JP5915165B2 - Fiber structure - Google Patents

Description

The present invention relates to fibrous structures comprising had use a polyester-based heat-bonding multiple synthetic Wei.

  Conventionally, polyester fibers have been widely used as bedding for comforters and mattresses, down jackets, cotton padded shruffs, and the like. The polyester fiber is excellent in bulkiness, and has good processability when processed into a product such as a yarn-forming property at the time of fiber production and a nonwoven fabric. However, there has been a problem that the bulkiness decreases as the product is used for a long time.

  In order to solve this problem, resin cotton or solid cotton with polyester fiber bonded with resin or low melting point polymer has been proposed. However, in this proposal, the adhesive strength is weak and the durability of the bonded part is low. During use, the adhesive point was destroyed and the shape changed greatly, the repelling property was greatly reduced, and since the adhesive was hardly molded, only those with poor cushioning were obtained. On the other hand, a fiber made of a highly elastic polymer such as a polyester-based elastomer was proposed. In this proposal, although it is excellent in elastic recovery, it has a defective process in the yarn making process and product processing process due to friction and shrinkage characteristics. There was a problem.

  In order to solve the above-mentioned problems, a composite fiber composed of a polyester excellent in yarn-making property, workability and bulkiness, and a polyester-based elastomer having elasticity and excellent recoverability has been proposed.

  For example, a core-sheath composite raw cotton having a polyester-based elastomer as a sheath component and polyester as a core component has been proposed (see Patent Documents 1 and 2). When manufacturing a fiber assembly using the composite fiber, these are heat-treated at a temperature higher than the melting point of the polyester-based elastomer of the sheath component and heat-bonded between the fibers so that the bonded portion is not easily broken during deformation. The shape stability is excellent, but the recoverability and heat retention after compression are not sufficient.

  Further, a side-by-side composite fiber of polyester elastomer and polyester has been proposed (see Patent Document 3). Similarly to the proposals in Patent Documents 1 and 2, when producing a fiber assembly using the composite fiber, heat treatment is performed at a temperature higher than the melting point of the one-component polyester elastomer on one side to heat the fibers. By fusing, the bonded portion is hardly broken at the time of deformation and is excellent in form stability, but the recovery property and heat retention after compression are not sufficient.

  There has been proposed a composite fiber in which a plurality of polyester elastomers and polyesters are alternately joined around a hollow portion in a ring shape (see Patent Document 4). However, in this composite fiber, since the polyester elastomer and the polyester are divided into a plurality of parts, it is difficult to obtain the characteristics of the polyester elastomer and the polyester, and the number of joint points between the polyester elastomer and the polyester is increased. For this reason, there is a problem that the yarn forming property is difficult.

Japanese Patent No. 2595739 JP-A-8-209552 Japanese Patent No. 3588635 JP-A-11-269722

Accordingly, an object of the present invention is to solve the above-described problems in the prior art by increasing the number of components when forming a fiber structure by forming a hollow portion in a composite fiber, and further increasing the number of thermal bonding points. sex, post-compression recovery, and to provide a fiber structure formed by have use a polyester-based heat-bonding multiple synthetic Wei contribute to thermal insulation.

The present invention is intended to achieve cents above objects, textiles structure of the present invention, a melting point of 90 ° C. or higher 200 ° C. or less of the polyester-based elastomer (A), a melting point of 220 ° C. or more polyesters ( B), and the ratio of the polyester elastomer (A) to the polyester (B) is in the range of (A) / (B) = 60/40 to 10/90 by mass ratio. , said polyester elastomer (a) and the polyester (B), but arranged in a side-by-side type, the composite fibers of have a hollow portion hollow ratio of 5-50% in the fiber interior contour in the fiber cross-section Lupo Riesuteru based thermal adhesive composite fibers, a fiber structure comprising a plurality of polyester staple fibers and cotton mixing.

