JPS60186753A - Inspecting device for packing container - Google Patents

Abstract

PURPOSE:To inspect a sealing defective part automatically with high accuracy by arranging an ultrasonic wave transmitter and a receiver opposite so that the focus is set at the welded seal of a packing container, and providing a means which supplies water between the transmitter and receiver, and seal part. CONSTITUTION:Ultrasonic wave vibrators 32 and 33 are arranged opposite after charging so that the focus is set at the seal part 5, and jets 34 and 35 for ultrasonic wave propagation are spoutted out of nozzles 32 and 33 surrounding those vibrators 32 and 33. While the seal part 5 is moved as shown by an arrow, the vibrator 32 for transmission is excited and its ultrasonic wave is received by the vibrator 33 for reception. Its output is processed by a signal processing circuit 38 to decides whether the seal part 5 is normal or not with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a packaging container inspection device for inspecting a welded seal portion of a packaging container.

As shown in FIG. 1, a retort pouch food 1 is a food that is filled in a packaging container 3 formed into a bag shape by a pre-fill sealing part 2 that seals the peripheral edges of a pair of sheet-like packaging materials a and a on three sides. After that, the opening of the packaging container 3 is sealed by heat welding (post-filling sealing part 5).

However, with the current packaging technology, poor sealing of the seal portion 5 after filling often occurs due to stains on the sealing surface due to liquid splashing during food filling, water droplets adhering to the filling, and the like. This seal failure poses a serious problem because the contents of the package are foods, so they may rot, or the contents may leak out from the seal failure, causing staining of the surrounding area.

By the way, the part 5 sealed after light filling has a fine mesh-like uneven pattern created by the cloth tape used to improve sealing performance and prevent fusion with the sealing mechanism, or as shown in Figure 2. Automated visual inspection technology has difficulty detecting defects such as dents caused by poor adhesion or bulges caused by filling material due to irregular undulations, which hinders the automation of the inspection process. ing. Therefore, currently, inspectors conduct visual inspections under these adverse conditions. However, this method requires a lot of manpower and expense, and may result in defective products being mixed in due to oversights due to fatigue of the inspectors.
The drawback is that trust is also lacking because a so-called wasted spring occurs when a good product is mistaken for a defective product due to a mistake.

The present invention was made in view of the above-mentioned problems, and is an inspection device for the bath coat seal portion of a packaging container, which is installed opposite to each other with the bath coat seal portion of the packaging container sandwiched between them. I-i
:! Consisting of a total wave transmitter and a receiver, and a stage for supplying water between the transmitter and receiver and the sealing part,
We found that the amount of attenuation of ultrasonic waves is significantly different between the healthy part and the defective part of the seal. and the sealing part of the packaging container,
It is an object of the present invention to provide a packaging container inspection device which focuses an ultrasonic beam on a part to be inspected without attenuation for flaw detection, thereby detecting a defective part of a seal with high precision, and which also enables self-tXJJ inspection. shall be.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Figure 3 is a schematic diagram showing the configuration of this device.
is an ultrasonic flaw detector. Further, 32 is a beam-focused ultrasonic transducer for transmission connected to this ultrasonic flaw detector 31;
3 is a beam focusing type ultrasonic transducer connected to the ultrasonic flaw detector 3, and these ultrasonic transducers 32 and 334 are arranged facing each other with a focal length approximately twice the focal length of beam 11, and the intermediate position is It is configured so that the sealed portion 5, which is the object to be inspected, passes through after filling. In addition, these ultrasound imagers 3.2, 3.
A water jet 34 for propagating super-continuous waves is directed toward the object to be inspected from the force 1.
,．． Each ultrasonic vibrator 32.3 to eject 95
Nozzles 36' and 37 are provided surrounding the nozzle 3. m
1. The ultrasonic probe 3 excites the transmitting ultrasonic transducer 32, receives the received output of the receiver 1A ultrasonic transducer 32 that receives the excited ultrasonic waves, amplifies it, and performs signal processing. It has a function to provide to the circuit 38. Therefore, the post-filling seal part 5, which is the object to be inspected, is moved in the direction of the arrow at an intermediate position between the pair of ultrasonic sensors 92 and 33 disposed opposite each other, almost at the focal point of the ultrasonic beam UB. By doing so, it is possible to perform ultrasonic flaw detection on the first part of the test object with a focus position with high resolution, and to provide the ultrasonic reception output from this flaw detection to the signal processing circuit 38. Therefore, the ultrasonic reception By converting the output to a level HJQ by the signal processing circuit 38, it is possible to judge whether the seal is good or bad.

Next, the operation of the present apparatus having the configuration described in "-1" will be explained.

