JP2018052515A - Bag with permeability member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag with permeability and bag-making suitability.SOLUTION: A bag includes a front face film constituting a front face of the bag, a back face film constituting a back face facing the front face, and a permeability member that has permeability and is fixed to an inner face of the front face and an inner face of the back face so as to divide an internal space of the bag vertically. The permeability member includes at least a plurality of first fibers extending linearly and a plurality of second fibers extending linearly so as to intersect with the first fibers. In addition, the permeability member includes a permeability that water is able to penetrate the permeability member by self-weight.SELECTED DRAWING: Figure 1

Description

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

  As a bag for containing contents such as food, a bag made of a soft packaging material is used. For example, patent document 1 is disclosing the bag provided with the water-permeable member which divides the space inside a bag up and down as an example of such a bag. The bag contains dry food that can be reconstituted with water.

  The consumer first opens the top of the bag and then pours water into the bag. After the dried food is restored, the consumer opens the lower part of the bag and discharges water from the lower part through the water permeable member. The water permeable member has a large number of holes for allowing water to pass therethrough.

Japanese Patent No. 4614366

  In order to discharge water quickly, it is preferable that the aperture ratio of the water-permeable member is large. As a method for increasing the aperture 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 any case, the stiffness of the water-permeable member is lowered, and as a result, the suitability for bag production, that is, the suitability for bag making deteriorates.

  The present invention has been made in view of such problems, and an object thereof is to provide a bag having water permeability and bag-making suitability.

  This invention is a bag, Comprising: The surface film which comprises the surface of the said bag, The back film which comprises the back surface which opposes the said surface, Water permeability, Comprising: The space inside the said bag is divided up and down A water permeable member fixed to the inner surface of the front film and the inner surface of the back film, wherein the water permeable member intersects the first fibers with a plurality of first fibers extending linearly. A bag having at least a plurality of second fibers extending linearly and having water permeability that allows water to permeate the water permeable member by its own weight.

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

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

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

  According to the present invention, a bag having water permeability and bag-making suitability can be provided.

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 where the bag shown in FIG. 1 is seen along a III-III line. It is sectional drawing which shows an example of the layer structure of the surface film and back film of a bag. It is a top view which shows the case where the water-permeable member of a bag is expand | deployed. It is a figure which shows a part of manufacturing process of a bag. It is sectional drawing which shows the state which inject | poured water into the bag shown in FIG. It is sectional drawing which shows a mode that water is discharged | emitted from the lower part of a bag. It is sectional drawing which shows the bag after water was discharged | emitted from the lower part of the bag. It is sectional drawing which shows the bag in a 1st modification. It is a front view which shows the bag in a 2nd modification. It is sectional drawing which shows the case where the bag shown in FIG. 11 is seen along a XII-XII line. It is sectional drawing which shows the state which inject | poured water into the bag shown in FIG. It is a front view which shows the water-permeable member of the bag in the form of a comparison.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Note that, in the drawings attached to the present specification, for convenience of illustration and understanding, the scale and vertical / horizontal dimension ratios are appropriately changed and exaggerated from those of the actual ones.

  In addition, as used in this specification, the shape and geometric conditions and the degree thereof are specified, for example, terms such as “parallel”, “orthogonal”, “identical”, length and angle values, etc. are strictly Without being bound by meaning, it should be interpreted including the extent to which similar functions can be expected.

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

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

In the present embodiment, by opening the upper part 11 of the bag 10 and injecting water into the bag 10 from the upper part 11, the contents are absorbed in the bag 10 to restore the contents. It is assumed that the bag 10 is used. “Water” means a liquid containing H ₂ O in a liquid state. The temperature of water is not particularly limited. For example, water may be a liquid at room temperature containing H ₂ O, or a liquid at a high temperature, eg, 80 ° C., containing H ₂ O.

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

  For example, the bag 10 may be sealed and sold by a seal unit described later in a state in which the contents are accommodated. In this case, the consumer opens the bag 10 at the upper part 11 and injects water from the upper part 11 into the bag 10 to restore the contents contained in the bag 10. Moreover, the bag 10 may be sold in a state where a part thereof is opened and the contents are not accommodated. After putting the contents into the bag 10 through the opening, the consumer injects water to restore the contents inside the bag 10. Note that the bag 10 may be sold in a state where the bag 10 is sealed by the seal portion and the contents are not accommodated.