  According to a preferred aspect of the fiber structure of the present invention, the polyester-based heat-bonding conjugate fibers are entangled with each other, and the intersection is thermally bonded by the polyester-based elastomer (A), and / or the polyester-based heat. The adhesive composite fiber and other polyester short fibers are entangled, and the intersection is thermally bonded by the polyester elastomer (A).

  According to a preferred embodiment of the fiber structure of the present invention, the ratio of the polyester-based short fibers and the polyester-based heat-bonding composite fibers is a mass ratio, and the polyester-based short fibers / polyester-based heat-bonding composite fibers = 99. / 1 to 70/30.

According to the present invention, it is possible to obtain a good bulkiness, formed by using a polyester-based heat-bonding multiple synthetic Wei contribute to the post-compression recovery and insulation fiber structure.

FIG. 1 is a perspective view for explaining a method for measuring bulkiness characteristics of a fiber structure according to the present invention. FIG. 2 is a perspective view for explaining a method for measuring the bulkiness characteristics of the fiber structure of the present invention. FIG. 3 is a perspective view for explaining a method for measuring the bulkiness characteristics of the fiber structure of the present invention. FIG. 4 is a perspective view for explaining a method for measuring the bulk property of the fiber structure of the present invention. FIG. 5 is a perspective view for explaining a method for measuring the bulkiness characteristics of the fiber structure of the present invention. FIG. 6 is a perspective view for explaining a method for measuring the bulkiness characteristics of the fiber structure of the present invention.

The polyester-based heat-bonding conjugate fiber used in the present invention is a conjugate fiber comprising a polyester-based elastomer (A) having a melting point of 90 ° C. or higher and 200 ° C. or lower and a polyester (B) having a melting point of 220 ° C. or higher. The conjugate fiber is a polyester-based thermobonding conjugate fiber characterized by having a hollow portion inside the fiber cross section.

  The polyester elastomer (A) used in the present invention may be a block copolymer having crystalline polyester as a hard segment and poly (alkylene oxide) glycol or amorphous polyester as a soft segment. Hard segments include polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate, and soft segments include polyethylene ethylene glycol, polypropylene glycol, polytetramethylene glycol, and polyhexamethylene. The hard segment is preferably polybutylene terephthalate, and the soft segment is preferably polytetramethylene glycol.

  Moreover, the polyester (B) used by this invention should just have fiber formation ability. Examples of the polyester (B) include polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate, with polyethylene terephthalate being preferred.

  Since polyethylene terephthalate has a good interfacial affinity with a polyester elastomer, the adhesion between the polyester elastomer and the polyester is good.

  The optimum intrinsic viscosity (IV: measured at a temperature of 25 ° C. using an orthochlorophenol solvent) of the polyester (B) is 0.60 to 0.75, more preferably 0.64 to 0.72. is there.

  When the melting point of the polyester-based elastomer (A) is too low, the heat resistance is lowered, and when it is too high, it becomes difficult to thermally bond at the production of the fiber structure, and is 90 ° C. or higher and 200 ° C. or lower, preferably 120 ° C. or higher and 185 ° C. The range below ℃ is appropriate.

  Moreover, since it is necessary for the melting point of polyester (B) not to melt when thermally bonding at the time of manufacturing the fiber structure, it is suitably 220 ° C. or higher and 280 ° C. or lower.

  The melting point was measured using a Diamond DSC manufactured by PerkinElmer Co., Ltd., measured at a heating rate of 20 ° C., and determined from the melting peak temperature.

  The polyester-based elastomer (A) and polyester (B) used in the present invention include, if necessary, titanium dioxide as a matting agent, silica and alumina fine particles as a lubricant, and hindered phenol derivatives as an antioxidant. Coloring pigments, stabilizers, fluorescent agents, antibacterial agents, deodorants, reinforcing agents, flame retardants, and the like may be added.

Polyester thermal bonding conjugate fiber used in the present invention, the polyester-based elastomer (A) and the polyester (B), but placed in a side-by-side, and a composite fiber form having a hollow fiber cross-section inside.

