JP2007046194A - Cheese package of concentric sheath-core conjugated fiber and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a package wound with a sheath-core conjugated fiber having high productivity and giving a cloth having uniform surface appearance and dye uniformity. <P>SOLUTION: The cheese package is wound with a conjugated fiber having a polyester composed mainly of a polyethylene terephthalate as the core component and a polyester composed mainly of polytrimethylene terephthalate as the sheath component and having a concentric sheath-core cross-section in longitudinal direction and the package satisfies the requirements that (1) the bulging ratio is -5 to 5%, (2) the edge protrusion ratio is 0-5% and (3) the variation of the bulging ratio with time is ≤50%. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cheese-like package wound with a core-sheath composite fiber containing polytrimethylene terephthalate, and not only good unraveling property, but also physical property irregularities in the package end face period and package inner and outer layers are suppressed, The present invention relates to a package with excellent productivity and a manufacturing method thereof.

  Polytrimethylene terephthalate (hereinafter referred to as 3GT) obtained by polycondensation of a lower alkyl ester of terephthalic acid typified by terephthalic acid or dimethyl terephthalate and trimethylene glycol (1,3-propanediol) is low. Features such as elastic modulus, soft texture, and easy dyeing have attracted attention, and in recent years, the demand has greatly expanded.

  Technical disclosure has already been made on a cheese-like package related to 3GT (see Patent Document 1 and Patent Document 2). However, all the technical contents are those in the case where 3GT is produced alone, and the contents relating to the core-sheath type composite yarn are not disclosed at all. Although it is described in the literature group that the ear height ratio of the package is suppressed, when applied to this composite yarn, the unwinding property is certainly improved, and the dyeing defects due to the unraveling failure can be reduced. Although it was as a well-known technique, the physical property difference of a package inner layer and an outer layer and the physical property difference in a package end surface and a center part are large, and the problem that the quality including dyeing will become remarkable when using it as a cloth may become remarkable. all right. Further, it has been found that in the manufacturing method, it is difficult to obtain a good package with the known technique, and the productivity is inferior.

Moreover, although the core-sheath type composite fiber using PET as the core component and 3GT as the sheath component is disclosed (see Patent Document 3 and Patent Document 4), the composite fiber obtained in the examples is based on a two-step method. There is no technical disclosure regarding the cheese-shaped package.
JP 2003-81533 A (Claims) WO02 / 004332 Publication (Claims) JP-A-11-93021 (Claims) JP-A-11-81048 (Claims)

  The present invention is intended to solve the above-mentioned conventional problems. In addition to good unraveling properties, the package end face period, the package inner layer, and the physical layer unevenness in the outer layer are suppressed, and the package is excellent in productivity. And providing a manufacturing method thereof.

The present invention is achieved by adopting the following items.
(1) A composite fiber having a concentric core-sheath cross-sectional shape is wound in the longitudinal direction, in which a polyester mainly composed of polyethylene terephthalate is arranged in the core component, and a polyester mainly composed of polytrimethylene terephthalate is arranged in the sheath component. The cheese-like package characterized by satisfying the following conditions (a) to (c):
(A) Cheese-like package bulge rate is -5-5%
(I) Ear height ratio of cheese-like package is 0 to 5%
(C) The rate of change with time of the swelling rate is 50% or less. (2) The cheese-like package according to (1) above, comprising a composite fiber having a concentric core-sheath cross-sectional shape with a delayed shrinkage rate of 0 to 3%. .
(3) A composite fiber having a concentric core-sheath cross-sectional shape is wound in the longitudinal direction, in which a polyester mainly composed of polyethylene terephthalate is arranged in the core component, and a polyester mainly composed of polytrimethylene terephthalate is arranged in the sheath component. A cheese-like package manufacturing method characterized by satisfying the following conditions (a) to (c) when obtaining a cheese-like package.
(A) Vc = α × Vp, α = 1.001 to 1.01
(A) Tc = 0.1 to 0.3 cN / dtex
(C) Vc = 3800 to 5000 m / min where Vp is the speed of the yarn when wound around the cheese-like package, Vc is the speed of the contact roll in contact with the package, and Tc is the thread tension at the contact roll inlet.

  According to the present invention, there is provided a package wrapped with a polyester core-sheath type composite fiber that has a good productivity and has a uniform surface feeling and dyeing uniformity, which cannot be achieved by the prior art. be able to.

  Hereinafter, the present invention will be described in detail.

