JPH09243488A - Apparatus for measuring internal pressure of can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain measuring data effective to thin an aluminum can and correctly determine a proper operation of a sterilization device based on the measuring data, by providing a can internal pressure-measuring part and a boiler internal pressure- measuring part, and calculating a differential pressure between a pressure in a can and a pressure in a boiler. SOLUTION: A can internal pressure-measuring unit 12 is stored and protected within a heatproof and pressure-resistant container. An internal pressure of canned food and an internal pressure of a boiler can be correctly and continuously measured at the same time. The measured pressure is corrected by a correcting part 29 based on a temperature in the heatproof and pressure-resistant container. A pressure inside a can, a temperature inside the can and the pressure in the boiler stored in a memory part 26 are separately distinguished and read into a computer. A graph of pressure changes in a sample can A and the boiler is obtained by processing measuring data. A can temperature-measuring part 25 measuring a temperature in a second sample can B processes the same way and obtains a graph of temperature changes. Whether a sterilization treatment is properly carried out or not is detected from a holding state of the temperature in the canned food, and a tolerance of the can is detected from a differential pressure between the pressure in the can and the pressure in the boiler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a can internal pressure measuring device capable of continuously measuring a change in pressure inside a can.

[0002]

2. Description of the Related Art Conventionally, in the process of producing canned food in which beer is sealed, the canned food in which the liquid temperature is 3 to 5 ° C. and filled and sealed is heat-sterilized by using a device called a pasterizer. It is supposed to do. In addition, even if the contents are low in pH and do not need to be sterilized, such as canned canned carbonated beverages, dew condensation will occur on the can surface, making it impossible to print on the canned surface in a later process, or packaging. In order to prevent the corrugated cardboard for use from getting wet, a device called a warmer is used to heat the cardboard to raise the temperature of the can to room temperature or higher.

By the way, in recent years, aluminum is often used as a material for cans in which beverages are sealed, but from the viewpoint of resource saving, the thickness of aluminum cans has been reduced. Accordingly, it is necessary to continuously measure how the pressure inside the aluminum can changes when the aluminum can is heated by the above-described device such as a pasterizer or a warmer. For example, Japanese Patent Application Laid-Open
In Japanese Patent No. 180720, a can internal pressure measuring device suitable for measuring a change in internal pressure of an aluminum can is proposed.

This can internal pressure measuring device will be briefly described with reference to FIG. 8. Reference numeral 1 in FIG. 8 indicates the can internal pressure measuring device,
A cylindrical blind stopper 5 made of an elastic body is fitted in a through hole 4 penetrating the lid 3 attached to the sample can 2. On the outer surface of the sample can 2, a pressure measuring device 6
Is fixed by a rubber band 7, and the internal pressure of the sample can 2 is measured by the pressure measuring device 6 through a thin rubber tube 8 having a thin hollow needle 9 that is pierced by the blind plug 5.
Have been introduced to.

A can internal pressure measuring device 1 constructed as described above.
Is carried on the conveyor together at a rate of one in every 1,000 to 10,000 cans produced, and is subjected to heat sterilization treatment. Then, the pressure data in the sample can 2 measured and stored by the pressure measuring device 6 is read after the heating process is completed, so that it is determined whether or not the can specifications are properly selected. There is. For example, if the can strength specification is too high for the can pressure,
The cans can be made even thinner to reduce costs.

By the way, in canning for sealing low-acidic beverages such as coffee, for example, the canning is sealed in a high-temperature and high-pressure pot, pressurized and heated, and sterilized by maintaining the high-temperature and high-pressure state for a long time. Has been done. Therefore,
Thus, in order to continuously measure the change in the pressure inside the can of sterilized inside the high-temperature high-pressure kettle, the internal can pressure measuring device itself must be positioned inside the high-temperature high-pressure kettle.

