Sheet-formed container

Abstract

To provide a sheet-formed container which has a liquid-absorbent layer provided on the inside, and the absorption speed of water and oil in the liquid-absorbent layer is increased therefore spilling from the container is prevented.SOLUTION: In a sheet-formed container, a liquid-absorbent layer 10b and a non-liquid-absorbent layer 10a are bonded to each other by extrusion sand lamination via an adhesive layer 10c, and the liquid-absorbent layer 10b contains fibers with a hollow structure, and the contact angle of the adhesive surface between the liquid-absorbent layer 10b and the adhesive layer 10c with water is 90° or less. The adhesive surface is hydrophilic, and the texture of the fibers of the liquid-absorbent layer 10b is transferred to the adhesive surface by extrusion sand lamination, thus inducing capillary phenomenon, so that the broth from food is not prevented from being absorbed and permeated into the liquid-absorbent layer 10b. This, combined with the fact that the fibers constituting the liquid-absorbent layer 10b generally have a hollow structure that is excellent in water absorption and hygroscopicity, improves liquid absorption speed.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a sheet-formed container suitable for storing food, a sheet material for forming the sheet-formed container, and a method for producing the sheet material. [Background technology]

[0002] 2. Description of the Related Art Sheet-formed containers suitable for storing food products are known, which are made by press-forming a sheet material. Such sheet-formed containers are convenient for storing food in small portions in lunch boxes, but because they are mainly made of resin film and have almost no liquid absorption properties, i.e., are non-liquid-absorbent, excess broth from the food (mainly water and oil) is not absorbed and can spill out. As a result, for example, when a lunch box contains multiple sheet-formed containers, broth spilling from one sheet-formed container may seep into an adjacent sheet-formed container, causing problems such as flavor transfer. Also, when the lunch box is tilted while being carried, broth may leak out of the lunch box, soiling the bag carrying the lunch box.

[0003] Therefore, as disclosed in Patent Document 1, a sheet-formed container has been developed in which a liquid-absorbent layer is formed by laminating a nonwoven fabric or the like on the inner surface thereof, that is, a container in which a non-liquid-absorbent layer made of a resin film or the like on the outer surface and a liquid-absorbent layer made of a nonwoven fabric or the like on the inner surface are laminated and bonded together via an adhesive layer. In this way, moisture and oil from the food are absorbed by the liquid-absorbing layer, making it difficult for the food to spill out of the sheet-formed container and reducing the risk of flavor transfer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-247855 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, if it takes a long time for the liquid-absorbing layer formed on the inner surface of the sheet-formed container to absorb moisture, oil, and the like from the food, these may not have been completely absorbed even when the lunch box is carried. In this case, moisture and oil that have not been completely absorbed may spill out of the sheet-formed container, leaving room for improvement in preventing flavor transfer, etc.

[0006] Therefore, the problem to be solved by the present invention is to increase the absorption rate of moisture and oil in a liquid-absorbent layer formed on the inner surface of a sheet-formed container, and to more reliably prevent these from spilling out of the container. [Means for solving the problem]

[0007] As a result of extensive research, the inventors have discovered that in a sheet-formed container, the absorption rate of moisture and oil in the liquid-absorbent layer can be increased by adjusting or controlling the properties of the adhesive surface (interface) between the liquid-absorbent layer and the adhesive layer.

[0008] That is, in order to solve the above-mentioned problems, a sheet-formed container capable of storing food, which is formed from a sheet material in which an absorbent layer having absorbent properties and a non-absorbent layer having non-absorbent properties are laminated, is configured such that the absorbent layer is on the inner surface of the container and the non-absorbent layer is on the outer surface of the container, the absorbent layer and the non-absorbent layer are bonded together via an adhesive layer, the absorbent layer contains fibers having a hollow structure, and the contact angle of the adhesive surface between the absorbent layer and the adhesive layer with water is 90° or less. The contact angle was measured by measuring the static contact angle by the θ / 2 method (hereinafter the same).

[0009] With this configuration, the adhesive surface between the liquid-absorbent layer and the adhesive layer has hydrophilicity, so that the liquid from the food, which is mostly composed of water, is not impeded from being absorbed and permeated into the liquid-absorbent layer, and the absorption speed is increased. Furthermore, since the fibers constituting the liquid-absorbent layer generally have a hollow structure that is excellent in water absorption and moisture absorption, the absorption performance of the liquid-absorbent layer itself is improved. Therefore, the moisture and oil of the food contained in the sheet-formed container are quickly absorbed and are reliably prevented from spilling out of the container.

