JP6924395B2 - Bag with permeable material - Google Patents

Description

The present invention relates to a bag provided with a water permeable member that allows water to permeate.

A bag made of a flexible packaging material is used as a bag for storing contents such as food. For example, Patent Document 1 discloses, as an example of such a bag, a bag provided with a water-permeable member that vertically partitions the space inside the bag. The bag contains dried food that can be restored by water.

Consumers first open the top of the bag and then pour water into the bag. After the dried food is restored, the consumer opens the bottom of the bag and drains the water from the bottom through the permeable member. The water-permeable member is formed with a large number of holes for allowing water to pass through.

Japanese Patent No. 4614366

In order to discharge water quickly, it is preferable that the opening ratio of the water permeable member is large. As a method of increasing the opening ratio of the water permeable member, it is conceivable to increase the size of the holes or increase the density of the holes. However, in either case, the stiffness of the water-permeable member is reduced, and as a result, the bag manufacturing suitability, that is, the bag manufacturing suitability is deteriorated.

The present invention has been made in consideration of such a problem, and an object of the present invention is to provide a bag having water permeability and bag making suitability.

The present invention is a bag, which has water permeability of a front surface film constituting the front surface of the bag and a back surface film constituting the back surface facing the front surface, and vertically partitions the space inside the bag. As described above, the water permeable member is provided with the inner surface of the front surface film and the water permeable member fixed to the inner surface of the back surface film, and the water permeable member intersects the first fibers with a plurality of linearly extending first fibers. It is a bag having at least a plurality of second fibers extending linearly and having a water permeability capable of allowing water to permeate the water permeable member by its own weight.

In the bag according to the present invention, the first spacing between the first fibers is 0.5 mm or more and 5.0 mm or less, and the second spacing between the second fibers is 0.5 mm or more and 5.0 mm or less. May be good.

In the bag according to the present invention, the opening ratio of the water permeable member may be 30% or more and 70% or less.

In the bag according to the present invention, the water permeable member 20 may further have a third fiber extending linearly so as to intersect the first fiber and the second fiber.

According to the present invention, it is possible to provide a bag having water permeability and bag making suitability.

It is a front view which shows the bag in embodiment of this invention. It is an exploded view which shows the film which comprises the bag shown in FIG. It is sectional drawing which shows the case which the bag shown in FIG. 1 is seen along the line III-III. It is sectional drawing which shows an example of the layer structure of the front surface film and the back surface film of a bag. It is a top view which shows the case where the water-permeable member of a bag is developed. It is a figure which shows a part of the manufacturing process of a bag. It is sectional drawing which shows the state which water was injected into the bag shown in FIG. It is sectional drawing which shows the state that water is discharged from the lower part of a bag. It is sectional drawing which shows the bag after water is discharged from the lower part of the bag. It is sectional drawing which shows the bag in the 1st modification. It is a front view which shows the bag in the 2nd modification. FIG. 5 is a cross-sectional view showing a case where the bag shown in FIG. 11 is viewed along the line XII-XII. It is sectional drawing which shows the state which water was injected into the bag shown in FIG. It is a front view which shows the water-permeable member of the bag in the comparative form.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 9. In the drawings attached to the present specification, the scale, aspect ratio, etc. are appropriately changed from those of the actual product and exaggerated for the convenience of illustration and comprehension.

In addition, as used in the present specification, the terms such as "parallel", "orthogonal", and "same" and the values of length and angle that specify the shape and geometric conditions and their degrees are strictly used. Without being bound by meaning, we will interpret it including the range in which similar functions can be expected.

(bag)
FIG. 1 is a front view showing a case where the bag 10 in the present embodiment is viewed from the front surface side. Further, FIG. 2 is an exploded view showing a film constituting the bag 10. In addition, in this specification, a "bag" is a concept including not only a bag in which the contents are contained but also a bag in which the contents are not contained.

The bag 10 includes an upper portion 11, a lower portion 12, and a side portion 13, and has a rectangular contour. In addition, names such as "upper part", "lower part" and "side part", and terms such as "upper", "lower", "vertical direction" and "horizontal direction" are used in the normal usage of the bag 10. The position and direction of the bag 10 and its constituent elements are represented with the permeation direction when water permeates through the water-permeable member 20 described later by its own weight as the lower side.

