JP3218287U - Non-woven - Google Patents

Abstract

The present invention provides a non-woven fabric that can be thinned by improving strength while maintaining the original water absorption performance of the non-woven fabric. A non-woven fabric 10 in which a core material 30 made of a large number of cotton yarns 31 is introduced into a non-woven main body 20 that is formed in a sheet shape in which a large number of cotton fibers are intertwined, and the non-woven main body 20 has a cotton fiber. And the cotton yarn 31 of the core member 30 have an entangled structure. The nonwoven fabric 20 has a thickness of 0.28 to 1.00 mm and a basis weight of 39 to 260 g / m <2>, and the core material 30 is plain-woven by alternately intersecting a large number of cotton yarns 31 as warp yarns 32 and weft yarns 33. . [Selection] Figure 2

Description

  The present invention relates to a nonwoven fabric, and more particularly to a sheet-like nonwoven fabric.

  The nonwoven fabric has excellent water absorption because it is formed by irregularly tangling various fibers such as natural fibers and chemical fibers. In particular, since it is inexpensive, can be easily manufactured, and has high productivity, it is highly versatile as a water-absorbing material, and its uses are diverse, such as hygiene products, medical supplies, clothing items, daily necessities, building materials, and interior items.

  In these nonwoven fabric products, for example, sheet-like products such as gauze, hand towels, and cooking paper are required to have excellent water absorption performance while being formed relatively thin. Therefore, in these nonwoven fabrics, a parallel web that can be manufactured with a stable basis weight and uniform quality such as thickness and water absorption performance is used. However, since the parallel web is formed by laminating fibers in a certain direction, the strength in the longitudinal direction is strong, but the strength in the transverse direction is weak. In particular, when the thickness is reduced, the lateral strength reduction becomes more prominent.

  On the other hand, a cross web formed by laminating fibers in the cross direction can provide excellent strength in both the vertical and horizontal directions, but the basis weight is likely to vary, making it difficult to manufacture with uniform quality. . Therefore, as another method for increasing the strength of the sheet-like nonwoven fabric, it is known to form a plurality of fibers by laminating (for example, see Patent Document 1).

  The laminated body of the non-woven fabric is formed by laminating the surface fiber layer and the internal fiber layer containing the heat-fusible fiber, and is heated to a temperature equal to or higher than the melting point of the heat-fusible fiber. Are partially fused and integrated. However, since this nonwoven fabric improves the strength by laminating a plurality of fiber layers, there is a limit to thinning in order to maintain the required strength. In addition, the integration by heat fusion is not preferable when it is thin because it adversely affects the texture of the nonwoven fabric.

JP 2013-174036 A

  This invention is made | formed in view of the said point, Comprising: It provides the nonwoven fabric which can aim at thinning by improving intensity | strength, maintaining the original water absorption performance of a nonwoven fabric.

  Specifically, the invention of claim 1 is a non-woven fabric in which a core material made of a large number of cotton yarns is introduced into a non-woven main body formed into a sheet shape by entwining a large number of cotton fibers, and the non-woven main body cotton The present invention relates to a nonwoven fabric characterized in that the fibers and the cotton yarn of the core material have an entangled structure.

The invention of claim 2 relates to the nonwoven fabric according to claim 1, wherein the nonwoven fabric has a thickness of 0.28 to 1.00 mm and a basis weight of 39 to 260 g / m ² .

  Invention of Claim 3 concerns on the nonwoven fabric of Claim 1 or 2 whose said nonwoven fabric main body is a parallel web.

  The invention according to claim 4 relates to the nonwoven fabric according to any one of claims 1 to 3, wherein the core material is plain-woven by alternately intersecting the plurality of cotton yarns as warps and wefts.

  The nonwoven fabric according to claim 1 is a nonwoven fabric in which a core material made of a large number of cotton yarns is introduced into a nonwoven fabric body that is formed into a sheet shape in which a large number of cotton fibers are entangled with each other, Since the cotton fiber of the core and the cotton yarn of the core material have an entangled structure, the overall strength is increased while maintaining the original water absorption performance of the nonwoven fabric, and the nonwoven body and the core material can be firmly bonded and easily thinned Can be achieved.

According to the nonwoven fabric according to the invention of claim 2, in the invention of claim 1, the nonwoven fabric has a thickness of 0.28 to 1.00 mm and a basis weight of 39 to 260 g / m ^2. Thinning can be achieved at the same time.

  According to the nonwoven fabric according to the invention of claim 3, in the invention of claim 1 or 2, since the non-woven main body is a parallel web, it is easy to equalize quality such as thickness and water absorption performance.

