JP2001031024A - High frequency magnetic field intensity measuring device for sealing of container cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high frequency magnetic field intensity measuring device which serves to make a sealing intensity constant for sealing of a cap. SOLUTION: For a high frequency induction heating device which generates an induced current by operation of an electromagnetic induction by applying a high frequency magnetic field to a cap from a position above a container and melts an adhesive agent by a heating work of the cap, a detection coil 10 for measuring the induced current is provided at the top of a container-like case C formed in a configuration similar to the container while a rectifying circuit which converts current data detected by the detection coil 10 into voltage data is provided, and furthermore a memory circuit for storing the maximum value of the voltage data obtained by the rectifying circuit and a display circuit for displaying the maximum value of the above-mentioned voltage are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency magnetic field intensity measuring device used for a cap sealing device of a container for a lactic acid bacterium drink or the like utilizing heat generated by electromagnetic induction current (eddy current) in the container.

[0002]

2. Description of the Related Art Various containers (paper, paper, etc.)
Currently, it is widely used to fill polystyrene or the like and seal (adhere) it with an aluminum cap to produce a product. As shown in FIG. 2, the cap sealing method includes a container 2 (FIG.
(A)), an adhesive 4 which is melted by heating to give an adhesive ability is covered with an aluminum cap 3 previously applied to the surface to be bonded to the container 2 (FIG. 2 (b)), and then a metal cylinder is placed from above. Pressing means 5 from below while applying a high-frequency magnetic field by
By pressing upward (FIG. 2 (c)), an eddy current is generated in the aluminum cap 3 by the electromagnetic induction action, and the temperature of the aluminum cap 3 is raised by the heat generation action of the eddy current and the specific resistance of the aluminum cap 3. Then, the adhesive 4 is melted and sealed (FIG. 2D). In particular, in a product line manufactured at a high speed, a continuous cap sealing device including a plurality of seal heads having the metal cylindrical body 6 and the pressing means 5 is used.

[0003]

Although such a cap sealing method is an excellent method, there is a case where the magnetic field intensity differs for each head among the same apparatus or a plurality of apparatuses. The difference in the magnetic field strength causes a difference in the heat generating action in accordance with the difference in the eddy current, and as a result, causes a difference in the adhesive strength, which causes a variation in the seal strength between products. It is important to obtain a certain quality (same seal strength) for the same kind of product manufactured continuously, and to obtain a standard index of magnetic field strength setting (a related index between magnetic field strength and heat generation temperature) It was desired.
Also, when manufacturing a wide variety of products on the same line, it may be necessary to appropriately adjust the sealing conditions required for each product, and a standard magnetic field is used for such adjustment. It has been desired to obtain a similar index of intensity setting. However, a means for measuring the strength of the magnetic field actually generated for each individual head has not been proposed until now.

Therefore, the present invention proposes to solve the above-mentioned problem. In a beverage container cap sealing device, an eddy current is generated by electromagnetic induction while applying a high-frequency magnetic field from above, and an adhesive is generated by a heat generation effect. It is an object of the present invention to provide a high-frequency magnetic field strength measuring device for making the sealing strength of a cap seal constant by melting the sealing material.

[0005]

According to a first aspect of the present invention, there is provided a high-frequency magnetic field strength measuring apparatus for sealing a cap of a container, wherein a high-frequency magnetic field is applied to the cap from above the container by electromagnetic induction. In a cap sealing device in which an induced current is generated in a cap and an adhesive is melted by a heating action of the cap, a detection unit is provided at the top of a container-like case that is similar to the outer shape of the container, and seal strength is set by the detection unit. The data for the measurement is measured.

According to a second aspect of the present invention, in the above-mentioned means, a detecting coil for measuring an induced current is provided as a detecting section, and the current data detected by the detecting coil is converted into a voltage. A rectifier circuit for converting data is provided.

According to a third aspect of the present invention, there is provided a high frequency magnetic field intensity measuring device for sealing a cap of a container according to the second aspect, wherein a storage circuit for storing a maximum value of voltage data obtained by the rectifier circuit and a maximum value of the voltage. By providing a display circuit for displaying a value, various information such as an appropriate magnetic field strength for a cap seal and an induction heating temperature is provided, and data is obtained to realize a uniform seal strength. .

[0008]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment is applied to a cap sealing step in which a lactic acid bacteria beverage is filled in a plastic container such as polystyrene, covered with an aluminum cap, and then sealed (adhered) to produce a product.