  In the present invention, the hollow part of the hollow part means having a hollow part inside the outer shape of the fiber in the fiber cross section. The cavity may be located at the center of the fiber or may be decentered from the center, but is preferably located at the center of the fiber. Furthermore, the cross-sectional shape of the cavity may be any shape such as a round shape or a polygonal shape.

Polyester thermal bonding composite fibers used in the present invention, in the fiber cross-section, Ri hollow rate of the hollow portion 5-50% der, more preferably 15 to 45%. When the hollowness is less than 5%, the contribution to bulkiness and recoverability after compression is small, and when the hollowness exceeds 50%, spinning becomes difficult. The hollow ratio can be expressed in% by calculating the ratio of the area of the hollow part to the total area of the fiber cross section including the hollow part from the enlarged photograph of the fiber cross section.

In the polyester-based heat-bonding conjugate fiber used in the present invention , the ratio of the polyester-based elastomer (A) to the polyester (B) is in the range of (A) / (B) = 60/40 to 10/90 in mass ratio. Ri, more preferably in the range of a mass ratio (a) / (B) = 50 / 50~20 / 80.

  When the proportion of the polyester elastomer (A) is less than 10% by mass, the thermal adhesiveness and the recoverability after compression are inferior, and when it exceeds 60% by mass, the bulkiness is lowered, and there is a problem of friction and shrinkage characteristics. Therefore, it becomes difficult to produce the yarn.

  The single fiber fineness of the polyester-based heat-bonding conjugate fiber of the present invention is preferably in the range of 0.7 to 15.0 dtex, more preferably 1.5 to 5.0 dtex.

  The fiber length of the polyester-based heat-bonding conjugate fiber of the present invention is preferably 10 to 80 mm, more preferably 30 to 70 mm, from the viewpoints of entanglement with other fibers and card processability.

  According to the present invention, a fiber structure is provided using the above-described polyester-based heat-bonding conjugate fiber of the present invention. That is, according to the present invention, there is provided a fiber structure in which the polyester heat-bonding conjugate fiber of the present invention is mixed in a fiber structure composed of a plurality of polyester-based short fibers.

  As a method of mixing the polyester-based heat-bonding conjugate fiber of the present invention with other polyester-based short fibers, for example, after laminating each short fiber and passing it through a fiber-opening machine, it is sent by wind and / or card machine. A mixing method can be adopted. Alternatively, a method may be employed in which the tows before being made into short fibers are overlapped and mixed by cutting at the same time, then passed through a fiber opening machine, and mixed by airing and / or carding.

  The mixed raw cotton for a fiber structure thus obtained has a temperature not lower than the melting point of the polyester elastomer (A) portion and not higher than the melting point of the polyester (B) portion of the polyester-based heat-bonding conjugate fiber obtained in the present invention. The intersection where the heat-treated polyester-based heat-bonded conjugate fibers are entangled with each other is thermally bonded by the polyester-based elastomer (A), and / or the intersection where the polyester-based heat-bonded conjugate fibers and other polyester-based short fibers are entangled is polyester. The fiber structure is manufactured by heat bonding with the system elastomer (A). This heat treatment can be performed at any stage.

  The polyester elastomer (A) plays a role as an adhesive at the thermal bonding point, and since the polyester elastomer (A) has rubber elasticity, it exhibits rubber elasticity at the contact and contributes to recoverability after compression. To do.

  In addition, at the intersection where the heat bonding is performed, most of the polyester elastomer (A) in the polyester heat bonding composite fiber is melted by heat, and only the polyester (B) remains, and the alphabet C appears to be continuous. There is a part which is in a state, and that part contributes to bulkiness and contributes to recoverability after compression.

  Furthermore, since each fiber is thermally bonded at the fiber intersection, there is little decrease in recovery after compression when the obtained fiber structure is used for a long time.

