JP2589576B2 - Simultaneous processing of different contents - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of manufacturing a container having a flexible content such as a plastic material and the like. More particularly, the present invention relates to a method for preventing deformation of all containers during simultaneous pressurization and heat treatment.

(Prior Art) Conventionally, a method for preventing the deformation of a container when the contents are filled with air and sealed and subjected to heat treatment under pressure is disclosed in JP-A-53-18 / 78.
No. 749, JP-A-53-118536, JP-A-59-66862 and JP-A-62-224269. However, these methods all relate to a method of air-filling the same type of contents into the same type of container, and then sealing and subjecting the container to pressure and heat treatment. Therefore, in the conventional method, when each of two or more containers is filled with different contents in a gas-filled manner and then sealed, and then the plurality of different containers are simultaneously subjected to the pressure heating treatment, the processing conditions under which all the containers are not deformed are set. It was impossible to set.

(Problems to be Solved by the Invention) The present invention is to provide a container made of a flexible material such as a plastic material, a paper material, an aluminum material, or the like, and to seal each of the two or more containers with different contents. It is another object of the present invention to provide a method for preventing deformation of all the containers when these are simultaneously subjected to a pressure and heat treatment.

(Means for Solving the Problems) The present inventors pneumatically fill two or more containers formed of a flexible material with different contents, respectively,
At the same time pressurizing and heating at the time of sealing, the characteristics of the container whether the inner pressure resistance or the outer pressure resistance is greater, and the inner pressure of the container due to the temperature change due to the pressurizing and heating treatment of the contents to be filled in the container Paying attention to the change, specifically, A) When the characteristics of all the containers are such that the internal pressure is higher than the external pressure, the rate of increase in the internal pressure of the processing tank used when heating the container containing the contents with the slowest temperature change B) All containers are subjected to heat treatment, and all containers are cooled at the rate of decrease in the processing tank internal pressure employed when cooling the container containing the contents with the fastest temperature change; or If the characteristics of the container are such that the internal pressure resistance is less than the external pressure resistance, heat processing is performed at the rate of increase in the internal pressure of the processing tank adopted when heating the container containing the contents with the fastest temperature change. The process used to cool the contained containers Performing cooling processing on all the containers in the decrease rate of the tank internal pressure, by, knowledge was obtained with the previous term problems can be achieved.

In general, when a container is filled with a content of air and then sealed and subjected to heat treatment under pressure, there is a proportional relationship between the temperature of the content and the internal pressure of the container. Therefore, if the temperature of the contents rises, the internal pressure of the container increases accordingly, and if the temperature of the contents decreases, the internal pressure of the container decreases accordingly. Further, the speed of the temperature change of the contents is greatly affected by the type and amount of the contents, and as a result, the speed of the change in the container internal pressure varies depending on the type of the contents. That is, if the container filled with the contents with the rapid temperature change is pressurized and heated, the pressure inside the container changes quickly, and if the container filled with the contents with the slow temperature change is pressurized and heated, the pressure inside the container is increased. Changes slow down.

This will be described with reference to the drawings. In FIG. 2, the vertical axis indicates pressure, and the horizontal axis indicates time, and includes contents whose temperature changes rapidly from the start of the pressurizing and heating process (at the time of heating) to the end of the pressurizing and heating process (at the time of cooling). It shows a change in the internal pressure of a container (a) filled with air and a change in the internal pressure of a container (b) filled with air containing contents whose temperature changes slowly. According to FIG. 2, when the container is heated in the processing tank, the internal pressure of the container (a) becomes higher than the internal pressure of the container (b), and when the container is cooled, the internal pressure of the container (a) becomes higher than that of the container (b). It turns out that it becomes low before internal pressure.

On the other hand, the containers are roughly classified into those having characteristics of internal pressure resistance> external pressure resistance and those having characteristics of internal pressure resistance <external pressure resistance. The case where the characteristics of the container are such that internal pressure resistance> external pressure resistance means that the container has a characteristic that the strength to withstand internal pressure is greater than the strength to withstand external pressure. In this case, when the external pressure increases, the container is easily deformed. Conversely, the case where the characteristics of the container are such that the internal pressure resistance is lower than the external pressure resistance means that the container has a characteristic that the strength withstanding the external pressure is greater than the strength withstanding the internal pressure. In this case, when the internal pressure increases, the container is easily deformed.

