JPS6355022A - Vacuum packaging method - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for vacuum packaging liquid-containing products without boiling the liquid into a flexible packaging bag.

(Prior art) The targets of vacuum packaging are mainly foods, such as pickled vegetables and side dishes.When vacuum packaging these products, the liquid used to preserve the flavor must be vacuum packed together. Must be.

The boiling point of a liquid is determined by the relationship between temperature and air pressure, so delicate control of vacuum pressure is difficult, and if you try to increase the vacuum value as much as possible, the liquid will tend to boil, and in some cases, the liquid may overflow outside the bag. Therefore, it is difficult to give a complete vacuum to the product.

Therefore, the applicant first calculated the vacuum value at which the liquid boils by measuring the temperature of a liquid-containing product in a packaging bag placed inside a pressure-resistant container and the vacuum pressure acting inside the pressure-resistant container, respectively. And the vacuum pressure is liquid boiling! (See Japanese Patent Application No. 105663/1982) for inventing a method of sealing the mouth of the packaging bag just before it reaches aiFi.

(Problems to be solved by the invention, etc.) However, there are temperature differences between each part of a liquid product filled in a packaging bag (especially for liquid products that have just been boiled, there is a large temperature difference between the surface and the inside). It is difficult to detect an accurate average value, and therefore, in the above-mentioned conventional invention, the vacuum pressure is inevitably controlled more conservatively than the maximum allowable limit, which has the disadvantage that the vacuum becomes too weak for the product.

SUMMARY OF THE INVENTION The present invention addresses the above points and aims to provide a method for vacuum packaging a liquid-containing product or the liquid itself without applying too much vacuum to the product and without causing the liquid to leak out of the packaging bag. It is something to do.

(Means for Solving the Problems) In order to achieve the above object, the present invention is a means for gradually reducing the pressure in an airtight pressure container containing a packaging bag filled with a liquid product to a vacuum value. Then, in the pressure-resistant container, a sound-absorbing element is directly brought into close contact with a packaging bag, and a sound-wave transmission line connected at one end to the sound-absorbing element is led out of the pressure-resistant container, and the sound generated inside the bag is transmitted through the sound-wave transmission line. a boiling III sound detection means for detecting boiling sound, a bag mouth sealing means formed by connecting a seal bar arranged along the mouth edge of the packaging bag to a piston power generating element, and a bag mouth sealing means for storing various boiling sounds. a control device having a function of comparing the sound and an input sound from the outside, and when the sound detected by the boiling sound detection means matches the sound set in the memory in the control device, the control device causes the bag mouth to be sealed. The present invention is characterized in that an activation signal is sent to a piston power generating element of the means, and activation of the piston power generating element causes a seal bar to approach the rim of the bag, thereby sealing the rim of the bag.

(Example) The pressure container (50) shown in FIG.
o) It is formed by (ii). − side fixing member (
10) is fixed to the machine base (13) via a cylindrical arm (12) connected to its back, and an endless sealing material (14) is provided on the front edge of the machine as shown in FIG. It is designed to be airtight with the movable member (11) on the other side. Further, the other end of a hose (15) whose one end is connected to the fixed member (10) is connected to a vacuum pump (17) via an electromagnetic switching valve (16), and the electromagnetic section (18) of the electromagnetic switching valve and a switch (19) provided on the lip of the fixed member, and an electric circuit (20).
are connected via. Further, the fixing member (10) is provided with a pair of clamps (21) (21) that support both side edges of the packaging bag (A) inside the pressure container.

Therefore, the movable member (11) is freely displaceable with respect to the fixed member (10), and the movable member (11) has an endless sealing material (
14) in airtight contact with the movable member (10),
Since the switch (19) is closed and the electromagnetic switching valve (16) is switched to connect the pressure vessel (50) and the vacuum pump (17), the pressure inside the pressure vessel (50) begins to gradually decrease. When the preset time set on the timer (22) (the expected time for the inside of the pressure vessel to reach a vacuum) is reached, the electromagnetic switching valve (16) is switched to the normal position and air is introduced into the pressure vessel (50). .

On the other hand, a bulging wall (24) is provided on the inner surface of the movable member (11), and the liquid product (B) contained in the bag (8) is compressed between the bulging wall (24) and the fixed member (10). I am trying to do this, but
A window hole (26) is provided in the inner wall (25) of the fixing member (10), and a flexible membrane (27) is provided inside the window hole (26), and a bag is placed on the inner surface of the flexible IPJ (27). (A), a trumpet-shaped sound absorbing element (28) is fixed to the outside of the flexible membrane (27), and a tubular sound wave transmission line (29) has one end connected to the sound absorbing element. The other end is connected to a control device (30) outside the pressure vessel to form boiling 11q sound detection means (31).

