JP3797183B2 - Sugar content up sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sugar content-up sheet used in orchards and the like, and more specifically, excellent laying workability while having a sugar content-up function such as water resistance (water repellency), moisture permeability (breathability) and translucency. It relates to an increased sugar content sheet.
[0002]
[Prior art]
The sugar content up sheet is used as a means to limit the amount of rainwater absorbed by the root by laying so as to surround the root of the fruit tree, and to increase the sugar content of the fruit that bears fruit on the fruit tree by making the fruit tree in a water-deficient state Has been. Since the sugar content increasing sheet has such a sugar content increasing function, it is water resistant (water repellent) that restricts rainwater from reaching the roots of fruit trees, and moisture permeability that maintains bacteria (microorganisms) in the soil in a healthy state ( Air permeability) and translucency.
[0003]
A hemp sheet has been used exclusively for the conventional sugar content increasing sheet. However, since hemp has high water absorption, water resistance is low, and although there is air permeability, there is a problem that microbes harmful to fruit trees are likely to be generated due to lack of translucency. For this reason, recently, synthetic fiber sheets such as polypropylene fibers and polyethylene fibers are often used. However, although the synthetic fiber sheet has excellent sugar content-enhancing functions such as water resistance, moisture permeability, and translucency, when it is replaced with a new sheet when it has deteriorated and has reached the end of its service life, Therefore, there is a problem that the collection work is very time-consuming. Moreover, since the recovered sheet does not rot and cause environmental pollution, there is a problem as industrial waste.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a sugar content-up sheet having excellent laying workability while having a good sugar content-up function such as water resistance, moisture permeability, and translucency. It is in.
[0005]
[Means for Solving the Problems]
The sugar content-enhancing sheet of the present invention that achieves the above object is obtained by laminating at least two types of nonwoven fabrics, a nonwoven fabric A composed of polylactic acid fibers having a fiber diameter of 10 μm or less and a nonwoven fabric B composed of polylactic acid fibers having a fiber diameter of 15 to 50 μm. the laminate interlayer, Ri Do from the configuration and adhere to each other by dispersing a large number of partial fusion part, and moisture permeability of the laminate is 3500~8000g / m ² · 24hr, water resistance is 800 It is 2000 mm .
[0006]
Since the nonwoven fabrics that make up the sugar content-up sheet are all made of polylactic acid fibers, when the new sheet is laid due to weathering deterioration of the used sheet, the deteriorated sheet is not collected and left as it is. Even so, it can be naturally decomposed and eliminated by bacteria in the soil. Accordingly, it is not necessary to collect the deteriorated sheet, and no pollution problem occurs, so that the laying workability can be greatly improved.
[0007]
In addition, since the nonwoven fabric A is made of ultra-fine polylactic acid fibers having a fiber diameter of 10 μm or less, the water resistance function and moisture permeability are increased by densification between the fibers, and the biodegradable synthetic fibers have higher translucency than natural fibers. Since it has, it can have a sugar content increasing function. In addition, since the nonwoven fabric A made of ultrafine fibers is very flexible, it is difficult to perform occasional turning work during laying and intermediate management, but the nonwoven fabric made of highly rigid polylactic acid fibers having a fiber diameter of 15 to 50 μm. By laminating B, workability can be improved.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The sugar content-up sheet of the present invention comprises at least two types of nonwoven fabric, a nonwoven fabric A formed from ultrafine biodegradable polylactic acid fibers and a nonwoven fabric B formed from biodegradable polylactic acid fibers having a relatively large fiber diameter. It is comprised as a laminated body. And between these lamination | stacking of these two types of nonwoven fabrics, it consists of the structure which disperse | distributed many partial melt | fusion parts and mutually adhere | attached.
Among these, the non-woven fabric A is composed of ultrafine fibers, so that densification between the fibers becomes easy, and has a sugar content increasing function that improves water resistance (water repellency), moisture permeability (breathability), and the like.
[0009]
The nonwoven fabric A excellent in water resistance restricts the permeation of rainwater, and when it is placed at the root of a fruit tree as a sugar content-up sheet, it limits the supply of water to the root of the fruit tree and increases the sugar content of the fruit. The nonwoven fabric A that is also excellent in moisture permeability does not transmit water but transmits air. Therefore, the air on the surface side of the sugar content-up sheet is passed through the inner soil surface so that microorganisms in the soil are not killed. Moreover, although it is necessary to give light in order to make microorganisms survive, since the polylactic acid fiber itself is translucent, it can perform its function.
