JP6709917B2 - Pillow wrapping machine and inspection method of center seal part formed by pillow wrapping machine - Google Patents

Description

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

A pillow packaging machine, which is one form of the packaging machine, has the following configuration. First, a strip-shaped film wound around a raw film is continuously supplied to a bag-making machine, and when passing through the bag-making machine, a tubular film formed into a tubular shape is formed. Further, a packaged article conveying and supplying device is arranged on the upstream side of the bag making machine, and the packaged article conveyed at a predetermined interval from the packaged article conveying and supplying apparatus is supplied into the bag making machine. As a result, when the article to be packaged passes through the bag making machine, it is accommodated in the tubular film at predetermined intervals, and the article to be packaged is transported together with the tubular film. A center seal device and a top seal device are arranged along the carrying 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 part where the front and rear objects to be packaged do not exist) in the lateral direction of the traveling direction, and cuts the tubular film in which the object to be packaged at the tip is stored. A portion of the film is separated from the subsequent tubular film to produce a package.

If the object to be packaged is, for example, biscuits or other baked confectionery, or freeze-dried, which is relatively fragile and part of the product breaks off, the broken pieces are film-polymerized from the tubular film before sealing. There is a risk of being sealed by the center seal device while entering the end. When such a state occurs, foreign matter is mixed into the center seal portion, resulting in poor sealing, and a package with such poor sealing must be discarded as a defective product.

Therefore, for example, an inspection device is provided on the downstream side of the center seal device to inspect whether or not foreign matter is mixed in the center seal portion. When a defective product containing foreign matter is detected, a defective product discharge device arranged on the downstream side of the top seal device removes the defective product package with foreign matter mixed in the center seal portion from the non-defective product. Remove from transport line.

In the case of a package manufactured using a non-transparent packaging film such as an aluminum vapor-deposited film or a packaging film in which a relatively dark color is also printed on the center seal portion, a packaging film is not available for general optical sensors. It is conceivable to use an X-ray inspection device (including a soft X-ray inspection device) as the inspection device because the X-ray cannot pass through and defect inspection cannot be performed. Although it is not a pillow packaging machine, for example, Patent Document 1 discloses that an X-ray inspection apparatus is used to inspect a sealed state.

JP, 2016-24132, A

However, since the center seal part formed by heating and pressurizing with the center seal device is sealed by the sealer and pressed by the pinch roller and pulled forward, the streak does not appear even in a normal seal state. It may be formed or seal wrinkles may be formed. Since such seal wrinkles are not so problematic when viewed visually, they are in a normal sealing state as described above, but in the X-ray inspection apparatus, the seal wrinkles and the like have about the same foreign matter transmittance. As a result, it is impossible to determine whether the seal is a wrinkle or a foreign matter such as a fragment of the packaged object, and it is not possible to correctly detect a seal defect due to foreign matter being caught.

In order to solve the above-mentioned problems, the pillow packaging machine of the present invention is provided with (1) a bag-making device for making a continuously supplied strip-shaped film into a tubular bag, and an upstream side of the bag-making device. An object transporting/supplying device that conveys an object to be packaged into the bag making machine, a center seal device that performs center seal on both side edge portions of the tubular film made into a bag, and a center thereof. A pillow wrapping machine provided with a top seal device arranged on the downstream side of a sealing device and sealing/cutting in the width direction of the center-sealed tubular film, the center seal having: The center seal device includes a pair of pinch rollers that sandwich and convey the both side edge portions, and the both side edge portions that are arranged on the downstream side of the pinch rollers. The X-ray inspection apparatus is configured to irradiate X-rays to the both side edge portions on the upstream side of the center sealer to perform the inspection. X-rays include soft X-rays.

