JPS62236730A - Raising composite nonwoven fabric - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a raised composite nonwoven fabric. For more details,
The present invention relates to a raised composite nonwoven fabric that can be suitably used as clothing materials such as interlining and outer materials for clothing, base fabrics for poultice materials, sanitary materials such as bandages, interior materials, and the like.

[Prior art] Electrostatic flocked fabrics and nonwoven fabrics partially heat-sealed with webs have been used as clothing materials, sanitary materials, and interior materials that require a soft touch, and the surface of the nonwoven fabrics has been treated with brushing (Utility Model Publication No. 80-342).
67 Publication) etc. are used.

The electrostatic flocked fabric has excellent feel and flexibility, but has low abrasion resistance, and requires special equipment for electrostatic flocking during production, resulting in high production costs. There is.

In addition, the fabrication process of a raised nonwoven fabric made by partially heat-sealing the web is simple, but the fibers in the heat-sealed portion essentially melt and form a film, resulting in a stiff texture. Moreover, since fibers other than the raised fibers are fixed by this heat-sealed part, they have poor elasticity.

Furthermore, if the amount of napping is increased, the strength of the fabric will be weakened and its abrasion resistance will be reduced, and conversely, if the amount of napping is reduced, the texture will be stiffer and less elastic. It is not possible to satisfy the strength and abrasion resistance of cloth at the same time.

[Problems to be Solved by the Invention] The inventors of the present invention have conducted extensive research to solve these problems with conventional raised materials. We have discovered a raised composite nonwoven fabric that satisfies both strength and abrasion resistance, and have completed the present invention.

[Means for Solving the Problems] That is, the present invention laminates a thermoplastic sheet material and a web layer made of fibers having a higher melting point than the thermoplastic sheet material, and partially laminates this from the fibrous web layer side. The present invention relates to a raised composite nonwoven fabric obtained by heat-sealing the web layer and raising the surface of the web layer.

[Operations and Examples] The raised composite nonwoven fabric of the present invention is produced by laminating a thermoplastic sheet material and a web layer made of fibers with a higher melting point than the thermoplastic sheet material, and partially laminating this from the fiber web layer side. After heat-sealing, the web layer is obtained by raising the surface of the web layer.

The thermoplastic sheet material used in the present invention has elasticity and has a melting point lower than that of the constituent fibers of the web, such as polyurethane, polyether ester block copolymer,
Examples include nonwoven fabrics made of fibers made of polyester elastomers such as polybutylene ethylene phthalate; films made of elastic resins such as polyurethane, polyether ester block copolymers, and polyester elastomers such as polybutylene ethylene phthalate. However, these thermoplastic sheet materials whose melting point is 5° C. or more lower than the melting point of the constituent fibers of the web layer can be suitably used.

In addition, when used in clothing materials that require breathability, nonwoven fabrics in which thermoplastic filaments with voids between fibers are integrated are preferably used.

The fibers forming the web layer used in the present invention include synthetic fibers such as polyester, polyamide, polyolefin, and acrylic, recycled fibers such as rayon, and natural fibers such as cotton and wool, which have a higher melting point than the thermoplastic sheet material. , those having substantially no melting point can be mentioned, and these materials are appropriately selected and used depending on the purpose. Among the above-mentioned fibers, those having a melting point that do not melt at a temperature 5° C. or more higher than the melting point of the thermoplastic sheet material can be preferably used. As a method for forming a web layer using the fibers, a normal web forming method such as a carding method can be employed.

