JPH1095410A - Defective seal detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a packaged body in which adhesion of a sealed part is insufficient among sealed packaged bodies in which the powder and granular body is filled at high speed and with excellent accuracy by pressing the packaged body by a pressurizing means, and detecting at this moment the powder and granular body to be discharged from the packaged body and sucked by a duct by a sensor. SOLUTION: When a filled bag A is carried by a conveyor 12 of a detection part 6 and reaches immediately below a press roller 30, the bag A is fed below the roller 30 against the gravity of the press roller 30 and the force of a spring 36, and held and carried by the press roller 30 and a round belt 20 of the conveyor 12 in the pressed condition. If adhesion of a sealed part of the bag A is insufficient, and the powder in the bag A is leaked from a defectively adhered part, the powder is fed to suction ports 42a, 42b of a lower duct 42 with the compressed air injected from an air curtain 40, and sucked into the duct 42 by the suction pressure of a sucking means 48. The powder is detected quantitatively by a detection sensor 44 to judge whether or not the seal is defective.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defective seal detecting device for detecting a package having insufficient sealing at a sealed portion from a package packed and sealed with a granular material.

[0002]

2. Description of the Related Art Granules such as flour are packed in packaging bags by a predetermined amount in a vertical filling and packaging apparatus and shipped to the market as products. Such a packaging bag is formed by heat-sealing the side and bottom surfaces (not shown) of the packaging bag as shown in FIG. After the body is packed, the mouth of the packaging bag is heat-sealed (heat-sealed). This heat sealing is performed by melting and coating the coating material such as polyethylene on the inner surface of the packaging bag by heating. FIG. 6 is a schematic perspective view of an example of such a packaging bag, and FIG. 7 is a schematic diagram showing a state in which a bottom surface (end seal) or a top opening (top seal) of the packaging bag is crimped from below or above. Is shown. As shown in FIG. 6, the mouth and bottom of the packaging bag are:
In the state where both ends are folded inward, heat-pressing is performed from both sides with a heat seal bar at a predetermined temperature (for example, 150 to 180 ° C.) and a predetermined pressure (for example, 100 kg / cm ² ).

[0003] However, according to such a vertical filling and packaging apparatus, it is possible to insert a fold (gusset) for forming a standing pouch required for a flour bag or the like. Since heat sealing is performed directly below, the powder that has spilled from the tip of the auger filler due to vibrations etc. at the moment of heat sealing enters the upper and lower heat-sealed parts, that is, the top seal part and the end seal part, and adheres sufficiently. It may not be possible to form a seal failure part,
During handling such as transportation, transportation, packing, etc., the powder filled in the bag may leak out from this defective sealing part or moisture may enter, which may cause problems in product handling and quality stability. there were. Also, as can be seen from FIG.
In the seal portion, a quadruple portion and a double portion occur, and a step occurs at a boundary portion between the double portion and the quadruple portion. Therefore, when sufficient bonding is not performed at the step portion It is possible that powder leakage does not necessarily occur. In particular, when the granular material to be packaged is a food such as flour, the presence of such a poorly-sealed portion may not only prevent the general consumer from being able to provide a certain amount and quality of the product to general consumers. In addition, it may increase concerns about the hygiene of the product, which may impair the reliability of the product and, consequently, the reliability of the manufacturer.

In order to solve such problems, there are known a sealing degree detecting device using a vacuum chamber, a device for detecting deformation of a packaging bag by applying a pressure to a displacement sensor, and the like. However, they are insufficient in terms of reliability, reliability, processing speed, and downsizing of the apparatus. In addition, as an attachment to the packaging machine, there is also known a powder entrapment detection device for a seal portion (a type for checking the thickness of the seal portion, a type for detecting sandwiched powder with light in the seal portion, and the like). However, the accuracy was insufficient.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and detects a package with insufficient adhesion of a sealed portion from a package which is filled and sealed with a granular material. Device with high detection accuracy, high processing speed,
An object of the present invention is to provide a seal failure detection device capable of reducing the size of the device.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an apparatus for detecting a package having insufficient sealing at a sealed portion from a package filled and sealed with a granular material. A conveyor that conveys the package, a pressurizing unit that is provided above the conveyor and presses the conveyed package downward, and a conveying direction upstream of the pressurizing unit below the conveyor. A duct provided on the side and / or the downstream side, a suction unit communicating with the duct and sucking the granular material, provided in the duct, and discharged from the package by the pressurization of the pressurization unit And a sensor for detecting the granular material sucked into the duct.