[0010] Alternatively, in order to solve the above-mentioned problems, in a sheet-formed container capable of storing food, which is formed from a sheet material consisting of a composite layer having an absorbent layer with absorbency and a non-absorbent layer with non-absorbent properties, the absorbent layer of the composite layer forms the inner surface of the container, and the non-absorbent layer of the composite layer forms the outer surface of the container, the absorbent layer and the non-absorbent layer are bonded together by extrusion sandwich lamination (also called sandwich lamination, the same applies below) via an adhesive layer, and the absorbent layer includes fibers with a hollow structure.

[0011] With this configuration, the texture of the fibers constituting the liquid-absorbent layer is transferred to the adhesive surface with the adhesive layer by extrusion sand lamination, making it possible to effectively induce capillary action at the adhesive surface. This helps to improve the absorption rate of the liquid-absorbent layer for moisture, oil, etc. In addition, since the fibers constituting the liquid-absorbent layer generally have a hollow structure that is excellent in water and moisture absorption, the absorption performance of the liquid-absorbent layer itself is also improved.

[0012] Furthermore, by configuring it in this manner, by providing an adhesive layer formed by extrusion sand application, the adhesive layer softens due to heat during hot press molding into the sheet-formed container and is molded into the desired container shape, and then when the temperature returns to room temperature after hot press molding, the adhesive layer solidifies, thereby imparting a certain degree of shape retention to the sheet-formed container. Generally, a sheet-formed container has a liquid-absorbent layer formed on its peripheral wall, so that the broth and the like are also absorbed by the liquid-absorbent layer of the peripheral wall, but the peripheral wall is prone to collapse due to the weight of the broth and the like acting on the peripheral wall, which makes the sheet-formed container prone to deformation. When the sheet-formed container is deformed in this way, the broth and the like absorbed by the liquid-absorbent layer of the collapsed peripheral wall may come into contact with other foods or leak out. In the present invention, the presence of an adhesive layer formed by extrusion sand application gives the sheet-formed container shape retention, making it possible to prevent the peripheral wall from collapsing downward even if the peripheral wall absorbs broth or the like.

[0013] In the sheet-formed container according to the present invention, it is preferable to adopt a configuration in which unevenness that induces capillary action is formed on the adhesive surface between the liquid-absorbent layer and the adhesive layer.

[0014] With this configuration, the unevenness of the adhesive surface causes capillary action to occur, absorbing moisture, oil, and the like, so that these are absorbed more quickly by the liquid-absorbing layer. Therefore, the moisture and oil of the side dishes and ingredients are more reliably prevented from spilling out of the container.

[0015] In the sheet-formed container according to the present invention, it is preferable that the fiber having a hollow structure forming the liquid-absorbent layer is made of cotton, and more preferably, it is made of a cotton nonwoven fabric.

[0016] In this way, cotton is preferable as a fiber having a hollow structure because it is common and easily available, is less expensive than hollow synthetic fibers, and has a smaller impact on the environment.

[0017] The basis weight of the hollow fiber forming the liquid-absorbent layer is 5 g / m 2 From 120 g / m 2 It is more preferable to adopt a configuration in which:

[0018] With this configuration, the material cost of the liquid-absorbent layer can be reduced while the liquid-absorbent layer has excellent liquid-absorbent performance. The basis weight of the hollow fiber is 5 g / m 2 If the basis weight of the fiber having a hollow structure is less than 120 g / m, the thickness of the absorbent layer becomes too small, and the absorbent performance may become insufficient. 2 If it exceeds this value, the thickness of the liquid-absorbing layer will be unnecessarily large, resulting in increased material costs.

[0019] In the sheet-formed container according to the present invention, the liquid-non-absorbent layer preferably has a thickness of 9 μm to 25 μm, and is preferably made of a PET film.

[0020] With this configuration, the material cost of the non-liquid-absorbent layer can be reduced while the layer has excellent heat resistance and strength. PET film is common and readily available, has relatively low cost and excellent heat resistance. If the thickness of the non-absorbent layer is less than 9 μm, the thickness will be too small and the strength will be insufficient, which may cause the sheet-formed container to tear. If the thickness of the non-absorbent layer is more than 25 μm, the thickness will be unnecessarily large, which will increase the material cost.