[0010]
In the nonwoven fabric A, the fiber diameter of the polylactic acid fiber which is a constituent fiber is set to 10 μm or less because of the sugar content increasing function. If the fiber diameter is larger than 10 μm, the water resistance deteriorates because it is disadvantageous for densification between fibers. The fiber diameter of the polylactic acid fiber constituting the nonwoven fabric A is preferably as small as possible, more preferably 3 μm or less, and even more preferably 2 μm or less. In order to make it easy to stably obtain such an extremely fine fiber diameter, the nonwoven fabric A is preferably produced by a melt blow method. That is, it is preferably a melt blown nonwoven fabric.
[0011]
On the other hand, the non-woven fabric B has high strength and rigidity by being composed of polylactic acid fibers having a relatively large fiber diameter. By having this characteristic, the nonwoven fabric A with small strength and rigidity is reinforced. Since the nonwoven fabric A is composed of ultra-fine polylactic acid fibers, the nonwoven fabric B is too soft to make the sheet laying operation unstable. However, the nonwoven fabric B serves to eliminate this problem and improve the laying workability. The nonwoven fabric B that performs such an action is preferably manufactured by a spunbond method. That is, a spunbonded nonwoven fabric is preferable.
[0012]
The polylactic acid fiber constituting the nonwoven fabric B has a fiber diameter of 15 to 50 μm, preferably 15 to 40 μm, and more preferably 15 to 30 μm. When the fiber diameter is smaller than 15 [mu] m, and frequently the yarn breakage in the yarn making of spunbonded, with quality becomes non-uniform, it is difficult to increase the strength. On the other hand, if the thickness is larger than 50 μm, the number of reinforcing fibers with respect to the nonwoven fabric A is reduced, so that a sufficient reinforcing action cannot be performed. Therefore, when laying a sugar content up sheet, problems, such as a lot of fluff occurring on the surface, occur.
[0013]
The method of laminating the above-described two types of nonwoven fabrics A and B is not particularly limited. For example, as shown in FIG. The non-woven fabric A may be received by the non-woven fabric A, or the non-woven fabric B may be laminated on the non-woven fabric A. In addition, as shown in FIG. 2, the nonwoven fabric B may be laminated on both the front and back surfaces of the nonwoven fabric A. Moreover, you may make it make the lamination | stacking number of the nonwoven fabric B per single side | surface of the nonwoven fabric A, and it is good to overlap especially the nonwoven fabric B which consists of a fiber from which a fiber diameter differs.
[0014]
As a method for producing a sugar content-up sheet constituted by laminating two types of non-woven fabrics A and B, the non-woven fabric A and the non-woven fabric B are produced in separate steps, and they are laminated and bonded, or Even if the spunbond nonwoven fabric process and melt blown nonwoven fabric process are arranged in order, the nonwoven fabrics that are continuously fabricated are stacked and temporarily bonded while being transported downstream, and finally bonded. Good. It is important to bond the plurality of non-woven fabrics to each other by using an embossing roller so that a large number of partially fused portions are dispersed between the layers . In this way, by interspersing a large number of partially fused portions between the layers, relative movement in the surface direction is partially allowed between the layers to provide flexibility and facilitate the installation work of the sugar content up sheet. Become.
[0015]
FIG. 3 illustrates the process of continuously producing the sugar content-up sheet of the present invention.
[0016]
1 is a spunbond spinning machine, 2 is a melt blow spinning machine, and 3 is a net conveyor. The continuous filament Y discharged from the spunbond spinning machine 1 is developed on the net conveyor 3 together with the jet stream to form a nonwoven fabric B. When this non-woven fabric B is transported by the net conveyor 3 and comes under the melt blow spinning machine 2, the ultra-fine short fiber y injected with hot air from the melt blow spinning machine 2 is developed on the upper surface thereof to form the non-woven fabric A. .
[0017]
The non-woven fabric B and the non-woven fabric A, which are laminated in the upper and lower sides as described above, are fused by a plurality of partial fusion portions when passing through the heated embossing roller 4, and a laminated structure as shown in FIG. Is formed as a roll body R (S).
[0018]
In FIG. 3, two spunbond spinning machines 1 and a melt blow spinning machine 2 are arranged in series. However, when another spunbond spinning machine 1 is arranged in series on the downstream side, as shown in FIG. A sugar content-up sheet S having a simple laminated structure can be produced. Furthermore, if necessary, another spunbond spinning machine or a melt blow spinning machine that discharges fibers having different fiber diameters can be arranged.
