JP5505093B2 - Laminated sheet material with water-absorbing layer used for sweat pad - Google Patents

Description

  The present invention relates to a structure of a laminated sheet material that is a raw fabric for forming a sweat removing pad that is attached to, for example, a garment of a garment and absorbs sweat generated under the armpit.

  Conventionally, sweat pads for underarms have been widely used. When this type of sweat pad is attached to the heel of a garment, the pad can absorb sweat and prevent discomfort under the armpit and sweat stains on the heel of the garment.

  Therefore, as a base material used for a sweat pad, a function that absorbs sweat quickly and does not return the absorbed sweat to the side of the skin is required. Yes. That is, each material is required to have water permeability, water retention, water absorption, etc. depending on its part, and the above functions are exhibited by a combination thereof.

  From such a viewpoint, various materials have been proposed as laminated sheet materials that serve as raw materials for the base material. For example, the sweat removing pad of Patent Document 1 includes a surface layer made of a nonwoven fabric composed of cellulosic fibers, a sweat absorbing layer made of an aggregate containing cellulosic fibers and synthetic fibers, and a waterproof film layer. A base material is used which is laminated and integrated, and the sweat absorption layer is an aggregate in which cellulosic fibers and synthetic fibers are blended at a predetermined ratio.

  Specifically, a water-permeable cotton nonwoven fabric is used as the surface layer, pulp is used as the cellulose fiber having high water retention as the sweat absorption layer, and PE (polyethylene) and PP (polypropylene) have a resilience to bending and the like. It is exemplified that a combination of the two is used in a ratio of about 3: 7 to 7: 3.

  Patent Document 2 is proposed by the present applicant, and is a surface layer that is located on the skin side and has water absorption, an intermediate layer that has higher water permeability and water retention than the surface layer, A pad structure of a base material comprising a back layer having water permeability or poor water permeability is disclosed.

  Specifically, the surface layer corresponds to a mixed fiber of cotton and polyolefin fiber having water absorption and water permeability or water permeability function, and the intermediate layer has higher permeability and water retention than the surface layer. It describes that excellent rayon and hydrophilic PET (polyethylene terephthalate) fibers are applicable.

Japanese Patent Application Laid-Open No. 8-222001 Japanese Patent Application Laid-Open No. 2007-119927

  However, the sweat pad which employs the base material having the above-described structure as a raw fabric uses a material having water absorption or water permeability for the layer in contact with the skin. Although it can be set as a high pad, there exists a problem that the water absorption speed becomes somewhat slow. In addition, the material having the water retention capacity of the lower layer could not realize sufficient water retention ability.

  Furthermore, with the delay in water absorption speed, fuzz occurs on the surface in contact with the skin, and there is also a point that satisfactory satisfaction cannot be obtained.

  The present invention has been invented to solve such conventional problems, and by changing the combination of materials, the absorption speed is further improved while maintaining a smooth feeling, and the amount of water retained is increased to be comfortable. The present invention proposes a laminated sheet material as a raw material for a base material, which can constitute a proper sweat removing pad.

  In order to solve the above-described problems, the present invention has a two-layer structure of a water-absorbing layer laminated sheet material used for a sweat pad, that is, an upper layer in contact with the skin and a lower layer on the clothing side. The part is composed of a nonwoven fabric composed of a mixture of carboxylated cellulose fibers and hydrophilic PET fibers, and the lower layer is composed of a nonwoven fabric composed of rayon fibers. The carboxylated cellulose fibers and hydrophilic PET fibers The blending ratio of was adopted such that the ratio of carboxylated cellulose fiber: hydrophilic PET fiber = 1: 9 to 3: 7.

  This is, as will be described later, the compounding ratio of the carboxylated cellulose fiber and the hydrophilic PET fiber, 10% of the carboxylated cellulose fiber and 90% of the hydrophilic PET fiber, This is because in the evaluation of water absorption performance, the results show that the absorption speed is faster and the water retention is superior than the applicant's conventional products and other companies' products. In addition, increasing the proportion of carboxylated cellulose fibers and decreasing the proportion of hydrophilic PET fibers will result in a ratio of 30% for carboxylated cellulose fibers and 70% for hydrophilic PET fibers. It can be seen that the absorption speed tends to decrease. That is, the absorption speed is also reduced by the reduction in the proportion of hydrophilic PET fibers. Therefore, it is preferable to mix the carboxylated cellulose fiber and the hydrophilic PET fiber in a ratio of approximately carboxylated cellulose fiber: hydrophilic PET fiber = 1: 9 to 3: 7.

