JP7703844B2 - Pressurized packaging - Google Patents

Description

The present invention relates to a pressure package that contains gas-filled spheres while pressurizing them, and a method for manufacturing the pressure package.

Pressurized packages that house spheres filled with a gas such as nitrogen are known. For example, Patent Document 1 discloses a plastic blow-molded container (1) that houses a tennis ball, which is an example of a sphere. The plastic blow-molded container (1) includes a body (11) that houses a tennis ball, and an aluminum lid (2) that is attached to the opening of the body (11). The body (11) is filled with gas so that the internal pressure is, for example, 1 kg/ ^cm2 .

Japanese Patent Application Publication No. 7-256738

However, the above-mentioned plastic blow-molded container (1) has a problem in that it is not easy to fill the inside with gas and pressurize it. In addition, due to the structure, there is a risk that the opening of the body (11) may bend, etc., and gas may escape between the opening of the body (11) and the aluminum lid (2), which causes the internal pressure of the sphere to easily decrease. Furthermore, since the container (1) is rigid, it is difficult to reduce the volume of waste after removing the sphere from the container (1). Furthermore, in order to prevent gas from leaking from inside the container as much as possible, the opening of the body (11) is tightly closed with the aluminum lid (2), which makes it difficult to open the aluminum lid (2) and remove the sphere.

The present invention provides a pressurized packaging body that stores a gas-filled sphere while pressurizing it, comprising a flexible sheet in which a storage space is formed to store the sphere, a communication portion formed in the sheet that connects the storage space to the outside, and a check valve provided in the communication portion, wherein the check valve allows gas to be filled into the storage space through the check valve and prevents the gas filled in the storage space from escaping to the outside.
According to the above-mentioned pressurizing package, the gas can be easily and reliably filled into the storage space via the check valve. In addition, since there is no risk of gas escaping through the check valve or the sheet, or the gas hardly escapes through the check valve or the sheet, the internal pressure of the sphere can be prevented from decreasing. In addition, since the pressurizing package is mainly composed of a flexible sheet, after the sphere is removed from the pressurizing package, it is possible to reduce waste by folding it compactly. In addition, since the pressurizing package can be opened by tearing the sheet, the sphere can be easily removed.

In addition, the check valve may include a main body having a through hole, a plug for opening and closing the through hole, and a flexible member for connecting the main body and the plug, and the plug opens the insertion port when the storage space is filled with gas, and closes the insertion port after the storage space has been filled with gas at a predetermined pressure.
This makes it possible to simply and reliably fill the storage space with gas via the check valve, and also to reliably prevent the gas filled in the storage space from escaping to the outside.

The sheet may be made of a plurality of sheets of a heat-sealable material, and the storage space may be formed by heat sealing the sheets at predetermined sealing portions.
This makes it possible to form a storage space of a desired shape and size, and also to reliably prevent gas filled in the storage space from escaping to the outside through the sheet.

The sheet may include a main body portion and a portion to be separated, and the seal portion may be provided with a notch for separating the main body portion and the portion to be separated.
This allows the pressure package to be easily and reliably opened by simply tearing the sheet starting from the notch provided in the sealed portion.

The sheet may also include a zipper for opening and closing an opening formed by separating the portion to be separated from the main body. With this, the opening can be closed even after the portion to be separated is separated from the main body, so that the sphere can be carried in the main body, improving convenience.

The seal portion may have a contact prevention seal portion that prevents the sphere accommodated in the accommodation space from contacting the check valve. For example, the contact prevention seal portion may be configured to have a width that increases from a side seal portion provided along a side edge of the sheet toward the check valve.
This prevents the sphere from coming into contact with the check valve, and prevents the check valve from being opened accidentally or damaged.

The storage space is preferably pressurized at 25° C. to a pressure in the range of 0.07 MPa or more and 0.2 MPa or less.
This allows the pressure to be increased to a level equal to or higher than the internal pressure of the sphere contained in the containing space, within the range of the sheet's withstand pressure.

The pressurizing package may further include the sphere accommodated in the accommodation space.
This provides the same effects as the above-mentioned pressure package.

