving forward and backward.

  The film portion to be sealed and cut by the top sealers 21 and 22 is a predetermined position between the front and back packages 3. Thereby, the top part of the cylindrical film 14 is isolate | separated from the subsequent by passing the top seal apparatus 20, and the package body 23 is manufactured.

  Here, in the present embodiment, the X-ray inspection apparatus 30 is disposed at a predetermined position upstream of the bar sealer 17b of the center seal apparatus 17. The X-ray inspection apparatus 30 of this embodiment irradiates soft X-rays on both side edge portions 5a of the overlapping strip-like film 5 before center sealing, which is an inspection target region, and transmits soft X-rays transmitted through the inspection target region. It detects the strength and detects the contamination of foreign matter such as a piece of the package 3.

  That is, both side edge portions 5a of the belt-like film 5 formed into a cylindrical shape by the bag making machine 15 protrude outward and downward from the bottom surface of the bag making machine 15, and contact and overlap each other in a suspended state. In this state, both side edge portions 5a receive a forward conveying force while being sandwiched between the pair of pinch rollers 17a from the left and right, move forward as they are, are heated by the bar sealer 17b, and melt and soften. The side edge portions 5a are sealed by being pressurized and cooled by the downstream press roller 17c while being heated by the center sealer 17b, so that the center seal portion 24 is formed. The center seal portion 24 is then tilted and displaced along the bottom surface of the tubular film 14 and is conveyed in that state.

  The to-be-packaged item 3 of this embodiment is fragile, and a part thereof may fall as a piece, and the piece is sandwiched between the overlapping side edge portions 5a depending on the dropping position. When passing through the pinch roller 17a and the bar sealer 17b and passing through the press roller 17c in this pinched state, the pinched piece is sealed as it is and exists in the center seal portion 24, resulting in a poor seal. In particular, after the pinch roller 17a, the pinch roller 17a and the press roller 17c sandwich the left and right side edge portions 5a, respectively, and the both side edge portions 5a pass between both in a relatively tight state. Therefore, the piece sandwiched between the side edge portions 5a passes through the bar sealer 17b as it is without dropping or leaving below the side edge portions 5a, that is, outside, and reaches the press roller 17c. Therefore, as described above, the pieces sandwiched between the side edge portions 5a are present in the center seal portion 24 as they are. In addition, various foreign substances may enter between the side edge portions 5a in addition to the pieces of the package 3 described above.

  As described above, the X-ray inspection apparatus 30 sets the side edge portions 5a before being heated by the bar sealer 17b as the inspection target region. The X-ray inspection apparatus 30 includes an X-ray irradiation apparatus 31 disposed on the left and right sides in the direction orthogonal to the transport direction, below the lower surface of the bag making machine 15 and the transport surface of the package 3, and a line sensor 32 and a determination processing unit (not shown) for determining the presence or absence of defective products such as fragments and other foreign matters based on the output signal of the line sensor 32. The X-ray irradiation device 31 and the line sensor 32 are arranged to face each other with the side edge portions 5a interposed therebetween. The X-ray irradiation device 31 emits soft X-rays in a substantially horizontal direction toward the side edge portions 5a. The emitted soft X-rays pass through the side edge portions 5a, and the transmission level of the transmitted soft X-rays is measured by the line sensor 32. The signal processing unit analyzes the signal measured by the line sensor 32 and detects a defect such as a fragment of the packaged object or other foreign matter in the side edge portions 5a. When the signal processing unit detects the defect, the signal processing unit outputs a detection signal, and the detection signal is transmitted to a defective product discharge device (not shown) disposed on the downstream side of the top seal device 20. The defective product discharging apparatus discharges the packaging body 23 including the defective portion from a normal line that conveys the regular packaging body 23.