  First, the composite fiber wound around the package of the present invention will be described. The polyester core-sheath composite fiber of the present invention has a concentric core-sheath cross-sectional shape, and the PET disposed in the core part is polyethylene terephthalate in which 90 mol% or more is composed of repeating units of ethylene terephthalate. Polyethylene terephthalate is a polyester obtained using terephthalic acid as the main acid component and ethylene glycol as the main glycol component. However, it may contain a copolymer component capable of forming another ester bond at a ratio of 10 mol% or less. Examples of copolymerizable compounds include dicarboxylic acids such as isophthalic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, and sebacic acid, while glycol components include, for example, ethylene glycol, diethylene glycol, butanediol, neopentyl glycol, and cyclohexanedimethanol. , Polyethylene glycol, polypropylene glycol and the like can be mentioned, but are not limited thereto. Further, titanium dioxide as a matting agent, silica or alumina fine particles as a lubricant, hindered phenol derivatives, coloring pigments and the like as antioxidants can be added as necessary.

  Moreover, 3GT distribute | arranged to a sheath part is a poly trimethylene terephthalate which 90 mol% or more consists of a repeating unit of a trimethylene terephthalate. Polytrimethylene terephthalate is a polyester obtained using terephthalic acid as the main acid component and trimethylene glycol as the main glycol component. However, it may contain a copolymer component capable of forming another ester bond at a ratio of 10 mol% or less. Examples of copolymerizable compounds include dicarboxylic acids such as isophthalic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, and sebacic acid, while glycol components include, for example, ethylene glycol, diethylene glycol, butanediol, neopentyl glycol, and cyclohexanedimethanol. , Polyethylene glycol, polypropylene glycol and the like can be mentioned, but are not limited thereto. Further, titanium dioxide as a matting agent, silica or alumina fine particles as a lubricant, hindered phenol derivatives, coloring pigments and the like as antioxidants can be added as necessary.

  Although the physical properties of the composite fiber are not particularly specified, the following ranges are preferable for obtaining a composite fiber utilizing the characteristics of 3GT.

  The strength is preferably 3.0 to 5.0 cN / dtex. Furthermore, when the elongation is 30 to 60%, a composite fiber having excellent color developability and good handling in post-processing can be obtained. In order to make better use of the characteristics of 3GT, it is easy to obtain good color developability when the elongation is 35% or more.

  In addition, the shrinkage performance is moderate softness in the range of 7 to 20% in boiling water shrinkage, 10 to 20% in 160 ° C dry heat shrinkage, and 0.1 to 0.4 cN / dtex in heat shrinkage stress peak value. And suitable for obtaining color developability. In addition, the initial tensile resistance is in the range of 20 to 40 cN / dtex, which is appropriate for obtaining an appropriate soft feeling. In order to obtain these physical properties, the composite ratio (PET: 3GT) of PET as the core component and 3GT as the sheath component is preferably 20:80 to 80:20.

  The composite fiber as described above is a preferable composite fiber for use in various apparel applications and material applications. However, in order to suppress uneven physical properties of the composite fiber, a package shape described below is required.

  The cheese-like package of the present invention uses a core having an inner diameter of 50.8 mm (2 inches) to 152.4 mm (6 inches), an outer diameter of 55 to 170 mm, and a length of 50 to 300 mm, and has a fiber shape as shown in FIG. Refers to a package wrapped around. This package has a bulge rate of -5 to 5% and an ear height rate of 0 to 5%. Here, as shown in FIG. 1, the bulge rate and the ear height rate are expressed as follows, assuming that the maximum package width Wmax, the minimum package width Wmin, the maximum package diameter Dmax, and the minimum package diameter Dmin are as follows: This is a calculated value.

Swelling rate (%) B = {(Wmax−Wmin) / Wmin} × 100
Ear height ratio (%) S = {(Dmax−Dmin) / Dmin} × 100
When the swelling rate exceeds the above specified range, the package is tightened, and the physical properties of the inner layer portion of the package change. In particular, the shrinkage characteristics are changed, and after making a fabric, the dyeing unevenness becomes remarkable when dyeing, which is not preferable. A more preferable range of the swelling rate is -4 to 4%. Also, if the ear height ratio exceeds the above range, the winding hardness at the package end face and the central part is different, resulting in a difference in physical properties such as shrinkage characteristics at the end part and the central part. Since it becomes a fault, it is not preferable. A more preferable range of the ear height ratio is 0 to 3.5%. Furthermore, the bulge rate needs to have a small rate of change with time from immediately after winding. Here, the rate of change with time is B0 when the swelling rate measured 10 minutes after winding, and B1 when the swelling rate after standing for 24 hours in an atmosphere of 25 ° C. and 65% RH after winding is as follows: It is a value calculated by an expression.

