JP2003103677A - Composite sheet of nonwoven fabric and fiber web, absorbent product, and method for producing composite sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonwoven fabric / fiber web composite sheet, an absorbent product and a method for producing a composite sheet. SOLUTION: In a composite sheet in which a nonwoven fabric layer and a fiber web layer are bonded to each other, the composite sheet has a plurality of first network regions having a high density and a small thickness;
The first nonwoven fabric layer is composed of a second network region having a relatively low density with respect to the first network region, and the surface of the nonwoven fabric layer is a smooth surface, and the surface of the fibrous web layer is a bulky surface. The basis weight of the nonwoven fabric layer is 10 to 50 g /
m ² , and the Gurley method air permeability of the entire composite sheet is 3
It is within sec. The fibrous web layer is 1.5 to 12;
d having a fineness of at least d and a fiber length of 100 mm or less
The main component is a fiber selected from E-based, PP-based, PET-based, nylon-based, and acrylic-based synthetic fiber staples, and a mixture thereof.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a composite sheet of a nonwoven fabric and a fibrous web, an absorbent product having the composite sheet, and a method for producing the composite sheet.

[0002]

2. Description of the Related Art "Texel" (trade name) manufactured by Oji Paper Co., Ltd. has been known as a composite of a non-woven fabric layer and a fibrous web layer. This composite is obtained by uniformly entangling fine fibers of pulp on the entire surface of a PP spunbonded non-woven fabric layer by a high-pressure water flow, and is highly useful as a composite material having a hydrophobic core and a hydrophilic surface and good dimensional stability. Has been evaluated. As another example, flooring materials and carpets in which a fiber needle punched web is reinforced by spunbond backing are known. These basis weights are extremely large.

[0003]

Nonwoven / fibrous web composites, such as the conventional "texels" as described above, are suitable for the applications corresponding to their constituents, but directly on the human skin. When it is used as a top sheet in various absorbent products, for example, when it is used as a top sheet in various absorbent products, the surface in which fine fibers are uniformly entangled with a high-pressure water flow has a high density and a smooth surface. When it is held in contact with the skin for a long time, it causes discomfort due to excessive adhesion, and in extreme cases, there is a risk of causing a disorder due to stuffiness or the like.

[0004]

The composite sheet of the non-woven fabric layer and the fibrous web layer of the present invention has the function and structure of the non-woven fabric, which is one of the constituents, and the fibrous web, which is the other constituent. The function and organization are preserved as they are,
In addition, by joining and integrating both in a network shape so as to have a partial difference in wall thickness and a difference in density, a new function as a complex different from individual constituent components was given is there.

That is, the composite sheet of the present invention is a composite sheet composed of a laminate of a nonwoven fabric layer and a fibrous web layer, wherein the composite sheet has a high density and a thin first network region, The second network region has a low density and a large thickness with respect to the first network region, the surface of the non-woven fabric layer side is a smooth surface, and the surface of the fibrous web layer side is a bulky and uneven surface. Is characterized in that.

The preferred embodiments of the present invention are as follows.

The first network area and the second network area
Each of the network areas has a strip shape and is alternately arranged.

The first network region has a strip shape and is arranged so as to extend so as to intersect with each other, and the second network region is arranged as a dividing layer surrounded by the first network region.

The first network area is composed of a large number of small areas, which are arranged in a distributed state in the second network area.

The first network area has a thickness of 1 mm.
Is less than 0.1 g / cm ³ , and the second network region has a thickness of 1 mm or more and a density of 0.1 g / cm 3.
It is less than ³ .

The total weight of the composite sheet is 20 to 120 g.
/ M ² .

The basis weight of the non-woven fabric layer is 10 to 50 g / m ^2.
And the Gurley air permeability of the entire composite sheet is 3 se
It is within c.

The non-woven fabric layer is PE, PP, PET, P
E / PP, PE / PET, and PET derivative / PET
It is composed of a filament nonwoven fabric selected from the group consisting of resins.

The fiber web layer has a fineness of 1.5 to 12 d or more and a fiber length of 100 mm or less.
The main component is a fiber selected from the group consisting of PP-based, PET-based, nylon-based, acrylic-based synthetic fiber staples, and a mixture thereof.