[0021] In the sheet-formed container according to the present invention, the adhesive layer is preferably made of a resin whose surface has a contact angle with water of 90° or less, and has a thickness of 10 μm to 40 μm.

[0022] By configuring it in this manner, it becomes easy to adjust the contact angle of the adhesive surface with the liquid-absorbent layer to 90° or less with respect to water while reducing the material cost of the adhesive layer, and it is also possible to impart shape stability and stiffness to the sheet-formed container. By using a resin whose surface has a contact angle with water of 90° or less as the resin for the adhesive layer, it becomes easier to adjust the contact angle with water of the adhesive surface of the adhesive layer to the liquid-absorbing layer to 90° or less. If the thickness of the adhesive layer is less than 10 μm, the thickness will be too small, and the shape will not be stable when the sheet material is hot-pressed to form a container, and it will not be possible to give it stiffness, so there is a risk that the shape will be distorted when food is placed inside, for example due to the surrounding walls collapsing. On the other hand, if the thickness of the adhesive layer exceeds 40 μm, the thickness will be greater than necessary, resulting in increased material costs.

[0023] In the sheet-formed container according to the present invention, it is preferable to adopt a configuration in which the contact angle of the adhesive surface between the liquid-absorbent layer and the adhesive layer with respect to water is 5° or more and 80° or less.

[0024] When configured in this manner, the adhesive surface between the liquid-absorbent layer and the adhesive layer has hydrophilicity, and the absorption and penetration of moisture, oil, etc. into the liquid-absorbent layer is not hindered, thereby accelerating the absorption rate, making it an optimal configuration. If the contact angle exceeds 80°, the hydrophilicity of the adhesive surface decreases, which may hinder the absorption of moisture and oil by the liquid-absorbent layer, and it is practically difficult to reduce the contact angle to less than 5°.

[0025] In order to solve the above-mentioned problems, the present invention provides a sheet material consisting of a composite layer having an absorbent layer and a non-absorbent layer, the absorbent layer and the non-absorbent layer being bonded together via an adhesive layer, the absorbent layer including fibers having a hollow structure, and the contact angle of the adhesive surface between the absorbent layer and the adhesive layer with water being 90° or less.

[0026] In order to solve the above-mentioned problems, a method for manufacturing a sheet material consisting of a composite layer having an absorbent layer with absorbent properties and a non-absorbent layer with non-absorbent properties is adopted, which includes the steps of preparing an absorbent sheet containing fibers with a hollow structure and having absorbent properties, and a non-absorbent sheet with non-absorbent properties, and bonding the absorbent sheet that will become the absorbent layer and the non-absorbent sheet that will become the non-absorbent layer via an adhesive layer by extrusion sand lamination. Effect of the Invention

[0027] Since the sheet-formed container etc. according to the invention is constructed as described above, it is possible to increase the absorption rate of moisture, oil, etc. in the liquid-absorbent layer, and to further prevent these from spilling out of the container and transferring flavors, etc. [Brief description of the drawings]

[0028] [Figure 1] FIG. 1 is a perspective view of a sheet-formed container according to an embodiment; [Diagram 2] 1 is a cross-sectional view of a sheet material according to an embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] The sheet-formed container 10 of the embodiment shown in FIG. 1 is suitably used for storing food, and is produced by hot press forming the sheet material 10' of the embodiment shown in FIG. As shown in FIG. 1, a sheet forming container 10 of the embodiment has a bottom wall 11 that is circular in plan view, a peripheral wall 12 that widens and rises from the peripheral edge of the bottom wall 11, and is open upward. The bottom wall 11 of the sheet forming container 10 is flat, and the peripheral wall 12 has a large number of wrinkles 12a formed all around the circumference thereof, extending in the vertical direction. The sheet-forming container 10 is capable of storing food from above in a storage space defined by a bottom wall 11 and a peripheral wall 12.