[0007]

However, since the conventional can internal pressure measuring device has neither heat resistance nor pressure resistance, it is possible to measure the internal pressure of a can of sterilized inside a high temperature and high pressure kettle. At the same time, even if the internal pressure of the can is measured, since the temperature around the can is high temperature and high pressure, only the relative can pressure can be obtained. The internal pressure could not be measured. In particular, when the pressure inside the kettle is not constant and changes, or when the change in the pressure inside the kettle is not synchronized with the change in the pressure inside the can, it is difficult to obtain a mutual correlation and an accurate can pressure Could not be measured.

The present invention has been made in view of the above circumstances, and is a cordless, accurate and continuous measurement of changes in the can internal pressure of cans that require long-term sterilization even in a high temperature and high pressure kettle. It is an object of the present invention to provide a can internal pressure measuring device that can be used.

[0009]

The present invention has the following features to attain the object mentioned above. That is, the can internal pressure measuring device according to claim 1 is a can internal pressure measuring device that continuously measures a pressure change inside a can of a can, which is sealed in a kettle, and measures the pressure change inside the can with time. A can pressure measuring unit, a can pressure measuring unit that measures changes in the pressure in the can over time, a memory that stores data measured by the can pressure measuring unit and the can pressure measuring unit Department,
A control unit that controls the operation of the can internal pressure measurement unit, the kettle internal pressure measurement unit, and the storage unit, a power supply unit that supplies electric power to each unit, the can internal pressure measurement unit, and the cauldron internal pressure measurement unit. , A storage unit, a control unit, and a power source unit, respectively, and a pressure-introducing means for introducing the pressure inside the can into the pressure measuring unit in the can are adopted.

Since this can internal pressure measuring device is provided with a can internal pressure measuring part and a can internal pressure measuring part for measuring the pressure inside the can and the pressure inside the kettle, respectively, the state of being placed in the high temperature and high pressure kettle is shown. Thus, the pressure inside the can and the pressure inside the kettle are measured at the same time. Therefore, by calculating the differential pressure of the can internal pressure with respect to the can internal pressure, an accurate can internal pressure can be obtained in consideration of the effect of the can internal pressure. In addition, the components that consist of the can internal pressure measuring unit, the kettle internal pressure measuring unit, the storage unit, the control unit, and the power supply unit that are necessary for continuously measuring changes in pressure are stored in a heat resistant and pressure resistant container for protection. Therefore, the pressure inside the can and the pressure inside the kettle can be accurately and continuously obtained even when the can is placed inside the high temperature and high pressure kettle.

According to a second aspect of the present invention, there is provided a can internal pressure measuring apparatus according to the first aspect, further comprising a temperature measuring section to which a sensor for measuring the temperature inside the can is connected. A technique is adopted in which the data measured by the temperature measurement unit is stored and the control unit also controls the temperature measurement unit.

Since this can internal pressure measuring device is provided with a temperature measuring portion to which a sensor for measuring the temperature inside the can is connected, the pressure inside the can and the temperature inside the can are measured at the same time, and the correlation with time changes. The relationship is obtained accurately.

According to a third aspect of the present invention, there is provided a can internal pressure measuring apparatus according to the first or second aspect, wherein the control section measures and stores the pressure at a set time interval. A technique for controlling the pressure measuring unit in the can, the pressure measuring unit in the kettle, and the storage unit is adopted.

In this can internal pressure measuring device, the control section is
By controlling the pressure measuring unit in the can, the pressure measuring unit in the kettle, and the storage unit so as to measure the pressure and temperature at the set time intervals, the measurement time and the capacity of the storage unit are taken into consideration to obtain an appropriate value. A number of measurement data are collected continuously.

A can internal pressure measuring device according to claim 4 is the can internal pressure measuring device according to any one of claims 1 to 3, further comprising fixing means for integrally fixing the heat-resistant pressure-resistant container and the canned product. A technique is adopted in which the means includes a heat-resistant pressure-resistant container and a cushioning member that protects the can of food from contact with other cans.