In the present invention, X-rays are radiated to both side edge portions of the strip-shaped films which have not been heated by the center sealer, and the presence or absence of foreign matter is inspected. Both side edge portions are heated by a center sealer after the inspection and heat-sealed to form a center seal portion. Therefore, both side edge portions before sealing are inspected, and when a foreign substance is detected, the center seal portion has a foreign substance present, and therefore, the center seal portion has a foreign substance and has a poor sealing. On the other hand, if no foreign matter is detected at both side edge portions that have been overlapped, the center seal portion is formed because the foreign matter is not mixed because it is sealed as it is. In the present invention, since X-rays are irradiated to the both edge portions before heating for inspection, seal wrinkles and the like formed by heating the center sealer are not formed at the irradiated portions, and When a foreign substance is mixed into both side edge portions, the foreign substance can be detected with high accuracy. As described above, the present invention is characterized in that the quality of the seal is inspected before the actual sealing.

(2) The X-ray inspection apparatus may irradiate the X-rays to the both side edge portions located between the pinch roller and the center sealer. With this configuration, the portions of the both edge portions to be irradiated with X-rays are sandwiched by the pinch rollers on the upstream side, and the area between the pinch rollers and the center sealer is relatively narrow. The edges on both sides move forward while maintaining the overlapped/contact state. Therefore, it is possible to minimize the possibility that foreign matter will newly enter the both side edge portions after the inspection with X-rays and that the foreign matter that existed at the both side edge portions during the inspection will come off before reaching the center sealer. Therefore, the presence or absence of a seal defect in the center seal portion can be determined with higher accuracy.

(3) It is preferable that the X-ray inspection apparatus irradiates the X-rays to the side edge portions located on the upstream side of the pinch roller. Since the pinch roller firmly sandwiches both side edge portions and applies a biasing force to the front side, irregularities are often formed on the side peripheral surface in contact with both side edge portions. By contacting, unevenness may be formed on the surfaces of both end edges. Since both side edge portions with which the pinch roller is in contact are not heated and only pressed, the unevenness formed on the surface is also lightly formed. For example, the sensitivity of X-rays was increased. In this case, the unevenness may be detected, which may affect the determination of foreign matter mixing. Therefore, by irradiating X-rays on the upstream side of the pinch roller for inspection, such a problem can be eliminated and inspection can be performed with higher accuracy.

(4) A pair of auxiliary rollers sandwiching the both side edge portions are provided on the upstream side of the pinch roller, and the auxiliary roller has a flat surface at a portion in contact with the both side edge portions, and the X-ray It is preferable that the inspection device irradiates the X-rays to the both side edge portions located between the auxiliary roller and the pinch roller. In this case, the auxiliary roller and the pinch roller are sandwiched by the auxiliary roller and the pinch roller in the front and back of the inspection area on both side edge portions on the upstream side of the pinch roller, and the state becomes taut, which allows more accurate inspection.

(5) The X-ray inspection apparatus may include means for preventing the packaged object from being irradiated. In this way, the irradiated X-rays can be efficiently used for the inspection, and there is no influence of the irradiation of the X-rays on the object to be packaged.

(6) A method for inspecting a center seal portion formed by a pillow packaging machine according to the present invention is a method in which continuously supplied strip-shaped films are formed into a tubular bag by a bag-making device, and the overlapped strip-shaped films are An inspection method in a pillow packaging machine having a function of forming a center seal part by sealing the center seal device to both end edges, wherein the X-ray inspection device heats by a center sealer of the center seal device. It is characterized in that the front area is irradiated with X-rays to inspect for foreign matter.

According to the present invention, since the X-rays are irradiated to both side edge portions of the strip film before being heated by the center sealer, the surface of the inspection area is free from seal wrinkles due to heating, and the foreign matter is mixed accurately. It is possible to inspect whether or not

It is a front view showing one suitable embodiment of the pillow packaging machine concerning the present invention. It is a figure which shows the part of the X-ray inspection apparatus and center seal apparatus which are the principal parts of this invention. It is a figure which shows a modification. It is a figure which shows another modification.