In view of the overall basis weight of the water absorbing performance and ^feeling, and ^{55g / m 2 ~95g / m 2} , the ratio of the upper and lower basis weight, the upper layer: lower layer ^{= 11g / m 2: 44g /} m ^{2 ~31.7g /} m ^2: employing means that a ratio of 63.3 g / ^{m 2.}

This is taken as basis weight, the upper layer, cellulose fibers 10% carboxylated functionalized + hydrophilic PET fiber 90% = 15g / ^{m 2,} a total of 75 g / ^{m 2} rayon fiber 100% = 60g / ^{m 2} in the lower layer This is because the test results show that the water absorption performance is superior in absorption speed and water retention compared to the applicant's conventional products and other companies' products. Then, as the basis weight of the ^entire, preferably in the range of ^{55g / m 2 ~95g / m 2} . That is, if the basis weight is less than 55 g / m ² , the minimum water absorption performance required by the pad as a product is affected, and the feeling of use is also changed. On the other hand, the basis weight is 95 g / m ² . If it exceeds, the weight and thickness of the pad will become too large, and the feeling of wearing will change, so that the function as a product can be fully exhibited in the above range. Furthermore, when the basis weight of the upper layer is increased and the basis weight of the lower layer is decreased with the basis weight of the lower limit, wetback occurs near the ratio of upper layer: lower layer = 11 g / m ² : 44 g / m ² , and the fiber itself is weak. It can be seen that there is a clear difference in functionality. In addition, at the upper limit of the weight per unit area, the problem of feeling of use such as wobbling occurs near the ratio of upper layer: lower layer = 31.7 g / m ² : 63.3 g / m ² . Therefore, the ratio of upper and lower basis weight, the upper layer: lower layer ^{= 11g / m 2: 44g /} m 2 ~31.7g / m 2: is preferably in the range of a rate of 63.3 g / ^{m 2.}

  Further, a means was adopted in which the cellulose fiber in which a part of the hydroxyl groups in the upper layer was carboxylated was deodorized cotton.

  Since the laminated sheet material of the water absorbing layer used in the sweat pad of the present invention according to the above configuration is composed of a non-woven fabric composed of mixed fibers of cellulose fibers and hydrophilic PET fibers in which the hydroxyl group is partially carboxylated, Mainly carboxylated cellulose fibers exhibit water absorption performance, and hydrophilic PET fibers exhibit water permeability or water permeability performance. As a whole, they are excellent in heat retention, breathability, moisture absorption and desorption, and feel good. Furthermore, the initial absorption speed could be made faster than before. Moreover, since the lower layer was comprised with the nonwoven fabric which consists of rayon fiber, it became the thing excellent in the absorptivity and water retention. Therefore, the sweat removing pad formed using this laminated sheet material can provide a sweat pad with high smoothness because the sweat absorbed from the skin by the upper layer is confined in the lower layer and prevented from returning to the upper layer. . In addition, the absorption speed becomes faster than that of the conventional product, and the water absorption amount (water retention amount) is also increased, so that a sweat pad with improved comfort can be provided. Furthermore, the feeling of use which does not feel fuzzing can be obtained.

  Moreover, the initial absorption speed is obtained by setting the blending ratio of the carboxylated cellulose fiber and the hydrophilic PET fiber in the upper layer to a ratio of carboxylated cellulose fiber: hydrophilic PET fiber = 1: 9 to 3: 7. The speed of is surely maintained.

Furthermore, the overall basis weight and ^{55g / m 2 ~95g / m 2} , the ratio of the upper and lower basis weight, the upper layer: lower layer ^{= 11g / m 2: 44g /} m 2 ~31.7g / m 2: By setting the ratio to 63.3 g / m ² , it is possible to significantly prevent wetback and decrease in fiber strength.