In this can internal pressure measuring device, since the heat resistant and pressure resistant container and the fixing means for mounting and fixing the canned food together are provided, the distance between the canned food and the heat resistant and pressure resistant container is kept constant. It is possible to maintain the pressure and prevent the pressure introducing means connecting the two from being loaded.
Further, since the fixing means is provided with the cushioning member, even if the can internal pressure measuring device of the present invention is allowed to flow through the production line together with other canned products to be produced, contact with these other canned products is caused. Vibration is suppressed, accurate measurement data can be obtained easily, and the appearance of other canned goods is not easily scratched.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a can internal pressure measuring device according to the present invention will be described below with reference to FIGS. 1 to 5. In these drawings, reference numeral 11 is a can internal pressure measuring device,
12 is an internal pressure measuring unit, 13 is a heat-resistant pressure-resistant container, 14
A and 14B are pressure introducing means, and 15 is a storage box.

The internal pressure measuring device 11 of this embodiment is shown in FIG.
As shown in FIG. 2, a heat-resistant pressure-resistant container 13 having a can internal pressure measuring unit 12 (not shown) housed therein, and the internal pressure of the first sample can A are adjusted to the can internal pressure measuring unit 12
14A for introducing pressure into the heat-resistant and pressure-resistant container 1
3 and the first sample can A, and a storage box 15 as a fixing means for integrally fixing the sample can A.

The heat and pressure resistant container 13 is a box-shaped container made of a metal that does not easily rust, such as stainless steel or aluminum alloy, and has rectangular plate-shaped flanges 13a fixed to both ends thereof for storage. It is supported in the box 15. The heat and pressure resistant container 13 is designed to be used in a temperature range of 0 ° C to 150 ° C, and the equipment housed therein is completely waterproofed under an external pressure of 3 atm or less. Therefore, the can internal pressure measuring unit 12 stored therein is protected.

Further, as shown in FIGS. 3 and 4, in the heat and pressure resistant container 13, the can internal pressure measuring unit 12 is connected to an external selector 20 and a computer 21 via a connection cable 21a so as to read out measurement data. In addition to the measurement terminal of the flange 13, the starting unit 22 that starts the internal pressure measuring unit 12 at the time of measurement is the flange 13
It is inserted and fixed in a through hole (not shown) provided in a. A charging terminal for charging a power source can be inserted into the through hole.

As shown in FIG. 5, the can internal pressure measuring unit 12 measures the internal pressure of the first sample can A, the internal pressure measuring unit 23, and the change of the internal pressure of the kettle. A pot internal pressure measuring unit 24 that measures with time, a can internal temperature measuring unit 25 that measures the temperature inside the second sample can B with a sensor 25a over time, and a storage unit 26 that stores the measured data. It has a control unit 27 for controlling the operations of the can internal pressure measuring unit 23, the kettle internal pressure measuring unit 24, and the storage unit 26, and a power supply unit 28 for supplying electric power to each unit.

The in-can pressure measuring unit 23 measures the pressure in the first sample can A introduced by the pressure introducing means 14A using a strain gauge, and measures the temperature in the heat and pressure resistant container 13. A correction unit 29 that corrects an error in pressure measurement based on the data obtained from the temperature sensor 29a inside the kettle is provided.

The inside pressure measuring portion 24 is provided with a flange 13
It has an introducing portion 24a protruding outward in the state of "a", and the pressure inside the kettle introduced from the introducing portion 24a is measured using a strain gauge. Note that, for example, in the case of a warmer or the like, since the pressure inside the kettle does not have a great influence on the pressure inside the can, the introduction portion 24a of the in-kettle pressure measuring unit 24 has a pressure as shown in FIG. , The third sample can C
Pressure introducing means 14B for introducing the internal pressure of the above into the internal pressure measuring unit 12 is attached. That is, the pressure in the two cans of the first sample can A and the third sample can C can be measured by the can pressure measuring unit 23 and the kettle pressure measuring unit 24, respectively, and the reliability of the measurement can be improved. Can be improved.

The inside temperature of the can 25 is measured by the flange 13
A can temperature sensor 25b such as a thermocouple connected to the connection part 25a in a penetrating state is stored, and the temperature in the second sample can B measured by the can temperature sensor 25b is stored as an electrical signal. It is transmitted to the unit 26.