Here, the pressing means is preferably a press roller or a press conveyor. Preferably, the pressurizing means is a press roller, the conveyor is a round belt conveyor, and the ducts are provided on the upstream and downstream sides in the conveying direction of the press roller. Further, it is preferable that the sensor is a frictionally charged dust sensor. Further, it is preferable to provide an air curtain above the duct.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a seal failure detecting device according to the present invention will be described in detail. FIG. 1 is a schematic diagram showing an example in which the seal failure detection device (hereinafter, referred to as a detection device 4) of the present invention is applied to the next process of a vertical filling and packaging device (hereinafter, referred to as a packaging device 2). The packaging device 2 shown in the figure is a device for filling a bag with a granular material such as flour and heat-sealing, and the detection device 4 of the present invention shown in the figure has a sealing portion sufficiently adhered. It has a detection unit 6 for detecting a missing bag (hereinafter referred to as a badly-sealed bag) and a discharge unit 8 for discharging the badly-sealed bag out of the system.

FIGS. 2 and 3 are schematic diagrams of the detecting section 6 of the detecting device 4 of the present invention. FIG. 2 is a schematic diagram illustrating an example of a detection unit in the seal failure detection device of the present invention, and FIG. 3 is a schematic diagram of the detection unit in FIG. 2 as viewed from the downstream side in the transport direction. The detection unit 6 is a characteristic part of the present invention for detecting a badly-sealed bag, and includes a conveyor 12, a press roller 30,
Duct 42, detection sensor 44, suction means 48, air curtain 40, casing 46, detection lamp 50
And Here, a part of the duct 42 and the detection sensor 44 are housed inside the casing 46, and the suction means 48 is separately provided outside the casing 46. In addition,
In the illustrated example, the bag A filled with powder is packed with a press roller 30.
Shows a state where pressure is applied.

[0010] The conveyor 12 is provided adjacent to the upper end side of the inclined conveyor 10, and is provided from the packaging device 2 to the inclined conveyor 1.
The bag A transported by 0 is taken over, horizontally transported, passed below the press roller 30, and further transported to the discharge section 8 which is the next step. In the illustrated example, the conveyor 12 includes two frames 14, 14 that are spaced apart from each other on the top plate of the casing 46 by a predetermined distance and that are mounted and fixed in parallel with each other in the transport direction of the bag A. At both ends in the transport direction of the frames 14, 14, two rollers 18, 18 of which both shaft ends 18 a are rotatably supported by bearings 16, and the frames 14, 1
4 is a belt conveyor composed of nine round belts 20 stretched over these two rollers 18 at equal intervals.

The belt stretched over the rollers 18 is not particularly limited as long as the powder discharged from the bag A can be sucked into the duct 42. Any belt may be used. Belt may be used, but duct 4
In the case where the second suction port is provided below the belt like the suction port 42b in the illustrated example, it is preferable that the belt is basically a divided belt like the round belt 20 in the illustrated example. Various belts can be used as the belt, and a V belt or the like may be used. Further, the number of the round belts 46 is not particularly limited, and may be appropriately determined according to the device design, the belt diameter, the size of the bag A, and the like.

A pulley 22 is provided at one end of one of the two rollers 18.
2 and a motor 24 provided on the outer surface of the casing 46.
The belt 26 is stretched between the pulley 24a and the connected shaft, and the roller functions as a driving roller, and the other functions as a driven roller. The conveyor 12 is not limited to the above-described belt conveyor, but may be any conveyor having the same function as the above-described belt conveyor, for example, a plurality of drive rollers or a plurality of drive rollers. And a roller conveyor in which the driven rollers and the driven rollers are arranged at a predetermined interval. The frame 14 is fixed inside the round belt 20 by a connecting member (not shown) such as a beam. Further, the frame 14 is fixed to four stays 28, one end of which is fixed to a top plate of the casing 46 at a side end, by a fixing tool such as a bolt, a nut, or a screw (not shown) so that the frame 14 has a predetermined interval on the casing 46. It is supported by putting. The fixing of the stay 28 to the top plate of the casing 46 and the frame 14 is not particularly limited, and may be performed by welding, or may be performed by using a nut or the like by cutting the stay 28 with a thread or the like. Method is good.

The press roller 30 presses the bag A (hereinafter, referred to as a bag A) filled with the powder while being conveyed by sandwiching the bag A between the conveyor 12 and the bag A.
Is for discharging the powder in the bag A from the poorly sealed portion of the bag A when the seal is defective. The press roller 30 is provided with a motor (not shown) connected to the shaft 30a inside the press roller, and is configured to rotate itself. Note that the motor may not be provided in the press roller 30 as long as the nipping and conveying of the bag A can be performed smoothly.

