JPS6333237A - Method of inspecting seal of packaging bag - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for inspecting a seal portion of a packaging bag.

[Conventional technology and its problems]

The packaging material is a moisture-proof plastic film laminated with aluminum foil, and the packaging material is intermittently fed in the length direction, and during transport, the packaging material is folded in half or three in the width direction, and the side edges overlap each other. Each time the transfer of the flat cylindrical body formed by the seal is stopped, the operation of sealing the cylindrical body in the width direction, the operation of cutting the sealed part in the width direction, and the operation of inserting the packaged object into the inside of the cylindrical body are performed. 2. Description of the Related Art Automatic packaging machines have conventionally existed that alternately repeat filling operations to package items.

In the case of products formed using two-legged automatic packaging machines, the packaging that encloses the packaged items is formed by a seal of the packaging material, so if the seal is incomplete, the packaged items may be exposed to moisture. It is necessary to inspect the seal of the package to see if it is in good condition.

By the way, in the past, the method of manually pressurizing the package to determine whether the seal was good or not was very time-consuming, and even automatic packaging machines with high productivity were operated at low efficiency. There is the inconvenience of having to do so.

Furthermore, since the inspection is performed manually, there are many inspection errors, and products with defective seals may be sold.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a seal inspection method that eliminates the above-mentioned disadvantages and allows accurate and efficient determination of the quality of the seal portion of a package.

[Structure of the invention]

In order to achieve the above object, this invention places a packaging bag in a container equipped with an openable and closable lid body, and seals the inside of the pressure-resistant container. After the pressure was reduced, the inside of the pressure-resistant container was returned to atmospheric pressure and the packaging bag was removed.

Here, when reducing the pressure of the pressure-resistant container, it is preferable to bring it into a vacuum or near-vacuum state. By placing a package in a pressure-resistant container in such a reduced pressure state, the package expands due to the pressure difference between the inside and outside, and if the seal is weak, the seal may tear and the seal may fail. If it is perfect, the air inside will be sucked out and the package will shrink, so by checking the condition of the packaging bag, you can accurately judge whether the seal is good or bad.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in the figure, the pressure-resistant container 1 includes three storage sections 2.3, and the openings 1 of the storage sections 2 are located at opposing positions. The opening force is held in two directions.

A lid 3 that opens and closes the opening of the storage section 2 is rotatably supported by the pressure container 1 and can be opened and closed by the operation of a cylinder 4.

When the lid 3 is fully closed, the storage section 2 is maintained in a sealed state.

The pressure container 1 is rotatably supported around a support shaft 5 passing through both side plates. Further, a cylinder 6 that fits on the outside of the support shaft 5 is fixed to the side plate of the pressure vessel 1, and a rack 8 engages with a pinion 7 fixed to the cylinder 6, and the rack 8 is connected to a cylinder 9. When the pressure vessel 1 is reciprocated by the operation of the pressure vessel 1, the pressure vessel 1 rotates.

Note that the support mechanism for the pressure vessel 1 and the rotation mechanism for rotating the pressure vessel 1 are not limited to those in the embodiment.

A suction passage 10 is formed at the axial center position of the support shaft 5,
A vacuum pump 12 is connected to a pipe 11 connected to the end of the suction passage 10. Further, a suction hole 13 communicating with the suction passage 10 is formed on the outer circumferential surface of the support shaft 5, and by operating the vacuum pump 12, the pressure vessel
The storage section 2 of the storage section 2 can be depressurized.

Now, put the package inside the storage part 2 with the opening facing two ways, and with the lid 3 closed, pressurize the pressure container 1
When rotated by 0°, the storage section 2 in which the package A is stored communicates with the suction hole 13. Therefore, when the vacuum pump 12 is operated to reduce the pressure in the storage section 2 to a vacuum or near-vacuum state, the package A expands due to the pressure difference between the inside and the outside. At this time, if the seal in the seal part of the package A is weak, the defective seal part will tear, and if the seal part is incomplete, the air inside the package A will be sucked, causing the package A to contract.

Therefore, by rotating the lid 3, the package A is removed from the storage section 2.
By taking out the package and visually observing the condition of the package, it is possible to determine whether the seal is good or bad.

In addition, when inspecting the seal part of the package A, when the package A is discharged from one storage section 2, the package A is placed in the other storage section 2.
The package A is continuously inspected.

The package A discharged from the storage section 2 is transferred to the belt conveyor 14
Transported to the destination using transport equipment such as

In the case of the embodiment, the pressure-resistant container is shown as having a rectangular shape and having two storage sections, but the configuration of the pressure-resistant container is not limited to this. For example, a pressure-resistant container may be made into a cylinder and have lids that can be opened and closed on both sides, and when one lid is opened, a package is supplied inside, and when the other lid is opened, the expanded package is discharged. You can.

In addition, the pressure-resistant container is rotatably supported in a circular shape, and a plurality of storage sections that open on the outer circumferential surface of the pressure-resistant container are formed at equal intervals on the outer periphery of the pressure-resistant container, and a lid that can be opened and closed is provided on the opening of each storage section. A body may also be provided.

In this case, the pressure container is rotated in one direction, and the package is supplied from above the outer periphery of the pressure container to the storage section and conveyed to the lower part.
During transportation, the pressure in the storage section is reduced, and the expanded sealed package is discharged at the lower part of the outer periphery of the pressure container.

As in the example, if the pressure container is rotatably supported and the package supplied to the storage section of the pressure container is rotated 180 degrees and discharged, the package will be reversed and the inside will be exposed. Items to be packaged can be uniformly dispersed.

〔effect〕

As described above, in the present invention, the packaging body is stored in the storage part of a pressure-resistant container, and the pressure in the storage part is reduced, so that the packaging bag expands due to the pressure difference between the inside and outside due to the pressure reduction, and the packaging bag is sealed. If the adhesive strength of the package is weak, the seal will tear, and if the seal is incomplete, the air inside will be sucked out and shrink. Can be accurately determined.

Moreover, since the packaging bag will shrink even if there is a pinhole in the packaging bag, the presence or absence of pinholes can be inspected at the same time.

Furthermore, since the inspection can be carried out by simply supplying the package into a pressure-resistant container and removing the package after the pressure inside the container is reduced, the inspection can be carried out extremely efficiently.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an inspection device used in the method of the present invention, and FIG. 2 is a sectional view of the same pressure-resistant container. 1...Pressure container, 3...Lid, A...
...Packaging bag.

Claims (1)

[Claims] A packaging bag is placed in a container equipped with an openable and closable lid, the inside of the pressure-resistant container is sealed, and the pressure inside the pressure-resistant container is reduced to a pressure that causes the packaging bag to expand, and after the pressure is reduced, the inside of the pressure-resistant container is returned to atmospheric pressure. A packaging bag seal inspection method in which the packaging bag is removed.