The storage unit 26 stores 10 times per measurement.
It is equipped with a capacity for storing the measured data of the internal pressure of the can, the internal pressure of the kettle, and the internal temperature of the heat resistant and pressure resistant container, which is composed of 00 data, for five times. The control unit 27 controls the internal pressure measuring unit 23,
The pressure inside the first sample can A is controlled by controlling the pressure inside the kettle 24, the temperature inside the can 25 and the memory 26.
The time interval for measuring the pressure in the kettle (or the pressure in the third sample canister C) and the temperature in the second sample canister B can be set to an arbitrary interval.

Further, the control unit 27 can adjust the delay time from the start of the operation of the internal pressure measuring unit 12 to the start of the measurement. And
Based on the control signal of the external computer 21, the stored measurement data is read out and sent to the computer 21. The power supply unit 28 has a built-in battery that can be charged by external power, and enables continuous measurement for up to 4 hours.

The pressure introducing means 14A and 14B are the first
Of the sample can A and the third sample can C, the heat resistant and pressure resistant packing 31 made of silicon rubber fitted in the through holes penetrating the bottom of the can, and one end of the packing 31 is pierced. The first thin pipe 32 made of stainless steel and the second thin pipe made of stainless steel which is connected to the pipe 32 via the connector 33 and is connected to the introduction portion 23a of the in-can pressure measuring unit 23. And a pipe 34.

The inner volume of the portion between the first sample canister A and the pipe connecting portion 12 of the heat and pressure resistant container 13 is set to the minimum, which hinders the measurement of the pressure in the first sample canister A. Is not to come. In addition, the first
In the periphery of the packing 31 attached to the bottom of the sample can A, a silicone sealant is applied to both the inner and outer surfaces of the can so that no pressure loss occurs from the fitting portion between the first sample can A and the packing 31. Is being done.

Further, the bottom of the second sample can B has
One end of the in-can temperature sensor 25b is pierced through the heat resistant and pressure resistant packing 31 similar to the above, which is fitted in the penetrating through hole.

In the present embodiment, the storage box 15 is a box having a substantially rectangular bottom surface 35 with an open top, and the heat and pressure resistant container 13 is placed on the bottom surface 35 to support a can. With the jig 36, the first sample can A and the second sample can A
The sample canister B and the third sample canister C, if necessary, are placed and fixed side by side on the bottom surface 35, respectively.

The can support jig 36 is provided with substantially semicircular cutouts 36a, 36b and 36c which are fitted onto the can bodies of the first, second and third sample cans A, B and C, respectively. The first, second, and third sample cans A, B, and C can be easily attached and detached, and also securely held so as not to tilt.

Further, in the present embodiment, the storage box 15
A cushioning member 37 made of a strip plate arranged so as to surround the outer periphery of the upper part of the is fixed to a frame 38 suspended from the bottom surface 35.
Another can that is thrown into the sterilization processing apparatus together with is prevented from falling down inside the storage box 15 and damaging the pressure introducing means 14A and the like.

The height of the storage box 15 is appropriately changed by using the frame 38 having a length corresponding to the size of the sample can to be measured. For example, as shown in FIG. 2, the frame 38a is for 250 ml, the frame 38b
Has a length corresponding to a sample can for 350 ml, and the frame 38c has a length corresponding to a sample can for 500 ml. Further, two rods 40 are erected on the bottom surface 35, and a support tool 41 is fixed to each of these rods 40. These support members 41 are pressure introducing means 41A, 4 respectively.
The connector 1B of 1B is gripped to reduce the influence of vibration applied to the pressure introducing means 41A, 41B during transportation or the like.

Next, a procedure for measuring the pressure inside the first sample can A using the can internal pressure measuring device 11 of the present embodiment configured as described above will be described. First, the first
Then, the second sample cans A and B are manufactured by a normal canning process, and the inside thereof is filled with, for example, coffee or the like and sealed.