In the present embodiment, by opening the upper portion 11 of the bag 10 and injecting water from the upper portion 11 into the inside of the bag 10, the contents are absorbed by the contents inside the bag 10 and the contents are restored. It is assumed that the bag 10 is used. Note that "water" is meant a liquid containing of H _{2 O} in the liquid state. The temperature of water is not particularly limited. For example, water may be a room temperature liquid containing H 2 _O, may be a high temperature for example 80 ° C. a liquid including H 2 _O.

The content is a solid that is restored by water inside the bag 10, for example, dried food. Examples of dried foods include dried shiitake mushrooms and seaweed.

The bag 10 may be sold, for example, with the contents contained therein, sealed by a seal portion described later. In this case, the consumer opens the bag 10 at the upper portion 11 and injects water from the upper portion 11 into the inside of the bag 10 to restore the contents contained in the bag 10. Further, the bag 10 may be sold in a state where a part of the bag 10 is opened and the contents are not contained. The consumer puts the contents into the bag 10 through the opening and then injects water to restore the contents inside the bag 10. The bag 10 may be sold in a state where it is sealed by a sealing portion and contains no contents.

As shown in FIGS. 1 and 2, the bag 10 includes a front surface film 14, a back surface film 15, and a water permeable member 20. The front surface film 14 constitutes the front surface of the bag 10, and the back surface film 15 constitutes the back surface facing the front surface. The inner surfaces of the front surface film 14 and the back surface film 15 are joined by a sealing portion. Further, the water permeable member 20 is located between the front surface film 14 and the back surface film 15. The water permeable member 20 is fixed to the inner surface of the front surface film 14 and the inner surface of the back surface film 15.

The terms "front surface film" and "back surface film" merely divide the sheets constituting the bag 10 according to the positional relationship of the outer surfaces of the bag 10, and provide the sheets when manufacturing the bag 10. The method is not limited by the terms mentioned above. For example, the bag 10 may be manufactured by using one film in which the front surface film 14 and the back surface film 15 are connected in succession, or by using one front surface film 14 and one back surface film 15. May be done.

The sealing portion is a portion where the inner surface of the front surface film 14 and the inner surface of the back surface film 15 are joined. In the plan view of the bag 10 as shown in FIG. 1, the seal portion is hatched. Further, in the present application, the water permeable member 20 is also hatched in the plan view for convenience. As will be described later, since the water permeable member 20 has an opening, the portion where the water permeable member 20 is located between the front surface film 14 and the back surface film 15 is also the inner surface of the front surface film 14. The inner surface of the back surface film 15 can be bonded.

As long as the facing front film 14 and the back surface film 15 can be joined to seal the bag 10, the method for forming the sealing portion is not particularly limited. For example, the inner surface of the front surface film 14 and the inner surface of the back surface film 15 may be melted by heating or the like, and the inner surfaces may be welded to each other to form a sealing portion. Alternatively, the sealing portion may be formed by adhering the inner surface of the facing front film 14 and the inner surface of the back surface film 15 with an adhesive or the like.

As shown in FIG. 1, the sealing portion has an outer edge sealing portion extending along the outer edge of the bag 10. The outer edge seal portion includes an upper seal portion 11a extending along the upper portion 11, a lower seal portion 12a extending along the lower portion 12, and a pair of side seal portions 13a extending along the pair of side portions 13.

The water permeable member 20 is a member provided to vertically partition the space inside the bag 10. In the example shown in FIG. 1, the space inside the bag 10 is divided into a first space 16a above the water permeable member 20 and a second space 16b below the water permeable member 20 by the water permeable member 20. It is partitioned into. The "inside of the bag 10" means a space between the front surface film 14 and the back surface film 15. As shown in FIGS. 1 and 2, the water permeable member 20 is inserted between the front surface film 14 and the back surface film 15 in a folded state so that the folded portion 20c is located upward.

FIG. 3 is a cross-sectional view showing the case where the bag 10 shown in FIG. 1 is viewed along the line III-III. When the bag 10 is sold with the contents 18 housed in the bag 10, the contents 18 are located in the first space 16a.