As shown in FIG. 2, the cap sealing device which is the premise of this embodiment melts by heating the outer peripheral portion of one side of the aluminum cap 3, that is, the bonding surface portion with the polystyrene container 2. An adhesive 4 having an adhesive ability is applied in advance, the contents are filled, and the aluminum cap 3 is covered, and then the aluminum cap 3 is pressed while applying a high-frequency magnetic field to the aluminum cap 3 from above, thereby providing electromagnetic induction. An eddy current is generated in the aluminum cap 3 by the action, and the temperature of the aluminum cap 3 is raised by the heat generation action of the eddy current and the specific resistance of the aluminum cap 3 to melt and bond the adhesive 4. . Then, a cap sealing device provided with a plurality of seal heads having the metal cylindrical body 6 and the pressing means 5 is used.

[0010] The high-frequency magnetic field strength measuring apparatus according to the present invention comprises:
This is applied to the cap sealing device. The external shape of the high-frequency magnetic field strength measuring apparatus of the embodiment is housed in a container-like case C having substantially the same shape as a polystyrene container filled with a lactic acid bacterium beverage to be cap-sealed. The detecting unit 10 is provided in the opening 24 at the top of the container-like case C, and the detecting unit 10 measures data for setting the seal strength. From the data from the detection unit 10, there is an effect that various information such as a proper magnetic field strength and a heating temperature for the cap seal can be obtained.

Further, a detecting coil 10 for measuring an induced current is provided as a detecting section, and a means 11 for converting the induced current (AC) detected by the detecting coil 10 into a DC is provided, so that the measured value Handling can be facilitated. Further, storage means 1 for storing the voltage data
By providing 2, the data is held and used as data for adjusting the magnetic field intensity. Further, a conversion circuit for converting the current detected by the detection coil 10 to DC by the rectifier circuit 11, a storage circuit for converting DC data obtained by the conversion circuit into voltage data, and storing a maximum value of the voltage data 12, and a display circuit 13 for displaying the maximum value of the voltage, so that voltage data can be read.

Next, each component will be described. The container-like case C is formed so as to approximate the outer shape of the container for performing the cap seal. The reason why the shape of the container-like case C is approximated to the outer shape of the container in the present invention is to enable conveyance on the same line as the container, and the range of the approximation is not limited as long as this object is achieved.

The container-like case C is entirely made of an electric insulator such as ceramic or synthetic resin. The lower part 20 is made of an aluminum alloy at the lower part, and the main part is made of an electric insulator made of ceramic or synthetic resin at the upper part. The internal cavity with the upper portion 21 may be formed integrally. A fitted edge portion 22 is formed on the upper edge portion of the main body bottom portion 20. A fitting edge 23 is formed at the lower edge of the upper part 21 of the main body, and the opening 2 is formed at the upper edge.
4 are formed. Then, the main body bottom portion 20 and the main body upper portion 21
Means that the container-like case C is formed by fitting the fitted edge portion 22 and the fitting edge portion 23. Then, components of the measuring device are arranged in the container-like case C. The measurement value output terminals T1, T
2, charging terminals T1, T3, reset terminals T4, T5, and
Power switches T6 and T7 are provided.

As members constituting the measuring device, a detection coil 10 constituting a detecting section, a board A constituting a DC power supply circuit, a board B constituting a rectifier circuit and the like, and a peak hold chip constituting a peak hold circuit D and the like are arranged in the container-like case C. The detection coil 10 for generating an induced current is arranged at a position along the periphery of the opening 24 of the container C. Detection coil 1 used in this case
0 is desirably one turn. The coil diameter may be appropriately selected according to the size of the container, but a copper wire having an outer diameter of about 0.2 to 2.0 mm or the like which can be arranged in a small space may be appropriately selected.

Therefore, the metal cylindrical body 6 forming the magnetic core
An induced current will be generated in the detection coil 10 in accordance with the strength of the magnetic field supplied for the cap seal from. Then, the induced current generated in the detection coil 10 is supplied to the rectifier circuit. The eddy current (AC) is supplied to the rectifier circuit 11
Is rectified to AC. As the rectifier circuit 11 used in this case, a commercially available full-wave rectifier circuit may be selected. Then, the DC current obtained by this circuit is converted into a voltage and supplied to a storage circuit 12 described later. A power supply circuit 16 of ± 15 V is supplied from a battery 14 via a switch circuit 15 to a storage circuit 12 described later. As the battery 14 used in this case, a method of serially using a plurality of nickel cadmium batteries that can be arranged in a small space may be appropriately selected.

