JP2008239190A - Packaging method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging method for speedily and accurately bagging a powder body especially with a high bulk specific gravity by a compact packaging machine. <P>SOLUTION: The packaging method includes the repeated steps of: intermittently moving a rotary table 4 with many grip pairs g to each of a plurality of processes; shaking a packaging bag a to reduce the bulk of a powder body in the bag by a shaking means after the powder body is filled at a rough filling process using a rotary type packaging machine for filling a predetermined amount of the powder body into the packaging bag a supported by each grip pair; weighing a content amount at a weighing process; filling to compensate the deficit of the powder body relative to a regular content amount based on the weighed date by a weighing means at a compensation/filling process; calculating once every several times the compensation amount relative to a rough filling amount based on the weighing date by the weighing means for feeding back the compensation value corresponding to the compensation amount; and using for rough filling the weight changed by the compensation from the next time. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a packaging method in which powders such as wheat flour or granules such as seeds and baits are automatically packed at a high speed by a rotary packaging machine.

  Japanese Examined Patent Publication No. 6-29043 discloses a gloss weighing and packaging method using a rotary type packaging machine. The packaging method is provided with two rotary tables, a filling table and a sealing table that rotate intermittently at the same speed, in a plane, and is put out into the packaging bag while being gripped by a gripper on one filling table, After stamping, hold the packaging bag with the quantitative detector and dispense with the gripper's gripping action, then hold the packaging bag again with the gripper and stamp it, then use the sealing claw on the other sealing table After grasping the upper edge of the opening of the packaging bag, the gripper on the filling table side is opened, the packaging bag is transferred from the filling table side to the sealing table side, and then the opening edge of the packaging bag is heat-sealed and discharged outside the machine. Has been.

Although it is not clear what the packaging material is in the above packaging method, if the packaging material is powder, especially flour, press the flour that has been put out into the packaging bag with a stamp from above. If this is the case, there is a disadvantage that the flour rises to the surroundings instead of becoming bulky.
In addition, since the dispensing is performed until the regular internal volume is reached while measuring with the quantitative detector, the filling time at the dispensing is increased, and it is considered difficult to speed up the packaging. In addition, the packaging capacity in this kind of rotary packaging machine is about 20 bags per minute.

  Since the packaging machine for carrying out the packaging method has a configuration in which two rotary tables, ie, a filling table and a sealing table (equal distribution) corresponding to eight processes, are provided in a plane, the packaging machine Was larger in plane. In addition, since the packaging bag is transferred from the filling table to the sealing table, the packaging bag delivered to the sealing table is gripped in an inclined state, and the height of the packaging bag is likely to vary. It was also a cause of seal failure.

As for a filling device for filling powder or granules into a packaging container or bag, the powder or particles are removed from the outlet of the cylindrical tube by rotating a screw arranged in the cylindrical tube by driving an electric motor device. An auger device provided for delivery is used. For example, in Japanese Patent Application Laid-Open No. 11-348903, a screw is placed in a cylindrical filter that is depressurized or evacuated, the air contained in the powder supplied from the hopper is degassed, and the powder is then discharged. A structure for delivering from is disclosed.
Japanese Patent Publication No. 6-29043 JP 11-348903 A

  An object of the present invention is to provide a packaging method in which powders or granules, particularly powders having a large bulk specific gravity, can be packaged at high speed and with a compact packaging machine.

In order to achieve the above object, according to the first aspect of the present invention, a rotary table provided with a large number of grip pairs in the radial direction is intermittently moved for each of a plurality of steps, and the bag mouth is raised by each grip pair. Using a rotary packaging machine configured to fill the packaging bag supported in a suspended form with a predetermined amount of packaged items, seal the bag mouth, and then discharge the packaging bag,
In the rough filling step, the powder or granules to be packaged are roughly filled by the first filling means, and then the packaging bag is vibrated by the vibration means, thereby reducing the bulk of the powder or granules in the packaging bag and measuring. In the process, the measuring means measures the inner volume in a state in which the bag mouth portion of the packaging bag is clamped by the weighing means and the gripping action by the grip pair is released, and then in the correction filling process, based on the measurement data by the weighing means After correcting and filling the powder or granule that is insufficient with respect to the normal internal volume by the second filling means, and applying vibration to the packaging bag that has been subjected to the correction and filling, the powder or granule is made smaller. The bag mouth is sealed to release the packaging bag outside the machine, and the correction amount for the rough filling amount is calculated based on the measurement data every several times by the measuring means to correspond to the correction amount. The correction value is controlled by the first filling means. Feedback, and is characterized in that to perform repeat applying at full measure changed by correcting the coarse filling from next time.