The fibrous web layer includes a sheath-core type composite fiber staple having a heat fusion property.

[0016] The fibrous web layer contains side-by-side type composite fibers which are crimped by heat shrinkage.

At least one of the non-woven fabric layer and the fibrous web layer is subjected to a surface hydrophilic treatment for improving water wettability.

The fibrous web layer carries SAP particles.

The absorbent product of the present invention is characterized by including the composite sheet as an absorbent.

The absorbent product of the present invention has the composite sheet as a top sheet, and is arranged so that the non-woven fabric layer surface is in contact with the wearer's body and the fibrous web layer surface is in contact with the absorbent body. Is characterized by.

In the absorbent product of the present invention, the composite sheet is provided as a liquid distribution unit arranged in proximity to the surface of the absorbent so as to cover 5 to 50% of the surface of the absorbent. It is characterized by being

In the absorbent product of the present invention, the composite sheet is arranged so that the fiber web layer surface of the composite sheet is in contact with the wearer's body and the non-woven fabric layer surface is in contact with the absorbent body. The web layer functions as an acquisition layer, and the non-woven web layer functions as a diffusion functional layer.

According to the method for producing a composite sheet of the present invention, a non-woven fabric layer and a fibrous web layer are superposed on each other to form a laminated web, and then a desired shape of the laminated web is made thinner than a peripheral region. It is characterized in that a shaping process is performed to form a thin and high density first network region and a thicker and lower density second network region.

Further, in the method for producing a composite sheet of the present invention, a plurality of first network regions having a high density and a small thickness and a plurality of second network regions having a relatively low density with respect to the first network regions are provided. A method for producing a composite sheet in which a non-woven fabric layer and a fibrous web layer are bonded to each other so that (1) 10 to 50 g / m ² of spunbonded non-woven fabric is used as the non-woven fabric layer. A step of preparing a laminated web by laminating a fiber web layer having a basis weight of 10 to 50 g / m ² composed of a compound fiber staple having a fineness of ˜12 d; and (2) adding 5 to 30 mm to the laminated web. Beam spacing is 2.06 MPa
(20 kgf / cm ² ) A step of preparing a composite sheet in which the nonwoven fabric layer and the fibrous web layer are linearly joined by operating and entangled with a water beam,
(3) A step of applying an SAP slurry dispersed in an ethanol / water-based mixed solvent to the composite sheet, and then removing the solvent to form an absorption layer.

Further, in the method for producing a composite sheet of the present invention, a plurality of first network regions having a high density and a small thickness and a plurality of second network regions having a relatively low density with respect to the first network regions are provided. A method for producing a composite sheet in which a non-woven fabric layer and a fibrous web layer are bonded to each other so as to form (1) on a spunbonded non-woven fabric of 10 to 50 g / m ² as the non-woven fabric layer. 10 composed of synthetic fiber having a fineness of 2 to 12d
A step of laminating a fibrous web layer having a basis weight of ˜50 g / m ² to prepare a laminated web; and (2) applying SAP particles in a band shape at predetermined intervals to the above-mentioned SA.
A step of preparing a SAP-supporting laminated web in which P particles are present and SAP particles are not present;
(3) a step of joining the fibrous web layer and the non-woven fabric layer to form the densified layer by selectively press-bonding the non-existing portions of the SAP particles of the SAP-supporting laminated web. It is characterized by having.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, the composite sheet of the present invention is composed of three parts, that is, the nonwoven fabric layer, the fibrous web layer and the joint portion thereof. The following describes the role of the non-woven fabric layer, the role of the fibrous web layer, and the role of the joint portion of the two layers separately in three parts, and further an embodiment example showing the characteristics as a composite.

First, Table 1 shows the basic functions and basic physical properties of the non-woven fabric layer, the fibrous web layer and the bonding portion.

[0028]

[Table 1] (1) Constitution of Nonwoven Fabric Layer In the present invention, a preferred nonwoven fabric layer is not a thick and bulky one such as an air-through nonwoven fabric or an air-laid nonwoven fabric, but the nonwoven fabric has a low basis weight and a high density, rather close to paper. Means a non-woven fabric of the nature. For example, spunbond (SB), which is a filament nonwoven fabric of PE, PP, and PET, and spunbond melt-blown composite (SMS).

