JP4419503B2 - Pile fiber and pile fabric - Google Patents

Description

  The present invention provides a pile fiber and a pile fabric that can improve the light resistance, hair fall resistance, abrasion resistance, and white blurring, which are problems, without inferior the soft texture and silky color development characteristics of polypropylene terephthalate fiber. It is about.

  Today, with the development of synthetic fibers, polyester fibers are mainly used for sheet materials in the interior field, starting with clothing, because of their superiority in functionality, ease of handling, and fashion. In addition, this polyester fiber-based era continues, and there is no doubt about technological improvement and development.

  However, in recent years, efforts to recycle have been strengthened due to global environmental conservation issues, and the departure from petroleum-based synthetic fibers as the next-generation fiber has been screamed. Posture is seen. Needless to say, while there is a global demand for fibers and resins that can be converted to natural cultivation-reduction type, it is becoming necessary in the textile industry.

  At present, there are no fibers that have achieved the outstanding characteristics, functionality, and ease of handling of polyester fibers. From the above background, polylactic acid fibers and polypropylene terephthalate (also referred to as polytrimethylene terephthalate) fibers will be used in the future. It has been proposed, and technology has been completed in one field from spinning to spinning and high-order processing, and it has been advanced to practical use. In addition, the part beyond the temperament of polyester fibers has been attracting attention, and it has been greatly highlighted as a material for future development. Naturally, the automobile industry has been showing active movement toward commercialization.

  Currently, 100% polypropylene terephthalate fibers are composed of polypropylene terephthalate chips, which have insufficient potential for fiber performance and product requirements. As a means to cover the inherent defects of the fiber, the establishment of technology with a side-by-side structure with polyester fibers and fabric formation have been achieved, but limited because they constitute coil crimps due to differences in the respective shrinkage characteristics. Applicable only to the clothing field. Furthermore, although research on core / sheath structures and product evaluation have been promoted, it has been desired to clear many targets such as technology, performance, and potential identification from polymer raw materials.

  The proposal for the above-mentioned raised fabric of polypropylene terephthalate fiber is a product field that can make use of the soft feel, silky luster, and high stretchability of the fiber itself, but it is still a developing fiber, and polyester in vehicle interior materials. Performance like fiber has not been achieved, and it is necessary to expect further technological development in the future until light resistance, wear resistance, white blur, etc. can be cleared as applied to main sheet materials for vehicle interiors. It was an entity.

  Although it is a polypropylene terephthalate fiber having such substance and potential, as a known technique related to pile fiber and fabric to be utilized, at least 90% by weight is composed of polytrimethylene terephthalate, and its single yarn crimp pitch 500 There has been proposed a pile fabric having a structure in which a crimp elongation ratio of ˜2000 μm and a crimp elongation rate of 10% or less is regulated, and has a silky soft feeling and hardly causes white blurring (see, for example, Patent Document 1).

  In addition, using pile fibers that contain flat fibers made of homopolypropylene terephthalate polyester as a pile yarn can prevent problems such as texture, pile resistance, hair fall, white blur hue difference, pile pilling when used, and texture changes. A pile fabric that can be solved has also been proposed (see, for example, Patent Document 2).

  Furthermore, there is also a proposal that a fluid jetting yarn having a loop or fluff in which 30 to 70% or more of the surface layer portion of the fiber cross section is composed of at least polytrimethylene terephthalate hardly causes a fastener phenomenon (for example, Patent Document 3). reference).

However, although all of these proposals show the characteristics of the fiber itself, the fiber performance / quality potential is still low, the strength of raw yarn and raw cotton is low, and the elongation is high. There are also many problems such as high shrinkage characteristics. Therefore, there are many problems in the processability of raw yarn / raw cotton production, false twist prescription and fabricization, especially when applied to vehicle interior main sheet material, light resistance, abrasion resistance, crimp sag, It is predicted that white blurring etc. will be fully cleared, but it has not been established by the distributed products.
Japanese Patent No. 3208362 JP 2000-328393 A Japanese Patent No. 3199109

  The present invention pays attention to the level of polypropylene terephthalate fiber and the problems and challenges still in the field to which the above-mentioned conventional technology is applied. As a result of the technological development that incorporates the performance and functionality of the fiber, it is possible to apply it to the interior pile fabric field by measuring the level of polypropylene terephthalate fiber, and it also exhibits a unique soft texture and suede feeling. It is an object of the present invention to provide a pile fiber and a pile fabric that are capable of obtaining performance that can withstand a vehicle interior fabric, which is close to the characteristics of polyester fibers excellent in light resistance, wear resistance, and hair fall resistance. .