  When the polyester-based heat-bonded conjugate fiber of the present invention is compressed, the polyester-based elastomer (A) portion itself returns to its original shape when released from compression, even when it is compressed. Therefore, the fiber structure is excellent in recoverability after compression.

  In the fiber structure of the present invention, the ratio of the other polyester-based short fibers and the polyester-based heat-bonded conjugate fiber of the present invention is, by mass ratio, polyester-based short fibers / the polyester-based heat-bonded conjugate fiber = 99/1. It is preferable to be in the range of ~ 70/30. In the fiber structure of the present invention, it is essential that the composite fiber of the present invention is contained, and if it is too much, the initial bulk height may be lowered. A more preferable range is a range of polyester short fiber / polyester heat-bonded conjugate fiber of the present invention = 97/3 to 80/20 by mass ratio.

  Moreover, the fiber structure should just contain the polyester-type heat bonding composite fiber of this invention, Furthermore, the other polyester type short fiber to mix may be one or more types, Preferably it is 1-4 types. It is.

  Examples of the polyester constituting the other polyester-based short fibers include polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate, and preferably polyethylene terephthalate or polybutylene terephthalate. Moreover, the single fiber fineness of the other polyester short fibers is preferably 0.5 to 20 dtex, more preferably 0.7 to 10 dtex.

  The form of the fiber structure of the present invention may be any shape such as a circle, a square, and a triangle, and may be placed in a side or the like. The fiber structure of the present invention is suitably used for applications such as down jackets, shuffling, bedding, and cushions.

  Next, the polyester thermobonding composite fiber and the fiber structure of the present invention will be described in detail using examples.

(Measurement of bulkiness of fiber structure)
A method for measuring the bulkiness characteristics of the fiber structure will be described with reference to FIGS. As shown in FIG. 2, 20 g of the fiber structure B for measurement is put into the transparent box A for thickness change having a base of 200 mm square shown in FIG.

  Next, as shown in FIG. 3, a plate C having an initial load of 200 g is placed on the fiber structure B, and the bulk of the fiber structure B after 1 minute is measured to obtain an initial bulk D.

Further, as shown in FIG. 4, a load E of 2000 g is placed on the plate C of 200 g, and a total of 2200 g of load is applied to the fiber structure B, and the bulk of the fiber structure B after 1 minute is measured. , Compression bulk F. The compression ratio A is obtained by the following equation.
Compression rate a (%) = [(initial bulk D−compression bulk F) / initial bulk D] × 100
Next, as shown in FIG. 5, the load E of 2000 g is removed, the load state is returned to only the 200 g of the plate C, the bulk of the fiber structure B after 10 minutes is measured, and the initial recovery bulk G is obtained. The initial recovery rate b is obtained by the following equation.
Initial recovery rate b (%) = [(initial recovery bulk G−compression bulk F) / (initial bulk D−compression bulk F)] × 100
Further, as shown in FIG. 6, the bulk of the fiber structure B after 6 hours from the removal of the load E of 2000 g is measured and set as a recovery bulk H. The late recovery rate C is calculated by the following formula.
Late recovery rate C (%) = [(late recovery bulk H−compression bulk F) / (initial bulk D−compression bulk F)] × 100
(Heat retention (clo value))
The clo value of the fiber structure was measured according to JIS L1096 (1999).

( Reference Example 1)
(fiber)
(Method for producing polyester-based heat-bonding composite fiber (a))
As polyester-based heat-bonding composite fiber, polyester-based elastomer (A) and polyester (B) are arranged side-by-side, and hollow composite fiber (composite ratio of polyester-based elastomer (A) and polyester (B) is 45:55) was prepared by the following method.