[0030] The dimensions of the sheet-formed container 10 are not particularly limited, but examples of suitable dimensions for storing food such as side dishes in a lunch box include an opening diameter of 30 to 120 mm, a diameter of the bottom wall 11 of 30 to 100 mm, and a height (side length) of 15 to 70 mm. The shape of the bottom wall 11 is not limited to the illustrated circular shape in plan view, but may be an ellipse, an oval, a rectangle, a polygon such as a triangle, or the like. Furthermore, the shape of the peripheral wall 12 is not limited to the one extending from the bottom wall 11 as shown in the drawing, but may extend substantially perpendicular to the bottom wall 11, for example. The manner in which the wrinkles 12a of the peripheral wall 12 are formed is not limited to that shown in the figure. For example, if the bottom wall 11 has an elliptical shape in a plan view, the wrinkles may be formed only in the rounded corners. The sheet-forming container 10 may have elements other than the bottom wall 11 and the peripheral wall 12, such as a flange.

[0031] As shown in FIG. 2, the sheet material 10′ of the embodiment is formed by laminating and bonding a non-absorbent layer 10a having a non-absorbent property and a liquid-absorbent layer 10b containing fibers having a hollow structure and having a liquid-absorbent property via an adhesive layer 10c. The manufacturing method for this embodiment of the sheet material 10' includes the steps of preparing a non-absorbent sheet and a liquid-absorbent sheet, and bonding the non-absorbent sheet and the liquid-absorbent sheet together by extrusion sand lamination (the non-absorbent sheet becomes the non-absorbent layer 10a, the liquid-absorbent sheet becomes the liquid-absorbent layer 10b, and an adhesive layer 10c is interposed between them). The sheet material 10' is punched into a desired shape, and then is heat-press molded, either one by one or in a state where multiple sheets are stacked together, using a conventional mold to form the sheet-molded container 10.

[0032] In the sheet-formed container 10, the liquid-absorbent layer 10b forms the inner surface of the container, and the liquid-non-absorbent layer 10a forms the outer surface of the container. The contact angle of the adhesive surface between the liquid-absorbent layer 10b and the adhesive layer 10c with respect to water is 90° or less, preferably between 5° and 80°, and is therefore highly hydrophilic. Such a contact angle can be achieved by adjusting the materials of the adhesive layer 10c and the liquid-absorbing layer 10b, the state of adhesion by changing the adhesion conditions, and the like. Furthermore, since the liquid-absorbent layer 10b and the adhesive layer 10c are laminated and bonded together by extrusion sand lamination, minute irregularities are formed on the adhesive surface of the adhesive layer 10c due to the transfer of the texture of the liquid-absorbent layer 10b. Therefore, the adhesive surface as an interface is in a state where capillary action can be effectively exerted. Therefore, due to the synergistic effect of this capillary phenomenon and the absorbency of the liquid-absorbent layer 10b itself, water and oil from broth and other liquids released from foods stored in the sheet-formed container 10 are quickly absorbed by the liquid-absorbent layer 10b, preventing them from spilling out of the container or transferring their flavors to other foods.

[0033] The material of the non-liquid-absorbent layer 10a is not particularly limited, but resin films are preferable as those with particularly good liquid-absorbency, and examples of such films include various biodegradable resin films such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), polystyrene (PS), nylon (NY), and polylactic acid (PLA). Of these, PET film or PBT film is preferable because of its good heat resistance. In addition, in order to reduce carbon dioxide emissions, these films may contain biomass resin derived from living organisms. The thickness of the non-liquid-absorbent layer 10a is not particularly limited, but is preferably 9 to 25 μm, more preferably 11 to 15 μm, so as to avoid a thickness that is too thin and therefore insufficient in strength, or a thickness that is too thick and therefore expensive. The non-liquid-absorbent layer 10a may be printed to improve the design of the sheet-formed container 10. The type of ink for the printed layer is not particularly limited, but biomass ink or biodegradable ink may be used as ink that has a small environmental impact. Not only the ink but also the PET film can be made to contain biomass resin derived from living organisms, making it possible to reduce the burden on the environment.