  In addition, arbitrary deodorizing cotton can be employ | adopted for the cellulose fiber which carboxylated some hydroxyl groups of the said upper layer.

It is explanatory drawing of the laminated structure of the laminated sheet material of the water absorption layer used for the sweat pad which concerns on this invention. It is explanatory drawing of the layer structure of the test substance used for absorption performance evaluation. It is a graph which shows the change for every progress of time in a water absorption evaluation test. It is a graph which shows the difference in the amount of water absorption and the water absorption speed with and without hydrophilic PET fiber. It is a graph which shows the relationship between the hydrophilic PET fiber ratio and water absorption index in the presence of cotton.

  Hereinafter, preferred embodiments of a laminated sheet material of a water absorption layer used for a sweat pad according to the present invention will be described with reference to the drawings. As shown in FIG. 1A, the laminated sheet material has a two-layer structure of an upper layer 1 on the side in contact with the skin and a lower layer 2 on the clothing side. However, when configured as an actual sweat removing pad, as shown in FIG. 5B, a back layer 3 made of a hydrophobic material is further provided in contact with the lower layer 2 on the clothing side.

  The upper layer 1 employs a material structure that has water absorbency, and has a function of appropriately passing water or permeating the absorbed moisture (sweat) to the opposite side (lower layer 2 side). For example, the upper layer 1 is composed of a nonwoven fabric made of a mixed fiber of cellulose fibers in which a part of hydroxyl groups are carboxylated and hydrophilic PET (polyethylene terephthalate) fibers. In this case, the cellulose fiber in which a part of the hydroxyl group is carboxylated mainly absorbs water, and the hydrophilic PET fiber has a function of allowing water to flow through. That is, since the hydrophilic PET fiber in the upper layer has a function of passing water or passing water, it becomes a trigger for absorption of moisture (sweat). The absorption mechanism is such that it diffuses into the carboxylated cellulose fiber and penetrates and diffuses into the lower layer rayon fiber described later to retain moisture (sweat).

  Cellulose fibers in which a part of the hydroxyl group is carboxylated are a kind of so-called deodorized cotton. Generally, deodorized cotton is superior in heat retention, breathability, moisture absorption / release, etc. to ordinary cotton, and has a soft touch. It is light and suitable for the side that touches the skin. Moreover, it has the effect | action which neutralizes malodors, such as ammonia. On the other hand, hydrophilic PET fiber contains, for example, a polyester polyether block copolymer, and is stable at a temperature of less than 35 ° C., and when heated to 35 ° C. or higher, the dispersion is destroyed and the polyester polyether block copolymer The surface of the polyester polyether block copolymer is hydrophilized by treatment at a temperature of 35 ° C. or higher after providing an aqueous dispersion mixture having the property of precipitating the coalescer, and the polyester polyether block copolymer has an acid component Is an aromatic dicarboxylic acid, an aliphatic dicarboxylic acid or an ester-forming derivative thereof, and a polyether component is copolymerized with 5 to 150% by weight of a polyoxyalkylene glycol having an average molecular weight of 500 or more or a derivative thereof based on a polyester component. PET fiber characterized by being excellent in initial absorption speed There. Hereinafter, in this specification, such PET fibers are referred to as hydrophilic PET fibers.

  There are several ready-made products as this hydrophilic PET fiber, but “Polyester staple fiber 1.6 × 44-70L (product name)” manufactured by Toyobo Co., Ltd. is preferable. That is, it does not possess water absorption performance like rayon, has a characteristic of sustained hydrophilic performance, and retains hydrophilicity even after spunlace processing. Further, when combined with carboxylated cellulose fibers, it has a function of synergistically absorbing water (that is, increasing the absorption speed) and allowing water to penetrate or penetrate into the underlying rayon. Furthermore, it seems that there exists an effect | action which improves the durability of the cellulose fiber carboxylated.