In the present embodiment, the water permeable member 20 is located closer to the lower portion 12 as shown in FIG. Note that "closer to the lower portion 12" means that the distance from the lower portion 12 to the first joint portion 21 and the second joint portion 22 is smaller than the distance from the upper portion 11 to the first joint portion 21 and the second joint portion 22, respectively. Means. Further, “closer to the upper portion 11” described later means that the distance from the upper portion 11 to the first joint portion 21 and the second joint portion 22 is from the distance from the lower portion 12 to the first joint portion 21 and the second joint portion 22, respectively. Also means small.

A part of the surface of the folded water-permeable member 20 facing the surface film 14 is fixed to the inner surface 14x of the surface film 14 by the first joint portion 21. The first joint portion 21 may be a portion formed by welding the surface film 14 and the water permeable member 20, or may be an adhesive. Further, a part of the surface of the folded water-permeable member 20 facing the back surface film 15 is fixed to the inner surface 15x of the back surface film 15 by the second joint portion 22. The second joint portion 22 may be a portion formed by welding the back surface film 15 and the water permeable member 20, or may be an adhesive. The first joint portion 21 and the second joint portion 22 each extend from one of the pair of side seal portions 13a so as to straddle the other.

The first joint portion 21 may be formed so as to include an end portion (first end portion 20a) of the water-permeable member 20 in the folded state on the surface film 14 side, and includes the first end portion 20a. It may be formed so as not to be present. Similarly, the second joint portion 22 may be formed so as to include an end portion (second end portion 20b) of the water permeable member 20 in the folded state on the back surface film 15 side, and the second end portion may be formed. It may be formed so as not to contain 20b. For example, the first joint portion 21 is formed so as to include the first end portion 20a and not to include the folded-back portion 20c, and the second joint portion 22 includes the second end portion 20b and does not include the folded-back portion 20c. Is formed in.

(Film layer structure)
Next, the layer structure of the front surface film 14 and the back surface film 15 will be described. FIG. 4 is a cross-sectional view showing an example of the layer structure of the front surface film 14 and the back surface film 15.

As shown in FIG. 4, the front surface film 14 and the back surface film 15 include at least the sealant layer 36 and the base material layer 37. In the example shown in FIG. 7, the sealant layer 36 constitutes the inner surface 14x of the front surface film 14 and the inner surface 15x of the back surface film 15. Further, the base material layer 37 constitutes the outer surface 14y of the front surface film 14 and the outer surface 15y of the back surface film 15.

As the material constituting the sealant layer 36, for example, polyethylene or polypropylene can be used. The thickness of the sealant layer 36 is, for example, 40 μm or more and 160 μm or less.

As the material constituting the base material layer 37, for example, polyethylene terephthalate, plastic such as polypropylene or nylon, or paper can be used. The base material layer 37 has high heat resistance required when forming a seal portion by heat welding. When the base material layer 37 is plastic, it may be stretched uniaxially or biaxially. Further, the base material layer 37 may be provided with a print display for showing product information or giving an aesthetic impression. Examples of the print display include characters, numbers, symbols, figures, and patterns. When the base material layer 37 is plastic, the thickness of the base material layer 37 is, for example, 4 μm or more and 30 μm or less. When the base material layer 37 is paper, the thickness (basis weight) of the base material layer 37 is, for example, 20 g / m ² or more and 100 g / m ² or less.

Examples of the method of laminating the sealant layer 36 on the base material layer 37 include a melt extrusion method and a dry laminating method. In the melt extrusion method, the material constituting the sealant layer 36 is extruded onto the base material layer 37. In the dry laminating method, the film-shaped sealant layer 36 and the film-shaped base material layer 37 are bonded together using an adhesive.

The thickness of the front surface film 14 and the back surface film 15 is, for example, 40 μm or more and 220 μm or less.

The front surface film 14 and the back surface film 15 may include layers other than the sealant layer 36 and the base material layer 37. For example, the front surface film 14 and the back surface film 15 may further include a functional layer located between the sealant layer 36 and the base material layer 37.