[0034] The liquid-absorbent layer 10b is excellent in water absorption and hygroscopicity due to the hollow-structured fibers that compose it, and therefore has good absorption of broth and the like from food contained in the sheet-formed container 10. As long as the liquid-absorbent layer 10b is made of hollow-structured fibers, it is not limited to nonwoven fabrics, woven fabrics, knitted fabrics, and the like, but nonwoven fabrics are preferred as they are bulky and have particularly excellent liquid absorption properties. The fiber having a hollow structure is not particularly limited, and examples include natural fibers such as cotton and synthetic fibers such as hollow irregular cross-section polyester. Cotton is preferred as it is common, easily available, has a lower cost than synthetic fibers, and has a smaller environmental impact, and cotton nonwoven fabric is particularly preferred. When a fiber having a hollow structure is selected as the liquid-absorbent layer 10b, its basis weight is not particularly limited. However, it is preferable that the basis weight is 5 g / m2 or less so that the layer is not too thin and thus has insufficient liquid absorption properties, or is not too thick and thus costs are increased.2 From 120 g / m 2 and preferably 20 g / m 2 From 50 g / m 2 It is more preferable that:

[0035] The material of the adhesive layer 10c is not particularly limited, but examples of materials that can easily adjust the contact angle of the adhesive surface with the liquid-absorbent layer 10b to 90° or less based on the contact angle of the material itself with water include polyethylene terephthalate (PET), polyethylene (PE), polystyrene (PS), polyvinylidene chloride (PVDC), and polyvinyl chloride (PVC). On the other hand, polypropylene (PP) and the like are generally not suitable as materials for the adhesive layer 10c because it is difficult to adjust the contact angle of the adhesive surface with the liquid-absorbent layer 10b to 90° or less due to the contact angle of the material itself with water. However, this is not limited to polypropylene, and even if the contact angle with water exceeds 90°, it is possible to adjust the contact angle to 90° or less by mixing in a modifier or other resin that changes the contact angle. The thickness of the adhesive layer 10c is not particularly limited, but is preferably 10 μm to 45 μm, and more preferably 15 μm to 25 μm, so as to avoid a thickness that is too thin and results in insufficient shape stability during molding, and a thickness that is too thick and results in increased costs. In order to improve the design of the sheet-formed container 10, the adhesive layer 10c may also serve as a printing layer. EXAMPLES

[0036] The present invention will be more clearly described below with reference to examples and comparative examples. As the sheet materials of Examples 1 to 4 and Comparative Examples 1 to 7, the materials shown in Table 1 were prepared. In Examples 1 to 4 and Comparative Examples 4 to 6, the sheet materials were laminated and integrated by sand lamination. In Table 1, PTFE means polytetrafluoroethylene.

[0037] [Table 1]

[0038] Of these sheet materials of Examples 1 to 4 and Comparative Examples 1 to 7, the contact angle with water was measured by the θ / 2 method for Examples 1 to 4 and Comparative Examples 4, 5 and 6, which have an adhesive surface between cotton as an absorbent layer and an adhesive layer. The results are shown in Table 2. In Examples 1 to 4, the contact angles were all adjusted to be 90° or less, but in Comparative Examples 4 to 6, the contact angles all exceeded 100°.

[0039] [Table 2]

[0040] Next, the sheet materials of Examples 1 to 4 and Comparative Examples 1 to 7 were hot pressed to produce sheet-formed containers having a shape as shown in Fig. 1. The dimensions of the sheet-formed container were an opening diameter of 77 mm, a bottom wall diameter of 45 mm, and a side wall length of 30 mm (vertical height from the bottom wall of 27 mm). In Table 1, the configurations of the sheet materials listed from left to right correspond to the configurations of the inner surface to the outer surface of the sheet-formed container, respectively.

[0041] For the sheet-formed containers of Examples 1 to 4 and Comparative Examples 1 to 7, 1 ml of water was poured onto the inner surface of the bottom wall, and the time it took for the water to be absorbed and spread around the entire circumference of the peripheral wall to the top end of the peripheral wall (water absorption rate) was measured and evaluated. The sheet-formed containers were also observed to evaluate the degree of water absorption and the degree to which the container spread when absorbing water (degree of shape retention). The results are shown in Table 3. The water absorption speed was evaluated as follows: 30 seconds or less was rated as ⊚, more than 30 seconds but less than 1 minute 30 seconds was rated as ◯, and 1 minute 30 seconds or more was rated as ×. The degree of water absorption was evaluated by visual observation, with ◯ being the absence of puddles, △ being the presence of puddles, and × being the absence of significant water absorption or spreading. Regarding the degree of expansion of the container (evaluation of shape retention when absorbing water), the diameter of the container opening was measured before and after absorbing water. When the rate of change in diameter before and after absorbing water was less than 103%, it was evaluated as having almost no change, as ◯; when it was 103% or more but less than 110%, it was evaluated as having expanded slightly, as △; and when it was 110% or more, it was evaluated as having expanded, as ×.