The physical properties required for such a non-woven fabric layer are as follows:
When the composite sheet is applied as a top sheet of an absorbent product, since the non-woven fabric layer is the surface that comes into contact with other components, particularly the absorbent component, in addition to the physical properties shown in Table 1,
It is desirable to have an apparently smooth surface without large irregularities. Therefore, the outer surface of the nonwoven fabric layer is referred to as a smooth first surface.

Second, the non-woven fabric layer needs to function as a strength support. This is because the fibrous web layer used in the present invention is preferably in an unbonded state as much as possible, as described later, and the strength as a composite sheet depends almost entirely on the nonwoven fabric layer.

Thirdly, it is desired that this non-woven fabric layer has a function of a filter. For example, when this composite sheet is used as a base material for supporting SAP, SAP has a certain particle size distribution (generally, a diameter of 50 to 1,000 μm), and the fibrous web layer easily passes a portion of about 500 μm or less. I will let you. The non-woven fabric layer functions as a filter for trapping the fine SAP that has permeated the fibrous web layer. Specific examples of the non-woven fabric include thermal-bonded non-woven fabric which is partially compressed into a film, spunbonds, and SMS and SMMS which are composites of spunbond and meltblown. As raw material fiber,
PE, PP, PET, nylon, acrylic, and PE
/ PP, PP / PET, PE / PP, PET derivative / P
Composite fibers such as ET are preferably used.

(2) Construction of the fibrous web layer A bulky and uneven fibrous web layer is a sheet-like fibrous mat, for example, a card obtained by defibrating staple fibers having a fiber length of 100 mm or less. It is desirable to use a web, or an unbonded web that is as bulky and non-woven as possible, such as a web, or an air-laid web obtained by forming shorter fibers with an air stream. The function required of this fibrous web layer is, first of all, the temporary holding capacity of liquid (so-called acquisition function). The second is a diffusion function of quickly distributing and splitting the retained liquid, and the third is a function of accommodating and supporting SAP particles required when used as an absorber.

These functions are largely related to the bulkiness of the fibrous web layer and the high porosity and "fatigue" resistance, ie resilience. Bulkiness is at least 0.1 g / c when expressed in terms of apparent density.
It is preferably less than m ³ , more preferably 0.06 g / cm
It is ³ or less. In that sense, a hydrophobic synthetic fiber having a larger fineness is preferable than a cellulosic fiber which is easily “fatigue” in a wet state.

The constituent components of the fibrous web layer having high resilience include PE type, PP type, PET type, nylon type,
A single synthetic fiber such as an acrylic fiber or a mixture thereof is used. The fineness is preferably 1.5d to 12d, more preferably 4 to 12d, thick denier crimped fibers generally used as cotton fluff, and hollow crimped fibers having a side-by-side structure. ,
It is desirable because it is stiff and hard to cause "fatigue."

As the structure of the fibrous web layer, an unbonded one, such as a card web, is preferable, and it may be a non-woven fabric. Among the non-woven fabrics heat-bonded by the so-called through-air non-woven fabric process, Particularly bulky non-woven fabrics match the purpose of the present invention.

Even if the fibrous web layer is composed of hydrophobic fibers, it is desirable to ensure liquid permeability. By performing surface hydrophilic treatment by adding a surface-active agent in the form of spray or foam, the wetting property of the surface can be improved even if the fiber itself does not absorb water. When making a web by the card method, spinning oil agents such as antistatic agents used to maintain card suitability,
The surface hydrophilizing agent may be substituted. When a web is formed by adding hydrophilic fibers such as rayon, lyocell, cotton, and PVA to hydrophobic fibers to form a mixed fiber system, good water permeability can be obtained. It is preferable that the composition of synthetic fiber is 100%, because the water will be lost and the water will be lost in the voids, and the liquid dispersibility will be impaired.

(3) Basic Structure of Composite Sheet FIG. 1 is a sectional view showing the basic structure of a composite sheet in which a nonwoven fabric layer and a fibrous web layer are laminated and joined.

