Pressurizing package

Abstract

To provide a pressure-applying package capable of easily and surely performing filling in a storage space, and to provide a manufacturing method of the pressure-applying package.SOLUTION: A pressure-applying package 10 stored while pressurizing a sphere 100 in which gas is filled comprises a flexible sheet 20 for forming a storage space 10A in which the sphere 100 is stored; a communication part 70 for communicating the storage space 10A with an outside, that is formed on the sheet 20; and a nonreturn valve 40 provided to the communication part 70. The nonreturn valve 40 controls the gas filled in the storage space 10A to be vented to the outside, while filling the gas in the storage space 10A via the nonreturn valve 40.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a pressurized package for accommodating a sphere filled with a gas while pressurizing the sphere and a method for manufacturing the pressurized package.

Background Art

[0002] A pressurized package for accommodating a sphere filled with a gas such as nitrogen is known. For example, Patent Document 1 discloses a plastic blow-molded container (1) for accommodating a tennis ball which is an example of a sphere. The plastic blow-molded container (1) includes a body portion (11) for accommodating a tennis ball and an aluminum lid (2) attached to an opening of the body portion (11). The body portion (11) is filled with a gas so that the internal pressure becomes, for example, 1 kg / cm 2 or the like.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the above-described plastic blow-molded container (1) has a problem that it is not easy to fill the inside with a gas and pressurize it. Further, structurally, there is a problem that the opening of the body portion (11) may bend, etc., and there is a risk that the gas may escape from between the opening of the body portion (11) and the aluminum lid (2), and the internal pressure of the sphere is likely to decrease. Furthermore, since the container (1) has rigidity, there is also a problem that it is difficult to reduce the volume of waste after taking out the sphere from the container (1). Furthermore, in order to prevent leakage of the gas inside the container as much as possible, since the opening of the body portion (11) is firmly closed by the aluminum lid (2), there is also a problem that it is difficult to open the aluminum lid (2) and it is difficult to take out the sphere.

Means for Solving the Problems

[0005] The present invention is a pressurized package for accommodating a gas-filled sphere while pressurizing the sphere, and includes a flexible sheet in which an accommodation space for accommodating the sphere is formed, a communication part formed in the sheet and communicating the accommodation space with the outside, and a check valve provided in the communication part. The check valve is characterized in that gas is filled into the accommodation space through the check valve, and leakage of the gas filled in the accommodation space to the outside is restricted. According to the above pressurized package, gas can be easily and surely filled into the accommodation space through the check valve. Further, since there is no or almost no risk of gas leaking from the check valve or the sheet, a decrease in the internal pressure of the sphere can be prevented. Further, since it is mainly composed of a flexible sheet, after taking out the sphere from the pressurized package, waste reduction can be achieved by folding it compactly or the like. Further, since the pressurized package can be opened by tearing the sheet or the like, the sphere can be easily taken out.

[0006] Further, the check valve includes a main body part having a penetrating insertion hole, a plug for opening and closing the insertion hole, and a flexible member for connecting the main body part and the plug. The plug may be configured to open the insertion port when the accommodation space is filled with gas, and to close the insertion port after the accommodation space is filled with gas at a predetermined pressure. According to this, gas can be easily and surely filled into the accommodation space through the check valve, and leakage of the gas filled in the accommodation space to the outside can be surely restricted.

[0007] Further, the sheet may be composed of a plurality of heat-sealable materials and the accommodation space may be formed by heat-sealing at a predetermined seal part. According to this, an accommodation space having a desired shape and size can be formed, and leakage of the gas filled in the accommodation space to the outside through the sheet can be surely restricted.

[0008] Further, the sheet may include a main body portion and a portion scheduled to be separated, and the seal portion may be provided with a notch for separating the main body portion and the portion scheduled to be separated. According to this, the pressurized package can be easily and surely opened by simply tearing the sheet starting from the notch provided in the seal portion.

