JPS59168159A - Highly elastic 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 Technical Field The present invention relates to a polyester nonwoven fabric having a high degree of elastic repulsion.
Relating to a nonwoven fabric that is composed of composite fibers made of a polyester component with a pA or higher, the entanglement points of the composite fibers are fused with a low melting point polymer, and that has both a high degree of elastic recovery and a soft texture. It is something.

BACKGROUND OF THE INVENTION Conventionally, nonwoven fabrics have been manufactured using various fabrication methods. Various methods have been developed, including a method in which short fibers are formed into a sheet using a carding machine and then bonded between the fibers, and a method in which the short fibers are formed into a sheet immediately after spinning (spunpond method). However, all of the nonwoven fabrics that have been produced so far have had poor elastic recovery properties, and their applications have been limited.Particularly in the field of filling for shorts and clothing, functionality has been limited.

In terms of fit, there is a need to develop nonwoven fabrics that are soft to the touch, highly flexible, and have good elastic recovery.
Attempts have been made to develop various highly elastic nonwoven fabrics.

For example (1) Non-woven fabric using false twisted yarn (2)
Nonwoven Fabric Using Funshgate Type Filament (3) Various nonwoven fabrics have been proposed, such as a nonwoven fabric in which latent crimp filaments are cross-arrayed and bonded.

However, each of these has several drawbacks, and the reality is that a nonwoven fabric that has good elastic recovery, is highly flexible, and has a soft feel has not been obtained.

That is, in the case of +1+, strong crimp makes it difficult to pass the card through, making it difficult to obtain a uniform nonwoven fabric. In addition, in the case of (2), since the filament is made of laminated layers θξ, delamination is likely to occur due to expansion and contraction, and since the fibers are oriented in one direction, the directionality of elasticity is significant, and for certain applications It is difficult to put it into practical use (・.On the other hand, in the case of (3), it is (1) from the aspect of uniformity 2 elastic recovery and direction +1.

Although it is better than method (2), there are problems in terms of equipment and productivity, and a space is created near the bonding point (= 1), which is the cooling point for cotton padding for clothing. The present inventors have solved such non-uniformity, directionality of elasticity, structural defects, unfavorable texture for clothing, etc.
As a result of intensive research, we have developed a flexible non-woven fabric with elastic recovery and a soft texture that can be used in the field of padded cotton for sports clothing, which requires functionality and fit. This led to the development of a new high-elastic nonwoven fabric.

The composition of the invention (that is, the present invention comprises [5-sulfoisophthalic acid copolymerized polyester (A) and polybutylene terephthalate (B) as two components, and the ratio of the two components is 70/30 to 30/70] A nonwoven fabric in which the entanglement points of a web made of eccentric sheath-type composite scarlet I fibers having a melting point difference of 20 to 40°C are point-bonded with a low melting point polymer (C), comprising (1) composite fibers; The fineness is 1 to 10 denier, the number of crimps is 10 to 50 strands/inch, and the degree of crimp is 25 to 50 qb1 (2) The melting point of the low melting point polymer is 40 to 90°C lower than the low melting point component of the composite fiber, making it a nonwoven fabric. A highly elastic nonwoven fabric characterized in that the content is 3 to 30% by weight, (3) the electric property of the nonwoven fabric is 18 to 32i/J, and the recovery elastic force is 10 to 50g.

In the present invention, 5-sulfoisophthalic acid copolymerized polyester (A) refers to 5-sulfoisophthalic acid copolymerized with 2 mol% of 5-sulfoisophthalic acid.
It is a polyester copolymerized with JN, and the polyester may contain polyethylene terecrate or polybutylene terephthalate or units thereof in an amount of 80 moles or more, or may be a copolymer thereof.

When containing 80 moles or more of Sowara units, the remaining copolymerization components include dibasic acids such as adipic acid, sebacic acid, and isophthalic acid or derivatives thereof, oxyacids such as oxybenzoic acid, metal salts of sulfonic acids, and diethylene glycol. , propylene glycol, polyethylene glycol,
Glycols such as pentaerythritols may be used.