As seen in FIG. 1, the composite sheet 10
Comprises a non-woven fabric layer 1 forming a smooth surface (first surface) 1a, and a fibrous web layer 2 having a bulky uneven surface (second surface) 2a. Of the first network region (A) and a bulky second network region (B) that is not crimped. When the fibrous web layer 2 is in an unbonded state, the fibrous web layer 2 and the non-woven fabric layer 1 are integrally bonded only in the pressure-bonded first network region (A). It will be.

The specifications of the composite sheet having such a cross-sectional structure will be described.
The total basis weight is preferably 20 to 120 g / m ² , and more preferably 30 to 80 g / m ² . If the thickness is less than 20 g / m ^2, it is difficult to obtain an uneven structure, and if it exceeds 120 g / m ² , cost may increase and handling may be difficult.

Expressing the difference between the first network area (A) and the second network area (B) in terms of thickness and apparent density, the first network area (A) has a thickness of 1 mm or less, more preferably 0.3 to. The range is 0.8 mm.
If it exceeds 1 mm, the rigidity is increased and it is difficult to maintain the flexibility of the sheet. Apparent density preferably 0.1 g / cm ³ or more, more preferably 0.15~0.5g / cm ^3. If it is less than 0.1 g / cm ³ , physical properties may lack dimensional stability.

The thickness of the second network region (B) is preferably 1 mm or more, more preferably 2 to 10 mm. If the thickness is less than 1 mm, sufficient bulk may not be ensured. Apparent density is preferably 0.1 g / c
m ³ or less, more preferably 0.02 to 0.06 g / cm
In the range of ^3, if still sufficient gap exceeds 0.1 g / cm ³ can not be secured is caused.

The first network area (A) and the second network area (B) can be distributed in various patterns according to the application and desired characteristics. An example is a pattern as shown in FIGS. 2 and 3.

FIG. 2 shows an example in which the first network area (A) and the second network area (B) both exist as a continuous phase. FIGS. 2 (1) and 2 (2) show the first network area (A). ) Exists in the second network area (B) in a straight band shape, and FIG. 2 (3) shows an example in which the first network area (A) exists in a curved shape in the second network area (B). Indicates.

FIG. 3 shows the first network area (A).
3 (1) and 3 (2) in an example in which the second network region (B) is distributed as a continuous phase or a split phase.
Is an example in which the second network region (B) is distributed as a discontinuous phase by the first network region (A) of the continuous phase formed in a lattice shape, and FIGS. 3 (3), (4) and (5).
Shows an example in which the first network area (A) is distributed as a disconnected phase in the continuous second network area (B).

(4) Method for manufacturing composite sheet A composite sheet 10 having a basic structure as shown in FIGS. 1 to 3 is prepared by first forming a laminated web of a nonwoven fabric layer 1 and a fibrous web layer 2, and then forming both layers. Through the steps of forming the thin and high-density first network region (A) and the thick and low-density second network region (B) by joining the layers and performing a thick and thin surface shaping process. can get.

In the method for producing the composite sheet of the present invention, various embodiments can be adopted depending on two factors, that is, the mode of joining the non-woven fabric layer and the fibrous web layer and the method of imprinting the uneven surface shape.

First, as a joining mode, for example, entanglement joining with high-pressure water, high-pressure steam or the like, joining by heat fusion, and joining with hot-melt resin. Each representative example will be described below, and a manufacturing process of a laminated entangled sheet that is surface-shaped at the same time as entanglement and joining with high-pressure water will be described in detail in a manufacturing process of an absorbent product described below.

Another method for producing a composite sheet is to form a laminated web in which a heat-meltable component coexists in either or both of the constituent non-woven fabric layer and fibrous web layer, and has a grid-like surface irregularity. Is performed by performing a partial pressure-bonding process with a heating roll having a pressure, and thus the first network regions (A) pressure-bonded in a grid shape are continuously formed. By such a method, FIG.
A composite sheet having the first network area (A) and the second network area (B) distribution as shown in (5) is obtained.