The present invention adopts the following configuration in order to solve the above problems. That is,
- the sheath component of the fiber outer surface is composed of 99 to 50 wt% of polypropylene terephthalate polymer has a concentric core-sheath structure core component is a composite fiber composed of polyester-based polymer of 1 to 50 wt% , single fiber fineness of the composite fiber Ri der 5 dtex or less, and the pile fibers hair falling property is characterized der Rukoto tertiary or higher.

  (2) The pile fiber according to (1), wherein the composite fiber has an irregular cross-sectional shape.

( 3 ) A pile fabric comprising the pile fiber according to (1) or (2) .

  (5) A pile fabric characterized in that the composite fiber having the irregular cross-sectional shape according to claim 2 is used for a pile fiber, and the light resistance performance is grade 3 or higher.

( 5 ) The pile fabric according to (3) or (4) , which is for a vehicle.

  According to the present invention, a polypropylene terephthalate polymer, which is expected to be the future as a new material, is used as a composite fiber having one constituent component and a polyester-based polymer as the other constituent component. By using the fiber as a pile fiber, The napped fabric also exhibits a unique soft texture and suede sensation, and obtains performance that can withstand vehicle interior fabrics, which is close to the characteristics of polyester fiber with excellent light resistance, wear resistance, and hair fall resistance. Is possible.

  Polypropylene terephthalate fiber, when used alone or in homo, presents significantly inferior properties in terms of strength, heat shrinkability, crimp fixation, wear durability, light resistance, etc. Compared with polyester fiber It is a level that does not become.

  In particular, the inferiority becomes a problem when deployed on a raised pile.

  In addition, in terms of application development when used alone or in homogeneity, considerable technical progress has been made in proposals for a side-by-side structure with other polyester polymers in order to improve problems and improve quality. However, a coil crimped structure is formed due to the difference in shrinkage characteristics in order to develop the napped pile, which makes it difficult to adapt to a pile fabric that aims at napping properties.

  Therefore, research and sincerity, trial manufacture and evaluation are repeated to solve the above problems, and the polymer temperament of polypropylene terephthalate fiber is improved. In particular, it has been found that a concentric core-sheath structure is effective.

  In the present invention, 99-50% by weight is a pile fiber forming a composite structure in which a polypropylene terephthalate polymer is one component and a polyester polymer is the other component. We propose to build a pile fabric field.

As a form, as shown in the embodiment shown in FIG. 1, the polypropylene terephthalate polymer A is arranged in a ratio of 99 to 50% by weight in the sheath component on the outer surface of the fiber, and the polyethylene terephthalate polymer B is in the ratio of 1 to 50% by weight in the core component. the arranged and sheath / core of not is preferred to a core-sheath type structure. By arranging polypropylene terephthalate polymer on the sheath side, it exhibits the soft texture and silky coloring that are the characteristics of the fiber, in particular, the inferiority of light resistance improvement, napping property, wear durability, and hair fall resistance Is covered with polyester fiber to obtain a high quality napped pile fabric.

  The polypropylene terephthalate polymer ratio is preferably 97 to 60% by weight (polyester polymer ratio is 3 to 40% by weight), more preferably, in order to improve light resistance without deteriorating soft and silky feeling. The ratio is 95 to 70% by weight (the polyester polymer ratio is 5 to 30% by weight).

  Here, as the fiber cross-sectional shape, as shown in FIG. 1 (1), both the sheath component and the core component on the outer surface of the fiber are perfect circles, or both the sheath component and the core component are shown in FIG. 1 (2). As shown in FIG. 1 (3), it is possible to apply an oval shape in which the sheath component is an elliptical eight-leaf shape and the core component is an elliptical shape.

  Furthermore, it is more desirable if the polyester polymer on the core side is an elliptical shape with a flatness of 1.5 to 2, a two-ball structure, a hollow shape, or an elliptical eight-leaf shape.

