Liquid storage bag

Abstract

To provide a liquid storage bag in which a needle protruding downward from a liquid take-out port of a container pierces a bottom part of the bag, and which can take out liquid inside a bag to the end, prevents the liquid inside the bag from leaking in the container even if the container falls down, and has excellent recyclability.SOLUTION: A liquid storage bag 10 stores liquid therein and is stored upside down in a container 20 having a pump member 23 at an upper end, wherein a needle 24 protruding downward from the pump member 23 pierces a bottom part 13 of the bag. The bottom part 13 of the bag is composed of a bottom material 14 made of a polyethylene-based resin film. The bottom material 14 has at least a base material layer and a water stop layer. The base material layer has a breaking elongation of 300% or less in at least one direction of a longitudinal direction and a transverse direction. The water stop layer has a tear strength of 3 N or more in at least one direction of the longitudinal direction and the transverse direction, and a ratio of the tear strength in the longitudinal direction and the transverse direction (longitudinal direction and transverse direction) of 0.5 or more and 2 or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a liquid storage bag for storing liquids such as detergents, and more particularly to a liquid storage bag that is highly convenient and recyclable. [Background technology]

[0002] Conventionally, liquid detergents for use in homes have been sold in synthetic resin containers. When the detergent in the container runs out, the empty container is refilled with detergent refills contained in synthetic resin bags.

[0003] However, when refilling an empty container with refill detergent as described above, the refilling work is performed while holding a flexible synthetic resin bag in the hand, which makes the position of the bag's opening unstable. As a result, it is time-consuming to align the opening of the container with the opening of the bag, which can lead to the problem of detergent spilling out of the container.

[0004] To solve this problem, for example, as shown in Patent Document 1, a known configuration is one in which a synthetic resin bag (liquid storage bag) containing refill detergent is placed inside an empty container that has a pump member at the top end of the container that serves as a liquid extraction section and a suction needle that protrudes downward from the pump member, the suction needle is pierced into the bag, and the detergent inside the bag is extracted from the suction needle by moving the pump member up and down.

[0005] In the liquid storage bag shown in Patent Document 1, not only the part where the suction needle is pierced but the entire bag is made of a laminate film made by laminating a stretched nylon film and a polyolefin film. The stretched nylon film has the property of being easily torn when a force is applied in a tearing direction by the tip of the suction needle when the suction needle pierces it.

[0006] However, in the liquid storage bag described in Patent Document 1, the polyolefin film laminated to the stretched nylon film also breaks along with the stretched nylon film due to the force exerted when the suction needle is pierced into the bag, causing a tear in the laminated film at the tip of the suction needle. As a result, air enters the bag through the tear around the hole penetrated by the suction needle. Therefore, when the amount of detergent inside the bag decreases, operating the pump member sucks air through the suction needle, preventing the detergent from being completely removed from the bag. Furthermore, if the container falls over, the detergent inside the bag leaks through the tear, contaminating the container and even leaking outside the container.

[0007] As a means for solving the above problem, for example, Patent Document 2 discloses a liquid storage bag in which a liquid such as detergent is stored, characterized in that the entire bag has a layer made of a material with barrier properties, and in at least a portion of the bag, a layer of a laminate film made by laminating and bonding an unstretched nylon film and a polyolefin film is provided over the barrier layer without being bonded thereto. With the liquid storage bag disclosed in Patent Document 2, the detergent inside the bag can be removed to the last drop without causing tears in the laminate film. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 3526626 [Patent Document 2] Patent No. 2527529 Summary of the Invention [Problem to be solved by the invention]

[0009] However, with a liquid storage bag such as that shown in Patent Document 2, it is difficult to separate the individual layers (the unstretched nylon film, the polyolefin film, and the layer having barrier properties) after use. Therefore, with a liquid storage bag such as that shown in Patent Document 2, liquid storage bags collected after use are not suitable for recycling, and are not actively recycled at present.