In addition, the manufacturing method of the pressurized package according to the present invention is characterized in that it includes the steps of: preparing a pressurized package before pressurization, the pressurized package having a flexible sheet having a storage space formed therein for storing a sphere filled with gas; a communication portion formed in the sheet that connects the storage space to the outside; and a check valve provided in the communication portion for preventing the gas filled in the storage space from escaping to the outside; storing the sphere in the storage space through an opening formed in the pressurized package; closing the opening of the pressurized package; and pressurizing the storage space of the pressurized package to a pressure equal to or greater than the internal pressure of the sphere by filling the storage space of the pressurized package with gas through the check valve.
This makes it possible to manufacture the pressure package simply and reliably.

According to the present invention, gas can be easily and reliably filled into the storage space via the check valve. In addition, since there is no risk of gas escaping through the check valve or sheet, or there is little risk of gas escaping, it is possible to prevent a drop in the internal pressure of the sphere. In addition, since it is mainly composed of a flexible sheet, after removing the sphere from the pressurized packaging, it is possible to reduce waste by folding it compactly. In addition, since the pressurized packaging can be opened by tearing the sheet, the sphere can be easily removed.

FIG. 2 is a perspective view of a pressure package according to the first embodiment. FIG. 2 is a cross-sectional view showing the layer structure of the sheet of FIG. 1 . FIG. 2 is a cross-sectional view of the check valve of FIG. FIG. 4 is a front view of a nozzle inserted into the check valve of FIG. 3 . FIG. 4 is a cross-sectional view of the check valve of FIG. 3 with a nozzle inserted therein; FIG. 2 is a perspective view of the pressure package before closing. FIG. 7 is a perspective view of the pressurizing package of FIG. 6 before it is closed, with a sphere contained therein; 1 is a table showing test conditions and test results of examples and comparative examples of the first embodiment. FIG. 11 is a front view of a pressurizing package according to a second embodiment before it is closed. FIG. 13 is a front view of a first modified example of the pressurizing package of the second embodiment before closing. FIG. 13 is a front view of a second modified example of the pressurizing package of the second embodiment before closing.

First Embodiment
FIG. 1 shows an example of a pressurized package 10 that contains a sphere 100 filled with gas. The sphere 100 is, for example, a hard tennis ball. The type of gas filled in the sphere 100 can be selected arbitrarily. The gas filled in the sphere 100 is, for example, nitrogen or air. The internal pressure of the sphere 100 can be selected arbitrarily. The internal pressure of the sphere 100 is, for example, in the range of 0.07 MPa to 0.08 MPa at 25° C. The number of spheres 100 contained in the pressurized package 10 can be selected arbitrarily. In the example shown in FIG. 1 etc., the number of spheres 100 contained in the pressurized package 10 is two.

The main elements constituting the pressure package 10 are the sheet 20, the seal portion 30, and the check valve 40. The dots in FIG. 1 and other figures represent the seal portion 30. Hereinafter, the left-right direction of the pressure package 10 when viewed from the front is referred to as the standard width direction XA, and the direction perpendicular to the standard width direction XA is referred to as the standard height direction XB.

The sheet 20 includes a first sheet 21 and a second sheet 22. The first sheet 21 and the second sheet 22 are joined by a seal portion 30 so that a storage space 10A for storing the sphere 100 is formed between the sheets 21 and 22. The storage space 10A is filled with any gas so that the gas filled in the sphere 100 does not escape from the sphere 100. The gas filled in the storage space 10A can be selected arbitrarily. In one example, the gas filled in the storage space 10A is nitrogen or air. The pressure of the storage space 10A is set to a range equal to or greater than the internal pressure of the sphere 100. For example, the pressure of the storage space 10A is in the range of 0.07 MPa to 0.2 MPa at 25°C. In one example, the pressure of the storage space 10A is 0.1 MPa.

The first sheet 21 and the second sheet 22 are two sheets that are formed separately. The sheet 20 has a layer structure in which multiple layers are stacked. The layer structure of the sheet 20 can be selected arbitrarily. In a first example, the sheets 21 and 22 have the same layer structure. In a second example, the sheets 21 and 22 have different layer structures. Figure 1 shows a pressure package 10 formed of a sheet 20 having the layer structure of the first example.