Next, the thermoplastic sheet material and a web layer made of fibers having a higher melting point than the thermoplastic sheet material are laminated, but the web layer may be laminated on one surface of the thermoplastic sheet material; A thermoplastic sheet material may be used sandwiched between two web layers. The laminated thermoplastic sheet material and the web layer are integrated by partially heat-sealing them from the fibrous web layer side. Such heat fusion may be performed, for example, at a temperature of 120 to 240°C, <160 to 2
A linear pressure of 10=100 is applied from at least the web layer side using a heating means such as an embossing roll heated to about 00°C.
kg/c+n, the thermoplastic sheet material is melted at the heat welding part, the fibers of the web layer are embedded therein, and in that state it is cooled and
The heating temperature and heating time are usually adjusted to solidify. Here, when heating from the web layer side, even if the fibers of the web layer are softened or melted and deformed together with the thermoplastic sheet material at the heat-fused portion, the web layer and the thermoplastic sheet material may As long as the fabric is sufficiently fused and the texture is not hardened, the resulting raised composite nonwoven fabric will have a mechanical strength that is satisfactory for practical use. good.

In addition, when heat fusion is performed from the thermoplastic sheet material side, the melting point of the thermoplastic sheet material is lower than that of the web layer, so the molten thermoplastic sheet may adhere to the heating means, so the web layer It is preferable to heat from the side.

The proportion (area) occupied by the thermally fused portion at the interface between the web layer and the thermoplastic sheet is preferably 5 to 35%. If the proportion of such heat-sealed parts is less than 5%, the mechanical strength of the web layer and the thermoplastic sheet will decrease, as well as the abrasion resistance, and if the proportion is more than 35%, it will cause a raised appearance. The texture of the composite nonwoven fabric becomes hard. In addition, the shape of the heat-fused part may be, for example, dotted, linear, circular, triangular,
The shape may be any shape, such as a quadrilateral or other polygon, and is determined as appropriate depending on the purpose and use.

The raised composite nonwoven fabric of the present invention can be changed by raising the surface of the web layer of the composite nonwoven fabric in which the web layer and thermoplastic sheet obtained as described above are fused together.

Raising is usually done using a raising machine, but the fibers in the portions of the web layer that are not heat-sealed to the thermoplastic sheet are
In order to obtain a composite nonwoven fabric with excellent texture, it is preferable to remove it.

The raised composite nonwoven fabric of the present invention thus obtained has a soft texture and is highly elastic, and also satisfies the strength and abrasion resistance of a fabric, so it can be suitably used as clothing materials, sanitary materials, interior decoration materials, etc. It will be done.

Next, the raised composite nonwoven fabric of the present invention will be explained in more detail based on Examples, but the present invention is not limited to these Examples.

Example 1 A spunbond nonwoven fabric made of polyurethane (fabric weight: 50 g/m2) was placed between two layers of web (fabric weight: 25 g/m2) made of nylon fibers (fineness: 1 denier, melting point: 220°C).
m2, melting point: 190"C), then 185℃
The web layer and the thermoplastic sheet material were partially fused using an embossing roll having dotted protrusions heated to .

When the area ratio of the fused portion of the obtained composite nonwoven fabric was measured, it was found to be 1%.

Next, both surfaces of this composite nonwoven fabric were brushed using a napping machine, and sheared so that the nap length was 1.5 tars.

The raised nonwoven fabric thus obtained had a soft feel with excellent touch, had a residual strain rate of 2.5% or less in all directions, and exhibited excellent elasticity. Furthermore, it had excellent tensile strength and tear strength, and because the fibers of the web layer were firmly fused to the thermoplastic sheet material at the fused portion, it exhibited excellent abrasion resistance.

The residual strain rate of the resulting raised composite nonwoven fabric was determined by the following measurement method.

(Method for measuring residual strain rate) The obtained raised composite nonwoven fabric was cut into 5 cm x 15 cm to prepare a test piece, and the distance between chucks was set to 10 using Tensilon (manufactured by Toyo Baldwin ■, product number: CR).
-7000> at a tensile speed of 300 mm/sin, and then the tension was released when the length was 40% of the original length, which was repeated 10 times in a row. The value divided by the length and expressed as a percentage is the residual strain rate.