Therefore, in a case where two or more containers are each filled with different contents with air and then sealed and simultaneously subjected to heat treatment under pressure,
When the characteristics of all containers are internal pressure resistance> external pressure resistance, as described above, the container deforms when the external pressure increases, so that the internal pressure of the processing tank is set to be equal to or less than the external pressure resistance limit value of all the containers throughout the entire process of the pressurization and heat treatment. Thus, by performing the pressurization and heat treatment while adjusting the pressure inside the treatment tank to be low, it is possible to prevent deformation of all the containers. This will be described in more detail with reference to FIG. 1. When performing the heating under pressure, the heating is performed at the rate of increase in the internal pressure of the processing tank when heating the contents having a slow temperature change, that is, as shown in FIG. By heating so that the rate of increase of the internal pressure of the processing vessel matches the rate of increase of the internal pressure of the vessel (b), deformation of the vessels (a) and (b) during heating can be prevented. At this time, the internal pressure of the container (b) is 0 to
It is preferable to increase the internal pressure of the processing tank at a lower pressure of 0.6 kg / cm ² and in accordance with the rate of increase of the internal pressure of the container (b).

Next, at the time of cooling, the cooling process is performed at a decreasing rate of the internal pressure of the processing tank when cooling the contents having a rapid temperature change, that is, the internal pressure of the processing tank is reduced at a decreasing rate of the internal pressure of the container (a) shown in FIG. By cooling so that the falling rates of the containers are matched, deformation of the containers (a) and (b) during cooling can be prevented. At this time, it is preferable to lower the internal pressure of the processing tank at a pressure lower by 0 to 0.4 kg / cm ² than the internal pressure of the container (a) and in accordance with the decreasing rate of the internal pressure of the container (a).

Conversely, when two or more containers are air-filled with different contents and then sealed and simultaneously subjected to heat treatment under pressure, when the characteristics of all the containers are such that the internal pressure resistance is less than the external pressure resistance,
As described above, since the internal pressure is increased and deformed, so that the container internal pressure is equal to or less than the internal pressure resistance limit value of all containers throughout the entire process, by performing a pressurized heat treatment by adjusting the internal pressure of the processing tank to a high value, The deformation of all containers can be prevented. This will be described in detail with reference to FIG. 2. When performing the heating under pressure, the heating is performed at the rate of increase in the internal pressure of the processing tank when heating the contents having a rapid temperature change. By heating so that the rate of increase of the internal pressure matches the rate of increase of the internal pressure of the treatment tank, deformation of the containers (a) and (b) during heating can be prevented. At this time, it is preferable to increase the processing tank internal pressure at a pressure 0 to 0.6 kg / cm ² higher than the internal pressure of the container (a) and in accordance with the rate of increase of the internal pressure of the container (a).

Next, at the time of cooling, the cooling process is performed at a decreasing rate of the internal pressure of the processing tank when cooling the contents having a slow temperature change, that is, the decreasing rate of the internal pressure of the processing tank is reduced by the decreasing rate of the internal pressure of the container (b). By cooling to match, deformation of the containers (a) and (b) during cooling can be prevented. At this time, the internal pressure of the processing tank is preferably lowered at a pressure 0 to 0.4 kg / cm ² higher than the internal pressure of the container (b) and in accordance with the rate of decrease of the internal pressure of the container (b).

Based on the above method, two or more containers made of a flexible material such as a plastic material, a paper material, an aluminum material, etc. are filled with different contents, and then sealed and pressurized simultaneously under the same conditions. In the heat treatment, deformation of all the containers can be prevented.

In the present invention, the maximum heating temperature is set to 120 to 140 ° C. by the above method.
It is preferable to perform the treatment at a cooling temperature of 20 to 60 ° C., but the present invention is not limited to these conditions.
It can also be cooled below 20 ° C.

In the present invention, examples of the contents include solids, liquids, pastes, and mixtures thereof such as foods, medicines, and cosmetics.

As an application example of the present invention, it is possible to exemplify the prevention of deformation when a multi-chamber container in which rice, side dishes and the like are sealed, that is, a lunch container is subjected to pressurization and heat treatment. The method of the present invention is particularly useful for heat sterilization of a container provided with a plurality of storage portions (a plurality of sealable chambers for containing different foods) in a single container, wherein the storage portions are filled with different foods and sealed. It can be used very suitably as a method.