As the functional layer, an appropriate one can be selected according to the required performance such as water vapor and other gas barrier properties, light shielding properties, and various mechanical strengths. For example, when the functional layer is a gas barrier layer, a vapor-deposited layer of an inorganic substance such as aluminum or an inorganic oxide such as aluminum oxide or silicon oxide may be provided. In addition, as the gas barrier layer, a resin layer having a gas barrier property such as an ethylene-vinyl alcohol copolymer (EVOH), a polyvinylidene chloride resin (PVDC), or an aromatic polyamide such as nylon MXD6 may be provided. By providing such a gas barrier layer, it is possible to prevent oxygen and water vapor from entering the inside of the bag 10. Further, in order to impart mechanical strength, a support may be provided as a functional layer. As the support, the same one as the base material layer can be used. For example, a stretched nylon film may be provided as a support. In this case, the puncture resistance of the bag 10 can be improved.

The functional layer may be provided on the surface of the base material layer 37 opposite to the sealant layer 36, not between the sealant layer 36 and the base material layer 37.

Needless to say, the layer structure of the front surface film 14 and the back surface film 15 is not limited to those described above. Further, the layer structure of the front surface film 14 and the layer structure of the back surface film 15 may be the same or different.

(Structure of water permeable member)
Next, the structure of the water permeable member 20 will be described in detail. FIG. 5 is a plan view showing the water permeable member 20 in an unfolded state.

The water permeable member 20 is a non-woven fabric in which a plurality of fibers are laminated so as to intersect each other, and is, for example, Warif (registered trademark). The water permeable member 20 has at least a plurality of first fibers 23 extending linearly and a plurality of second fibers 24 extending linearly so as to intersect the first fibers 23. Such a water permeable member 20 is manufactured, for example, by splitting and stretching a plastic film and laminating it. The portion of the water-permeable member 20 where no fibers such as the first fiber 23 and the second fiber 24 are present becomes the opening 26 through which water can permeate.

The water permeable member 20 has a water permeability that allows water to permeate the water permeable member 20 by its own weight. Specifically, the time required for water at 25 ° C. ^{to permeate 30 ml of water through an area of 2 cm 2} of the water permeable member 20 by its own weight is within 2 seconds (after the cylinder contains 30 ml of water). , The time required for water to disappear from the cylinder when water is permeated through the water permeable member).

In FIG. 5, reference numeral D1 represents a first direction in which the plurality of first fibers 23 extend, and reference numeral D2 represents a second direction in which the plurality of second fibers 24 extend. The first direction D1 and the second direction D2 intersect, for example, are orthogonal to each other. The angle formed by the first direction D1 and the second direction D2 is preferably 80 ° or more and 100 ° or less.

In FIG. 5, reference numeral P1 represents an interval (first interval) between two adjacent first fibers 23, and reference numeral P2 is an interval (second interval) between two adjacent second fibers 24. ). The first spacing P1 of the first fiber 23, the second spacing P2 of the second fiber 24, and the width W1 of the first fiber 23 and the width W2 of the second fiber 24 are the aperture ratio and strength required for the water permeable member 20. It is set based on. In the present application, the first interval P1 is the distance between the centers of the two adjacent first fibers 23 in the direction orthogonal to the first direction D1. Similarly, the second interval P2 is the distance between the centers of the two adjacent second fibers 24 in the direction orthogonal to the second direction D2. Further, in the present application, the aperture ratio of the water permeable member 20 is the ratio of the area occupied by the opening 26 to the total area of the water permeable member 20.

The first interval P1 and the second interval P2 are preferably 0.5 mm or more, and more preferably 1.0 mm or more. The first interval P1 and the second interval P2 are preferably 5.0 mm or less, and more preferably 2.0 mm or less. The width W1 of the first fiber 23 and the width W2 of the second fiber 24 are preferably 0.25 mm or more, and more preferably 0.6 mm or more. The width W1 of the first fiber 23 and the width W2 of the second fiber 24 are preferably 1.0 mm or less, more preferably 0.8 mm or less. The aperture ratio of the water permeable member 20 is preferably 30% or more, more preferably 50% or more. The aperture ratio of the water permeable member 20 is preferably 70% or less, more preferably 60% or less. By setting in this way, the water permeable member 20 can have a predetermined water permeability and strength.