Still another method for producing a composite sheet is to apply a hot melt adhesive to the surface of one or both of the non-woven fabric layer and the fibrous web layer by means such as coating or spraying, and then apply the coated surface. After making a laminated web in which both layers are joined with each other, the laminated web is pressed and pressure-bonded with a hot embossing roll having an uneven surface, whereby the first network is formed according to the shape of the convex portion of the embossing roll. A region is formed. The hot melt used in this step may be a tacky tacky hot melt or a non-tacky one such as EVA resin.

The functions to be possessed by the composite sheet, the specifications of the constituent components, the distribution states of the first network region and the second network region, and the manufacturing method thereof have been described above. An example of application to an absorbent product that applies the characteristics of the composite sheet will be described below.

(5) Application Example as Liquid Distribution Unit in Absorbent Product As shown in the perspective view of FIG. 4 (1) and the sectional view of FIG. 4 (2), the liquid distribution unit comprising the composite sheet of the present invention. Two
0 is arranged so as to be in contact with the upper surface of the sheet-shaped absorbent body 30 in which the absorption layer 31 is provided in a strip shape on the lower surface, instantaneously absorbs the discharged liquid, and absorbs the absorbed liquid in the length and width directions. It means a member that has the function of quickly distributing and diverting in the direction.

When a composite sheet is applied as such a member, in order for the composite sheet to effectively function as a liquid distribution unit, first, an extremely large number of mesh-like liquid passages are provided in the composite sheet. Must be present and the passage must be maintained even in the absorbing state of the discharged liquid. For that purpose, it is necessary to have a bulky structure and resilience, especially high resilience when wet. Materials that meet such requirements include, for example, fiber webs composed solely of 8d PET hollow conjugate fibers.

As a second condition, it is important that the permeability of the liquid into the composite sheet and the water permeability are extremely excellent so that the aqueous liquid can be instantaneously received and instantaneously discharged. Surface treatment with a surface active agent is effective for this. As the water permeability, for example, a property that 100 ml of physiological saline solution can be treated in about 20 seconds without overflowing is desired.

Thirdly, this liquid distribution unit does not need to be arranged on the entire surface of the absorber like the acquisition sheet, but may be arranged only in the vicinity of the portion corresponding to the urine discharge port. The required area is 5 to 50% of the absorber area, and in terms of absolute area, 10 cm ² or more, for example, 20 to 50 cm ² is sufficient. This also reduces the cost burden.

The liquid distribution unit is arranged close to the absorber. However, when the top sheet is separately provided, the position is changed according to the positional relationship with the top sheet.
That is, the liquid distribution unit is arranged so as to be in direct contact with the absorber, and the top sheet is arranged on it. The top sheet is arranged on the absorber, and the liquid distribution unit is arranged on the top sheet. There is a case. When the liquid distribution unit is arranged directly on the absorbent body, it is desirable to arrange the smooth nonwoven fabric layer surface on the absorbent body side and the uneven fibrous web layer surface on the topsheet side. When the liquid distribution unit is arranged on the top sheet, it is desirable to arrange the smooth non-woven fabric layer surface on the top sheet side and the fibrous web layer surface having irregularities on the body surface side.

(6) Application of Absorbent Product to Acquisition / Diffusion Layer As a typical example of application of the composite sheet of the present invention to an absorbent product, the fibrous web layer exhibits a temporary liquid storage capacity, Since it functions as a so-called acquisition layer and the non-woven fabric layer functions as a rapid liquid diffusion layer, it is possible to exhibit a multi-functionality such that it can serve as the conventional three functions of a top sheet, an acquisition sheet and a diffusion (transfer) sheet. In this case, as shown in FIG.
It is desirable to arrange the non-woven fabric layer (first surface) so as to be in close contact with the absorbent body 41 in a direction in which the fibrous web layer (second surface) is in contact with the wearer's skin. A leak preventive sheet 42 is arranged below the absorber 41.

When the composite sheet of the present invention carries SAP particles, it can be used as a new functional sheet-like absorber having an absorbing function in addition to the above-mentioned function.

(7) Application to Top Sheet A spunbonded nonwoven fabric applicable as a nonwoven fabric layer of a composite sheet generally has a filament denier of 2%.
The use of spunbond PE or PP with an average denier of ~ 3d, but with a smaller constituent denier than 1-2d, results in a softer surface touch. Therefore, when a composite sheet is prepared by using a spunbond having a soft fineness as a nonwoven fabric layer, the nonwoven fabric layer surface of this composite sheet is optimal for use as a top sheet of an absorbent product.

