JP2003049326A - Fusing polyester staple fiber and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide fusing polyester staple fibers which have an excellent opening property and can homogeneously be blended to give a fiber structure having stable performances, when opened and blended with air or the like to form a blended fiber mass which is further thermally treated to produce the fiber structure, to provide a method for producing the fusing polyester staple fibers, and to provide the fiber structure using the staple fibers. SOLUTION: The fusing polyester staple conjugate fibers are obtained by subjecting a polyester (A) having a melting point of <=200 deg.C and a polyester (B) having a higher melting point than the melting point of the polyester (A) to a bicomponent spinning process, wherein the surface of each obtained conjugate fiber partially comprises the low melting point polyester (A), and have crimps, an electrical resistivity of <=1.0×10<9> Ω, and a fiber length of 5 to 15 mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-fusible polyester short fiber, and more specifically, when opening and mixing cotton by means such as air blowing, it is easier to open the cotton than conventional cotton. It has excellent fineness and can be uniformly blended, and as a result, as a highly processed fiber product using the heat-fusible polyester short fibers, the fiber lump mixed with other fibers is subjected to heat treatment, The present invention relates to a heat-adhesive polyester staple fiber that enables a fiber structure having stable performance to be obtained when a structure is manufactured, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Heat-bonding property called hot-melt type binder fiber for the purpose of adhering fibers (main fibers) mainly constituting pillows, bedding materials paddings, quilting paddings, mattress paddings, etc. Short fibers are used.

The binder fiber is appropriately mixed with the main fiber, and is heated while maintaining a predetermined three-dimensional shape to exert a heat-adhesive function to form a fiber lump having a predetermined shape. The predetermined shape is usually a three-dimensional three-dimensional structure, and there are simple shapes such as a rectangular parallelepiped and a cube, but also those having a complicated three-dimensional shape according to the place where it is finally used. is there.

On the other hand, in recent years, in vehicle interior materials such as automobile floor silencers and dash silencers, or soundproofing materials for various purposes, while maintaining shape retention and other necessary physical properties, the bulk density is lower. It is desirable to use a lightweight one from the viewpoint of ease of handling and workability, and it has been considered to use a fiber lump (fiber structure) formed in the above-described predetermined shape.

In the manufacturing process of these fiber lumps, after the main fiber and the binder short fiber are simply opened, the cotton is supplied at the same time as the cotton is supplied by air-blowing, etc., and further heat-treated under a predetermined shape. Then, a method for forming a fiber structure product is used.

However, when a fiber structure product is manufactured by such a method, problems such as insufficient rigidity and poor shape of the fiber structure product due to the fact that the fibers are not uniformly mixed and the heat-sealing fibers are not opened well, and the wind There was a problem such as a decrease in productivity due to cotton clogging in the feeding line.

[0007]

The object of the present invention is to solve the above-mentioned problems, to open and mix cotton by air blowing, etc. to obtain a mixed fiber mass, and further heat-treat the fiber structure. A heat-adhesive polyester staple fiber capable of obtaining a fibrous structure having excellent openability and being uniformly mixed to produce a fiber structure having stable performance when producing a product, a method for producing the same, and the staple fiber It is to provide a fibrous structure.

[0008]

The present inventors have achieved the present invention as a result of extensive studies to solve the above problems.

That is, the heat-fusible polyester short fibers according to the present invention have the following constitutions (1) to (2). (1) Polyester (A) having a melting point of 200 ° C. or lower
And a polyester (B) having a melting point higher than that of (A)
And at least a part of the surface of the composite fiber obtained by the composite spinning is a heat-fusible fiber composed of the low melting point polyester (A), and the fiber has a crimp, and the electrical resistivity of the fiber is Is 1.0 × 10 ⁹ Ω or less, and the fiber length of the fiber is 5 mm or more and 15 mm or less. (2) The heat-fusible polyester composite short fiber according to the above (1), wherein crimping is imparted to at least 5 threads / 25 mm or more.

Further, the fiber structure according to the present invention has the following constitution (3). (3) A fibrous structure containing 10 to 90% by weight of the heat-fusible polyester composite short fiber according to the above (1) or (2).

The method for producing heat-fusible polyester short fibers according to the present invention has the following constitution (4). (4) Polyester (A) having a melting point of 200 ° C. or lower
And a polyester having a melting point higher than the melting point of (A) are composite-spun to form a polyester composite continuous fiber in which at least a part of the surface of the composite fiber is the low-melting polyester (A), and an oil agent or treatment Applying oil content and crimping using an agent, the fiber length is 5 mm or more and 15 mm
A method for producing a heat-fusible polyester composite short fiber, which comprises the following short cuts.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.