Rate of change of swelling rate with time (%) R (B) = {(B1-B0) / B0} × 100
This rate of change with time is 50% or less. By setting it to 50% or less, the physical property difference between the package inner layer and the outer layer and the physical property difference between the package end surface and the central portion can be suppressed. Even if the swelling rate after 24 hours is 4%, if the swelling rate immediately after winding is 2%, the rate of change over time is 100%. This means that the physical properties are greatly changed after winding, and the physical property difference becomes large, which is not preferable. A more preferable range of the rate of change with time is 40% or less, and a more preferable range is 30% or less.

Moreover, it is preferable that the delay shrinkage rate of the composite fiber extract | collected from the package is 0 to 3%. Here, the delayed shrinkage is 1 m of the composite fiber immediately after winding the package, and a load of 5.4 × 10 ⁻³ cN / dtex is applied, and the gravity shrinkage is 24 under gravity in an atmosphere of 25 ° C. and 65% RH. The rate of change in length after standing for a period of time, L0 is the length of the composite fiber immediately after winding the package under a load of 5.4 × 10 ⁻³ cN / dtex, and L1 is the length after standing for 24 hours. And is calculated by the following formula.

Delayed shrinkage (%) NS = {(L0−L1) / L0} × 100
By setting the delayed shrinkage rate to 3% or less, it is possible to easily suppress the tightening of the package after winding the package, and to easily suppress the rate of change with time of the swelling rate. A more preferable delayed shrinkage rate is 2% or less.

  The preferable manufacturing method of the cheese-like package of this invention demonstrated above is demonstrated.

  The conjugate fiber for obtaining the package of the present invention is produced by any known method, but the melt spinning method is the best in consideration of the stability and productivity of the composite structure. In melt spinning the composite fiber, 3GT as one component is preferably melted at 240 to 280 ° C. In the melting, a pressure melter method and an extruder method can be mentioned, and melting by an extruder is preferable from the viewpoint of uniform melting and retention prevention. On the other hand, the other component, PET, is preferably melted at 260 to 300 ° C. using an extruder as in 3GT. Separately melted polymers pass through separate pipes, weigh and then flow into the base pack. Under the present circumstances, it is preferable that piping passage time is 5 to 30 minutes from a viewpoint of suppressing thermal deterioration. The polymer that has flowed into the pack is merged by the die, is combined into a core-sheath type by a known technique, and is discharged from the die. The polymer temperature at this time is suitably 263 to 285 ° C. If it is this range, the composite fiber which utilized the characteristic of 3GT can be manufactured.

  The polymer discharged from the die is cooled and solidified, and after the oil is applied, it is taken out. The take-up speed is possible at any speed of 1000-5500 m / min. In the case of drawing in an undrawn yarn or partially oriented yarn region of 100 to 4000 m / min, a method of pre-winding, drawing, and heat-treating to make a drawn yarn without winding is used. In the above-described direct spinning drawing method, the draw ratio is suitably set so that the drawn yarn elongation is in the range of 30 to 60%. Further, in any of the spinning and drawing processes, it is possible to perform entanglement using a known entanglement device up to winding. If necessary, it is possible to increase the number of confounding by giving multiple times. Furthermore, it is also possible to add an additional oil immediately before winding.

  An outline of the apparatus preferably used is shown in FIG. The yarn once taken up at 1000 to 4000 m / min with the hot roller 5 heated to 40 to 80 ° C. is wound on the hot roller 5 for several turns for preheating, and the speed is 3800 to 5500 m / min. Then, it is drawn to the hot roller 6 and stretched. At this time, the hot roller 6 is heated to 110 to 170 ° C. and wound by several turns to perform heat setting. After provision of the entanglement, the tension is adjusted together with the cooling of the yarn by the two godet rollers 8 and 9, and the product is wound around the package by a winder. In the winder, the package winding tension is adjusted by the contact roll 10 in contact with the package.

