CN100519873C - Nonwoven fabric made of core sheath type composite fiber and process for producing the same - Google Patents

Nonwoven fabric made of core sheath type composite fiber and process for producing the same Download PDF

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Publication number
CN100519873C
CN100519873C CNB2003801014637A CN200380101463A CN100519873C CN 100519873 C CN100519873 C CN 100519873C CN B2003801014637 A CNB2003801014637 A CN B2003801014637A CN 200380101463 A CN200380101463 A CN 200380101463A CN 100519873 C CN100519873 C CN 100519873C
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China
Prior art keywords
core
polyethylene
nonwoven fabric
sheath
fiber
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CNB2003801014637A
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Chinese (zh)
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CN1705782A (en
Inventor
木原幸弘
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Unitika Ltd
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Unitika Ltd
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
    • D04H3/147—Composite yarns or filaments
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
    • D01D5/30—Conjugate filaments; Spinnerette packs therefor
    • D01D5/34—Core-skin structure; Spinnerette packs therefor
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/06—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyolefin as constituent
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/005—Synthetic yarns or filaments
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/608—Including strand or fiber material which is of specific structural definition
    • Y10T442/609—Cross-sectional configuration of strand or fiber material is specified
    • Y10T442/61—Cross-sectional configuration varies longitudinally along strand or fiber material

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Multicomponent Fibers (AREA)

Abstract

A nonwoven fabric comprising core/sheath type long composite fibers as constituent fibers. The core comprises a polyester and the sheath comprises polyethylene. The polyethylene constituting the sheath preferably is a mixture of a first polyethylene obtained with a metallocene polymerization catalyst with a second polyethylene obtained with a Ziegler-Natta polymerization catalyst. The cross-sectional shape of the core does not substantially change in the axial direction of the fiber and the core has an even diameter. On the other hand, the thickness of the sheath is uneven in the axial and peripheral directions of the fiber and varies irregularly. The sheath hence has irregular recesses and protrusions. Consequently, the nonwoven fabric made of the core/sheath type long composite fibers is rich in flexibility.

Description

Nonwoven fabric and manufacture method thereof that core sheath shape composite fibre constitutes
Technical field
The present invention relates to a kind of with special core sheath shape composite fibre as constituting fiber, flexibility is excellent and heat seal is also excellent nonwoven fabric and manufacture method thereof.
Background technology
In the past, known a kind of with the nonwoven fabric of core-sheath-type composite fibre as the formation fiber.Particularly, as the heat seal nonwoven fabric, known core is made of polyester and nonwoven fabric (Japan's special fair 8-14069 communique (the 1st page, claim 1)) that core-sheath-type composite fibre that sheath portion is made of polyethylene constitutes.Promptly, this heat seal nonwoven fabric is owing to be that sheath portion is made up of the core-sheath-type composite fibre that the polyethylene that hangs down melting point constitutes core by the polyester of high melting point, with lamination, heating such as this nonwoven fabric and other base materials with when pressurizeing as required, softening or the fusion of the polyethylene of sheath portion, and other base materials carry out heat bonding.
Summary of the invention
The inventor has carried out reducing the research of poly melting point in order to improve the thermal bonding of above-mentioned heat seal nonwoven fabric.In research process, when the inventor adopts specific polyethylene,, find to obtain the different product of its form for typical core-sheath-type composite fibre in the past.That is, find to obtain to have irregular concavo-convex composite long fiber on the surface (surface that is called sheath portion) of core-sheath-type composite fibre.And so its fibre diameter of composite long fiber not necessarily and exist thin position and thicker part position because of existing carefully position, distinguishes that it also is rich in flexibility.Therefore, composite long fiber like this also is rich in flexibility as the nonwoven fabric that constitutes fiber.As from the foregoing, the technical problem to be solved in the present invention provides the excellent nonwoven fabric of a kind of flexibility.And,, adopted following formation in order to solve the problems of the technologies described above.