  In addition, as a preferable example of the cellulose fiber in which a part of the hydroxyl group is carboxylated, one having a chemical structure as shown in the following chemical formula 1 can be exemplified. However, the present invention is not limited to this, and deodorized cotton having another structure may be used. For example, “Thunder Long Fine W Type (product name)” manufactured by Nihon Noshi Dyeing Co., Ltd. is used as the deodorizing cotton. Japanese Patent Application Laid-Open No. 6-184941 discloses that methacrylic acid is graft-copolymerized to a fiber in an aqueous solution containing a hydrogen peroxide solution and a divalent iron salt in order to introduce a carboxyl group into the fiber. A manufacturing method is disclosed. Further, it is described that introduction of a carboxyl group in this manner improves hydrophilicity and at the same time has excellent adsorptivity to basic malodorous substances such as ammonia and acts as a deodorizing fiber.

  The blending ratio of the carboxylated cellulose fiber (deodorized cotton) having the above structure and the hydrophilic PET fiber is 10% of the carboxylated cellulose fiber and 90% of the hydrophilic PET fiber. As will be described later, in the evaluation of the water absorption performance, the sample adopting this blending ratio is faster in absorption speed and superior in water retention than normal cotton and the applicant's conventional product. Show.

  In this case, increasing the proportion of the carboxylated cellulose fiber and decreasing the proportion of the hydrophilic PET fiber, the proportion of the carboxylated cellulose fiber is 30% and the hydrophilic PET fiber is 70%. Nearly there is a tendency for the absorption speed to decrease. Therefore, the blending ratio of the carboxylated cellulose fiber and the hydrophilic PET fiber is a ratio of approximately carboxylated cellulose fiber: hydrophilic PET fiber = 1: 9 to 3: 7, particularly from the viewpoint of increasing the water absorption speed. It is preferable to mix with.

  Next, the lower layer 2 employs a non-woven fabric made of 100% rayon fiber as a material structure having water absorption and water retention. Rayon fiber has high water absorption and water retention, and feels good.

The basis weight is 75 g / m ² in total of 10% carboxylated cellulose fiber + 90% hydrophilic PET fiber = 15 g / m ² in the upper layer 1 and 100% rayon fiber = 60 g / m ^{2 in} the lower layer ^2. Is adopted as a basis. As will be described later, in the evaluation of the water absorption performance, the sample adopting this basis weight ratio shows the result that the absorption speed and water retention are superior compared to the normal cotton and the applicant's conventional product. Yes. However, the basis weight of the total be in the range of ^{55g / m 2 ~95g / m 2} , sufficient function is obtained.

In this case, when the basis weight of the lower layer is increased and the basis weight of the lower layer is increased and the basis weight of the lower layer is decreased, wetback occurs near the ratio of upper layer: lower layer = 11 g / m ² : 44 g / m ² , and the fiber itself It can be seen that there is a clear difference in functionality such as weakening. In addition, at the upper limit of the basis weight, there is a difference in functionality in the vicinity of the ratio of upper layer: lower layer = 31.7 g / m ² : 63.3 g / m ² . Therefore, the ratio of upper and lower basis weight, the upper layer: lower layer ^{= 11g / m 2: 44g /} m 2 ~31.7g / m 2: is preferably in the range of a rate of 63.3 g / ^{m 2.}

  Further, the back layer 3 in the case of constituting a sweat removing pad as a finished product is made of a material having hydrophobicity (non-water-permeable or hardly water-permeable), for example, a polyethylene sheet. That is, sweat absorbed by the lower layer 2 is prevented from moving to the clothing side. The back surface layer 3 is preferably selected from materials having air permeability while at the same time having hydrophobicity in order to avoid underarm swelling.

  Subsequently, the evaluation results of the absorption performance of the laminated sheet material having the above configuration will be described in comparison with the normal cotton and the applicant's conventional product. For the evaluation, three specimens were prepared for each, and the performance was compared from the viewpoint of absorption amount, absorption speed, and absorption diffusivity. Further, as shown in FIG. 2, the layer structure of each specimen is the structure described above for the product of the present invention, the upper layer is a deodorized cotton (carboxylized cellulose fiber) + non-woven fabric of hydrophilic PET fiber, and the lower layer is a rayon fiber. Non-woven fabrics, usually cotton, the whole is a non-woven fabric made of cotton fibers, and the applicant's conventional product uses a non-woven fabric of deodorized cotton + hydrophobic PET fibers as the upper layer and a non-woven fabric of rayon fibers + hydrophilic PET fibers as the lower layer did. In addition, the structure of the other company's product mentioned later is the nonwoven fabric of hydrophilic PET + pulp as a whole.