As a result of earnest studies to achieve the above-mentioned object, the inventors of the present invention have found that the heat-fusible fibers generate static electricity, which deteriorates the openability of the fibers and makes the mixed cotton uneven. We have obtained the knowledge that cotton jams and the like occur in the delivery line.

From this point of view, the fiber according to the present invention is a composite fiber obtained by composite spinning a polyester (A) having a melting point of 200 ° C. or less and a polyester having a melting point higher than the melting point of the (A). At least a part of the surface is a heat-fusible fiber made of the low melting point polyester (B), and the electric resistivity of the fiber is 1.0 × 10 ⁹ Ω or less, and the fiber length of the fiber is 5 mm or more. It is a heat-fusible polyester composite short fiber having a length of 15 mm or less.

In the present invention, the heat-fusible fiber may be a fiber lump formed by being mixed with other fibers (main fiber, matrix fiber), and the fiber lump is bonded by heat treatment. It refers to a fiber that functions as an agent and can bond the other fibers to produce a fibrous structure in a solid state as a whole.

In the present invention, at least a part of the surface of the composite fiber obtained by composite spinning of the polyester (A) having a melting point of 200 ° C. or less and the polyester (B) having a melting point higher than the melting point is the above-mentioned low. It is important that the composite fiber is composed of the melting point polyester (A).

The polyester (A) is not particularly limited, but terephthalic acid or its ester-forming derivative, isophthalic acid or its ester-forming derivative, lower alkylene glycol, and polyalkylene glycol and / or its Preference is given to using copolyesters which consist of monoethers.
As the polyester (B), those having a melting point of 200 ° C. or higher are usually used, and specifically, polyethylene terephthalate and polybutylene terephthalate are preferably used, but polyethylene terephthalate is most preferable from the viewpoint of strength characteristics.

The polyester conjugate fiber according to the present invention may be such that at least a part of the fiber surface is formed of polyester (A), and the form thereof is a composite type such as a laminating type, a core-sheath type or a sea-island type. And a part or all of the portion occupying the fiber surface of the composite fiber is polyester (A)
It may be formed of. In particular, the core-sheath type is preferable from the viewpoint of yarn formability and product performance.

The composite ratio of polyester (A) is 20 to
It is desirable to set it to 80% by weight. When the polyester (A) is less than 20% by weight, it is difficult to obtain sufficient adhesiveness. On the other hand, when it is more than 80% by weight, the spinnability is generally deteriorated and the fiber strength is also deteriorated. It is not preferable because it comes.

The heat-fusible polyester composite short fiber according to the present invention can be produced by compounding polyester (A) and polyester (B), melt-spinning, stretching and cutting into a predetermined length. .

In the case of the heat-fusible fiber of the present invention, although not particularly limited, single fiber denier 1 to 10 dtex
Something is preferable. 1 to 5 dtex in terms of uniform dispersibility and adhesiveness when mixed with main component fibers (main component fibers)
Is more preferable.

The fiber preferably has crimp,
The crimping method is not particularly limited, but so-called two-dimensional crimp fibers are preferable. The number of crimps applied is preferably in the range of 5 ridges / 25 mm or more and 15 ridges / 25 mm or less, and more preferably 7 ridges / 25 mm or more and 10 ridges / when considering the openability of the fiber during air blowing.
25 mm or less is preferable.

When the crimping is not applied, the fibers are scattered in the manufacturing process of the fiber and the manufacturing process of the fiber structure, which is not preferable. Further, by crimping the fibers, the entanglement with other fibers (main component fibers) to be mixed and treated is improved, so that it is possible to obtain a structure having good rigidity and bulkiness. .

It is important that the heat-fusible fiber according to the present invention has a fiber length of 5 mm or more and 15 mm or less, and preferably 8 mm or more and 12 mm or more from the viewpoint of openability and mixing and entanglement with the main component fiber. The following are good things:

If the fiber length is less than 5 mm, the entanglement with the main component fibers (main component fibers) becomes poor, or the fibers are scattered,
This is not preferable because it causes deterioration of the working environment. Also 15 mm
If the length of the fiber is longer than that, the openability of the heat-fusible short fiber is poor, and the characteristics such as the rigidity of the product are impaired, or the shape is defective, which is not preferable.