[0010] To solve the above problems, the present invention aims to provide a liquid storage bag in which a needle protruding downward from a liquid outlet of a container pierces the bottom of the bag, which allows the liquid inside the bag to be taken out to the last, prevents the liquid inside the bag from leaking inside the container even if the container falls over, and is highly recyclable. [Means for solving the problem]

[0011] In order to solve the above problems, the present invention provides a liquid storage bag that stores liquid inside and is placed upside down inside a container that has a liquid outlet at its upper end, and a needle that protrudes downward from the liquid outlet is inserted into the bottom of the bag, the bottom of the bag being made of a base material made of a polyethylene resin film, the base material having at least a base layer and a water-stopping layer, the base layer having a breaking elongation of 300% or less in at least one of the longitudinal and lateral directions, and the water-stopping layer having a breaking elongation of 300% or less in the longitudinal and lateral directions. The pull of Tear strength ,both The tear strength is 3N or more, and the ratio of tear strength in the longitudinal direction to tear strength in the transverse direction (longitudinal direction / transverse direction) is 0.5 or more and 2 or less. [Effects of the Invention]

[0012] The present invention has the following effects. Specifically, even when a needle from a container with a liquid outlet is pierced into the bottom of the liquid storage bag according to the present invention, the needle piercing portion of the bag does not tear and adheres tightly to the needle, preventing air from entering the bag. Therefore, even when the amount of liquid inside the bag is small, the bag can be maintained in a vacuum state, allowing almost all of the liquid inside the bag to be removed. Furthermore, even if the container is toppled, the liquid inside the bag will not leak inside the container. Furthermore, a liquid storage bag made of polyethylene-based resin has excellent recyclability. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is an exploded perspective view of a container for accommodating a liquid storage bag according to the present invention; [Figure 2] 1 is a perspective view of a container for accommodating a liquid storage bag according to the present invention; [Figure 3] 1 is a perspective view of a liquid storage bag according to the present invention; [Figure 4] This is an oblique view illustrating the arrangement of the laminated film for the body material (the laminated film on the front and rear walls that will become the body material) and the laminated film for the bottom material when manufacturing the liquid storage bag of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] The following describes a liquid storage bag 10 according to an embodiment of the present invention. However, the present invention is not limited to these examples as long as it does not deviate from the gist of the present invention. Fig. 1 is an exploded perspective view of a container 20 that houses a liquid storage bag 10 according to the present invention. Fig. 2 is a perspective view of a container 20 that houses a liquid storage bag 10 according to the present invention. Fig. 3 is a perspective view of a liquid storage bag 10 according to the present invention. Fig. 4 is a perspective view illustrating the arrangement of a laminated film for a body material 15 (laminate films on the front and rear walls that will become the body material) and a laminated film for a base material 14 when manufacturing a liquid storage bag 10 according to the present invention.

[0015] 1 and 2, the liquid storage bag 10 is stored upside down inside a container 20 having a liquid outlet at the top. More specifically, the liquid storage bag 10 is placed in a container body 21 with the bottom 13 facing upward so that the bottom 13 is at the top, and a lid 22 is fitted onto the container body 21 from above, thereby storing the liquid storage bag inside the container 20.

[0016] A pump member 23, which serves as a liquid outlet, is attached to the lid 22. A needle 24 that protrudes downward is provided on the pump member 23. The needle 24 is inserted into the liquid storage bag 10 so that its tip pierces the bottom 13 of the liquid storage bag 10 placed in the container body 21 and is positioned near the lower end of the liquid storage bag 10.

[0017] As shown in Figure 3, liquid storage bag 10 is a stand-up pouch having body 12 with heat-sealed seals 11 on two opposing sides, and a bulging bottom 13. As shown in Figure 4, liquid storage bag 10 is manufactured, for example, by heat-sealing a folded base material 14 and two body materials 15 separate from base material 14 at predetermined locations.