Conventionally known spinning methods and drawing methods may be used to produce a composite fiber containing 5-sulfoisophthalic acid copolymerized polyester (A) and polyethylene terephthalate (n) as two components. Additives such as matting agents, gloss improvers, and antistatic agents may be added to the composite fiber, and the fiber cross section is not limited to a circular cross section, but may also be a triangular cross section or other irregular cross section, and of course, a hollow cross section, It's good to wear.

5-Sulfoisophthalic acid copolymerized polyester (Human) and polybutylene terephthalate (B) are composite spun into an eccentric core-sheath type. degree 25-51
In order to express attack, two ingredients A are required.

The composite ratio of B is within the range of 70/30 to 30/70, preferably 60/40 to 40/60,
The melting point difference between the two components A and B must be within the range of 20 to 40°C. If it is outside these ranges, crimp will hardly occur. Even if it were to develop, it would be impossible to obtain crimp characteristics within the desired range.

The average fineness of the composite short fibers obtained in this manner is preferably 1.0 denier or more and 10.0 denier or less. More preferably, it is 1.5 tenier or more and 6 denier or less. 10
If it exceeds 0 denier, the texture will be rough and the heat retention will be low when it is made into a nonwoven fabric. On the other hand, if it is less than 1.0 denier, the passability of the card when it is made into a web is poor, and the unevenness of the web is large. In addition, the elasticity when made into a non-woven fabric deteriorates.

The raw cotton obtained in this way was processed into a car by a conventional method. to form a web.

Next, needling is applied to the web. Needling may be performed in a needle room, and the insertion depth, implantation density, etc. can be arbitrarily selected.

Further, in the present invention, it is necessary to fuse and fix the intertwined points between the fibers. These are carried out by heat-sealing with a thermoplastic low melting point polymer. This low-melting point polymer can be an olefin-based or polyester-based copolymer with polyethylene, polypropylene, etc.2), but the needles of the low-melting point polymer should be used in a range of 9 to 30 weight percent relative to the nonwoven fabric. is required, more preferably 10 to
Power with 20 weights. If this amount is too small, there will be insufficient bonding points between the fibers, which will cause the fibers to slip through during elongation and deteriorate the elastic recovery properties of the nonwoven fabric. Because there are too many binding points, elongation is insufficient and when the fiber is stretched at a constant rate, deformation and breakage of the fibers occurs, resulting in a decrease in elastic recovery.

Kowara's thermoplastic low melting point polymer can be used in the form of powders or fibers, but preferred methods of mixing them into the web include spraying the powder, transfer method, or mixing low melting point fibers with raw cotton. A good method is to blend low melting point fibers with latent crimpable fibers.

The thermoplastic low melting point polymer must have a lowest melting point of 40 to 90°C, more preferably 50 to 8°C lower than the lowest melting point of the homopolymer constituting the composite fiber. If this melting point is too low, the nonwoven fabric will have r! When heat treatment A is carried out, the melt viscosity of the low melting point polymer is significantly reduced and the melt of the low melting point polymer flows down inside the nonwoven fabric, impairing the uniformity of the surface of the nonwoven fabric. If it is too high, the low melting point fibers will be fused and fixed in their fibrous state, resulting in a crosslinking effect and impairing the elasticity of the nonwoven fabric.

On the other hand, as such a low melting point polymer, a poly-1-nophine polymer is preferred.

9- The number of crimps of the fibers of the nonwoven fabric obtained in this way is 10 to 50, and the degree of crimping is 25 to GO=4, and more preferably the number of crimps is 30. ~45 ke, i'
/-+, crimp degree is 30 to 40%. If the number of crimp and the degree of crimp are too low, the elongation of the nonwoven fabric will be small and a high degree of elastic recovery and stretchability will not be obtained. On the other hand, if the number of crimps and the degree of crimping are too large, the resistance to elongation of the nonwoven fabric will be too large, making it unsuitable for use as filling for sports clothing.
It also has a hard texture.

In order to bring out these latent crimp, it is preferable to simultaneously develop the crimp and fuse and fix the low melting point component by, for example, blending the cotton with a low melting point polymer fiber and then heat treating it.

In that case, in order to develop elasticity, the area shrinkage rate should be 40 to 80%, more preferably 50 to 80%, by heat treatment.
Do this so that it is 70%. When the area shrinkage rate is less than 40 inches, the elongation of the nonwoven fabric is small and a highly elastic nonwoven fabric cannot be obtained.
10- On the other hand, if the volumetric shrinkage ratio exceeds 80, the resistance to elongation of the fabric will increase and the texture will also become harder. .

