JP2021011304A - Manufacture method of gas-containing food - Google Patents

Abstract

To provide a manufacture method for obtaining a food in which gas is dissolved while performing ultrasonic welding.SOLUTION: A container body 16 containing a gas-permeable inner container 14 in an outer container 13, a lid body 15 having no valve, which is made of the same material as the container body 16 and closes the opening of the container body 16, a food C having a dissolution amount of gas of 0.05 or less, and gas P for dissolving the food are provided. After filling one of the inner container 14 or the outer container 13 and the inner container 14 with food C and filling the other with gas P, the lid body 15 is ultrasonically welded to the container body 16, the outer container 13 and the inner container 14 are sealed, and the gas P is permeated and contained in the food C.SELECTED DRAWING: Figure 5

Description

The present invention relates to a method for producing a gas-containing food, and particularly to a method for producing a gas-containing food when the food is sealed by ultrasonic welding.

In closing the opening of the container containing the inner bottle in the outer bottle, ultrasonic welding of the lid to the container has been conventionally performed as described in, for example, Patent Document 1.

Japanese Unexamined Patent Publication No. 2019-006457

In recent years, in order to reduce the environmental load, packaging containers that are easy to recycle have been required. One method is to use a single material for the packaging container, but since the discharge container of Patent Document 1 is provided with a valve, the sealing material cannot be omitted. Therefore, it is conceivable to weld an openable lid to a container body made of the same material and seal it, and attach a discharge member with a valve. However, foods (carbonated beverages, etc.) in which gas is saturated and dissolved in a low temperature state are used. When an attempt is made to ultrasonically weld the lid while the container is filled, the gas dissolved in the food is rapidly vaporized by ultrasonic vibration and foams out. Therefore, the welded portion is cooled by the foamed food, and it becomes difficult to weld the lid to the container. Further, even if welding is possible, there is a problem that the gas content in the food is reduced.

Therefore, an object of the present invention is to provide a production method for obtaining a food in which gas is dissolved while ultrasonically welding.

The method for producing a gas-containing food of the present invention comprises a container body 16 containing a gas-permeable inner container 14 in an outer container 13 and the same material as the container body 16, and closes the opening of the container body 16. The inner container 14 or the outer container 13 and the inner container 14 are provided with a lid 15 having no valve, a food C having a gas dissolution amount of 0.05 or less, and a food dissolution gas P. After filling one of the spaces with the food C and filling the other with the gas P, the lid 15 is ultrasonically welded to the container body 16 to form the outer container 13 and the inner container 14. It is characterized in that it is sealed and the gas P is permeated and contained in the food C.

In the above manufacturing method, it is preferable that the food C is filled in the inner container 14 and the gas P is filled between the outer container 13 and the inner container 14. Further, it is preferable to replace the gas in the inner container 14 with the gas P after filling the inner container 14 with the food C. Further, it is preferable that the gas P is a compressed gas having a solubility in water at 25 ° C. of 0.05 or more.

In the method for producing a gas-containing food of the present invention, since the food in which the dissolved amount of gas is 0.05 or less is filled, the gas is hardly vaporized from the food when the lid is ultrasonically welded to the container body. , Can be reliably welded. Further, since the gas permeates the inner container and dissolves in the food, the food in which the gas is dissolved can be obtained. Since the container body and lid are made of the same material, it is easy to recycle after discharging food.

When the inner container is filled with food and gas is filled between the outer container and the inner container, heat from the outside is not easily transferred to the food in the inner container, and when the pre-cooled food is filled in the inner container, the outside The gas between the container and the inner container dissolves quickly and easily. Replacing the gas in the inner container makes it easier to dissolve the gas in the food. If the gas filled between the outer container and the inner container is a compressed gas having a solubility in water at 25 ° C. of 0.05 or more, the amount of gas dissolved in food is large, and the gas dissolved during feeding. The effect of is easy to obtain. Further, even if there is a space (head space) in the inner container immediately after filling the stock solution, the gas permeates the inner container and dissolves in a large amount in the stock solution, and the inner container contracts to eliminate the head space. Therefore, it is possible to prevent the undiluted solution from splashing when the lid is opened. Further, since the pressure is greatly reduced by the dissolution of the gas, the container body can be made thinner.