Both ends of the shaft 30a of the press roller 30 are vertically movably supported by long holes 34 formed in the stay 32, and are held so as not to rotate. The stay 32 is fixed to a side end of the frame 14. Thus, the press roller 30 is held so as not to be lower than a predetermined height (hereinafter, referred to as a reference height) with respect to the conveyor 12. One end of the stay 32 is fixed to the frame 14 by a fixing tool such as a bolt, a nut or a screw, or by welding.
The other end is a plate-like member having an elongated hole 34 formed so that the press roller 30 can move up and down as the bag A passes.

The reference height is set according to the type and size of the bag A and the type, size and amount of the contents, but the center position of the press roller 30 is higher than the height of the bag A, and
It is preferable that the height is determined so that the press roller 30 can contact the bag A. As described above, when the size of the bag A is changed, the height of the press roller 30 can be adjusted to the reference height corresponding thereto.
An elongated hole may be provided in a portion where the stay 32 is fixed to the frame 14, and the height of the press roller 30 may be adjusted by adjusting the mounting height of the frame 14.
A screw portion or the like is provided in the long hole 34 at the upper part of the
The height of the stay 32 with respect to 0, that is, the supporting position may be adjustable. By holding the press roller 30 at an appropriate height in accordance with the bag A to be detected in this way, the conveyed bag A is infiltrated below the press roller 30 by the press roller 30 and the conveyor 12. It is nipped and conveyed, and is pressed at a constant pressure by the weight of the press roller 30.

Further, it is preferable that springs 36 for applying an urging force to the frame 14 are provided at both ends of the shaft 30a of the press roller 30. In this case,
The force by which the press roller 30 presses the bag A is the combined force of the weight of the press conveyor 30 and the urging force of the spring. Therefore, by adjusting the length of the spring 36, the force for pressing the bag A can be adjusted. In the illustrated example, the spring 36 has one end hooked on the press roller shaft 30a and the other end hooked on a pin 38 provided on the casing 46, so that the press roller 30 and the frame 1
Energize between 4. If a plurality of pins 38 are provided in the height direction as shown in the illustrated example, the biasing force can be adjusted by changing the pins 38 that lock the spring 36.
The method of adjusting the biasing force of the spring 36 is not particularly limited as long as the length of the spring 36 is changed.

The duct 42 contains powder B discharged from the bag A.
Are for forming a flow path from the detection sensor 44 to the suction means 48. Duct 4 in the illustrated example
2, two suction ports 42a and 42b are formed in the lower part on the upstream side and the lower part on the downstream side in the conveying direction of the press roller 30, and a pipe communicating from the two suction ports 42a and 42b is located above the detection sensor 44. The pipes are joined to form one pipe, and this pipe is connected to the suction means 48. However, the pipe may be configured to have two ducts which communicate with the suction ports 42a and 42b separately and independently. Suction ports 42a, 4
2b is formed so as to receive the portion through which the top seal portion and the end seal portion of the bag A pass from below while the bag A passes below the press roller 30, and the other end of the duct 42 is suctioned. It communicates with the means 48. Therefore, the width of the suction ports 42a and 42b in the belt width direction is preferably larger than the width of the bag A. Further, a detection sensor 44 for detecting the concentration of the powder is provided at the merged tubular portion in the duct 42.

It is preferable that air curtains 40, 40 are provided above the conveyor 12 at positions corresponding to the two suction ports 42a, 42b, respectively. The air curtain 40 is provided between the upper and lower ducts 4 of the conveyor 12.
Compressed air is ejected toward the suction ports 42a and 42b of the second belt, and the powder discharged from the bag A by the pressurization of the press roller 30 quickly passes through the gap between the round belts 20, and the suction ports 42a and 42b At the same time, the detection rate of the seal failure can be further improved, and the powder is prevented from scattering outside the apparatus. Since powder leakage from the bag A can occur from the two seal portions of the bag A, that is, the top seal portion and the end seal portion, the suction port and the air curtain 4
0 is preferably provided on both the upstream side and the downstream side in the transport direction of the press roller 30, but may be any one of the upstream side and the downstream side.

The suction means 48 is connected to the bag A via the duct 42.
For sucking powder discharged from the apparatus, and has a blower, an air release hood, and a dust box (none is shown). The blower sucks the powder discharged from the bag breaker A onto the round belt through the duct 42, sends the sucked air to the outside through the air release hood, and sends the sucked powder to the dust box. And various conventionally known suction means such as a fan and an ejector can be used.