  "Hytrel" (registered trademark) (product number: 4047N, melting point 182 ° C) manufactured by Toray DuPont Co., Ltd. as the polyester elastomer (A) and polyethylene terephthalate (melting point 260 ° C) having an IV of 0.65 as the polyester (B) Are melt-spun at a spinning temperature of 275 ° C. through a spinneret having 300 discharge holes (discharge holes in which four slits having a slit width of 0.10 mm are arranged on the circumference) to be hollow composite fibers. The fiber spun from the die is cooled by spraying air at a temperature of 20 ° C. with a flow of 90 m / min, and then a nonionic spinning oil is applied, and the fiber is temporarily put in a can at a take-up speed of 1000 m / min. Thus, an undrawn yarn tow was obtained. Next, the undrawn yarn tow obtained was stretched by a single step using a liquid bath at a temperature of 90 ° C. at a stretching ratio of 2.83 times, and a mechanical crimp of 10 threads / 25 mm was imparted using a stuffing box. And dried for 20 minutes at a temperature of 85 ° C. and cut to a length of 38 mm to produce a polyester-based heat-bonding conjugate fiber (a) having a single fiber fineness of 2.8 dtex, a fiber length of 38 mm and a hollow ratio of 17%. .

(Method for producing polyester short fiber (b))
A polyethylene terephthalate having an IV of 0.70 is melted, and a spinning temperature of 275 ° C. is passed through a spinneret having 180 holes for discharging hollow fibers (discharge holes in which three slits having a slit width of 0.10 mm are arranged on the circumference). Then, melt spinning is performed so that a hollow portion is formed, and air spun at a temperature of 20 ° C. is blown at a flow rate of 165 m / min on the fiber spun from the die, and then a nonionic spinning oil is applied. The undrawn yarn tow was obtained by placing it in a can once at a take-up speed of 1655 m / min. Next, the undrawn yarn tow obtained was subjected to one-stage drawing using a liquid bath at a temperature of 90 ° C. at a draw ratio of 2.45 times, and a structure difference crimp and a mechanical crimp using a crimper were 7 threads / 25 mm, an oil solution containing polysiloxane at a concentration of 4% by mass is applied by spray, dried at a temperature of 145 ° C. for 10 minutes, cut to a length of 30 mm, and a fiber with a single fiber fineness of 7.6 dtex. A polyester short fiber (b) having a hollow round cross section having a length of 30 mm, a polysiloxane adhesion amount of 0.3 mass%, and a hollow ratio of 35% was produced.

(Fiber structure)
The polyester-based heat-bonding composite fiber (a) and polyester-based short fiber (b) obtained above are laminated at a mass ratio of 15:85 and passed through a fiber opening machine, and then mixed raw cotton through a card machine. It was. This mixed raw cotton was passed through a hot air dryer and heat treated for 10 minutes at a temperature of 190 ° C. to produce a fiber structure.

  The obtained fiber structure was excellent in bulkiness, good in recoverability after compression, and excellent in heat retention. The results are shown in Table 1.

(Example 1 )
(fiber)
(Method for producing polyester short fiber (c))
A polyethylene terephthalate having an IV of 0.65 is melted and melt-spun at a spinning temperature of 285 ° C. through a spinneret having 1284 holes having a round cross-section of 0.23 mm in diameter, and the fiber spun from the die has a temperature of 20 ° C. After cooling by blowing air at a flow rate of 50 m / min, a nonionic spinning oil agent was applied and once put in a can at a take-up speed of 1500 m / min, an undrawn yarn tow was obtained. Next, the obtained undrawn yarn tow was subjected to two-stage drawing at a draw ratio of 2.87 times in the first stage and 2.95 times in the second stage using a liquid bath at a temperature of 93 ° C., and a stuffing box was used. Applying a 15 cm / 25 mm mechanical crimp, spraying an oil solution containing an alkyl phosphate metal salt at a concentration of 10% by mass, drying at 85 ° C. for 20 minutes, to a length of 35 mm By cutting, a short polyester fiber (c) having a round cross section with a single fiber fineness of 0.8 dtex, a fiber length of 35 mm, and an adhesion amount of alkyl phosphate metal salt of 0.19% by mass was produced.