FIG. 1A is a cross-sectional view showing an embodiment of a discharge device using the gas-containing food obtained by the production method of the present invention, and FIG. 1B is a cross-sectional view before assembling the pressurized container. FIG. 2A is a cross-sectional view of a main part showing an embodiment of a lid welding step according to the present invention, and FIG. 2B is a cross-sectional view after welding. FIG. 3 is an enlarged cross-sectional view of the discharge member of FIG. 1A. It is a partial cross-sectional front view of the pressurizing agent filling device used in the manufacturing method of this invention. It is a schematic process diagram which shows one Embodiment of the manufacturing method of the gas-containing food of this invention.

The discharge device 10 shown in FIG. 1A includes a pressure container (double pressure container) 11, a discharge member 12 mounted on the pressure container 11, and a stock solution (food) C filled in the pressure container 11. It is composed of a pressurizing agent (gas for dissolving food) P. The gas-containing food 11a is a pressure container 11 filled with the stock solution C and the pressure agent P. The gas-containing food 11a and the discharge member 12 are sold as a set before assembly, or in a semi-bonded state in which the discharge member 12 is somewhat screwed into the upper end of the gas-containing food 11a and is unopened. The gas-containing food 11a is sold together with the discharge member 12, and is also sold alone as a replacement. In that case, since the discharge member 12 is used repeatedly, it contributes to resource saving. The discharge member 12 may also be sold independently.

The pressure container 11 shown in FIG. 1B is a lid (sealing panel) for sealing the outer container 13, the flexible inner container 14 housed inside the outer container 13, and the outer container 13 and the inner container 14. ) Consists of 15. It does not have valves or pumps. Further, the outer container 13, the inner container 14, and the lid 15 are made of the same material. Therefore, the pressure vessel 11 is made of a single material. The combination of the outer container 13 and the inner container 14 is the container body 16. The inside of the inner container 14 is a stock solution storage chamber Sc filled with the stock solution C, and the space between the outer container 13 and the inner container 14 is a pressure agent storage chamber Sp filled with the pressurizing agent P (see FIG. 1A). .. They are sealed by the lid 15, but in the state of FIG. 1B, neither the stock solution C nor the pressurizing agent P is filled, and neither the lid 15 is welded. In this embodiment, the undiluted solution C and the pressurizing agent P are separately contained in the inner container 14, and the undiluted solution C can be discharged by attaching the discharge member 12.

FIG. 1B shows the state before the lid 15 is put on the container body 16. The outer container 13 includes a bottom portion 13a, a cylindrical body portion 13b, a shoulder portion 13c, and a cylindrical neck portion 13d. A male screw 13e is formed on the outer circumference of the neck portion 13d. The neck portion 13d is open at the upper end, and the upper end surface 13f of the neck portion 13d stably supports the lid body 15 and is substantially flat so that it can be welded.

Like the outer container 13, the inner container 14 also includes a bottom portion 14a, a body portion 14b, a shoulder portion 14c, and a neck portion 14d. The vicinity of the upper end of the neck portion 14d is the mouth portion. The outer surface of the neck portion 14d of the inner container 14 is fitted so as to have a slight gap with the inner surface of the neck portion 13d of the outer container 13. The bottom portion 14a of the inner container 14 is in contact with the bottom portion 13a of the outer container 13, and is supported so that the inner container 14 does not lower when the pressurizing agent P is filled or when the lid 15 is fixed.

FIG. 2A shows a state in which the container body 16 is covered with the lid body 15. A horn H worn by ultrasonic welding is in contact with the top surface 17c of the lid 15. Welding of the lid 15 has not been performed yet. At this time, the stock solution C is filled in the stock solution storage chamber Sc, but the pressure agent P is not filled in the pressure agent storage chamber Sp. On the upper end surface 13f of the neck portion 13d of the outer container 13, the contact pressure with the lid body 15 is increased during ultrasonic welding to facilitate dissolution, and a welding portion for integrating with the lid body 15 (FIG. 2B). 13 g of annular protrusions forming Y2) of the above are formed. The annular protrusion 13g has a substantially triangular cross section, and is particularly an isosceles triangle or an equilateral triangle.

In this embodiment, the annular protrusion 13g is provided substantially in the center of the thickness range of the neck portion 13d. An annular protrusion may be provided on the lid 15 side, and the upper end surface 13f of the neck portion 13d may be flat. A plurality of inclined portions 13h are provided on the inner side of the upper end surface 13f, and a space for accommodating resin pieces (welding debris) formed by cooling the resin melted during ultrasonic welding so as not to protrude. It is said.

