JP2951717B2 - Slow leak detector for liquid-filled bags - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to soy sauce, soup, kneaded mustard and other
The present invention relates to a slow leak detection device that can easily detect the presence or absence of leakage of a liquid containing a viscous substance from a bag filled with the liquid in a very short time.

[Conventional technology]

It is difficult to find a very slow leakage of the filling liquid into the packaging bag due to poor sealing of the packaging bag made by heat sealing or the like, pinholes generated in the packaging bag, so-called slow leak. Therefore, it is the most troublesome quality control item in liquid packaging,
Moreover, the occurrence of the slow leak renders the product body attached with the liquid-filled bag worthless.
This is the most important quality control item.

For this reason, conventionally, after storing all of the packaging bags filled with the liquid in a warehouse or the like for 2 to 3 days, the presence or absence of a slow leak is inspected by a visual inspection by an operator, and no slow leak occurs. It was common to ship only liquid-filled bags.

[Problems to be solved by the invention]

However, in such prior art, a liquid-filled bag,
That is, it is necessary to secure an inventory space and a delivery deadline for stocking the packaging bags filled with the liquid for 2 to 3 days, and since the inspection is performed visually by the operator, the number of working steps is significantly increased. Another problem is that the inspection accuracy is low.

The present invention advantageously solves the above-mentioned problems of the prior art, and makes the inventory space and delivery time of the liquid-filled bag almost unnecessary, and is quick, easy, and highly accurate with a small number of man-hours. It is an object of the present invention to provide a slow leak detection device for a liquid-filled bag, which can inspect for the presence or absence of a slow leak by using the method.

[Means for solving the problem]

The slow leak detection device for a liquid-filled bag according to the present invention comprises:
A rotary tank accommodating a plurality of liquid-filled bags is connected to a rotation driving means, preferably in a detachable manner.

Here, more preferably, at least one of a humidity sensor and an odor sensor is provided in the rotating tank, and preferably, the rotating tank is open-ended and at least the rotating tank is housed in the housing. Then, at least one of a humidity sensor and an odor sensor is attached to a ceiling opening / closing lid provided in the housing.

(Operation)

In this slow leak detection device, for example, dozens or hundreds of liquid-filled bags are housed in a rotary tank as it is or wrapped in an outer bag, and the rotary tank is a variable-speed motor. By means of a rotating drive means, for example, by rotating at a rotation speed of 1000 rpm for 30 seconds, the filling liquid into a packaging bag having packaging defects such as poor sealing, pinholes, etc. Even in this case, it is possible to leak out in a very short time and reliably.

That is, the liquid in each liquid filling bag receives a centrifugal force having a magnitude proportional to the square of the rotational angular velocity due to the rotation of the rotary tank, so that even if there is an extremely minute packaging defect in the packaging bag, the filling is performed. The liquid leaks out of the bag through the defective part during rotation of the rotary tank. Then, the leaked liquid first adheres to the inner peripheral surface of the rotating tank or the outer bag under the action of the centrifugal force, and thereafter, in relation to the amount of liquid leaked and the liquid viscosity, the liquid in the rotating tank or the outer bag is removed. Runs down to the bottom or remains as attached.

Therefore, after the rotation tank is stopped, the liquid-filled bag is taken out from the rotation tank, and whether or not the leaked liquid exists on the inner peripheral surface or bottom of the rotary tank or on the inner peripheral surface or bottom of the outer bag. By visually observing, it is possible to detect in a very short time and accurately whether or not there is a slow leak in which a group of liquid-filled bags simultaneously accommodated in the rotary tank is detected.

By the way, in such detection, when the inside of the rotating tank is contaminated with the leaked liquid, it is necessary to clean the inside of the tank sufficiently to remove the influence on the subsequent detection. Preferably, the rotatable tub is easily connected to and detached from the driving means, so that the rotatable tub can be easily and completely washed under the detached condition, and at the same time, other pre-cleaned Enables replacement use of the rotating tank.

In addition, when the liquid-filled bag is directly housed in the rotating tank without being wrapped in the outer bag and the detection is performed, at least one of the humidity sensor and the odor sensor is placed at a position where the rotation of the rotating tank is not hindered. It is preferable to arrange them, and by detecting output signals from those sensors, the presence or absence of slow leak can be detected more accurately than in the case of visual inspection, which means that both sensors can be used together. This is particularly noticeable when doing so.

In addition, it is preferable that these sensors be attached to a ceiling opening / closing lid of a housing surrounding a mold tank having an open upper end, and enter the rotating tank when the opening / closing lid is closed. The storage and removal of the liquid-filled bag into and from the rotating tank and the attachment and detachment of the rotating tank are not hindered by the sensor.

By detecting the presence or absence of a slow leak as described above, if it is found that there is a slow leak, for example, for the group of liquid-filled bags, by performing a visual inspection as before, or For each half of the group of liquid-filled bags, and for each half thereof, slow leak detection is sequentially performed by the invented device, thereby finding one or a plurality of liquid-filled bags having a slow leak.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic vertical sectional view showing an embodiment of the present invention. Here, the rotary tub 1 having a substantially cup shape as a whole is detachably connected to a variable speed motor 2 as an example of a rotary drive means via a spline shaft, for example, with its axis oriented in the vertical direction.

Although not shown here, the motor 2 of the rotating tank 1 is not shown.
A known anti-oscillation mechanism may be provided to prevent the head from oscillating with respect to and to surely apply the initial centrifugal force to the contents in the rotary tank.