Promptly, being characterized as of nonwoven fabric of the present invention, core is made of polyester and sheath portion by polyethylene constitute, the transverse shape of core fiber axis to do not change in fact, the thickness of sheath portion at fiber axis to the core sheath shape composite fibre of and change at random circumferentially inhomogeneous with fiber as constituting fiber.
Description of drawings
Fig. 1 is the side view (microphotograph) that an example of core sheath shape composite fibre of the present invention is shown,
Fig. 2 illustrates another routine side view (microphotograph) of core sheath shape composite fibre of the present invention,
Fig. 3 is the side view (microphotograph) that the another example of core sheath shape composite fibre of the present invention is shown,
Fig. 4 is the enlarged drawing (electron micrograph) by the nonwoven fabric of long fibers surface of the method acquisition of following embodiment 2,
Fig. 5 is the enlarged drawing (electron micrograph) by the nonwoven fabric of long fibers surface of the method acquisition of following embodiment 3,
Fig. 6 is the enlarged drawing (electron micrograph) by the nonwoven fabric of long fibers surface of the method acquisition of following embodiment 4,
Fig. 7 is the enlarged drawing (electron micrograph) by the nonwoven fabric of long fibers surface of the method acquisition of following embodiment 5,
Fig. 8 is the routine cross-sectional view (microphotograph) that core sheath shape composite fibre of the present invention is shown.
The specific embodiment
Nonwoven fabric of the present invention is, with specific core sheath shape composite fibre as constituting fiber.Core sheath shape composite fibre can be that staple fibre also can be a long fiber, but in the present invention, is applicable to the product that is obtained nonwoven fabric by spun-bond process, therefore preferably than long fiber.Core sheath shape composite fibre is that core is made of polyester and sheath portion is made of polyethylene.Polyester and poly intermiscibility and even compatibility are because of suitably bad, can obtain special core sheath shape composite fibre therefore, except polyester, under situation about using with the excellent polypropylene of poly compatibility and even compatibility etc., be difficult to obtain special core sheath shape composite fibre as core.In addition, though use beyond the polyester with the bad polyamide of polyethylene compatibility and even compatibility etc., also be difficult to obtain special core sheath shape composite fibre.
The transverse shape of core is same, at fiber axis to not changing in fact. be typically, even core is taked cross section arbitrarily, it is circular that its shape also is preferably. in addition. as the polyester that constitutes core, can utilize usually in the poly terephthalic acid ethylene glycol that uses in commercially available or industrial particularly as use commercially available of fiber and the product that utilizes.Particularly, best operating limit viscosity is 0.50～1.20 poly terephthalic acid ethylene glycol.
The surface of core sheath shape composite fibre is that the surface of sheath portion becomes irregular concavo-convex.This irregular concavo-convex thickness by sheath portion presents to and change at random circumferential inhomogeneous with fiber at fiber axis.At this,,, also comprise thickness and be zero situation even be the position that core exposes for the non-existent position of sheath portion for the thickness of sheath portion.Therefore, the fibre diameter of core sheath shape composite fibre is that the thickness of φ 0, sheath portion is that the fibre diameter at maximum position is when being φ 1 at the diameter of core. fiber axis to, in the scope of φ 0～φ 1, change randomly.In addition, the radius of core be the thickness of (φ 0/2), sheath portion be the fiber radius at maximum position when (φ 1/2), circumferential at fiber, the fiber radius of core sheath shape composite fibre is change at random in the scope of (φ 0/2)～(φ 1/2).In addition,, the cross section of core and core sheath shape composite fibre is illustrated for circular occasion, also can not but its cross section is not a circle at this.When the cross section of core and core sheath shape composite fibre was non-circular, the fibre diameter of the diameter of core or core sheath shape composite fibre may be interpreted as and corresponding imaginary diameter of a circle of its cross sectional area or fibre diameter.