  In this embodiment, since soft X-rays are irradiated to both side edge portions 5a before being heated by the bar sealer 17b constituting the center sealer, a seal ridge formed by heating the bar sealer 17b is formed at the irradiated portion. If the foreign matter is mixed in the side edge portions 5a without being formed, the foreign matter can be detected with high accuracy. As described above, the foreign matter sandwiched between the unheated side edge portions 5a from the pinch roller 17a to the bar sealer 17b is heated and pressurized as it is and sealed, and the center seal portion 42 mixed with the foreign matter Become. On the other hand, when no fragment or other foreign matter is detected at both side edge portions 5a of the inspection target area, there is no possibility that foreign matter is mixed between the side edge portions 5a before reaching the bar sealer 17b after the inspection. For this reason, the center seal portion 42 with no seal failure is obtained. Therefore, the presence or absence of a seal failure of the center seal portion 42 can be accurately determined based on the inspection result of the X-ray inspection apparatus 30 of the present embodiment.

  Furthermore, in this embodiment, the X-ray inspection apparatus 30 includes means for preventing soft X-rays emitted from the X-ray irradiation apparatus 31 from being irradiated to the package 3. As shown by a two-dot chain line in FIG. 2C, the soft X-rays emitted from the X-ray irradiation device 31 travel with a certain spread. Therefore, for example, if an object to be packaged is present within the irradiated soft X-ray irradiation range, it is normally present. Even if the soft X-ray after transmission is detected by the line sensor, fragments and other foreign matters are detected. Not used for inspection. Therefore, soft X-rays emitted from the X-ray irradiation device 31 cannot be used efficiently for inspection, which is not preferable. Moreover, in order to suppress at least the soft X-rays emitted from the X-ray irradiation device 31 from leaking out of the pillow wrapping machine, it is necessary to shield by arranging a shielding plate or the like at an appropriate position. If the soft X-ray has a useless spread through the package as described above, a shielding plate or the like needs to be disposed in a wide area, which is not preferable because the apparatus becomes large. Furthermore, there are cases where it is not preferable to irradiate the packaged object with soft X-rays. In particular, when the packaged article is a pharmaceutical product, there may be a concern about deterioration of quality. On the other hand, in the present embodiment, since the soft X is not irradiated to the package, none of the above three problems may occur.

  The means for preventing the soft X-rays emitted from the X-ray irradiation device 31 from being irradiated to the package 3 is, for example, that the irradiation direction of the soft X-rays is obliquely downward, the upper limit of the irradiation range becomes horizontal, and For example, a shielding member that blocks the path of soft X-rays obliquely upward at a predetermined position closer to the X-ray irradiation device 31 than the package 3 is positioned below the conveyance surface of the package 3. It is preferable that the soft X-ray irradiation range is as shown in FIG.

  In the above-described embodiment, the side edge portions 5a existing between the pinch roller 17a and the bar sealer 17b are the inspection targets. However, the present invention is not limited to this. For example, the inspection is performed on the upstream side of the pinch roller 17a. May be performed. Since the pinch roller 17a sandwiches both side edge portions 5a and urges forward, the pinch roller 17a has unevenness on the side peripheral surface of the pinch roller 17a, that is, the surface that contacts both side edge portions 5a of the belt-like film 5. There is something. The pinch roller 17a having such unevenness firmly sandwiches both side edge portions 5a by the unevenness and conveys the belt-like film 5 more firmly. At this time, both side edge portions 5a sandwiched between the pinch rollers 17a may have traces of unevenness on the side peripheral surface of the pinch rollers 17a. After this unevenness, simply pressurizing and there is no heating by the sealer, so it is harder to be detected by the X-ray inspection apparatus 30 compared to a seal bottle etc., but for example, when the sensitivity is increased, the unevenness is also detected, There is a risk that it may be difficult to distinguish from fragments and other foreign matters. Therefore, as in the present embodiment, if the upstream side of the pinch roller 17a is set as the inspection region, there is no such problem, and it is only necessary to detect the presence or absence of foreign matter with higher accuracy.

  In this case, for example, as shown in FIG. 3, a pair of auxiliary rollers 35 that sandwich the side edge portions 5a may be disposed further upstream of the pinch roller 17a. For example, the auxiliary roller 35 is preferably a free roller having a flat side surface. In this way, the side peripheral edge 5a sandwiched because the side peripheral surface is flat is not formed with irregularities or the like, and the auxiliary roller 35 sandwiches the both side edge 5a, so that the upstream side of the pinch roller 17a. In this inspection region, the side edge portions 5a may be in contact with each other without being separated.

