JPH04136295A - Bulky nonwoven fabric and its production - 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] [Industrial application field]

The present invention relates to a high-strength nonwoven fabric that is bulky, has excellent drapability, and has good texture.

[Conventional technology]

Conventionally, manufacturing nonwoven fabrics using short fibers such as polyester fibers or polyester fibers and polyvinyl alcohol fibers by a papermaking method has been described, for example, in Japanese Patent Publication No. 49-8809, Japanese Patent Application Laid-Open No. 57-82599, and Japanese Patent Application Laid-open No. 57-8259. -82
No. 599, Japanese Patent Publication No. 61-15693, Japanese Patent Application Laid-open No. 60-34700, Japanese Patent Application Laid-Open No. 1-118700, etc. also disclose that non-woven fabrics are made from polyester fibers or polyester fibers and polyvinyl alcohol fibers by a papermaking method, The production of high-strength nonwoven fabrics by high-pressure hydroentanglement treatment is described in, for example, Japanese Patent Publication No. 56-48628, Japanese Patent Publication No. 43464-1982, and Japanese Patent Publication No. 26860-1986, etc. It has been proposed in JP-A-2-6651 and JP-A-2-127552 to form a nonwoven fabric using a papermaking method and subject it to high-pressure hydroentanglement treatment.

[Problem to be solved by the invention]

High-strength nonwoven fabrics can be manufactured by applying high-pressure water jet treatment to fiber webs obtained by conventional papermaking methods, but the water jet treatment traces remain in streaks, uneven density, and unevenness occur, making it difficult to maintain uniformity. However, it was difficult to obtain a fiber-entangled nonwoven fabric with good texture. The object of the present invention is to provide a high-strength nonwoven fabric with uniform fiber entanglement, excellent bulkiness and drapability, and good texture.

[Means to solve the problem]