[0009] Further, the sheet may include a chuck for opening and closing an opening formed by separating the portion scheduled to be separated from the main body portion. According to this, even after the portion scheduled to be separated is separated from the main body portion, the opening can be closed, so that the sphere can be carried while being accommodated in the main body portion, improving convenience.

[0010] Further, 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 such that the width increases as it approaches the check valve from a side seal portion provided along the side edge of the sheet. According to these, contact between the sphere and the check valve is prevented, and it is possible to prevent the check valve from accidentally opening or being damaged.

[0011] Further, the accommodation space is preferably pressurized at a pressure in the range of 0.07 MPa or more and 0.2 MPa or less at 25°C. According to this, it is possible to pressurize the accommodation space to a pressure equal to or higher than the internal pressure of the sphere accommodated in the accommodation space within the pressure resistance range of the sheet.

[0012] Further, the pressurized package may include the sphere accommodated in the accommodation space. According to this, the same effects as those of the above-described pressurized package can be obtained.

[0013] The manufacturing method of the pressurizing package according to the present invention further includes a flexible sheet in which an accommodation space for accommodating a sphere filled with gas is formed, a communication part formed in the sheet for communicating the accommodation space with the outside, and a check valve provided in the communication part for regulating the escape of the gas filled in the accommodation space to the outside. The method includes the steps of preparing a pre-pressurization pressurizing package having the above components, accommodating the sphere in the accommodation space through an opening formed in the pressurizing package, closing the opening of the pressurizing package, and filling the accommodation space of the pressurizing package with gas through the check valve to pressurize the package to a pressure equal to or higher than the internal pressure of the sphere. According to this, the above pressurizing package can be manufactured easily and reliably.

Effects of the Invention

[0014] According to the present invention, gas can be easily and reliably filled into the accommodation space through the check valve. In addition, since there is no or almost no risk of gas escaping from the check valve or the sheet, it is possible to prevent a decrease in the internal pressure of the sphere. Further, since it is mainly composed of a flexible sheet, after the sphere is taken out from the pressurizing package, it can be folded compactly to reduce waste. In addition, since the pressurizing package can be opened by tearing the sheet, the sphere can be easily taken out.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0016] (First Embodiment) FIG. 1 shows an example of a pressurized package 10 that houses 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 arbitrarily selected. The gas filled in the sphere 100 is, for example, nitrogen or air. The internal pressure of the sphere 100 can be arbitrarily selected. The internal pressure of the sphere 100 is, for example, in the range of 0.07 Mpa or more and 0.08 Mpa or less at 25°C. The number of spheres 100 housed in the pressurized package 10 can be arbitrarily selected. In the example shown in FIG. 1 and the like, the number of spheres 100 housed in the pressurized package 10 is two.

[0017] The main elements constituting the pressurized package 10 are a sheet 20, a seal portion 30, and a check valve 40. The dots in FIG. 1 and the like represent the seal portion 30. Hereinafter, in the front view of the pressurized package 10, the left-right direction of the pressurized package 10 will be referred to as the standard width direction XA, and the direction orthogonal to the standard width direction XA will be referred to as the standard height direction XB.

[0018] 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 such that an accommodation space 10A for accommodating the sphere 100 is formed between the sheets 21 and 22. An arbitrary gas is filled in the accommodation space 10A so that the gas filled in the sphere 100 does not escape from the sphere 100. The gas filled in the accommodation space 10A can be arbitrarily selected. In one example, the gas filled in the accommodation space 10A is nitrogen or air. The pressure of the accommodation space 10A is set in a range equal to or higher than the internal pressure of the sphere 100. The pressure of the accommodation space 10A is included in a range of, for example, 0.07 Mpa or more and 0.2 Mpa or less at 25°C. In one example, the pressure of the accommodation space 10A is 0.1 Mpa.