The detection sensor 44 is not particularly limited as long as it can detect the concentration or presence or absence of the powder to be sucked.
Various known sensors can be used, for example, color,
Sensors using light and static electricity are exemplified. Among them, a friction charging type dust sensor is preferably exemplified, and specifically, EMP-3 manufactured by Menardi Criswell Japan Co., Ltd. is exemplified. Such a triboelectric type dust sensor measures the flow rate of solid particles in a pipe through a detection rod fixed in the pipe, and the particles generate friction between the particles or the pipe wall, and are proportional to the flow rate. When a small amount of static electricity is generated in the particles, the small amount of static electricity is transferred to a detection rod, amplified by an electronic circuit, and converted into an output signal.

FIG. 4 is a schematic diagram of powder sensing using such a triboelectric type dust sensor 44. In the illustrated example, the triboelectric dust sensor 44 is a detection rod 44 made of stainless steel.
a is inserted perpendicularly to the suction direction in the duct 42, detects the sucked powder B, and generates an output signal proportional to the powder flow rate. The sensor output is variable by adjusting the sensitivity, and may be appropriately set by the user. The detection signal of the powder by the detection sensor 44 is sent to a control unit of the discharge unit 8 described below via an NG output control unit (not shown) to rotate the flipper 70 and In response, the display lamp 50 provided above the conveyor 12 of the detection unit 6 is turned on.

FIG. 5 is a schematic perspective view of the discharge section 8 of the detection device 4 of the present invention. The discharge unit 8 includes a conveyor table 62, a belt conveyor 52, a weighing conveyor 64, a discharge conveyor 68, and a control unit (not shown). Conveyor stand 62
Is for holding the belt conveyor 52, the weighing conveyor 64, and the discharge conveyor 68 at a predetermined height, and has a leg portion 62a and an attachment portion 62b. The belt conveyor 52 takes over the bag A conveyed from the detection unit 6 and conveys it to the weighing conveyor 64. The belt conveyer 52 is provided with two rollers 54 rotatably supported at both ends of a frame 58 via bearings 60. It consists of a conveyor belt 56 that is stretched,
A drive unit is connected to one of the rollers 54. The belt conveyor 52 is provided with a mounting portion 6 of the conveyor base 62.
By fixing at least a part of the frame 58 to 2b, the frame 58 is maintained at a predetermined height.

The weighing conveyor 64 includes the belt conveyor 52.
In addition to the function as a belt conveyor having the same configuration as that described above, there is no particular limitation as long as it has a function of measuring the weight of the filled bag A and outputting the weight value as a signal readable by the control unit. It is a conveyor using various known measuring means such as a load cell. Also, the weighing conveyor 64
May further be provided with a metal foreign matter detection function.

The control unit displays the weighing result of the bag A on the display device 66 based on the weighing signal input from the weighing conveyor 64, and determines whether the reference amount of powder is contained in the bag A. Display on the display device 66 and the detecting unit 6
The presence / absence of powder leakage is displayed on the display device 66 based on the signal indicating the presence / absence of powder input from the sensor 44. The display on the display device 66 is not particularly limited. For example, the measurement result of the weight of the bag A, the detection result of the discharged powder of the bag A, the determination of whether the bag A is the acceptable amount or the unacceptable amount, and the like. Or a lamp display. Also, the control unit
In this way, the measurement result and the detection result are displayed, and as a result, when the powder leaks or at least one of the cases where the weight is less than the reference weight, the flipper 70 on the discharge conveyor 68 is moved to a predetermined position. When the flipper 70 is rotated in the horizontal direction at an angle and none of the above cases is satisfied, a driving means (not shown) provided on the discharge conveyor 68 to hold the flipper 70 at the side end of the belt of the discharge conveyor 68. ).

The discharge conveyor 68 includes the belt conveyor 52
In addition to the function as a belt conveyor having the same configuration as that of the above, a flipper 70 for discharging the bag A with poor sealing out of the system.
It is a conveyor which has. The flipper 70 is a long plate-like member that is rotatably provided at a side end of the belt of the discharge conveyor 68 via a rotation shaft 70a. Is bad in the seal, the bag A is turned around the turning shaft 70a, and the bag A is discharged from the transfer path by discharging the bag A from the transfer path on the discharge conveyor. The flipper 70 is normally set at the side end of the conveyor belt. In response to an instruction from the control unit, the flipper 70 is rotated in a horizontal direction by a predetermined angle by a driving unit (not shown) to move the bag A having the poor seal out of the system. Can be discharged.

