JP2837338B2 - Leak inspection device for sealed package - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defective sealing such as a pinhole which occurs in a sealed package enclosing contents such as food or medicine containing a liquid or a viscous substance (hereinafter referred to as a liquid in this specification). The present invention relates to a leakage inspection device for a sealed package for inspecting a leak.

[0002]

2. Description of the Related Art Japanese Patent Publication No. Sho 50-6998 discloses a food package in which a conductive food is sealed in a bag shape with a package made of an electrically insulating film, and the package is sandwiched between a pair of electrodes. Applying a voltage between the two electrodes so as to make the capacitance formed between the two electrodes small enough to be negligible compared to the capacitance formed between the other electrode and the food, When there is a pinhole in the package between one electrode and the food, a flash is generated between the one electrode and the food through the pinhole, and the current generated by the flash is detected to detect the pinhole. A method has been disclosed for making known.

[0003]

However, in the above-mentioned conventional method, a large voltage of several kilovolts must be applied, which is dangerous and, when there is a pinhole in the package, flashes through the pinhole. Therefore, there is a problem that the packaging is broken and the contents are scattered.
Also, recent food packages are often laminated with aluminum foil and have no electrical insulation, so that the above method cannot be applied.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a leak inspection apparatus for a sealed package that can detect a sealing failure safely and reliably even in a package in which aluminum foil is laminated.

[0005]

In order to solve the above-mentioned problems, a first aspect of the present invention is an apparatus for detecting leakage of a sealed package in which contents including a liquid or the like are enclosed. An extruding unit that intermittently pressurizes the hermetically sealed package to extrude the liquid or the like from a poorly sealed portion of the hermetically sealed package, and short-circuits at least two conductors by the liquid or the like extruded by the extruding unit. Te, saw including a leak detection means for detecting leakage of its contents, the leakage test
The output means is a detection row in which a thin conductive wire is spirally wound into two strips.
A leak inspection device for hermetically sealed packages characterized by containing
is there.

According to a second aspect of the present invention, the contents including a liquid or the like are
Leakage of sealed package to detect leakage of enclosed package
In the inspection device, the sealed package is intermittently pressurized.
And press the liquid or the like from the poorly sealed portion of the sealed package.
Extruding means for extruding and before being extruded by said extruding means
By short-circuiting at least two conductors with a liquid or the like,
Leak detection means for detecting leakage of the contents.
The leak detecting means is composed of a number of conductive layers stacked with an insulating layer interposed therebetween.
The conductive ring includes a detection roller that is electrically connected alternately.
A leakage inspection device for a hermetically sealed package body.

[0007] The third aspect of the present invention is the first or second aspect.
The leak inspection apparatus for a hermetically sealed package according to claim 1, wherein
The detection means is a pair of left and right detection rows each having an inner tip that is substantially hemispherical.
And the outer periphery of the cylindrical portion is sealed at both ends of the hermetically sealed package.
And the substantially hemispherical part is the end of the filling part
Of a sealed package characterized by being along the inclination of
It is a leak inspection device.

[0008]

According to the present invention, the liquid or the like in the sealed package is extruded in advance by the pushing means, and if there is a leak of the liquid or the like, the conductor of the leak detecting means is short-circuited and it is determined that there is a sealing failure. it can.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below with reference to the drawings and the like.
This will be described in more detail. 1 to 5 are diagrams showing an embodiment of a leak inspection device for a sealed package according to the present invention,
1 is a schematic side view, FIG. 2 is a side view showing a drive system, FIG. 3 is a view taken along the line III-III in FIG. 2, FIG. 4 is a circuit block diagram, and FIG. In the leak inspection apparatus of this embodiment, the right half of FIG. 1 is a portion for detecting a leak on the upper surface of the sealed package P, and the left half is a portion for detecting a leak on the lower surface of the sealed package P.

[0010] The feeding roller groups 11a and 11b are
A group of rollers for transporting the sealed package P while rubbing the roll. The rollers are arranged to face each other at an interval slightly smaller than the normal thickness of the sealed package P, and each roller is also arranged at a predetermined distance. A detection roller 13a and a holding roller 14a are attached to rollers on the center side of the rubbing-out conveyance roller groups 11a and 11b via swing arms 12a and 12b. The detection roller 13a and the pressing roller 14a are urged toward each other by springs 15a and 15b.

[0011] The left side of the roller group 11c, 11
d, swing arms 12c and 12d, and detection roller 13
b, the pressing roller 14b and the springs 15c and 15d
It has the same structure except that it is arranged in a point-symmetric relationship with the right side.

The kneading-out transport roller groups 11b and 11c are
Roller group 1 that is rotatably provided on machine frame 1
1a and 11d are provided on the machine frame 2 so as to be freely rotatable.
The machine frames 1 and 2 are arranged according to the thickness of the sealed package P to be inspected.
As shown in FIG. 2, the distance can be adjusted by the screw 3.