In the sample of the present invention, the upper layer is composed of 10% deodorized cotton (carboxylized cellulose fiber) and 90% hydrophilic PET fiber, and the lower layer is 100% rayon fiber. Furthermore, as a basis weight, deodorized cotton (carboxylated cellulose fiber) 10% in the upper layer + hydrophilic PET fiber 90% = 15 g / m ² , and in the lower layer, rayon fiber 100% = 60 g / m ² , 75 g / m in total ² is adopted. In addition, the conventional sample is composed of 70% deodorized cotton and 30% hydrophobic PET fiber in the upper layer, and 60% rayon fiber and 40% hydrophilic PET fiber in the lower layer. It is. Usually, the sample of cotton is 100% cotton.

[Absorption test]
Test conditions (1) Immersion test Specimen is put into a beaker containing 1 liter of water, left for a maximum of 8 hours, weighs before and after, and calculates water absorption.
(2) Cylinder test A graduated cylinder containing 50 ml of water is turned upside down, placed on each specimen, left for a maximum of 8 hours, and weighed before and after to calculate the amount of water absorption.
Note that the average of the sample numbers 1 to 3 is calculated.

  Regarding this absorption amount evaluation test, the results after 8 hours of the immersion test are shown in Table 1, and the results after 8 hours of the cylinder test are shown in Table 2. Moreover, the graph which shows the change for every progress of time about each test is shown in FIG.

  As can be seen from Tables 1 and 2, in the immersion test, the amount of water absorption was larger in the order of the present invention> conventional> normal cotton. Similarly, in the cylinder test, the amount of water absorption was basically in the order of the present product> conventional product> normal cotton.

[Absorption speed evaluation test]
Test test conditions with water absorption measuring device (1) Test method: Surface water absorption method (Larose method) of JIS L1907
(2) Test equipment: water absorption measuring device KM350-H20U1-10
(3) Specimen dimensions: Invention product length x width about 100mm x 120mm
Conventional product length x width approximately 100mm x 120mm
Cotton length x width approximately 120mm x 120mm
(4) Specimen thickness: Invention product about 0.5mm
Conventional product about 0.5mm
Cotton about 0.9mm
(5) Specimen weight: Invention product about 1.3g
Conventional product about 1.3g
Cotton 1.9g
(6) Specimen composition and ratio thereof as described above Test method Each specimen was set in a water absorption measuring device and water was sucked up (natural absorption). Table 3 shows a comparison of water absorption after 60 seconds and after 90 seconds.

  From Table 3, after 60 seconds and 90 seconds, the product of the present invention has much more water absorption. This also shows that the product of the present invention shows good results.

[Evaluation with or without hydrophilic PET fiber]
For reference, an evaluation test was also conducted on how the water absorption amount and the water absorption speed change with and without hydrophilic PET fibers. FIG. 4 shows the result. The graph of FIG. 4 is a comparison between a 100% cotton sample and a 80% hydrophilic PET fiber + 20% cotton sample. In addition, the test results of the invention products and products of other companies (products with pulp) are also displayed. According to this evaluation test, it was found that a water absorption amount and a water absorption speed were better when about 80% of hydrophilic PET fibers were mixed than with 100% cotton.

[Water absorption, water absorption index]
Table 4 shows the comparison of water absorption and water absorption index at the time of maximum absorption rate for samples of invention, 80% hydrophilic PET fiber + 20% cotton, other products (pulp specification), cotton and rayon. Table 5 shows the relationship between the concentration and the water absorption index. Moreover, the graph which shows the relationship between the hydrophilic PET fiber ratio in the coexistence of cotton and a water absorption index is shown in FIG. In addition, the specimen in which the ratio of the hydrophilic PET fiber is 90% is not 10% cotton but 10% of carboxylated cotton. In the table, the maximum water absorption rate and the amount of water absorption at the maximum water absorption rate are based on the surface absorption method, and the water absorption index is calculated by the following equation.
Y = 2545V + 1411W + 79
Here, Y is the water absorption index, V is the maximum water absorption rate (ml / sec), and W is the water absorption amount (ml) at the maximum water absorption rate. The water absorption index is an index defined by the quality performance measures council for apparel products.