The present invention comprises 98 to 45% by weight of polyester fibers and/or self-crimping polyester fibers, heat-fusible fibers,
Fiber length consisting of at least 30% by weight or less each of at least one type of fiber selected from fine fibers split from multicomponent splittable fibers containing cellulose fibers and polyester fine fiber components as one component, and a total of 2 to 55% by weight. A wet-processed fiber web of single fibers of 3 to 3 On+m is a nonwoven fabric in which the fibers are highly entangled by high-pressure water treatment, and the apparent density of the nonwoven fabric is 0.
03 to 0.25 g/cm3, and a breaking length of 0.2 km or more. Further, the present invention includes 98 to 45% by weight of polyester fibers and/or self-crimping polyester fibers, 0.5 to 5% by weight of binder fibers that become water-soluble when dried after papermaking, and/or 0% by weight of heat-fusible fibers. ~25% by weight, and at least 30% by weight each of at least one type of fiber selected from multicomponent splittable fibers containing cellulose fibers and polyester fine fiber components as one component, a total of 1 to 50% by weight. Each short fiber with a length of 3 to 30 mm is formed into a fibrous web by a papermaking method, and one side of the fibrous web is treated with high-pressure water jet on a reticular support at a rate of 10 to 35 meso/unit, and the other side is treated with high pressure water jet at a rate of 60 to 150 meso/unit. The fibers are highly entangled by high-pressure water jet treatment on a net-like support, and the apparent density of the nonwoven fabric is 0.03 to 0.25.
This is a method for producing a bulky nonwoven fabric, characterized in that the fabric has a breaking length of 02 m or more. , 5-sodium sulfoisophthalate copolymerized copolymerized polyesters such as polyethylene terephthalate, non-shrinkable fibers or high shrinkage fibers obtained by single spinning polyesters such as polybutylene ethylene terephthalate, and thermally processed fibers obtained from the above polyesters. Spontaneous crimping polyester fibers obtained by composite spinning two types of polyesters with different properties in a side-by-side type or eccentric core-sheath type, or their irregular cross-section fibers, and the resulting fibers are drawn, Fineness of 0.5 obtained by adding crimp as necessary
It is a polyester fiber with a denier of ~6 denier and a fiber length of 3 to 30 mm. Among the fibers mixed with polyester fibers, binder fibers (hereinafter referred to as solubilized fibers) that become water-soluble when dried after papermaking are
For example, the fiber described in JP-A-2-68396 is a binder fiber selected from modified polyvinyl alcohol fiber, modified vinyl alcohol copolymer fiber, modified polyvinyl pyrrolidone fiber, and These fibers become water-soluble during the drying process. Furthermore, the heat-fusible fiber is a polymer in which, among the polymer components constituting the fiber, the melting point of the polymer component constituting at least a portion of the fiber surface is at least 20°C lower than the melting point of the other polymer components. A composite fiber consisting of, for example, a high-melting point component/low-melting point component of polyethylene terephthalate/hexamethylene terephthalate copolyester, iso7-thaleate copolyester, polyethylene terephthalate/
Composite fibers such as polyolefin polymers, nylon-66 or nylon-6/nylon-11 or nylon-12 or modified nylon, polypropylene/polyethylene polymers, or polymers with a melting point at least 20°C lower than the melting point of the main fiber. Fibers consisting of, for example, hexamethylene terephthalate copolyester, inphthalate copolyester, unoriented polyethylene terephthalate, polybutylene terephthalate, nylon.
11 Nylon-12, polypropylene, polyethylene and 2 are single polymer fibers selected from ethylene copolymers or the like or mixed fibers of two or more types of polymers. Furthermore, the multi-component splittable fiber containing the polyester fine fiber component as the l component is a polymer having poor affinity with polyester, such as 6-nylon, 6-row nylon, 610-
A multi-component splittable fiber obtained by combining polymers selected from polyamides such as nylon, 11-nylon, and 12-nylon, polypropylene, etc., and joining composite spinning so that each polymer becomes at least a plurality of fine fibers. It is. These fibers are stretched and mechanically crimped as necessary:
It is a short fiber with a fineness of 1 to 6 deniers and a fiber length of 3 to 30 mm. The mixing ratio of these fibers is as follows: ■ polyester fiber and/or spontaneously crimpable polyester fiber is 98~
45% by weight, ■ Binder fiber that becomes water-soluble after papermaking (
0.5-5% by weight of solubilized fibers) and/or 0-25% by weight of heat-fusible fibers. , (2) multi-component splittable fibers containing cellulose fibers and/or polyester fine fibers as one component, each having a fiber composition of θ~30% by weight, totaling 1~55%. This fiber composition is determined based on the desired use of the nonwoven fabric, but if the blended amount of solubilized fibers and heat-fusible fibers is outside the above range, the nonwoven fabric will harden or adversely affect high-pressure water treatment, so it is not preferable (・.Depending on the purpose of the nonwoven fabric, cellulose fibers may be blended to impart water absorption properties, or multi-component splittable fibers may be blended and at least a portion of the fibers split using high-pressure water treatment to create fine fibers. is interposed in the nonwoven fabric to increase the degree of fiber entanglement, resulting in high strength and good texture, or by mixing spontaneous crimp fibers to increase the degree of fiber entanglement, improving bulk and texture. In addition, cellulose pulp may be mixed into paper. In the production of a wet-processed fiber web, a fiber composition mainly composed of polyester fibers is dispersed in water at room temperature or heated and beaten. is dispersed in water to prepare a slurry for papermaking, and if necessary, it is passed through a vibrating screen and a dust removal device, and then processed using a papermaking method such as a Fourdrinier Yankee type or a circular net Yankee type to produce a papermaking method with an average weight of 10 to 300 g/m. A fibrous web is made.The obtained fibrous web is dried as necessary, and the form of the fibrous web is stabilized by performing heat treatment such as melt bonding of the thermal binder fibers and crimping.High-pressure water flow of the fibrous web The treatment is to reduce the fibrous web from 10 to 35
60-15 on one side and 60-15 on the other side on the mesh net support.
Each treatment is carried out at least once on a mesh support of 0 mt. If the mesh of this net-like support is outside the above range or is the same, water flow trajectories may remain, impairing the appearance, impairing the bulkiness of the nonwoven fabric, and causing uneven entanglement of fibers and uneven physical properties. So I don't like it. In high-pressure water treatment, the nozzle diameter, spacing, arrangement, nozzle vibration width, rocking speed, traveling speed of the object to be treated, water pressure, etc. are determined by the fiber length, thickness, elasticity, etc.
Although it is appropriately selected depending on the weight of the fiber web, etc., the nozzle diameter is usually 0.08-0. At least one water jet treatment is performed on both sides of the fibrous web at a water pressure of 10 to 200 Kg/cm" at a water pressure of 10 to 200 Kg/cm. Preferably, the treatment is performed multiple times by increasing the water pressure sequentially to obtain a fiber-entangled nonwoven fabric. Apparent density of 0.08~0-25 g/cm
'Process until the fracture length is 0.2 km or more. Next, the nonwoven fabric containing heat-fusible fibers is heat-treated as necessary to bond and fix the fibers and to develop crimp. The fiber-entangled nonwoven fabric obtained in the present invention has excellent texture, texture, and surface abrasion resistance due to its uniform dispersion and entanglement of fibers with few water flow trajectories and surface irregularities, and is bulky and has high strength. It is a non-woven fabric. This nonwoven fabric is suitable for use in underwear, medical supplies, wiping cloths, sanitary materials, 7A/N materials, interlining for clothing, base materials for synthetic leather, and the like.