When there is a leak in the sealed package P, the wiping device 21 rubs out the conveying rollers 11a to 11d.
, Detection rollers 13a and 13b, and pressing roller 14
This is a device for wiping a, 14b, etc., and includes a sheet portion 21a and a drive portion 21b. The wiping device 21 is provided as a pair outside the upper roller group and the lower roller group. The wiping device 21 may be provided with a drying unit such as a dryer if necessary.

The sorting device 22 is a device for discharging the sealed package P from the transport line when it is determined that the sealed package P has leaked.
a and a drive section 22b.

As shown in FIG. 2, the roller driving device 30 includes a driving motor 31, a total of eight pulleys 32a to 32h, one of which is provided on the output shaft of the motor 31, and a plurality of pulleys 32a to 32h. With the belt 33 wrapped around,
The gear trains 34a to 34d meshed with each other across the shafts of the kneading / conveying roller groups 11a to 11d and an idle gear that changes their rotation directions in the same direction, and the detection rollers 13a,
13b, the pressing rollers 14a, 14b,
It is composed of belts 35a to 35d for transmitting rotation of 33d.

The detection rollers 13a and 13b are formed by spirally winding two electrode wires 41 and 42 alternately and continuously on an insulating roller. In this embodiment, an electrode wire having a diameter of about 0.1 mm is wound about 50 m. This detection roller 13
A slip ring 16 is provided on each of a and 13b for electrical connection of the rotating electrode wires 41 and 42 (see FIG. 3).

Since the electrode wires 41 and 42 are tightly wound (in this embodiment, at intervals of 0.1 mm), the sealed package P
If liquid leaked due to poor sealing of
Even if the liquid or the like is a small spot, a short circuit occurs. Further, since the electrode wires 41 and 42 are spirally wound, FIG.
As shown in the figure, the adhered liquid or the like has a predetermined distance (for example,
Since it is dragged, small leaks can be reliably detected. Therefore, the detection roller 13
It is preferable that the peripheral speeds of a and 13b be slightly higher than the peripheral speed of the rubbing-out conveyance roller groups 11a to 11d so that the surface of the sealed package P is rubbed.

The detection circuit 40 of the leak inspection apparatus is shown in FIG.
As shown in the figure, the 2 wound around the detection rollers 13a and 13b
The electrode lines 41 and 42, an oscillation circuit 43 for applying a voltage to the electrode lines 41 and 42, a differential amplifier circuit 44 for differentially amplifying the voltage output from the electrode lines 41 and 42, and a differential amplifier circuit An AC / DC conversion circuit 45 that converts the AC voltage differentially amplified by 44 into a DC voltage, and a DC voltage converted by the AC / DC conversion circuit 45 to compare and determine whether or not there is leakage. And a circuit 46. Since the detection circuit 40 only applies a low voltage of about AC2.5V, the safety is high, and even if a package having an aluminum layer has a resin coat layer on the surface, The surface of the sealed package P is kept insulative.

Since the leak inspection apparatus is constructed as described above, the sealed package P is rubbed in a wave form when it is transported between the transporting roller groups 11a and 11b, and the pinhole is pierced. , Etc., the liquid or the like is squeezed out of the contents. At this time, even if the dried liquid is clogged in the pinhole, or even if a pair of upper and lower rollers block the pinhole by sandwiching the solid matter in the content, the pinhole is pressed moderately. Can be.

When the liquid or the like is squeezed out on the upper surface of the sealed package P, it adheres to the detection roller 13a, and when it is squeezed out on the lower surface, it adheres to the detection roller 13b. Since the electrode wires 41 and 42 are tightly wound around the detection rollers 13a and 13b, when liquid or the like adheres, at least two adjacent electrode wires 41 and 42 are short-circuited and the detection circuit 4
With 0, a leak can be detected. When the detection circuit 40 detects the leak, the sorting device 22 rejects the sealed package P, and the wiping device 21 approaches to wipe the leaked liquid or the like.

FIG. 6 is a view showing a second embodiment of the leak inspection apparatus for a hermetically sealed package according to the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and
A duplicate description will be omitted. The leak inspection apparatus according to the second embodiment is designed to reliably detect a poor sealing of the seal portions P1 on both sides of the sealed package P in the transport direction.

In the detection rollers 13c and 13d, as in the first embodiment, electrode wires 41 and 42 are wound around insulating rollers. The detection rollers 13c and 13d are coaxially arranged such that the ends are inside the width of the sealed package P, and the ends adapt to the thickness without damaging the sealed package P. As shown, it has a substantially hemispherical shape. Press roller 1
4c and 14d have substantially the same shape as the detection rollers 13c and 13d, except that the electrode wires 41 and 42 are not wound.