(Fiber structure)
The polyester-based heat-bonding composite fiber (a) obtained in Reference Example 1, the polyester-based short fiber (b), and the polyester (c) obtained as described above are in a mass ratio of 5:50:45 ( b) After being laminated in the order of (c) and (a) and passing through a fiber opening machine, it was mixed raw cotton through a card machine. This mixed raw cotton was passed through a hot air dryer and heat treated for 10 minutes at a temperature of 190 ° C. to produce a fiber structure.

  The obtained fiber structure was excellent in bulkiness, good in recoverability after compression, and excellent in heat retention. The results are shown in Table 1.

(Example 2 )
(fiber)
(Method for producing polyester short fiber (d))
A polyethylene terephthalate having an IV of 0.65 is melted and melt-spun at a spinning temperature of 290 ° C. through a spinneret having 745 holes for Y-shaped fiber discharge (slit width 0.08 mm). After cooling by blowing air at a temperature of 50 ° C. with a flow of 50 m / min, a nonionic spinning oil agent was applied, and once put in a can at a take-up speed of 1200 m / min, an undrawn yarn tow was obtained. Next, the obtained undrawn yarn tow was subjected to one-step drawing at a draw ratio of 3.27 times using a liquid bath at a temperature of 90 ° C., and mechanical crimping of 18/25 mm was given using a stuffing box. An oil solution containing polysiloxane at a concentration of 8% by mass is applied by spray, dried at a temperature of 165 ° C. for 20 minutes, cut to a length of 38 mm, a single fiber fineness of 1.8 dtex, and a fiber length of 38 mm. A polyester short fiber (d) having a Y cross-section with a polysiloxane adhesion amount of 0.75 mass% and a degree of profile of 2.65 was produced.

(Method for producing polyester short fiber (e))
A polyethylene terephthalate having an IV of 0.65 is melted and melt-spun at a spinning temperature of 285 ° C. through a spinneret having 930 holes having a round cross-sectional diameter of 0.3 mm, and the fiber spun from the die has a temperature of 20 ° C. After cooling by blowing air at a flow rate of 50 m / min, a nonionic spinning oil agent was applied and once put in a can at a take-up speed of 1500 m / min, an undrawn yarn tow was obtained. Next, the obtained undrawn yarn tow is stretched by 1.85 times at a draw ratio of 2.85 using a liquid bath at a temperature of 90 ° C., and a mechanical crimp of 18 threads / 25 mm is given using a stuffing box. Then, an oil solution containing polysiloxane at a concentration of 8% by mass is applied by spray, dried at a temperature of 145 ° C. for 20 minutes, cut to a length of 38 mm, a single fiber fineness of 1.3 dtex, and a fiber length of 38 mm. Thus, a polyester short fiber (e) having a round cross section with a polysiloxane adhesion amount of 0.5 mass% was produced.

(Fiber structure)
The polyester-based heat-bonding composite fiber (a) obtained in Reference Example 1, the polyester-based short fiber (b), and the polyester-based short fibers (d) and (e) obtained above are in a mass ratio of 5:50. After being laminated in the order of (b), (d), (e), and (a) in a ratio of 20 to 25, the mixture was passed through a fiber opening machine, and then mixed raw cotton through a card machine. This mixed raw cotton was passed through a hot air dryer and heat treated for 10 minutes at a temperature of 190 ° C. to produce a fiber structure.

  The obtained fiber structure was excellent in bulkiness, good in recoverability after compression, and excellent in heat retention. The results are shown in Table 1.

( Reference Example 2 )
(fiber)
A polyester-based thermoadhesive composite in the same manner as in Example 1 except that the polyester-based elastomer (A) was changed to “Hytrel” (registered trademark) (product number: 4057N, melting point: 163 ° C.) manufactured by Toray DuPont Co., Ltd. Fiber (f) was produced.

(Fiber structure)
A fiber structure was produced in the same manner as in Reference Example 1 except that the polyester-based heat-bonding conjugate fiber was changed to the polyester-based heat-bonding conjugate fiber (f) and the heat treatment temperature was changed to 170 degrees.