Figure 2 shows the cross-sectional structure of each sheet 21, 22 cut along the thickness direction of each sheet 21, 22. Each sheet 21, 22 has an outermost layer 20A, a first adhesive layer 20B, an intermediate layer 20C, a second adhesive layer 20D, and a sealant layer 20E. One example of a method for manufacturing each sheet 21, 22 is dry lamination.

The outermost layer 20A is laminated on the outermost side of the sheet 20, in other words, at the position farthest from the sphere 100. The outermost layer 20A is made of, for example, a material with excellent gas barrier properties. This allows the quality of the sphere 100 to be maintained well over a long period of time. The material constituting the outermost layer 20A is, for example, polyethylene terephthalate on which an inorganic thin film such as aluminum oxide or silicon oxide is vapor-deposited. The gas whose permeation is suppressed by the outermost layer 20A is, for example, oxygen. The thickness of the outermost layer 20A can be selected arbitrarily. The thickness of the outermost layer 20A is, for example, 12 μm.

The first adhesive layer 20B is provided between the outermost layer 20A and the intermediate layer 20C so as to bond the outermost layer 20A and the intermediate layer 20C together. The material constituting the first adhesive layer 20B is, for example, a polyester urethane adhesive. The thickness of the first adhesive layer 20B can be selected arbitrarily. The thickness of the first adhesive layer 20B is, for example, 2 μm.

The intermediate layer 20C is, for example, laminated on the sphere 100 side of the outermost layer 20A. In the following, the sphere 100 side of any layer may be referred to as the inside. The intermediate layer 20C is, for example, made of a material that is excellent for increasing puncture strength. The material that makes up the intermediate layer 20C is, for example, nylon. The thickness of the intermediate layer 20C can be selected arbitrarily. The thickness of the intermediate layer 20C is, for example, 25 μm.

The second adhesive layer 20D is provided between the intermediate layer 20C and the sealant layer 20E so as to bond the intermediate layer 20C and the sealant layer 20E. The material constituting the second adhesive layer 20D is, for example, a polyester urethane adhesive. The thickness of the second adhesive layer 20D can be selected arbitrarily. The thickness of the second adhesive layer 20D is, for example, 2 μm.

The sealant layer 20E is laminated, for example, on the innermost part of the sheet 20, in other words, at the position closest to the sphere 100. The sealant layer 20E is, for example, made of a heat-sealable material. The material constituting the sealant layer 20E is, for example, linear low-density polyethylene. The thickness of the sealant layer 20E can be selected arbitrarily. The thickness of the sealant layer 20E is preferably determined based on the relationship between the difficulty of peeling off the seal portion 30 and the thickness of the sheet 20. A preferred example of the maximum thickness of the sealant layer 20E is 160 μm. When the thickness of the sealant layer 20E is 160 μm or less, the thickness of the sheet 20 does not become too thick. A preferred example of the minimum thickness of the sealant layer 20E is 80 μm. When the thickness of the sealant layer 20E is 80 μm or more, the seal strength of the seal portion 30 can be increased, and even when the pressure of the storage space 10A is high, the seal portion 30 is less likely to peel off. An example of a preferred range for the thickness of the sealant layer 20E is 80 μm or more and 160 μm or less. In one example, the thickness of the sealant layer 20E is 120 μm.

The sealing portion 30 joins the first sheet 21 and the second sheet 22, or joins the first sheet 21 and the second sheet 22 and the check valve 40. The outer shape of the pressurized package 10 when viewed from the front can be selected arbitrarily. In the example shown in FIG. 1, the outer shape of the pressurized package 10 is rectangular. The sheet 20 can be divided into a portion surrounded by the sealing portion 30 (hereinafter referred to as the "inner portion 23") and the sealing portion 30. The storage space 10A is a space surrounded by the inner portion 23 of the first sheet 21 and the inner portion 23 of the second sheet 22, and is closed by the sealing portion 30 and the check valve 40 so as not to communicate with the outside of the pressurized package 10.