Although the seal failure detecting device of the present invention has been specifically described above, the present invention is not limited to the above example, and various improvements and modifications can be made without departing from the gist of the present invention. You may. For example, the duct 42 may have one suction port only on either the upstream side or the downstream side in the transport direction. The press roller 30 may be arranged at a position higher than the height of the bag A, and the press roller 30 itself may press the bag A downward by using another power source, or the press roller 30 may have a predetermined height. It is good also as a structure which is fixed to an end and does not move up and down. Further, the discharge section 8 may not be provided, and in this case, when a bag A having a bad seal is detected, a warning buzzer, a warning lamp, or the like may be used to notify the surroundings.
In addition, the brush for cleaning the round belt is connected to the conveyor 1 of the detection unit 6.
2 may be provided in the vicinity.

In place of the press roller 30, a press conveyor having a conveyor belt stretched through rollers at both ends of two frames connected in parallel by a connecting member such as a beam may be used. In this case, the frame and the connecting member are tapered on both sides in the conveying direction of the press conveyor, that is, the entrance side and the exit side of the bag A, so that the bag A is inserted into the press conveyor and discharged from the press conveyor. Is preferred. In addition, as a method of tapering the conveyor belt, a known method such as tapering the connecting member or attaching another roller to the frame may be used. In order to increase the pressing force of the press conveyor, weights may be provided on both frames.

The seal failure detecting device of the present invention is basically constructed as described above, and its operation will be described below.

First, the bag A is filled with a predetermined amount of powder by the filling and packaging apparatus 2. The bag A is conveyed to a mouth sealing device (not shown), the mouth of the bag is sandwiched by a heat seal bar heated to a predetermined temperature, and heat-sealed.
When a continuous belt-shaped sheet is used, the packaging is completed by cutting the heat seal portion, and the sheet is continuously conveyed to the detection unit 6 which is the next process by the inclined conveyor 10.

When the filled bag A is conveyed to one end of the conveyor 12 of the detecting section 6 by the inclined conveyor 10, the bag A
Is taken over by the conveyor 12 and transported. When one end of the bag A reaches just below the press roller 30, the bag A
It penetrates below the press roller 30 against the gravity of the press roller 30 and the urging force of a spring 36 provided as necessary, and is nipped and conveyed by the press roller 30 and the round belt 20 of the conveyor 12 while being pressed. You. At this time, if the adhesion of the seal portion of the bag A is insufficient, that is, if a part of the seal portion is not adhered or has a weak adhesive force, the pressing force of the press conveyer 30 or the urging force further applied thereto. Due to the resultant force, the powder in the bag A is discharged from the poor adhesion portion.

The powder discharged in the case where the adhesion of the seal portion of the bag A is insufficient is passed between the round belts 20 by the compressed air ejected downward from the air curtain 40, and the lower duct 42 Are quickly sent to the suction ports 42a and 42b, and are sucked into the duct 42 by the suction pressure of the suction means 48. Here, by using the round belt 20,
The discharged powder can be collected in the duct 42 through the suction ports 42 a and 42 b provided below the conveyor 12 and moved to the detection sensor 44. In addition, since the seal failure in the vertical direction of the bag A detected by the action of the press roller 30 is directly inspected at the same time, the leaked powder does not remain on the belt. Furthermore, if compressed air is sent from above the suction ports 42a and 42b of the duct 42, dust does not scatter around the air curtain 40.

The powder passing through the duct 42 is
It is quantitatively detected by a detection sensor 44 provided on the way, and the detection sensor 44 transmits a detection signal depending on the powder concentration to an NG output control unit (not shown) in the discharge unit 8. NG
The output control unit determines, based on this signal, whether or not the bag A has leaked a predetermined amount or more of the amount due to the sealing failure. If it is determined that the bag A has leaked, N
The G discharge signal is transmitted to the discharge unit 8.

The sucked air is sent to an air release hood (not shown) by a blower (not shown) in the suction means 48, and is discharged outside through the air release hood. At this time, a dust box is provided immediately below the air release hood, so that if powder is contained in the sucked air, only the air is discharged to the outside by the air release hood, and the powder is discharged to the lower dust box. Integrated within.
On the other hand, the bag A that has passed between the press roller 30 and the conveyor 12 is conveyed to the discharge section 8, which is the next step.