As shown in FIG. 2A, the upper portion of the neck portion 14d of the inner container 14 protrudes from the upper end surface 13f of the outer container 13, and a flange 14f that engages with the upper end surface 13f of the outer container 13 is formed at the protruding portion. ing. The thickness (radial dimension) of the flange 14f is about 1/3 to 1/2 of the thickness of the neck portion 13d of the outer container 13. Therefore, when the flange 14f is locked to the upper end surface 13f of the neck portion 13d of the outer container 13, the upper end surface 13f of the neck portion 13d of the outer container 13 remains without covering the outer portion. The annular protrusion 13g at the upper end of the outer container 13 is provided on the outer portion thereof. An annular protrusion on the upper end surface 14e of the neck portion 14d of the inner container 14 for forming a welded portion (Y1 in FIG. 2B) with the lid body 15 by increasing the contact pressure with the lid body 15 at the time of ultrasonic welding. 14 g is formed. In this embodiment, the annular protrusion 14g is also a substantially triangular cross section, particularly an isosceles triangle or an equilateral triangle.

On the lower surface of the flange 14f of the inner container 14, lateral grooves 14h for filling the pressurizing agent extending in the radial direction are formed at four positions at equal intervals. Further, a vertical groove 14i communicating with the lateral groove 14h is formed on the outer peripheral surface of the neck portion 14d of the inner container 14. The vertical groove 14i extends from the lateral groove 14h to the upper end of the shoulder portion 14c, whereby the pressurizing agent P can be easily filled in the pressurizing agent accommodating chamber Sp.

Both the outer container 13 and the inner container 14 are made of a synthetic resin, particularly a thermoplastic resin such as polyethylene terephthalate, polyethylene naphthalate, polyethylene, and polypropylene. These can be manufactured, for example, by putting the preform for the inner container in the preform for the outer container and blow molding the lower side of the neck portions 13d and 14d at the same time. In particular, an injection blow molding method in which a preform having a predetermined shape is injection molded and then blow molded is preferable.
The inner container 14 is blow-molded to reduce the wall thickness of the body portion 14b to 0.05 to 0.3 mm so that the pressurizing agent P can easily permeate. On the other hand, the outer container 13 is blow-molded to increase the wall thickness of the body 13b to 0.35 mm or more so that the outer container 13 has a strength that does not significantly deform even under the pressure immediately after filling (the state before the pressurizing agent P is dissolved in the stock solution C). can get. As described above, it is preferable that the wall thickness of the body portion 13b of the outer container 13 is thicker than the wall thickness of the body portion 14b of the inner container 14.

The lid 15 is composed of a bottomed tubular sealing portion 15a inserted into the neck portion 14d of the inner container 14 and an annular flange 15b continuous with the upper end thereof. The upper portion of the sealing portion 15a is an inner cylinder portion 15a1 that fits with the inner surface of the neck portion 14d of the inner container 14 with a gap, and the lower portion accommodates the valve 21 of the discharge member 12 in a detachable manner and is a sealing material (reference numeral in FIG. 1). It is a valve accommodating portion (fitting cylinder portion) 15a2 that is fitted via 28). The valve accommodating portion 15a2 has a smaller diameter than the inner cylinder portion 15a1.

The flange 15b of the lid 15 includes a flat plate portion 17 extending outward in the radial direction from the upper end of the sealing portion 15a, and an outer cylinder portion 17a extending downward from the outer edge of the flat plate portion 17. The lower surface 17b of the flat plate portion 17 is a portion that abuts on the upper end surface 14e of the neck portion 14d of the inner container 14, particularly the annular protrusion 14g, to form a welded portion (reference numeral Y1 in FIG. 2B) and seal the lower surface 17a1 of the outer cylinder portion 17a. Is a portion that abuts on the upper end surface 13f of the neck portion 13d of the outer container 13, particularly the annular protrusion 13g, to form a welded portion (reference numeral Y2 in FIG. 2B) and seal it. The welded portion Y1 of the inner container 14 seals between the stock solution accommodating chamber Sc and the pressurizing agent accommodating chamber Sp. The welded portion Y2 of the outer container 13 seals between the pressurizing agent accommodating portion Sp and the outside. The top surface 17c (top surface of the flange 15b) of the flat plate portion 17 is a contact surface with the horn H that oscillates the ultrasonic vibration of the ultrasonic welding machine. The horn H is cylindrical and the lower surface H1 is flat. The diameter D of the lower surface H1 is equal to the diameter of the annular protrusion 13g.