  According to the non-woven fabric according to the invention of claim 4, in the invention of claims 1 to 3, the core material is introduced into the nonwoven main body because the large number of cotton yarns are alternately cross-woven as warps and wefts. It becomes easy to do and the reinforcement effect to a nonwoven fabric body increases.

It is sectional drawing which represented typically the nonwoven fabric which concerns on one Embodiment of this invention. FIG. 2 is an enlarged plan view schematically showing the nonwoven fabric of FIG. 1. It is a schematic diagram showing the manufacturing process of the nonwoven fabric of FIG.

  A nonwoven fabric 10 according to an embodiment of the present invention shown in FIGS. 1 and 2 is a sheet-like nonwoven fabric in which a core material 30 is introduced into a nonwoven body 20. This nonwoven fabric is suitably used as a thin sheet-like material such as gauze, hand towel, cooking paper and the like.

As shown in FIGS. 1 and 2, the non-woven main body 20 is a member that defines the water absorption performance, thickness, and the like of the nonwoven fabric 10, and is formed into a sheet shape in which a large number of cotton fibers 21 are intertwined. In the nonwoven main body 20, a parallel web is preferably used. Since the parallel web is formed by laminating cotton fibers in a certain direction, the surface is formed relatively flat, the basis weight is stable, and the quality such as thickness and water absorption performance is easily made uniform. The basis weight of the nonwoven body 20 is set to 25 to 200 g / m ² from the viewpoint of the quality required for the nonwoven fabric 10.

  The nonwoven body 20 is manufactured by a known nonwoven fabric manufacturing method having a blended cotton process, a carding process, and an entanglement process. That is, raw cotton made of cotton is loosened using a known mixed cotton device, and a mixture such as seed coat, foliage, and dust is removed (mixed cotton process), and the obtained cotton material is used as a known cotton device. The fiber is subdivided into fibers, and fine inclusions and short fibers are removed to form a strip (carding process), and then the striped cotton fibers are laminated in a certain direction to form a needle punch method or span lace. The nonwoven body 20 is obtained by forming into a sheet shape by a known fiber bonding method such as a method (entanglement step).

  As shown in FIGS. 1 and 2, the core member 30 is a member that is introduced into the nonwoven body 20 and reinforces it, and includes a large number of cotton yarns 31. In the core material 30, a large number of cotton yarns 31 are arranged in a lattice shape or the like so as not to be extremely biased with respect to the entire surface of the sheet-like nonwoven body 20. As shown in FIG. 2, the core material 30 of the embodiment is formed by plain weaving with a large number of cotton yarns 31 alternately intersecting as warp yarns 32 and weft yarns 33. Since the plain-woven core material 30 is formed in a cloth shape, shape retention of a plurality of cotton yarns can be obtained. Therefore, the core material 30 can be easily introduced into the non-woven main body 20 and the reinforcing effect on the non-woven main body 20 is enhanced.

  In the core material 30 woven in plain, the reinforcing effect can be enhanced by increasing the number (density) of the cotton yarns 31, but if it is too much, the texture may be impaired. Therefore, the number (density) of cotton yarns is determined according to the required strength and texture, the form of the product to be manufactured, and the like. For example, by setting the number of warps per square inch to 19 to 30 and the number of wefts to 9 to 30, appropriate strength and texture of the nonwoven fabric 10 can be obtained.

  In the nonwoven fabric 10, as shown in FIG. 1, the cotton fiber of the nonwoven main body 20 and the cotton yarn of the core material 30 have an entangled structure. The entangled structure is a state in which the non-woven main body 20 and the core material 30 are combined and integrated by irregularly intertwining the cotton fibers 21 of the non-woven main body 20 and the cotton yarn 31 of the core material 30. Moreover, since this entanglement structure is couple | bonded only by the entanglement of the cotton fiber 21 and the cotton thread 31, the nonwoven fabric main body 20 and the core material 30 can be integrated easily in a thin state. In particular, in this entangled structure, since the cotton fibers 21 constituting the nonwoven main body 20 and the cotton yarn 31 constituting the core material 30 are the same cotton material, they are easily entangled and the bond is strengthened. In addition, when the cotton fiber of the non-woven main body 20 and the cotton yarn of the core material 30 are entangled, an appropriate pattern such as a lattice shape, an uneven surface shape, and a wave shape can be formed. The nonwoven fabric 10 of the embodiment shown in FIG. 2 has a lattice pattern imitating gauze.