  1 (3) can be used as an interior pile fabric having an oval eight-leaf shape, which is softer, the pile surface is more voluminous, and has an excellent suede feel.

  Also, FIG. 2 having a structure opposite to the above is an example in which the polyester polymer B is arranged in the sheath component and the polypropylene terephthalate polymer A is arranged in the core component, and as shown in FIG. The sheath component and the core component may be elliptical, or as shown in FIG. 2 (2), the sheath component may be an elliptical eight-leaf shape and the core component may be an elliptical shape. The ratios and effects are the same as described for FIG. In particular, the pile fabric in the napped form has no change in characteristics because the fiber cross-sectional direction becomes visual.

  On the other hand, FIG. 3 shows a side-by-side structure having a highly deformed cross section in which the fiber cross-sectional shape is an elliptical eight-leaf shape. As the composite structure, a product having a uniform polymer ratio can be obtained in a quality that is stable in terms of property balance and production. However, since the structure has coil crimps due to the difference in characteristics of each polymer, the draw yarn form cannot provide a preferable material for a general nail pile interior material that requires napping quality and high quality.

  As for the single fiber fineness, in any of the forms shown in FIG. 1 and FIG. 2, a multifilament yarn of 5 decitex or less provides a high bristle / high effect, and the pile surface feels soft and original soft. An excellent pile fabric that synergizes with the texture and exhibits a suede feeling can be obtained.

  In order to further reduce the single fiber fineness in terms of product development, one in the range of 0.55 to 1.1 dtex can be applied, which is preferable.

  Here, the polypropylene terephthalate polymer in the present invention is a polyester obtained using terephthalic acid as a main acid component and 1,3-propanediol as a main glycol component. However, it may contain a copolymer component capable of forming another ester bond at a ratio of 20 mol%, more preferably 10 mol% or less. Examples of the copolymerizable compound include dicarboxylic acids such as isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, sebacic acid, 5-sodium sulfoisophthalic acid, ethylene glycol, diethylene glycol, butanediol, neopentyl glycol, Although diols, such as cyclohexane dimethanol, polyethylene glycol, polypropylene glycol, can be mentioned, it is not limited to these. Further, if necessary, titanium dioxide as a matting agent, silica or alumina fine particles as a lubricant, hindered phenol derivatives, coloring pigments as an antioxidant may be added.

  In addition, the low-shrinkage component (low-viscosity component) is not particularly limited as long as it is a fiber-forming polyester that has good interfacial adhesion with a polypropylene terephthalate polymer, which is a high-shrinkage component, and has stable yarn-making properties. Although there are no mechanical properties, chemical properties and raw material prices, polyethylene terephthalate having excellent fiber forming ability is preferred.

  Polyethylene terephthalate is preferably a polyester obtained using terephthalic acid as the main acid component and ethylene glycol as the main glycol component. However, it is preferable that a copolymer component capable of forming another ester bond is contained in a proportion of 20 mol% or less, and more preferred is a component contained in a proportion of 10 mol% or less. Examples of copolymerizable compounds include sulfonic acid, sodium sulfonic acid, sulfuric acid, sulfate ester, diethyl sulfate, ethyl sulfate, aliphatic sulfonic acid, ethanesulfonic acid, chlorobenzene sulfonic acid, alicyclic sulfonic acid, isophthalic acid, sebacic acid Dicarboxylic acids such as azelaic acid, dimer acid, adipic acid, oxalic acid, decanedicarboxylic acid, hydroxycarboxylic acids such as p-hydroxybenzoic acid and ε-caprolactone, triethylene glycol, polyethylene glycol, propanediol, Diols such as butanediol, pentanediol, hydroquinone and bisphenol A are preferably used.

  If necessary, titanium dioxide as a matting agent, fine particles of silica or alumina as a lubricant, hindered phenol derivatives, coloring pigments as an antioxidant may be added.

Furthermore, the spinning of the core-sheath type structure of polypropylene terephthalate and polyethylene terephthalate polymer can utilize the concentric core-sheath composite type and the eccentric core-sheath composite type .
The yarn production technique may be any of the multistage set-high speed drawing method, that is, draw yarn formation by two steps of spinning and yarn production technology, and high orientation undrawn yarn formation by high speed spinning drawing method. Further, the cross-sectional shape may be an irregular cross-section other than that shown in the embodiment, and the same applies to the embodiment shown in FIG.