Preferably, the rotary tank 1 is made of a material that does not absorb odors, such as glass and Teflon,
When the rotating tub 1 is of an open-top type as shown in the figure, at least the rotating tub 1, in this case, both the rotating tub 1 and the motor 2 are surrounded by a housing 3, and a ceiling opening / closing lid 4 provided in the housing 3 is attached to the housing 3. , At least one of the humidity sensor 5 and the odor sensor 6, more preferably, as shown in FIG.
6 is retracted outside the rotating tank when the ceiling opening / closing lid 4 is opened,
At the time of closing, it is allowed to enter the rotating tank.

Here, a known sensor such as a polymer film humidity sensor or a ceramic humidity sensor can be used as the humidity sensor 5, and the odor sensor 6 can be, for example, a heat transfer by gas adsorption on a metal oxide surface. A hot wire type semiconductor gas sensor that measures the change in temperature and the change in electrical conductivity as the change in resistance at both ends of a platinum wire coil can be used.

In the device configured as described above, the sensors 5, 6
Slow leak detection that does not use, as described above,
After the plurality of liquid-filled bags 7 are directly or wrapped in an outer bag and housed in a rotary tank, the rotary tank 1 is rotated at a predetermined rotational speed by a motor 2 for a predetermined time, and The liquid filled bag 7 is taken out of the rotating tank 1 and the presence or absence of leaked liquid attached to the inner peripheral surface of the rotating tank 1 or the outer bag, or the liquid of the leaked liquid to the bottom of the rotating tank 1 or the outer bag. This can be done by observing the presence or absence of pools.

Incidentally, one liquid filling bag 7 is fixed to the center position of the bottom wall of the rotary tank 1 which receives the smallest centrifugal force, and the pinhole diameter provided in the liquid filling bag 7 and the rotation speed of the rotary tank 1 are used as parameters. The presence or absence of a liquid pool of the leaked liquid at the bottom of the rotary tank was visually observed, and the result was as shown in the following table.

Here, the rotation time of the rotary tank 1 was 30 seconds, the filling liquid was soy sauce, and the filling amount of soy sauce in one packaging bag was 5 cc.

When at least one of the sensors 5 and 6 is used in the apparatus shown in the embodiment, a plurality of liquid filling bags 7 are used.
Is stored in the rotating tank without being wrapped in the outer bag, and a predetermined rotating motion of the rotating tank 1 is brought about.

In this case, when the filling liquid leaks, the humidity in the tank detected by the humidity sensor increases, and the detection output by the odor sensor 6 increases, so that the presence of a slow leak can be detected very accurately. can do.

Here, when only one of these sensors 5 and 6 is provided, the humidity sensor 5 is mainly used for a liquid having a low viscosity, and the humidity sensor 5 is mainly used for a liquid having a high viscosity and a strong odor. On the other hand, it is preferable to provide the odor sensor 6.

By the way, one liquid filling bag 7 filled with 5 cc of soy sauce oil and having a pinhole with a diameter of about 80 μm was fixed to the center of the bottom wall of the rotary tank 1, and the rotary tank 1 was rotated at a rotation speed of 800 rpm. The change over time in the detection output of each of the sensors 5 and 6 is as shown in the graph of FIG. 2. When the filling is soy sauce, any of the sensors 5, 6 It is also observed that the reaction is high.

Further, in the apparatus according to the embodiment, since the rotary tub 1 is detachable, the rotary tub 1 can be easily and quickly cleaned in a detached state. During the cleaning, the slow leak can be detected by using another rotary tank 1 that has been cleaned in advance.

Further, here, the sensors 5 and 6 are attached to the ceiling opening / closing lid 4, and are attached to the ceiling opening / closing lid 4, and when the ceiling opening / closing lid 4 is released, the sensors 5 and 6 are sufficiently displaced to displace the sensors 5 and 6. , 6 can completely prevent the liquid filling bag 7 from being housed and taken out, and the rotation tank 1 from being attached and detached.

〔The invention's effect〕

Thus, according to the present invention, the rotating tub is rotated at a required rotational speed for a required time, and a centrifugal force is applied to the liquid-filled bag accommodated therein, whereby a packaging bag having only a minute packaging defect is provided. Therefore, the filling liquid can be quickly and reliably leaked, so that the leaked liquid can be visually and more preferably detected by a sensor, so that the inspection for the presence or absence of a slow leak can be performed in an extremely short time. It can be performed easily and with high accuracy in time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic vertical sectional view showing an embodiment of the present invention, and FIG. 2 is a graph showing an example of detection of leaked liquid by a humidity sensor and an odor sensor. 1 ... rotating tank, 2 ... variable speed motor, 3 ... housing, 4 ... ceiling opening and closing lid, 5 ... humidity sensor, 6 ... odor sensor, 7 ... liquid filling bag

Claims (4)

(57) [Claims] A rotating tank containing a plurality of liquid-filled bags;
A slow leak detecting device for a liquid-filled bag, comprising: a rotary driving means for the rotary tank. 2. The detecting device according to claim 1, wherein at least one of a humidity sensor and an odor sensor is provided in said rotary tank. 3. The detecting device according to claim 1, wherein a rotary tank is detachably attached to said rotary driving means. 4. The method according to claim 1, wherein the rotating tank is of an open top type.
3. The apparatus according to claim 2, wherein at least the mold tank is housed in a housing, and at least one of the humidity sensor and the odor sensor is attached to a ceiling opening / closing lid provided in the housing.
Or the detection device according to 3.