For ultrasonic welding of the lid body 15, the stock solution C is filled in the stock solution storage chamber Sc in the inner container 14, the opening of the container body 16 is covered with the lid body 15, and then a pressurizing agent incorporating a horn H for welding. This can be done by a filling device (see reference numeral 30 in FIG. 4). Ultrasonic welding is performed after the pressure agent P is undercup-filled in the pressure agent storage chamber Sp between the outer container 13 and the inner container 14 in FIG. 2A.

After welding, as shown in FIG. 2B, the lower surface 17a1 of the outer cylinder portion 17a is welded to the upper end surface 13f of the outer container 13, and the lower surface 17b of the flat plate portion 17 is welded to the upper end surface 14e of the inner container 14. The pressure agent P permeates the inner container 14, and the pressure agent P is dissolved in the stock solution C to form a gas-containing food 11a. In order to dissolve the required amount of the pressurizing agent P in the stock solution C, for example, it may be stored (refrigerated) for 3 hours or more in an atmosphere of 5 ° C. (refrigerator, warehouse, transportation container, etc.). However, it does not necessarily have to be refrigerated. Then, as described above, the molten resin does not protrude to the outside through the gap between the two. Further, since the two welded portions Y1 and Y2 are continuously and sufficiently welded, the pressurizing agent P does not leak from the pressurizing agent accommodating chamber Sp for a long period of time, and the undiluted solution C is used as the undiluted solution accommodating chamber Sc. Does not leak from. The resin that protrudes inward during welding is stored in the inclined portion (inclined groove) 13h and does not flow into the pressurizing agent accommodating chamber Sp.

The bottom portion of the sealing portion 15a, that is, the bottom portion 15c of the valve accommodating portion 15a2 is provided with an opened portion 15d provided with a pressure receiving portion 15d1 which is thicker than the surroundings. The circumference of the opened portion 15d is surrounded by a weakening line 15f such as an annular groove, except for a part (continuous portion) 15e. The pressure receiving portion 15d1 is provided on the entire upper surface of the opened portion 15d, and the weakening line 15f is formed on the upper surface of the bottom portion 15c so as to surround the circumference of the pressure receiving portion 15d1. The weakening line 15f is composed of, for example, a V groove. The continuous portion 15e of the opened portion 15d is provided with a reinforcing portion (reinforcing rib) 15 g extending outward in the radial direction.

As the material of the lid 15, a thermoplastic resin having high thermal bondability with the outer container 13 and the inner container 14 is used, and the same material as the outer container 13 and the inner container 14 is used. As shown in FIG. 2B, the contents (stock solution C, addition) are formed by sealing the stock solution storage chamber Sc and the pressurizing agent storage chamber Sp with the lid 15 and fixing them to both the inner container 14 and the outer container 13. The pressure agent P) can be safely stored for a long period of time so as not to leak. Since the pressurized container after discharging the undiluted solution is a single material, it is easy to recycle.

When the gas (particularly the gas of headspace Hs described later) G in the inner container 14 is replaced with another gas, a gas having the following relationship with the stock solution C is selected as the replacement gas R. Soluble compressed gas (carbon dioxide, nitrogen phosphite) or soluble compressed gas and low soluble gas (compressed air, oxygen, nitrogen, hydrogen) having higher solubility in 1 ml of undiluted solution at 25 ° C. and 1 atm. ), Which is 0.02 ml or more, and more preferably 0.05 ml or more. If the solubility is high, the substitution gas R, which is the gas G in the inner container 14, is rapidly dissolved in the stock solution C, and the gas phase portion is likely to disappear, so that the pressure of the gas-containing food 11a can be stabilized in a short time.

Examples of the undiluted solution C include soft drinks, alcoholic beverages, desserts, seasonings, dietary supplements, liquid foods such as whip cream, jelly-like foods, and gel-like foods. However, it is not limited to these uses. Air or gas may be dissolved in the stock solution C in advance. However, the amount of gas dissolved shall be 0.05 or less. If the amount of dissolved gas exceeds 0.05, a large amount of gas escapes during ultrasonic welding, which hinders ultrasonic welding. The dissolved amount of gas is the volume (ml) of the gas dissolved in 1 ml of the stock solution.

The undiluted solution C is preferably brought into contact with the inner surface side of the opened portion 15d. As a result, the problem that the opened portion 15d is cooled by the undiluted solution C when the lid body 15 and the container body 16 are welded and the opened portion 15d is melted by heat can be solved.

