JP3565996B2 - Dehydration sheet - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a dewatering sheet that can be used for preservation, processing, cooking, and the like of foods such as fish, meat, and vegetables.
[0002]
[Prior art]
Fresh foods such as fresh fish and meat may lose quality during storage, resulting in reduced quality. In some cases, it is required to remove a certain amount of water during the processing and cooking of food. In these cases, recently, a dewatering sheet that comes into contact with the surface of the food and absorbs moisture in the food has often been used.
[0003]
As this dewatering sheet, there is known a sheet in which a high osmotic pressure substance such as syrup is stretched and sandwiched between two semipermeable membranes, and a peripheral portion is sealed (see Japanese Patent Publication No. 1-281616, etc.). ). Semipermeable membranes have the property of permeating water and not penetrating hyperosmotic substances, while hyperosmotic substances have a strong water absorption property and absorb water from the target until the osmotic pressure reaches equilibrium with that of food. Therefore, when the food and the hyperosmotic substance are brought into contact with each other through the semipermeable membrane, moisture from the food permeates through the semipermeable membrane and is absorbed by the hyperosmotic substance, and the hyperosmotic substance is transferred to the food side. Since it does not migrate, the surface or near the surface of the food can be dried without directly touching the hyperosmotic substance.
[0004]
In the above-mentioned dewatering sheet using a hyperosmotic substance, usually, a hyperosmotic substance is applied to one semipermeable membrane to a uniform thickness, and the other semipermeable membrane is superimposed on the semipermeable membrane, and both semipermeable membranes are applied. It is manufactured by heat sealing the periphery of the membrane. However, when applying a high osmotic pressure substance to the semi-permeable membrane, the viscosity greatly affects the workability, and if the viscosity is too high, the application speed is extremely reduced and productivity is deteriorated. Although the productivity is improved, there is a problem that the applied high osmotic pressure substance flows in the sheet, and the applied thickness tends to be uneven.
[0005]
Also, during storage and actual use, since the high osmotic pressure substance is a viscous fluid, it flows even by a slight pressing, and is locally biased in the sheet. In addition, since the hyperosmotic substance has a property of rapidly decreasing its viscosity when it absorbs water, when water is absorbed from food during actual use, the hyperosmotic substance becomes low in viscosity and flows into a concave portion of the sheet. In any case, there is a problem that the high osmotic pressure substance is locally localized in the dewatering sheet due to the pressing and the water absorption, and the dewatering power does not uniformly appear on the entire surface of the sheet.
[0006]
In order to solve these problems on both the production side and the practical use side, various attempts have been made to add a thickener to gel a hyperosmotic substance and adjust the fluidity. Examples thereof include a method of adding an aqueous paste such as sodium alginate to a hyperosmotic substance (Japanese Patent Application Laid-Open No. 1-130730), and a method of adding an inorganic substance such as bentonite to a hyperosmotic substance (Japanese Patent Application Laid-Open No. 6-238163), a method of dispersing microfibers in a substance having a high osmotic pressure (Japanese Patent Laid-Open No. 7-185330), and the like.
[0007]
[Problems to be solved by the invention]
However, since the high osmotic pressure substance to which the above-mentioned various thickeners are added has a very high viscosity and causes a change in viscosity during the process, it is difficult to uniformly apply the semi-permeable membrane with a normal coating apparatus. This was a manufacturing difficulty.
Moreover, even with such a highly viscous dewatered sheet, the viscosity decreases when water is absorbed, so that the problem that the high osmotic pressure substance is localized in the sheet due to water absorption during actual use cannot be sufficiently solved. Was. Furthermore, when the heat sealing at the peripheral portion is incomplete, there is also a problem that a high osmotic pressure substance whose viscosity has decreased due to water absorption leaks in large quantities from the poor sealing portion.
The present invention has been made in order to solve the above-mentioned problems, and therefore, an object of the present invention is to make it easy to manufacture, a high osmotic pressure substance is not biased to a local portion of a sheet by water absorption or pressing, and a defective seal portion. An object of the present invention is to provide a dewatering sheet from which a high osmotic pressure substance hardly leaks.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention relates to a method for manufacturing a osmotic material comprising a semipermeable membrane at least one of which is permeable to water and does not transmit a osmotic material. As described above, there is provided a dewatering sheet that is divided and sandwiched by an ultrasonic seal and sealed at a peripheral edge.