Hereinafter, the advantages of the bag 10 provided with the water-permeable member 20 described above will be described by comparing with the bag according to the comparative form. FIG. 14 is a plan view showing the water permeable member 120 included in the bag in the form of comparison. The water permeable member 120 has a plurality of holes 126 as openings for allowing water to permeate. In this case, if an attempt is made to increase the opening ratio of the water permeable member 120, the size of the holes will be increased or the density of the holes will be increased. However, when the film-shaped permeable member 120 has a large number of holes 126, the stress generated in the permeable member 120 when the permeable member 120 is pulled or bent is uniformly applied in the plane of the permeable member 120. It does not occur, but occurs intensively around the hole 126. Therefore, if the size of the holes is increased or the density of the holes is increased, the non-uniformity of the stress distribution generated in the permeable member 120 becomes higher, and the stiffness of the permeable member 120 decreases.

Further, the holes 126 are formed by performing a hole-drilling treatment on the flat film constituting the water-permeable member 120. The drilling process involves pressing a mold provided with a large number of needles against the film. This step is carried out with the needle heated. Therefore, burrs are generated around the holes 126, and as a result, it becomes difficult for water to permeate through the water permeable member 120. Further, when a needle is used, the temperature around the portion of the film where the pores are formed becomes locally higher than that of the other portion. In this case, in the step of manufacturing the bag using the water permeable member 120, if the water permeable member 120 is heated again, it is conceivable that the water permeable member 120 is locally deformed such as shrinkage.

On the other hand, in the present embodiment, the water permeable member 20 is configured by laminating the first fiber 23 and the second fiber 24 so as to intersect each other. Therefore, the uniformity of the distribution of stress generated in the permeable member 20 when the permeable member 20 is pulled or bent can be enhanced, and the stiffness of the permeable member 20 can be enhanced.

The first fiber 23 and the second fiber 24 are preferably annealed after being stretched and before being laminated. Thereby, the first fiber 23 and the second fiber 24 can be heat-fixed. This makes it possible to prevent the water-permeable member 20 from being deformed, such as shrinking, when the water-permeable member 20 is heated in the subsequent manufacturing process of the bag 10.

Further, preferably, the width W1 and the first interval P1 of the plurality of first fibers 23 are uniform, and similarly, the widths W2 and the second interval P2 of the plurality of second fibers 24 are also uniform. As a result, the distribution of stress generated in the permeable member 20 can be made uniform. In other words, it is possible to suppress the concentration of stress on a part of the water permeable member 20. Therefore, it is possible to prevent the water permeable member 20 from being deformed. In addition, "uniformity" means that the standard deviation calculated by measuring the dimensions of a plurality of objects is not more than a predetermined value. For example, with respect to the width W1 of the first fiber 23, “uniform” means that the standard deviation calculated by measuring the width W1 of the first fiber 23 at 10 points is 0.2 mm or less. Similarly, for the first interval P1 of the first fiber 23, the width W2 of the second fiber 24, and the second interval P2, "uniform" means that the standard deviation calculated by measuring the dimensions at 10 points is 0.2 mm or less. Means that

For reference, as a result of preparing the water permeable member 20 and measuring the second interval P2 of the second fiber 24 at 10 points, the measured values are 1.645 mm, 1.645 mm, 1.548 mm, 1.527 mm, 1 It was .591 mm, 1.355 mm, 1.602 mm, 1.323 mm, 1.430 mm, and 1.161 mm. The average value is 1.48 mm and the standard deviation is 0.16 mm.

As shown in FIG. 5, the water permeable member 20 may further include a plurality of third fibers 25 extending along the third direction. The third direction D3 from which the third fiber 25 extends intersects both the first direction D1 and the second direction D2. The angle formed by the third fiber 25 with respect to the first fiber 23 is, for example, 5 ° or more and 10 ° or less. As will be described later, the first direction D1 in which the first fiber 23 extends may coincide with the transport direction T for transporting the water permeable member 20 when the bag 10 is manufactured. By providing such a third fiber 25, the strength of the water permeable member 20 can be further increased.