[0018] The body material 15 forming the body portion 12 is made of a polyethylene-based resin film. Similarly, the base material 14 forming the bottom portion 13 is made of a polyethylene-based resin film. In this way, the liquid storage bag 10 is made of a polyethylene-based resin film.

[0019] The base material 14 has at least a base layer and a water-stopping layer.

[0020] The base material layer used in the base material 14 of the present invention has a breaking elongation of 300% or less in at least one of the longitudinal and transverse directions. If the breaking elongation of the base material layer of the base material 14 exceeds 300%, when the needle 24 for extracting liquid attached to the container 20 is pierced into the bottom 13, the film constituting the base material 14 will be stretched, and the needle 24 will not be able to pierce the bottom 13.

[0021] To make the breaking elongation of the base material layer of the base material 14 300% or less, it is preferable that the film constituting the base material 14 is stretched. The stretching process of the film constituting the base material 14 may be uniaxial or biaxial, and is more preferably biaxial. By biaxially stretching the film, the rigidity of the film is increased. Furthermore, in printing, laminating, or bag-making processes, the film is not stretched by tension in the thermal process when drying ink or adhesive, improving processability. In addition, in the case of uniaxial stretching, it is preferable that the film is stretched in the machine direction, which increases the rigidity against tension during processing.

[0022] The stretching ratio in the longitudinal and transverse directions of the base material layer of the base material 14 is preferably 2 to 10 times in the case of uniaxial stretching, and the product of the longitudinal and transverse stretching ratios (area ratio) is preferably 4 to 16 times in the case of biaxial stretching. By setting the stretching ratio in the longitudinal and transverse directions of the base material layer of the base material 14 to 2 times or more (in the case of uniaxial stretching) or 4 times or more (in the case of biaxial stretching), the breaking elongation of the base material layer of the base material 14 can be set to 300% or less, and the strength and heat resistance can be further improved. Furthermore, if the stretching ratio in the longitudinal and transverse directions of the base material layer of the base material 14 exceeds 10 times (in the case of uniaxial stretching) or 16 times (in the case of biaxial stretching), the base material layer of the base material 14 is prone to breakage during film production, making it impractical.

[0023] The base layer of the base material 14 may be an unstretched film of high density polyethylene or medium density polyethylene, or a stretched film of high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, or the like.

[0024] Furthermore, the base layer of the base material 14 may be formed by mixing two or more of the above polyethylenes. For example, by blending linear low-density polyethylene with high-density polyethylene, it is possible to form a film that is excellent in film formability, film rigidity, and transparency, and that can be suitably used as the base layer film of the base material 14.

[0025] The water-stopping layer used in the base material 14 of the present invention preferably has a tear strength of 3N or more in at least one of the longitudinal and transverse directions, and a ratio of tear strength in the longitudinal direction to tear strength in the transverse direction (longitudinal direction / transverse direction) of 0.5 or more and 2 or less.

[0026] If the tear strength in both the longitudinal and transverse directions of the water-stopping layer of the base material 14 is less than 3N, the film of the base material 14 will tear when pierced with the needle 24 of the container 20, resulting in liquid leakage and air getting in. As a result, it will not be possible to maintain a vacuum inside the liquid storage bag 10, which is a feature of the present invention, and the contents of the liquid storage bag 10 will not be able to be sucked out to the last drop.

[0027] Furthermore, by setting the ratio of tear strength in the longitudinal direction to the transverse direction (longitudinal direction / transverse direction) in the water-stopping layer of the base material 14 to 0.5 or more and 2.0 or less, the base material 14 can have excellent water-stopping properties.

