JPH04204028A - Detecting apparatus for slow leak of bag filled with liquid - Google Patents

Abstract

PURPOSE:To inspect the presence or absence of a slow leak with high accuracy by rotating a rotary tub at a predetermined rotating speed for a required time so that the centrifugal force acts to a bag filled with a liquid which is placed inside the rotary tub, and detecting the leaking liquid by sight preferably by a sensor. CONSTITUTION:A rotary tub 1 is detachably coupled to a motor 2 of the variable speed in the axially vertical direction. More preferably, the tub 1 is formed of material not absorbing odor and an upper part thereof is opened. At least the tub 1 is enclosed by a housing 3. At least one of a humidity sensor 5 and an odor sensor 6 is mounted to an openable lid 4 at the ceiling of the housing 3. While a plurality of bags 7 filled with a liquid are accommodated in the rotary tub 1, the rotary tub 1 is rotated for a predetermined time at a predetermined rotating speed. Thereafter, the bags 7 are taken out from the tub 1. The presence or absence of the leaking liquid is detected by sight or, desirably by means of a sensor. Accordingly, the inspection of the presence/absence of the slow leak can be performed easily in a short time with high accuracy.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention detects leakage of liquid from a bag filled with liquid containing viscous substances such as soy sauce, soup, and mustard paste in an extremely short period of time. The present invention relates to a slow leak detection device that can detect slow leaks easily.

[Prior Art] Slow leakage, which is the extremely slow leakage of liquid filled into a packaging bag caused by poor sealing or pinholes in the packaging bag made by heat sealing or other methods, is known as slow leakage. It is the most troublesome quality control item in liquid packaging because it is difficult to detect, and furthermore, slow leaks can render the product itself with the liquid filling bag worthless. , is the most important quality control item.

For this reason, conventionally, all packaging bags that have been filled with liquid are stored in a warehouse or other location for 2 to 3 days, and then all are visually inspected by workers to check for slow leaks. It was common to ship only liquid-filled bags.

[Problem to be solved by the invention]

However, with such conventional technology, it is necessary to secure inventory space and delivery time margin for storing liquid-filled bags, that is, packaging bags filled with liquid, for 2 to 3 days, and also, Since inspection is performed by visual inspection, there are problems in that the number of man-hours increases significantly and the inspection accuracy is low.

This invention advantageously solves the problems of the prior art, and makes it possible to almost eliminate the need for inventory space and lead time for liquid filling bags, and to quickly and easily achieve high accuracy with fewer man-hours. The present invention provides a slow leak detection device for liquid-filled bags that can inspect the presence or absence of slow leaks.

[Means for Solving the Problems] The slow leak detection device for liquid-filled bags of the present invention includes a rotary tank accommodating a plurality of liquid-filled bags connected to a rotary drive means, preferably in a detachable manner. be.

More preferably, at least one of a humidity sensor and an odor sensor is disposed in the rotating tank,
Preferably, the rotating tank is of an open top type, and
At least the rotary tank is housed in a housing, and at least one of a humidity sensor and an odor sensor is attached to a ceiling opening/closing lid provided on the housing.

[For production]

In this slow leak detection device, for example, dozens or hundreds of liquid-filled bags are housed in a rotating tank, either as they are or wrapped in an outer bag, and the rotating tank is
By rotating the rotary drive means, which may be a variable speed motor, for 30 seconds at a rotational speed of, for example, 11000 rpm, the filling liquid into packaging bags having packaging defects such as seal failures, pinholes, etc. is removed. No matter how minute the defect is, it can be leaked in an extremely short time and reliably.

In other words, the liquid in each liquid filling bag is subjected to a centrifugal force proportional to the square of the rotational angular velocity due to the rotation of the rotating tank. During rotation of the rotary tank, the liquid leaks out of the bag through the defective part. This leaked liquid first adheres to the inner peripheral surface of the rotating tank or outer bag under the action of centrifugal force, and then, depending on the amount of liquid leaked and the liquid viscosity, It flows down to the bottom or remains in the adhered state.

Therefore, after the rotating tank is stopped, the liquid-filled bag is taken out from the rotating tank and placed on the inner peripheral surface or bottom of the rotating tank, or
By visually observing whether there is any leaked liquid on the inner circumferential surface or bottom of the outer bag, it is possible to detect the presence or absence of slow leaks in the liquid-filled bags stored simultaneously in the rotating tank in an extremely short time. It can be detected on time and accurately.

By the way, in this type of detection, if the inside of the rotating tank is contaminated by leaked liquid, it is necessary to keep the inside of the tank sufficiently clean to eliminate the influence on subsequent detection. Preferably, the rotary tank is easily and detachably connected to the drive means, thereby allowing easy and complete cleaning etc. in the removed state of the rotary tank, and in conjunction with other pre-cleaned Enables interchangeable use of rotating tanks.

If the liquid-filled bag is placed directly in the rotating tank for detection without being wrapped in an outer bag, at least one of the humidity sensor and the odor sensor should be installed in a position that does not interfere with the rotation of the rotating tank. By detecting the output signals from these sensors, it is possible to detect the presence or absence of a slow leak more accurately than by visual inspection. This is especially noticeable when

In addition, it is preferable that these sensors be attached to the ceiling lid of the housing that surrounds the mold tank with an open top, and that they enter the rotating tank when the lid is closed. The sensor does not impede the loading and unloading of the liquid-filled bag into and out of the rotating tank, and the attachment and detachment of the rotating tank.