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 should not be construed as being limited to this, 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 wrapping machine main body 1, a film supply device 2 for continuously supplying a band-shaped wrapping film to the wrapping machine main body 1, and the wrapping machine main body. 1 is provided with a to-be-packaged object conveying/supplying device 4 for supplying the to-be-packaged object 3 at predetermined intervals. The item to be packaged 3 is, for example, an article (food) that is fragile and easily drops off during transportation such as biscuits and other baked confectioneries, freeze-dried noodles, and dry noodles such as ramen. Object 2 is not limited to this.

The film supply device 2 links the output of a drive motor (a motor capable of speed control such as a servomotor) not shown in the drawing to the original roll 6 obtained by winding the strip-shaped film 5 into a roll shape, and It is supplied to the packaging machine body 1 at a constant speed while appropriately controlling the rotation speed. Further, various rollers 7 (only one is shown as a representative in the figure) are arranged at predetermined positions from the original roll 6 to the packaging machine body 1, and the belt-shaped film 5 sent out from the original roll 6 Is passed over the roller 7 and guided to the packaging machine body 1 through a predetermined path. In the present invention, the drive motor does not necessarily have to be linked to the original roll 6, and a feed roller may be provided on the transport path of the packaging film and pulled out.

As the strip-shaped film 5, for example, a non-transparent film material such as an aluminum vapor-deposited film, or a film material in which relatively dark colors are also printed on both side edge portions 5a to be the center seal portion is used.

The article conveying/supplying device 4 includes a sprocket 9 arranged at the front and rear, an endless chain 10 hung over the plurality of sprockets 9, and a plurality of pushing fingers 11 attached to the endless chain 10 at a predetermined pitch. It is configured with. As a result, when the pushing finger 11 hits the rear surface of the article to be packaged 3, the article 3 to be packaged also moves forward on the transport path along with the movement of the pushing finger 11.

The packaging machine main body 1 is arranged on the downstream side of the bag making device 15 for making the supplied strip-shaped film 5 into the tubular film 14, and the film stacking end of the tubular film 14 is set in the traveling direction. A center seal device 17 for heat-sealing along, a belt conveyor 16 arranged downstream of the center seal device 17 for conveying the tubular film 14 containing the article to be packaged 3, and a predetermined position above the belt conveyor 16. The upper side restraining belt 18 arranged in the above position, the top seal device 20 arranged on the downstream side of the belt conveyor 16, and the transport conveyor device 19 arranged on the downstream side of the top seal device 20.

The bag-making device 15 is a tubular film which is formed into a tubular shape by passing the strip-shaped film 5 continuously supplied from the film supply device 2 to contact and superpose both side edge portions 5a of the strip-shaped film 5 with each other. Make bags in 14. Further, the articles 3 to be packaged, which are sequentially supplied from the article-conveying and supplying device 4 to the packaging machine body 1, are fed into the bag making machine 15. As a result, the articles 3 to be supplied to the bag making device 15 are arranged in the tubular film 14 at predetermined intervals.

The center seal device 17 seals both side edge portions 5a of the polymerized strip film 5. The center seal device 17 heat-seals by heating the strip-shaped film 5 while sandwiching both side edge portions 5a from both sides. More specifically, as shown in an enlarged manner in FIG. 2, the center seal device 17 includes a pair of pinch rollers 17a that sandwich a portion where both the side edge portions 5a are overlapped with each other to give a conveying force, and a pair of the pinch rollers 17a. A pair of square bar-shaped bar sealers 17b for sandwiching and heat-sealing the cut part from both sides, and arranged on the downstream side of the bar sealer 17b, pressurizing and cooling the overlapped parts of the side edges of the heated and melted film. And a pair of press rollers 17c that complete the heat sealing. The bar sealer 17b and the press roller 17c form a center sealer. Further, in the present embodiment, the center sealer including the bar-shaped bar sealer 17b and the press roller 17c is used, but a roller type center sealer arranged on the left and right with the both end edge portions 5a sandwiched may be used. The roller type heats and pressurizes.