The seal portion 30 includes an upper seal portion 31, a lower seal portion 32, a first side seal portion 33, a second side seal portion 34, and a valve seal portion 35. The upper seal portion 31 and the valve seal portion 35 are provided above the inner portion 23 in the standard height direction XB. The lower seal portion 32 closes the opening 50 (see FIG. 6). The lower seal portion 32 is provided below the inner portion 23 in the standard height direction XB. The first side seal portion 33 is provided on the right or left side of the inner portion 23 in the standard width direction XA. The second side seal portion 34 is provided on the left or right side of the inner portion 23 in the standard width direction XA.

The inner edge 31A of the upper seal portion 31, the inner edge 32A of the lower seal portion 32, the inner edge 33A of the first side seal portion 33, the inner edge 34A of the second side seal portion 34, and the inner edge 35A of the valve seal portion 35 define the inner contour of the inner portion 23. The outer edge 31B of the upper seal portion 31, the outer edge 32B of the lower seal portion 32, the outer edge 33B of the first side seal portion 33, the outer edge 34B of the second side seal portion 34, and the outer edge 35B of the valve seal portion 35 define the outer contour of the pressurized package 10.

The width of each of the sealed portions 31-35 can be selected arbitrarily. The width of each of the sealed portions 31-35 is the length between the inner edge 31A-35A and the outer edge 31B-35B on the normal line to the center line of each of the sealed portions 31-35. The center line of each of the sealed portions 31-35 is an imaginary line segment passing between the inner edge 31A-35A and the outer edge 31B-35B. If the width of each of the sealed portions 31-35 varies from portion to portion, for example, the maximum width or the average width of multiple portions of each of the sealed portions 31-35 represents the width of that sealed portion.

The seal strength of the seal portion 30 can be selected arbitrarily. The seal strength of the seal portion 30 is preferably determined based on the relationship between the resistance to peeling of the seal portion 30 and the ease of heat sealing. An example of the maximum seal strength of the seal portion 30 is 130N/15mm. If the seal strength of the seal portion 30 is 80N/15mm or less, the seal portion 30 cannot be formed under standard conditions. An example of the minimum seal strength of the seal portion 30 is 70N/15mm. If the seal strength of the seal portion 30 is 90N/15mm or more, the seal portion 30 is difficult to peel off even when the pressure in the storage space 10A is high. An example of the range that the seal strength of the seal portion 30 can take is 90N/15mm or more to 130N/15mm or less. In one example, the seal strength of the seal portion 30 is 100N/15mm.

The width and height of the pressure package 10 are preferably determined based on, for example, the number of spheres 100 to be contained and the ease of carrying the pressure package 10. The width of the pressure package 10 is the length between the outer edge 33B of the first side seal portion 33 and the outer edge 34B of the second side seal portion 34 on a line perpendicular to the standard height direction XB. When the width of the pressure package 10 varies from part to part, the width of the pressure package 10 is represented, for example, by the maximum width or the average of the widths of multiple parts. In one example, the width of the pressure package 10 is 130 mm. The height of the pressure package 10 is the length between the outer edge 31B of the upper seal portion 31 and the outer edge 32B of the lower seal portion 32 on a line perpendicular to the standard width direction XA. When the height of the pressure package 10 varies from part to part, the height of the pressure package 10 is represented, for example, by the maximum height or the average of the heights of multiple parts. In one example, the height of the pressure package 10 is 200 mm.

The width of the inner part 23 of the pressurized package 10 is preferably determined so that the sphere 100 cannot substantially move in the standard width direction XA of the pressurized package 10 when the pressurized package 10 is being carried. This stabilizes the position of the sphere 100 in the storage space 10A. The width of the inner part 23 of the pressurized package 10 is the length between the inner edge 33A of the first side seal part 33 and the inner edge 34A of the second side seal part 34 on a line perpendicular to the standard height direction XB. When the width of the inner part 23 varies from part to part, the width of the inner part 23 is represented by, for example, the maximum width or the average of the widths of multiple parts. The width of the inner part 23 is, for example, slightly longer than the outer diameter of the sphere 100. In one example, the width of the inner part 23 is 110 mm.