[0009]
It is preferable that the high osmotic pressure material layer is divided by a linear partition formed between the two envelope layers. Alternatively, it is preferable that the high osmotic pressure material layer is divided by a plurality of junctions formed between two outer layers and having an interval of 10 mm or less. Alternatively, the high osmotic pressure material layer is divided by a linear partition having an intermittent portion formed between two outer layers, and the length of the intermittent portion is equal to the length of the entire partition including the intermittent portion. It is preferably set to be 60% or less of the thickness.
[0010]
In any of the above cases, it is preferable that the two jacket layers can be heat-sealed with each other, and that the peripheral edge of the jacket layer be formed by heat sealing.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIGS. 1A and 1B show an example of a dewatering sheet according to claim 2 of the present invention. In FIGS. 1 (a) and 1 (b), the dewatering sheet 10 is basically provided between two outer layers 11a and 11b made of a semi-permeable membrane that is permeable to water and does not transmit a high osmotic pressure substance. A layer 12 of syrup, which is an osmotic substance, is divided and sandwiched in two or more in parallel, and is sealed with a peripheral portion 14.
[0012]
In the dewatering sheet 10, the two outer layers 11a and 11b are each formed of a heat-sealable semi-permeable polyvinyl alcohol film, and the high osmotic pressure material layers 12 are formed of the outer layers 11a and 11b. 11b are divided and sandwiched by partitions 13 made of grid lines formed by ultrasonic sealing. Further, the peripheral portion 14 of the dewatering sheet 10 is sealed by heat-sealing the outer cover layers 11a and 11b with each other.
[0013]
When the dewatering sheet 10 is left in contact with a food that releases moisture, such as fresh food, moisture of the food is absorbed by the hyperosmotic material layers 12 through the semipermeable membrane layer 1a or 1b. Therefore, the food can be brought to a dry state. The high osmotic pressure substance that has absorbed water is reduced in viscosity and increased in fluidity. However, since the outer layers 1a and 1b do not transmit the high osmotic pressure substance and the peripheral portion 14 is sealed, the substance is subjected to external pressure. Also does not leak out of the dewatering sheet 10 and is held in each partitioned frame.
[0014]
Even if the viscosity of the high osmotic pressure substance is reduced due to water absorption during actual use, the dewatering sheet 10 cannot pass through the partition of the seal by the ultrasonic wave . Is not biased toward the local area of the sheet. Also, the thickness of the sheet, since the flow of the hyperosmotic substance is restricted within the individual partitions 13, the substantially initial state is maintained, and a uniform dewatering effect can be exhibited regardless of the shape and weight of the object. . Further, for example, even if there is a poor seal in the peripheral portion 14, the leakage from the poor seal portion is limited to the high osmotic pressure substance in the partition opened due to the poor seal, so that the leakage of the high osmotic pressure substance is caused. The reduction in water absorption is minimized.
[0015]
The dewatering sheet 10 can be manufactured by, for example, the manufacturing process shown in FIG. In the manufacturing process of FIG. 2, a high osmotic pressure substance 2 is applied onto a polyvinyl alcohol film 1a in a square array pattern leaving a grid-like joint using a scraper type liquid reservoir coater 3, and the polyvinyl alcohol is applied from above. The part corresponding to the joint and the part corresponding to the peripheral part 14 of the dewatering sheet 10 were covered with an alcohol film 1b, sealed using an ultrasonic sealing machine 4, and then formed using a cutting machine 5. The outer edge of the peripheral portion 14 is cut.
[0016]
In the dewatering sheet of the present invention, the shape of the partitions 13 shown in the first embodiment is not limited to a grid pattern. In short, it is only necessary to provide a partition that hinders flow so that the hyperosmotic substance is not localized in the local area of the dewatering sheet, so the shape of the partition depends on the size and application of the dewatering sheet, or the required design. Depending on the like, for example, a striped partition 13a shown in FIG. 3 (a), a mesh-shaped partition 13b shown in FIG. 3 (b), a spiral partition 13c shown in FIG. 3 (c), or shown in FIG. 3 (d). An arbitrary pattern such as a polka dot-shaped partition 13d can be used.
[0017]
(Embodiment 2)
FIGS. 4A and 4B show an example of a dewatering sheet according to claim 3 of the present invention. 4 (a) and 4 (b), the dewatering sheet 20 is made of a material having a high osmotic pressure between two jacket layers 21a and 21b made of a semi-permeable membrane, basically like the first embodiment. A certain syrup layer 22 is divided and sandwiched into two or more portions, and is sealed at the peripheral portion 24.