Then, the heat and pressure resistant container 13 is placed on the bottom surface 35, and the first and second sample cans A and B are placed.
Are fixed in the storage box 15 by the can support jig 36. Next, the needle portion of the pressure introducing means 14A is pierced through the can bottom of the first sample can A, and high vacuum silicon grease is applied to the periphery thereof to maintain airtightness. Further, a first pipe 32 connected to the needle portion and a second pipe 34 connected to the can internal pressure measuring unit 12 are connected by a connector 33.

Further, the can bottom of the second sample can B is pierced with one end of the can temperature sensor 25b, and high vacuum silicon grease is applied to the periphery thereof to maintain airtightness. In addition, the introduction portion 24a of the pot pressure measuring unit 24,
It is in an open state so that the pressure in the kettle can be directly measured without attaching the pressure introducing means 14B.

The can internal pressure measuring device 11 which has been prepared as described above is placed on the conveyor along with a large number of cans produced in the can production line. At this time, the internal pressure measuring unit 12 is activated by attaching the activation block 22 to the main body of the heat and pressure resistant container 13. As a result, the control unit 27 of the can internal pressure measuring unit 12
When the set delay time elapses, the internal pressure measuring unit 2
3. The pressure measurement unit 24 and the storage unit 26 are operated to start pressure measurement.

The can internal pressure measuring device 11 carried into the sterilization processing device by the transfer conveyor is hermetically sealed in a high temperature and high pressure vessel along with a number of other cans, and is gradually heated and pressurized. At this time, the control unit 27 of the internal pressure measuring unit 12 causes the internal pressure measuring unit 23 to measure the internal pressure of the first sample can A every time a set time, for example, 3 seconds elapses. The internal pressure measuring unit 24 is caused to measure the pressure inside the kettle, and both obtained measurement data are stored in the storage unit 26.

Therefore, the can internal pressure measuring device 11 of the present embodiment can store a maximum of 1000 pieces of data per measurement in the storage unit 26. Therefore, when measuring at 3 second intervals, 3 seconds are required. It is possible to measure the change in pressure inside the first sample can A and inside the pot over time over 1000 times, that is, for about 50 minutes.

In the present embodiment, the correction unit 29 of the can internal pressure measuring unit 12 uses the can internal pressure measuring unit 12 based on the measurement data of the kettle internal temperature sensor 29a arranged in the heat and pressure resistant container 13. Since the measurement result of 23 is appropriately corrected and sent to the storage unit 26, the pressure inside the sample can A can be measured regardless of the change in the temperature inside the heat-resistant pressure-resistant container 13. ing.

The heat resistant and pressure resistant container 13 of the can internal pressure measuring device 11 of the present embodiment taken out from the high temperature and high pressure kettle after the sterilization treatment is removed from the storage box 15 and connected to the selector 20 and the external computer 21, The measurement data stored in the storage unit 26 is read. At this time, the switch 20a provided in the selector 20 causes the can internal pressure, the can internal temperature, or the kettle internal pressure stored in the storage unit 26 (in the case of a warmer or the like, the can internal pressure of the third sample can C). Are selected and read into the computer 21. Then, by processing the read measurement data, a pressure change graph in the sample can A and the pot as shown in FIGS. 7 and 8 is obtained.

The in-can temperature measuring unit 25, which measures the temperature in the second sample can B, is processed in the same manner, as shown in FIG.
And the temperature change graph of the sample can B as shown in FIG. 8 is obtained. According to these graphs, since the temperature inside the canned product maintains a predetermined value for 20 minutes or more, it can be confirmed that the sterilization treatment is properly performed.

The maximum pressure inside the can at this time is about 5.
The pressure in the can is 5 atm, and the pressure in the kettle is taken into consideration.
In other words, it is possible to confirm that the maximum pressure difference of the pressure inside the can with respect to the pressure inside the kettle is about 4.2 atm, and that the pressure within the can is within the allowable strength of the can without any abnormal change in the pressure inside the can.