The winding conditions for the package are as follows: Vp is the speed of the yarn when wound into the cheese-like package, Vc is the speed of the contact roll in contact with the package, and Tc is the thread tension at the contact roll inlet,
(1) Vc = α × Vp, α = 1.001 to 1.01
(2) Tc = 0.1 to 0.3 cN / dtex
(3) It is preferable to set Vc = 3800 to 5000 m / min. By setting the contact roll speed to be 1.001 to 1.01 times faster than the winding speed of the package, it is possible to easily obtain a good bulge rate and ear height rate of the package. When α (hereinafter α is referred to as overfeed) is 1.001 or more, it becomes easy to optimize the tension when wound on the package, and a more preferable range is 1.0015 or more. Furthermore, by setting α to 1.01 or less, it becomes easy to suppress yarn dropping from the package end surface. A more preferable range is 1.008 or less. Furthermore, the yarn tension at the contact roll inlet is preferably 0.1 to 0.3 cN / dtex. When the tension is set to 0.1 cN / dtex or more, the peelability of the yarn from the godet roller is improved, it becomes easy to suppress the yarn swinging between the godet roller and the winder, and the winding speed is increased. , It becomes easy to suppress yarn breakage at the Gode roller. A more preferable tension is 0.12 cN / dtex or more. By setting the tension to 0.3 cN / dtex or less, it becomes easy to suppress the tension in the contact roll, and it becomes easy to obtain a good package. A more preferable tension is 0.25 cN / dtex or less. Furthermore, the winding speed is preferably 3800 to 5000 m / min. Productivity improves by setting it as 3800 m / min or more, and since it is easy to obtain the thread | yarn of preferable intensity | strength and elongation by setting it as 5000 m / min or less, it is preferable. A more preferable speed range is 3900 to 5000 m / min.

  Hereinafter, although an example is given and explained concretely, the present invention is not limited to an example. In addition, the main measured value of the Example was measured with the following method.

(1) Intrinsic viscosity Intrinsic viscosity [η] is a value determined based on the following defining formula.

Ηr in the definition formula is a value obtained by dividing the viscosity at 25 ° C. of a diluted solution of 3GT dissolved in O-chlorophenol having a purity of 98% or more by the viscosity of the solvent itself measured at the same temperature. Is defined. C is the solute weight value in grams in 100 ml of the solution.

(2) Swelling rate, rate of change of swelling rate with time Swelling rate (%) B = {(Wmax−Wmin) / Wmin} × 100
However, Wmax and Wmin are the maximum width and the minimum width of the package as shown in FIG.

Rate of change of swelling rate with time (%) R (B) = {(B1-B0) / B0} × 100
However, B0 represents the bulging rate after 10 minutes of winding, and B1 represents the bulging rate after standing for 24 hours in an atmosphere of 25 ° C. and 65% RH after winding.

(3) Ear height ratio Ear height ratio (%) S = {(Dmax−Dmin) / Dmin} × 100
However, as shown in FIG. 3, Dmax and Dmin are the maximum and minimum diameters of the package, and S1 represents the ear height ratio after standing for 24 hours in an atmosphere of 25 ° C. and 65% RH after winding.

(4) Delay Shrinkage Rate Delay Shrinkage Rate (%) NS = {(L0−L1) / L0} × 100
However,
L0: 1 m of the composite fiber immediately after winding of the package was collected, and the length when applied with a load of 5.4 × 10 ⁻³ cN / dtex L1: 5.4 × 10 5 in an atmosphere of 25 ° C. and 65% RH ^-3 Length after standing for 24 hours under load of cN / dtex After that, measurements related to the physical properties of the composite fiber are taken after 24 hours in an atmosphere of 25 ° C. and 65% RH after sampling the package. The measurement was performed.

(5) Strength and elongation Measured according to JIS L1013 (1999).

(6) Boiling water shrinkage Boiling water shrinkage (%) = {(L0−L1) / L0} × 100
L0: skein of raw yarn, skein length at a measurement load of 0.029 cN / dtex L1: treatment of raw yarn with no load in boiling water at 100 ° C. for 15 minutes, air drying, measurement load of 0.029 cN (7) Dye uniformity Uniformity of package outer layer (sample A) and package inner layer (sample B), tetraseal navy blue SGL 0.275% owf as dye, auxiliary agent Tetrocin PE-C 5.0% owf and Nikkasan Salt # 12001.0% owf as a dispersing agent were used, and dyeing was performed at a bath ratio of 1: 100 at 50 ° C. for 15 minutes and further at 90 ° C. for 20 minutes. The sample after dyeing was subjected to a sensory test for uneven dyeing and a dyeing difference between samples A and B and evaluated in three stages. In addition, a pass level is more than (circle).