As the pressurizing agent P, a soluble compressed gas such as carbon dioxide gas (0.76) and nitrous oxide (0.059), and a soluble compressed gas and a low soluble gas (air (0.017), oxygen (0) It is a mixed gas of .028), nitrogen (0.014), and hydrogen (0.018)), and it is preferable to use the gas G in the inner container 14, particularly one having a higher solubility than air. The numbers in parentheses indicate the solubility in water at 25 ° C. Specifically, those having a solubility in 1 ml of the undiluted solution at 25 ° C. and 1 atm of 0.02 ml or more, preferably 0.05 ml or more are used. The pressure of the pressurizing agent P in a saturated dissolved state is 0.2 to 0.6 MPa (25 ° C., gauge pressure), preferably 0.3 to 0.5 MPa (25 ° C., gauge pressure) similar to that of a carbonated drink. It is filled so that it becomes pressure).

The capacity of the outer container 13 is preferably 30 to 500 ml. The capacity of the inner container (stock solution storage chamber Sc) 14 is preferably about 20 to 300 ml. The capacity of the pressurizing agent storage chamber Sp is preferably about 10 to 200 ml.

As described above, the gas-containing food 11a using the pressurized container 11 has a small number of parts and does not have a valve, so that it can be manufactured at low cost and the pressurized container 11 can be made of a single material. Easy to recycle. Further, even if the outer container 13 is cracked when the consumer carries it or the distributor delivers it, the pressurizing agent P only leaks and the undiluted solution C in the inner container 14 does not leak. , Safe. In addition, when a consumer carries it after cooling it in a refrigerator at home, the space between the outer container 13 and the inner container 14 acts as an ice pack and the outside air temperature is not easily transmitted to the food C, so that it is cooled for a long time. It can be taken in a free state.

Next, the discharge member 12 of FIG. 1A will be described with reference to FIG. The discharge member 12 includes a cap (mounting portion) 20 screwed with the male screw 13e of the neck portion 13d of the outer container 13, a valve 21 held by the cap 20, and an operation button (mounted on the stem 22 of the valve 21). It is composed of an operation unit and an actuator) 23. The cap 20 has a bottomed tubular shape, and a female screw is formed on the inner peripheral surface. A valve holder 18 provided with a tubular valve holding portion 18a for holding the upper portion of the housing 24 of the valve 21 is attached to the lower side of the upper bottom 20a.

The valve 21 includes a bottomed tubular housing 24, the above-mentioned stem 22 movably housed inside the housing 24, a spring 25 for urging the stem 22 upward, an upper end of the housing 24, and a valve holder 18. It has a known basic structure including a stem rubber 26 interposed between the rubber retainers 18b. Further, in this embodiment, a substantially columnar opening portion 27 projecting downward is provided at the lower end of the housing 24. The opening portion 27 is a portion for breaking and opening the opened portion 15d (see FIG. 2B) provided at the lower part of the lid body 15. A sealing member 28 such as an O-ring is attached to the lower outer periphery of the housing 24.

The sealing member 28 seals between the inner peripheral surface of the valve accommodating portion 15a2 of the lid 15 and the housing 24 at the time of opening and after opening. The passage connecting the inside of the housing 24 and the stock solution accommodating chamber Sc in the inner container 14 is a vertical hole 24a penetrating the housing 24 up and down.

The position of the bottom surface 27a of the opening portion 27 in the height direction is a position where the cap 20 comes into contact with the pressure receiving portion 15d1 (see FIG. 2B) when the cap 20 is screwed into the male screw of the outer container 13 about once or twice. Therefore, at the time of shipment and distribution, the cap 20 can be loosely screwed so that the opened portion 15d is not broken, and the discharge member 12 and the pressure container 11 can be temporarily connected in the sealed state. Therefore, the purchased consumer can easily open the cap 20 by simply turning the cap 20 several times and screwing it in.

When using the discharge device 10 purchased by the user, first, the cap 20 is screwed into the male screw 13e of the outer container 13. As a result, the entire cap 20 and the valve 21 are lowered, and the bottom surface 27a of the opening portion 27 pushes down the opened portion 15d. As a result, the opened portion 15d is broken at the weakening line 15f, penetrates the bottom portion 15c of the valve accommodating portion 15a2, and communicates the inside of the housing 24 with the undiluted solution accommodating chamber Sc. After that, by pressing the operation button 23, the undiluted solution C can be discharged by the pressure of the pressurizing agent P.