  Further, in the above-described embodiment and the modification, the example in which the both-side edge portion 5a is applied to the pillow wrapping machine is described. However, the present invention is not limited to this, for example, as shown in FIG. You may apply to the reverse pillow packaging machine in which the edge part 5a comes up. However, the normal pillow wrapping machine with the side edges 5a on the lower side is more likely to have fragments and other foreign objects entering between the side edges 5a, so that the present invention functions effectively. And the primary packaged goods which packaged the goods are also contained in the to-be-packaged goods. In this case, it is detected whether the foreign matter adhered to the packaged film, not the chip of the article to be packaged, or the foreign matter that has entered the film through the bag making device is mixed in the center seal portion.

  As described above, various aspects of the present invention have been described using the embodiments and the modifications. However, these embodiments and descriptions are not intended to limit the scope of the present invention, and are for understanding the present invention. It is added that it was provided to contribute. The scope of the present invention is not limited to the configurations and manufacturing methods explicitly described in the specification, and includes combinations of various aspects of the present invention disclosed in the present specification. Among the present inventions, the configuration for which a patent is sought is specified in the appended claims, but the present invention is disclosed in this specification even if the configuration is not specified in the claims. I would like to remind you that there is a possibility of claiming this configuration in the future.

DESCRIPTION OF SYMBOLS 1 Packing machine main body 2 Film supply apparatus 3 Packaged object 4 Packaged article conveyance supply apparatus 5 Band-shaped film 5a Side edge part 14 Cylindrical film 15 Bag making machine 17 Center seal apparatus 17a Pinch roller 17b Bar sealer 17c Press roller 20 Top seal Device 23 Package 24 Center seal portion 30 X-ray inspection device 31 X-ray irradiation device 32 Line sensor 42 Center seal portion

Claims (6)

A bag making machine for making a continuous form of the belt-like film to be formed into a cylindrical shape, and a packaged article conveying and supplying apparatus that is arranged on the upstream side of the bag making machine and conveys the article to be packaged into the bag making machine And a center seal device for applying a center seal to both side edge portions of the strip-shaped film formed in the cylindrical shape, and disposed on the downstream side of the center seal device, and the both side edge portions are center-sealed. A pillow wrapping machine provided with a top seal device for sealing and cutting in the width direction of the tubular film,
An X-ray inspection apparatus for inspecting a site where the center seal is performed,
The center seal device includes a pair of pinch rollers that sandwich and convey the edge portions on both sides, and a center sealer that is disposed on the downstream side of the pinch roller and heats and pressurizes the edge portions on both sides.
The pillow packaging machine characterized in that the X-ray inspection apparatus irradiates X-rays on both side edges on the upstream side of the center sealer.   The pillow packaging machine according to claim 1, wherein the X-ray inspection apparatus irradiates the X-rays on both side edge portions located between the pinch roller and the center sealer.   The pillow wrapping machine according to claim 1, wherein the X-ray inspection apparatus irradiates the X-rays on both side edge portions positioned on the upstream side of the pinch roller. On the upstream side of the pinch roller, provided with a pair of auxiliary rollers that sandwich the edge portions on both sides,
The auxiliary roller has a flat surface in contact with the side edges.
The pillow packaging machine according to claim 3, wherein the X-ray inspection apparatus irradiates the X-rays on both side edge portions located between the auxiliary roller and the pinch roller. .   The pillow packaging machine according to any one of claims 1 to 4, wherein the X-ray inspection apparatus includes means for preventing the object to be packaged from being irradiated. The function is to form a center seal part by sealing the continuously supplied belt-like film into a cylindrical shape with a bag making machine, and the center seal device seals both side edges of the overlapped belt-like film. An inspection method in a provided pillow packaging machine,
A method for inspecting a center seal portion formed by a pillow packaging machine, wherein the X-ray inspection apparatus irradiates a region before heating by a center sealer of the center seal apparatus with X-rays and inspects for contamination. .

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