The heat fusible fiber of the present invention has an electric resistivity of
1.0 x 10⁹Ω or less is essential and preferable
Ku 5.0 × 10⁸Ω or less, and also in terms of operability
To more preferably 1.0 × 10⁸Ω or less is preferable. The fiber
The electrical resistivity of the fiber is 1.0 × 10⁹ If it is larger than Ω
Static electricity is generated due to friction between fibers, and
Products that cause cotton clogging or defective fiber opening
Cause to impair the characteristics of.

The means for reducing the electrical resistivity of the fiber to 1.0 × 10 ⁹ Ω or less is not particularly limited,
Examples thereof include a method of adjusting the fiber surface with an appropriate oil agent or a treating agent, and a method of kneading an antistatic agent or the like into the fiber raw material. To adjust the electrical resistivity of the fiber by applying an oil agent, an oil component such as an ionic surfactant (anionic surfactant, cationic surfactant) is used as the oil agent active ingredient in an amount of 0.12 to 0.30 relative to the weight of the fiber. %, A method of applying so as to adhere. The oil content can be applied during spinning or at an appropriate time after spinning.

[0028]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. (1) Fineness: The fineness (dtex) is measured by the method specified in JIS L-1015. (2) Fiber length: Shown in fiber length (mm) by the method specified in JIS L-1015. (3) Crimp number: The heat fusion fiber before cutting is JIS L-
It is shown by the number of crimps (peak / 25 mm) measured by the method shown in 1015. (4) Electrical resistivity: Cut heat-fusible fiber sample 1
0g in standard condition (temperature 20 ± 2 ℃, relative humidity 65 ± 2
%), Left for 4 hours or more, SM-5 manufactured by Toa Denpa Co., Ltd.
Type ultra-insulator, using a sample cylinder (made of acrylic: inner diameter 80 m
The fiber was put in m), and the electrical resistivity was measured 2 minutes after the heavy-duty electrode (made of stainless steel) was placed. (5) Opening property: The degree of opening of the short fibers that have passed through the simple opening machine (simple opening machine (model 0250) manufactured by Daiwa Kiko Co., Ltd.) is visually compared with the opened state before passing through the opening machine. Then it was judged. (6) Shape: Regarding the shape of the heat-treated fiber structure,
The surface uniformity was visually determined. (7) Bending flexibility: JIS 1085-1998 ・ 6-10
It is represented by the bending resistance (Br) measured by the method shown in FIG. (8) Melting point: The melting point (° C) measured by the method specified in JIS L-1015. Example 1 Intrinsic viscosity [η] obtained by transesterifying 60 mol% of dimethyl terephthalate, 40 mol% of isophthalic acid as an acidic component, 88 mol% of ethylene glycol and 12 mol% of diethylene glycol as a glycol component, and then performing a polycondensation reaction. 0.64 is a copolymerized polyester (A component, melting point 110 ° C.) and polyethylene terephthalate having an intrinsic viscosity [η] of 0.64 and a melting point of 260 ° C., and the core component is polyethylene terephthalate (B). Component, melting point 260 ° C.),
A core-sheath composite unstretched yarn having a sheath component made of copolymerized polyester was obtained.

Next, the undrawn yarn is drawn 3 times in warm water to obtain a drawn yarn of 2.2 dtex, and the oil agent (anionic surfactant) is used as the oil agent active ingredient in an amount of 0.18 wt% of the fiber weight.
% After crimping (crimping number:
8 ridges / 25 mm) and then cut to a fiber length of 10 mm.

The electrical resistivity of the resulting heat fusible fiber is shown in Table 1.

30% by weight of the obtained heat-fusible fiber, a fiber length of 51 mm opened by a fiber-opening machine, and a fineness of 14.4 dt
70% by weight of polyethylene phthalate fiber ex was blown, mixed with cotton, and then heat-treated at 140 ° C. for 15 minutes to obtain solid cotton. The evaluation results of the obtained cotton wool are shown in Table 1. The openability of the cotton was also good, and the shape and surface quality of the obtained cotton was good. In addition, it was possible to obtain a product having excellent rigidity as cotton. Example 2 A core-sheath composite unstretched yarn obtained by using the same polymer as in Example 1 was stretched 3 times to obtain a 2.2 dtex stretched yarn,
An oil agent (anionic surfactant) was applied so that the active ingredient of the oil agent was attached at 0.18 wt% with respect to the fiber weight, and then crimp treatment (crimp number: 8 threads / 25 mm) was performed, and then the fiber length was cut to 6 mm.

The electrical resistivity of the resulting heat-fusible fiber is shown in Table 1.

