JP2013154918A - Method for determining propriety of inner lid heating temperature by high frequency induction heating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make output adjustment work of a high frequency induction heating device simple and convenient in a container lidding line for attaching an inner lid to a mouth part of a container by high frequency induction heating while conveying the container at prescribed line speed.SOLUTION: Thermo-labels 16 of three kinds such as 105°C, 110°C and 115°C are prepared, and stuck to the inner lid 6, and then trial by a high frequency induction heating device 14 is performed at actual line speed. The output adjustment of the high frequency induction heating device 14 is performed until attaining a state where all the labels 16 of 105°C are discolored, all the labels 16 of 110°C are discolored, and the labels 16 of 115°C are not discolored.

Description

  The present invention relates to a method for determining the suitability of inner lid heating by high-frequency induction heating, and more particularly to a method for judging the suitability of inner lid heating temperature by high-frequency induction heating, which can provide convenience for adjustment of a high-frequency induction heating device. .

  As a screw-type or crimp-type lid for containers that mainly contain powder, liquid, and paste, an outer lid and an inner lid interposed between the outer lid and the mouth of the container are provided. A synthetic resin lid is known in which an aluminum sealing material (hereinafter referred to as “aluminum sealing material”) constituting the lid is adhered to the mouth of the container to seal the container. This type of lid is as described in detail in Patent Document 1, and covers the mouth of the container with an aluminum sealing material composed of a laminated material of a heat-meltable resin film and an aluminum foil, and from above By screwing or crimping the outer lid into the mouth of the container and passing through a high-frequency induction heating device, the heat-meltable resin film layer of the aluminum sealing material melts and adheres to the mouth of the container, thereby sealing the container It will be in the state.

  In the food production line, the process of sealing the container with a lid before and after filling the contents is automated, and the lid is applied to the containers that are sent one after another at a predetermined line speed and the inner lid by a high frequency induction heating device. Bonding is performed. Adhesion of the inner lid by this type of high-frequency induction heating device has the advantage that it can be speeded up because it is performed in a non-contact manner, but grasps the suitability of the inner lid seal state, that is, the suitability of the inner lid heating temperature. It has a problem that it is difficult to do.

  The above-mentioned patent document 1 discloses an invention for detecting suitability for adhesion of an inner lid by high frequency induction heating. Specifically, in the invention disclosed in Patent Document 1, the upper surface of the lid is photographed with an infrared thermal image camera with respect to the container exiting the high frequency induction heating device, and the shape of the obtained image or the processing is performed. The suitability of adhesion of the aluminum seal material is determined based on the histogram obtained as described above.

  In Patent Document 2, as a problem of analysis based on the infrared thermal image of Patent Document 1, if the measurement environment varies due to the small heat capacity of the lid, the value of abnormally high temperature or the shape of adhesion abnormality Pointed out that the temperature distribution of the aluminum seal material fluctuates, and proposed an inspection method in which the detection rate of adhesion failure of the aluminum seal material does not change even if the measurement temperature environment fluctuates. Specifically, the invention of Patent Document 2 proposes that the temperature of the measurement environment is detected by a temperature sensor and corrected based on the temperature deviation from the reference.

Japanese Patent Laid-Open No. 10-318955 JP 2003-307506 A

  As described above, in the food production line, the process of sealing the container filled with the contents with the lid is automated, and the lid and the high-frequency induction heating device are applied to the containers sent one after another at a predetermined line speed. The inner lid is heated by. For proper adhesion of the inner lid, it is required to heat the inner lid at an appropriate temperature. If the heating temperature is too low, the inner lid will be poorly bonded. Conversely, if the heating temperature is too high, the inner lid will be burnt. There is a problem that it becomes difficult to peel off the inner lid when the inner lid is opened because the adhesion of the inner lid becomes too strong.

  Adhesion by the high frequency induction heating device varies depending on the environmental temperature as pointed out in Patent Document 2 described above. Examples of the environmental temperature include seasonal factors, nighttime and daytime, production line atmosphere temperature, contents of containers, and temperatures of packaging materials (containers and sealing materials). Therefore, the line manager adjusts the output of the high-frequency induction heating device in consideration of various factors. At that time, it is immediately based on objective data whether the set output is appropriate or not. There is a request to confirm.

  An object of the present invention is to provide a method for determining suitability of adhesion of an inner lid by high-frequency induction heating, which can meet the above-mentioned request of a line manager.

  A further object of the present invention is to provide simplicity in the output adjustment work of the high frequency induction heating apparatus in a food production line in which the inner lid is bonded to the mouth of the container by high frequency induction heating while the container is being conveyed at a predetermined line speed. An object of the present invention is to provide a method for determining the suitability of the inner lid heating temperature by high frequency induction heating.

According to the present invention, the above technical problem is
In the container covering line including the step of covering the mouth of the container while transporting the container, and then bonding the inner lid to the mouth of the container with a high frequency induction heating device,
When adjusting the heating temperature of the high-frequency induction heating device, a step of attaching an irreversible thermolabel to the inner lid;
Next, the step of adhering the inner lid to the mouth of the container by the high-frequency induction heating device in the container lid line;
Removing the container that has been heated by the high-frequency induction heating device from the container lid line;
And determining whether or not the output adjustment of the high-frequency induction heating device is appropriate based on the color of the thermolabel attached to the inner lid taken out from the container lid line. This is achieved by providing a method for determining the suitability of the lid heating temperature.