○○: Very good ○: Excellent ×: Poor uniformity Example 1
PET with an intrinsic viscosity of 0.51 as the core component and 3GT with an intrinsic viscosity of 1.13 as the sheath component were melted at 285 ° C. and 260 ° C., respectively, and weighed with a pump. In order to form a cross-sectional shape of the concentric core sheath, it was poured into a known die. The composite ratio was a ratio of PET: 3GT = 30: 70. Pipe passage time of each polymer was 12 minutes for PET and 5 minutes for 3GT. The yarn discharged from the die is cooled by the apparatus shown in FIG. 2 and applied with an oil agent. Then, the yarn is taken up by the hot roller 5 heated to 55 ° C. at a speed of 1600 m / min, and is not taken up once, and is 4100 m / min. The film was drawn around a hot roller 6 heated to 150 ° C. at a speed of, and stretched and heat set. Further, after drawing the two godet rollers 8 and 9 at 4020 m / min, the tension at the contact roll inlet is 0.15 cN / dtex, the contact roll speed is 3970 m / min, and the package winding speed is 3962 m / min. The overfeed was wound up as 1.0020 to obtain a cheese-like package having an outer diameter of 340 mm made of 84 dtex-48f core-sheath type composite yarn. The shape of the obtained package, the physical properties of the composite yarn, and the results of the dyeing property evaluation are as shown in Table 1, and the dyeing uniformity was excellent.

Example 2
The yarn was produced under the same conditions as in Example 1 except that the composite ratio was changed to a core-sheath type composite yarn of PET: 3GT = 70: 30. The tension at the contact roll inlet was 0.12 cN / dtex. The package shape obtained was good and the dyeability was good.

Example 3
With the same composite ratio as in Example 1, the hot roller 6 temperature is 130 ° C., the tension at the contact roll inlet is 0.25 cN / dtex, the contact roll speed is 3980 m / min, and the package winding speed is 3960 m / min, that is, overfeed is performed. Rolled up as 1.0050. Conditions other than the above were the same as in Example 1. The shape of the obtained package was slightly larger than that of Example 1 in terms of both bulge rate and rate of change with time, but dyeability was good.

Comparative Example 1
In the same composite ratio as in Example 1, the tension at the contact roll inlet was 0.38 cN / dtex, the contact roll speed was 4010 m, the package winding speed was 3990 m / min, that is, the overfeed was wound up to 1.0050. Conditions other than the above were the same as in Example 1. The resulting package had a large bulge rate and ear height rate. As a result of measuring physical properties, there was a large difference in boiling water shrinkage between the inner layer and outer layer of the package, and as a result of dyeing, there were streaky defects and dyeing differences between the inner layer and the outer layer, which were not practical.

Comparative Example 2
The same die as in Example 1 was used, the temperature of the hot roller 6 was 100 ° C., the tension at the contact roll inlet was 0.10 cN / dtex, the contact roll speed was 3960 m / min, and the package winding speed was 3940 m / min, that is, overfeed. Was wound up as 1.0050. Conditions other than the above were the same as in Example 1. The resulting package did not have a large bulge rate or ear height rate, but the bulge rate changed over time, and as a result of physical property measurement, the difference in boiling water shrinkage between the inner and outer layers of the package was large. Although the defect was acceptable, there was a difference in dyeing between the inner layer and the outer layer, and it was not practical.

An example of the package on cheese in this invention is shown. An example of the manufacturing process preferably used in the present invention will be shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Yarn cooling fan 3 Oil supply device 4 Entangling device 5 Hot roll 6 Hot roll 7 Entangling device 8 God roll 9 God roll 10 Contact roll 11 Package

Claims (3)

A composite fiber having a concentric core-sheath cross-sectional shape is wound in the longitudinal direction, in which a polyester mainly composed of polyethylene terephthalate is arranged in the core component, and a polyester mainly composed of polytrimethylene terephthalate is arranged in the sheath component. A cheese-like package characterized by satisfying the conditions (1) to (3).
(1) Puff rate of cheese-like package is -5-5%
(2) Ear height ratio of cheese-like package is 0-5%
(3) The rate of change over time of the swelling rate is 50% or less   The cheese-like package according to claim 1, comprising a composite fiber having a concentric core-sheath cross-sectional shape having a delayed shrinkage of 0 to 3%. Polyester containing polyethylene terephthalate as the main component is arranged in the core component, and polyester containing polytrimethylene terephthalate as the main component is arranged as the sheath component. When obtaining a package, the manufacturing method of the cheese-like package characterized by satisfy | filling the conditions of the following (1)-(3).
(1) Vc = α × Vp, α = 1.001 to 1.01
(2) Tc = 0.1 to 0.3 cN / dtex
(3) Vc = 3800 to 5000 m / min where Vp is the speed of the yarn when wound around the cheese-like package, Vc is the speed of the contact roll in contact with the package, and Tc is the thread tension at the contact roll inlet.

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