The press roller 17c also has a function as a pinch roller. That is, since the press roller 17c rotates in synchronization with the center seal portion 42 sandwiched by a predetermined pressure, the press roller 17c 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 pinch rollers are arranged before and after the bar sealer 17b.

The upper side restraint belt 18 is disposed immediately upstream of the top seal device 20, and restrains the article 3 to be packaged 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 traversing the film. The top seal device 20 of the present embodiment is of a so-called box motion type, and a predetermined pair of top sealers 21 and 22 arranged vertically maintain a state in which their seal surfaces 21a and 22a face each other. A drive mechanism for revolving around the locus is provided. Both top sealers 21 and 22 operated by this drive mechanism move closer to each other from a reference position separated by a predetermined distance to sandwich the tubular film 14 from above and below, thereby removing the film portion in contact with the sealing surfaces 21a and 22a. It is pressurized and heated at a predetermined pressure. Then, the top sealers 21 and 22 move forward in the moving direction of the tubular film 14 while maintaining the state where the tubular films 14 are held close to each other as described above. The moving speed at this time is made equal to the moving speed of the tubular film 14. Both top sealers 21, 22 move away from each other when they move a predetermined distance, and move in the direction opposite to the moving direction of the tubular film 14 to reach the reference position.

Thus, the top seal device 20 of the present embodiment has a function of moving both top sealers 21 and 22 up and down and a function of moving back and forth along the moving direction of the tubular film 14. The drive mechanism for performing such a function may be, for example, one that transmits the power of one drive source to both top sealers 21 and 22 via a power transmission mechanism such as a cam and 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/cut by the top sealers 21 and 22 is a predetermined position between the front and rear objects 3 to be packaged. As a result, by passing through the top seal device 20, the leading portion of the tubular film 14 is separated from the subsequent portion, and the package 23 is manufactured.

Here, in the present embodiment, the X-ray inspection apparatus 30 is arranged at a predetermined position on the upstream side of the bar sealer 17b of the center seal device 17. The X-ray inspection apparatus 30 of the present embodiment irradiates soft X-rays to both side edge portions 5a of the overlapping strip-shaped films 5 before center sealing, which is an inspection target area, and detects the soft X-rays that have passed through the inspection target area. The strength is detected to detect the mixture of foreign matter such as fragments of the article to be packaged 3.

That is, both side edge portions 5a of the belt-shaped film 5 formed into a tubular shape by the bag making device 15 project outward and downward from the bottom surface of the bag making device 15 and are in contact with each other in a suspended state and overlap each other. In this state, the both edge portions 5a are sandwiched by the pair of pinch rollers 17a from the left and right sides, and are subjected to a forward conveying force, and are moved forward as they are, and are heated and melted and softened by the bar sealer 17b. The both side edge portions 5a are heated by the center sealer 17b and then sealed by being pressed and cooled by the downstream press roller 17c to form the center seal portion 24. The center seal portion 24 is then tilted down, displaced along the bottom surface of the tubular film 14, and conveyed in that state.

The packaged object 3 of the present embodiment is fragile and a part thereof may drop as a fragment, and the fragment is sandwiched between the overlapping side edge portions 5a depending on the falling position. When the pinched piece passes through the press roller 17c through the pinch roller 17a and the bar sealer 17b in this sandwiched state, the sandwiched piece remains sealed in the center seal portion 24, resulting in poor sealing. Particularly, 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 the two in a relatively taut state. Therefore, the fragments sandwiched between the both side edge portions 5a thereafter pass through the bar sealer 17b without dropping or separating to the outside of the both side edge portions 5a, that is, outside, and reach the press roller 17c. Therefore, as described above, the pieces sandwiched between the both end edge portions 5a remain in the center seal portion 24 as they are. In addition to the above-mentioned fragments of the article to be packaged 3, various foreign substances may enter between the both side edge portions 5a.