Example 1 The same type of molded container having an internal pressure resistance> an external pressure resistance (made of polypropylene, container thickness 0.9 mm, container inner length 15 cm, container inner width 12 cm,
Six oval dish-shaped containers having a depth of 3 cm and a capacity of 480 ml) were prepared, and three of them were filled with a consommé soup at 20%, 40%, and 60% of the container capacity and then sealed. The other three were air-filled with rice at 20%, 40%, and 60% of the container capacity and then sealed.

An experiment was conducted to examine the speed of the temperature change of the sample. In the experimental method, the six samples were stored in a constant temperature water bath maintained at 90 ° C., and the temperature of the contents was measured after 10 minutes. Table 1 shows the results.

From Table 1, in the order of the temperature change in the sample above, the consommé soup of 20%, 40% and 60% of the container volume, 20
%, 40%, 60% rice.

The six samples described above were placed in a processing tank, and the temperature and pressure were adjusted as shown in FIG. Note that all pressures are indicated by gauge pressure. First temperature
25 ° C., put hot water 80 ° C. in the processing bath of the state of the initial pressure 0kg / cm ^2, 85 ℃ in 1 minute, increasing the temperature and pressure 02kg / cm ^2,
Further, the temperature and pressure were increased to 121 ° C. and 1.3 kg / cm ² in 23 minutes. Subsequently, the pressure was gradually increased to 2.1 kg / cm ² while maintaining the temperature at 121 ° C. for 20 minutes, and the temperature and pressure were maintained as they were for 5 minutes. Thereafter, the pressure was kept at 2.1 kg / cm ² for 6 seconds after the cooling water was started to be introduced into the treatment tank, and then the temperature and pressure were lowered to 70 ° C. and 0.1 kg / cm ^{2 in} 5 minutes. Thereafter, the temperature and pressure were slowly lowered until the temperature and pressure reached 25 ° C. and 0 kg / cm ² in 20 minutes, and the pressure heating treatment was completed. According to these processing conditions, deformation of all containers could be prevented.

Comparative Example 1 An example in which processing conditions in which a container filled with air containing contents having the slowest temperature change during heating and cooling is not deformed is adopted is shown below.

Six samples similar to those used in Example 1 were prepared.

The six samples described above were placed in a processing tank, and the temperature and pressure were adjusted as shown in FIG. Note that all pressures are indicated by gauge pressure. First temperature
25 ° C., put hot water 80 ° C. in the processing bath of the state of the initial pressure 0kg / cm ^2, 85 ℃ in 1 minute, increasing the temperature and pressure 0.2 kg / cm ^2, further, 121 ° C. in 23 minutes, The temperature and pressure were increased to 1.3 kg / cm ² . Subsequently, the pressure was gradually increased to 2.1 kg / cm ² while maintaining the temperature at 121 ° C. for 20 minutes, and the temperature and pressure were maintained as they were for 5 minutes. After that, the pressure was set to 2.1 kg / cm ² for 6 seconds after the cooling water was started to enter the processing tank.
, And then the temperature and pressure were lowered to 50 ° C. and 0.1 kg / cm ^{2 in} 10 minutes. Thereafter, the temperature and pressure were slowly lowered until the pressure and temperature became 25 ° C. and 0 kg / cm ² in 20 minutes, and the pressure heating treatment was completed. According to this processing condition, 20% of container capacity, 40%
%, A container filled with corn soup of 60%
Deformation was observed in a total of four containers, which were filled with 20% rice with air.

Comparative Example 2 The following describes an example in which processing conditions are adopted in which a container filled with a content that has the fastest temperature change during heating and cooling does not deform.

Six samples similar to those used in the examples were prepared.

The six samples described above were placed in a processing tank, and the temperature and pressure were adjusted as shown in FIG. Note that all pressures are indicated by gauge pressure. First temperature
25 ° C., put hot water 80 ° C. in the processing tank in the state of initial pressure 0kg / cm ^2, 85 ℃ in 1 minute, increasing the temperature and pressure 0.2 kg / cm ^2, further, 121 ° C. in 19 minutes The temperature and pressure were increased to 1.8 kg / cm ² . Subsequently, the pressure was gradually increased to 2.1 kg / cm ² while maintaining the temperature at 121 ° C. for 5 minutes.
The temperature and pressure were kept as they were for 20 minutes. After that, the pressure is 2.1kg / cm for 6 seconds after the cooling water is started to enter into the processing tank.
² and then the temperature and pressure were reduced to 70 ° C., 0.1 kg / cm ^{2 in} 5 minutes. Thereafter, the temperature and pressure were slowly lowered until the temperature and pressure reached 25 ° C. and 0 kg / cm ² in 20 minutes, and the pressure heating treatment was completed. According to this processing condition, 40%, 60% of container capacity
Deformation was observed in a total of two containers that were filled with the rice.