In Fig. 3, after filling, when the seal part 5 is moved in the direction of the arrow of the Be A focused super juice fiber mover 32 which is oscillating ultrasonic waves, the water The jet 34, after filling, propagates through the seal portion 5 and the water jet 35, and is transmitted to the receiving vibrator 3.
The ultrasonic wave reaching 3 indicates whether the seal of the sealing part 5 is good or not after filling.
The strength of the hole varies greatly depending on the size, etc. 'In other words, the ultrasonic propagation of water is extremely good, and since the water and the object to be inspected are tightly poured, there is little ultrasonic attenuation, and a good seal is formed at the part of the object to be inspected. t) Since the adhesive is dense in the wavy portion, the ultrasonic attenuation here is also small. Therefore, the intensity of the received ultrasonic waves increases. Due to the presence of air bubbles due to insufficient adhesion in areas with poor sealing, the ultrasonic waves are scattered and attenuated depending on the size and degree of the air bubbles, and the ultrasonic intensity is reduced. Therefore, by comparing and determining the level of the received ultrasonic waves using, for example, one alternating threshold value in the signal processing circuit 38, it is possible to determine the quality of the seal portion.

Fig. 4 shows the relationship between the type and size of seal failure in the sealed portion 5 after filling and the output voltage of the ultrasonic flaw detector 31. A plan view of the sealed portion 5 after filling is shown in FIG. 4, and a cross section thereof is schematically shown in FIG.

In addition, Fig. 4 (cl) shows the received ultrasonic wave intensity at each position.As can be seen from the figure, the (m output' pressure) at the normal seal part fluctuates by about 10%.On the other hand, For defect 41.42 of 1 to 2 words φ in the defective seal part, it decreased by about 90%,
A similar decrease in the appropriate signal output pressure is also observed in the defect 43 in which the filler is trapped. Through this first experiment, we were able to experimentally confirm the effectiveness of this method.

Similarly, according to the present invention, the ultrasonic transducer 32,
．． Since there is water between the 93 and the object to be inspected, the ultrasonic beam propagates without being affected by the mesh-like unevenness caused by cloth tape, etc. Therefore, the defective seal part due to the original poor adhesion can be directly detected by ultrasonic waves. can be inspected.

Therefore, with this device, defects can be detected without being affected by the external shape of the object to be inspected (undulations, mesh-like uneven patterns, etc.), and by using a beam focusing type ultrasonic transducer, The transmitted ultrasonic waves can be effectively applied to the inspection target area, and detection sensitivity can be improved. Therefore, if this device is used, it becomes possible to perform an in-line, highly reliable automatic inspection in place of the conventional visual inspection, and it becomes possible to automate the quality inspection of the seal portion and save labor.

It should be noted that the present invention is not limited to the embodiments described above and shown in drawing ζ, and can be implemented with appropriate modifications within the scope of the gist thereof. For example, in the above embodiments, a water jet type is used. However, it is also possible to use an underwater immersion type in which four pairs of ultrasonic transducers are placed underwater and the inspection is performed underwater. In addition, the size of the focal point of the ultrasonic beam is set to correspond to the width of the sealing part 5 after filling, but if multiple stages of inspection devices are arranged in series, the focal size can be made smaller and one bite can be achieved with a small width. , it is also possible to perform defect inspection. In this case, inspection can be performed with higher resolution. Furthermore, even if there are air bubbles, if there is no communication between the inside and outside of the container and the internal seal is maintained, a part of the position of the seal part 5 may be inspected after filling with a small focus ultrasonic beam. .

As described in detail above, the present invention is an inspection device for a welded seal portion of a packaging container, which is provided facing the welded seal portion of the packaging container, and is positioned so that its focal point substantially coincides with the welded seal portion. It consists of an ultrasonic transmitter and a receiver, and a means for supplying water between the transmitter and receiver and the seal, and the amount of attenuation of the ultrasonic waves is significantly different between the healthy part and the defective part of the seal. Focusing on this point, we used ultrasonic waves to detect defects, and in order to propagate the ultrasonic waves well, we installed water between the ultrasonic transmitter, receiver, and packaging container seal. This system improves the propagation of ultrasonic waves and prevents the harmful effects of ultrasonic propagation due to the surface shape of large objects to be inspected, making it possible to detect defective seals on objects with high precision, and with less force than 1. It is possible to provide a packaging container inspection device having features such as automatic inspection.

[Brief explanation of the drawing]

Fig. 11(a), (bl is a plan view showing the structure of the packaging container and its cross section indicated by the arrow A-A, Fig. 2 is a diagram for explaining an example of the detection output of the seal portion by the seal rear brightening device. 1... Packaging container, 5... Sealing part after filling, 31...
・Ultrasonic beam 1.92.33...Ultrasonic transducer, 3
4゜35...Water jet, 36.37...Nozzle,
38...I-number processing circuit. Applicant's Sub-Agent 7PJtlI Takehiko Kojie
lll Figure 2 Figure 3 jI4 Figure

Claims (1)

[Claims] As an inspection device for the welded seal portion of a packaging container, there are provided an ultrasonic transmitter arranged to face the welded seal portion of the packaging container with the welded seal portion ζ in between; A packaging container inspection device characterized in that a receiver, and means for supplying water between the transmitter, the receiver, and the sealing portion cost 11 yen.