  From the water absorption index, rayon has the highest water absorption, but water is not passed or passed through to the lower layer, and the water is retained, causing the surface to get wet and causing discomfort in use. Absent. In addition, the water absorption index decreases because only the hydrophilic PET fiber has a small capacity to retain the absorbed amount. It is easier to absorb water than a normal towel (cotton: water absorption index 198), and it is mixed with a small amount of carboxylated cellulose fibers (hydrophilic PET fiber 300 or more) to make hydrophilic PET fibers more hydrophilic in order to pass water through or permeate the underlying rayon. Because of its high absorption speed and high absorption, it is comfortable as a sweat pad. Further, since the water absorption index of the other manufacturer's hydrophilic PET + pulp is 158, it is understood that the water absorption index (water absorption speed) is higher when the cellulose fiber is made of cotton or carboxyl group than the pulp. However, the 90/10 point on the graph is an invention and is not 90% hydrophilic PET fiber / 10% cotton, but it is estimated that the water absorption index is slightly reduced. Therefore, when it is considered that the water absorption index of 300 to 400 is preferable as a sweat pad, it is presumed that the ratio of hydrophilic PET fibers is preferably 70% or more. If the water absorption index is less than 300, the water absorption speed and the amount of water absorption are not sufficient, so that it is not comfortable, and if it exceeds 400, the water is not sufficiently passed or penetrated to the lower layer, and the surface becomes wet, which is not preferable in terms of usability.

[Evaluation when deodorizing cotton is replaced with normal cotton with a composition close to that of the invention]
For reference, a change in water absorption when the deodorized cotton was replaced with normal cotton with a composition close to that of the inventive product was tested by cylinder evaluation and immersion evaluation and compared. Table 6 shows the results. From the results of Table 6, it can be seen that the invention product is superior in both the cylinder test and the immersion test. Considering the case where the composition of the comparative product of 20% cotton + 80% hydrophilic PET fiber is changed to the composition of 10% cotton + 90% hydrophilic PET fiber, it is presumed that there is no significant change in water absorption. Therefore, it is presumed that the composition using 10% of deodorized cotton is superior in the amount of absorption than the composition using 10% of normal cotton.

[Diffusion evaluation test]
0.5 ml of colored water was applied to the center of the sample with a pipette and allowed to stand for 5 minutes, and the water spread at that time was observed. As a result, the conventional product of the applicant has a diameter of 40 mm, the product of the present invention has a diameter of 60 mm, and the normal cotton has a diameter of 15 mm. Thereby, it was shown that the product of the present invention has sufficient absorption diffusivity.

  Therefore, from the evaluation results in each test described above, the product of the present invention has a faster water absorption speed and a sufficient water retention amount compared to the conventional product. Conceivable.

  The above water absorption evaluation shows that the laminated sheet material according to the present invention having the above-described configuration has a performance superior to that of a conventional product or the like as a raw material for a sweat pad.

[Fuzzing questionnaire]
In addition, the sensory evaluation of the feeling of use (fluffing) of 15 employees selected at random was compiled in the form of a questionnaire. The evaluation target is the same as the specimen used in the evaluation of the water absorption performance described above. That is, in the sample of the present invention, the upper layer contains 10% deodorized cotton (carboxylized cellulose fiber) and 90% hydrophilic PET fiber, and the lower layer is 100% rayon fiber. In addition, the conventional sample is composed of 70% deodorized cotton and 30% hydrophobic PET fiber in the upper layer, and 60% rayon fiber and 40% hydrophilic PET fiber in the lower layer. It is. Further, the dimensions, thickness, and weight of the specimen are the same as those in the test using the water absorption measuring device described above. In addition, the sample of the other company's product was sample size: length x width about 115 mm x 120 mm, sample thickness: about 0.8 mm, and sample weight: about 1.8 g. Moreover, although the layer structure is unknown, at least a raw material is hydrophilic PET + pulp.