When the undiluted solution C runs out, the cap 20 is turned in the reverse direction to remove the discharge member 12 from the gas-containing food 11a. Since the pressurized container 11 in which the undiluted solution C is emptied is made of a single material, it is easy to recycle. Further, since the inner container 13 is thin, the pressurizing agent P easily permeates because the stock solution C is exhausted, and the pressurizing agent P is gradually discharged to the outside from the opened portion 15d to be opened. Further, the discharge member 12 can be used hygienically and repeatedly by replacing the valve 21 and the operation button 23 that come into contact with the stock solution C.

Next, an example of the pressurizing agent filling device used for filling and welding the pressurizing agent P described above will be described with reference to FIG. The pressurizing agent filling device 30 of FIG. 4 has a base 31, an elevating table 32 provided on the base 31, a tubular filler 33 arranged above the elevating table 32, and an upper portion of the filler 33. It is composed of a horn H for ultrasonic welding, which is provided in the filler 33 so as to be able to move up and down with the opening closed. The filler 33 is height-adjustably supported by two columns 35 rising from the base 31. A sealing material 36 is provided at the lower end of the filler 33 and airtightly contacts the shoulder portion 13c of the outer container 13. The horn H is attached to the ultrasonic oscillator via an elevating mechanism including a drive source such as a fluid cylinder or a motor. The elevating table 32 is also supported by the elevating device 37 so that the height can be adjusted.

As described above, the horn H has a central portion Hm adjusted to the inner diameter of the filler 33 so that it can slide up and down while sealing the inside of the filler 33. Further, the horn H is reduced in diameter from the upper Hu to the middle Hm and further reduced in diameter from the middle Hm to the lower Hb so that the vibration energy can be amplified downward from the ultrasonic oscillator. Therefore, the diameter near the lower end 38 is the smallest.

The method for producing the gas-containing food 11a shown in FIG. 5 includes a stock solution filling step S1, a replacement step S2 for converting the gas G in the inner container 14 into a replacement gas R, and a lid for which the lid 15 is attached to confine the replacement gas R. The body mounting step S3, the pressurizing agent filling / lid welding step S4, and the internal container shrinking step S5 are provided. However, the replacement step S2 does not necessarily have to be performed. In this manufacturing method, first, a container body 16 in which the inner container 14 is mounted on the outer container 13 is prepared. The double container body 16 can be manufactured by double blow molding or the like. Then, the inner container 14 is filled with the undiluted solution (food in which gas is not dissolved) C in which the gas is not intentionally dissolved. The stock solution C may be depressurized in advance to degas saturated and dissolved air to reduce the amount of dissolution. Further, the stock solution C is preferably cooled to 5 ° C. or lower in advance. At the time of this stock solution filling step S1, an empty space (head space) Hs that is not filled with the stock solution C is left in the upper part of the inner container 14.

In the next replacement step S2, the lid 15 is held in a state where gas can enter and exit the stock solution storage chamber Sc, and the replacement gas having high solubility in the stock solution C through the gap between the opening of the inner container 14 and the lid 15. R is filled, the air in the head space Hs in the inner container 14 is discharged to the outside, and the gas G in the inner container 14 is changed to the replacement gas R (replacement step). In particular, it is preferable to replace it with the gas to be dissolved in the stock solution C.

Then, in the lid mounting step S3, the lid 15 is placed over the opening of the container body 16 and the replaced gas is confined in the head space Hs. By using a gas having a density (molecular weight) higher than that of air, it is easy to confine it in the headspace Hs.

Following the lid mounting step S3, the pressurizing agent filling chamber Sp between the inner container 14 and the outer container 13 is filled with the pressurizing agent P. The lid 15 is opened in the inner container 14 and the outer container is opened. The lid welding step S4 for welding and fixing to the opening of 13 is performed. In this step, the pressurizing agent P is filled in the pressurizing agent accommodating chamber Sp through the gap between the lid 15 and the outer container 13 (undercup filling). After that, the lid 15 is welded to the outer container 13 and the inner container 14 and sealed. In this step, for example, the pressurizing agent filling device 30 of FIG. 4 can be used, and the welding method of FIG. 2A can be adopted. As a result, welded debris is less likely to come out, the adhesion between the lid 15 and the outer container 13 is increased, leakage is small, and a gas-containing food 11a having an excellent appearance can be obtained.