  This entangled structure is formed by superimposing the non-woven main body 20 and the core material 30 and entwining cotton fibers and cotton yarns using a spunlace method in which a high-pressure water stream is injected. In the spunlace method, it is possible to easily and strongly bond only by entanglement of cotton fiber and cotton yarn without using heat fusion or adhesive. Therefore, thinning is easy and there is no possibility of damaging the texture as a sheet-like material.

In the nonwoven fabric 10, the thickness and basis weight are determined according to the form of the product to be manufactured. In particular, in order to achieve both required water absorption performance and thinning, it is preferable that the thickness is 0.28 to 1.00 mm and the basis weight is 39 to 260 g / m ² . In the nonwoven fabric 10 of the present invention, since the core material 30 is introduced into the nonwoven body 20, the thickness slightly increases compared to the nonwoven body 20 alone. This increase in thickness corresponds to the type of core material 30 to be introduced. Therefore, in consideration of the desired thickness of the nonwoven fabric 10, the thickness of the nonwoven body 20, the type of the core material 30, and the like may be appropriately selected.

  Here, the manufacturing process of the nonwoven fabric 10 of this invention is demonstrated. First, the non-woven main body 20 and the core material 30 are formed separately, and the core material 30 is overlaid on the non-woven main body 20 to form a workpiece 40 as shown in FIG. The non-woven body 20 is preferably a parallel web, and the core 30 is preferably a plain-woven cloth. Since the nonwoven main body 20 is a parallel web, the surface is relatively flat, and the core material 30 can be stacked stably.

  The workpiece 40 is placed on the mold 50 with the nonwoven main body 20 as the lower side. The mold 50 is a member for forming a predetermined pattern on the workpiece 40. The shape of the mold 50 is formed corresponding to an appropriate pattern that can be applied to the sheet-like material, such as a lattice shape, an uneven surface shape, and a wave shape.

  Subsequently, a high-pressure water flow is jetted onto the workpiece 40 by the jetting means 60, and the cotton fibers of the nonwoven body 20 and the cotton yarn of the core material 30 are entangled. At this time, since the workpiece 40 is placed on the mold 50, the cotton fibers of the nonwoven body 20 are entangled with the cotton thread of the core material 30 and are integrally joined together, and the shape of the mold 50 is combined with the cotton thread. The nonwoven fabric 10 is obtained by shaping according to the (pattern). At this time, as shown in FIG. 2, some of the cotton threads 31 a of the core material 30 are not partially entangled with the nonwoven body 20, and the shape of the nonwoven body 20 and the core material 30 The shape may not match perfectly. This is presumably because the cotton fibers and the cotton yarn are entangled while moving irregularly by the injection of the high-pressure water flow. However, since the part which is not entangled is a very small part, quality such as strength and water absorption performance is not impaired. The nonwoven fabric 10 thus obtained is subjected to refining, bleaching, drying, etc. as necessary, and shipped as a product.

  Next, a nonwoven fabric (Example 1) of the present invention prepared under the following conditions and a conventional nonwoven fabric (Comparative Example 1) were prepared and tested for tensile strength. The test of tensile strength is based on JIS L 1912 (1997), and Example 1 and Comparative Example 1 are used in each of the vertical and horizontal directions using a tensile tester (manufactured by Shimadzu Corporation: AGS-X). And the load (N) when cut in each direction was measured. The results are shown in Table 1.

[Example 1]
First, a sheet-like nonwoven main body, which is a parallel web, was formed from cotton according to a known nonwoven fabric manufacturing method. The nonwoven body had a thickness of about 0.22 mm and a basis weight of about 33 g / m ² . Further, a core material was formed by plain weaving of cotton yarn with 19 warps and 15 wefts per square inch. Next, the formed non-woven main body and the core material are overlapped and placed in a mold having a lattice-shaped molding surface, and the non-woven main body and the core material are entangled by the spunlace method to form a lattice shape imitating gauze The sheet-like nonwoven fabric was formed. This sheet-like nonwoven fabric had a thickness of about 0.349 mm and a basis weight of about 50 g / m ² . The nonwoven fabric of Example 1 was obtained by stacking (8P) eight sheet-like nonwoven fabrics formed by the same procedure.

[Comparative Example 1]
A sheet-like nonwoven fabric which is a parallel web was formed from cotton in accordance with a known nonwoven fabric production method. This nonwoven fabric had a thickness of about 0.2 mm and a basis weight of about 30 g / m ² . This nonwoven fabric was placed in a mold having a grid-shaped molding surface similar to that of Example 1, and a lattice-shaped cotton nonwoven fabric imitating gauze was formed by a spunlace method. A nonwoven fabric of Comparative Example 1 was obtained by stacking (8P) 8 cotton nonwoven fabrics formed in the same procedure.