When the pressure in the pressure container (50) is reduced by the vacuum pump (17) and approaches vacuum pressure, the liquid product (B) begins to rise in the bag (A). Vibrations occur inside the bag (A) due to boiling of the liquid product and the flexible membrane (27) does not vibrate, so the carrier wave is transmitted to the control device (3) via the line (29).
In addition, the trumpet-shaped sound absorbing element (28)
When the microphone (32) is installed inside the microphone, its electric cord (29a) becomes a sound wave transmission line.

On the other hand, the control device (30) includes a storage element (30a), a central wavy line element (30b), and an input/output signal processing element (30C).
), and has a function of comparing the boiling sound of the liquid product transmitted via the sound wave transmission line (29a) with sound data preset in the storage element (30a),
When it detects that the above two sounds match, the following signal is transmitted.

That is, the other end of the electrical output circuit (33), one end of which is connected to the input/output signal @ processing element (30c), is connected to the electromagnetic on-off valve (34).
), and the discharge line (36) of the compressor (35) equipped with the solenoid on-off valve is connected to the air cylinder (37) fixed to the back of the fixed member (10) to generate piston power. while forming element (40);
A seal bar (38) provided inside the fixing member (10) along the mouth edge of the bag (A) and the air cylinder (37) are connected via a piston rod (39).

When the sound input to the control device (30) by the boiling sound detection means (31) approximately matches the sound stored in the control device (30) after one stroke, the output circuit (33) Since a command signal to open the electromagnetic on-off valve (34) is sent through the air cylinder (37), pressure fluid acts on the air cylinder (37) and the seal bar (38) closes the bag (A) between it and the seal stand (41).
Weld by applying pressure on the rim. And then the timer (2
When the set time of 2) is reached, the pressure container (50) is opened due to the atmospheric pressure acting inside it, and the vacuum packaged product is removed.

When the pressure vessel is closed, Naotoshi hears the sound of the vacuum pump suctioning the air inside the pressure vessel at a steep slope as shown in Figure 3. Since this sound is different in nature from the sound stored in the control device, the control device does not react.

The air suction sound also becomes smaller as the vacuum value increases, but as the vacuum value increases, the liquid gradually begins to boil, and the boiling sound gradually becomes louder. If the point where the liquid is abused from the bag is taken as the point , the opening edge of the bag can be sealed without allowing liquid to be misused from the bag.

Note that the boiling sound of liquid differs slightly depending on the type of liquid (particle size), but by storing various data in the control device (30) and retrieving data corresponding to the type of liquid for comparison, it is possible to determine the type of liquid. It becomes possible to prevent the liquid from being misused from the bag mouth even if the temperature changes.

(Effects) The present invention detects the initial boiling sound of the liquid product in the bag using the boiling sound detection means, and immediately seals the mouth of the bag with the seal bar, regardless of the temperature of the liquid product. , the vacuum pressure can be increased until just before the liquid is abused from the bag, and it is possible to form a packaged product with a high degree of vacuum without allowing the liquid to be abused.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and is an overall partially sectional view, FIG. 2 is an internal front view of a previous pressure-resistant container, and FIG. 3 is an explanatory view of the operation. (10)...fixed member, (11)...movable member,
(16)...Solenoid switching valve, (17)...Vacuum pump, (19)...Switch, (21)...Clamp, (27)...Flexible membrane, (28)...・Sound absorption element. (29)...Sonic wave transmission line, (30)...Control device, (31)...Boiling sound detection means, (33)...
...Output circuit, (34)...Solenoid on-off valve, (35
)...Compressor, (37)...Air cylinder, (38)...Seal bar, (40)...
Piston power generating element, (50)...Pressure vessel, (
A)...Bag, (B)...Liquid product. Patent applicant EX Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] means for gradually reducing the pressure in an airtight pressure container containing a packaging bag filled with a liquid product to a vacuum value; a sound absorbing element being brought into direct contact with the packaging bag within the pressure container; boiling sound detection means for guiding a sound wave transmission line whose one end is connected to the sound absorbing element to the outside of the pressure container and detecting the sound generated inside the bag via the sound wave transmission line; Consisting of a bag mouth sealing means formed by connecting a disposed seal bar to a piston power generating element, and a control device having a function of storing various boiling sounds and comparing the stored sounds with input sounds from the outside, When the sound detected by the boiling sound detection means matches the sound set in the controller, an activation signal is sent from the controller to the piston power generating element of the bag mouth sealing means, and the piston power generating element is activated. A vacuum packaging method characterized in that the seal bar is brought close to the rim of the bag to seal the rim of the bag.