An opening 50 (see FIG. 6) is formed between the lower portion 21A of the first sheet 21 and the lower portion 22A of the second sheet 22 so that the sphere 100 can be inserted into the storage space 10A. In the pressurized package 10 shown in FIG. 1, the opening 50 is closed by the lower seal portion 32. The pressurized package 10 with the opening 50 closed (hereinafter, the "pressurized package 10 after closing") includes a main body portion 11 and a separation portion 12. The main body portion 11 and the separation portion 12 are divided by a notch 60 provided in the seal portion 30. The main body portion 11 is a portion that contains the sphere 100. The separation portion 12 is a part of each sheet 21, 22 including the lower seal portion 32. The separation portion 12 is separated from the main body portion 11 using the notch 60 as a trigger, and an opening (not shown) that allows the sphere 100 to be removed from the storage space 10A is formed between the first sheet 21 and the second sheet 22. After the sphere 100 is removed from the storage space 10A, for example, the main body 11 can be folded compactly, which contributes to reducing the volume of waste. In addition, the sphere 100 can be removed from the storage space 10A by tearing the sheet 20, making it easier to remove the sphere 100 than the conventional technology, which requires opening a metal lid.

The pressurized package 10 further includes a communication section 70 that connects the storage space 10A with the outside. The position at which the communication section 70 is provided in the pressurized package 10 can be selected arbitrarily. In the example shown in FIG. 1 etc., the communication section 70 is provided at a location corresponding to the upper seal section 31. In another example, the communication section 70 is provided at a location corresponding to the lower seal section 32, the first side seal section 33, or the second side seal section 34.

The check valve 40 is provided in the communication part 70 so that the gas filled in the storage space 10A does not escape through the communication part 70. As shown in FIG. 3, the check valve 40 has a main body 41 and an insertion hole 42 penetrating the main body 41. The main body 41 is joined to the first sheet 21 and the second sheet 22 by the valve seal part 35 (see FIG. 1). The main body 41 is formed, for example, by injection molding using a single plastic. A nozzle 80 (see FIG. 4) is inserted into the insertion hole 42. For example, a tube 200 is connected to the nozzle 80. The tube 200 is connected to a pump (not shown). The pump supplies gas to the storage space 10A. The check valve 40 further includes a plug 43 and a flexible member 45. The plug 43 has an annular wall part 43A and an end wall part 43B. The annular wall part 43A and the end wall part 43B form a space 44. The space 44 opens toward the insertion hole 42. The space 44 receives the nozzle 80. The flexible member 45 connects the body 41 and the plug 43 so that the position of the plug 43 relative to the body 41 can be moved. When the check valve 40 and the nozzle 80 are not coupled as shown in FIG. 3, the flexible member 45 moves the plug 43 to a position where the plug 43 contacts the body 41. When the check valve 40 and the nozzle 80 are coupled as shown in FIG. 5, the flexible member 45 moves the plug 43 to a position where the plug 43 does not contact the body 41. Only when the check valve 40 and the nozzle 80 are coupled, the check valve 40 opens, and gas can be filled into the storage space 10A through the tube 200 and the nozzle 80. Specifically, gas sent from a pump connected to the tube 200 is filled into the storage space 10A through an opening 81 provided in the nozzle 80.

Figure 6 shows the pressure package 10 before the opening 50 is closed (hereinafter, "pressure package 10 before closing"). A sphere 100 (see Figure 1) is accommodated in the accommodation space 10A through the opening 50 of the pressure package 10 before closing. After the sphere 100 is accommodated, the lower seal portion 32 is formed, thereby obtaining the pressure package 10 after closing shown in Figure 1.

An example of a method for manufacturing the pressure package 10 will be described with reference to Figures 6 and 7. The method for manufacturing the pressure package 10 includes, for example, a sheet joining process, a valve attachment process, a storage process, a closing process, and a gas filling process.