The polyethylene that constitutes sheath portion preferably uses the second poly mixture of first good polyethylene of spinnability and spinnability difference.When only using good first polyethylene of spinnability, sheath portion surface is difficult to present irregular concavo-convex.That is, become the same form of typical core sheath shape composite fibre with surperficial no concave-convex easily. in addition, when only using second polyethylene of spinnability difference, be difficult to obtain core sheath shape composite fibre by melt spinning method.First polyethylene and the second poly blending ratio be first polyethylene preferably: second polyethylene=30～70:70～30 (weight %). as first polyethylene, preferably adopting by metallocene is that this polyethylene of polyethylene that polymerization catalyst obtains is low melting point, and the excellent material of spinnability.As second polyethylene, adopting the polyethylene of common industrial utilization is the polyethylene that polymerization catalyst obtains by Z-N promptly.Wherein, preferably the low density polyethylene (LDPE), particularly density of poor, the low melting point of spinnability are 0.910～0.925 low density polyethylene (LDPE).
Preferably relative core 100 weight portions of the weight ratio of core and sheath portion, sheath portion is 20～300 weight portions.Core sheath shape composite fibre of the present invention since the thickness of sheath portion fiber axis to the circumferential inhomogeneous and change at random of fiber, its weight ratio means the weight ratio of core sheath shape composite fibre in all.Sheath portion is during less than 20 weight portions, during heat bonding composition when sheath portion becomes heat seal, is difficult to obtain sufficient adhesion strength.When sheath portion surpassed 300 weight portions, the core amount tailed off relatively, the variation in diameter of core, and it is that the fibre strength (brute force) at the position of exposing in full week of core reduces that the owing of sheath portion decreased the position.
The fiber number of core sheath shape composite fibre of the present invention is preferably about 1.0～10dTex.The fiber number of core sheath shape composite fibre of the present invention to because inhomogeneous and change at random, means core sheath shape composite fibre all average fineness in this fiber number at fiber axis.
The concrete example of the shape of core sheath shape composite fibre of the present invention such as Fig. 1～shown in Figure 3.Two parallel straight lines are represented the side of core.Therefore, the transverse shape of core at fiber axis to not changing.And, two straight lines that this is parallel be in or under the protuberance as knurl represent sheath portion.As diagram as can be known, the thickness of sheath portion fiber axis to the circumferential inhomogeneous and change at random of fiber.In addition, Fig. 8 illustrates the concrete example of the transverse shape of core sheath shape composite fibre of the present invention, among this figure also as can be known the thickness of sheath portion in the circumferential inhomogeneous and change at random of fiber.
Can be arbitrarily with core sheath shape composite fibre of the present invention as the basic weight of the nonwoven fabric that constitutes fiber, but is preferably 10～100g/m 2About.This nonwoven fabric by with between this nonwoven fabric mutually lamination, make its ora terminalis heat seal, but the pouch thing.In addition, this nonwoven fabric also can form composite by heat-seal bond with the other materials of synthetic resin made membrane, braided fabric, paper or other nonwoven fabric etc.That is, can apply heat and desirable pressure, make its softening or fusion by polyethylene to the sheath portion that constitutes core sheath shape composite fibre, and make this nonwoven fabric mutual or with the other materials heat bonding.Particularly, the sheath portion of core sheath shape composite fibre of the present invention becomes when being the mixture of the polyethylene that obtains of polymerization catalyst and low density polyethylene (LDPE) by metallocene, the melting point step-down of sheath portion, heat bonding at a lower temperature.In addition, particularly during the polyolefin film, better as other materials with the compatibility of the sheath portion that constitutes by polyethylene at the material that uses polyolefin, can realize high-adhesive-strength.In addition, even the time with the polyethylene film heat bonding, also have this polyethylene film be difficult under the heat affecting shrink, the advantage of distortion or distortion etc.