When the pressurizing agent P has a higher solubility in the stock solution C than the air in the headspace Hs, the pressurizing agent P permeates the inner container 14 and easily dissolves in the stock solution C, so that the replacement step S2 is performed. Not needed.

Further, when the pressurizing agent P is filled, the pressurizing agent P may also be filled in the head space Hs. That is, even in this step, the air in the head space Hs and the pressurizing agent P can be replaced (replacement step S4a). In this case, the substitution gas R is the pressurizing agent P, and the gas G in the inner container 14 is the pressurizing agent P.

The inner container 14 is heat-shrinked by filling the stock solution C heated in the stock solution filling step S1, or the inner container 14 is heat-shrinked by blowing hot air before the stock solution filling step S1 and then the stock solution C is filled. You can also do it. Further, the air in the inner container 14 may be vacuumed to contract the inner container 14, and the pressurizing agent storage chamber Sp between the outer container 13 and the inner container 14 may be filled with a pressurizing agent or compressed air inside. The container 14 may be pressurized and contracted from the outside. When the inner container 14 and the outer container 13 are manufactured by double blow molding or the like, the inner container 14 and the outer container 13 are in close contact with each other, and the pressurizing agent storage chamber Sp is small and difficult to fill. By shrinking the internal container 14 to form the pressurizing agent accommodating chamber Sp before filling the pressurizing agent P in this way, the pressurizing agent P can be easily filled. In addition, the inner container 14 tends to shrink due to the dissolution of the gas described later.

When the lid welding step S4 is completed, the pressure inside the container body 16 increases, so that the gas G in the headspace Hs is compressed and further dissolved in the stock solution C. Alternatively, the pressurizing agent P in the pressurizing agent accommodating chamber Sp permeates into the inner container 14 and dissolves in the stock solution C, so that the air (gas) G in the headspace Hs that could not be completely dissolved is removed from the inner container 14. It is extruded and the gas phase part becomes smaller or disappears. Therefore, the inner container 14 gradually shrinks. This is the internal container shrinkage step S5. The internal container shrinkage step S5 is preferably performed in a refrigerated state.

As described above, according to the method for producing the gas-containing food 11a of the present invention, the gas G in the inner container 14 can be dissolved in the stock solution C or pushed out of the inner container 14, so that the gas G in the inner container 14 can be pushed out. The formation of the gas phase part can be suppressed. In particular, when the lid 15 is ultrasonically welded, if the undiluted solution C is present near the welded portion, the undiluted solution C may be atomized by ultrasonic vibration to inhibit the dissolution of the welded portion, resulting in insufficient welding. Therefore, it is necessary to provide a gas phase portion in the inner container 14 and separate the liquid level of the undiluted solution C from the welded portion, and the gas phase portion is inevitably generated in the inner container 14, but by providing the inner container shrinking step S5, , The gas phase part can be made small or extinguished, and stable discharge of the undiluted solution C can be realized.

Further, if carbon dioxide gas is used as the pressurizing agent P, carbon dioxide gas can be dissolved in the undiluted solution C, and foods containing carbon dioxide gas (carbonated water, carbonated drinks, etc.) can be produced.

(Example 1)
A pressurized container 11 made of polyethylene terephthalate (full injection amount of 250 ml of the outer container) was used for both the outer container and the inner container, and the stock solution C was adjusted to 25 ° C. in the inner container, and water in which air was saturated and dissolved (dissolved). Amount 0.017) was filled in 150 g. Next, the container body was covered with a lid made of polyethylene terephthalate. Further, carbon dioxide gas (solubility in water: 0.76 (25 ° C., 1 atm)) is filled as the pressurizing agent P from between the outer container and the lid to fill the pressurizing agent storage chamber Sp, and the lid is placed in the container body. It was fixed by ultrasonic welding. The gas G in the headspace Hs in the inner container is air. The pressure immediately after production was 0.55 MPa. Then, when it was stored in a refrigerator at 5 ° C., the internal container contracted after 6 hours, the gas phase part almost disappeared, and the pressure dropped to 0.4 MPa. Therefore, in the first embodiment, the replacement steps S2 and S4a are unnecessary. When the finished gas-containing food 11a is opened using the discharge member 12 and the undiluted solution C is discharged, the same stimulus as that of a commercially available carbonated beverage filled in a PET bottle is obtained, and a sufficient amount of the undiluted solution C is obtained. It was found that the pressurizing agent P of was dissolved. Further, when the discharge member was removed after almost all of the undiluted solution C was discharged and the mixture was allowed to stand at room temperature for 3 days, the pressure agent in the pressure agent storage chamber Sp permeated the inner container and further to the outside through the opened portion. It was released and could be easily deformed by grasping the container body.