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

In the present embodiment, since the soft X-rays are irradiated to both side edge portions 5a before being heated by the bar sealer 17b constituting the center sealer, seal wrinkles and the like formed by heating the bar sealer 17b are irradiated at the irradiated portion. If the foreign matter is not formed and is mixed in both side edge portions 5a, the foreign matter can be detected with high accuracy. Then, as described above, the foreign matter sandwiched between the unheated both 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 foreign matter is mixed with the center seal portion 42. Become. On the other hand, if no fragments or other foreign matter is detected at both side edge portions 5a of the inspection target area, there is no possibility that foreign matter may enter between the both side edge portions 5a before reaching the bar sealer 17b after the inspection. Therefore, the center seal portion 42 has no defective seal. Therefore, based on the inspection result of the X-ray inspection apparatus 30 of the present embodiment, it is possible to accurately determine whether the center seal portion 42 has a seal defect.

Further, in the present embodiment, the X-ray inspection device 30 includes means for preventing the soft X-rays emitted from the X-ray irradiation device 31 from irradiating the package 3. As shown by the chain double-dashed 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 exists within the irradiation range of the emitted soft X-rays, it is normally present, and even if the soft X-rays after transmission are detected by the line sensor, fragments and other foreign matter are not detected. Not used for inspection. Therefore, the soft X-rays emitted from the X-ray irradiation device 31 cannot be efficiently used for inspection, which is not preferable. Further, the soft X-rays emitted from the X-ray irradiation device 31 need to be shielded by arranging a shielding plate or the like at an appropriate position in order to prevent the soft X-rays from leaking out of the pillow packaging machine at least. However, if the soft X-rays have a wasteful spread that penetrates the object to be packaged as described above, it is necessary to dispose a shielding plate or the like in a large area, which undesirably increases the size of the apparatus. Further, there are cases where it is not preferable to irradiate the packaged item with soft X-rays, and there is a concern that the quality may deteriorate, particularly when the packaged item is a pharmaceutical product. On the other hand, in the present embodiment, since the object to be packaged is not irradiated with the soft X, none of the above three problems may occur.

A means for preventing the soft X-rays emitted from the X-ray irradiation device 31 from irradiating the object to be packaged 3 is, for example, such that the irradiation direction of the soft X-rays is obliquely downward and the upper limit of the irradiation range becomes horizontal. For example, a shielding member that blocks the course of the soft X-rays obliquely upward may be located below the transport surface of the package 3 or at a predetermined position on the X-ray irradiation device 31 side of the package 3. By arranging them, the irradiation range of the soft X-rays may be set as shown in FIG.

In the above-described embodiment, the both side edge portions 5a existing between the pinch roller 17a and the bar sealer 17b are the inspection targets, but the present invention is not limited to this, and 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 it forward, the side circumferential surface of the pinch roller 17a, that is, the surface that contacts both side edge portions 5a of the strip film 5 is formed with irregularities. There is something. The pinch roller 17a having such irregularities firmly sandwiches the side edge portions 5a by the irregularities, and conveys the strip film 5 more firmly. At this time, both side edge portions 5a sandwiched between the pinch rollers 17a may have imprints on the side peripheral surface of the pinch roller 17a. After this unevenness, since it is simply pressurized and there is no heating by the sealer, it is more difficult to be detected by the X-ray inspection apparatus 30 compared to a seal wrinkle, but if the sensitivity is increased, the unevenness is also detected, There is a risk that it will be difficult to distinguish from fragments and other foreign matter. Therefore, if the upstream side of the pinch roller 17a is set as the inspection area as in the present embodiment, there is no such problem, and it is possible to detect the presence or absence of foreign matter more accurately.