That is, the can internal pressure measuring device 1 of this embodiment
In 1, the in-can pressure measuring unit 25 and the in-can pressure measuring unit 2 for measuring the pressure in the sample can A and the pressure in the kettle
Since each is equipped with 4, the can internal pressure and the kettle internal pressure are simultaneously measured in the state of being placed in the high temperature and high pressure kettle. Therefore, by calculating the pressure difference between the can internal pressure and the can internal pressure, an accurate can internal pressure can be obtained in consideration of the effect of the can internal pressure.

Further, the internal pressure measuring unit 23, the internal pressure measuring unit 24, the storage unit 26, the control unit 27, and the power source unit 28, which are necessary for continuously measuring changes in pressure, are the internal pressure units. Since the measurement unit 12 is stored in the heat-resistant pressure-resistant container 13 for protection, the pressure inside the can and the pressure inside the kettle can be accurately and continuously obtained even when the measurement unit 12 is placed inside the high-temperature high-pressure kettle.

Then, an in-can temperature measuring unit 25 to which an in-can temperature sensor 25a for measuring the temperature in the sample can B is connected.
With the provision of, the pressure and temperature inside the can can be measured at the same time, and the mutual correlations over time can be accurately obtained. Further, the control unit 27 opens the set time interval to measure the pressure and the temperature, so that the internal pressure measuring unit 23, the internal pressure measuring unit 24, and the storage unit 2 are measured.
By controlling 6, the appropriate number of measurement data is continuously collected in consideration of the measurement time and the capacity of the storage unit 26.

Further, since the heat-resistant and pressure-resistant container 13 and the sample cans A and B are mounted and fixedly fixed to each other, the distance between the sample canisters A and B and the heat-resistant and pressure-resistant container 13 is increased. Can be kept constant, and thus load is prevented from being applied to the pressure introducing means 14A, 14B connecting between the two. Further, since the fixing means is provided with the buffer member 37, even if the can internal pressure measuring device 11 of the present invention is flown into the production line together with other canned products to be produced, contact with these other canned products is possible. Vibrations and the like are suppressed, accurate measurement data can be easily obtained, and the appearance of other cans is less likely to be damaged.

Further, since the correction unit 29 for correcting the pressure to be measured based on the temperature in the heat and pressure resistant container 13 is provided in the can internal pressure measuring unit 12, the internal pressure of the sample can A is kept in the heat and pressure resistant container 13. It can be measured without being affected by temperature.

The present invention includes the following embodiments. (1) In the can internal pressure measuring device 11 of the present embodiment, the can internal pressure measuring unit 12 includes the can internal temperature measuring unit 25 for measuring the temperature in the second sample can B, so that Although the situation was measured, it may be measured by other means. For example, a sample can incorporating a microminiature temperature measuring and recording device for measuring and recording the temperature inside the can may be arranged near the first sample can A to measure the temperature inside the can.

(2) The case of using for measuring the pressure inside the can of the high temperature and high pressure kettle has been described as an example, but the can internal pressure measuring device 11 of this embodiment is the inside of the can of the past riser or warmer. It can also be used to measure changes in pressure.

(3) As the sample cans to be measured, one for the pressure inside the can and one for the temperature inside the can were installed. However, by adding the internal pressure measuring unit and the internal temperature measuring unit, a plurality of cans can be obtained. The sample cans may be measured. In this case, the more sample cans that are measured, the more reliable the data.

[0052]

According to the present invention, the following effects can be obtained. (1) According to the can internal pressure measuring device of claim 1, since the can internal pressure measuring part and the can internal pressure measuring part for respectively measuring the pressure inside the can and the pressure inside the can are cordlessly provided, the high pressure high temperature It is possible to measure the pressure inside the can and the pressure inside the can, and by calculating the differential pressure between the can pressure and the can pressure, the accurate can pressure considering the influence of changes in the can pressure Can be obtained. As a result, it is possible to continuously and accurately measure the change in the internal pressure of cans that have been sterilized in the high-temperature high-pressure kettle, which could not be measured in the past, considering the effect of the pressure change in the kettle. Therefore, not only is it possible to obtain measurement data that is extremely effective in reducing the thickness of aluminum cans, but it is also possible to more accurately determine whether or not the sterilization equipment is operating properly based on the measurement data. it can.