[0018]
In the dewatering sheet 20, the two outer layers 21a, 21b are both made of a polyvinyl alcohol film which is a heat-sealable semipermeable membrane, and the high osmotic pressure substance layers 22 are formed of the outer layers 21a, 21b. 21b are divided by a plurality of joints 23 formed by being sealed by ultrasonic waves. The distance D between the joining points 23 is 10 mm or less, preferably 5 mm or less. Further, the peripheral portion 24 of the dewatering sheet 20 is sealed by heat-sealing the outer cover layers 21a and 21b with each other.
[0019]
The dewatering sheet 20 of the second embodiment can bring the food into a good dry state when it is left in contact with fresh food, as in the first embodiment. The high osmotic pressure substance that has absorbed water has reduced viscosity and increased fluidity, but is prevented from flowing due to the presence of the junctions 23, and does not flow locally to the sheet. In this respect, the distance D between the joining points is more preferably equal to or less than 5 mm.
[0020]
The dewatering sheet 20 of the second embodiment can be manufactured by, for example, the manufacturing process shown in FIG. In the manufacturing process of FIG. 5, the hyperosmotic substance 2 is uniformly applied on the polyvinyl alcohol film 1 a using the T-die 6, and the polyvinyl alcohol film 1 b is covered thereon, and a portion corresponding to the peripheral portion 24 is formed. Is heat-sealed using a heat-sealing machine 4 and then point-welded at, for example, 5 mm intervals using an ultrasonic welding machine (ultrasonic sealing machine) 7 equipped with a horn having a horn tip r of, for example, 0.1 mm. I do. Next, the outer edge of the formed peripheral portion 24 is cut using the cutting machine 5.
[0021]
(Embodiment 3)
FIG. 6A shows an example of a dewatering sheet according to claim 4 of the present invention. In FIG. 6 (a), this dewatering sheet 30 is basically made of syrup, which is a high osmotic substance, between two jacket layers 31a and 31b made of a semipermeable membrane, similarly to the first embodiment. The layers 32 are divided and sandwiched into two or more layers, and are sealed at the peripheral edge portions 34.
[0022]
In the dewatering sheet 30, the two outer layers 31a and 31b are each made of a heat-sealable semi-permeable polyvinyl alcohol film, and the high osmotic pressure material layers 32 are formed of the outer layers 31a and 31b. 31b are divided by linear partitions 33 having intermittent portions 35, which are formed by being mutually sealed by ultrasonic waves . The partitions 33 are arranged in a grid pattern on the entire surface of the dewatering sheet 30, and the length of the intermittent portion 35 in each partition 33 is 60% or less of the entire length of the partition 33 including the intermittent portion 35. ing. The peripheral portion 34 of the dewatering sheet 30 is sealed by heat-sealing the outer cover layers 31a and 31b with each other.
[0023]
The dewatering sheet 30 of the third embodiment can bring the food to a good dry state when it is left in contact with fresh food, as in the first embodiment. The high osmotic pressure-absorbed substance has reduced viscosity and increased fluidity, but is prevented from flowing due to the presence of the linear partitions 33 having the intermittent portions 35, so that the material does not flow locally to the sheet. . From this viewpoint, it has been found through experiments that the length of the intermittent portion 35 should be 60% or less of the entire length of the partition 33 including the intermittent portion 35.
[0024]
The dewatering sheet 30 of the third embodiment can be manufactured by, for example, the manufacturing process shown in FIG. 5, as in the case of the second embodiment. That is, the dewatering sheet 30 of the third embodiment can be manufactured by changing the shape of the horn of the ultrasonic welding machine 7 used in the second embodiment from a dot shape to a linear shape.
[0025]
The shape of the partitions 33 shown in the third embodiment is not limited to a grid pattern. In short, it is only necessary to provide a partition that hinders flow so that the hyperosmotic substance is not localized in the local area of the dewatering sheet, so the shape of the partition depends on the size and application of the dewatering sheet, or the required design. Depending on the like, for example, a maze-shaped arbitrary pattern as illustrated in FIGS. 6B, 6C, 6D, 6E, and 6F may be used.
[0026]
Next, each element of the present invention will be described in detail.