[0028] That is, in the present invention, the water-stopping properties of the base material 14 are realized when the needle 24 of the container 20 pierces the bottom 13 of the liquid storage bag 10 and the film of the base material 14 stretches and wraps evenly around the needle 24 of the container 20. It has been found that when this happens, the film of the base material 14 stretches evenly around the circumference, which improves the water-stopping properties. When the ratio of the tear strength in the longitudinal direction to the transverse direction (longitudinal direction / transverse direction) in the water-stopping layer of the base material 14 falls within the range of the present invention, which is 0.5 or more and 2.0 or less, the film of the base material 14 stretches evenly and excellent water-stopping properties are obtained.

[0029] However, if the tear strength ratio (longitudinal / lateral) of the water-stopping layer of the base material 14 is less than 0.5 or exceeds 2.0, the film will be more likely to tear in one direction, resulting in uneven circumferential elongation. Furthermore, tearing of the film will also suppress elongation in the direction of higher tear strength, resulting in less overall elongation and variations in elongation. This results in a shorter wrapping length in areas with less elongation, resulting in insufficient water-stopping properties in those areas and causing liquid leakage from those areas. More preferably, the ratio (longitudinal / lateral) of the tear strength in the longitudinal direction to the lateral direction of the water-stopping layer of the base material 14 is 0.7 or more and 1.5 or less. The closer it is to 1.0, the better the water-stopping properties.

[0030] The water-stopping layer of the base material 14 can be made of an unstretched film of medium-density polyethylene, low-density polyethylene, linear low-density polyethylene, or the like, with unstretched films of low-density polyethylene and linear low-density polyethylene being particularly preferred, and an unstretched film made of linear low-density polyethylene by inflation molding being even more preferred.

[0031] Generally, linear low-density polyethylene films produced by inflation molding have higher tear strength than linear low-density polyethylene films produced by the T-die method because the molecular weight of the polyethylene used as the raw material is higher. Furthermore, because it is possible to reduce the anisotropy caused by the flow of the resin, the film has the characteristics required for the water-stopping layer of the base material 14 of the present invention, such as high tear strength and a ratio of longitudinal to transverse strength close to 1, making it suitable for use as the water-stopping layer of the base material 14 of the present invention.

[0032] When laminating the base material 14 of the present invention, the well-known dry lamination method, solventless lamination method or extrusion lamination method can be used, and the extrusion lamination method is more preferred.

[0033] Generally, the polyethylene resin used in the extrusion lamination method has a lower molecular weight than the polyethylene resin used in the base layer and water-stopping layer of the base material 14 of the present invention. Therefore, by using the extrusion lamination method, when the needle 24 of the container 20 is pierced into the bottom 13 of the liquid storage bag 10, the polyethylene resin layer used in the extrusion lamination acts as a buffer layer, preventing the water-stopping layer of the base material 14 from tearing along with the base layer of the base material 14, and also reducing the inclusion of adhesive, which could become a foreign substance, when the liquid storage bag 10 is recycled.

[0034] When producing the base material 14 of the present invention, it is sufficient to have at least a two-layer structure of a base material layer / water-stopping layer, and it is possible to laminate a separate layer with functionality such as a sealant layer, for example, such as a base material layer / water-stopping layer / sealant layer.

[0035] When the base material 14 is a substrate layer / waterstop layer, the waterstop layer also serves as a sealant layer, but if there is little difference in melting point between the substrate layer and the waterstop layer, the substrates are likely to fuse together or develop heat wrinkles during the bag-making process. In such cases, it is preferable to provide a separate sealant layer, such as a substrate layer / waterstop layer / sealant layer.

[0036] In this case, there are no particular restrictions on the breaking elongation or tear strength of the sealant layer of the base material 14 used, and any sealant film can be used, but an ultra-low temperature type linear low density polyethylene film produced by inflation molding is preferred.

[0037] In the present invention, the lamination strength between the base layer and the water blocking layer of the base material 14 is preferably 3.0 N / 15 mm or less, and more preferably 2.0 N / 15 mm or less.