[0019] The first sheet 21 and the second sheet 22 are two individually formed sheets. The sheet 20 has a layer structure in which a plurality of layers are laminated. The layer structure of the sheet 20 can be arbitrarily selected. In the first example, each of the sheets 21 and 22 has the same layer structure. In the second example, each of the sheets 21 and 22 has a different layer structure. FIG. 1 shows a pressurized package 10 composed of the sheet 20 having the layer structure of the first example.

[0020] FIG. 2 is a cross-sectional structure obtained by cutting each of the sheets 21 and 22 along the thickness direction. Each of the sheets 21 and 22 includes an outermost layer 20A, a first adhesive layer 20B, an intermediate layer 20C, a second adhesive layer 20D, and a sealant layer 20E. An example of the manufacturing method of each of the sheets 21 and 22 is dry lamination.

[0021] The outermost layer 20A is laminated at the outermost position of the sheet 20, that is, at the position farthest from the sphere 100. The outermost layer 20A is composed of, for example, a material having excellent gas barrier properties. For this reason, the quality of the sphere 100 is maintained well over a long period. The material constituting the outermost layer 20A is, for example, polyethylene terephthalate with an inorganic thin film such as aluminum oxide or silicon oxide vapor-deposited thereon. The gas whose permeation is suppressed by the outermost layer 20A is, for example, oxygen. The thickness of the outermost layer 20A can be arbitrarily selected. The thickness of the outermost layer 20A is, for example, 12 μm.

[0022] 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. The material constituting the first adhesive layer 20B is, for example, a polyester urethane-based adhesive. The thickness of the first adhesive layer 20B can be arbitrarily selected. The thickness of the first adhesive layer 20B is, for example, 2 μm.

[0023] The intermediate layer 20C is, for example, laminated on the sphere 100 side with respect to the outermost layer 20A. Hereinafter, the sphere 100 side may be referred to as the inner side with respect to any layer. The intermediate layer 20C is, for example, composed of an excellent material to enhance the piercing strength. The material constituting the intermediate layer 20C is, for example, nylon. The thickness of the intermediate layer 20C can be arbitrarily selected. The thickness of the intermediate layer 20C is, for example, 25 μm.

[0024] 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-based adhesive. The thickness of the second adhesive layer 20D can be arbitrarily selected. The thickness of the second adhesive layer 20D is, for example, 2 μm.

[0025] The sealant layer 20E is laminated, for example, at the innermost side of the sheet 20, that is to say, at the position closest to the sphere 100. The sealant layer 20E is composed of, for example, 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 arbitrarily selected. The thickness of the sealant layer 20E is preferably determined based on the relationship between the difficulty of peeling of the seal portion 30 and the thickness of the sheet 20. A preferred example of the maximum value of the 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 value of the thickness of the sealant layer 20E is 80 μm. When the thickness of the sealant layer 20E is 80 μm or more, the sealing strength of the seal portion 30 can be increased, and even when the pressure in the accommodation space 10A is high, the seal portion 30 is difficult to peel off. A preferred range of the thickness that the sealant layer 20E can take is, for example, 80 μm or more and 160 μm or less. In one example, the thickness of the sealant layer 20E is 120 μm.

[0026] The seal 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 in a front view can be arbitrarily selected. 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 seal portion 30 (hereinafter referred to as the "inner portion 23") and the seal portion 30. The accommodation 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 seal portion 30 and the check valve 40 so as not to communicate with the outside of the pressurized package 10.

[0027] The seal part 30 includes an upper seal part 31, a lower seal part 32, a first side seal part 33, a second side seal part 34, and a valve seal part 35. The upper seal part 31 and the valve seal part 35 are provided above the inner part 23 in the standard height direction XB. The lower seal part 32 closes the opening 50 (see FIG. 6). The lower seal part 32 is provided below the inner part 23 in the standard height direction XB. The first side seal part 33 is provided on the right or left side of the inner part 23 in the standard width direction XA. The second side seal part 34 is provided on the left or right side of the inner part 23 in the standard width direction XA.