In the dewatering sheet of the present invention, at least one of the two outer layers is formed of a semipermeable membrane that is permeable to water and not permeable to hyperosmotic substances. Such a semipermeable membrane is known, and any of these can be used as long as it can be used in contact with food. Examples of preferred semipermeable membranes include films or sheets of polyvinyl alcohol, cellophane, saponified ethylene-vinyl acetate copolymer, collodion, polyamide, and the like. Further, a laminate film in which two or more kinds of the films are laminated may be used as long as the properties as a semipermeable membrane are maintained. When these are used by being sealed to each other by heat sealing at their respective peripheral portions, it is preferable that the heat sealing surface has heat fusibility.
[0027]
One of the outer layers does not necessarily have to be a semipermeable membrane. When a film that is not a semipermeable membrane is used, any film can be used as long as it is safe when it comes into contact with food and does not transmit a high osmotic pressure substance. Examples thereof include polyethylene, polypropylene, polyester, ethylene-vinyl acetate copolymer, pullulan, cellulose acetate, ethyl cellulose, polyamide and other films, aluminum foil, or a laminate film in which two or more of these are laminated, Alternatively, a material in which a metal such as aluminum is vapor-deposited on any of them can be given. In the case of using these outer layers that are not semipermeable membranes, and in the case of using two outer layers sealed by heat sealing at their respective peripheral portions, the heat-sealed surface has heat-fusibility. Is preferred.
[0028]
If necessary to improve the adhesion to the food and / or the support layer, the outer layer may have an uneven pattern formed by embossing or the like.
[0029]
The high osmotic substance that can be used in the dewatering sheet of the present invention is safe and water-soluble even when it comes into contact with food, and has an osmotic pressure capable of absorbing moisture from the food to be dehydrated. Any one may be used. Examples thereof include hydrates such as monosaccharides, disaccharides, polysaccharides, polyhydric alcohols, low molecular weight organic carboxylic acids, and low molecular weight amino acids. In particular, hydrates of edible sugars such as starch syrup, sucrose, isomerized sugar, glucose, fructose, mannitol, sorbitol, margetol, maltitol, and pullulan, and hydrates of polyhydric alcohols such as glycerin and propylene glycol are preferably used. .
[0030]
If necessary, the hyperosmotic substance may contain an aqueous paste or an inorganic substance. Examples of aqueous pastes that may be used include alginic acid, sodium alginate, propylene glycol alginate, annanic acid, starch, sodium starch phosphate, carrageenan, guar gum, tragacanth gum, locust bean gum, sodium starch glycolate, cellulose glycol Natural polysaccharides and derivatives thereof, such as sodium acid, methylcellulose, and carboxymethylcellulose sodium; natural proteins such as casein, gluten, and gelatin; sodium polyacrylate, polyvinyl alcohol, and synthetic high molecular compounds such as polyethylene oxide. it can. Examples of inorganic substances that can be used include clay, talc, silica powder, bentonite, hectorite, laponite, zeolite, aluminum hydroxide, titanium hydroxide, hydroxyapatite, calcium carbonate, chalk, gypsum powder and the like. These aqueous pastes and inorganic substances have the effect of adjusting the fluidity of the high osmotic substance at the time of water absorption and keeping the distribution of the high osmotic substance in the dewatering sheet in actual use more even.
[0031]
As a method of sandwiching a hyperosmotic substance between two jacket layers, generally, as described in each of the above-described embodiments, a hyperosmotic substance is applied to one film or sheet to be the jacket layer. Then, the peripheral portion and the in-plane divided portion are sealed with a film or sheet serving as the other covering layer.
[0032]
In order to apply the hyperosmotic substance, usually, a method such as continuous extrusion with a T-die, rolling, roll coating, bar coating, knife coating, spraying, or dipping can be appropriately adopted. When joining two jacket layers by heat sealing, if a high osmotic pressure substance is interposed in the heat sealing portion, the joining may be incomplete. In this case, it is particularly preferable to use a liquid reservoir coater having a scraping structure with a scraper capable of intermittently placing a high osmotic pressure substance.
[0033]
It is preferable to use a heat sealing technique for joining the two jacket layers as long as they can be heat sealed such as a polyvinyl alcohol film. Here, as a heat seal, preferably electric heat sealing at the periphery of the jacket layer, the partition is sealed with Rudake thin line can by ultrasonic sealing.
[0034]
When using a material having no heat-sealing property, such as cellophane, it is preferable to use an adhesive, particularly a heat-sensitive adhesive, that is acceptable in the food industry for joining the jacket layers. Alternatively, the joining of the two jacket layers may be performed by physical or mechanical means such as a snap, a clip, and a zipper.