  The obtained fiber structure was excellent in bulkiness, good in recoverability after compression, and excellent in heat retention. The results are shown in Table 1.

(Example 3 )
(Fiber structure)
A fiber structure was produced in the same manner as in Example 1 except that the polyester-based heat-bonding conjugate fiber was changed to the polyester-based heat-bonding conjugate fiber (f) and the heat treatment temperature was changed to 170 degrees.

  The obtained fiber structure was excellent in bulkiness, good in recoverability after compression, and excellent in heat retention. The results are shown in Table 1.

(Example 4 )
(Fiber structure)
A fiber structure was produced in the same manner as in Example 2 except that the polyester-based heat-bonding conjugate fiber was changed to the polyester-based heat-bonding conjugate fiber (f) and the heat treatment temperature was changed to 170 degrees.

  The obtained fiber structure was excellent in bulkiness, good in recoverability after compression, and excellent in heat retention. The results are shown in Table 1.

(Comparative Example 1)
(Fiber structure)
The polyester-based short fibers (b) obtained in Example 1 were passed through a fiber opening machine and then passed through a card machine to produce a fiber structure. The resulting fiber structure had a high initial bulkiness, but was poor in compression durability, recoverability after compression, and heat retention. The results are shown in Table 1.

(Comparative Example 2)
(fiber)
As a polyester-based heat-bonding composite fiber, a core-sheath type composite fiber (composite of sheath and core) having a low melting point polyester (melting point 110 ° C.) made of an isophthalic acid copolymer as a sheath and polyethylene terephthalate (melting point 260 ° C.) as a core The ratio was 50:50) by mass and was produced by the following method.

  Low melting point polyester and polyethylene terephthalate having an IV of 0.65 are melted and melt-spun at a spinning temperature of 280 ° C. through a core-sheath type spinneret having 532 holes to form a core-sheath type composite structure. After cooling the formed fiber by blowing air at 20 ° C. with a flow of 60 m / min, a spinning oil agent is applied, and the fiber is once put in a can at a take-up speed of 1350 m / min to obtain an undrawn yarn tow. Next, the obtained undrawn yarn tow was stretched by one step using a liquid bath at a temperature of 80 ° C. at a draw ratio of 3.00 times, and a 12 crimps / 25 mm mechanical crimp was imparted using a stuffing box. And dried for 20 minutes at a temperature of 55 ° C. and cut to a length of 38 mm to produce a polyester-based thermobonding conjugate fiber (g) which is a core-sheath composite having a single fiber fineness of 2.2 dtex and a fiber length of 38 mm. .

(Fiber structure)
A fiber structure was produced in the same manner as in Example 1 except that the polyester-based heat-bonding conjugate fiber was changed to the polyester-based heat-bonding conjugate fiber (g) and the heat treatment temperature was changed to 145 degrees.

  The obtained fiber structure was poor in recoverability and heat retention after compression. The results are shown in Table 1.

(Comparative Example 3)
(fiber)
I tried to manufacture polyester heat-bonded raw cotton (h) using only "Hytrel" (registered trademark) (product number: 4047N) manufactured by Toray DuPont Co., Ltd. there were.

(Comparative Example 4)
(fiber)
As a polyester-based heat-bonding conjugate fiber, a polyester-based elastomer (A) and a polyester (B) are arranged side-by-side in a composite fiber (the compound ratio of the polyester-based elastomer (A) and the polyester (B) is 45:55 by mass ratio. ) Was prepared by the following method.