The third spacing P3 between the two adjacent third fibers 25 is preferably 0.5 mm or more, more preferably 1.0 mm or more. The third interval P3 is preferably 5.0 mm or less, more preferably 2.0 mm or less. The width W3 of the third fiber 25 is preferably 0.25 mm or more, more preferably 0.6 mm or more. The width W3 of the third fiber 25 is preferably 1.0 mm or less, more preferably 0.8 mm or less. Further, preferably, the width W3 of the third fiber 25 and the third interval P3 are also the same as the width W1 of the first fiber 23 described above, and “uniform” is a standard calculated by measuring the dimensions at 10 points. It means that the deviation is 0.2 mm or less.

As the material constituting the first fiber 23, the second fiber 24, and the third fiber 25, polyolefins such as polyethylene and polypropylene can be used. The materials constituting the first fiber 23, the second fiber 24, and the third fiber 25 may be the same or different.

When the water-permeable member 20 is a non-woven fabric in which a plurality of fibers are laminated so as to intersect with each other, the tensile strength at a width of 50 mm as measured according to ASTM D882 can be 100 N or more and 300 N or less.

(Other components)
The bag 10 may be provided with an easy-opening means 17 for breaking the bag 10 and facilitating opening the bag 10. The easy-opening means 17 may be formed on the upper part of the bag 10 or may be formed on the lower part 12 of the bag 10. In the example shown in FIG. 1, easy-opening means 17 are provided on both the upper portion 11 and the lower portion 12. The easy-opening means 17 is, for example, a notch formed in the side seal portion 13a.

As shown in FIG. 1, the bag 10 may include a chuck tape 30 that traverses the first space 16a of the bag 10. As shown in FIG. 3, the chuck tape 30 includes a first fitting portion 31 and a second fitting portion 32 that are fitted to each other. By providing the chuck tape 30, the bag 10 can be opened on the upper portion 11 side along the easy-opening means 17, water can be injected into the inside of the bag 10, and then the bag 10 can be resealed on the upper portion 11.

Bag Manufacturing Method Next, an example of the method for manufacturing the bag 10 described above will be described.

First, a long front surface film 14, a back surface film 15, and a water permeable member 20 are prepared. Subsequently, as shown in FIG. 6, the water-permeable member 20 in a state of being folded back by the folded-back portion 20c is arranged between the inner surface 14x of the front surface film 14 and the inner surface 15x of the back surface film 15. Further, the elongated front surface film 14, the back surface film 15, and the water permeable member 20 are each conveyed along the conveying direction T. The transport direction T coincides with, for example, the first direction D1 in which the first fiber 23 of the water permeable member 20 extends. For example, the angle formed by the first direction D1 and the transport direction T is 0 ° or more and 10 ° or less.

Subsequently, the inner surface 14x of the front surface film 14 and the inner surface 15x of the back surface film 15 are partially heated to form the above-mentioned lower seal portion 12a and side seal portion 13a, and the front surface film 14 and the back surface film 15 are formed. Link. At this time, the portion of the water permeable member 20 corresponding to the side sealing portion 13a is fixed to the front surface film 14 and the back surface film 15. Further, the water permeable member 20 is partially heated via the front surface film 14 and the back surface film 15 to form the first joint portion 21 and the second joint portion 22 described above, and the water permeable member 20 is formed on the front surface film 14 and the water permeable member 20. It is fixed to the back surface film 15. After that, the elongated front surface film 14, the back surface film 15, and the water permeable member 20 are cut along the side sealing portion 13a. In this way, a bag 10 having a front surface film 14, a back surface film 15, and a water permeable member 20 and having an open upper portion 11 can be obtained.

Then, the bag 10 is filled with the contents through the opening of the upper portion 11. Subsequently, the bag 10 is heated along the upper portion 11 to form the above-mentioned upper seal portion 11a, and the bag 10 is sealed. In this way, the bag 10 containing the contents can be obtained.

Here, in the present embodiment, since the water permeable member 20 is formed by laminating a plurality of fibers such as the first fiber 23 and the second fiber 24, the water permeable member 20 has a high elasticity. ing. Therefore, when the water permeable member 20 is pulled in the transport direction T in the manufacturing process of the bag 10, deformation such as wrinkles and wrinkles is unlikely to occur due to the water permeable member 20. As a result, the tension applied to the water permeable member 20 can be increased, and therefore the transport speed of the water permeable member 20 can be increased. As a result, the number of bags 10 manufactured per unit time can be increased. That is, by using the water-permeable member 20 in which a plurality of fibers such as the first fiber 23 and the second fiber 24 are laminated, the bag-making suitability of the bag 10 can be improved.