By adopting such a composite sheet as the top sheet, the role of the liquid distribution unit described in the item (5) can be given to the top sheet,
It is also possible to give the top sheet the role of the acquisition function described in section (6).

(8) Composite Sheet Having SAP Supported on Fibrous Web Layer FIG. 6 shows a composite sheet formed by supporting SAP particles 50 on the fibrous web layer 2 in the composite sheet 10 of the present invention. FIG. The fibrous web layer 2 of the composite sheet 10 can stably accommodate and support a large amount of SAP particles 50 in its bulky structure, that is, in the inter-tissue spaces.
Also in this case, the non-woven fabric layer 1 also works effectively as a diffusion layer and contributes to absorbing and fixing the discharged body fluid in a short time by uniformly utilizing the entire sheet. Therefore, a very excellent so-called ultra-thin absorber can be obtained.

Thus, the SAP particles 5 are added to the fibrous web layer 2.
The method of supporting 0 is suitable from various methods such as a method of spraying a powder of SAP on the web layer in a dry state, and a method of wet-coating a slurry in which SAP particles are suspended in a solvent in a fibrous web layer. Things are selected.

(9) Method for Producing Composite Sheet Obtained by Entangling with High-Pressure Water Flow Regarding the method for supporting SAP particles after the production of the composite sheet of the present invention or in the process of producing the composite sheet,
Description will be given with reference to FIG. 8 showing a flow sheet of the manufacturing process. The process adopted here is a process in which the non-woven fabric layer and the fibrous web layer are bonded by high-pressure hydroentanglement, and the SA process is used in the manufacturing process of the composite sheet.
A P-particle loading process is incorporated.

In FIG. 8, 12 g / m ² of PP spunbond (Avgol) was used as the nonwoven layer. On the other hand, PET fiber of 6d × 60 mm is used as raw cotton and is 25 g /
A m ² card web was prepared and laminated as a fibrous web layer on the non-woven fabric layer to obtain a laminated web. A water pressure of 5.0 MPa (50 kgf / c) was applied to the laminated web by using the high pressure water nozzle 60 having a nozzle interval of 15 mm shown in FIG.
m ² ) was subjected to a line entanglement process on a net to prepare a laminated web in which a nonwoven fabric layer and a fibrous web layer were entangled. The entangled laminated web was subjected to S using a curtain coater device.
A co-dispersion slurry of AP / microfibrillar cellulose was coated to give a spray rate of 180 g / m ² . The SAP slurry had the structure shown in Table 1.

[0064]

[Table 2]   Dispersion medium: Ethanol / water = 70/30 mixed system   SAP particles: Mitsubishi Chemical's Aqua Pearl average particle size 400 μm   SAP particle concentration: 25%   Microfibril shape: 0.6% (Special papermaking, S-MFC)   Cellulose concentration

The solvent was vacuum desolvated from the coated composite sheet and dried according to the flow sheet of FIG.
In this flow sheet, the non-woven fabric layer and the fibrous web layer are joined by hydroentanglement, but as described above for the method for producing the composite sheet, after the SAP particles are carried on the laminated web, the non-existence site of the SAP particles is present. The sheet may be joined by heat fusion to form a composite sheet. Hot melt can be used as a bonding agent instead of heat fusion.

The absorbent product using the composite sheet as a top sheet or the absorbent product incorporating the composite sheet obtained by supporting SAP particles has excellent absorption characteristics and has an extremely compact structure. From
Very useful for women's napkins, light / moderate incontinence pads, diapers for children / adults, etc.

[0067]

Industrial Applicability As described above, the composite sheet of the present invention is obtained by partially pressure-bonding a non-woven fabric layer having a smooth surface and a fibrous web layer having an uneven surface to form a high pressure-bonded sheet. The density region and the low-density region not pressure-bonded are mixed. Therefore, the non-woven fabric layer has,
The liquid diffusibility by the capillaries, the temporary liquid storage (acquisition) function of the fibrous web layer, and the cushioning effect are sufficiently retained. The pressure-bonded high-density region serves as a strengthened part of the physical properties of the sheet, and this sheet exerts a channel effect for liquid movement, and is used as a top sheet for various absorbent products and exhibits excellent performance.

