JPH0413224B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The packaging bag for shavings of the present invention is used for hermetically packaging shavings, and wrinkles do not occur in the area that is heat-sealed after storing the shavings. Check for defective factors that may impede the airtightness of the heat-sealed part, such as whether there are any cracks in the heat seal, whether there are any shavings caught in the same area, or whether there are air bubbles trapped in the same area. suitable for detection.

(Prior Art) It has become common for dried bonito flakes to be packaged in small bags containing several grams each and suitable for one-time consumption.

In this type of pack product, after filling the packaging bag with bonito flakes through the storage opening, the bag is replaced with an inert gas, and the storage opening is sealed by heat sealing. In this case, as shown in Figure 9, if the heat-sealed part B is wrinkled E, shavings are pinched, or air bubbles F are enclosed, the sealing of the heat-sealed part B will be incomplete and the bag will leak from that area. There are problems such as air getting inside the bag or inert gas leaking inside the bag, deteriorating the quality of the dried bonito flakes, making long-term storage difficult, and reducing the product value due to poor appearance. be.

Therefore, conventionally, defective products have been checked by visually inspecting the heat-sealed part B for wrinkles, pinched shavings, etc.

(Problems with conventional technology) In the past, heat-sealed pack products were picked up one by one and inspected with the human eye, which resulted in problems such as slow inspection speed and variations depending on the person inspecting. Ta.

To solve this problem, it is conceivable to use both optical means and electric means to automatically detect wrinkles in the heat-sealed portion B, pinching E of cut knots, and the like. However, in this case, if both the heat-sealed part B of the packaging bag A for shavings A and the storage part C inside thereof are transparent, it is difficult to distinguish between the heat-sealed part B and the storage part C. If the position of the shavings is shifted or tilted, not only the original defective product such as wrinkles E in the heat sealing part B, shavings of shavings being caught, and air bubbles F being enclosed, but also the shavings of shavings D stored in the shavings packaging bag A. may also be detected as defective products.

(Object of the Invention) The object of the present invention is to provide a method that is convenient for detecting wrinkles E, pinching of shavings, or inclusion of air bubbles F (hereinafter referred to as defective factors) in the heat-sealed part B using light, electricity, etc. The purpose of the present invention is to provide a packaging bag for shavings.

Another object of the present invention is to make the heat-sealed part B of the packaging bag A for shavings transparent as well as the storage part C inside thereof, and to make it transparent even if the packaging bag A for shavings A is displaced or tilted during detection. The object is to be able to reliably detect only the cause of deterioration in the heat-sealed part B.

Still another object of the present invention is to provide a packaging bag for shavings in which at least the heat-sealed part B of the storage opening is translucent, so that the parts other than the sealed part B are vapor-deposited with aluminum and become opaque, or colored. To make it possible to reliably detect the cause of a defect in a heat-sealed part B even if it is opaque due to a pattern.

(Means for Solving the Problems) As shown in FIG. 1, in the packaging bag for shavings of the present invention, both peripheral edges 20a, 20c and a bottom 20b are heat-sealed, and the contents are sealed on the side opposite to the bottom 20b. In a packaging bag in which a storage opening 1 to be filled is opened and the storage opening 1 is filled with bonito flakes and then heat-sealed, at least both or either of the front and back surfaces of the heat-sealed portion 6 of the storage opening 1 is used. One side is formed to be translucent, and both outer sides 3a, 3 of the same heat sealing part 6
Inspection marks 4a and 4b for inspecting the sealing condition of the heat-sealed portion 6 are displayed on b, and the inner edges 30 of the inspection marks 4a and 4b are closer to the inner edge 6a of the heat-sealed portion 6 of the storage opening 1. It is characterized by being displayed so that it does not enter inside.

(Operation) Store shavings in the packaging bag 2 for shavings of the present invention through its storage opening 1 and heat-seal the storage opening 1, and check whether there are wrinkles or shavings (for example, shavings) caught in the heat-sealed portion 6. For example, to check for defects such as whether air bubbles are included or not, do as follows.

A pack product 7 (Fig. 3) made by storing shavings from the storage opening 1 into the packaging bag 2 for shavings of the present invention and heat-sealing the storage opening 1 is conveyed, for example, by a conveyor, and during transportation, the pack product is 7 is irradiated with light 10 from a light source 8. The state of the pack product 7 at this time is photographed with a video camera 9 fixed at a predetermined position, and among the scan lines of the photographed image, a scan line 50 of the heat sealing part 6 and its both outer sides 3a and 3b is shown.
The cause of the defect is detected by detecting the signal level shown in FIG. 6.