In this case, for example, as shown in FIG. 3, it is preferable to arrange a pair of auxiliary rollers 35 that sandwich the both end edge portions 5a on the upstream side of the pinch roller 17a. The auxiliary roller 35 may be a free roller, for example, having a flat side peripheral surface. In this way, no unevenness is formed on both side edge portions 5a sandwiched by the side peripheral surface being a flat surface, and the auxiliary roller 35 sandwiches both side edge portions 5a, so that the upstream side of the pinch roller 17a It is preferable that both side edge portions 5a are in contact with each other in the inspection region without being separated.

Further, in the above-described embodiment and modified example, the example in which the both side edge portions 5a are applied to the pillow packaging machine below is described, but the present invention is not limited to this, and for example, as shown in FIG. It may be applied to a reverse pillow packaging machine in which the edge 5a is on the upper side. However, since a normal pillow packaging machine in which both side edge portions 5a are located below is more likely to cause fragments and other foreign matter to enter between the both side edge portions 5a, the present invention may function effectively. The items to be packaged also include primary packages in which the items are packaged. In this case, it is detected whether the center seal portion is contaminated with a foreign substance adhering to the film being packaged, not a fragment of the packaged object, and entering the film through the bag-making device.

Although various aspects of the present invention have been described above by using the embodiments and the modifications, these embodiments and explanations are not made for the purpose of limiting the scope of the present invention, and an understanding of the present invention will be provided. It should be 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 also includes combinations of various aspects of the present invention disclosed in the present specification within the scope. Of the present invention, the configuration for which a patent is sought is specified in the appended claims, but even if the present location is not specified in the claims, it is disclosed in the present specification. Just in case, I would like to state that there is a possibility that I will patent the structure in the future.

1 Packaging Machine Main Body 2 Film Supply Device 3 Packaged Object 4 Packaged Object Transport Supply Device 5 Strip Film 5a Side Edge 14 Cylindrical Film 15 Bag Maker 17 Center Seal Device 17a Pinch Roller 17b Bar Sealer 17c Press Roller 20 Top Seal Device 23 Package 24 Center seal part 30 X-ray inspection device 31 X-ray irradiation device 32 Line sensor 42 Center seal part

Claims (6)

A bag-manufacturing device for manufacturing a continuously supplied strip-shaped film into a tubular shape, and a package-carrying and feeding device that is arranged on the upstream side of the bag-manufacturing device and transports a packaged product into the bag-making device And a center seal device for center-sealing both side edge portions of the tubular film formed into a tubular shape, and a center seal device disposed downstream of the center seal device, wherein the both side edge portions are center-sealed. A pillow packaging machine equipped with a top seal device for sealing and cutting in the width direction of a tubular film,
An X-ray inspection device for inspecting the portion where the center seal is attached,
The center seal device includes a pair of pinch rollers that sandwich and convey the both side edge portions, and a center sealer that is disposed on the downstream side of the pinch rollers and that heats and pressurizes the both side edge portions,
The pillow packaging machine is characterized in that the X-ray inspection device irradiates X-rays to the both end edges on the upstream side of the center sealer to inspect. The pillow wrapping machine according to claim 1, wherein the X-ray inspection apparatus irradiates the X-rays to the side edge portions located between the pinch roller and the center sealer. The pillow packaging machine according to claim 1, wherein the X-ray inspection apparatus irradiates the X-rays to the both side edge portions located on the upstream side of the pinch roller. On the upstream side of the pinch roller, a pair of auxiliary rollers sandwiching the both end edge portions are provided,
The auxiliary roller has a flat surface at a portion in contact with the both end edges.
The pillow packaging machine according to claim 3, wherein the X-ray inspection apparatus irradiates the X-rays to the 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 irradiation of the article to be packaged. A function of forming a center seal part by sealing the continuously supplied strip-shaped film into a tubular shape with a bag-making device and sealing the both side edges of the overlapped strip-shaped films by a center seal device. An inspection method in a pillow packaging machine provided with,
An X-ray inspection apparatus irradiates X-rays to a region before heating by a center sealer of the center seal device to inspect foreign matters for inspecting a center seal portion formed in a pillow packaging machine. ..

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