The maximum voltage among the voltages supplied from the rectifier circuit 11 is stored in the storage circuit 12 using a peak hold circuit. The maximum voltage data stored in the storage circuit 12 is subjected to A / D conversion after the measurement is completed, and
Are supplied via the measurement value output terminals T1 and T2 and are digitally displayed.

In summary, the container-like case C, which constitutes the strength measuring device, is moved to the detection coil 10 when passing through the metal cylinder 6 while being transferred by the bottle base 1. , An induced current (AC) flows. The current is converted into DC by the waveform rectifier circuit 11, and the current is converted into a voltage by a resistor (fixed) (V =
IR), the maximum voltage is recorded in the measured value storage circuit 12, and this value is displayed on the measured value display circuit 13.

It is important that the outer shape of the above-mentioned apparatus be shaped in accordance with the shape of the transport line of the product container so that at least the same high-frequency magnetic field as that of the product is applied to a portion corresponding to the seal portion. Further, instead of the storage circuit 12 of the above embodiment,
Transmitting means for transmitting information to be stored in real time may be provided, and the magnetic field intensity may be adjusted manually or automatically based on the transmitted information.

[0019]

According to the present invention, the following effects can be obtained by the above configuration. 1. According to the first aspect of the present invention, there is provided a cap sealing device for generating an eddy current in the cap by electromagnetic induction while applying a high-frequency magnetic field to the cap from above the container, and melting the adhesive by the heat generation of the cap. ,
A detector is provided at the top of the container-like case that is similar to the outer shape of the container, and the detector measures data for setting the seal strength, so that the proper magnetic field strength for the cap seal, the heating temperature, etc. This is effective in obtaining the basic information of

2. According to the second aspect of the present invention, in addition to the above-described effects, the detection unit includes a detection coil for measuring an induced current, and includes a rectifier circuit that converts current data detected by the detection coil into voltage data. By doing so, the handling of the measured values can be facilitated.

3. According to the third aspect of the present invention, in addition to the effect of the second aspect, a storage circuit for storing the maximum value of the voltage data obtained by the rectifier circuit and a display circuit for displaying the maximum value of the voltage are provided. By doing so, it is possible to retain data and use it as data for adjusting magnetic strength,
Further, voltage data can be read.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of an embodiment according to the present invention.

FIG. 2 is an explanatory diagram for explaining the operation of the embodiment according to the present invention.

FIG. 3 is a vertical sectional view of the embodiment.

FIG. 4 is a system circuit diagram of the embodiment.

[Explanation of symbols]

 A: Substrate B: Substrate C: Container-like case D: Chip for peak hold 1 ... Bottle stand 2 ... (Beverage) container 3 ... (Aluminum) cap 4 ...・ Adhesive material 5 ・ ・ ・ Pressing (means) 6 ・ ・ ・ Metal cylindrical body (magnetic core) 10 ・ ・ Detection unit (detection coil) 11 ・ ・ Rectifier circuit 12 ・ ・ Storage circuit 13 ・ ・ Display circuit 14 ・ ・Battery 15. Switch circuit 16. Power supply circuit 20. Body bottom 21. Body top 22. Fitted edge 23. Fitting edge 24. Opening T1, T2 ... Measurement value output Terminal T1, T3: Charging terminal T4, T5: Reset terminal T6, T7: Power switch

Claims (3)

[Claims] 1. A high-frequency induction heating apparatus for generating an induction current in an electromagnet by an electromagnetic induction action while applying a high-frequency magnetic field to the cap from above a container and melting an adhesive by a heat generation action of the cap. A high-frequency magnetic field strength measuring apparatus for sealing a cap of a container, wherein a detecting unit is provided at the top of a container-like case having an approximate outer shape, and the detecting unit measures data for setting a sealing strength. 2. The detection unit according to claim 1, further comprising a detection coil for measuring an induced current, and a rectifier circuit for converting current data detected by the detection coil into voltage data. High frequency magnetic field strength measuring device for container cap seal. 3. A storage circuit for storing a maximum value of voltage data obtained by the rectifier circuit, and a display circuit for displaying the maximum value of the voltage.
A high-frequency magnetic field strength measuring device for cap sealing of a container according to the above.