  Furthermore, when the single fiber fineness useful as a pile fabric is 0.55 dtex or more, both multifilaments and staples can be provided with stable quality.

  Next, the production method of the present invention will be described in detail.

  In the present invention, both a polypropylene terephthalate polymer and a polyester polymer are extruded from a spinneret having a core-sheath type composite structure by vacuum pressure, and then wound into an undrawn yarn while being drawn and then wound into a package. Next, undrawn yarn is drawn out from the package, and is drawn into yarn while being heated and drawn, and wound on a ring pun to obtain a finished fiber.

  Alternatively, both polymers are similarly extruded from a core-sheath composite structure spinneret by vacuum pressure, and then heated and drawn, and then taken up at a high speed of around 3000 m / min to form a highly oriented undrawn yarn. Wind up.

  By obtaining the highly oriented undrawn yarn, it is possible to produce Indow false twisting as well as draw yarn, so that a low-cost crimped yarn excellent in quality and processability can be produced.

  The draw yarn and indigo false twisted crimped yarn obtained by the above-described production method are developed into an interior material after being made into a napped or raised fabric for tricot, moquette or circular knitted pile fabric.

  In the present invention, the formation of staple filaments for spinning raw cotton is also applicable.

By forming a polypropylene terephthalate polymer and a poly ethylene terephthalate polymer sheath type composite structure of sheath / core, to stably concentric composite of a low shrinkage material was of high shrinking and poly ethylene terephthalate polypropylene terephthalate fiber Thus, the fiber polymer can be used in the direction of a polyester polymer that is safe and stable in terms of physical properties, and the improvement in light resistance and the properties and feeling can be utilized without deteriorating the characteristics of the polypropylene terephthalate polymer.

  Since the physical properties of the raw cotton can be stabilized by high strength, low elongation, and low shrinkage, the spinnability is improved and stable quality is ensured after cheese dyeing.

  In the fabric form, the use of spun yarn is particularly effective for moquette fabrics and double raschel fabrics, and by using a raised structure, the soft texture that is characteristic of the fibers can be drawn further, and the product field as a vehicle interior material The benefits of expanding are enormous.

  Hereinafter, the present invention will be described more specifically with reference to examples.

  In addition, the measurement method and sensory evaluation method of various characteristics described in the present invention are shown below.

[Intrinsic viscosity (IV)]
A sample of 1% by weight was dissolved in orthochlorophenol and measured with an Ubbelohde viscometer at 25 ° C.

[Strong elongation]
Based on JIS-L-0013 method and synthetic fiber filament tensile test method.

[Dry heat shrinkage]
Draw a draw yarn or crimped yarn and collect 5 rolls of 10 turns.

  After being allowed to stand for several hours, the length after 30 seconds is measured with a constant load of 0.1 g / 1.1 dtex and is defined as L1. Next, a dry heat temperature of 170 ° C. × 3 minutes was applied, and after sufficiently standing, the length after 30 seconds was measured with the same constant load to obtain L2.

  Dry heat shrinkage rate = [(L1−L2) / L1] × 100 (%). Calculated by an average value of five casks.

[Crimp elongation ratio]
Pull out the yarn, collect 5 casks of 10 turns, treat it at 98 ° C for 20 minutes and dry it thoroughly.

  The length after 30 seconds under a constant load of 0.1 g / 1.1 dtex is measured and set as L1. Next, after standing for 30 seconds, the length after 30 seconds is measured under an initial load of 2 mg / 1.1 dtex, and is defined as L2.

  Crimp elongation rate = [(L1−L2) / L2] × 100 (%). Calculated by the average value of 5 folds.

[Surface quality and napping]
Sensory judgment is made with a four-level evaluation (◎: Excellent grade, ○: Good, △: Slightly poor, ×: Poor) of the surface of the pile fabric visually covering and covering the feeling of napping. The results are shown as the average result of five skilled workers.

[Soft feeling]
The surface texture of the pile fabric is sensory-determined based on a four-step evaluation of “soft feeling to coarseness” (◎: soft feeling, ○; good, △; smoothness, x; coarseness), and 5 experts The average results are shown.