[0035]
As described in the second embodiment, when the hyperosmotic material layer is divided by a plurality of joints, the interval between the joints is set to 10 mm or less, more preferably 5 mm or less. Further, as shown in the third embodiment, in the case where a linear partition having an intermittent portion is used, the length of the intermittent portion is 60% or less of the entire length of the partition including the intermittent portion. In the case of employing these division methods, when the high osmotic pressure substance absorbs water and the viscosity decreases, the flow cannot be completely suppressed, but these joints or partitions have a large flow resistance and are substantially It is possible to prevent the hyperosmotic substance from being unevenly distributed on one side of the dewatering sheet. In addition, when the hyperosmotic substance is divided by a junction or an intermittent partition, some flow of the hyperosmotic substance is allowed through the gap. The high osmotic pressure substance is accumulated thickly in a concave portion or the like where a large amount of oozes out, and has an effect of increasing the dewatering effect.
[0036]
For example, in the final step of the manufacturing process shown in FIG. 2, the dewatering sheet of the present invention forms perforations along the boundaries of the respective peripheral portions 14 without cutting the sheets with the cutter 5. It is also possible to roll the divided strip-shaped linked body of dewatered sheet units into a product. This roll-wound dewatering sheet is easy to store, and can be conveniently separated into arbitrary sizes along perforations when used.
[0037]
Since the dewatering sheet of the present invention can be uniformly dewatered simply by contacting with food, it is advantageously used in a wide range of fields such as preservation, drying, pre-freezing, processing, and cooking of fish, meat, and vegetables. be able to.
[0038]
【Example】
Hereinafter, examples of the present invention will be described.
(Example 1)
The dewatering sheet 10 shown in FIG. 1 was prepared using the manufacturing process shown in FIG. In the dewatering sheet 10 of Example 1, as the coating layers 11a and 11b, a polyvinyl alcohol film (LH25 manufactured by Tosello Corporation, thickness 0.025 mm) was used for both. As the high osmotic pressure substance 12, syrup (Sanfract 550 manufactured by Sanmatsu Kogyo Co., Ltd.) was used.
[0039]
In FIG. 2, a polyvinyl alcohol film 1a having a width of 300 mm is unwound from a roll, and syrup 2 is applied thereon using a scraper-type liquid coating coater 3 to leave a grid-shaped joint having a width of 5 mm, and each side is 40 mm. A square array pattern was formed. The coating thickness was 0.1 mm. Next, a polyvinyl alcohol film 1b having a width of 300 mm is unwound from the roll, covered with the above-mentioned high osmotic pressure material layer, and the heating surface has a square outer frame of 300 mm on a side corresponding to the peripheral portion 14 and a width of 5 mm and a width of 5 mm and an interval of 40 mm. Sealing was performed using an ultrasonic sealer 4 so that a lattice pattern was formed. Next, it was cut along the boundary line of the outer frame by using the cutter 5 to prepare the dewatering sheet 10 of Example 1.
[0040]
When two sheets of the dewatering sheet 10 of Example 1 were prepared, the opening of the fresh horse mackerel was sandwiched between them, and they were lightly pressed by hand so that they adhered well, and allowed to stand at room temperature for 24 hours. A dried dried horse mackerel was obtained overnight. At this time, the viscosity of the sandwiched high osmotic pressure substance was reduced and the fluidity was increased, but was uniformly distributed without uneven distribution in the dewatering sheet 10.
[0041]
(Example 2)
Using the manufacturing process shown in FIG. 5, the dewatering sheet 20 shown in FIG. 4 was prepared. In the same manner as in Example 1, a polyvinyl alcohol film (LH25 manufactured by Tosello Co., thickness 0.025 mm) was used as the outer cover layers 21a and 21b. In addition, as the high osmotic pressure substance 22, syrup (Sanfract 550 manufactured by Sanmatsu Kogyo Co., Ltd.) was used.
[0042]
In FIG. 5, a polyvinyl alcohol film 1a having a width of 300 mm is unwound from a roll, and a high osmotic pressure substance 2 is uniformly applied thereon with a T-die 6 to a thickness of 0.1 mm. I covered it. Next, heat sealing is performed using a heat sealer 4 in which a square outer frame having a side of 300 mm and a width of 5 mm corresponding to the peripheral portion 24 is formed on the heating surface to form the peripheral portion 24. Then, the tip r of the horn is 0.1 mm. After performing point fusion on dot patterns at 5 mm intervals using an ultrasonic fusion machine 7 equipped with a horn, the sheet is cut along the boundary of the outer frame using a cutter 5, and the dewatering sheet of Example 2 is cut. 20 were created.