In this case, the signal level of the scanning line 50 changes depending on whether the light 10 is reflected or not. For example, if there is no defective factor in the heat sealing part 6, the light 10 will be reflected by the inspection marks 4a and 4b, but will not be reflected between the inspection marks 4a and 4b. As shown in Figure A, the reflected lights A and B from the inspection marks 4a and 4b
is detected at a high level.

If there is a defective factor in the heat sealing part 6, the light 10 emitted from the light source 8 will not only be reflected by the inspection marks 4a and 4b, but also reflected by the defective factor. Changes in the reflected light between the sandwiched inspection marks 4a and 4b appear as changes in the signal level of the scanning line 50 in FIG. 5B. That is, the reflected lights A and B by the inspection marks 4a and 4b,
The level of the reflected light C due to the defective factor becomes high.

In any of the above cases, inspection marks 4a, 4b
Reflected lights A and B are detected, which means that the scanning line 50 is always at the position of both inspection marks 4a and 4b as shown in FIG. It is nothing other than being in its normal position. Therefore, in this case, inspection mark 4
This means that it is possible to detect the cause of the failure of the heat seal portion 6 between a and 4b.

If one or both of the two reflected lights A and B shown in FIG. 5 are not detected, it means that the pack product 7 is not in the correct position. If the reflected light A is not detected, for example, the pack product 7 is tilted to the left and the inspection mark 4a is not detected as shown in FIG.
may deviate from the scanning line 50.

A case where both the reflected lights A and B are not detected is, for example, as shown in FIG.
0, or conversely, the pack product 7 may fall too far down and both the inspection marks 4a and 4b may be off the scanning line 50.

In the cases shown in FIG. 6 B and C, the pack product 7 is not in the correct position, so even if reflected light is detected, it may be due to a defect in the seal part 6, or it may not be displayed on the shavings packaging bag 2. It is unclear whether this is due to the display unit 5. Therefore, in this case, the cause of the defect cannot be determined. In this case, the product is inspected again to determine whether it is a good product or a defective product.

Therefore, as shown in Figure 5 B, two inspection marks 4 are
Only when the reflected light C hits between the reflected lights A and B from a and 4b, it is determined that there is a defective factor in the heat sealing part 6.

(Example) FIG. 1 shows an example of a packaging bag for shavings according to the present invention. This packaging bag 2 for shavings is made of transparent plastic film, and has peripheral edges 20 on both sides.
a, 20c and the bottom 20b are heat sealed,
Only the other outer peripheral edge is opened to form the storage opening 1.

Broken lines 70 in FIGS. 1, 2, 7, and 8 and solid lines 70 in FIG. 6 indicate the inner edges of the heat-sealed portions of the both side peripheries 20a and 20c and the bottom 20b of the shavings packaging bag 2.

The packaging bag 2 for shavings does not necessarily have to be entirely transparent, and may be, for example, as shown in FIGS. 13 to 17.

In each of the packaging bags 2 for shavings shown in FIGS. 13 to 16, only the heat-sealed portion 6 of the front film 2a is transparent, and the other parts are aluminum evaporated on the inner surface of the front film 2a and the inner surface of the back film 2b. In addition, patterns, figures, characters, etc. are printed on the front and back sides of both films, making them opaque.

In each of the packaging bags 2 for shavings shown in FIG. 13 to FIG.
The other parts of both films 2a and 2b are made opaque by having aluminum vapor-deposited on the inner surface and having patterns, figures, characters, etc. printed on the front and back surfaces.

Note that the reference numeral 60 formed in the center of the packaging bag 2 for shavings in FIGS. 13 to 16 is a viewing window that is left transparent without aluminum deposition or printing.

In the packaging bag 2 for dried bonito flakes shown in FIG.
In addition, patterns, figures, characters, etc. are printed on the front and back surfaces, making them opaque, and the peripheral edge 80b outside the solid line 80 and the heat-sealed portion 6 are transparent.

The packaging bag 2 for shavings 2 shown in FIG. It is printed so that it is opaque, and the peripheral edge 80b and the heat-sealed part 6 outside the solid line 80 and the peripheral edge 90b and the heat-sealed part 6 outside the chain line 90 are transparent.

The inspection marks 4a and 4b are for inspecting the sealing state of the heat sealing part 6, and are displayed on both outer sides 3a and 3b of the heat sealing part 6. Also,
The inner end portions 30 of the inspection marks 4a and 4b are the second
As shown in the figure, it is displayed so that it does not enter inside the inner end 6a of the heat sealing part 6.