(Comparative Example 1)
A pressurized container 11 made of polyethylene terephthalate (full injection amount of 250 ml of the outer container) was used for both the outer container and the inner container, and the stock solution C was adjusted to 25 ° C. in the inner container, and carbonated water in which carbon dioxide gas was saturated and dissolved was dissolved. (Dissolved amount 0.76) was filled with 150 g. Next, the container body was covered with a lid made of polyethylene terephthalate. Further, when carbon dioxide gas was filled as the pressurizing agent P from between the outer container and the lid body and the lid body was ultrasonically welded to the container body, the carbonated water overflowed and could not be welded. ..

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made within the scope of the invention. For example, the gas-containing food 11a may be produced not in the air but in an atmosphere that is desired to be dissolved in the stock solution C such as carbon dioxide. In this case, the replacement steps S2 and S4a are unnecessary. Further, the inner container 14 may be filled with the pressurizing agent P, and the stock solution C may be filled between the outer container 13 and the inner container 14. Even in this case, since the pressurizing agent P that has passed through the inner container 14 dissolves in the stock solution C, a gas-containing food can be obtained. In addition to opening the lid 15 with the discharge member 12, a knob portion continuous with the opened portion 15d is provided, and the knob portion is picked up and pulled like a pull top to tear off the opened portion 15d. It may be.

10 Discharge device 11 Pressurized container 11a Gas-containing food 12 Discharge member C Undiluted solution P Pressurizing agent 13 External container 13a Bottom 13b Body 13c Shoulder 13d Neck 13e Male screw 13f Top surface of neck 13g Circular protrusion 13h Inclined portion 14 Internal container Sc Undiluted solution storage chamber Sp Pressurizer storage chamber 14a Bottom 14b Body 14c Shoulder 14d Neck 14e Top surface 14f Flange 14g Circular protrusion 14h Horizontal groove 14i Vertical groove 15 Lid 15a Sealing part 15a1 Inner cylinder part 15a2 Valve housing part (fitting) Cylinder)
15b Flange 15c Bottom 15d Opened part 15d1 Pressure receiving part 15e Continuous part 15f Weakening line 15g Reinforcing part (reinforcing rib)
16 Container body 17 Flat plate 17a Outer cylinder 17a1 Lower surface of outer cylinder 17b Lower surface of flat plate 17c Top surface of flat plate 18 Valve holder 18a Valve holding 18b Rubber retainer 20 Cap (mounting part)
20a Upper bottom 21 Valve 22 Stem 23 Operation button 24 Housing 25 Spring 26 Stem rubber 27 Opening part 27a (Opening part) Bottom surface 27b Deep hole 27c Side hole 28 Sealing member H Horn H1 Horn bottom surface 30 Pressurizer filling device 31 Base 32 Lifting platform 33 Filling tool 35 Support 36 Sealing material 37 Lifting device 38 Near the lower end of the horn Hu Near the lower end of the horn Hm Upper part of the horn Hb Lower part of the horn S1 Stock solution filling process S2 Replacement process S3 Lid mounting process S4 Pressurizer filling / lid Body welding step S4a Substitution step S5 Inner container shrinkage step Hs Headspace G Gas in inner container R Substitute gas

Claims (4)

A container body containing a gas-permeable inner container inside the outer container,
A lid that is made of the same material as the container body, closes the opening of the container body, and does not have a valve.
Foods with a dissolved amount of gas of 0.05 or less and
Prepare with gas for food dissolution,
After filling either one of the inner container or between the outer container and the inner container with the food and filling the other with the gas, the lid is ultrasonically welded to the container body to the outer container. A method for producing a gas-containing food, wherein the inner container is sealed and the gas is permeated and contained in the food. The method for producing a gas-containing food according to claim 1, wherein the inner container is filled with the food, and the gas is filled between the outer container and the inner container. The method for producing a gas-containing food according to claim 2, wherein the gas in the inner container is replaced with the gas after the food is filled in the inner container. The method for producing a gas-containing food according to any one of claims 1 to 3, wherein the gas is a compressed gas having a solubility in water at 25 ° C. of 0.05 or more.

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