Below, the manufacture method of core sheath shape composite fibre of the present invention as the nonwoven fabric that constitutes fiber described.Being characterized as of the manufacture method of the conduct representative of nonwoven fabric of the present invention, with polyester with to make by metallocene be that this polyethylene is configured to the mode of sheath to the polyethylene that mixes with second polyethylene that is the polymerization catalyst acquisition of first polyethylene that polymerization catalyst obtains so that this polyester is configured to core by Z-N, supply with to core-sheath-type composite spinning hole, with the core sheath shape long fiber aggregation of melt spinning acquisition.Promptly, resin as the core that constitutes core sheath shape composite fibre, adopt polyester, and as the resin that constitutes sheath portion, employing will be the polyethylene that first polyethylene that polymerization catalyst obtains mixes with second polyethylene that is the polymerization catalyst acquisition by Z-N by metallocene, by adopting the spun-bond process of known in the past core-sheath-type composite molten spin processes, obtain nonwoven fabric of long fibers.
As polyester, be first polyethylene that obtains of polymerization catalyst, be second polyethylene that polymerization catalyst obtains, can adopt aforesaid material by Z-N by metallocene.First polyethylene and second polyethylene evenly mix by aforesaid weight rate, use as polyethylene.Poly melt flow ratio (MFR) is preferably 16～21g/10 branch.Be under the situation in this scope,, also form the surface easily and become irregular concavo-convex sheath portion even when high speed spinning.In addition, faster by making spinning speed when the numerical value of MFR is big even be in outside this scope, and at the numerical value of MFR hour, slower by making spinning speed, can obtain the surface and become irregular concavo-convex sheath portion., when the spinning speed that adopts usually was the spinning speed of 3000～4000m/ branch, MFR was preferably in the above-mentioned scope.In addition, poly melting point is preferably lower, and good especially is about 90～110 ℃.Because of under lower temperature, just realizing heat seal.
Heat respectively and fusion for polyester and polyethylene, polyester is configured to be arranged at the core in a plurality of core-sheath-type composite spinnings hole in the spinning head, and polyethylene is configured to sheath.And, as be melt spinning, can obtain many surfaces has irregular concavo-convex core sheath shape composite long fiber.In the present invention, can stably obtain the surface and have the advantages that irregular concavo-convex core sheath shape composite long fiber should be maximum.That is, the surface have irregular concavo-convex at fiber axis to the fibre diameter difference.Even obtain long fiber like this by melt spinning method, cut off long fiber at the thinner position of fibre diameter in the past, can not obtain stable long fiber.That is, in melt spinning method in the past, fiber surface forms when concavo-convex, the good position of resin flow after spinning just,, its good fluidity concavo-convex because of forming, but more concentrated at the thinner recess stress of fibre diameter, cut off easily at recess, can not obtain stable long fiber.And according to the present invention, at fiber axis to can stably obtaining the different long fiber of fibre diameter.The inventor is explained as follows its principle.Promptly be interpreted as: when under resin of the present invention is formed, carrying out the composite molten spinning, the good position of Resin Flow after spinning just, the spinning fibre surface does not form concavo-convex, after this moment of solidifying with core simultaneously or afterwards, the polyethylene that constitutes sheath portion deforms, and produces irregular concavo-convex.In addition, the reason that polyethylene deforms is interpreted as, and because of second polyethylene of good first polyethylene of spinnability and spinnability difference mixes, first polyethylene and core together are convenient to fiber and are formed, but second polyethylene hinders fiber formation.
As above-mentioned, obtain core sheath shape composite long fiber after, with its capture and accumulate in on its conveyer that moves.After the gathering, by knurling rolls etc., part is carried out thermo-compressed, and the softening or fusion sheath portion at the crimping position with the mutual combination of core sheath shape composite long fiber, obtains the nonwoven fabric with desirable TENSILE STRENGTH.