[0028] The inner edge 31A of the upper seal part 31, the inner edge 32A of the lower seal part 32, the inner edge 33A of the first side seal part 33, the inner edge 34A of the second side seal part 34, and the inner edge 35A of the valve seal part 35 define the inner contour of the inner part 23. The outer edge 31B of the upper seal part 31, the outer edge 32B of the lower seal part 32, the outer edge 33B of the first side seal part 33, the outer edge 34B of the second side seal part 34, and the outer edge 35B of the valve seal part 35 define the outer contour of the pressure-applied package 10.

[0029] The width of each seal part 31 - 35 can be arbitrarily selected. The width of each seal part 31 - 35 is the length between the inner edge 31A - 35A and the outer edge 31B - 35B on the normal line of the center line of each seal part 31 - 35. The center line of each seal part 31 - 35 is a virtual line segment passing between the inner edge 31A - 35A and the outer edge 31B - 35B. When the width of each seal part 31 - 35 is different for each part, for example, the maximum width, or the average of the widths of a plurality of parts in each seal part 31 - 35 represents the width of that seal part.

[0030] The sealing strength of the sealing portion 30 can be arbitrarily selected. The sealing strength of the sealing portion 30 is preferably determined based on the relationship between the difficulty of peeling of the sealing portion 30 and the ease of heat sealing. An example of the maximum value of the sealing strength of the sealing portion 30 is 130 N / 15 mm. When the sealing strength of the sealing portion 30 is 80 N / 15 mm or less, the sealing portion 30 cannot be formed under standard conditions. An example of the minimum value of the sealing strength of the sealing portion 30 is 70 N / 15 mm. When the sealing strength of the sealing portion 30 is 90 N / 15 mm or more, the sealing portion 30 is difficult to peel even when the pressure in the accommodation space 10A is high. An example of the range that the sealing strength of the sealing portion 30 can take is 90 N / 15 m or more to 130 N / 15 mm or less. In one example, the sealing strength of the sealing portion 30 is 100 N / 15 mm.

[0031] The width and height of the pressurized package 10 are preferably determined, for example, from the relationship with the number of spheres 100 to be accommodated and the ease of carrying the pressurized package 10. The width of the pressurized package 10 is the length between the outer edge 33B of the first side sealing portion 33 and the outer edge 34B of the second side sealing portion 34 in a line segment orthogonal to the standard height direction XB. When the width of the pressurized package 10 varies from part to part, for example, the maximum width or the average of the widths of a plurality of parts represents the width of the pressurized package 10. According to one example, the width of the pressurized package 10 is 130 mm. The height of the pressurized package 10 is the length between the outer edge 31B of the upper sealing portion 31 and the outer edge 32B of the lower sealing portion 32 in a line segment orthogonal to the standard width direction XA. When the height of the pressurized package 10 varies from part to part, for example, the maximum height or the average of the heights of a plurality of parts represents the height of the pressurized package 10. According to one example, the height of the pressurized package 10 is 200 mm.

[0032] The width of the inner part 23 of the pressurizing package 10 is preferably determined such that, for example, when the pressurizing package 10 is being carried, the sphere 100 cannot substantially move in the standard width direction XA of the pressurizing package 10. For this reason, the position of the sphere 100 in the accommodation space 10A is stabilized. The width of the inner part 23 of the pressurizing 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 segment orthogonal to the standard height direction XB. When the width of the inner part 23 varies from part to part, for example, the maximum width, or the average of the widths of a plurality of parts, represents the width of the inner part 23. 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.