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, the liquid-filled bags in the - group may be visually inspected in the conventional manner, or each half of the liquid-filled bags in the - group, and then each half of the bags may be subjected to slow leak detection using the inventive device. By doing this sequentially, you can find slow leaks or multiple liquid-filled bags.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a longitudinal sectional view of a route showing an embodiment of the present invention. Here, a rotating tank 1 having an approximately cup shape as a whole is shown.
is removably connected to a variable speed motor 2 as an example of rotational drive means, with its axis oriented vertically, for example, via a spline shaft.

Although not shown here, in order to prevent the rotating tank 1 from swinging relative to the motor 2 and to ensure that the initial centrifugal force is applied to the contents stored in the rotating tank, a known method is used. A swing prevention mechanism may also be provided.

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

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

In the device configured in this way, the sensors 5 and 6
As mentioned above, slow leak detection without using
After a plurality of liquid-filled bags 7 are housed in the rotating tank either directly or wrapped in an outer bag, the rotating tank l is rotated by the motor 2 at a predetermined rotational speed for a predetermined period of time, and then all The liquid-filled bag 7 is removed from the rotating tank 1, and the presence or absence of leaked liquid adhering to the inner peripheral surface of the rotating tank 1 or the outer bag, or the leakage liquid to the bottom of the rotating tank 1 or the outer bag is determined. This can be done by observing the presence or absence of accumulation.

By the way, - liquid filling bags 7 are fixed at the center position of the bottom wall of the rotating tank 1 where the centrifugal force received is the smallest, and the pinhole diameter provided in the liquid filling bags 7 and the rotation speed of the rotating tank 1 are set as parameters. The presence or absence of a pool of leaked liquid at the bottom of the rotating tank was visually observed, and the results were 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 amount of soy sauce filled into the - packaging bag was 5 cc.

In addition, in the apparatus shown in the embodiment, when at least one of the sensors 5 and 6 is used, a plurality of liquid filling bags 7 are used.
is accommodated in a rotating tank without being wrapped in an outer bag, and a predetermined rotational movement of the rotating tank 1 is brought about.

In this case, when the filling liquid leaks, the humidity inside the tank detected by the humidity sensor increases, and
- Since the detection output of the odor sensor 6 increases, the presence of a slow leak can be detected extremely accurately.

Note that when only one of these sensors 5 and 6 is installed, the humidity sensor 5 is mainly used for liquids with low viscosity, and the humidity sensor 5 is used for liquids with high viscosity and strong odor. It is preferable to arrange an odor sensor 6 for the odor sensor.

By the way, I filled it with 5cc of soy sauce and it weighed about 80! One liquid filling bag 7 with a pinhole of diameter Jm is placed in the rotating tank 1.
Each sensor 5, 6 is fixed at the center of the bottom wall of
The change in detection output over time is as shown in the graph of FIG. 2, and it is observed that when the filling is soy sauce, both sensors 5 and 6 show a high response to the leakage of soy sauce.

Furthermore, in the apparatus of the embodiment, since the rotating tank l is detachable, the rotating tank 1 can be easily attached or removed.
can be cleaned simply and quickly, and while the - rotating tank 1 is being cleaned, slow leaks can also be detected using another rotating tank 1 that has been cleaned in advance.

In addition, here, the sensors 5 and 6 are attached to the ceiling opening/closing lid 4, and when the ceiling opening/closing lid 4 is released, the sensors 5, 6 are sufficiently moved backward, so that the sensors 5, 6 are attached to the ceiling opening/closing lid 4. 6 can completely eliminate the possibility that the storage and removal of the liquid-filled bag 7 and the attachment and detachment of the rotating tank 1 will be hindered.

[Effects of the Invention] Thus, according to the present invention, by rotating the rotating tank at a required rotational speed for a required period of time and applying centrifugal force to the liquid-filled bags stored therein, fine packaging defects can be eliminated. Filled liquid can be leaked quickly and reliably even from packaging bags that are nothing more than packaging bags, so the leaked liquid can be
By detecting by a target, more preferably by a sensor, it is possible to test for the presence or absence of slow leaks easily and with high precision in an extremely short time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a route showing an embodiment of the present invention, and FIG. 2V 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/closing lid, 5...? W degree sensor, 6...Odor sensor, 7...Liquid filling bag Patent applicant Taisei Lamic Co., Ltd.

Claims (1)

[Scope of Claims] 1. A slow leak detection device for a liquid-filled bag, comprising a rotating tank for accommodating a plurality of liquid-filled bags, and rotation driving means for the rotating tank. 2. The detection device according to claim 1, wherein at least one of a humidity sensor and an odor sensor is disposed within the rotating tank. 3. The detection device according to claim 1 or 2, wherein the rotation tank is detachably attached to the rotation driving means. 4. Claim 2, wherein the rotary tank is of an open-top type, 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 on the housing. Or the detection device described in 3.