The isomerism of the nonwoven fabric obtained in the above manner is 18 to 32i7
．． The range is preferably 9, more preferably 20 to 25 tpl.
/g. If this bulk is too low, the hardness of the resulting nonwoven fabric will increase too much. On the other hand, if the bulk is too high, the density of the fibers will be too low, resulting in poor compression properties and, when used as batting, will tend to change shape and have poor dimensional stability.

The nonwoven fabric obtained by the present invention has better drapeability and stretchability than conventional fabrics, has a soft texture, has good washing resistance, and has good heat retention properties, which cannot be obtained with conventional batting. Since it has properties that were not previously available, it is particularly suitable as a filling material for sports clothing.

Next, examples of the present invention will be described in detail, but the present invention is not limited thereto.

The measurement method used here is as follows.

¥41 reduction number, winding degree; JIS l-10746-11
-1 to 2 synthetic fiber f [according to stable test method θ's number of crimps, crimp rate, and residual crimp rate measurement method.

Melting point: Differential thermal analyzer, manufactured by Rigaku Denki (10), type DAT N.

g67sD-1.

Fineness: Based on denier measurement method, 6-5-A or B method of JIS r-1074 synthetic f&fiber stable test method.

Drapability: Based on JIS 1079-66 bending resistance measurement method (45° cantilever method).

Example 1 A bicomponent yarn consisting of 190 filaments was obtained by spinning Nisdel units derived from dicarboxylic acid using a shell-type spinneret at 280°C.

When the winding speed is +1oom/min, the discharge amount is 0.0mm per component.
5. ! 7/min/hole.

This was stretched at a draw ratio of 3.2 times at a hot water temperature of 70°C, and then further passed through a hot water bath at a hot water temperature of 90''C to be mechanically crimped using a talinper.

After that, it was cut into a length of 60 Mw. Its fineness is 3
Denier: The number of mechanically crimped threads was 4 ke/fu.

The physical properties of the fiber thus obtained were as shown in Table 2.

13- Table I Physical Properties of Eccentric Composite Fiber Cheetah CN; Number of crimp (7725 companies) Bitter CD; Apparent degree of crimp (%) Saki CR; Residual crimp degree (correspondence) ■Yellow Bitter-X -CE; Crimp elasticity (φ) (2) Web preparation The eccentric composite fiber obtained by the method (1) and the thermoplastic 2 denier, cut length: 51 mm) were mixed in a weight ratio of 85:15. The cotton was mixed using an opener at the same ratio. The cotton was passed through a card (manufactured by Keiwa Kikai Seisakusho) 14- to create a web of ``N&/RD''.

(3) Two-Dollar Punch To improve the interlacing points between the fibers, use a Feller needle punch machine to make the web with #'36 barbs.
Knee ring was performed under the conditions of regular, double-sided punch density of 30 P/d, and insertion depth of 9.

(4) Heat treatment The web created in processing steps i2) and +3) was sent to a dry heat treatment chamber and heat treated at a temperature of 180° C. for a treatment time of 2 minutes. This heat treatment results in area shrinkage, 6
It was 5%.

The bulk of the nonwoven fabric created in this way (L is 25u!) /
,! 7. The recovery elastic force was 36 g.

15-

Claims (1)

[Claims] Consisting of two components: 5-sulfoisophthalic acid copolymerized polyester (A) and polybutylene ethylene phthalate (B),
The entanglement point of the web made of eccentric core sheath-type composite fibers having a composite ratio of 70/30 to 30/70 and a melting point difference of 20 to 40°C is point-bonded with a low melting point polymer (C). It is a nonwoven fabric made of corrugated fibers, and (1) the fineness of the composite fiber is 1 to 10 denier, the number of crimp is 10 to 50 cm/inch, and the degree of crimp is 25 to 50 cm, (2) a low melting point polymer (C ) has a melting point 40 to 90°C lower than the low melting point component of the composite fiber, and the plum content is 3 to 30% by weight relative to the weight of the nonwoven fabric. ~80%, and the high impact example 7 non-#jj'j fabric is characterized by having a throwing elasticity of 10 to 50 g.