[Silky tone coloring]
Sense of surface gloss of pile fabric Sensory judgment based on four-level evaluation of “silky glossy to unsatisfactory” (◎; silky glossy, ○; same / good, Δ; polyester semi-dull, x; same / bright) And show the average result of five skilled workers.

[High temperature light fastness]
A pile fabric product (with urethane on the back) is subjected to continuous irradiation treatment at 83 ° C. for 300 hours by a fade meter method, and the surface discoloration is classified into 5 stages (5th grade; inconspicuous 4th grade; slightly noticeable, 3rd grade; Obvious but inconspicuous, grade 2; slightly noticeable, grade 1; very noticeable).

[Hair fall; white blur]
The pile fabric product is treated at 80 ° C. for 2 hours under a load of 4.9 N.

  There are 5 levels of weight marks immediately after dewetting (5th grade: inconspicuous, 4th grade; slightly noticeable, 3rd grade; recognized but inconspicuous, 2nd grade; slightly noticeable, 1st grade; very noticeable) Visual inspection is performed.

[Flat surface wear]
5 levels of wear state of the folded portion after 10,000 wears with a pressing load of 1 kg on a pile fabric product (5th grade; inconspicuous, 4th grade; slightly noticeable, 3rd grade; recognized but inconspicuous, 2nd grade; Slightly conspicuous, 1st grade;

[Taper wear]
Observe surface wear after piled up to 500g, 1000 times on pile fabric product, 5 levels (5th grade; inconspicuous, 4th grade; slightly noticeable, 3rd grade; recognized but inconspicuous, 2nd grade; slightly noticeable First grade; very conspicuous).

[Example 1]
As the sheath / core form, the sheath is a polypropylene terephthalate homopolymer having an intrinsic viscosity (IV) of 1.18, and the ratio is 70% by weight. The core is a polyethylene terephthalate homopolymer having an intrinsic viscosity (IV) of 0.60, and the ratio is 30% by weight.

  Each melted separately at a spinning temperature of 280 ° C, discharged from a 72-hole sheath / core composite spinneret with the same fiber cross-sectional shape as shown in Fig. 1 (2), and the same core shape, and drawn at a spinning speed of 2500 m / min. A highly oriented undrawn yarn of 118 dtex (decitex) -72 fil (filament) was obtained.

  Furthermore, using a drawing machine equipped with a hot roll-hot plate set, the drawing was performed at a hot roll temperature of 85 ° C., a hot plate temperature of 145 ° C., and a draw ratio of 1.40 times to produce an 84 dtex-72 fil drawer yarn.

  The physical properties of the drawer yarn were as follows: strength 3.4 cN / dtex, elongation 38%, dry heat shrinkage 6.4%.

  A composite pile yarn having a polypropylene terephthalate polymer arranged on the sheath side is used as a pile yarn, and a polyester 84 dtex-24fil yarn is used as a ground yarn. A cut pile fabric having a pile length of 2.5 mm is knitted by a 22 gauge tricot machine. did.

  The resulting pile fabric exhibits the unique soft feel and texture, which is characteristic of polypropylene terephthalate fibers, and sufficiently exhibits silky color development, improving the light fastness that is important for the quality of automobile interior pile fabrics. The class was secured. It was a high-quality product with excellent napping properties, wear durability and anti-hair fall resistance.

[ Reference Example 2 ]
The sheath / core form is the elliptical octalobe form shown in FIG. 2 (2), the ratio of the polyethylene terephthalate polymer on the sheath side is 50% by weight, and the core is a polypropylene terephthalate polymer having the same ratio and an elliptical form. The structure is arranged. The intrinsic viscosities are the same as in Example 1.

  In the same manner as in Example 1, both polymers were subjected to a spinning-drawing-winding step to obtain a highly oriented undrawn yarn. Furthermore, 86 dtex-48 fil drawer yarn was produced through the same process. The physical properties of the drawer yarn were as follows: strength 3.7 cN / dtex, elongation 34%, dry heat shrinkage 6.1%.

  A tricot knitted cut pile fabric was obtained in the same manner as in Example 1, using the sheath / core composite drawer yarn having a polypropylene terephthalate polymer arranged on the core side as a pile yarn.