In the sheet joining process, the first sheet 21 and the second sheet 22 are joined to form the upper seal portion 31, the first side seal portion 33, and the second side seal portion 34. The valve attachment process is performed after the sheet joining process. In the valve attachment process, the check valve 40 is inserted into the communication portion 70, and the first sheet 21 and the second sheet 22 are joined to the check valve 40 to form the valve seal portion 35. When the valve attachment process is completed, the pressurized package 10 before closing is manufactured as shown in FIG. 6. The accommodation process is performed after the valve attachment process. As shown in FIG. 7, in the accommodation process, the sphere 100 is accommodated in the accommodation space 10A through the opening 50 of the pressurized package 10 before closing. The closing process is performed after the accommodation process. In the closing process, the first sheet 21 and the second sheet 22 are joined to form the lower seal portion 32. The gas filling process is performed after the closing process. In the gas filling process, a nozzle 80 (see Figure 5) is inserted into the check valve 40, and gas is filled into the storage space 10A.

According to the pressure packing body 10 of the first embodiment, the following actions and effects can be obtained.
Since the storage space 10A is sealed by the seal portion 30 and the check valve 40, the gas filled in the storage space 10A is unlikely to escape to the outside. The plug 43 and the flexible member 45 provided in the check valve 40 can further enhance the sealing of the storage space 10A. Furthermore, if the gas in the storage space 10A escapes to the outside, gas can be easily filled in through the check valve 40. Therefore, the internal pressure of the sphere 100 is unlikely to decrease.

(Example)
The inventors of the present application conducted a test to confirm the relationship between the configuration of the pressure package 10 and the difficulty of reducing the internal pressure of the sphere 100, using samples of the example and the comparative example of the first embodiment. FIG. 8 shows the test conditions and test results for the sample of the example and the sample of the comparative example. In the following explanation, for the sake of convenience, the same reference numerals are used for the parts of the sample of the comparative example that are common to the sample of the example. The sample of the example is the pressure package 10 of the embodiment. The sample of the comparative example is a pressure package 10 having a different configuration from the sample of the example. The sample of the comparative example has the configuration shown in FIG. 1 of JP 2012-111556 A. In other words, the sample of the comparative example does not have a check valve 40.

The specifications of the samples of each example and each comparative example are as follows. The internal pressure of the sphere 100 of each example and each comparative example is 0.08 MPa. The pressure of the storage space 10A of the samples of Examples 1 and 2 and Comparative Examples 1 and 2 is 0.08 MPa. The pressure of the storage space 10A of the samples of Examples 3 and 4 and Comparative Examples 3 and 4 is 0.09 MPa. For the samples of each example and each comparative example, the pressurized package 10 after closing was manufactured by filling air using a SealTester manufactured by Sun Scientific Co., Ltd. Then, the samples of each example and each comparative example were stored in a thermostatic chamber maintained at a predetermined temperature and humidity. The thermostatic chamber used in the test was SXN412 manufactured by Kusumoto Chemical Co., Ltd. The temperature of the thermostatic chamber in which the samples of Examples 1 and 3 and the samples of Comparative Examples 1 and 3 were stored was 40°C. The temperature of the thermostatic bath in which the samples of Examples 2 and 4 and Comparative Examples 2 and 4 were stored was 50°C. The humidity of the thermostatic bath in which the samples of each Example and Comparative Example were stored was 75%. The samples of each Example and Comparative Example were stored in the thermostatic bath for two weeks. There were 10 samples of each Example and Comparative Example. The internal pressure of each Example and Comparative Example was measured using a digital pressure gauge KDM30-500 kPaG manufactured by Krone Co., Ltd.

In the test, the samples of each embodiment and each comparative example were visually inspected to see whether gas had escaped from the storage space 10A. The number of pieces of gas that had escaped shown in FIG. 8 indicates the number of samples in which gas had escaped from the storage space 10A and the pressurized packaging body 10 was in a deflated state.

It was confirmed that gas escaped from the storage space 10A in all of the comparative examples. It was confirmed that gas did not escape substantially from the storage space 10A in the samples of the examples. This is thought to be because the samples of the examples are equipped with a check valve 40, which effectively prevents gas from escaping from the storage space 10A to the outside.

Second Embodiment
A package 10 of the second embodiment will be described with reference to Fig. 9. Configurations common to the first embodiment are given the same reference numerals as in the first embodiment, and duplicated descriptions may be omitted. The package 10 of the second embodiment differs from the package 10 of the first embodiment in the configuration of the seal portion 30, but otherwise has the same configuration as the package 10 of the first embodiment.