  Typically, when the line manager adjusts the output of the high-frequency induction heating device, the output of the high-frequency induction heating device is set by applying the present invention. The line manager can perform a test using the thermo label in a state where the container covering line is actually operated, and can determine whether the output of the high frequency induction heating apparatus is appropriate based on the color of the thermo label.

  Currently available thermolabels can be classified into two types: reversible and irreversible. The irreversible thermolabel changes its color in response to the highest ambient temperature, and this color has the property of maintaining even when the ambient temperature is lowered. In the present invention, by employing an irreversible thermo label, the maximum temperature of the inner lid heated by the high frequency induction heating device can be known based on the color of the thermo label.

  Currently available irreversible thermolabels are classified in 5 ° C increments, and in the case of bonding the inner lid to a glass bottle, for example, three types of thermolabels of 105 ° C, 110 ° C and 115 ° C are used. The output adjustment of the high frequency induction heating device can be simplified. More specifically, assuming that 110 ° C. is the optimum temperature for heating the lid, which is the object to be heated, when all three types of thermo labels of 105 ° C., 110 ° C., and 115 ° C. are discolored, the output of the high frequency induction heating device Means that the line manager is too high, and the line manager performs an operation of reducing the output of the high-frequency induction heating device.

  Conversely, when only the 105 ° C thermolabel changes color and the 110 ° C and 115 ° C thermolabels do not change, it means that the output of the high frequency induction heating device is too low, so the line manager An operation for increasing the output of the high-frequency induction heating apparatus is performed.

  When the 105 ° C. and 110 ° C. thermo labels change color and the 115 ° C. thermo label does not change color, it means that the output of the high frequency induction heating device is appropriate. By setting this output of the apparatus, the output adjustment of the high frequency induction heating apparatus can be completed.

It is the figure which carried out the cross section of the mouth part of the container with which the Example of this invention is applied, and the lid | cover screwed to this. It is a figure which shows the container lid line contained in a foodstuff production line, Comprising: It is a figure for demonstrating the adhesion process of the inner lid | cover by the high frequency induction heating following the lid | cover fastening process of the container filled with the contents. It is a figure for demonstrating the view of the determination using the three thermo labels from which detection temperature differs.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a view for explaining sealing of a synthetic resin container by an inner lid. With reference to FIG. 1, the code | symbol 1 shows the opening part of a container. The mouth portion 1 of the container has a screw thread 2 on its outer peripheral surface, and a cap, that is, a lid 3 is screwed using the screw thread 2. The lid 3 includes an outer lid 5 made of synthetic resin and an inner lid 6 positioned between the opening end 1 a of the container mouth portion 1. The inner lid 6 is made of a laminated material of a heat-meltable resin film 8 and an aluminum foil 9 as in the prior art, and is a container with the heat-meltable resin film 8 facing down and the aluminum foil 9 facing up. It is positioned at the opening end 1a of the mouth portion 1.

  FIG. 2 is a diagram illustrating a part of the food production line 10. The food production line 10 uses a high-frequency induction heating device 14 in a lid tightening process in which the lid 3 is attached to the container 12 filled with the contents, and the lid 3 is screwed into the container mouth 1 and in the next process. And a sealing step of heating the lid 3 portion of the container 12 in a non-contact state. In this sealing step, the aluminum foil 9 of the inner lid 6 is heated by the output of the high-frequency induction heating device 14, and the heat-meltable resin film 8 is melted by this heat, and the inner lid 6 is welded to the opening end 1 a of the container mouth 1. As a result, the container 12 is sealed. The output of the high-frequency induction heating device 14 can be adjusted stepwise from high output to low output by operating a manual dial.

  Typically, when the line manager changes the temperature around the high-frequency induction heating device 14 such as at the turn of the season or particularly on a cold day and the output of the high-frequency induction heating device 14 needs to be adjusted, the lid 3 has three types. A thermolabel having a different detection temperature or a thermolabel 16 having a single detection temperature (FIG. 1) is attached to a plurality of locations, and heat treatment is performed by the high-frequency induction heating device 14. This heat treatment is performed under normal operating conditions of the food production line 10.

  A determination method using the thermo label 1 will be described below with reference to FIG. 3 assuming that the optimum heating temperature at which the inner lid 6 is welded to the open end 1a of the container mouth portion 1 is 105 ° C. In general, available thermolabels are broadly classified as reversible and irreversible. In the embodiment, an irreversible thermo label is employed, and three types of thermo labels 16 having sensitivity temperatures of 105 ° C., 110 ° C., and 115 ° C. are prepared. For convenience of explanation, the 105 ° C. thermo label 16 is referred to as a low temperature label, the 110 ° C. thermo label 16 is referred to as an appropriate temperature label, and the 115 ° C. thermo label 16 is referred to as a high temperature label.