[Function] The present invention uses binder fibers that become water-soluble when dried after papermaking to produce a fibrous web, and when treating with a high-pressure water stream, one side of the fibrous web is placed on a 10 to 35 mesh mesh support. By coating the opposite side on a mesh support with a density of 60 to 150 mm/y, hydroentanglement treatment can be performed without impairing the bulk of the fiber web, reducing uneven contact with the water flow and forming a nonwoven fabric. Since there are few water flow trajectories remaining and the fibers are entangled uniformly, a fiber entangled nonwoven fabric with good texture, bulkiness, and high strength can be obtained. [Examples] Next, the present invention will be explained with specific examples. Note that parts and percentages in the examples are by weight unless otherwise specified. Example 1 Stretched fineness 1.5 dr, number of crimps 19/25+n+
n, 95 parts of polyethylene terephthalate fiber with a length of 1M and a length of 10 mm and a sticky agent of 0.01 g/Qf: TAPPI
Disperse in water using a standard disintegrator to make a slurry with a fiber concentration of 0.5%, then add 5 parts of modified polyhinyl alcohol fiber (solubilized fiber) with a fineness of 1 dr and a fiber length of 3 I to prepare a slurry for papermaking. Then, a fibrous web having an average weight of 30 g/m' was obtained by paper making using a TAPPI standard square paper making machine. This fibrous web was dried at a temperature of 110°C, and then the net-like support of the fibrous web was processed from one side with a wire mesh of 20 mesonyu, and from the opposite side was treated with a wire mesh of 80 mesonyu. Using wire mesh, the first stage is 3
After water treatment was performed alternately on both sides of the fiber web three times under the conditions of a water pressure of 0 Kg/cm", 50 Kg/cm" in the second stage, 70 Kg in the third stage, and a processing speed of 15 a+m/min, the fibers were entangled. The laminated nonwoven fabric was dried at 130° C. The performance of this nonwoven fabric is shown in Table 1. Comparative Example 1.2 Practical Example 1
) Hydroentanglement treatment was carried out under the same conditions as in Example using wire mesh of 207 mm/unit on both sides and (2) wire mesh of 80 mm/unit on both sides. Table 1 shows the performance of the obtained fiber entangled nonwoven fabric.
It was shown to. (Margin below) Table 1 Evaluation symbol ◎ Excellent, ×: Bad. That is, the nonwoven fabric of one example had good fiber entanglement properties, good surface smoothness, and a firm and round texture, making it suitable for use in mesocal clothing. On the other hand, the nonwoven fabric of the comparative example had a stiff, paper-like texture, and the surface had large irregularities due to the trajectory of water treatment. Example 2 Fineness 2dr, ts shrinkage number 19 pieces/25mm, fiber length 10
55 parts of mm polyethylene terephthalate fiber, fineness 2
d", High shrinkage polyethylene terephthalate with a fiber length of 10 mm, 25 parts of fibers, heat-fusible fibers and a core component [the mold is made of polyethylene terephthalate, and the sheath component polymer is made of hexamethylene isophthalate copolymerized polyester. A fiber composition of 15 parts of core-sheath composite fibers and 0.01 g/Q of adhesive were dispersed in water using a TAPPI standard disintegrator to obtain a fiber concentration of 1%.
A slurry for paper making was prepared by adding 5 parts of modified polyvinyl alcohol fibers with a fineness of 2 dr and a fiber length of 5 ram, and the slurry was made using a TAPP l standard square paper making machine to obtain a fiber web with an average weight of 50 g/m2. Ta. Three sheets of this fibrous web were laminated, and one side was treated on a 16 mm wire mesh as a mesh support, and the opposite side was treated on a 115 mm wire mesh three times under the conditions of Example 1. . After drying, the obtained nonwoven fabric was heat-treated in a heating zone at 150° C. for 2 minutes to shrink the nonwoven fabric and bond and fix the fibers using the heat-fusible fibers. Table 2 shows the performance of the obtained nonwoven fabric. This non-woven fabric has almost no noticeable traces of water flow and has good fiber entanglement, so it has excellent strength and abrasion resistance, has good texture and texture, and has no surface fuzz, making it suitable as a base material for synthetic leather. . Example 3 70 parts of polyethylene terephthalate fiber with a fineness of 1 dr, the number of crimps/25 mm, and a fiber length of 5 mm, a splittable fiber with a fineness of 3 dr and a fiber length of 10 mm (combined of polyethylene terephthalate component and 6-nylon component) Alternately bonded composite fiber) 25 parts, fineness 2dr, fiber length 511Im
A fiber composition containing 5 parts of modified polyvinyl alcohol-based solubilized fibers was made into paper under the same conditions as in Example 1, and an average mold size of 140 g/
A fibrous web of 500 mm in diameter was obtained. Three of these fibrous webs were laminated and subjected to hydroentanglement treatment under the conditions of Example 1. In the fiber entangled nonwoven fabric, the splittable fibers became fine fibers, and the fibers of the nonwoven fabric were The performance of this nonwoven fabric is shown in Table 2. This nonwoven fabric has inconspicuous water flow trails and good 1III bonding, so it has excellent strength and abrasion resistance, and has a smooth feel and texture. It had a good texture and was suitable for use as a wiping cloth.Example 4 67 parts of polyethylene terephthalate fiber with a m degree of 2 dr, lal#-length 7+++ m, 25 parts of spontaneously crimpable polyester fiber 1G with a fineness of 2 dr, 1a II 1. length 10 + II m,
A fiber composition containing 5 parts of polyester core-sheath type heat-fusible fibers was dispersed in water as in Example I to make a slurry with a fiber concentration of 1%, and a modified polyhinylalfur-based fiber composition having a fineness of 2 dr and a fiber length of 5 a+m was prepared. A slurry prepared by adding 3 parts of solubilized fibers was made into a paper to obtain a fibrous web having an average weight of 35 g/m2. This fibrous web was laminated with the fibrous web obtained in Example 3, and subjected to hydroentanglement treatment under the same conditions as in Example 2. After drying, the obtained nonwoven fabric was heat-treated in a heating zone at 35° C. for 2 minutes to develop crimping of the fibers and to bond and fix the fibers with the heat-fusible fibers. Table 2 shows the performance of the obtained nonwoven fabric. The second nonwoven fabric was bulky, had good fiber entanglement, was excellent in strength and abrasion resistance, had good texture and texture, and had no surface fuzz, and was suitable as a base material for nonwoven clothing. Example 5 Fineness: 1 dr, number of crimps: 13/25 mm, fiber length: 5 mm
57 parts of polyethylene terephthalate fiber, mechanically crimped rayon yarn with a fineness of 1.5 dr and a fiber length of 5 mm
The same fiber composition as in Example 1 (dispersed in water to a fiber concentration of 1%) was prepared using the same fiber composition as in Example 1, including 20 parts of spontaneously crimpable polyester fibers with a fineness of 2 dr and a fiber length of 10+ nm, and 5 parts of polyester core-sheath type heat-fusible fibers. slurry, fineness 2dr, fiber length 5m
A slurry prepared by adding 3 parts of modified polyvinyl alcohol-based solubilized fiber of m is made into paper to give an average weight of 35 g/m
A fibrous web was obtained. Table 2 shows the performance of the fiber-entangled nonwoven fabric obtained by laminating three sheets of this fiber web and subjecting it to hydroentanglement treatment under the conditions of Example 1, drying, and heat treatment. This nonwoven fabric has excellent bulk, good fiber entanglement, excellent strength and abrasion resistance, smooth texture, good texture, and water permeability, making it suitable for use in underwear and wiping materials.