  The obtained pile fabric sufficiently exhibited the unique soft touch and texture and silky color development characteristic of polypropylene terephthalate fiber, and secured light resistance of 3 or more. Naturally, the inferiority of polypropylene terephthalate fiber, which can be improved, can be improved, and the quality of the suede-like sensation can be improved.

[Example 3]
A highly oriented unstretched yarn of 236 dtex-72 fil having a sheath / core elliptical structure having the same cross-sectional shape as in Example 1 and a doubled fineness was produced. Next, a low crimped yarn of 168 dtex-72 fil under the conditions of 1.42 times stretching by the Indo second secondary set false twisting method, false twist number 2240 t / m, false twist primary / secondary set temperature 165/160 ° C. It was.

  The properties of the obtained low crimped yarn were such that the strength was 3.3 cN / dtex, the elongation was 35%, the dry heat shrinkage was 5.7%, and the crimp elongation was 6.6%. It was.

  In order to make the sheath / core composite low crimped yarn into a pile yarn development of moquette, soft wound package dyeing was performed by a dyeing method of disperse dye-based polyester fibers. In order to emphasize silky and high-quality tone expression, yarns with different dye hues were twisted and processed into pile yarns. The pile yarn was woven into a moquette fabric having a polyester / rayon blend yarn, a driving density of 170 pieces / 10 cm, and a cut length of 2.7 mm.

  The resulting pile fabric is a polypropylene fiber terephthalate fiber and has a unique soft touch and texture, excellent color development and tone expression due to the effect of crimping. It was possible to obtain high-quality products with improved light resistance and covering properties, as well as excellent napping properties, wear durability, and hair fall resistance.

[Example 4]
The sheath / core form is a round concentric form shown in FIG. 1 (1), the ratio of the sheath side polypropylene terephthalate polymer is 50% by weight, and the core is the same type cross-sectional form and the same ratio. The structure is arranged. The intrinsic viscosities are the same as in Example 1.

  An unstretched tow of 3500 thousand dtex was obtained through a spinning process in which concentric composite fibers were discharged from a 500,000-hole base. Further, the unstretched tow was stretched by about 3.2 times to produce staple fiber raw cotton having a single yarn fineness of 2.2 dtex, a crimp number of 12 / 2.54 cm, and a cut length of 51 mm. The properties of the single yarn fiber of the raw cotton were such that the strength was 3.3 cN / dtex, the elongation was 47%, and the dry heat shrinkage was 6.7%.

  Further, the raw cotton was subjected to the same card-strand-spinning process as that of the polyester fiber to obtain a twisted yarn K = 3.2 and 30th spun yarn. In addition, the passability in the spinning production process was also good, and it was in a situation comparable to the processability of the polyester fiber. In order to make a moquette fabric using the spun yarn, the spun yarn was softly wound, packaged and dyed to have a tone color difference, and then two yarns were twisted into a pile yarn. In addition, as a result of performing the package dyeing, a dyed yarn having a stable quality was obtained with a small shrinkage difference between the cheese inner and outer layers.

  Production of the moquette fabric was carried out in the same manner as in Example 3.

  The resulting pile fabric exhibited the unique soft feel and texture and silky color development characteristic of polypropylene terephthalate fibers, despite the round cross section, and secured light resistance of grade 3-4. . Moreover, it was of a quality with an excellent soft feeling that can improve the inferiority of the polypropylene terephthalate fiber, which is the napping property, abrasion resistance, and white blurring.

[ Reference Example 5 ]
A highly oriented undrawn yarn 125 dtex-48 fil of a side-by-side composite structure (FIG. 3) bonded in the center part in an elliptical eight-leaf form using 50% by weight of each polymer of Example 1 was produced.

  Next, low crimped yarn of 84 dtex-48 fil under the conditions of 1.52 times stretching by Indolaw secondary set false twisting method, false twist number 2000 t / m, false twist primary / secondary set temperature 165/160 ° C I was spoiled. The physical properties of the low crimped yarn obtained are as follows: strength 3.5 cN / dtex, elongation 38.7%, dry heat shrinkage 6.3%, and crimp elongation 15.2%. there were.

  The side-by-side composite low crimped yarn was cut into a pile fabric having a pile length of 2.5 mm by tricot knitting as in Example 1.