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

  It should be noted that the terms “surface film” and “back film” are merely a section of the sheet constituting the bag 10 according to the positional relationship of the outer surface of the bag 10, and provision of the sheet for manufacturing the bag 10 is provided. The method is not limited by the above terms. For example, the bag 10 may be manufactured using a single film in which a front film 14 and a back film 15 are continuously provided, or manufactured using a single front film 14 and a single back film 15. May be.

  The seal portion is a portion where the inner surface of the front film 14 and the inner surface of the back film 15 are joined. In the plan view of the bag 10 shown in FIG. 1 and the like, the seal portion is hatched. In the present application, the water-permeable member 20 is also hatched in the plan view for convenience. In addition, since the opening part is formed in the water-permeable member 20 so that it may mention later, also in the part in which the water-permeable member 20 is located between the surface film 14 and the back film 15, The inner surface of the back film 15 can be joined.

  As long as the front surface film 14 and the back surface film 15 which oppose can be joined and the bag 10 can be sealed, the method for forming a sealing part is not specifically limited. For example, the seal portion may be formed by melting the inner surface of the front film 14 and the inner surface of the back film 15 by heating and welding the inner surfaces. Or you may form a seal | sticker part by adhere | attaching the inner surface of the surface film 14 and the inner surface of the back film 15 which oppose using an adhesive agent etc.

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

  The water permeable member 20 is a member provided to divide the space inside the bag 10 vertically. In the example shown in FIG. 1, the space inside the bag 10 is formed by the water permeable member 20, the first space 16 a above the water permeable member 20, and the second space 16 b below the water permeable member 20, It is divided into. The “inside of the bag 10” means a space between the front film 14 and the back film 15. As shown in FIG.1 and FIG.2, the water-permeable member 20 is inserted between the surface film 14 and the back film 15 in the state folded so that the folding | returning part 20c may be located upwards.

  FIG. 3 is a cross-sectional view showing the bag 10 shown in FIG. 1 as viewed along line III-III. When the bag 10 is sold in a state where the content 18 is stored in the bag 10, the content 18 is 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. The term “close to the lower part 12” means that the distance from the lower part 12 to the first joint part 21 and the second joint part 22 is smaller than the distance from the upper part 11 to the first joint part 21 and the second joint part 22, respectively. Means. In addition, “close to the upper part 11” described later means that the distance from the upper part 11 to the first joint part 21 and the second joint part 22 is greater than the distance from the lower part 12 to the first joint part 21 and the second joint part 22, respectively. Also means small.

  A part of the surface of the folded water-permeable member 20 that faces the surface film 14 is fixed to the inner surface 14 x of the surface film 14 by the first joint portion 21. The 1st junction part 21 may be the part formed by welding the surface film 14 and the water-permeable member 20, and may be an adhesive agent. Further, a part of the surface of the folded water-permeable member 20 that faces the back film 15 is fixed to the inner surface 15 x of the back film 15 by the second bonding portion 22. The second bonding portion 22 may be a portion formed by welding the back film 15 and the water permeable member 20, or may be an adhesive. Each of the first joint portion 21 and the second joint portion 22 extends from one of the pair of side seal portions 13a to the other.

  The 1st junction part 21 may be formed so that the surface film 14 side edge part (1st edge part 20a) of the water-permeable member 20 of the folded state may be included, and the 1st edge part 20a is included. It may be formed so that there is no. Similarly, the 2nd junction part 22 may be formed so that the edge part (2nd edge part 20b) by the side of the back film 15 of the water-permeable member 20 of the folded state may be included, and 2nd edge part It may be formed so as not to include 20b. For example, the first joint portion 21 is formed so as to include the first end portion 20a and does not include the folded portion 20c, and the second joint portion 22 includes the second end portion 20b and does not include the folded portion 20c. Formed.