  “Hytrel” (registered trademark) manufactured by Toray DuPont Co., Ltd. (product number: 4047N, melting point 182 ° C.) and polyethylene terephthalate (melting point 260 ° C.) having an IV of 0.65 are melted to form a side-by-side composite structure. Are melt-spun through a side-by-side type spinneret having 352 holes at a spinning temperature of 275 ° C., the fibers spun from the die are cooled by blowing air at 20 ° C. at a flow of 80 m / min, and then a spinning oil agent is applied, An undrawn yarn tow is obtained by placing it in a can once at a take-up speed of 1000 m / min. Next, the obtained undrawn yarn tow is stretched by 1.83 times using a liquid bath at a temperature of 80 ° C. at a draw ratio of 2.83 times, and a 12 crimps / 25 mm mechanical crimp is imparted using a stuffing box. And dried for 20 minutes at a temperature of 85 ° C. and cut to a length of 38 mm to produce a core-sheath composite polyester-based heat-bondable short fiber (i) having a single fiber fineness of 2.8 dtex and a fiber length of 38 mm. .

(Fiber structure)
A fiber structure was produced in the same manner as in Example 2 except that the polyester-based heat-bonding conjugate fiber was changed to the polyester-based heat-bonding conjugate fiber (i). The obtained fiber structure was poor in recoverability and heat retention after compression. The results are shown in Table 1.

(Comparative Example 5)
(fiber)
As a polyester-based heat-bonding conjugate fiber, a polyester-based elastomer (A) as a sheath, a core-sheath-type conjugate fiber having a polyester (B) as a core (composite ratio of the sheath and the core is 45:55 by mass ratio), It was manufactured by the following method.

  “Hytrel” (registered trademark) (product number: 4047N) manufactured by Toray DuPont Co., Ltd. and polyethylene terephthalate are respectively melted, and the spinning temperature is 275 ° C. through a core-sheath spinneret having 437 holes for forming a core-sheath composite structure. The fiber spun from the base is cooled by blowing air at 20 ° C. at a flow rate of 60 m / min, and then a spinning oil agent is applied, and once placed in a can at a take-up speed of 1000 m / min. An undrawn yarn tow is obtained. Next, the undrawn yarn tow obtained was stretched by one step using a liquid bath at a temperature of 80 ° C. at a draw ratio of 2.54 times, and 13 threads / 25 mm of mechanical crimping was performed using a stuffing box. Applied, dried at a temperature of 55 ° C. for 20 minutes, cut to a length of 38 mm, and produced a core-sheath composite polyester-based heat-adhesive short fiber (j) having a single fiber fineness of 2.8 dtex and a fiber length of 38 mm. did.

(Fiber structure)
A fiber structure was produced in the same manner as in Example 2 except that the polyester-based heat-bonding conjugate fiber was changed to the polyester-based heat-bonding conjugate fiber (i). The resulting structure was poor in recoverability and heat retention after compression. The results are shown in Table 1.

A: Transparent box B: Fiber structure C: 200 g plate D: Initial bulk E: 2000 g load F: Compression bulk G: Initial recovery bulk H: Late recovery bulk

Claims (3)

A composite fiber comprising a polyester elastomer (A) having a melting point of 90 ° C. or more and 200 ° C. or less and a polyester (B) having a melting point of 220 ° C. or more, and comprising the polyester elastomer (A) and the polyester (B) The ratio is in the range of (A) / (B) = 60/40 to 10/90 by mass ratio, the polyester elastomer (A) and the polyester (B) are arranged in a side-by-side type, and the composite fibers Lupo Riesuteru based heat-bonding conjugate fiber void ratio inside the fiber outer shape has a hollow portion of 5-50% in the fiber cross-section, a plurality of polyester staple fibers and cotton mixing has been made fibrous structure. It confounded the port Riesuteru based heat-bonding composite fibers, the intersection is thermally bonded by a polyester-based elastomer (A), or / and port Riesuteru based heat-bonding composite fibers with other polyester-based short fibers are entangled , the fiber structure of claim 1, wherein the intersection is thermally bonded by a polyester-based elastomer (a). Ratio of the polyester staple fiber and Po Riesuteru based heat adhesive composite fibers, the mass ratio, according to claim 1 or 2 wherein the polyester short Textile / Po Riesuteru based heat-bonding conjugate fiber = 99 / 1-70 / 30 Fiber structure.

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