[0038] By setting the lamination strength between the base material layer and the waterstop layer of the base material 14 to 3.0 N / 15 mm or less, when the needle 24 of the container 20 is pierced into the bottom 13 of the liquid storage bag 10, the base material layer and the waterstop layer of the base material 14 are bonded together when the tip of the needle 24 pierces the bottom 13, but as the needle 24 pierces the base material 14, the base material layer and the waterstop layer of the base material 14 delaminate as the needle 24 pierces the bottom 13. This causes the waterstop layer of the base material 14 to stretch without breaking, forming a waterstop band of the base material 14 that wraps around the needle 24, resulting in excellent waterstop properties.

[0039] If the lamination strength between the base layer and the water-stopping layer of the base material 14 exceeds 3.0 N / 15 mm, the water-stopping layer of the base material 14 may be easily torn when the needle 24 of the container 20 is pierced into the bottom 13 of the liquid storage bag 10, which is undesirable as it may result in poor water-stopping properties.

[0040] Furthermore, there is no particular lower limit to the lamination strength between the base material layer and the water-stopping layer of the base material 14, but it is preferable that it be 1.5 N / 15 mm or more in terms of ease of processing and preventing peeling due to external forces such as dropping or applying pressure during use.

[0041] To achieve a lamination strength of 3.0 N / 15 mm between the base layer and the water-stopping layer of the base material 14, for example, in the case of dry lamination or solventless lamination, it is possible to use a two-component curing polyether urethane adhesive or reduce the amount of adhesive applied. In the case of extrusion lamination, it is also possible to achieve this by adjusting the temperature and MFR (molecular weight) of the extruded resin.

[0042] Liquid storage bag 10 according to the present invention has a polyethylene resin content of 80% by mass or more, and preferably 90% by mass or more. In liquid storage bag 10, base material 14 forming bottom portion 13 is made of a polyethylene resin film, and body material 15 forming body portion 12 is made of a polyethylene resin film, thereby achieving a polyethylene resin content of 80% by mass or more. This allows the polyethylene resin films forming bottom material 14 and body material 15 to be suitably utilized when liquid storage bag 10 is recycled. If the polyethylene resin content is less than 80%, the polyethylene resin films forming bottom material 14 and body material 15 must be treated with a compatibilizer, dispersant, etc. when liquid storage bag 10 is recycled, which increases costs and makes it difficult to obtain good quality.

[0043] Furthermore, within the scope of not impairing the characteristics of the present invention, each layer (base layer, water-stopping layer) of the base material 14 may contain additives, such as crosslinking agents, antioxidants, antiblocking agents, slip agents, UV absorbers, light stabilizers, fillers, reinforcing agents, and antistatic agents.

[0044] Furthermore, the base material 14 and the body material 15 can be coated, printed, or vapor-deposited to impart light-blocking or barrier properties to the liquid storage bag 10. For example, light-blocking properties can be imparted to the liquid storage bag 10 by coating it with a coating agent containing titanium oxide or carbon black. Methods for imparting barrier properties to the liquid storage bag 10 include coating it with a polyvinyl alcohol (PVAL), vinyl acetate (PVAc), ethylene-vinyl alcohol copolymer (EVOH), or polyvinylidene chloride (PVDC) coating agent. Furthermore, vapor deposition can impart light-blocking or barrier properties to the liquid storage bag 10 by vapor-depositing inorganic oxides such as silica, alumina, zinc oxide, or magnesium oxide, or metals such as aluminum or tin.

[0045] Next, the liquid storage bag 10 of the present invention, which is manufactured using the above-described films for the body material 15 and the base material 14, will be specifically described with reference to examples and comparative examples. [Example]

[0046] (Creating body material 15) The base layer of the body material 15 has a density of 0.932 g / cm 3 A non-stretched linear low-density polyethylene film (40 μm) made by a T-die method was used as the sealant layer of the body material 15. 3 An unstretched linear low-density polyethylene film (40 μm) made by an inflation method and made of linear low-density polyethylene was used. The base layer film of the body material 15 and the sealant layer film of the body material 15 were bonded together by a dry lamination method (amount applied when dried: 3.5 g) using a two-component curing polyester urethane adhesive, and then aged at 40° C. for 24 hours to obtain the body material 15.