  The evaluation method is as follows: Conventional product (Sample 1), Invention product (Sample 2), Competitor product (Sample 3), no fluff (1 point), almost no fluff (2 points), slightly fluff (3 points), The evaluation was carried out by assigning points in five stages from fluffing (4 points) to very fluffing (5 points). Table 7 shows the results of calculating the evaluation criteria and the average score. The lower the score, the higher the evaluation. This shows that the feeling of use of the invention product is the best and the evaluation is high.

  Next, means for forming a sweat removing pad using the laminated sheet material according to the above configuration as a raw fabric will be described. Basically, it is the same as a conventionally known means for forming a sweat pad, as shown in Patent Document 2, for example. However, the laminated sheet material is composed of the upper layer 1 and the lower layer 2 as described above. Further, a back layer is provided in contact with the lower layer 2. This back layer has hydrophobicity (non-water-permeable or hardly water-permeable), and a polyethylene sheet or the like is adopted as a material structure. In addition, it is preferable to select the back layer from a material having air permeability while having hydrophobicity in order to avoid swelling of the armpit after absorbing sweat.

  And after bonding each layer, it cuts into a shape suitably, and a pad base is formed. Here, as a method of joining the upper layer 1 and the lower layer 2, there is a spunlace method. This spunlace method uses a high-pressure jet water stream to entangle fibers without using an adhesive (binder), and finishes with a good touch while maintaining water absorption and moisture retention, and has high productivity. As another preferable joining method, for example, there is a method in which the entire surfaces of the lower surface of the upper layer 1 and the upper surface of the lower layer 2 are bonded to each other with a hot-melt adhesive. The touch can be made uniform throughout the pad. However, the bonding method of each layer is not limited to the above method, and various conventionally known bonding methods such as thermocompression bonding of the periphery of each layer can be appropriately employed.

  Next, in the pad base, a mounting portion where a pressure-sensitive adhesive tape is bonded with a hot melt adhesive or the like is provided on the lower surface of the back surface layer to constitute a sweat removing pad as a product. Then, while the adhesive tape is covered with a release paper to be in a shipping state, the sweat removing pad can be attached to the buttock of clothing through the adhesive tape by peeling the release paper. The pad is usually attached to the garment by folding the pad in half and sandwiching the heel of the garment at the fold. There are also things. Of course, the shape of the pad is selected when the pad is cut. Depending on the shape of the cut, the pad can be configured in any way.

  Since the laminated sheet material for a sweat removing pad according to the present invention is composed of an upper layer having high water absorption and a lower layer having high water retention as described above, the sweat removing pad formed using this laminated sheet material has a higher skin. Sweat sucked from is trapped in the lower layer and prevented from returning to the upper layer. Therefore, it is possible to provide a sweat pad with high smoothness. Moreover, the feeling of use regarding fuzzing etc. is also favorable. In this case, by using the above-described material, the absorption speed is faster than that of the conventional product, and the water absorption amount (water retention amount) is also increased, thereby providing a sweat pad with improved comfort.

1 Upper layer 2 Lower layer 3 Back layer

Claims (3)

  It has a two-layer structure of an upper layer on the side in contact with the skin and a lower layer on the clothing side, and the upper layer is composed of a non-woven fabric composed of a mixed fiber of cellulose fibers having a hydroxyl group partially carboxylated and hydrophilic PET fibers. Is composed of a nonwoven fabric made of rayon fiber, and the blending ratio of the carboxylated cellulose fiber and the hydrophilic PET fiber is such that the carboxylated cellulose fiber: hydrophilic PET fiber = 1: 9 to 3: 7. A laminated sheet material of a water-absorbing layer used for a sweat pad, which is characterized by a ratio. The total basis weight of a ^{55g / m 2 ~95g / m 2} , the ratio of the upper and lower basis weight, the upper layer: lower layer ^{= 11g / m 2: 44g /} m 2 ~31.7g / m 2: 63. The laminated sheet material for a water-absorbing layer used for a sweat pad according to claim 1, which has a ratio of 3 g / m ² .   The laminated sheet material for a water-absorbing layer used for a sweat pad according to claim 1 or 2, wherein the cellulose fiber in which a part of the hydroxyl groups in the upper layer is carboxylated is deodorized cotton.

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