The bag A thus transported to the discharge section 8 is
It is taken over by the belt conveyor 52 and transported, and reaches the weighing conveyor 64 for weight inspection. The weight of the bag A is measured by the weighing conveyor 64, and the obtained weight value is transmitted to a control unit (not shown). In this control unit, it is determined whether or not the reference amount of powder is filled based on the transmitted weight value. If it is determined that the powder has leaked, an NG signal is transmitted from the detection unit 6. You. On the other hand, these measurement results and detection results are displayed on the display device 66.

As a result, when the amount of the powder in the bag A is less than the reference amount, or when it is determined that the bag A has defective sealing, the display on the display device 66 is made in accordance with an instruction from the control unit. At the same time, the driving means (not shown) in the discharge conveyor 68 is driven to rotate the flipper 70 by a predetermined angle about the rotation shaft 70a, and the bag A is discharged out of the system from the side end of the belt of the discharge conveyor 68. . On the other hand, when these deficiencies are not detected, the flipper 70 does not rotate,
The bags A are kept parallel along the side edges of the discharge conveyor 68, and the bags A are conveyed in the horizontal direction, and the next step, such as packing for shipping, is performed. Therefore, it is possible to ship only the product to which the seal portion is sufficiently adhered. In the illustrated example, the weight check and the exclusion work for checking the weight of the bag are performed together, but it is needless to say that the exclusion may be performed independently.

[0036]

As described above in detail, according to the seal failure detecting device of the present invention, only a bag with a poor seal can be automatically detected from a packaging bag filled and packed with a granular material. . Therefore, it is possible to ship only a package product that is sufficiently sealed. In addition, by actually pressing the bag, the detection rate of a bag with a defective seal is extremely high, and the bag can be directly incorporated into a production line using a conveyor, which is suitable for efficiency. Furthermore, because of the simple configuration of the device, the size of the device can be reduced (for example, the machine length is 500 mm).

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example in which a seal failure detecting device of the present invention is applied to a next process of a filling and packaging device.

FIG. 2 is a schematic diagram illustrating an example of a detection unit in the seal failure detection device of the present invention.

FIG. 3 is a schematic diagram of the detection unit of FIG. 2 as viewed from a downstream side in a transport direction.

FIG. 4 is a schematic diagram showing an example of sensing by a detection sensor in the seal failure detection device of the present invention.

FIG. 5 is a schematic perspective view showing an example of a discharge unit in the seal failure detecting device of the present invention.

FIG. 6 is a schematic perspective view of an example of a packaging bag filled with powder.

FIG. 7 is a schematic view showing a state in which the mouth of a packaging bag filled with powder is pressure-bonded as viewed from above.

[Explanation of symbols]

 2 Filling / packaging device 4 Seal failure detection device 6 Detecting unit 8 Discharge unit 10 Inclined conveyor 12 Conveyor 14 Frame 16 Bearing 18 Roller 18a Roller shaft 20 Round belt 22 Pulley 24 Motor 24a Pulley 26 Belt 28 Stay 30 Press roller 30a Press roller shaft 32 Stay 34 Long hole 36 Spring 38 Pin 40 Air curtain 42 Duct 42a, 42b Suction port 44 Detection sensor 46 Casing 48 Suction means 50 Detection lamp 52 Belt conveyor 62 Conveyor base 64 Metering conveyor 66 Display device 68 Discharge conveyor 70 Flipper 72 Heat seal bar A bag B powder

Claims (5)

[Claims] 1. A device for detecting a package having insufficient sealing at a sealed portion from a package filled and sealed with a granular material, comprising: a conveyor for transporting the package; and an upper part of the conveyor. Pressurizing means for pressurizing the package to be conveyed downward, and a duct provided below and above the conveyor and upstream and / or downstream of the pressurizing means in the conveying direction; and communicating with the duct. And a suction unit for sucking the powder and granules, and a sensor provided in the duct and detecting the powder and granules discharged from the package by the pressurization of the pressurizing unit and sucked into the duct. A seal failure detection device characterized by having: 2. The seal failure detecting device according to claim 1, wherein said pressurizing means is a press roller or a press conveyor. 3. The seal failure detecting device according to claim 1, wherein said pressurizing means is a press roller, said conveyor is a round belt conveyor, and said ducts are provided upstream and downstream in the conveying direction of said press roller. . 4. The seal failure detecting device according to claim 1, wherein said sensor is a triboelectric type dust sensor. 5. The seal failure detecting device according to claim 1, wherein an air curtain is provided above the duct.