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

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

  As a material constituting the sealant layer 36, for example, polyethylene or polypropylene can be used. The thickness of the sealant layer 36 is, for example, not less than 40 μm and not more than 160 μm.

As a material constituting the base material layer 37, for example, polyethylene terephthalate, plastic such as polypropylene or nylon, paper, or the like can be used. The base material layer 37 has high heat resistance required when forming the seal portion by thermal welding. When the base material layer 37 is a plastic, it may be uniaxially or biaxially stretched. Further, the base material layer 37 may be provided with a print display for showing product information or imparting aesthetics. Examples of the print display include letters, numbers, symbols, figures, and patterns. When the base material layer 37 is a 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 for laminating the sealant layer 36 on the base material layer 37 include a melt extrusion method and a dry lamination method. In the melt extrusion method, a material constituting the sealant layer 36 is extruded onto the base material layer 37. In the dry laminating method, the film-like sealant layer 36 and the film-like base material layer 37 are bonded together using an adhesive.

  The thickness of the surface film 14 and the back film 15 is, for example, not less than 40 μm and not more than 220 μm.

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

  As the functional layer, an appropriate layer can be selected according to 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, an inorganic material such as aluminum or a vapor deposition layer of an inorganic oxide such as aluminum oxide or silicon oxide can 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 bag 10. Moreover, in order to provide mechanical strength, you may provide a support body as a functional layer. As the support, the same material 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 not on the surface of the sealant layer 36 and the base material layer 37 but on the surface of the base material layer 37 opposite to the sealant layer 36.

  In addition, it cannot be overemphasized that the layer structure of the surface film 14 and the back surface film 15 is not limited to what was mentioned above. Moreover, the layer structure of the surface film 14 and the layer structure of the back surface film 15 may be the same, and may differ.

(Configuration 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 nonwoven fabric laminated so that a plurality of fibers intersect with 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. A portion of the water permeable member 20 where no fiber such as the first fiber 23 or the second fiber 24 is present becomes an opening 26 through which water can permeate.

The water permeable member 20 has water permeability that allows water to pass through the water permeable member 20 by its own weight. Specifically, the time when water of 25 ° C. permeates 30 ml of water to the area of 2 cm ² of the water permeable member 20 by its own weight is within 2 seconds (after accommodating 30 ml of water in the cylinder) The time required for water to disappear from the cylinder when water is transmitted through the water-permeable member.

  In FIG. 5, reference sign D <b> 1 represents a first direction in which the plurality of first fibers 23 extends, and reference sign D <b> 2 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. The angle formed by the first direction D1 and the second direction D2 is preferably not less than 80 ° and not more than 100 °.

  In FIG. 5, reference symbol P <b> 1 represents an interval (first interval) between two adjacent first fibers 23, and reference symbol P <b> 2 represents an interval (second interval) between two adjacent second fibers 24. ). The first spacing P1 of the first fibers 23 and the second spacing P2 of the second fibers 24, and the width W1 of the first fibers 23 and the width W2 of the second fibers 24 are the opening ratio and strength required for the water permeable member 20. It is set based on. In addition, in this application, the 1st space | interval P1 is the distance between each center of the two 1st fibers 23 adjacent in the direction orthogonal to the 1st direction D1. Similarly, the 2nd space | interval P2 is the distance between each center of the 2nd 2nd fiber 24 adjacent in the direction orthogonal to the 2nd direction D2. Moreover, in this application, the aperture ratio of the water-permeable member 20 is a ratio of the area occupied by the opening part 26 among the areas of the whole 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. Further, 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 fibers 23 and the width W2 of the second fibers 24 are preferably 0.25 mm or more, and more preferably 0.6 mm or more. The width W1 of the first fibers 23 and the width W2 of the second fibers 24 are preferably 1.0 mm or less, and more preferably 0.8 mm or less. Moreover, the aperture ratio of the water-permeable member 20 is preferably 30% or more, and more preferably 50% or more. Moreover, the aperture ratio of the water-permeable member 20 is preferably 70% or less, and more preferably 60% or less. By setting in this way, the water permeable member 20 can have predetermined water permeability and strength.