[0043]
Two dehydrated sheets 20 of Example 2 were prepared and dried overnight for horse mackerel in the same manner as in Example 1. As a result, a good dried horse mackerel without fishy odor was obtained. At this time, the high osmotic pressure material layer in the dewatering sheet 20 flows and changes its thickness along the outer shape of the horse mackerel. However, there is no portion where the high osmotic pressure material layer is lost, and the water absorbing power is maintained over the entire surface. I was
[0044]
(Comparative Example 1)
According to the manufacturing process of Example 2, except that the dot fusion of the dot pattern by the ultrasonic fusion machine 7 was omitted, a conventional dewatering sheet in which the hyperosmotic material layer was not divided was prepared. Using the dewatered sheet of Comparative Example 1, overnight drying of horse mackerel was performed in the same manner as in Example 2. As the viscosity decreased due to water absorption, the high osmotic pressure substance flowed to the lower part of the curved surface of the dewatered sheet, In some parts, dehydration was insufficient, and the dried fishes became fishy and discolored.
[0045]
Comparing the results of Examples 1 and 2 with the results of Comparative Example 1, the present invention in which a hyperosmotic material layer is divided and sandwiched in two or more layers between two jacket layers in parallel. In the dewatering sheet, since the high osmotic pressure substance is not locally localized due to water absorption or pressing, it can be seen that the dehydration power without unevenness can be obtained on the entire surface in actual use.
[0046]
【The invention's effect】
In the dewatering sheet of the present invention, two or more layers of a substance having a high osmotic pressure are divided and sandwiched by an ultrasonic seal between two outer layers, at least one of which is formed of a semipermeable membrane, and sealed at a peripheral portion. Therefore, even if the viscosity decreases due to water absorption during use, or even if it is locally pressed, the high osmotic pressure substance does not flow and is not unevenly distributed, and the dehydration power without unevenness over the entire surface can get. Further, even if the seal at the peripheral portion of the dewatering sheet is defective, the leakage of the high osmotic pressure substance is limited to a local area, and the decrease in the water absorbing power is minimized.
[0047]
If an outer layer that can be heat-sealed is used and the outer peripheral portion of the outer layer is formed by heat sealing, an inexpensive dewatering sheet can be obtained because the production is simple.
[Brief description of the drawings]
FIG. 1A is a plan view and FIG. 1B is a sectional view showing an embodiment of the present invention.
FIG. 2 is a process chart for manufacturing the embodiment.
FIGS. 3 (a), (b), (c) and (d) are plan views of an embodiment in which a partition pattern is different from that of the embodiment.
FIG. 4A is a plan view and FIG. 4B is a sectional view showing another embodiment of the present invention.
FIG. 5 is a process chart for manufacturing the embodiment.
FIGS. 6 (a), (b), (c), (d), (e), and (f) are plan views showing still another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Dehydration sheet 11a, 11b ... Outer layer 12 ... Hyperosmotic substance layer 13 ... Partition 14 ... Peripheral part 20 ... Dehydration sheet 21a, 21b ... Outer layer 22 ... Hyperosmotic substance layer 23 ... Joining point 24 ... Perimeter Part 30... Dewatering sheets 31 a and 31 b... Envelope layer 32... Hyperosmotic substance layer 33... Intermittent linear partition 34.

Claims (5)

At least one layer of a high osmotic pressure substance is divided and sandwiched by an ultrasonic seal between two outer layers made of a semipermeable membrane that is permeable to water and does not transmit a high osmotic pressure substance. A dewatered sheet that is sealed. The dewatering sheet according to claim 1, wherein the layer of the hyperosmotic substance is divided by a linear partition formed between the two outer layers. 2. The dewatering sheet according to claim 1, wherein the layer of the hyperosmotic substance is divided by a plurality of joints formed between the two outer coat layers, and an interval between the joints is 10 mm or less. 3. The layer of hyperosmotic material is divided by a linear partition having an intermittent portion formed between two outer layers, and the length of the intermittent portion is equal to the length of the entire partition including the intermittent portion. The dewatered sheet according to claim 1, wherein the content of the dewatered sheet is 60% or less. The dewatering sheet according to any one of claims 2 to 4, wherein the two jacket layers are heat-sealable to each other, and a peripheral portion of the jacket layer is formed by heat sealing.

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