[0019]
The non-woven fabrics A and B described above preferably have a basis weight in the range of 15 to 30 g / m ² . In the case of the nonwoven fabric A, if the basis weight is less than 15 g / m ^2, it becomes difficult to maintain the water resistance and moisture permeability necessary for the increased sugar content sheet, and in particular, the fiber diameter of the polylactic acid fiber constituting the nonwoven fabric A is 2 μm or less. If it is difficult. In the case of the nonwoven fabric B, if the basis weight is less than 15 g / m ² , the reinforcing effect on the nonwoven fabric A becomes insufficient. Accordingly, tearing or the like occurs during the laying operation of the sugar content-up sheet, thereby reducing workability.
[0020]
If the basis weight is larger than 30 g / m ^2, the total basis weight of the non-woven fabrics A and B exceeds 60 g / m ² , which makes it difficult to handle when laying the sugar content-up sheet. In particular, as shown in FIG. 2, in the case of an increased sugar content sheet in which the nonwoven fabric B is laminated on both surfaces of the nonwoven fabric A, the total basis weight exceeds 90 g / m ^2, which makes it more difficult to handle and further increases the cost.
[0021]
The apparent densities of the nonwoven fabrics A and B are each preferably 0.2 to 0.5 g / cm ³ , more preferably 0.3 to 0.45 g / cm ³ . When the apparent density of the nonwoven fabric A is smaller than 0.2 g / cm ^3, it becomes difficult to maintain water resistance as a sugar content-up sheet. Moreover, when the apparent density of the nonwoven fabric B is less than 0.2 g / cm ^{3, the} reinforcing effect on the nonwoven fabric A is lowered, and fluff is easily generated on the sheet surface of the nonwoven fabric A. If the apparent density is larger than 0.5 g / cm ³ , the nonwoven fabrics A and B are both film-like, so that the increased sugar content sheet is difficult to handle and the laying workability is lowered.
[0022]
The means for bonding the layers of the nonwoven fabrics A and B with a number of partially fused portions can be easily performed by using an embossing roll. It is preferable that the total area of such partially fused portions between the layers is 7 to 20% of the interlayer area. More preferably, it is 10 to 17%. When the total area of the partially fused parts is less than 7%, the sugar content-up sheet is soft and fluffy. On the other hand, if it is more than 20%, the bending rigidity of the sugar content-up sheet becomes hard and the handleability deteriorates.
[0023]
When a large number of partially fused portions are formed between the nonwoven fabrics with the embossed roll as described above, if the apparent density of each nonwoven fabric is high, adjust each of them separately to the required density with a calender roll, and then When the nonwoven fabrics are laminated and processed with an embossing roll, the fusion can be improved. In addition, in the case of a continuous process in which a spunbond cloth manufacturing process or a melt blown cloth manufacturing process is connected in series as shown in FIG. 3, a calendar roll at the final stage where a plurality of nonwoven fabrics are laminated and before passing through an embossing roll. If the density is adjusted to the required density, the fusion can be improved.
[0024]
In the present invention, it is important that the sugar content-up sheet obtained by laminating the two types of nonwoven fabrics A and B as described above has a moisture permeability of 3500-8000 g / m ² · 24 hr as the sugar content-up sheet. Preferably it is 5000-8000 g / m < ² > * 24hr. By setting the moisture permeability to such a range, microorganisms in the soil can be kept healthy, and microorganisms harmful to fruit trees can be prevented from being generated. More preferably, the air permeability as the increased sugar content sheet is in the range of 0.01 to 10 cc / cm ² · sec, more preferably in the range of 0.01 to 8 cc / cm ² · sec.
[0025]
Moreover, it is important that the water resistance as the sugar content-up sheet is in the range of 800 to 2000 mm, and more preferably 1000 to 1700 mm. By setting to such water resistance (water repellency), the penetration of rainwater can be moderately suppressed, and the sugar content of the fruit can be improved. However, if the water resistance is so large as to exceed 2000 mm, rainwater hardly permeates the sugar content-up sheet , which causes a problem of excessive water deficiency in the fruit.
These moisture permeability and water resistance can be achieved, for example, by producing an increased sugar content sheet by setting the fiber diameter, basis weight, density, etc. of the constituent fibers of each nonwoven fabric to the preferred ranges described above.