  In order to achieve the same object, according to a second aspect of the present invention, in the packaging method according to the first aspect, the first filling means and the second filling means are arranged in the casing by driving a servo motor. An auger device provided to feed powder or granules from the outlet of the casing into the packaging bag by rotating a screw, and has an auger device having a deaeration function at least for the first filling means It is a feature.

  In order to achieve the same object, the invention described in claim 3 is the packaging method according to claim 1 or 2, wherein the weight of the product packed in the bag is measured by an auto checker installed at the subsequent stage of the packaging machine. Then, a correction amount for the correction filling amount is calculated based on the measurement data obtained every several times by the auto checker, and a correction value corresponding to the correction amount is fed back to the control unit of the second filling means. It is characterized in that the correction filling is repeatedly performed for the amount changed by the correction.

(Invention of Claim 1)
This packaging method uses a rotary packaging machine equipped with one rotary table, feeds back a correction value for the coarse filling amount to the control unit of the first filling means, and changes the coarse filling from the next time by the correction. Since it is configured to be applied by eye, powder or granules, particularly powder having a large bulk specific gravity, can be accurately filled at high speed (about 30 to 50 bags per minute). In addition, since the packaging machine is compact, installation space is small.

(Invention of Claim 2)
In this packaging method, by adopting an auger device configured to feed powder or granules into a packaging bag by rotating a screw by a servo motor, it is possible to perform packaging with high quality with little variation in content. .

(Invention of Claim 3)
In this packaging method, a correction value for the correction filling amount is fed back to the control unit of the second filling means by an auto checker installed at the subsequent stage of the packaging machine, and the next correction filling is performed with the amount changed by the correction. Therefore, the filling operation can be performed with high accuracy.

  The best mode of the present invention will be described below with reference to the drawings. 1 is a front view of a rotary type packaging machine to which the method of the present invention is applied, FIG. 2 is a plan view of the same, FIG. 3 is a side view of the same, and FIG. 4 is an explanatory view showing a flow of packaging work by the method of the present invention. 5 is a timing chart of the filling operation according to the method of the present invention.

  A rotary type packaging machine 1 to which the packaging method of the present invention is applied is shown in FIGS. This packaging machine 1 is provided on a post 3 erected on a machine base 2 with a rotatable table 4 in which 16 grip pairs g are arranged at equal angular intervals in the radial direction. Are provided so as to be intermittently movable every 16 steps. In the packaging method of this embodiment, “flour” is targeted as a powder or granules, and a stand bag (self-supporting bag) a supported in a suspended form by a grip pair g is roughly filled (about 580 grams). Packing filling is performed by applying correction filling (about 20 grams) to a normal capacity (600 grams).

  The main process of the packaging machine 1 includes a bag supply process (1) for supplying the stand bags a to the grip pairs g one by one by the bag supply device 30, and a bag bottom opening process (4) for opening the bottom portion of the stand bags. An opening step (5) for opening the bag mouth of the stand bag, a coarse filling step (6) for coarsely filling the flour with the auger device 35 having a deaeration function as the first filling means, and a vibration at the bottom of the stand bag The bottom vibration steps (7) to (9) for reducing the volume of the flour inside, the weighing step (10) for measuring the content of the coarsely filled flour by the weighing means 40, and the deaeration function as the second filling means Correction filling step (11) for performing correction filling by the auger device 50, the step (12) for blowing off the flour adhering to the inner surface of the bag mouth with air and vibrating the bottom (12), and the air venting step for eliminating the air remaining in the stand bag (13), Over the top sealing step (14) for applying the heat-sealing of the bag mouth by Le device 55, the cooling sealing step (15) for performing cooling of the heat sealed portion, it is outside the system discharge step of releasing the product to the outside of the apparatus (16).

  The auger device has a known structure in which a screw contained in a casing is rotated by a servo motor to feed powder or granules into the packaging bag.

Next, the flow of the packaging work in the packaging method of the present invention will be described based on the drawing of FIG.
(1) In the coarse filling step (6), after about 580 g of flour is roughly filled by the auger device 35, in the bottom vibration steps (7) to (9), the stand bag a is removed by vibration means (not shown). Vibrate to sink the flour in the packaging bag and reduce the volume.
(2) In the weighing step (10), the inner volume is measured in a state in which the bag mouth b portion of the stand bag a is clamped by the clamp of the weighing means 40 and the clamping action by the grip pair g is released. Next, the stand bag a is again supported by the grip pair g.
(3) In the correction filling step (11), the auger device 50 corrects and fills about 20 g of flour that is insufficient relative to the normal content based on the measurement data obtained by the weighing means 40. (4) In the blow-off / bottom vibration step (12), the flour adhering to the inner surface of the bag mouth is blown off with air and the packaging bag is vibrated to reduce the bulk of the flour.
(5) In the top sealing step (14), the bag mouth is sealed by the sealing device 55.
(6) After cooling the heat seal portion in the cooling seal step (15), the product a ′ is discharged outside the apparatus in the system discharge step (16).

