Novel environment-friendly PEF fiber and manufacturing method thereof

Abstract

The novel environment-friendly PEF fiber comprises a multifilament structure formed by weaving at least one PEF yarn or a monofilament structure formed by one PEF yarn. After the scheme is adopted, the processed PEF multifilament is soft and silky in hand feeling, excellent in smoothness and elasticity, high in resilience, bright in color, not prone to pilling, excellent in color fastness, excellent in moisture absorption and sweat releasing performance, comfortable in stretching resilience and excellent in stain resistance and wrinkle resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spinning, in particular to a novel environment-friendly PEF fiber and a manufacturing method thereof. BACKGROUND

[0002] Furan ring polyester (PEF) is a new type of bio-based plastic, which is obtained by polycondensation of 2,5-furan dicarboxylic acid (FDCA) and ethylene glycol (EG) obtained by sugar fermentation of biomass resources such as corn, sugarcane, etc. It is similar in structure to PET, but by changing the structure of the polymer chain and adding specific additives, PEF has higher rigidity, strength, heat resistance and barrier property, PEF usually has better recycling performance and biodegradability, which makes it have certain advantages in environmental protection, and the application of bio-based furan polyester is mainly concentrated in food and beverage packaging, medical consumables and other aspects with high requirements for barrier property, heat resistance, etc. In the field of chemical fibers and textiles, it is still blank. SUMMARY

[0003] In order to solve the above-mentioned blank in the field of textile technology, the present application provides a novel environment-friendly PEF fiber and a manufacturing method thereof.

[0004] The present application discloses a novel environment-friendly PEF fiber, which comprises a multifilament structure knitted by at least one PEF yarn.

[0005] Preferably, the multifilament / yarn is a skin-core structure, the core layer of the skin-core structure has a higher melting point than the skin layer, the skin layer is a low-melting-point PEF yarn, and the core layer is a high-melting-point PEF yarn.

[0006] Preferably, the multifilament / yarn is a winding structure, and the multifilament / yarn is spirally wound by at least one PEF yarn and a second yarn.

[0007] Preferably, the cross section of the multifilament / yarn is any one of a circle, a triangle, a Y shape, and a trilobal shape.

[0008] Preferably, the second yarn is any one of a composite filament, a polyester filament, or a spandex filament.

[0009] Preferably, the cross-sectional area of the core layer accounts for 30-40% of the cross-sectional area of the body of the multifilament / yarn.

[0010] Preferably, a plurality of holes and grooves are formed on the surface of the multifilament / yarn, and the holes and grooves are in one or a combination of arc shape, semicircular shape, V shape, trapezoidal shape, and strip shape.

[0011] Preferably, the composite filament is any one of PTT / PET, PBT / PET, PET / PA, and PET / PP.

[0012] Preferably, the fineness of the multifilament and / or monofilament is 66-333 dtex.

[0013] The application discloses a novel environment-friendly PEF fiber manufacturing method, which comprises the following steps:

[0014] Step one: drying the bio-based PEF slice at 160 DEG C for 6-10 hours by using a vacuum rotary dehumidifier (molecular sieve), until the water content is reduced to ≤100 ppm, and yellowing caused by long-time drying is avoided;

[0015] Step two: melt-extruding, spinning and cooling the dried PEF slice to obtain a bio-based PEF POY original wire, wherein the temperature of the first heat box is controlled in the range of 198-200 DEG C;

[0016] Step three: drawing, twisting, oiling, winding, testing and packaging the POY original wire to obtain a bio-based PEF DTY multifilament, wherein the oil content of the DTY multifilament is 2.3%-2.6%, the oil agent on the oil wheel contains an anticorrosive agent for preventing the oil nozzle from being blocked, the false twister adopts the form of 8-9 friction discs, the linear speed of the first roller is 420-460 m / min, the linear speed of the second roller is 700-730 m / min, the D / Y ratio of the DTY multifilament is 1.5-2.6, and the draw ratio is 1.5-1.6;

[0017] Step four: conveying and distributing the bio-based PEF slice through a melt pipeline, and extruding the slice from a spinning head after accurate metering by a metering pump;

[0018] Step five: solidifying and forming the extruded yarn in a cooling water tank, and performing multi-stage stretching and tight, relaxation heat setting treatment, wherein the melt conveying pipeline temperature is 240 DEG C, the spinning head temperature is 250 DEG C, the initial pressure of the spinning head is 25 MPa, and the cooling water tank temperature is 20 DEG C; the yarn is subjected to 1.1 times of pre-drawing at 98 DEG C, then subjected to 3.8 times of second drawing at 175 DEG C, and finally subjected to relaxation heat setting at 160 DEG C;

[0019] Step six: finally, winding each monofilament on a respective winding drum to obtain an elastic fiber with excellent elastic recovery, wherein the multifilament is wound into a bobbin at a drawing winding speed of 150 m / min, the obtained multifilament has a linear density of 110 dtex, a breaking strength of 4.8 cN / dtex, a breaking elongation of 28.8%, a dry heat shrinkage of 7.2-7.8%, and a boiling water shrinkage of less than 4%.