[0033] The opening 50 (see FIG. 6) is formed between the lower part 21A of the first sheet 21 and the lower part 22A of the second sheet 22 so that the sphere 100 can be inserted into the accommodation space 10A. In the pressurizing package 10 shown in FIG. 1, the opening 50 is closed by the lower seal part 32. The pressurizing package 10 with the opening 50 closed (hereinafter, the “pressurizing package 10 after closing”) includes the main body part 11 and the planned separation part 12. The main body part 11 and the planned separation part 12 are divided by a notch 60 provided in the seal part 30. The main body part 11 is the part that houses the sphere 100. The planned separation part 12 is a part of each of the sheets 21 and 22 including the lower seal part 32. By separating the planned separation part 12 from the main body part 11 with the notch 60 as a trigger, an opening (not shown) through which the sphere 100 can be taken out from the accommodation space 10A is formed between the first sheet 21 and the second sheet 22. After the sphere 100 is taken out from the accommodation space 10A, for example, the main body part 11 can be folded compactly, thus contributing to the reduction of waste. Also, by tearing the sheet 20, the sphere 100 can be taken out from the accommodation space 10A, so the sphere 100 can be taken out more easily than in the case of opening a metal lid as in the prior art.

[0034] The pressurizing package 10 further includes a communication portion 70 that communicates the accommodation space 10A with the outside. The position where the communication portion 70 is provided in the pressurizing package 10 can be arbitrarily selected. In the example shown in FIG. 1 and the like, the communication portion 70 is provided at a location corresponding to the upper seal portion 31. In another example, the communication portion 70 is provided at a location corresponding to the lower seal portion 32, the first side seal portion 33, or the second side seal portion 34.

[0035] The check valve 40 is provided at the communication portion 70 so that the gas filled in the accommodation space 10A does not escape through the communication portion 70. As shown in FIG. 3, the check valve 40 includes 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 a valve seal portion 35 (see FIG. 1). The main body 41 is formed, for example, by injection molding with 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 accommodation space 10A. The check valve 40 further includes a plug 43 and a flexible member 45. The plug 43 has an annular wall portion 43A and an end wall portion 43B. The annular wall portion 43A and the end wall portion 43B constitute 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 main body 41 and the plug 43 so that the position of the plug 43 with respect to the main body 41 can be moved. When the check valve 40 and the nozzle 80 are not connected as shown in FIG. 3, the flexible member 45 moves the plug 43 to a position where the plug 43 contacts the main body 41. When the check valve 40 and the nozzle 80 are connected as shown in FIG. 5, the flexible member 45 moves the plug 43 to a position where the plug 43 does not contact the main body 41. Only when the check valve 40 and the nozzle 80 are connected, the check valve 40 opens and the accommodation space 10A can be filled with gas through the tube 200 and the nozzle 80. Specifically, the gas sent from the pump connected to the tube 200 is filled into the accommodation space 10A through the opening 81 provided in the nozzle 80.

[0036] FIG. 6 shows the pressurized package 10 before the opening 50 is closed (hereinafter, the "pressurized package 10 before closing"). The sphere 100 (see FIG. 1) is accommodated in the accommodation space 10A from the opening 50 of the pressurized package 10 before closing. After the sphere 100 is accommodated, the lower seal portion 32 is formed, whereby the pressurized package 10 after closing shown in FIG. 1 is obtained.

[0037] With reference to FIGS. 6 and 7, an example of a method for manufacturing the pressurized package 10 will be described. The method for manufacturing the pressurized package 10 includes, for example, a sheet joining step, a valve attachment step, an accommodation step, a closing step, and a gas filling step.

[0038] In the sheet joining step, the first sheet 21 and the second sheet 22 are joined so that the upper seal portion 31, the first side seal portion 33, and the second side seal portion 34 are formed. The valve attachment step is performed after the sheet joining step. In the valve attachment step, the check valve 40 is inserted into the communication portion 70, and the first sheet 21, the second sheet 22, and the check valve 40 are joined so that the valve seal portion 35 is formed. When the valve attachment step is completed, as shown in FIG. 6, the pressurized package 10 before closing is manufactured. The accommodation step is performed after the valve attachment step. As shown in FIG. 7, in the accommodation step, the sphere 100 is accommodated in the accommodation space 10A through the opening 50 of the pressurized package 10 before closing. The closing step is performed after the accommodation step. In the closing step, the first sheet 21 and the second sheet 22 are joined so that the lower seal portion 32 is formed. The gas filling step is performed after the closing step. In the gas filling step, the nozzle 80 (see FIG. 5) is inserted into the check valve 40, and the accommodation space 10A is filled with gas.