[0026]
As the fibers constituting the nonwoven fabrics A and B, it is important to use polylactic acid fibers in particular because they have a good property of being decomposed by microorganisms in the soil .
[0027]
The polylactic acid is preferably a polyester mainly composed of L-lactic acid. “L-lactic acid as a main component” means that 60% by weight or more of the constituents are composed of L-lactic acid, and the rest may be a polyester containing D-lactic acid within a range not exceeding 40% by weight. That is not.
[0028]
The polylactic acid production method includes a two-stage lactide method in which lactide, which is a cyclic dimer, is first produced using lactic acid as a raw material, and then ring-opening polymerization is performed, and direct dehydration condensation in a solvent using lactic acid as a raw material. A one-step direct polymerization process is known. The polylactic acid used in the present invention may be obtained by any production method. In the case of a polymer obtained by the lactide method, since the cyclic dimer contained in the polymer is vaporized during melt spinning and causes thread spots, the cyclic dimer contained in the polymer at a stage prior to melt spinning. The body content is desirably 0.1% by weight or less. Further, in the case of the direct polymerization method, there is substantially no problem due to the cyclic dimer, and therefore, it is more preferable from the viewpoint of yarn production.
[0029]
The polylactic acid used in the spunbond method has a weight average molecular weight of 100,000 to 300,000, more preferably 100,000 to 200,000. If the weight average molecular weight is less than 100,000, the strength of the nonwoven fabric cannot be sufficiently obtained because the fiber strength is lowered. Also, if the weight average molecular weight is greater than 300,000, the filament spun from the die will not be able to be spun at high speed even if sucked and pulled by air soccer, so it will be unstretched yarn-like. High fiber strength cannot be obtained.
[0030]
The polylactic acid used for the melt blown nonwoven fabric has a weight average molecular weight of 150,000 or less, more preferably 30,000 to 100,000, and even more preferably 30,000 to 70,000. When the weight average molecular weight is larger than 150,000, the melting temperature cannot be increased to 240 ° C. or higher due to thermal decomposability when polylactic acid is melted, so that the melt viscosity cannot be lowered by increasing the melting temperature. Therefore, it is not possible to obtain ultrafine fibers having a fiber diameter of 10 μm or less, which are necessary for the nonwoven fabric A. Moreover, when the weight average molecular weight is smaller than 30,000, polymer lump is likely to be mixed when melted and spun from the die, so that the quality may be deteriorated.
[0031]
The polylactic acid used in the present invention may be a copolymerized polylactic acid obtained by copolymerizing other components having ester forming ability in addition to L-lactic acid and D-lactic acid. Examples of copolymerizable components include hydroxycarboxylic acids such as glycolic acid, 3-hydroxybutyric acid, 4-hydroxyvaleric acid, and 6-hydroxycaproic acid, as well as echylene glycol, propylene glycol, butanediol, neopentyglycol, and polyethylene. Compounds having a plurality of hydroxyl groups in the molecule such as glycol, glycerin, pentaerythritol or their derivatives, adipic acid, sebacic acid, fumaric acid, terephthalic acid, isophthalic acid, 2,6-naphthalenecarboxylic acid, 5-sodium sulfo Examples thereof include compounds containing a plurality of carboxylic acid groups in the molecule, such as isophthalic acid and 5-tetrabutylphosphonium isophthalic acid, or derivatives thereof.
[0032]
In order to reduce the melt viscosity, aliphatic polyester polymers such as polycaprolactone, polybutylene succinate, and polyethylene succinate can be used as an internal plasticizer or as an external plasticizer. Furthermore, inorganic fine particles and organic compounds can be added as necessary as matting agents, deodorants, flame retardants, yarn friction reducing agents, antioxidants, coloring pigments and the like.
[0033]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention, each characteristic value used in the Example is calculated | required with the following measuring method.
[0034]
A. Fiber diameter (μm)
Samples are randomly collected from each of the nonwoven fabrics, and the sheet surface of each sample is magnified 1000 to 3000 times and nonwoven fabric B 200 to 300 times by using a scanning electron microscope. The fiber diameter of 20 each [total 100 = 20 * n (= 5)] was measured with calipers, and the average value was calculated.
[0035]
B. Weight per unit (g / m ² )
Three samples of 20 cm × 20 cm were taken from the nonwoven fabric, and the average value of the weights measured for each sample was converted to the mass per 1 m ² .