  As one method, for example, four low temperature labels 16 are attached to the upper surface of the inner lid 6, more specifically, the portion where the inner lid 6 is in contact with the opening end 1 a of the container, and the output of the high frequency induction heating device 14 is “ As a result of heating with the setting "high", it is assumed that all of the four low temperature labels 16 have changed color as shown in FIG. Next, as a result of performing the trial by the high frequency induction heating device 14 by sticking the four appropriate temperature labels 16 to the upper surface of the inner lid 6 in the same manner, as shown in FIG. Assume that everything has changed color. Next, as a result of performing the trial by the high frequency induction heating device 14 by similarly sticking the four high temperature labels 16 to the upper surface of the inner lid 6, as shown in FIG. Assume that everything has changed color. Since this state means that the output of the high frequency induction heating device 14 is too high, an operation of lowering the output of the high frequency induction heating device 14 is performed.

  After the operation of lowering the output of the high-frequency induction heating device 14 to “medium”, the low temperature label 16, the appropriate temperature label 16, and the high temperature label 16 were attached again, and the above trials were performed. If all of the labels 16 are discolored and all of the four appropriate temperature labels 16 are discolored, but the four high-temperature labels 16 are not discolored, this output state (“medium” output) is determined to be optimal. it can.

  Furthermore, as a result of setting the output of the high-frequency induction heating device 14 to “low” and attaching the low temperature label 16, the appropriate temperature label 16, and the high temperature label 16 again, and performing the above trial, 4 If all the low-temperature labels 16 are discolored and the four appropriate temperature labels 16 and the four high-temperature labels 16 are not discolored, it can be determined that the output state is weak. As a result, the high-frequency induction heating device 14 You can be confident that the output “medium” is optimal.

  The output adjustment of the high-frequency induction heating device 14 suitable for the heating condition to be set as described above is prepared with a total of three types of thermo labels, the heating temperature to be set or a temperature in the vicinity thereof, and the upper and lower temperatures thereof, It is possible to easily optimize the output adjustment by using a thermolabel in an actual operation state of the food production line.

  As a modification, a plurality of low temperature, appropriate temperature, and high temperature three thermo labels 16 are attached to the surface of the inner lid 6, that is, the portion where the inner lid 6 is in contact with the opening end 1 a of the container, and at an actual line speed. When heated by the high-frequency induction heating device 14, it is determined whether the output adjustment of the high-frequency induction heating device 14 is optimal based on the above-described concept based on the color change of each of the three types of thermo labels 16. It may be.

1 Container mouth 3 Lid (cap)
5 Outer lid 6 Inner lid 8 Heat-meltable resin film 9 Aluminum foil 10 Food production line (container lid line)
12 container 14 high frequency induction heating device 16 thermo label

Claims (3)

In the container covering line including the step of covering the mouth of the container while transporting the container, and then bonding the inner lid to the mouth of the container with a high frequency induction heating device,
When adjusting the heating temperature of the high-frequency induction heating device, a step of attaching an irreversible thermolabel to the inner lid;
Next, heating the inner lid with the high frequency induction heating device in the container lid line and bonding it to the mouth of the container;
Removing the container that has been heated by the high-frequency induction heating device from the container lid line;
And determining whether or not the output adjustment of the high-frequency induction heating device is appropriate based on the color of the thermolabel attached to the inner lid taken out from the container lid line. Appropriateness determination method of lid heating temperature. A first thermo label in which a heating temperature suitable for bonding the inner lid to the mouth of the container or a temperature close thereto is set as a sensitive temperature;
A second thermo label having a temperature close to a heating temperature suitable for bonding the inner lid to the mouth of the container, but a temperature lower than the suitable heating temperature as a sensitive temperature;
The temperature is close to the heating temperature suitable for adhering the inner lid to the mouth of the container, but three types of thermostats with a third thermolabel whose temperature is higher than the suitable heating temperature is the sensitive temperature. Prepare a label
The method for determining suitability of the inner lid heating temperature by high-frequency induction heating according to claim 1, wherein the method is performed using the first to third thermo labels. Covering the mouth of the container while transporting the container, and then heating the inner lid with a high frequency induction heating device and bonding it to the mouth of the container, the output of the high frequency induction heating device of the container lid line When adjusting
A first irreversible thermolabel whose heating temperature suitable for bonding the inner lid to the mouth of the container or a temperature close thereto is the sensitive temperature;
A second irreversible thermolabel having a temperature close to a heating temperature suitable for adhering the inner lid to the mouth of the container, but a temperature lower than the suitable heating temperature as a sensitive temperature;
The temperature is close to the heating temperature suitable for adhering the inner lid to the mouth of the container, but the third irreversible thermolabel whose temperature is higher than the suitable heating temperature is the sensitive temperature. Prepare different types of thermo labels,
With the first to third thermolabels attached to the inner lid, the inner lid is heated and adhered to the mouth of the container by the high-frequency induction heating device, and the three types of thermolabels are discolored. A method for determining the suitability of an inner lid heating temperature by high frequency induction heating, wherein the suitability of output adjustment of the high frequency induction heating device is judged.

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