[0039] According to the pressurized package 10 of the first embodiment, the following operations 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 difficult 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. Further, when the gas in the storage space 10A escapes to the outside, the gas can be easily filled through the check valve 40. Therefore, the internal pressure of the spherical body 100 is difficult to decrease.

[0040] (Example) The inventor of the present application conducted a test to confirm the relationship between the configuration of the pressurized package 10 and the difficulty of the internal pressure of the spherical body 100 from decreasing, using the samples of the examples and comparative examples of the first embodiment. FIG. 8 shows the test conditions and test results for the samples of the examples and the comparative examples. In the following description, for the sake of convenience of explanation, the same reference numerals are given to the parts common to the sample of the example in the sample of the comparative example. The sample of the example is the pressurized package 10 according to the embodiment. The sample of the comparative example is a pressurized package 10 having a configuration different from that of the sample of the example. The sample of the comparative example has the configuration shown in FIG. 1 of JP-A-2012-111556. That is, the sample of the comparative example does not include the check valve 40.

[0041] The specifications for the samples of each example and each comparative example are as follows. The internal pressure of the sphere 100 in each example and each comparative example is 0.08 Mpa. The pressure in the accommodation space 10A of the samples of Examples 1 and 2 and the samples of Comparative Examples 1 and 2 is 0.08 Mpa. The pressure in the accommodation space 10A of the samples of Examples 3 and 4 and the samples of Comparative Examples 3 and 4 is 0.09 Mpa. In 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 Science Co., Ltd. Then, the samples of each example and the samples of each comparative example were stored in a thermostatic chamber maintained at a predetermined temperature and humidity. The thermostatic chamber used in the test is SXN412 manufactured by Kusumoto Kasei 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 are stored is 40°C. The temperature of the thermostatic chamber in which the samples of Examples 2 and 4 and the samples of Comparative Examples 2 and 4 are stored is 50°C. The humidity of the thermostatic chamber in which the samples of each example and the samples of each comparative example are stored is 75%. The period for which the samples of each example and the samples of each comparative example were stored in the thermostatic chamber is two weeks. The number of samples of each example and each comparative example is 10 each. The internal pressure of each example and each comparative example was measured using a digital pressure gauge KDM30-500 kPaG manufactured by Krohne Co., Ltd.

[0042] In the test, for the samples of each example and the samples of each comparative example, it was visually confirmed whether gas was leaking from the accommodation space 10A. The number of items of the leakage count shown in FIG. 8 indicates the number of samples in which gas has leaked from the accommodation space 10A and the pressurized package 10 has deflated.

[0043] According to the samples of each comparative example, it was confirmed that gas had leaked from the accommodation space 10A for all the samples. According to the samples of each example, it was confirmed that substantially no gas had leaked from the accommodation space 10A. It is considered that this is because the samples of each example are provided with the check valve 40, and thus gas leakage from the accommodation space 10A to the outside is preferably suppressed.

[0044] (Second Embodiment) Referring to FIG. 9, the package 10 of the second embodiment will be described. For the components common to the first embodiment, the same reference numerals as those in the first embodiment will be used, and redundant descriptions may be omitted. The package 10 of the second embodiment is different from the package 10 of the first embodiment in the configuration of the seal portion 30, and has the same configuration as the package 10 of the first embodiment in other respects.