  Hereinafter, the advantage of the bag 10 provided with the above-mentioned water-permeable member 20 will be described by comparing with a bag according to a comparative form. FIG. 14 is a plan view showing a water permeable member 120 included in a bag according to a comparative embodiment. The water permeable member 120 has a plurality of holes 126 as openings for allowing water to pass therethrough. In this case, when trying to increase the aperture ratio of the water permeable member 120, the size of the holes is increased or the density of the holes is increased. However, when the film-like 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 in the plane of the permeable member 120. It does not occur and occurs intensively around the hole 126. For this reason, when the size of the holes is increased or the density of the holes is increased, the uneven distribution of stress generated in the water-permeable member 120 is further increased, and the stiffness of the water-permeable member 120 is reduced.

  The holes 126 are formed by performing a hole forming process on a flat film constituting the water permeable member 120. The punching process includes a step of pressing a mold provided with a large number of needles against the film. This step is performed with the needle heated. For this reason, a burr | flash generate | occur | produces around the hole 126, As a result, it becomes difficult for water to permeate | transmit the water-permeable member 120. FIG. Moreover, when using a needle | hook, the temperature around the part in which a hole is formed among films becomes locally high compared with another part. In this case, in the process of manufacturing a bag using the water permeable member 120, if the water permeable member 120 is heated again, it is considered that the water permeable member 120 is locally deformed such as shrinkage.

  On the other hand, in this Embodiment, the water-permeable member 20 is comprised by laminating | stacking so that the 1st fiber 23 and the 2nd fiber 24 may cross | intersect. For this reason, when the water-permeable member 20 is pulled or bent, the uniformity of the distribution of stress generated in the water-permeable member 20 can be increased, and the stiffness of the water-permeable member 20 can be increased.

  The first fibers 23 and the second fibers 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. Thereby, when the water-permeable member 20 is heated in the subsequent manufacturing process of the bag 10, it is possible to prevent the water-permeable member 20 from being deformed such as contraction.

  Preferably, the width W1 and the first interval P1 of the plurality of first fibers 23 are uniform, and similarly, the width W2 and the second interval P2 of the plurality of second fibers 24 are also uniform. Thereby, the distribution of the stress generated in the water permeable member 20 can be made uniform. In other words, stress can be prevented from concentrating on a part of the water permeable member 20. For this reason, it can suppress that a water permeable member 20 deform | transforms. “Uniform” means that the standard deviation calculated by measuring the dimensions of a plurality of objects is not more than a predetermined value. For example, for 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 locations is 0.2 mm or less. Similarly, for the first interval P1 of the first fibers 23, the width W2 of the second fibers 24, and the second interval P2, “uniform” means that the standard deviation calculated by measuring the dimensions at 10 locations is 0.2 mm or less. It 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 locations, the measured values are 1.645 mm, 1.645 mm, 1.548 mm, 1.527 mm, 1 591 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 in which the third fibers 25 extend intersects both the first direction D1 and the second direction D2. The angle which the 3rd fiber 25 makes with respect to the 1st fiber 23 is 5 degrees or more and 10 degrees or less, for example. In addition, as will be described later, the first direction D1 in which the first fibers 23 extend may coincide with the transport direction T in which the water permeable member 20 is transported when the bag 10 is manufactured. By providing such third fibers 25, the strength of the water permeable member 20 can be further increased.

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

  As a material constituting the first fiber 23, the second fiber 24, and the third fiber 25, polyolefin such as polyethylene and polypropylene can be used. In addition, the material which comprises the 1st fiber 23, the 2nd fiber 24, and the 3rd fiber 25 may be the same, and may differ.

  When the water permeable member 20 is a nonwoven fabric laminated so that a plurality of fibers intersect, the tensile strength at a 50 mm width when measured in accordance with ASTM D882 can be set to 100 N or more and 300 N or less.

(Other components)
The bag 10 may be provided with easy-opening means 17 for easily breaking the bag 10 and opening the bag 10. The easy-opening means 17 may be formed in the upper part of the bag 10 or may be formed in the lower part 12 of the bag 10. In the example shown in FIG. 1, easy-opening means 17 is provided on both the upper part 11 and the lower part 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 crosses the first space 16 a 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 at the upper part 11 side along the easy opening means 17, and water can be injected into the bag 10, and then the bag 10 can be sealed again by the upper part 11.