The pair of detecting rollers 13c and 13d and pressing rollers 14c and 14d are
11b, the structure of the second embodiment may be used alone or in combination with the structure of the first embodiment. Although only the structure for detecting the upper side of the sealed package P is shown in FIG. 6, the lower side is also detected by a structure having a detection roller on the lower side and a pressing roller on the upper side.

FIG. 7 is a view showing a third embodiment of the leak inspection apparatus for a sealed package according to the present invention. In the third embodiment, the detection roller 50 has durability and can be manufactured easily and inexpensively. The detection roller 50 has two grooves 52a and 52b parallel to the axial direction formed on the surface of an insulating core pipe 52, and electrodes 53 and 54 are provided in the grooves 52a and 52b. . The electrode ring 51 is made by stamping a conductive metal plate, and has a contact projection 51a on the inner periphery.

In the grooves 52a and 52b of the core pipe 52,
The contact protrusions 51a of the electrode ring 51 are inserted alternately,
Every other electrode is connected to the electrodes 53 and 54. An insulating layer 55 also serving as an adhesive is disposed between the electrode rings 51. In FIG. 7A, the electrode rings 51 inserted alternately are shown.
Are denoted by 51A and 51B, and schematically show connections with the electrodes 53 and 54. The thickness of the electrode ring 51 and the adhesive layer 55 is about 0.2 to 0.3 mm, and the thickness is exaggerated in FIG.

The present invention is not limited to the embodiments described above, and various modifications and changes are possible, which are also included in the present invention. For example, when the sealed package P is continuous in the transport direction, the detection roller 13 is placed at the position of the pressing roller 14a.
The inspection may be performed on both sides at a time by arranging b. In addition, the leak detecting means is not limited to a roller, and may be a detecting plate as long as it includes a structure for short-circuiting two conductors. It may be arranged.

The extruding means is not limited to the rubbing-out conveying roller group, but may be a belt or the like as long as it can apply a predetermined pressure continuously at a predetermined interval and can convey. If continuity or transport is not required, a pressing plate having a smooth projection on the surface may be used.

[0028]

As described above in detail, according to the present invention, if a liquid or the like in a sealed package is extruded in advance, and if there is a leakage of the liquid or the like, the conductor may be short-circuited and the sealing may be defective. Since the judgment can be made, the leak can be surely inspected with a simple structure.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a leak inspection apparatus for a sealed package according to the present invention.
It is a side view which shows the Example of a model typically.

FIG. 2 is a side view showing the drive system of the first embodiment.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is a circuit block diagram of the first embodiment.

FIG. 5 is an operation explanatory diagram of the first embodiment.

FIG. 6 shows a second embodiment of the leak inspection apparatus for hermetically sealed packages according to the present invention.
It is a figure which shows the Example of.

FIG. 7 shows a third embodiment of the leak inspection apparatus for hermetically sealed packages according to the present invention.
It is a figure which shows the Example of.

[Explanation of symbols]

 11a to 11d Rolling-out conveyance roller group 13a, 13b Detection roller 14a, 14b Pressing roller 21 Wiping device 22 Sorting device 40 Detection circuit 41, 42 Electrode line 43 Oscillation circuit 44 Differential amplification circuit 45 AC / DC conversion circuit 46 Comparison / decision circuit Reference Signs List 30 roller driving device 31 motor 32a-32h pulley 33 belt 34a-34d gear train 35a-35d belt

Claims (3)

(57) [Claims] An apparatus for detecting leakage of a hermetically sealed package in which contents including a liquid or the like are sealed, wherein the hermetically sealed package is intermittently pressurized to seal the hermetically sealed package. and pushing means for pushing the liquid or the like from the defective portion, by the liquid or the like extruded by said extrusion means, by short-circuiting at least two conductors, seen including a leak detection means for detecting leakage of its contents, the The leak detection means consists of a thin conductor wound spirally in two
A leakage inspection device for a hermetically sealed package , comprising a detection roller . 2. A sealed package in which contents containing a liquid or the like are enclosed.
In a sealed package leak inspection device that detects leakage of packaging
Then, the sealed package is pressurized intermittently, and the sealed package is
Extrusion means for extruding the liquid or the like from a poorly sealed portion and the liquid or the like extruded by the extrusion means,
Short-circuit at least two conductors to prevent leakage of their contents
Leak detecting means for detecting, the leak detecting means, a large number of stacked laminated insulating layer
A detection roller with electrically conductive rings alternately connected
A leak inspection device for a hermetically sealed package, comprising: 3. A sealed package according to claim 1 or 2.
In the body leak inspection apparatus, the leak detection means includes a pair of left and right inner hemispherical tips.
Including a detection roller, the outer periphery of the cylindrical portion is
Holds the seal allowance at both ends, and the substantially hemispherical part is the filling part
A leak inspection device for a hermetically sealed package, wherein the device is adapted to follow the inclination of the end of the minute .