With core sheath shape composite fibre of the present invention as the nonwoven fabric that constitutes fiber as aforementioned, be applicable to the purposes that forms composite with other materials by heat-seal bond.In addition, be applicable to the purposes that the mutual lamination of this nonwoven fabric and its ora terminalis heat seal is formed satchel.In addition, with in the past nonwoven fabric similarly, also be applicable to the purposes of dress material material, hygienic material, general industry material, Agricultural Materials, life material etc.
As above-mentioned, nonwoven fabric of the present invention constitutes fiber as it, by the transverse shape of core at fiber axis to not changing in fact, and the thickness of sheath portion constitutes at the core sheath shape composite fibre of fiber axis to and change at random circumferentially inhomogeneous with fiber.That is, be as the core sheath shape composite fibre that constitutes fiber, its fibre diameter at fiber axis to attenuating or chap.Existence because of the thin position of this fibre diameter gives core sheath shape composite fibre flexibility.In addition, to being used to become the uniform fibers diameter, the TENSILE STRENGTH of core sheath shape composite fibre has identical degree with core-sheath-type composite fibre in the past to core at fiber axis.Therefore, core sheath shape composite fibre like this had the also excellent effect of the excellent while flexibility of TENSILE STRENGTH as the nonwoven fabric that constitutes fiber.
In addition, nonwoven fabric reason of the present invention surface has irregular concavo-convex core sheath shape composite fibre and constitutes, and makes light at random well.Therefore, nonwoven fabric of the present invention also has the excellent effect of whiteness.
In nonwoven fabric of the present invention, polyethylene as the sheath portion that constitutes core sheath shape composite fibre, employing will be that first polyethylene of the low melting point that obtains of polymerization catalyst is when mixing the mixture of low density polyethylene (LDPE) particularly with second polyethylene that is the low melting point of polymerization catalyst acquisition by Z-N by metallocene, can carry out heat seal at a lower temperature, have the effect that can realize the thermo-compressed under the low temperature.
In addition, in the manufacture method of nonwoven fabric of the present invention, the polyethylene that sheath portion uses the second poly mixture of first good polyethylene of spinnability and spinnability difference to constitute.When using so poly melt spinning, when forming sheath by second polyethylene of spinnability difference, the thickness of sheath is thickening or attenuation at random.In addition, core uses polyester, carries out uniform melt spinning samely.Therefore, the transverse shape of core at fiber axis to not changing in fact, the thickness of sheath portion fiber axis to fiber circumferentially inhomogeneous and core sheath shape composite fibre change at random have and can stably obtain and it also can be stablized the effect that reasonably obtains as the nonwoven fabric that constitutes fiber.
Embodiment
Below, according to embodiment the present invention is described, but the present invention is not limited to embodiment.The present invention is in the melt spinning method of in the past core-sheath-type composite long fiber, when using specific polyethylene, be that the surface of sheath portion has the explanation that discovery that irregular concavo-convex composite long fiber can stably obtain has been done based on the surface of core-sheath-type composite long fiber as polyethylene.
Each characteristic value among the embodiment is obtained by following.
(1) limiting viscosity of polyester " η "; Phenol and ethylene tetrachloride etc. dissolve 0.5g among the weight mixed solvent 100cc, under the condition of temperature 20%, measure.
(2) melting point (℃); Using the differential scanning calorimetry DSC-7 type of パ-キ Application エ Le マ-society's system, is to measure under 20 ℃/minute at programming rate.
(3) poly melt flow ratio (g/10 branch); By the method for JIS K 6922 records, under the condition that 190 ℃ of following loads of temperature are 21.18N, measure.
(4) flexibility of nonwoven fabric (g); Elasticity, E method, feel measuring appliance method by JIS L 1096 records are measured.
(5) soft feeling of nonwoven fabric; 5 participants pass through feel, between the nonwoven fabric of embodiment and comparative example, and the following soft feeling of relatively estimating.
1: softness
2: soft slightly
3: hard
(6) the smooth sense of nonwoven fabric; 5 participants are by feel, between the nonwoven fabric of embodiment and comparative example, followingly relatively estimate smooth sense.