Method for producing a bag Next, an example of a method of manufacturing the bag 10 described above.

  First, the long surface film 14, the back film 15, and the water-permeable member 20 are prepared. Subsequently, as illustrated in FIG. 6, the water permeable member 20 in a state of being folded by the folded portion 20 c is disposed between the inner surface 14 x of the front film 14 and the inner surface 15 x of the back film 15. Moreover, the elongate surface film 14, the back film 15, and the water-permeable member 20 are each conveyed along the conveyance direction T. The conveyance direction T corresponds, for example, to the first direction D1 in which the first fibers 23 of the water permeable member 20 extend. For example, the angle formed by the first direction D1 and the transport direction T is not less than 0 ° and not more than 10 °.

  Subsequently, the inner surface 14x of the surface film 14 and the inner surface 15x of the back film 15 are partially heated to form the lower seal portion 12a and the side seal portion 13a described above, and the surface film 14 and the back film 15 are formed. Link. At this time, a portion of the water permeable member 20 corresponding to the side seal portion 13 a is fixed to the front film 14 and the back film 15. Further, the water permeable member 20 is partially heated through the front film 14 and the back film 15 to form the first joint portion 21 and the second joint portion 22 described above. Fix to the back film 15. Then, the elongate surface film 14, the back film 15, and the water permeable member 20 are cut | disconnected along the side part seal part 13a. In this way, the bag 10 having the front film 14, the back film 15, and the water permeable member 20 and having the upper portion 11 opened can be obtained.

  Thereafter, 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-described 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 configured by laminating a plurality of fibers such as the first fibers 23 and the second fibers 24, the water permeable member 20 has high stiffness. ing. For this reason, when the water-permeable member 20 is pulled in the conveyance direction T in the manufacturing process of the bag 10, deformation such as wrinkles and wrinkles hardly occurs. As a result, the tension applied to the water permeable member 20 can be increased, and therefore the conveyance 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 fibers 23 and the second fibers 24 are laminated, the bag making suitability of the bag 10 can be enhanced.

  Preferably, as described above, the water-permeable member 20 is subjected to a heat setting process. Thereby, when heating the water-permeable member 20 in the manufacturing process of the bag 10, it can suppress that deformation, such as shrinkage | contraction, arises in the water-permeable member 20. FIG.

Using bags Next, an example of how to use the bag 10 described above.

  First, the upper part 11 of the bag 10 is opened along the easy opening means 17. Subsequently, as shown in FIG. 7, water 27 is poured into the bag 10 from the upper part 11 to immerse the contents 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 by the water 27, the lower part 12 of the bag 10 is opened along the easy-opening means 17. Moreover, as shown in FIG. 8, the attitude | position of the bag 10 is maintained in the state in which the lower part 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 shows the bag 10 after the water 27 has been discharged.

  Here, in the present embodiment, since the water permeable member 20 is configured by laminating a plurality of fibers such as the first fibers 23 and the second fibers 24, the aperture ratio of the water permeable member 20 is increased. ing. For this reason, the water 27 can permeate | transmit the water-permeable member 20 rapidly with the dead weight.

  Note that various modifications can be made to the above-described embodiment. Hereinafter, modified examples will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as in the above embodiment. A duplicate description is omitted. In addition, when it is clear that the operational effects 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, the example in which the water permeable member 20 is inserted between the front film 14 and the back film 15 in the state where the folded portion 20c is folded upward is shown. However, as shown in FIG. 10, the water permeable member 20 may be inserted between the front film 14 and the back film 15 in a state where the folded portion 20c is folded back.

(Second modification)
In the above-described embodiment, an example in which the water permeable member 20 is located closer to the lower portion 12 has been described. In this modification, 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 the present modification. Moreover, FIG. 12 is sectional drawing which shows the case where the bag shown in FIG. 11 is seen along a XII-XII line.