Comparative Example 3 An example in which processing conditions in which a container filled with contents with the fastest temperature change does not deform during heating does not deform, and processing conditions in which a container filled with contents containing the slowest temperature change changes the temperature during cooling do not deform. Is shown below.

Six samples similar to those used in the examples were prepared.

The six samples described above were placed in a processing tank, and the temperature and pressure were adjusted as shown in FIG. Note that all pressures are indicated by gauge pressure. First temperature
25 ° C., put hot water 80 ° C. in the processing bath of the state of the initial pressure 0kg / cm ^2, 85 ℃ in 1 minute, increasing the temperature and pressure 0.2 kg / cm ^2, further, 121 ° C. in 19 minutes, The temperature and pressure were increased to 1.8 kg / cm ² . Subsequently, the pressure was gradually increased to 2.1 kg / cm ² while maintaining the temperature at 121 ° C. for 5 minutes, and the temperature and pressure were maintained as they were for 20 minutes. After that, the pressure was set to 2.1 kg / cm ² for 6 seconds after the cooling water was started to enter the processing tank.
, And then the temperature and pressure were lowered to 50 ° C. and 0.1 kg / cm ^{2 in} 10 minutes. Thereafter, the temperature and pressure were slowly lowered until the temperature and pressure reached 25 ° C. and 0 kg / cm ² in 20 minutes, and the pressure heating treatment was completed. Under these conditions, deformation of all containers was observed.

(Effects of the Invention) According to the present invention, two or more containers formed of a flexible material such as a plastic material, a paper material, an aluminum material, etc. are filled with different contents respectively, then sealed and simultaneously sealed. During the pressurization and heat treatment, deformation of all containers can be prevented.

[Brief description of the drawings]

FIG. 1 relates to the processing method of the present invention, and shows a graph of processing conditions when an object to be processed is subjected to pressure and heat treatment. The horizontal axis represents time (minutes), and the left vertical axis represents time. Temperature (℃),
The right vertical axis shows the pressure (kg / cm ² ). FIG. 2 shows a change in the internal pressure and a slow change in the temperature of the container (a) filled with the contents that have a rapid change in temperature from the start of processing (at the time of heating) to the end of processing (at the time of cooling). This figure shows a change in internal pressure of a container (b) filled with air. FIGS. 3 to 5 show comparative examples, and FIG. 3 shows processing conditions under which the container filled with the contents containing the slowest temperature change during heating and cooling does not deform. FIG. 4 shows the processing conditions under which the container filled with the contents containing the fastest temperature change during heating and cooling does not deform. FIG. 5 shows processing conditions under which the container filled with the contents with the fastest temperature change does not deform when heated, and processing conditions under which the container filled with the contents with the slowest temperature change does not deform during cooling. It is a thing.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Koichi Inoue 1-5-7 Mitsuki Sakaemachi, Higashiosaka-shi, Osaka House Foods Industry Co., Ltd. (72) Inventor Mari Sasai 1-5-5 Mitsukie-cho, Higashiosaka-shi, Osaka No. 7 House Food Industry Co., Ltd. (56) References JP-A-62-224269 (JP, A)

Claims (2)

(57) [Claims] 1. A method for compressing and heating two or more containers made of a flexible material, each of which is filled with different contents, and then simultaneously pressurizing and heating in a treatment tank under the same conditions. If the internal pressure resistance> external pressure resistance, heat treatment is performed by increasing the internal pressure of the treatment tank at a pressure increase rate that does not deform the container filled with the contents with the slowest temperature change and then the contents with the fastest temperature change A method for simultaneously processing different kinds of contents, wherein the internal pressure of the processing tank is lowered at a pressure drop rate at which the container filled with air does not deform. 2. When two or more containers made of a flexible material are filled with different contents in a gas-filled manner, sealed, and simultaneously subjected to pressure and heat treatment in a treatment tank under the same conditions, the characteristics of all the containers are obtained. If the internal pressure is less than the external pressure, the container with the fastest temperature change will not be deformed. A method for simultaneously processing different kinds of contents, wherein the internal pressure of the processing tank is lowered at a pressure drop rate at which the container filled with air does not deform.