Furthermore, in the low-density region where pressure is not applied, the bulkiness of the fibrous web layer can be used to reliably fix and hold the SAP particles in that region, which results in high performance. It can be used as an absorber sheet.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a composite sheet according to an embodiment of the present invention.

2 (1) to (3) are plan views showing pattern examples of a first network region and a second network region, which are applied to the composite sheet of the present invention.

3 (1) to (5) are plan views showing different patterns of the first network region and the second network region applied to the composite sheet of the present invention.

FIG. 4 (1) is a perspective view showing an absorbent product formed by combining the composite sheet of the present invention with a sheet-shaped absorbent body as a liquid distribution unit, and FIG. 4 (2) is an absorbent body shown in (1). It is a longitudinal cross-sectional view of a product.

FIG. 5 is a schematic cross-sectional view showing an example of arrangement with other elements when the composite sheet of the present invention is used as a top sheet of an absorbent product.

FIG. 6 is a schematic cross-sectional view showing a composite sheet constituted by supporting SAP particles on a fibrous web layer.

FIG. 7 shows a high-pressure water nozzle, (1) is a plan view, (2)
[Fig. 3] is an enlarged vertical sectional view of a part thereof.

FIG. 8 is a flow sheet showing a process in which a supporting process of SAP particles is incorporated into a process of manufacturing a composite sheet by utilizing the confounding connection by high-pressure water flow.

[Explanation of symbols]

1 Non-woven fabric layer 1a First side 2 Fiber web layer 2a Second side 10 composite sheet A First network area B Second network area 20 liquid distribution unit 30 Sheet-shaped absorber 31 Absorption layer 41 Absorber 42 Leak prevention sheet 50 SAP particles

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // A61F 5/44 A41B 13/02 SF term (reference) 3B029 BB03 BB06 BF04 4C003 BA02 BA04 BA08 GA03 4C098 AA09 CC03 DD06 DD10 DD25 DD27 4F100 AK04A AK04B AK07A AK07B AK25B AK42A AK42B AK48B AK64A AL05A BA02 BA43 DD01B DE01B DG01B DG03B DG04A DG06B DG15A DG20B EC072 EH462 EJ64A EJ64B GB72 JA13 JA13A JA14 JA20 JD02A JD14 JK15A JL12B YY00 YY00A YY00B 4L047 AA14 AA17 AA21 AA23 AA27 AA29 AB03 AB04 AB07 BA04 BA09 CA02 CA12 CA14 CA19 CB07 CB08 CC04 CC05

Claims (20)