Preferably, as described above, the water permeable member 20 is heat-fixed. As a result, when the water permeable member 20 is heated in the manufacturing process of the bag 10, it is possible to prevent the water permeable member 20 from being deformed such as shrinking.

Method of using the bag Next, an example of the method of using the bag 10 described above will be described.

First, the upper portion 11 of the bag 10 is opened along the easy-opening means 17. Subsequently, as shown in FIG. 7, water 27 is injected into the bag 10 from the upper portion 11 to immerse the content 18 in the first space 16a in water. At this time, the water 27 may pass through the water permeable member 20 and reach the second space 16b.

After the contents 18 are restored with water 27, the lower portion 12 of the bag 10 is opened along the easy-opening means 17. Further, as shown in FIG. 8, the posture of the bag 10 is maintained in a state where the lower portion 12 is located below. As a result, the water 27 passes through the water permeable member 20 and is discharged from the lower portion 12. FIG. 9 is a diagram showing a bag 10 after the water 27 has been discharged.

Here, in the present embodiment, since the water permeable member 20 is formed by laminating a plurality of fibers such as the first fiber 23 and the second fiber 24, the opening ratio of the water permeable member 20 is high. ing. Therefore, the water 27 can quickly permeate the water permeable member 20 due to its own weight.

It is possible to make various changes to the above-described embodiment. Hereinafter, a modified example will be described with reference to the drawings. In the following description and the drawings used in the following description, the same codes as those used for the corresponding parts in the above-described embodiment will be used for the parts that can be configured in the same manner as in the above-described embodiment. Duplicate explanations will be omitted. Further, when it is clear that the action and effect obtained in the above-described embodiment can be obtained in the modified example, the description thereof may be omitted.

(First modification)
In the above-described embodiment, an example is shown in which the water-permeable member 20 is inserted between the front surface film 14 and the back surface film 15 in a state where the folded-back portion 20c is folded back so as to be located above. However, as shown in FIG. 10, the water permeable member 20 may be inserted between the front surface film 14 and the back surface film 15 in a folded state so that the folded portion 20c is located downward.

(Second modification)
In the above-described embodiment, an example is shown in which the water permeable member 20 is located closer to the lower portion 12. In this modified example, an example in which the water permeable member 20 is located closer to the upper portion 11 will be described. FIG. 11 is a front view showing the bag 10 in this modified example. Further, FIG. 12 is a cross-sectional view showing a case where the bag shown in FIG. 11 is viewed along the line XII-XII.

As shown in FIGS. 11 and 12, the bag 10 according to this modification is in a state of being folded so that the folded portion 28c is located upward in addition to the above-mentioned front surface film 14, back surface film 15, and water permeable member 20. A lower film 28 inserted between the front surface film 14 and the back surface film 15 is further provided. The lower film 28 is located below the water permeable member 20, and the lower portion 12 of the bag 10 is sealed by the lower film 28. For example, as shown in FIG. 13, the lower film 28 is joined to the inner surface 14x of the front surface film 14 and the inner surface 15x of the back surface film 15 by the lower sealing portion 28a. The lower seal portion 28a may be formed by welding the lower film 28, the inner surface 14x of the front surface film 14 and the inner surface 15x of the back surface film 15, or may be formed by an adhesive or the like.

FIG. 13 is a diagram showing an example of how to use the bag 10 according to this modification. Here, an example in which the content 18 is restored by bringing the water vapor generated from the water 27 into contact with the content 18 instead of immersing the content 18 in the water 27 will be described. That is, in this modification, the bag 10 functions as a steamer that brings water vapor into contact with the content 18 to increase the water content of the surface portion of the content 18. In this case, examples of the content 18 include shumai, meat buns, and the like. The contents 18 may be stored in the bag 10 in advance, or may be put inside the bag 10 by the consumer after the consumer opens the bag 10 at the upper portion 11.

In this modification, the water 27 is injected into the first space 16a of the bag 10 from the opened upper portion 11 and permeates through the water permeable member 20 to reach the second space 16b. The water 27 present in the second space 16b can increase the water vapor pressure inside the bag 10 and restore the contents 18. Further, since the opening ratio of the water permeable member 20 is high, the water 27 can quickly permeate the water permeable member 20 and reach the second space 16b.