Greatly: smooth sense is remarkable
In: have smooth sense
Little: smooth sense is not remarkable
(7) TENSILE STRENGTH of nonwoven fabric (N/5cm width); According to synthetic fiber nonwoven fabric of long fibers test method(s) (JIS L1906), use Japan ボ-system テ of Le De ウ イ Application society Application シ ロ Application RTM-500 type, to be spaced apart 100mm, draw speed be that to measure width under the 100mm/ condition of dividing be that 50mm, length are the test film of 200mm controlling, obtain the mean value of 10 of test films, be used as TENSILE STRENGTH.In addition, for TENSILE STRENGTH, obtain the MD direction (operating direction) of nonwoven fabric and the TENSILE STRENGTH on this both direction of CD direction (perpendicular to the direction of MD direction).
(8) heat-seal strength of nonwoven fabric (N); With 2 pieces of coincidences of test film of 30mm (CD direction) * 150mm (MD direction), with the front end 50mm place of heat seal exerciser hot pressing apart from length direction (MD direction).In the thermo-compressed, the temperature of mould is set at 100 ℃, 110 ℃ and 130 ℃ of these three kinds of temperature, face is pressed and is 98N/cm 2Down, bond area 10mm (MD direction) * 30mm (CD direction).
The heat-seal strength of thermo-compressed portion is peeled off determination method according to the T of JIS L 1089, use Japan ボ-system テ of Le De ウ イ Application society Application シ ロ Application RTM-500 type, to be spaced apart 10mm, draw speed be that to measure width under the 100mm/ condition of dividing be the test film of 30mm controlling, and obtains the mean value of 5 of test films.
Embodiment 1
Prepare limiting viscosity " η " and be 0.70, melting point is 260 ℃ poly terephthalic acid ethylene glycol.In addition, preparing the melt flow ratio is that 18g/10 branch, density are that 0.911g/cc, melting point are 104 ℃ polyethylene.This polyethylene is for being that melt flow ratio that polymerization catalyst obtains is that 28g/10 branch, density are that 0.906g/cc, melting point are 97 ℃ first polyethylene that accounts for 60 weight portions and be that the melt flow ratio that polymerization catalyst obtains is that 4g/10 branch, density are that 0.918g/cc, melting point are 106 ℃ the second poly mixture that accounts for 40 weight portions by Z-N by metallocene.
And, be disposed at the mode of sheath and make both weight portion ground such as become and supply with polyester is disposed at core, polyethylene to core-sheath-type composite spinning hole, be that 280 ℃, spinning speed are to carry out melt spinning under 3800m/ divides at spinning temperature.Behind the melt spinning, by suction device traction refinement, will open fibre from the strand group that suction device is discharged after, on the collection face that moves, assemble core sheath shape composite long fiber (fiber number is 3.3dTex), with the acquisition bondedfibre fabric.It is the heat embossing device of 95 ℃ knurling rolls (area occupation ratio of protuberance is 36%) and the surface temperature plain-barreled roll formation that is 95 ℃ that this bondedfibre fabric is imported by surface temperature, at line pressure is under the condition of 294N/cm, part is implemented thermo-compressed and is handled, and is 50g/m to obtain basic weight 2Nonwoven fabric of long fibers.
Embodiment 2
Prepare limiting viscosity " η " and be 0.70, melting point is 260 ℃ poly terephthalic acid ethylene glycol.In addition, preparing the melt flow ratio is that 21g/10 branch, density are that 0.913g/cc, melting point are 102 ℃ polyethylene.This polyethylene is for being that melt flow ratio that polymerization catalyst obtains is that 28g/10 branch, density are that 0.906g/cc, melting point are 97 ℃ first polyethylene that accounts for 60 weight portions and be that the melt flow ratio that polymerization catalyst obtains is that 14g/10 branch, density are that 0.918g/cc, melting point are 106 ℃ the second poly mixture that accounts for 40 weight portions by Z-N by metallocene.