[0045] FIG. 9 shows the pressure package 10 before closing. The seal portion 30 includes a contact prevention seal portion 130 that prevents the sphere 100 from contacting the check valve 40. Therefore, the check valve 40 is less likely to be damaged. The contact prevention seal portion 130 is configured such that the pressure in the accommodation space 10A does not act locally easily. Therefore, even when the pressure in the accommodation space 10A is relatively high, it is possible to suppress the contact prevention seal portion 130 from peeling off. In one example, the contact prevention seal portion 130 is configured such that the portions projecting from the upper seal portion 31, the first side seal portion 33, and the second side seal portion 34 into the accommodation space 10A do not include corners.

[0046] 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. Each of the contact prevention seal portions 131 and 132 widens as it approaches the check valve 40 from each of the side seal portions 33 and 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 becomes narrower as it approaches the check valve 40. When the sphere 100 attempts to move closer to the check valve 40 in the accommodation space 10A, the sphere 100 contacts the inner edges 131A and 132A of the respective contact prevention seal portions 131 and 132, so that the sphere 100 and the check valve 40 do not contact each other.

[0047] The width of each contact prevention seal part 131, 132 is the length between the inner edges 131A, 132A and the outer edges 131B, 132B on the normal line of the center line of each contact prevention seal part 131, 132. The center line of each contact prevention seal part 131, 132 is a virtual line segment passing between the inner edges 131A, 132A and the outer edges 131B, 132B. When the widths of the contact prevention seal parts 131, 132 vary for each part, for example, the maximum width, or the average of the widths of a plurality of parts in each of the contact prevention seal parts 131, 132 represents the width of that seal part. Each contact prevention seal part 131, 132 is provided from each side seal part 33, 34 to adjacent to the check valve 40.

[0048] The widths LA of the contact prevention seal parts 131, 132 in the standard width direction XA and the lengths LB of the contact prevention seal parts 131, 132 in the standard height direction XB are determined based on the relationship with the width LC of the communication part 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 part 131 and the width LA of the second contact prevention seal part 132 may be different. The length LB of the first contact prevention seal part 131 and the length LB of the second contact prevention seal part 132 may be different. According to the pressurized package 10 of the second embodiment, the actions and effects similar to those of the pressurized package 10 of the first embodiment can be obtained.

[0049] (Example) The inventor of the present application conducted a transportation test and a drop test to confirm the relationship between the configuration of the pressurized package 10 and the difficulty of breakage of the check valve 40 using the samples of the examples related to the second embodiment. An example of breakage of the check valve is chipping and cracking. The specifications of the samples of the examples are as follows. The internal pressure of the sphere 100 is 0.08 Mpa. The pressure of the accommodation space 10A is 0.1 Mpa. By filling nitrogen using a SealTester manufactured by Sun Science Co., Ltd. for the samples of the examples, 12 pressurized packages 10 after closing were manufactured. Each of the pressurized packages 10 after closing contains 6 spheres 100.

[0050] In the transportation test, 12 pressurized packages 10 after closing, which were packed in a cardboard box, were placed in a transportation tester. The transportation tester used in the test was a CV-300-2 manufactured by IMV Co., Ltd. The standard of the test method for the transportation test was level 1 of JIS Z0200. In the drop test, 12 pressurized packages 10 after closing, which were packed in a cardboard box, were freely dropped onto concrete from a specified height, with each of the six sides of the triangular prism being dropped once. The specified height was 80 cm. The standard of the test method for the drop test was JIS Z0202.

[0051] In the transportation test and the drop test, it was visually confirmed whether the check valve 40 of the sample of the example was damaged. According to the sample of the example, no damage to the check valve 40 was confirmed for all 12 pressurized packages 10 after closing. Since the sample of the example related to the second embodiment includes the contact prevention seal portion 130, the sphere 100 and the check valve 40 do not come into contact. Therefore, it is considered that the check valve 40 is less likely to be damaged.

[0052] (Modification example) Note that each of the above embodiments is an example of a form that the pressurized package according to the present invention can take, and is not intended to limit that form. The package according to the present invention can take a form different from the forms exemplified in each embodiment. An example thereof is a form in which a part of the configuration of each embodiment is replaced, changed, or omitted, or a form in which a new configuration is added to each embodiment. An example of a modification of each embodiment is shown below.