Example 2 Nylon fiber (fineness: 1.5 denier, melting point = 220°C
) and 40% by weight of polyester fiber (fineness: 1.5 denier, melting point: 255°C) (
An embossing roll having point-shaped convex portions, which is made by laminating a spunbond nonwoven fabric made of polybutylene terephthalate (fabric weight: 30 g/m2, melting point: 190°C) on a web layer (fabric weight: 20 g/m2) and heated to 185°C from the web layer side. The web layer and the spunbond nonwoven fabric were partially fused using the following method.

The area ratio of the dotted fused portions of the obtained composite nonwoven fabric was measured and found to be 9%.

Next, the web layer side of this composite nonwoven fabric was brushed and sheared in the same manner as in Example 1.

Polyamide resin (melting point: 110° C.) was applied in dots to the spunbond nonwoven fabric side of the raised nonwoven fabric thus obtained so that the amount of adhesion was IM′/m 2 to prepare an adhesive interlining.

This interlining had a soft feel, a residual strain rate of 3% or less in both the vertical and horizontal directions, and exhibited excellent elasticity. It also has excellent tensile strength and tear strength, making it suitable for use as an adhesive interlining that requires moldability and shape retention.

Example 3 Polyester fiber (fineness: 3 denier, melting point = 225°C
) 55% by weight and rayon fibers (fineness: 3 denier), a urethane film (fabric weight: 30 g/m2, melting point: 185°C) was laminated on a web layer (fabric weight: 40 g/m2), and the temperature was heated to 185°C from the web layer side. The web layer and the urethane film were partially fused together using a heated embossing roll having mesh-like projections.

The ratio of the area occupied by the mesh-like fused portion of the obtained composite nonwoven fabric was measured and found to be 22%.

Next, the web layer side of this composite nonwoven fabric was brushed and sheared in the same manner as in Example 1.

The raised nonwoven fabric thus obtained had a raised appearance in the form of a net pattern with an engraved roll pattern on the web layer side, and could be suitably used as an interior material.

Comparative Example 1 A web layer (fabric weight: 50 g/m2) made of nylon fibers (fineness: 1 denier, melting point: 220°C) was partially fused using an embossing roll having dotted protrusions heated to 200°C. Ta. The ratio of the area occupied by the fused portion of the obtained nonwoven fabric was measured and found to be 18%.

This nonwoven fabric had low tensile strength and tear strength, and could not be uniformly brushed to improve its appearance.

Furthermore, the residual strain rate was as high as 23%, and sufficient elasticity could not be obtained.

[Effects of the Invention] The raised composite nonwoven fabric of the present invention has excellent abrasion resistance as well as excellent tensile strength and tear strength because the raised fibers are fixed to the thermoplastic sheet material at the heat-sealed part. In addition, the surface of the web layer is brushed, giving it an excellent feel.The fibers of the web layer are virtually unconnected, giving it excellent drapability and making it ideal for thermoplastic sheet materials. It has elasticity depending on the degree of elongation.

In addition, because the shape, size, and arrangement of the heat-sealed part can be easily selected, raised composite nonwoven fabrics with various patterns depending on the purpose and use can be used, and clothing with a sense of volume and heat retention can be created. It can be suitably used as a material, a sanitary material, and even as a clothing material, an interior material, etc., which has an excellent surface texture and has a velvet-like appearance.

In addition, especially those using film la as thermoplastic sheet material prevent the occurrence of reverse bleeding of molten resin.
It can be suitably used as an adhesive interlining.

Claims (1)

[Scope of Claims] 1. After laminating a thermoplastic sheet material and a web layer made of fibers with a higher melting point than the thermoplastic sheet material and partially heat-sealing them from the fiber web layer side, the web A raised composite nonwoven fabric made by raising the surface of the layers. 2. The raised composite nonwoven fabric according to claim 1, wherein the raised composite nonwoven fabric has a residual strain rate of 10% or less. 3. Claim 1 or 2, wherein the thermoplastic sheet material is a nonwoven fabric made of stretchable thermoplastic fibers.
The raised composite nonwoven fabric described in Section 1. 4. The raised composite nonwoven fabric according to claim 1 or 2, wherein the thermoplastic sheet material is a stretchable thermoplastic resin film.