Use this polyester and polyethylene, obtaining basic weight with similarly to Example 1 method is 50g/m 2Nonwoven fabric of long fibers.
Embodiment 3
Prepare limiting viscosity " η " and be 0.70, melting point is 260 ℃ poly terephthalic acid ethylene glycol.In addition, preparing the melt flow ratio is that 18g/10 branch, density are that 0.913g/cc, melting point are 104 ℃ polyethylene.This polyethylene is for being that melt flow ratio that polymerization catalyst obtains is that 28g/10 branch, density are that 0.906g/cc, melting point are 97 ℃ first polyethylene that accounts for 40 weight portions and be that the melt flow ratio that polymerization catalyst obtains is that 14g/10 branch, density are that 0.918g/cc, melting point are 106 ℃ the second poly mixture that accounts for 60 weight portions by Z-N by metallocene.
Use this polyester and polyethylene, obtaining basic weight with similarly to Example 1 method is 50g/m 2Nonwoven fabric of long fibers.
Embodiment 4
Prepare limiting viscosity " η " and be 0.70, melting point is 260 ℃ poly terephthalic acid ethylene glycol.In addition, preparing the melt flow ratio is that 16g/10 branch, density are that 0.910g/cc, melting point are 103 ℃ polyethylene.This polyethylene is for being that melt flow ratio that polymerization catalyst obtains is that 28g/10 branch, density are that 0.906g/cc, melting point are 97 ℃ first polyethylene that accounts for 67 weight portions and be that the melt flow ratio that polymerization catalyst obtains is that 4g/10 branch, density are that 0.918g/cc, melting point are 106 ℃ the second poly mixture that accounts for 33 weight portions by Z-N by metallocene.
Use this polyester and polyethylene, obtaining basic weight with similarly to Example 1 method is 50g/m 2Nonwoven fabric of long fibers.
Embodiment 5
Prepare limiting viscosity " η " and be 0.70, melting point is 260 ℃ poly terephthalic acid ethylene glycol.In addition, preparing the melt flow ratio is that 22g/10 branch, density are that 0.909g/cc, melting point are 103 ℃ polyethylene.This polyethylene is for being that melt flow ratio that polymerization catalyst obtains is that 28g/10 branch, density are that 0.906g/cc, melting point are 97 ℃ first polyethylene that accounts for 70 weight portions and be that the melt flow ratio that polymerization catalyst obtains is that 14g/10 branch, density are that 0.918g/cc, melting point are 106 ℃ the second poly mixture that accounts for 30 weight portions by Z-N by metallocene.
Use this polyester and polyethylene, obtaining basic weight with similarly to Example 1 method is 50g/m 2Nonwoven fabric of long fibers.
Comparative example 1
Prepare limiting viscosity " η " and be 0.70, melting point is 260 ℃ poly terephthalic acid ethylene glycol.In addition, preparing the melt flow ratio is that 25g/10 branch, density are that 0.957g/cc, melting point are 130 ℃ high density polyethylene (HDPE).This high density polyethylene (HDPE) is for being that polymerization catalyst obtains by Z-N.
Use this polyester and polyethylene, obtaining basic weight with similarly to Example 1 method is 50g/m 2Nonwoven fabric of long fibers.
Flexibility, soft feeling, smooth sense, TENSILE STRENGTH and the heat-seal strength of each nonwoven fabric of long fibers that the method for employing embodiment 1～5 and comparative example 1 obtains measured by above-mentioned method, and its result is by table 1 illustrate.
[table 1]
Figure C200380101463D00141
In addition, Fig. 4 shows the electron micrograph by the nonwoven fabric of long fibers surface of the method acquisition of embodiment 2, Fig. 5 shows the electron micrograph by the nonwoven fabric of long fibers surface of the method acquisition of embodiment 3, Fig. 6 shows the electron micrograph by the nonwoven fabric of long fibers surface of the method acquisition of embodiment 4, and Fig. 7 shows the electron micrograph by the nonwoven fabric of long fibers surface of the method acquisition of embodiment 5.