[0036]
C. Apparent density (g / cm ³ )
Five samples are randomly collected from the nonwoven fabric, and each thickness (mm) is measured under a load of 7 g / cm ² by the dial gauge method defined in JIS L-1096. / M ² ), and the average value of the values for the five samples was calculated.
[0037]
Apparent density = basis weight / (thickness x 1000)
D. Moisture permeability (g / m ² · 24hr)
It was measured by a modified method (30 ° C., 90%) of JIS Z-0208.
[0038]
E. Water resistance (mm)
It was measured by the low water pressure method of JIS L-1902.
[0039]
F. Evaluation of sugar content Ten panelists sampled and compared the fruit using the sugar content-up sheet and the fruit not used. It was considered effective when 7 or more panelists out of 10 judged that the fruit using the sugar content-up sheet had higher sugar content.
[0040]
G. Evaluation of Biodegradation Performance A sample obtained by cutting a sugar-up sheet of 5 cm × 5 cm into a soil at a temperature of 35 ° C. and a moisture of 30% was left to stand for one year, and then the degree of degradation was judged visually.
[0041]
Example 1
Production of nonwoven fabric A:
A raw material was prepared by drying a polylactic acid chip having a weight average molecular weight of 100,000 with a vacuum dryer at a temperature of 120 ° C. for 24 hours. This polylactic acid chip was melt blown at a melt temperature of 230 ° C. and a spinning temperature of 235 ° C. using a melt blown non-woven fabric making facility having a base hole number of 1000 holes / m, and a fiber diameter of 1.5 μm was placed on a net conveyor. Nonwoven fabric A made of fibers was produced. The nonwoven fabric A had a basis weight of 28 g / m ² and an apparent density of 0.14 g / cm ³ .
[0042]
Production of nonwoven fabric B:
A raw material was prepared by drying a polylactic acid chip having a weight average molecular weight of 130,000 for 24 hours with a vacuum dryer at a temperature of 120 ° C. This polylactic acid chip is spunbonded at a melt temperature of 235 ° C. and a spinning temperature of 230 ° C. using a spunbond non-woven fabric making facility with a base hole number of 2500 holes / m, and a fiber having a fiber diameter of 27 μm on a net conveyor. A non-woven fabric B was produced. The nonwoven fabric B had a basis weight of 30 g / m ² and an apparent density of 0.24 g / cm ³ .
[0043]
The two types of nonwoven fabric A and nonwoven fabric B obtained as described above were laminated and passed through an embossing roll having a temperature of 135 ° C. to produce a sugar content-up sheet.
[0044]
The apparent density of the obtained sugar content-up sheet was 0.38 g / cm ³ , and when the water resistance and water vapor permeability were measured, the water resistance was 1580 mm and the water vapor permeability was 6800 g / m ² · 24 hr.
[0045]
In addition, the above-mentioned sugar content-up sheet was used in an orchard for 1 year, and the harvested grapes and the grapes obtained from fruit trees that did not use the sugar content-up sheet in the same grape orchard were sampled by 10 panelists. When they were asked, all of them recognized that the sugar content using the increased sugar content sheet was higher.
[0046]
Further, when the microbial degradability of the increased sugar content sheet was examined, the decomposition was progressing to the extent that most sheets did not retain their original shape.
[0047]
Example 2
The nonwoven fabrics A and B obtained in Example 1 were used to laminate the nonwoven fabric B on both sides of the nonwoven fabric A, and then thermocompression bonded to each other with an embossing roll at a temperature of 135 ° C. to produce a sugar content-up sheet. The apparent density of the obtained sugar content-up sheet was 0.43 g / cm ³ , the water resistance was 1530 mm, and the moisture permeability was 7400 g / m ² · 24 hr.
[0048]
When the sugar content of the persimmon obtained using the above sugar content-up sheet in an orchard was evaluated, it was found that the sugar content was higher than that of fruit trees that did not use this sugar content-up sheet. In addition, there was no occurrence of tearing during construction, and the handleability was excellent, and the workability was satisfactory.
[0049]
Example 3
Using the production apparatus and the raw materials used in Example 1, the fiber diameter of 5 [mu] m, and the nonwoven fabric A having a basis weight is 30 g / m ^2, fiber diameter of 18 [mu] m, basis weight was produced nonwoven B is 30 g / m ^2. Using the obtained non-woven fabrics A and B, a non-woven fabric B was laminated on both surfaces of the non-woven fabric A, and a sugar-up sheet was produced by mutual fusion through an embossing roll having a temperature of 135 ° C. The apparent density of the resulting increased sugar content sheet was 0.33 g / cm ³ , the water resistance was 910 mm, and the moisture permeability was 7800 g / m ² · 24 hr.