Figure 9 shows the pressurized package 10 before it is closed. The seal portion 30 includes a contact prevention seal portion 130 that prevents the sphere 100 from contacting the check valve 40. This makes it difficult for the check valve 40 to be damaged. The contact prevention seal portion 130 is configured so that the pressure of the storage space 10A is unlikely to act locally. This makes it possible to prevent the contact prevention seal portion 130 from peeling off even when the pressure of the storage space 10A is relatively high. In one example, the contact prevention seal portion 130 is configured so that the portions that protrude into the storage space 10A from the upper seal portion 31, the first side seal portion 33, and the second side seal portion 34 do not include corners.

The contact prevention seal portion 130 includes a first contact prevention seal portion 131 connected to the first side seal portion 33, and a second contact prevention seal portion 132 connected to the second side seal portion 34. The width of each contact prevention seal portion 131, 132 increases as it approaches the check valve 40 from each side seal portion 33, 34. In other words, in the standard width direction XA, the distance XC between the inner edge 131A of the first contact prevention seal portion 131 and the inner edge 132A of the second contact prevention seal portion 132 decreases as it approaches the check valve 40. When the sphere 100 moves to approach the check valve 40 in the storage space 10A, the sphere 100 comes into contact with the inner edges 131A, 132A of the contact prevention seal portions 131, 132, so that the sphere 100 does not come into contact with the check valve 40.

The width of each contact prevention seal portion 131, 132 is the length between the inner edge 131A, 132A and the outer edge 131B, 132B on the normal line of the center line of each contact prevention seal portion 131, 132. The center line of each contact prevention seal portion 131, 132 is an imaginary line segment passing between the inner edge 131A, 132A and the outer edge 131B, 132B. When the width of each contact prevention seal portion 131, 132 varies from part to part, for example, the maximum width or the average width of multiple parts of each contact prevention seal portion 131, 132 represents the width of the seal portion. Each contact prevention seal portion 131, 132 is provided from each side seal portion 33, 34 to next to the check valve 40.

The width LA of each contact prevention seal portion 131, 132 in the standard width direction XA and the length LB of each contact prevention seal portion 131, 132 in the standard height direction XB are determined based on the relationship with the width LC of the communication portion 70. In one example, the width LA is 35 mm. The length LB is 80 mm. The width LC is 60 mm. The width LA of the first contact prevention seal portion 131 and the width LA of the second contact prevention seal portion 132 may be different. The length LB of the first contact prevention seal portion 131 and the length LB of the second contact prevention seal portion 132 may be different. According to the second embodiment of the pressurized package 10, the same action and effect as the first embodiment of the pressurized package 10 can be obtained.

(Example)
The inventors of the present application conducted a transport test and a drop test using a sample of the example related to the second embodiment to confirm the relationship between the configuration of the pressure package 10 and the resistance to breakage of the check valve 40. An example of breakage of the check valve is chipping and cracking. The specifications of the example sample are as follows. The internal pressure of the sphere 100 is 0.08 MPa. The pressure of the storage space 10A is 0.1 MPa. Twelve closed pressure packages 10 were manufactured by filling the example sample with nitrogen using a Seal Tester manufactured by Sun Scientific Co., Ltd. Each closed pressure package 10 contains six spheres 100.

In the transportation test, 12 closed pressure packages 10 packed in a cardboard box were placed in a transportation test machine. The transportation test machine used in the test was a CV-300-2 manufactured by IMV Corporation. The standard for the test method for the transportation test was Level 1 of JIS Z0200. In the drop test, 12 closed pressure packages 10 packed in a cardboard box were allowed to freely drop from a specified height onto concrete once on each of one corner, three edges, and six faces. The specified height was 80 cm. The standard for the test method for the drop test was JIS Z0202.

In the transport test and drop test, the check valve 40 of the example samples was visually inspected to see if it was damaged. In the example samples, no damage to the check valve 40 was confirmed for any of the 12 closed pressurized packages 10. The example sample relating to the second embodiment has a contact prevention seal portion 130, so there is no contact between the sphere 100 and the check valve 40. For this reason, it is believed that the check valve 40 is less likely to be damaged.