  As shown in the timing chart of FIG. 5, the correction amount for the rough filling amount is calculated by the control unit 60 of the packaging machine based on the measurement data every several times by the weighing means 40, and the correction value corresponding to the correction amount. The number of tendency pulses is fed back to the control unit of the auger device 35 to control the rotation speed of the servo motor, and the rough filling from the next time is repeatedly applied to the amount changed by the correction. The The correction filling is performed by feeding back the number of correction filling pulses, which is a correction value, to the control unit of the auger device 50 based on the measurement data of each time by the measuring means 40 and controlling the rotation speed of the servo motor.

Further, if the auto checker 70 is installed at the subsequent stage of the packaging machine 1, it is possible to perform packaging filling with higher accuracy (corresponding to the invention of claim 3).
In this case, the weight of the product a ′ packed by the auto-checker 70 is measured, and the correction amount for the correction filling amount is calculated based on the measurement data every several times by the auto-checker 70 to correspond to the correction amount. The number of tendency pulses is fed back to the control unit of the auger device 50 to control the rotation speed of the servo motor, and the subsequent correction filling is performed repeatedly to the amount changed by the correction. .

  In the packaging method according to this embodiment, 30 to 50 bags can be packed per minute, and the filling accuracy with respect to a regular internal capacity of 600 grams is 1 gram or less on average.

  As described above, this packaging method uses a rotary packaging machine equipped with one rotary table, feeds back a correction value for the coarse filling amount to the control unit of the auger device, and corrects the coarse filling from the next time by correction. Since it is applied according to the changed amount, there is an advantage that powder such as flour having a large bulk specific gravity can be packaged at high speed and with high accuracy.

Front view of a rotary packaging machine to which the method of the present invention is applied Same as above, top view Same side view Explanatory drawing which shows the flow of the packaging work by this invention method Timing chart of filling operation according to the method of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rotary type packaging machine 4 ... Rotary table g ... Grip pair a ... Stand bag (packaging bag)
b ... bag mouth 35 ... auger device (first filling means)
40 ... Measuring means 50 ... Auger device (second filling means)
70 ... Auto checker

Claims (3)

A rotating table provided with a large number of grip pairs in the radial direction is intermittently moved in each of a plurality of steps, and a predetermined amount of an object to be packaged is supported on a packaging bag supported by each grip pair in a suspended manner with the bag mouth facing up Using a rotary packaging machine configured to fill and seal the bag mouth and then discharge the packaging bag,
In the rough filling step, the powder or granules to be packaged are roughly filled by the first filling means, and then the packaging bag is vibrated by the vibration means, thereby reducing the bulk of the powder or granules in the packaging bag and measuring. In the process, the measuring means measures the inner volume in a state in which the bag mouth portion of the packaging bag is clamped by the weighing means and the gripping action by the grip pair is released, and then in the correction filling process, based on the measurement data by the weighing means After correcting and filling the powder or granule that is insufficient with respect to the normal internal volume by the second filling means, and applying vibration to the packaging bag that has been subjected to the correction and filling, the powder or granule is made smaller. The bag mouth is sealed to release the packaging bag outside the machine, and the correction amount for the rough filling amount is calculated based on the measurement data every several times by the measuring means to correspond to the correction amount. The correction value is controlled by the first filling means. Feedback and packaging method is characterized in that to perform repeat applying at full measure changed by correcting the coarse filling from next time.   The first filling means and the second filling means are provided so as to feed powder or granules from the outlet of the casing into the packaging bag by rotating a screw arranged in the casing by driving a servo motor. The packaging method according to claim 1, wherein the auger device is an auger device having a deaeration function for at least the first filling means.   The weight of the product packed in the bag by the auto checker installed at the subsequent stage of the packaging machine is measured, and the correction amount for the correction filling amount is calculated based on the measurement data every several times by the auto checker. The correction value corresponding to is fed back to the control unit of the second filling means, and the next correction filling is repeatedly applied to the corrected amount. Packaging method as described in 1.

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