[0042] [Table 3]

[0043] As can be seen from Table 3, in all of Examples 1 to 4, good results were obtained in the tests of water absorption time and water absorption degree, whereas in Comparative Examples 1 to 7, except for Comparative Example 2, good results were not obtained in at least one of the tests of water absorption time and water absorption degree. Furthermore, in all of Examples 1 to 4, good results were obtained in the test of container spreadability (shape retention), whereas in Comparative Examples 1, 2, and 7, good results were not obtained. In particular, in Comparative Example 2, the container is expanded so much, i.e., the side walls are collapsed so much, that even if the water absorption time and state are good, there is a concern that the broth from the food may leak out from the collapsed side walls and transfer the flavor.

[0044] The embodiments and examples disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims, and includes all modifications and alterations within the scope and equivalent meanings. [Explanation of symbols]

[0045] 10 Sheet forming container 10a Non-absorbing layer 10b Liquid absorption layer 10c adhesive layer 10´ Sheet material 11 Bottom wall 12 Surrounding wall 12a wrinkles

Claims

1. A sheet-formed container capable of storing food, which is formed of a sheet material composed of a composite layer having an absorbent layer having a liquid-absorbent property and a non-absorbent layer having a liquid-nonabsorbent property, The liquid-absorbent layer of the composite layer forms an inner surface of the container, and the liquid-non-absorbent layer of the composite layer forms an outer surface of the container, the liquid-absorbent layer and the non-liquid-absorbent layer are bonded to each other via an adhesive layer, The liquid-absorbent layer includes fibers having a hollow structure, The contact angle of the adhesive surface between the liquid-absorbing layer and the adhesive layer with respect to water is 90° or less.

2. A sheet-formed container capable of storing food, which is formed of a sheet material composed of a composite layer having an absorbent layer having a liquid-absorbent property and a non-absorbent layer having a liquid-nonabsorbent property, The liquid-absorbent layer of the composite layer forms an inner surface of the container, and the liquid-non-absorbent layer of the composite layer forms an outer surface of the container, The liquid-absorbent layer and the non-liquid-absorbent layer are bonded to each other by extrusion sand lamination via an adhesive layer, The liquid-absorbent layer comprises fibers having a hollow structure.

3. 3. The sheet-formed container according to claim 1, wherein the adhesive surface between the liquid-absorbent layer and the adhesive layer has projections and recesses that induce capillary action.

4. 3. The sheet-formed container according to claim 1, wherein the fiber having a hollow structure forming the liquid-absorbent layer is cotton.

5. The basis weight of the fiber having a hollow structure is 5 g / m ２ to 120 g / m ２ The sheet-formed container according to claim 1 or 2,

6. 3. The sheet-formed container according to claim 1, wherein the non-absorbent layer has a thickness of 9 μm to 25 μm and is made of a PET film.

7. 3. The sheet-formed container according to claim 1, wherein the adhesive layer is made of a resin whose surface has a contact angle with water of 90° or less and has a thickness of 10 μm to 40 μm.

8. 3. The sheet-formed container according to claim 1, wherein a contact angle of the adhesive surface between the liquid-absorbent layer and the adhesive layer with respect to water is from 5° to 80°.

9. A sheet material comprising a composite layer having a liquid-absorbent layer having a liquid-absorbent property and a non-liquid-absorbent layer having a liquid-non-absorbent property, the liquid-absorbent layer and the non-liquid-absorbent layer are bonded to each other via an adhesive layer, The liquid-absorbent layer includes fibers having a hollow structure, the contact angle of the adhesive surface between the liquid-absorbent layer and the adhesive layer with respect to water is 90° or less; Sheet material.

10. A method for producing a sheet material comprising a composite layer having a liquid-absorbent layer having a liquid-absorbent property and a non-liquid-absorbent layer having a liquid-non-absorbent property, comprising the steps of: A step of preparing an absorbent sheet including fibers having a hollow structure and having absorbency, and a non-absorbent sheet having non-absorbency; and bonding the liquid-absorbent sheet which will become the liquid-absorbent layer and the non-liquid-absorbent sheet which will become the non-liquid-absorbent layer via an adhesive layer by extrusion sand lamination.

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