In the nonwoven fabric of long fibers that is obtained by the method for embodiment 1～5, the long fiber that constitutes nonwoven fabric is on its surface, along fiber axis to circumferentially existing irregular concavo-convex with fiber.In addition, in the nonwoven fabric of long fibers that the method by comparative example 1 obtains, the long fiber surface of formation nonwoven fabric to being smooth, does not exist concavo-convex along fiber axis.By so irregular concavo-convex existence, for core sheath shape composite long fiber, exist thin part of fibre diameter and thicker part branch, existence because of the thin part of fibre diameter, give long fiber self flexibility, as a result, comparing with the nonwoven fabric of comparative example 1 as the nonwoven fabric of the embodiment 1～5 that constitutes fiber with this long fiber, flexibility and soft feeling are excellent.In addition, because of this irregular concavo-convex existence, the light that contacts with this nonwoven surface is at random easily, and the nonwoven fabric of embodiment 1～5 is compared with comparative example 1, and whiteness is higher.
In addition, because of being that the first poly melting point that obtains of polymerization catalyst is lower usually, use the also step-down of poly melting point among this first poly embodiment 1～5 by metallocene.Therefore, the nonwoven fabric of embodiment 1～5 is compared with the nonwoven fabric of comparative example 1, even the temperature of thermo-compressed is lower, also can obtain good heat-seal strength.In addition, same by the core that polyester forms, owing to do not change to, transverse shape, become the uniform fibers diameter in fact at fiber axis, keep TENSILE STRENGTH by it, thereby the nonwoven fabric of embodiment 1～5 has and the same TENSILE STRENGTH of nonwoven fabric of comparative example 1 in the past.

Claims (8)

1. nonwoven fabric, it is characterized in that, core is made of polyester and sheath portion is made of polyethylene and the transverse shape of core fiber axis to do not change, the thickness of sheath portion at fiber axis to the core sheath shape composite fibre of and change at random circumferentially inhomogeneous with fiber as constituting fiber, wherein, the polyethylene that forms sheath portion is for being first polyethylene that obtains of polymerization catalyst by metallocene and be the second poly mixture that polymerization catalyst obtains by Z-N.
2. according to the described nonwoven fabric of claim 1, it is characterized in that core sheath shape composite fibre is a long fiber.
3. according to the described nonwoven fabric of claim 1, it is characterized in that second polyethylene is a low density polyethylene (LDPE).
4. core sheath shape composite fibre, core is made of polyester, sheath portion is made of polyethylene, and the transverse shape of core at fiber axis to not changing, the thickness of sheath portion fiber axis to the circumferential inhomogeneous and change at random of fiber, it is characterized in that the polyethylene that forms sheath portion is for being first polyethylene that obtains of polymerization catalyst by metallocene and be the second poly mixture that polymerization catalyst obtains by Z-N.
5. composite, by the sheath portion of softening and molten core sheath shape composite fibre, and described nonwoven fabric of claim 1 and polyolefin film is bonding.
6. the manufacture method of a nonwoven fabric, it is characterized in that, make polyester and will be first polyethylene that obtains of polymerization catalyst and be that the polyethylene that mixes of second polyethylene that polymerization catalyst the obtains mode that this polyethylene is disposed at sheath portion so that this polyester is disposed at core is supplied with to core-sheath-type composite spinning hole by Z-N by metallocene, and with the core sheath shape long fiber gathering of melt spinning acquisition.
7. according to the manufacture method of the described nonwoven fabric of claim 6, it is characterized in that poly melt flow ratio MFR is 16～21g/10 branch.
8. according to the manufacture method of the described nonwoven fabric of claim 6, it is characterized in that the speed of melt spinning is 3000～4000m/ branch.
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