  The obtained pile fabric was superior in the coil crimping property potentially possessed by the side-by-side composite structure, and although the false twist crimp was imparted, the pile fiber was greatly shrunk and the nap feeling was slightly inferior.

[Comparative Example 1]
Only the polypropylene terephthalate homopolymer of Example 1 was melted at a spinning temperature of 280 ° C., discharged from a 48-hole spinneret with an elliptical eight-leaf cross-section, and taken up at a spinning speed of 2500 m / min and highly oriented unstretched at 118 dtex-48 fil. I got a thread. Further, the same process as in Example 1 and some of the conditions were changed, and an 84 dtex-48 fil drawer yarn was produced.

  The physical properties of the drawer yarn were as follows: strength 2.8 cN / dtex, elongation 43%, dry heat shrinkage 11.4%. Similarly to Example 1, the fabric was a tricot knitted cut pile fabric with a pile length of 2.5 mm.

  The obtained pile fabric sufficiently exhibited the unique soft feel and texture characteristic of homopolypropylene terephthalate fibers.

  However, the light resistance required for automobile interior materials having a high performance target is a low level of 1st grade or less. Further, the napping properties, wear durability, and resistance to falling down cannot be sufficiently cleared, and the quality of the present invention has not been overcome.

[Comparative Example 2]
A highly oriented unstretched yarn of 265 dtex-72 fil having an elliptical eight-leaf cross section was produced by using only the polyethylene terephthalate homopolymer of Example 1 at a high speed spinning method of 3000 m / min. Next, a low crimped yarn of 170 dtex-72 fil under the conditions of 1.63 times stretching by Indo-low secondary set false twisting method, false twist number 2240t / m, false twist primary / secondary set temperature 185/180 ° C It was. The properties of the obtained low crimped yarn were such that the strength was 4.1 cN / dtex, the elongation was 32%, and the dry heat shrinkage was 3.7%.

  In order to use the crimped yarn for developing a pile yarn of a moquette, a moquette fabric was obtained by partially changing the same processes and conditions as in Example 3.

  Although the obtained pile fabric has the characteristics of an elliptical lobe and is excellent in soft touch and covering property, it does not have a unique soft feeling as seen in Examples 3 and 4 in terms of texture.

  Polyethylene terephthalate fiber has excellent performance and properties, but it has various cross-sectional shapes to meet the requirements of the interior material field, and further improvements to fine-multi-technology have been made. We are pursuing without getting bored. However, the original temperament of the fiber does not change.

  Therefore, the soft feel and texture of the unique temperament possessed by polypropylene terephthalate fibers have been attracting attention from the background momentum, and the present invention obtains the advanced performance, characteristics and texture required by the interior material field. This makes it easy to develop products and is expected to become a material for building a field.

  Table 1 shows the composition of the raw yarn used in the present invention and the characteristics of the pile yarn.

本発明のパイル布帛の評価特性を表２に示した。

The evaluation characteristics of the pile fabric of the present invention are shown in Table 2.

It is sectional drawing which shows an example of the composite fiber structure of the sheath which concerns on this invention; Polypropylene terephthalate / core; Polyester polymer. It is sectional drawing which shows an example of the composite fiber structure of the sheath which concerns on this invention; Polyester / core; Polypropylene terephthalate polymer. It is sectional drawing which shows an example of the side-by-side type | mold composite fiber structure of the polypropylene terephthalate which concerns on this invention, and a polyester polymer.

Explanation of symbols

A: Polypropylene terephthalate polymer B: Polyester polymer

Claims (5)

Sheath component of the fiber outer surface is composed of 99 to 50 wt% of polypropylene terephthalate polymer has a concentric core-sheath structure core component is a composite fiber composed of polyester-based polymer of 1 to 50% by weight, the single fiber fineness of the composite fiber Ri der 5 dtex or less, and the pile fibers hair falling property is characterized der Rukoto tertiary or higher. The pile fiber according to claim 1, wherein the composite fiber has an irregular cross-sectional shape. Pile fabric characterized by comprising using the pile fibers according to claim 1 or 2. A pile fabric, wherein the composite fiber having the irregular cross-sectional shape according to claim 2 is used as a pile fiber, and the light resistance performance is grade 3 or higher. The pile fabric according to claim 3 or 4 , wherein the pile fabric is used for a vehicle.

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