[0047] (Creating base material 14) A biaxially oriented polyethylene film (40 μm) made of linear low-density polyethylene was used as the base layer of the base material 14. The breaking elongation of the film was 260% in the longitudinal direction and 100% in the transverse direction. The breaking elongation of the film was determined in accordance with "JIS K7127:1999 (ISO527-3:1995) Plastics - Test methods for tensile properties - Part 3: Test conditions for films and sheets" (note that the breaking elongation of the film described below was also determined in the same manner).

[0048] The waterproof layer of the base material 14 was an unstretched linear low-density polyethylene film (80 μm) produced by the inflation method. The breaking elongation of the film was 650% in the longitudinal direction and 750% in the transverse direction. The tear strength of the film was 6.0 N in the longitudinal direction and 10.4 N in the transverse direction, and the longitudinal / transverse ratio of the tear strength of the film (longitudinal / transverse direction) was 0.58. The tear strength of the film was determined in accordance with JIS K7128-3:1998 "Testing method for tear strength of plastic films and sheets" (note that the tear strength of the file described below was also determined using the same method).

[0049] These base layer films and water blocking layer films were bonded together by extrusion lamination using LDPE (low density polyethylene), to produce the base material 14. The extrusion temperature of the LDPE was 320°C, and the thickness was 15 μm.

[0050] (Creating the liquid storage bag 10) The obtained base material 14 and body material 15 were used to create a liquid storage bag 10. The outer dimensions of the liquid storage bag 10 were 145 mm in width and 240 mm in length, and the width of the bottom gusset portion, i.e., the length from the bottom edge of the liquid storage bag 10 to the folded-back portion of the film of the base material 14, was 45 mm.

[0051] The obtained liquid storage bag 10 was filled with 500 ml of water and placed with the bottom 13 facing upward in a container 20 having a pump member 23 (liquid outlet) at the top end. When a liquid outlet needle 24 attached to the container 20 was tried to be pierced into the bottom 13, the needle 24 could be easily pierced into the bottom 13.

[0052] With the needle 24 inserted into the bottom 13, the pump member 23, which serves as the liquid outlet, was operated to eject water until the liquid storage bag 10 was empty. No air entered the liquid storage bag 10, and the amount of water remaining in the liquid storage bag 10 was 5.6 g. [Example]

[0053] In Example 2, a liquid storage bag 10 of Example 2 was produced in the same manner as in Example 1, except that an unstretched linear low-density polyethylene film (40 μm) produced by an inflation method, in which the film had a breaking elongation of 650% in the longitudinal direction and 750% in the transverse direction, a tear strength of 3.0 N in the longitudinal direction and 5.2 N in the transverse direction, and a longitudinal / transverse ratio of tear strength of the film was 0.58, was used as the water-stopping layer of the base material 14. The liquid storage bag 10 of Example 2 had no problems with the piercing ability of the needle 24 in the bottom 13 (base material 14) or the ability to discharge water from the pump member 23, and the amount of water remaining in the liquid storage bag 10 was 4.8 g. [Example]

[0054] In Example 3, a liquid storage bag 10 was prepared in the same manner as in Example 1, except that a biaxially oriented polyethylene film (20 μm) made of linear low-density polyethylene was used as the base layer of the base material 14, and a discharge test was conducted. The breaking elongation of the film of the base layer of the base material 14 was 228% in the longitudinal direction and 46% in the transverse direction. The liquid storage bag 10 of Example 3 had no problems with the piercing ability of the needle 24 in the bottom 13 (base material 14) or the discharge ability of water from the pump member 23, and the amount of water remaining in the liquid storage bag 10 was 6.1 g.