Although not shown, in the bag 10 provided with the lower film 28, the water permeable member 20 may be located closer to the lower portion 12 instead of closer to the upper portion 11.

Although some modifications to the above-described embodiments have been described, it is naturally possible to apply a plurality of modifications in combination as appropriate.

Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the description of the following Examples as long as the gist of the present invention is not exceeded.

(Example 1)
The water-permeable member 20 shown in FIG. 5 was prepared by laminating the first fiber 23, the second fiber 24, and the third fiber 25 so as to intersect each other so that the opening ratio was 70%. The width and spacing of each fiber are as follows.
・ Width W1 0.5 mm of the first fiber 23
-Width of the second fiber 24 W2 0.5 mm
-Width of the third fiber 25 W3 0.25 mm
・ First interval P15 mm
・ Second interval P25 mm
・ Third interval P35 5mm

Next, the tensile strength of the water permeable member 20 at a width of 50 mm was measured. As a result, the tensile strength was 109N.

Next, the bag 10 shown in FIG. 1 was manufactured using the water-permeable member 20. At this time, since the water-permeable member 20 has a high elasticity, the transport speed of the water-permeable member 20 can be increased, and the bag-making suitability of the bag 10 can be improved. Further, when the water permeable member 20 was heated, no deformation such as wrinkles or wrinkles occurred due to the water permeable member 20.

Further, the upper portion 11 of the bag 10 provided with the water permeable member 20 was opened, and only water was injected into the inside of the bag 10. Then, the lower part 12 of the bag 10 was opened to drain water. The time required to drain the water was 3 seconds. The area of the water-permeable member 20 of the bag 10 through which water could permeate (the area other than the sealed part) was 24 cm ² . The volume of water injected into the bag 10 was 500 mL.

(Comparative Example 1)
Measurement of the tensile strength of the water permeable member 120, as in the case of Example 1, except that the water permeable member 120 shown in FIG. 14 was used in which the holes 126 were formed so that the opening ratio was 3%. The bag was manufactured and the water discharge time was measured. As a result, the tensile strength of the water permeable member 120 at a width of 50 mm was 24 N. Therefore, the transport speed of the water-permeable member 120 could not be increased, and the bag-making suitability was insufficient. The time required to discharge the water was 45 seconds.

10 Bag 11 Upper 11a Upper seal 12 Lower 12a Lower seal 13 Side 13a Side seal 14 Surface film 14x Inner surface 14y Outer surface 15 Back surface film 15x Inner surface 15y Outer surface 16a First space 16b Second space 17 Easy opening means 18 Contents Object 20 Water permeable member 20a 1st end 20b 2nd end 20c Folded part 21 1st joint 22 2nd joint 23 1st fiber 24 2nd fiber 25 3rd fiber 26 Opening 27 Water 28 Lower film 30 Chuck Tape 31 First fitting part 32 Second fitting part 36 Sealant layer 37 Base material layer P1 First interval P2 Second interval

Claims (4)

It ’s a bag,
The surface film constituting the surface of the bag and
The back film forming the back surface facing the front surface and the back surface film
A water-permeable member having water permeability and fixed to the inner surface of the front surface film and the inner surface of the back surface film so as to vertically partition the space inside the bag.
The water-permeable member has at least a plurality of first fibers extending linearly and a plurality of second fibers extending linearly so as to intersect the first fibers, and the water is permeable by its own weight. It has water permeability that allows the members to pass through,
The permeable member may further have a third fiber extending linearly so as to intersect the first fiber and said second fiber,
A bag in which the angle formed by the third fiber with respect to the first fiber is 5 ° or more and 10 ° or less. The first spacing between the first fibers is 0.5 mm or more and 5.0 mm or less.
The bag according to claim 1, wherein the second spacing between the second fibers is 0.5 mm or more and 5.0 mm or less. The bag according to claim 1 or 2, wherein the water-permeable member has an opening ratio of 30% or more and 70% or less. The bag according to any one of claims 1 to 3 , wherein the third fiber is laminated on the first fiber and the second fiber.

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