The obtained heat-fusible fiber was obtained in the same manner as in Example 1 to obtain cotton wool.

Table 1 shows the evaluation results of the obtained cotton wool. Similar to Example 1, the openability of the cotton was good, the shape of the obtained cotton was good, and the rigidity of the cotton was excellent. Example 3 A core-sheath composite unstretched yarn obtained by using the same polymer as in Example 1 was stretched 3 times to obtain a 2.2 dtex stretched yarn,
An oil agent (anionic surfactant) was applied so that the active ingredient of the oil agent was attached at 0.17 wt% based on the weight of the fiber, and then crimped (crimp number: 8 threads / 25 mm), and then cut into a fiber length of 6 mm.

The electrical resistivity of the resulting heat fusible fiber is shown in Table 1.

The heat-fusible fiber thus obtained was obtained in the same manner as in Example 1 to obtain cotton wool.

The evaluation results of the obtained cotton wool are shown in Table 1. The openability of the cotton was good, the shape of the obtained cotton was also good, and the rigidity of the cotton was excellent. Example 4 A core-sheath composite undrawn yarn obtained by using the same polymer as in Example 1 was drawn 3 times to obtain a drawn yarn of 4.4 dtex,
An oil agent (anionic surfactant) was applied so that the active ingredient of the oil agent was attached at 0.18 wt% based on the weight of the fiber, and then crimp treatment (crimp number: 8 threads / 25 mm) was performed, and then the fiber was cut into 10 mm.

The electrical resistivity of the resulting heat fusible fiber is shown in Table 1.

The obtained heat-fusible fiber was obtained in the same manner as in Example 1 to obtain cotton.

Table 1 shows the evaluation results of the obtained cotton wool. The openability of the cotton was good, the shape of the obtained cotton was good, and the rigidity of the cotton was excellent. Example 5 A core-sheath composite unstretched yarn obtained by using the same polymer as in Example 1 was stretched 3 times to obtain a 2.2 dtex stretched yarn,
An oil agent (anionic surfactant) was applied so that the active ingredient of the oil agent was attached at 0.18 wt% with respect to the fiber weight, and then crimp treatment (crimp number: 3 crests / 25 mm) was performed, and then the fiber length was cut to 10 mm.

The electrical resistivity of the resulting heat-fusible fiber is shown in Table 1.

The resulting heat-fusible fiber was obtained in the same manner as in Example 1 to obtain cotton.

Table 1 shows the evaluation results of the obtained cotton wool. Since the crimp number of the cotton after the opening machine is slightly low,
Although the opening of the cotton was slightly large, it was not a level that caused clogging in the air duct due to this and was not a problem in production. Further, the surface quality of the obtained cotton wool was good, and it had the required characteristics in terms of rigidity, and an excellent one could be obtained. Comparative Example 1 A core-sheath composite unstretched yarn obtained by using the same polymer as in Example 1 was stretched 3 times to obtain a 2.2 dtex stretched yarn,
After the oil agent (anionic surfactant) was applied so that the active ingredient of the oil agent was attached at 0.09 wt% with respect to the fiber weight, crimp treatment (crimp number: 8 threads / 25 mm) was performed, and then the fiber length was cut to 10 mm.

The electrical resistivity of the resulting heat fusible fiber is shown in Table 1.

The obtained heat-fusible fiber was obtained in the same manner as in Example 1 to obtain cotton wool.

Table 1 shows the evaluation results of the obtained cotton wool. When the electricity was generated, the cotton was rolled into a ball shape and the spreadability was poor. Further, the obtained cotton wool also has irregularities on the surface and is defective, and further, there is a large variation in adhesive strength and measurement, and there is a large variation in adhesive strength depending on the location of the cotton wool. Moreover, the required characteristics were not obtained in terms of rigidity. Comparative Example 2 A core-sheath composite unstretched yarn obtained by using the same polymer as in Example 1 was stretched 3 times to obtain a 2.2 dtex stretched yarn,
An oil agent (anionic surfactant) was applied so that the active ingredient of the oil agent was attached by 0.09 wt% relative to the weight of the fiber, and then crimp treatment (crimp number: 3 crests / 25 mm) was performed, and then the fiber length was cut to 10 mm.

The electrical resistivity of the resulting heat fusible fiber is shown in Table 1.

The resulting heat-fusible fiber was obtained in the same manner as in Example 1 to obtain cotton.