[0050]
When the sugar content of the persimmon obtained using the above sugar content-up sheet in an orchard was evaluated, it was found that the sugar content was higher than that of fruit trees that did not use this sugar content-up sheet.
[0051]
Comparative Example 1
Using the manufacturing apparatus and raw materials used in Example 1, a nonwoven fabric A having a fiber diameter of 15 μm and a basis weight of 30 g / m ² and a nonwoven fabric B having a fiber diameter of 24 μm and a basis weight of 25 g / m ² were manufactured. Using the obtained non-woven fabrics A and B, a non-woven fabric B was laminated on both surfaces of the non-woven fabric A, and a sugar-up sheet was produced by mutual fusion through an embossing roll having a temperature of 135 ° C. The apparent density of the resulting increased sugar content sheet was 0.17 g / cm ³ , the water resistance was 320 mm, and the moisture permeability was 8500 g / m ² · 24 hr.
[0052]
When the sugar content of the grapes obtained by using the above sugar content-up sheet in an orchard was evaluated, there was no difference from the fruits of the fruit trees that did not use this sugar content-up sheet, and the effect of increasing the sugar content was not recognized. Moreover, when this sugar content-up sheet was applied to an orchard, fluff was generated, and the workability was not good.
[0055]
【The invention's effect】
As described above, according to the present invention, since the non-woven fabric constituting the sugar content-up sheet is composed of polylactic acid fibers having biodegradability , the sheet in use is weather-resistant and a new sheet is laid. At this time, even if the deteriorated sheet is left as it is without being recovered, it can be decomposed and lost by bacteria (microorganisms) in the soil. Accordingly, it is not necessary to collect the deteriorated sheet, and no pollution problem occurs, so that the laying workability can be greatly improved.
[0056]
In addition, since the non-woven fabric A is made of ultrafine polylactic acid fibers having a fiber diameter of 10 μm or less, the water resistance function and moisture permeability are increased by densification between the fibers, and the polylactic acid fibers have higher translucency than natural fibers. A sugar content increasing function can be provided. In addition, since the nonwoven fabric A made of ultrafine polylactic acid fiber alone is very flexible, it is difficult to sometimes perform turning work during laying work or intermediate management, but from highly rigid polylactic acid fiber having a fiber diameter of 15 to 50 μm. Workability can be improved by laminating the non-woven fabric B.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of an increased sugar content sheet of the present invention.
FIG. 2 is a longitudinal sectional view showing another embodiment of the sugar content-up sheet of the present invention.
FIG. 3 is a schematic view illustrating an apparatus for producing a sugar content-up sheet of the present invention.
[Explanation of symbols]
A Nonwoven fabric A
B Nonwoven fabric B
S Increased sugar content 1 Spunbond spinning machine 2 Melt blow spinning machine 3 Net conveyor 4 Embossed roller

Claims (6)

At least two types of non-woven fabrics, a non-woven fabric A made of polylactic acid fibers having a fiber diameter of 10 μm or less and a non-woven fabric B made of polylactic acid fibers having a fiber diameter of 15 to 50 μm, are laminated, and a number of partially fused portions are formed between the laminated layers. the dispersing Ri Do from the configuration and adhere to one another, and the moisture permeability of the laminate is 3500~8000g / m ² · 24hr, sugar content up sheet characterized by water resistance is 800～2000Mm.   The sugar content-up sheet according to claim 1, wherein the nonwoven fabric A is a meltblown nonwoven fabric, and the nonwoven fabric B is a spunbond nonwoven fabric. The sugar content-up sheet according to claim 1 or 2, wherein the nonwoven fabrics A and B have a basis weight of 15 to 30 g / m ² , respectively. The sugar content-up sheet according to claim 1, 2 or 3, wherein the apparent density of the nonwoven fabrics A and B is 0.2 to 0.5 g / cm ³ , respectively.   The sugar content-up sheet according to any one of claims 1 to 4, wherein the nonwoven fabric B is laminated on both front and back surfaces of the nonwoven fabric A. The sugar content-up sheet according to any one of claims 1 to 5, wherein a ratio of a total area of the partially fused portions to a laminated surface is 7 to 20% .

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