By the way, as shown in Figure 7, the inspection marks 4a, 4
The inner end 30 of b is the inner end 6a of the heat sealing part 6.
When it goes further inside, the pack product 7 being conveyed is tilted as shown in FIG.
0, or even if the pack product 7 being conveyed shifts upward and the heat seal part 6 deviates from the scanning line 50 as shown in FIG. Since the reflected light is reflected by the heat-sealed portion 6, it is impossible to determine whether the reflected light is caused by the stored shavings.

Although the illustrated inspection marks 4a, 4b are shown as thick lines, the inspection marks 4a, 4b may have other shapes, for example, they may be rectangular and solid. If it is linear, its length L
(Fig. 8) varies depending on the size of the packaging bag 2 for shavings, the width W of the heat sealing part 6 (Fig. 8), etc.
For example, in the case of a packaging bag 2 for shavings with a length of about 13 cm and a width of about 10 cm, the heat-sealed portion 6 is in a range of about 2 to 15 mm, so it is preferable to select a bag within approximately the same range.

In the case of FIG. 2, the inspection marks 4a and 4b are displayed not only on both outsides of the heat-sealed portion 6 of the storage opening 1, but also on the bottom sealed portion 20b of the packaging bag 2 for shavings. However, it is not necessary for the sealing portion 21b of the bottom 20b. However, this bottom seal part 2
0b is also transparent and has inspection marks 4 on both sides.
a, 4b are displayed, and the inspection marks 4a, 4b are displayed.
The inner end 30 of the bottom 20b is displayed so that it does not enter inside the inner end 21b of the seal portion 21a of the bottom 20b.

Note that the heat-sealed part 6 of the packaging bag 2 for shavings is sealed after storing the shavings from the storage opening 1, so the heat-sealing part 6 is not in the original sealing position (inner end 6a) as shown in FIG. 11, for example. (the position indicated by the dashed line), or the 12th
As shown in the figure, it has been said that the heat-sealed part 6 becomes oblique and deviates from the original heat-sealed position (inner end 6a is at the position indicated by the dashed line), but even in that case, the inspection mark 4a, 4b inner end 30
It is preferable to display the mark so that it does not enter inside the inner end 6a of the seal portion 6.

40 in Fig. 2 is a direction discrimination mark, which is used to determine whether the inside and outside of the shavings packaging bag 2 is reversed, and whether the top and bottom of the shavings shavings packaging bag 2 is not upside down. belongs to. In this way, it is possible to determine whether the seal portion 6 is caught and the direction at the same time. In this case, since the direction discrimination mark 40 is always on the seal part 21b side of the bottom 20b, both the seal part 21b and the heat seal part 6 are inspected at the same time, and two or more signals are detected in both seal parts. It can be determined that it is defective only when

In the present invention, this direction discrimination mark 40 is not necessarily required, but it is more convenient to have it. The direction discrimination mark 40 in FIG.
is displayed. The direction determining mark 40 is located on a straight line connecting the left and right inspection marks 4a, 4b, and is displayed at a position shifted by l to the right from the midpoint of the inspection marks 4a, 4b. By determining the position of this direction determining mark 40 using appropriate optical means or electrical means, it is possible to determine whether the pack product 7 is up or down or front or back.

In the above explanation, light 10 is irradiated from the light source 8 to the heat-sealed part 6 of the pack product 7 and its both outer sides 3a and 3b, and the state of the reflected light at that time is observed by the video camera 9.
, and one scanning line 50 is taken out of the multiple scanning lines of the heat-sealed part 6 of the shavings packaging bag 2 and its both outer sides 3a and 3b from among the scanning lines of the photographed image. The change in the signal level of the scanning line 50 is detected to detect the cause of the failure of the heat-sealed portion 6, but the method for detecting these using the packaging bag for shavings of the present invention is as follows.
As shown in FIG.
It is also possible to extract a plurality of scanning lines 50 from among the large number of scanning lines in portions a and 3b, and detect changes in the signal level of each of these scanning lines 50.

In this way, the detection width of the heat-sealed portion 6 becomes wider, so that it is also possible to determine the size of the shavings sandwiched in the heat-sealed portion 6. Therefore, in this case, for example, if the pinched bonito flakes are so small that no air can enter from that part, even if the bonito flakes are pinched, there is no problem in maintaining the quality of the bonito flakes, so the product should be determined to be good. You can also do it. In this way, all products with pinching will not be determined as defective products, so there will be no waste in the determination and the efficiency of determination will be improved.

Furthermore, since the number of scanning lines 50 to be detected is large, even if there is a large deviation or inclination of the package product 7, there is a possibility that both inspection marks 4a and 4b will fall on any one of the plurality of scanning lines 50. growing. Therefore, when inspecting with a single scanning line, if the pack product 7 is slightly shifted or tilted, the scanning line will deviate from the inspection marks 4a and 4b and the inspection will not be possible (it will not be subject to inspection) and will be re-inspected. However, this is not the case in many cases, and the inspection target range is expanded and efficient inspection is possible.