[0053] · The pressurized package 10 of the modification example of the first embodiment and the second embodiment is provided with a chuck that can open and close an opening formed by separating the separation planned portion 12 from the main body portion 11. The chuck is joined to, for example, the sealant layer 20E of the first sheet 21 and the sealant layer 20E of the second sheet 22. According to the pressurized package 10 of the modification example, even after the separation planned portion 12 is separated from the main body portion 11, the opening can be closed, so that the sphere 100 can be carried while being housed in the main body portion 11. Therefore, the convenience is enhanced.

[0054] · The configuration of the contact prevention seal part 130 can be arbitrarily changed. As shown in FIG. 10, the pressurized package 10 of the first modification example of the second embodiment includes a rectangular contact prevention seal part 230 that projects into the accommodation space 10A from the upper seal part 31, the first side seal part 33, and the second side seal part 34. As shown in FIG. 11, the pressurized package 10 of the second modification example of the second embodiment includes a rectangular contact prevention seal part 330 that projects into the accommodation space 10A from the upper seal part 31. In the first and second modification examples of the second embodiment, when the sphere 100 tries to move closer to the check valve 40 in the accommodation space 10A, the contact prevention seal parts 230 and 330 prevent the sphere 100 and the check valve 40 from coming into contact, so the check valve 40 is less likely to be damaged. However, in the contact prevention seal part 230 shown in FIG. 10, since the protruding part in the accommodation space 10A includes corners, there is a risk of peeling when the pressure in the accommodation 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 breakage at the root part on the upper seal part 31 side when the pressure in the accommodation space 10A is high.

Explanation of Reference Numerals

[0055] 10: Pressurized package 10A: Accommodation space 20: Sheet 20E: Sealant layer 30: Seal part 33: First side seal part (side seal part) 34: Second side seal part (side seal part) 40: Check valve 70: Communication part 100: Sphere 130, 230, 330: Contact prevention seal part

Claims

1. A pressurized package for containing a gas-filled sphere while pressurizing the sphere, comprising: a flexible sheet in which an accommodation space for accommodating the sphere is formed; a communication part formed in the sheet and communicating the accommodation space with the outside; a check valve provided in the communication part; the check valve is configured such that gas is filled into the accommodation space through the check valve and the gas filled in the accommodation space is restricted from escaping to the outside; the sheet includes a seal part joined so that the accommodation space is formed; the seal part has a contact prevention seal part that prevents the sphere accommodated in the accommodation space from contacting the check valve, and is characterized by the pressurized package.

2. The check valve includes a main body part having a penetrating insertion hole, a plug that opens and closes the insertion hole, and a flexible member that connects the main body part and the plug; The plug is configured to open the insertion hole when the accommodation space is filled with gas, and to close the insertion hole after the accommodation space is filled with gas at a predetermined pressure. The pressurized package according to Claim 1.

3. The sheet is composed of a plurality of heat-sealable materials and is heat-sealed at a predetermined seal part to form the accommodation space. The pressurized package according to Claim 1 or Claim 2.

4. The sheet includes a main body part and a part to be separated; The seal part is provided with a notch for separating the main body part and the part to be separated. The pressurized package according to any one of Claims 1 to 3.

5. The sheet includes a chuck for opening and closing an opening formed when the part to be separated is separated from the main body part. The pressurized package according to Claim 4.

6. The contact prevention seal part is configured to have a width that increases as it approaches the check valve from a side seal part provided along a side edge of the sheet. The pressurized package according to any one of Claims 1 to 5.

7. The accommodation space is pressurized at a pressure in the range of 0.07 MPa or more and 0.2 MPa or less at 25°C. The pressurized package according to any one of Claims 1 to 6.

8. The pressurized package according to any one of Claims 1 to 7, comprising the sphere accommodated in the accommodation space.

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