【Effect of the invention】

The fiber-entangled nonwoven fabric obtained in the present invention has fewer trajectories during water treatment, has good fiber dispersion and entanglement, has excellent texture, texture, drapability, and surface abrasion resistance, and is bulky and highly strong. It is. This fiber-entangled nonwoven fabric can be used in underwear, medical supplies, wiping cloths, sanitary materials, fading materials, clothing interlining,
Suitable for use as base material for synthetic leather, etc. Clara Patents Co., Ltd.

Claims (1)

[Claims] (1) Fine particles divided from multicomponent splittable fibers containing 98 to 45% by weight of polyester fibers and/or self-crimping polyester fibers, and heat-fusible fibers, cellulose fibers, and polyester fine fiber components. At least one type of fiber selected from fibers, each 30% by weight or less, total 2 ~
A nonwoven fabric in which a single fiber wet-processed fiber web consisting of 55% by weight and a fiber length of 3 to 30 mm is highly entangled with fibers by high-pressure water treatment, and the nonwoven fabric has an apparent density of 0.03 to 30 mm.
A bulky nonwoven fabric having a weight of 0.25 g/cm^3 and a tearing length of 0.2 km or more. (2) Polyester fiber and/or spontaneous crimp polyester fiber 98-4
5% by weight, 0.5 to 5% by weight of binder fibers that become water-soluble when dried after papermaking, and/or 0 to 5% of heat-fusible fibers.
25% by weight, at least one type of fiber selected from multicomponent splittable fibers containing cellulose fibers and polyester fine fiber components as one component, 30% by weight each, total 1 to 50%.
Short fibers with a fiber length of 3 to 30 mm are formed into a fiber web by a paper-making method, and one side of the fiber web has a fiber length of 10 to 30 mm.
High-pressure water jet treatment was performed on the mesh support, and the opposite side was treated with 6
The fibers are highly entangled by high-pressure water jet treatment on a mesh support of 0 to 150 mesh, and the apparent density of the nonwoven fabric is reduced to 0.0.
3 to 0.25 g/cm^3 and a breaking length of 0.2 km or more. A method for producing a bulky nonwoven fabric.