(Effects of the Invention) The packaging bag for shavings of the present invention has the following effects.

Since the inspection marks 4a and 4b are displayed on both outer sides 3a and 3b of the heat-sealed part 6 of the storage opening 1, the packaged product 7 being transported is tilted as shown in FIG. 6B, and the heat-sealed part 6 is If the package product 7 being transported moves upwards and the heat-sealed part 6 comes off the scanning line 50 as shown in FIG.
Does not hit a or 4b, but both inspection marks 4a and 4b
There is no reflected light from. Therefore, when the reflected light from both the inspection marks 4a and 4b is detected, a defective factor such as wrinkles, shavings, or air bubbles in the heat-sealed portion 6 is detected, and the reflected light from both the marks 4a and 4b is detected. If no light is detected, it means that a portion other than the heat seal portion 6 is being inspected. Therefore, it is possible to determine whether or not the heat-sealed portion 6 has been properly inspected.

Since the inner end portions 30 of the inspection marks 4a and 4b are prevented from entering inside the inner end portion 6a of the heat sealing portion 6 of the storage opening 1, not only the heat sealing portion 6 but also the inside of the heat sealing portion 6 Even if the storage part C (Fig. 9) is transparent, the heat seal part 6
It is possible to accurately distinguish between reflections due to defective factors and reflections due to shavings stored in the packaging bag 2 for shavings. Therefore, the cause of the defect in the heat-sealed portion 6 can be reliably determined, and reflections from areas other than the heat-sealed portion 6 will not be treated as defective products of the heat-sealed portion 6. Therefore, products that should originally be good products are not treated as defective products due to misalignment during transport of the packaged products 7, and the number of defective products increases unnecessarily.

Since the inner ends 30 of the inspection marks 4a and 4b are prevented from entering inside the inner end 6a of the heat-sealed part 6 of the storage opening 1, the shavings packaging bag 2 is as shown in FIGS. 13 to 17. Even if only the heat-sealed portion 6 is transparent and the other portions are opaque, as shown in A and B, it is possible to reliably identify reflections caused by defects in the heat-sealed portion 6.

Since at least the heat-sealed portion 6 of the storage opening 1 is made translucent, it is possible to reliably detect reflected light due to a defect in the heat-sealed portion 6.

Since the cause of the failure of the heat-sealed portion 6 can be automatically detected optically and electrically, the detection processing speed is greatly improved.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an example of the packaging bag for shavings of the present invention, Fig. 2 is a front view of the same packaging bag for shavings, Figs. 3 and 4 are illustrations for explaining the inspection of pack products, and Fig. 5 Figure 6 is a diagram of the detected waveform in the normal state, B is the detected waveform diagram in the case of a defect, Figure 6 is an explanatory diagram of the position of the pack product, A is an explanatory diagram in the normal state, B is an explanatory diagram in the case of tilting to the left, and H is an explanatory diagram of the position of the pack product. 7 and 8 are explanatory diagrams showing the relationship between inspection marks and frames and patterns, and Fig. 9 is a schematic explanatory diagram of defective product detection.
Fig. 10 is an explanatory diagram of scanning lines, Figs. 11 and 12 are explanatory diagrams of different states of the heat sealing part, and Figs.
17A and 17B are explanatory diagrams showing different examples of the packaging bag for dried bonito flakes of the present invention. 1 is a storage opening, 2 is a packaging bag for shavings, 3a, 3b
are both outside, 4a and 4b are inspection marks, 6 is the heat sealing part, 6a is the inner end of the heat sealing part, 20a,
20c is the periphery on both sides, 20b is the bottom, and 30 is the inner edge of the inspection mark.

Claims (1)

[Claims] 1 Both side peripheral edges 20a, 20c and the bottom 20b are heat-sealed, and a storage opening 1 for filling the contents is opened on the side opposite to the bottom 20b, and the storage opening 1 is heat-sealed after being filled with bonito flakes. In the packaging bag, at least both or one of the front and back surfaces of the heat-sealed portion 6 of the storage opening 1 is formed to be transparent, and the heat-sealed portion 6 is formed on both outer sides 3a and 3b of the heat-sealed portion 6. Inspection mark 4 to inspect seal condition
a and 4b are displayed, and the same inspection marks 4a and 4b are displayed.
A packaging bag for shavings characterized in that the inner end 30 of the storage opening 1 is displayed so as not to go inside the inner end 6a of the heat-sealed part 6 of the storage opening 1.