[0055] (Comparative Example 1) In Comparative Example 1, a liquid storage bag for Comparative Example 1 was obtained in the same manner as Example 1, except that an unstretched linear low-density polyethylene film (40 μ) produced using a T-die method, with a film breaking elongation of 620% in the longitudinal direction and 760% in the transverse direction, was used as the base material layer of the base material.

[0056] The obtained liquid storage bag of Comparative Example 1 was filled with water, and the liquid storage bag was placed with its bottom facing up in container 20, which had pump member 23 (liquid outlet) at its upper end. When needle 24 for extracting liquid attached to container 20 was tried to pierce the bottom of the liquid storage bag, the base material stretched, and needle 24 could not be pierced into the bottom (base material) of the liquid storage bag.

[0057] (Comparative Example 2) In Comparative Example 2, a liquid storage bag for hearing was obtained in the same manner as in Example 1, except that a non-stretched linear low-density polyethylene film (30 μm) produced by the inflation method, in which the film's breaking elongation was 650% in the longitudinal direction and 750% in the transverse direction, the film's tear strength was 2.3 N in the longitudinal direction and 3.9 N in the transverse direction, and the film's longitudinal / transverse tear strength ratio was 0.59, was used as the water-stopping layer of the base material.

[0058] When the obtained liquid storage bag of Comparative Example 2 was subjected to an ejection test in the same manner as in Example 1, air was sucked in through the puncture opening of needle 24 at the bottom of the liquid storage bag, and it was not possible to suck out all the water from the liquid storage bag.

[0059] When the hole pierced by the needle 24 at the bottom of the liquid storage bag of Comparative Example 2 was observed, it was confirmed that the film of the water-stopping layer of the base material had not stretched sufficiently, and a gap had formed.

[0060] (Comparative Example 3) In Comparative Example 3, a linear low-density polyethylene film was used as the water-stopping layer of the base material, with a film breaking elongation of 760% in the longitudinal direction and 830% in the transverse direction, a film tear strength of 1.8 N in the longitudinal direction and 5.6 N in the transverse direction, and a film tear strength longitudinal / transverse ratio of 0.32.

[0061] When the obtained liquid storage bag of Comparative Example 3 was subjected to an ejection test in the same manner as in Example 1, air was sucked in through the puncture opening of needle 24 at the bottom of the liquid storage bag, and it was not possible to suck out all the water from the liquid storage bag.

[0062] When the hole pierced by the needle 24 at the bottom of the liquid storage bag of Comparative Example 3 was observed, it was confirmed that the film of the water-stopping layer of the base material had not stretched sufficiently, and a gap had formed. [Industrial Applicability]

[0063] The liquid storage bag of the present invention is suitable for storing liquids such as detergents, does not require refilling, and the contents can be used almost entirely without coming into contact with air.After use, the liquid storage bag can be recycled as polyethylene, making it ideal for use as a liquid storage bag that reduces environmental impact. [Explanation of symbols]

[0064] 10 Liquid storage bag 13 Bottom 14 Bottom material 20 containers 23 Pump component (liquid outlet) 24 Needle

Claims

1. A liquid storage bag that is placed upside down inside a container that stores a liquid therein and has a liquid outlet at its upper end, and a needle that protrudes downward from the liquid outlet pierces the bottom of the bag, The bottom of the bag is made of a base material made of a polyethylene resin film, The base material has at least a base layer and a water-stopping layer, the base material layer has a breaking elongation of 300% or less in at least one of the longitudinal direction and the transverse direction, The water-stopping layer has a tear strength of 3N or more in both the longitudinal and transverse directions, and the ratio of the tear strength in the longitudinal direction to the transverse direction (longitudinal direction / transverse direction) is 0.5 or more and 2 or less. A liquid storage bag characterized by:

2. The body of the bag is made of a body material made of a polyethylene resin film.

2. The liquid storage bag according to claim 1,

Images