  As shown in Table 1, the transverse tensile strength in Comparative Example 1 was remarkably low, whereas in Example 1, the transverse tensile strength was significantly improved. In Example 1, not only the strength in the horizontal direction but also the strength in the vertical direction was higher than that of Comparative Example 1. Thus, in the nonwoven fabric of Example 1, not only was it possible to improve the weakness of the transverse strength peculiar to the conventional nonwoven fabric (parallel web) by introducing the core material into the nonwoven main body. It has been found that the overall strength is higher than that of the conventional nonwoven fabric.

Subsequently, in addition to the nonwoven fabric of Example 1 and the conventional nonwoven fabric of Comparative Example 1, sheet-like materials of Comparative Examples 2 and 3 prepared under the following conditions were prepared, and a water absorption (g) comparison test was performed. It was. In the comparative test of water absorption, the dry weight (initial weight) of Example 1 and Comparative Examples 1 to 3 was measured, and Example 1 and Comparative Examples 1 to 3 were ion-exchanged water at a room temperature of 21 ° C. at room temperature. After dipping and picking up when it began to settle, it was held on the surface of the water for 10 seconds, and then its weight (weight after water absorption) was measured, and the increased weight was determined as the amount of water absorption for comparison. In this comparative test, Example 1 and Comparative Examples 1 to 3 are respectively 5 × 5 (cm ² ), 5 × 7.5 (cm ² ), 7.5 × 7.5 (cm ² ), 7.5 Each size of x10 (cm < ² >) was prepared. The results of the comparative test are shown in Table 2. The water absorption (g) was calculated by the following formula.
Water absorption (g) = weight after water absorption (g) −initial weight (g)

[Comparative Example 2]
Cotton yarn was plain woven with 30 warps and 30 wefts per square inch to form a gauze. The gauze of Comparative Example 2 was obtained by stacking 8 pieces of gauze formed in the same procedure (8P).

[Comparative Example 3]
Cotton yarn was plain woven with 28 warps and 24 wefts per square inch to form a gauze. The gauze of Comparative Example 3 was obtained by stacking 8 pieces of gauze formed by the same procedure (8P).

  As shown in Table 2, the nonwoven fabric in which the core material was introduced into the nonwoven main body of Example 1 and the cotton nonwoven fabric of Comparative Example 1 were significantly more water-absorbing than the gauze made of cotton yarns of Comparative Examples 2 and 3. It was excellent. Therefore, in the nonwoven fabric of Example 1, it was found that the original water absorption performance of the nonwoven fabric was maintained even when the core material was introduced into the nonwoven main body.

  As illustrated and described above, the nonwoven fabric of the present invention has a woven structure in which the core material is introduced into the nonwoven body and the cotton fiber of the nonwoven body and the cotton thread of the core material have an entangled structure. Since the core cotton thread is intertwined and joined together, the strength of the entire nonwoven fabric can be enhanced while maintaining the original water absorption performance of the nonwoven fabric. In particular, since it is an entangled structure of cotton fibers and cotton yarns, the nonwoven body and the core material can be firmly bonded, and the nonwoven fabric can be easily thinned.

  The non-woven fabric of the present invention can have a strength superior to that of a conventional non-woven fabric while maintaining water absorption performance, and can be thinned. Therefore, it is promising as an alternative to the conventional sheet-like nonwoven fabric.

DESCRIPTION OF SYMBOLS 10 Nonwoven fabric 20 Nonwoven body 21 Cotton fiber 30 Core material 31, 31a Cotton yarn 32 Warp yarn 33 Weft yarn 40 Workpiece 50 Mold 60 Injection means

Claims (4)

  A non-woven fabric in which a core material made of a large number of cotton yarns is introduced into a non-woven main body formed into a sheet shape in which a large number of cotton fibers are intertwined, wherein the non-woven main body cotton fibers and the core material cotton yarns A nonwoven fabric having an entangled structure. The nonwoven fabric had a thickness of 0.28～1.00Mm, nonwoven fabric according to claim 1 basis weight is 39~260g / m ^2.   The nonwoven fabric according to claim 1 or 2, wherein the nonwoven main body is a parallel web.   The nonwoven fabric according to any one of claims 1 to 3, wherein the core material is plain woven by alternately intersecting the multiple cotton yarns as warps and wefts.

Images