[Claims] 1. A composite sheet comprising a laminate of a non-woven fabric layer and a fibrous web layer, wherein the composite sheet has a high density and a thin first network region and a first network region.
The second, which is low in density and thick in the network area
A composite sheet comprising a network region, the surface of the non-woven fabric layer side being a smooth surface, and the surface of the fibrous web layer side being a bulky and uneven surface. 2. The composite sheet according to claim 1, wherein the first network region and the second network region each have a strip shape and are alternately arranged. 3. The first network region has a strip shape and is arranged so as to extend so as to intersect with each other, and the second network region is arranged as a dividing layer surrounded by the first network region. The composite sheet according to claim 1. 4. The composite sheet according to claim 1, wherein the first network region is composed of a large number of small regions and is arranged in a state of being distributed in the second network region. 5. The first network region has a thickness of 1 m.
less than m and a density of 0.1 g / cm ³ or more, and the second network region has a thickness of 1 mm or more and a density of 0.1 g / c.
composite sheet according to any one of claims 1 to 4 is less than m ^3. 6. The basis weight of the entire composite sheet is 20 to 1.
It is 20 g / m < ² >, The composite sheet in any one of Claims 1-5. 7. The basis weight of the non-woven fabric layer is 10 to 50 g / m.
^The composite sheet according to any one of claims 1 to 4, wherein the composite sheet has a Gurley air permeability of 3 seconds or less as a whole. 8. The non-woven fabric layer comprises PE, PP, PET,
PE / PP, PE / PET, and PET derivative / PE
The composite sheet according to any one of claims 1 to 7, which is composed of a filament nonwoven fabric selected from the group consisting of T resins. 9. A PE having a fiber web layer having a fineness of 1.5 to 12 d or more and a fiber length of 100 mm or less.
The main component is a fiber selected from the group consisting of synthetic fiber staples of a series, a PP series, a PET series, a nylon series, an acrylic series, and a mixture thereof.
7. The composite sheet according to any one of 1. 10. The composite sheet according to claim 9, wherein the fibrous web layer includes a sheath-core type composite fiber staple having a heat fusion property. 11. The composite sheet according to claim 9, wherein the fibrous web layer contains a side-by-side type composite fiber that is crimped by heat shrinkage. 12. The composite according to claim 1, wherein at least one of the non-woven fabric layer and the fibrous web layer is subjected to a surface hydrophilic treatment for improving water wettability. Sheet. 13. A composite sheet in which the fibrous web layer according to any one of claims 1 to 12 carries SAP particles. 14. An absorbent product, comprising the composite sheet according to claim 13 as an absorbent body. 15. A composite sheet according to any one of claims 1 to 12 is provided as a top sheet, and the non-woven fabric layer surface thereof is in contact with a wearer's body, and the fibrous web layer surface is in contact with an absorbent body. Absorber products characterized by being 16. A liquid distribution unit in which the composite sheet according to claim 1 is arranged close to the surface of the absorbent so as to cover 5 to 50% of the surface of the absorbent. An absorber product characterized by being provided as. 17. The composite sheet according to any one of claims 1 to 12, wherein the composite sheet is arranged so that the fibrous web layer surface of the composite sheet is in contact with the wearer's body and the non-woven fabric layer surface is in contact with the absorbent body. An absorbent product, wherein the fibrous web layer of the sheet is adapted to act as an acquisition layer and the nonwoven web layer to act as a diffusion functional layer. 18. A non-woven fabric layer and a fibrous web layer are laminated together to form a laminated web, and then a surface shape shaping treatment is performed to make the thickness of a desired region of the laminated web thinner than that of a peripheral region, thereby forming a thin and high-profile material. A method for producing a composite sheet, comprising forming a dense first network region and a thicker and lower density second network region. 19. A plurality of first dense and thin first
A method of manufacturing a composite sheet in which a non-woven fabric layer and a fibrous web layer are joined together so that a network region and a plurality of second network regions having a relatively low density with respect to the first network region are formed. (1) A fibrous web layer having a basis weight of 10 to 50 g / m ² composed of a compounded fiber staple having a fineness of ² to 12 d on a spunbonded nonwoven fabric of 10 to 50 g / m ² as the non-woven fabric layer. To laminate to prepare a laminated web, and (2)
1. On the laminated web, with a beam spacing of 5-30 mm, 2.
A step of preparing a composite sheet by linearly joining the non-woven fabric layer and the fibrous web layer by causing a water beam of not less than 06 MPa to entangle, and (3) adding ethanol / ethanol to the composite sheet. S dispersed in an aqueous mixed solvent
And a step of forming an absorption layer by removing the solvent after applying the AP slurry, the method for producing a composite sheet. 20. A plurality of first dense and thin first
A method of manufacturing a composite sheet in which a non-woven fabric layer and a fibrous web layer are joined together so that a network region and a plurality of second network regions having a relatively low density with respect to the first network region are formed. (1) a fibrous web layer having a basis weight of 10 to 50 g / m ² composed of synthetic fiber having a fineness of ² to 12 d on a spunbonded nonwoven fabric of 10 to 50 g / m ² as the non-woven fabric layer. A step of laminating to prepare a laminated web, and (2) by spreading the SAP particles in a band shape on the laminated web at predetermined intervals, the SAP particle-existing portions and the SAP particle-non-existing portions are alternately present. A step of preparing a SAP-supporting laminated web, and (3) the SA of the SAP-supporting laminated web.
By selectively crimping the non-existing site of P particles,
A step of joining the fibrous web layer and the non-woven fabric layer to each other to form the densified layer.