(Modification)
The above-mentioned embodiments are merely examples of possible forms of the pressurized packaging body according to the present invention, and are not intended to limit the forms. The packaging body according to the present invention may take forms different from those exemplified in the embodiments. Examples of such forms include forms in which a part of the configuration of each embodiment is replaced, changed, or omitted, or forms in which a new configuration is added to each embodiment. Below, an example of a modified version of each embodiment is shown.

The pressurized packaging body 10 of the modified examples of the first and second embodiments includes a zipper that is provided to open and close the opening formed when the separation-intended portion 12 is separated from the main body portion 11. The zipper is joined, for example, to the sealant layer 20E of the first sheet 21 and the sealant layer 20E of the second sheet 22. According to the modified pressurized packaging body 10, the opening can be closed even after the separation-intended portion 12 is separated from the main body portion 11, so that the sphere 100 can be carried in a state where it is contained in the main body portion 11. This improves convenience.

- The configuration of the contact prevention seal portion 130 can be changed as desired. As shown in FIG. 10, the pressurized package 10 of the first modified example of the second embodiment has a rectangular contact prevention seal portion 230 that protrudes from the upper seal portion 31, the first side seal portion 33, and the second side seal portion 34 into the storage space 10A. As shown in FIG. 11, the pressurized package 10 of the second modified example of the second embodiment has a rectangular contact prevention seal portion 330 that protrudes from the upper seal portion 31 into the storage space 10A. In the first and second modified examples of the second embodiment, when the sphere 100 moves to approach the check valve 40 in the storage space 10A, the contact prevention seal portions 230 and 330 prevent the sphere 100 from coming into contact with the check valve 40, so that the check valve 40 is less likely to be damaged. However, in the contact prevention seal part 230 shown in FIG. 10, the part that protrudes into the storage space 10A includes corners, so there is a risk of peeling off if the pressure in the storage space 10A of the second embodiment is high. Also, in the contact prevention seal part 330 shown in FIG. 11, there is a risk of edge tearing occurring at the base part on the upper seal part 31 side if the pressure in the storage space 10A is high.

10: Pressurized packaging body 10A: Storage space 20: Sheet 20E: Sealant layer 30: Sealed portion 33: First side sealed portion (side sealed portion)
34: Second side seal portion (side seal portion)
40: check valve 70: communication part 100: sphere 130, 230, 330: contact prevention seal part

Claims (8)

A pressure package that stores a gas-filled sphere while pressurizing it,
a flexible sheet having an accommodation space for accommodating the sphere;
A communication portion formed in the sheet for communicating the storage space with the outside;
a check valve provided in the communication portion,
The check valve is configured to allow gas to be filled into the storage space through the check valve and to prevent the gas filled in the storage space from escaping to the outside,
The sheet includes a seal portion joined to form the storage space,
The pressure package, characterized in that the sealing portion has a contact prevention seal portion that prevents the sphere contained in the storage space from contacting the check valve . The check valve includes a main body having a through hole, a plug for opening and closing the through hole, and a flexible member for connecting the main body and the plug,
2. The pressurized packaging body according to claim 1, wherein the plug opens the insertion hole when the gas is filled into the storage space, and closes the insertion hole after the gas has been filled into the storage space at a predetermined pressure. The pressurized packaging body according to claim 1 or 2, wherein the sheet is made of multiple sheets of heat-sealable material, and the storage space is formed by heat sealing at a predetermined sealing portion. The sheet includes a main body portion and a separation portion,
4. The pressure package according to claim 1, wherein the seal portion is provided with a notch for separating the main body portion and the intended separation portion. The pressurized packaging body according to claim 4, wherein the sheet is provided with a zipper for opening and closing an opening formed by the separation portion being separated from the main body portion. The pressure package according to any one of claims 1 to 5 , wherein the contact prevention seal portion is configured to increase in width from a side seal portion provided along a side edge of the sheet toward the check valve. The pressure package according to any one of claims 1 to 6 , wherein the storage space is pressurized at 25°C at a pressure in the range of 0.07 MPa or more and 0.2 MPa or less. The pressure package according to any one of claims 1 to 7 , further comprising the sphere housed in the housing space.