According to the can internal pressure measuring device of claim 2,
Since the temperature measuring unit to which the sensor for measuring the temperature inside the can is connected is provided, the pressure inside the can and the temperature can be measured at the same time, and the mutual correlations over time can be accurately obtained.

According to the can internal pressure measuring device of claim 3,
The control unit controls the in-can pressure measuring unit, the pot pressure measuring unit and the storage unit so as to measure a pressure and a temperature at set time intervals, thereby measuring the measurement time and the storage unit. It is possible to continuously collect an appropriate number of measurement data in consideration of the capacity and the accurate measurement data with the same synchronization that can be easily processed by the external computer.

According to the can internal pressure measuring device of claim 4,
Since the heat-resistant and pressure-resistant container and the fixing means for mounting and fixing the canned food together are provided, it is possible to prevent a load from being applied to the pressure introducing means that connects the canned food and the heat-resistant pressure-resistant container, and to buffer the pressure. By providing the member, vibration and the like due to contact with other canned food can be suppressed, and more accurate measurement data can be obtained. Furthermore, it is possible to prevent the appearance of other canned goods from being damaged.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a can internal pressure measuring device according to the present invention.

FIG. 2 is a side view showing an embodiment of a can internal pressure measuring device according to the present invention.

FIG. 3 is a perspective view showing a main part of an embodiment of a can internal pressure measuring device according to the present invention.

FIG. 4 is a perspective view showing an external selector and a computer in one embodiment of the can internal pressure measuring device according to the present invention.

FIG. 5 is a block diagram schematically showing the function of the can internal pressure measuring device according to the present invention.

FIG. 6 is a graph showing changes in pressure inside the can and in the kettle measured by the can pressure measuring device of the present invention.

FIG. 7 is a graph showing changes in pressure inside the can and in the kettle measured by the can pressure measuring device of the present invention.

FIG. 8 is a cross-sectional view showing a conventional example of a can internal pressure measuring device of the present invention.

[Explanation of symbols]

 11 can internal pressure measuring device 12 can internal pressure measuring unit 13 heat resistant and pressure resistant container 14A, 14B pressure introducing means 15 storage box 21 external computer 23 can internal pressure measuring unit 24 kettle internal pressure measuring unit 25 can internal temperature measuring unit 25b can internal temperature sensor 26 Storage unit 27 Control unit 28 Power supply unit 36 Can support jig 37 Cushioning member A First sample can B Second sample can C Third sample can

Claims (4)

[Claims] 1. A can internal pressure measuring device for continuously measuring a pressure change inside a can of a can, which is hermetically sealed in a kettle, and a can pressure measuring unit for measuring a change of pressure inside the can with time. A pot pressure measuring unit that measures changes in the pressure in the pot over time; a storage unit that stores data measured by the can pressure measuring unit and the pot pressure measuring unit; Section, a control section for controlling the operation of the pot internal pressure measuring section and the storage section, a power source section for supplying electric power to the respective sections, the can internal pressure measuring section, the pot internal pressure measuring section, the storage section, A can internal pressure measuring device comprising: a heat resistant and pressure resistant container in which each of the control unit and the power source unit is stored; and pressure introducing means for introducing the pressure inside the can of the can into the can internal pressure measuring unit. 2. The can internal pressure measuring device according to claim 1, further comprising a temperature measuring unit connected to a sensor for measuring the temperature inside the can, wherein the storage unit further includes data measured by the temperature measuring unit. The can internal pressure measuring device, wherein the control unit also controls the temperature measuring unit. 3. The can internal pressure measuring device according to claim 1 or 2, wherein the control unit measures the pressure at a set time interval and stores the pressure so as to store the pressure. An in-can pressure measuring device characterized by controlling a pressure measuring unit and the storage unit. 4. The can internal pressure measuring device according to claim 1, further comprising fixing means for integrally fixing the heat-resistant pressure-resistant container and the canned goods, the fixing means comprising the heat-resistant pressure-resistant container and the can. A can internal pressure measuring device comprising a cushioning member that protects a can of cans from contact with other cans.