  As shown in FIGS. 11 and 12, the bag 10 according to the present modified example is folded so that the folded portion 28 c is positioned in addition to the surface film 14, the back film 15, and the water permeable member 20 described above. The lower film 28 inserted between the front film 14 and the back 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 film 14 and the inner surface 15x of the back film 15 by the lower seal portion 28a. The lower seal portion 28a may be formed by welding the lower film 28 to the inner surface 14x of the front film 14 and the inner surface 15x of the back film 15, or may be formed of an adhesive or the like.

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

  In this modification, the water 27 is injected into the first space 16a of the bag 10 from the unsealed upper part 11, passes through the water permeable member 20, and reaches the second space 16b. The water 27 existing in the second space 16b can increase the water vapor pressure inside the bag 10, and the contents 18 can be restored. Moreover, since the aperture ratio of the water-permeable member 20 is high, the water 27 can permeate | transmit the water-permeable member 20 rapidly, and can reach the 2nd space 16b.

  Although not shown, in the bag 10 including the lower film 28, the water permeable member 20 may be positioned closer to the lower portion 12 than the upper portion 11.

  In addition, although some modified examples with respect to the above-described embodiment have been described, naturally, a plurality of modified examples can be applied in combination as appropriate.

  EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited to description of a following example, unless the summary is exceeded.

Example 1
A water-permeable member 20 shown in FIG. 5 was prepared in which the first fiber 23, the second fiber 24, and the third fiber 25 were laminated so that the opening ratio was 70%. The width and interval of each fiber are as follows.
・ Width W1 of the first fiber 23 0.5 mm
・ Width W2 of the second fiber 24 0.5 mm
・ Width W3 of the third fiber 25 0.25 mm
・ First interval P1 5mm
・ Second interval P2 5mm
・ 3rd interval P3 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 stiffness, the conveyance 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, deformation such as wrinkles and wrinkles did not occur.

Moreover, the upper part 11 of the bag 10 provided with the water-permeable member 20 was opened, and only water was injected into the bag 10. Then, the lower part 12 of the bag 10 was opened and water was discharged. The time required to drain the water was 3 seconds. In addition, the area (area other than the part sealed) of the part which can permeate | transmit water among the water-permeable members 20 of the bag 10 was 24 cm < ² >. The volume of water injected into the bag 10 was 500 mL.

(Comparative Example 1)
The measurement of the tensile strength of the water-permeable member 120 was performed in the same manner as in Example 1, except that the water-permeable member 120 shown in FIG. 14 in which the hole 126 was formed so that the aperture ratio was 3% was used. Production of the bag and water discharge time were measured. As a result, the tensile strength at 50 mm width of the water permeable member 120 was 24N. For this reason, the conveyance speed of the water-permeable member 120 could not be increased, and bag-making suitability was insufficient. Further, the time required for discharging the water was 45 seconds.

DESCRIPTION OF SYMBOLS 10 Bag 11 Upper part 11a Upper seal part 12 Lower part 12a Lower seal part 13 Side part 13a Side part seal part 14 Surface film 14x Inner surface 14y Outer surface 15 Back 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 First end portion 20b Second end portion 20c Folded portion 21 First joint portion 22 Second joint portion 23 First fiber 24 Second fiber 25 Third fiber 26 Opening portion 27 Water 28 Lower film 30 Chuck Tape 31 First fitting portion 32 Second fitting portion 36 Sealant layer 37 Base material layer P1 First interval P2 Second interval

Claims (4)

A bag,
A surface film constituting the surface of the bag;
A back film constituting a back surface facing the surface;
A water permeable member having water permeability and fixed to the inner surface of the front film and the inner surface of the back film so as to divide the space inside the bag vertically,
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 water is permeable to water by its own weight. A bag having water permeability capable of permeating the member. The first interval between the first fibers is 0.5 mm or more and 5.0 mm or less,
The bag of Claim 1 whose 2nd space | interval between 2nd fibers is 0.5 mm or more and 5.0 mm or less.   The bag according to claim 1 or 2, wherein an aperture ratio of the water-permeable member is 30% or more and 70% or less.   The bag according to any one of claims 1 to 3, wherein the water permeable member further includes a third fiber extending linearly so as to intersect the first fiber and the second fiber.

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