Table 1 shows the evaluation results of the obtained cotton wool. When the electricity was generated, the cotton was rolled into a ball shape and the spreadability was poor. Also, some of the cotton was too open and scattered around the opening machine. The obtained cotton wool also had irregularities on the surface and was defective, and required properties could not be obtained in terms of rigidity. Comparative Example 3 A core-sheath composite unstretched yarn obtained by using the same polymer as in Example 1 was stretched 3 times to obtain a 2.2 dtex stretched yarn,
After the oil agent (anionic surfactant) was applied so that the active ingredient of the oil agent adhered to the fiber weight in an amount of 0.10 wt%, crimp treatment (crimp number: 8 threads / 25 mm) was performed, and then the fiber length was cut to 38 mm.

The electrical resistivity of the resulting heat-fusible fiber is shown in Table 1.

The obtained heat-fusible fiber was obtained in the same manner as in Example 1 to obtain cotton.

Table 1 shows the evaluation results of the obtained cotton wool. The opening of the cotton with the opening machine was poor, and the obtained solid cotton was also defective because the surface had irregularities. The required characteristics were not obtained in terms of rigidity. Comparative Example 4 A core-sheath composite unstretched yarn obtained by using the same polymer as in Example 1 was stretched 3 times to obtain a 2.2 dtex stretched yarn,
An oil agent (anionic surfactant) was applied so that the active ingredient of the oil agent was attached at 0.18 wt% with respect to the fiber weight, and then crimp treatment (crimp number: 3 peaks / 25 mm) was performed, and then the fiber length was cut to 38 mm.

The electrical resistivity of the resulting heat fusible fiber is shown in Table 1.

The heat-fusible fiber thus obtained was obtained in the same manner as in Example 1 to obtain cotton wool.

Table 1 shows the evaluation results of the obtained cotton wool. The opening of the cotton discharged from the opening machine was poor, and the obtained solid cotton was also defective because the surface had irregularities. The required characteristics were not obtained in terms of rigidity. Comparative Examples 5 and 6 A core-sheath composite unstretched yarn obtained by using the same polymer as in Example 1 was stretched 3 times to obtain a 2.2 dtex stretched yarn,
After applying the oil agent (anionic surfactant) so that the active ingredient of the oil agent adheres to 0.09 wt% relative to the fiber weight, crimp treatment ((crimp number: 8 peaks / 25 mm (Comparative Example 6), 3
Mountain / 25 mm (Comparative Example 7)), and then fiber length 38
Cut into mm.

The electrical resistivity of the resulting heat-fusible fiber is shown in Table 1.

The resulting heat-fusible fiber was obtained in the same manner as in Example 1 to obtain cotton wool.

Table 1 shows the evaluation results of the obtained cotton wool. The obtained cotton wool was also defective because the surface had irregularities. The required characteristics were not obtained in terms of rigidity.

[0059]

[Table 1]

[0060]

EFFECTS OF THE INVENTION According to the heat-adhesive polyester short fibers of the present invention, it is possible to obtain a fibrous structure having excellent openability and being uniformly mixed and having stable performance.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4L041 AA19 AA20 BA02 BA05 BA21                       BA49 BA59 BC07 BD04 BD11                       CA06 CA12 DD05                 4L047 AA21 AA27 AB02 AB09 AB10                       BA09 BB06 BB09 CB10 CC07                       CC16

Claims (4)

[Claims] 1. A composite fiber obtained by composite spinning of a polyester (A) having a melting point of 200 ° C. or lower and a polyester (B) having a melting point higher than the melting point of the (A), at least a part of the surface of the composite fiber. A heat-fusible fiber composed of the low melting point polyester (A), the fiber having a crimp, an electric resistivity of 1.0 × 10 ⁹ Ω or less, and a fiber length of the fiber. A heat-fusible polyester composite short fiber having a length of 5 mm or more and 15 mm or less. 2. The heat-fusible polyester composite staple fiber according to claim 1, wherein crimps are provided at 5 peaks / 25 mm or more. 3. A fiber structure containing 10 to 90% by weight of the heat-fusible polyester composite short fibers according to claim 1 or 2. 4. A polyester (A) having a melting point of 200 ° C. or lower and a polyester having a melting point higher than the melting point of the (A) are subjected to composite spinning, and at least a part of the surface of the composite fiber has the low melting point polyester ( A polyester composite long fiber consisting of A) is spun, and further an oil component or a crimp is applied by using an oil agent or a treating agent, and the fiber length is 5 mm or more 15
A method for producing a heat-fusible polyester composite short fiber, which is characterized in that it is cut to a length of less than mm.