[0020] By adopting the technical scheme, the furan ring polyester (PEF) spinning production method has the advantages that the PEF multifilament processed by the method has soft hand feeling, excellent slip elasticity, strong rebound ability, bright color, non-pilling, excellent color fastness, excellent moisture absorption and sweat releasing property, comfortable stretch recovery, excellent stain resistance and wrinkle resistance.

[0021] The furan ring polyester (PEF) has a high bio-based content of more than 67%, and the carbon emission is reduced by 43.8% compared with the petroleum-based PET, and the environmental protection is better. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following only show one or several embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0023] Figure 1 Structure diagram of the present application Figure One ;

[0024] Figure 2 Structure diagram of the present application Figure Two .

[0025] Main figure mark explanation: 1, skin layer; 2, core layer. DETAILED DESCRIPTION

[0026] The embodiments of the present application will be described in detail below with reference to the drawings and examples, so that the realization process of how to apply technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented. It should be noted that, as long as there is no conflict, each embodiment in the present application and each feature in each embodiment can be combined with each other, and the technical solutions formed thereby are all within the protection scope of the present application.

[0027] Meanwhile, in the following description, many specific details are set forth in order to provide a thorough understanding of the embodiments of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without the specific details or in a manner different from the specific description.

[0028] Embodiment 1

[0029] The present embodiment provides a new type of environment-friendly PEF fiber and a preparation method thereof, which specifically comprises the following steps: preparation of bio-based PEF multifilament.

[0030] Step one: drying, dry the PEF to meet the spinning standard, the drying temperature of the bio-based PEF material is 80℃, and the drying time is 6 hours;

[0031] Step two: melting, put the dried PEF material into the screw extruder for melting and extrusion;

[0032] Step three: yarn guide, use a guide pipe to guide the PEF material into the spinning box, the mass of the bio-based PEF is 98% of the total mass of the fiber, and the mass of the antioxidant master batch is 2% of the total mass of the fiber;

[0033] Step four: spinning, spin the PEF fiber using the spinning box and cool it down, the PEF temperature during spinning is 250℃;

[0034] Step five: drawing and setting, wind the cooled fiber onto the first hot roller for drawing, and then wind it onto the second hot roller for setting after drawing is completed, forming the drawn FDY multifilament, the first hot roller temperature is 60℃, the second hot roller temperature is 130℃; the draw ratio is 2.0, and the winding speed is 2000m / min; the size of the multifilament is 150D, and the number of holes of the composite fiber is 36F;

[0035] Step six: finished product, wind the PEF multifilament into a cheese;

[0036] The production process includes a drawing process:

[0037] S1, the POY original wire is placed on the original wire frame, the POY original wire is placed on the original wire frame, and the wire head of the POY original wire passes through the guide tube on the original wire frame;

[0038] S2, the wire cutter, the POY original wire passing through the guide wire enters the first roller through the wire cutter;

[0039] S3, the first hot box, i.e. the deformation hot box, makes the POY original wire entering the first hot box plasticize and reduce the tensile deformation stress, and the temperature of the first hot box is controlled within the range of 198-200℃;

[0040] S4, the cooling plate, the twisted and curled structure of the POY original wire on the cooling plate is fixed;

[0041] S5, the false twister, twists and untwists the POY original wire to form a false twisting effect, and the false twister adopts the form of friction disc, and the number is 8-9;

[0042] S6, the tension detector, used for detecting the tension of the processed POY original wire;

[0043] S7, the second roller, controls the vehicle speed to prevent the occurrence of false twist yarn, the linear speed of the first roller is 420-460m / min, and the linear speed of the second roller is 700-730m / min;

[0044] S8, the second heat box, i.e. the setting heat box, eliminates the internal stress of the deformed yarn and improves the dimensional stability;

[0045] S9, the networker, adopts the two-end air jet method;

[0046] S10, the third roller, setting overfeed, performs relative relaxation state setting and eliminates most of the internal stress in the deformation;

[0047] S11, the oil wheel, oils the POY yarn, and the controller controls the oil content, so that the DTY multifilament produced has a smooth and soft hand feeling, and the oil content of the DTY multifilament is 2.3%-2.6%.

[0048] S12, the winding roller, winds to obtain the DTY multifilament, and the oil agent on the oil wheel contains an anticorrosive agent to prevent the oil nozzle from being blocked.

[0049] Example 2

[0050] The embodiment provides a preparation method of a new type of environment-friendly PEF fiber, and specifically comprises the following steps: preparation of a bio-based PEF multifilament:

[0051] Step one: drying is performed by using a vacuum rotary dehumidifier (molecular sieve):

[0052] The bio-based PEF chip is dried at 160°C for 6-10 hours until the water content is reduced to ≤100 ppm, and yellowing caused by long-time drying is avoided;

[0053] Step two: melt extrusion, spinning, and cooling to obtain a POY yarn of bio-based PEF, wherein the temperature of the first heat box is controlled in the range of 198-200°C;

[0054] Step three: drawing, twisting, oiling, winding, testing, and packaging to obtain a DTY multifilament of bio-based PEF, wherein the oil content of the DTY multifilament is 2.3%-2.6%, the oil agent on the oil wheel contains an anticorrosive agent to prevent the oil nozzle from being blocked, the false twister adopts the form of 8-9 friction discs, the linear speed of the first roller is 420-460 m / min, the linear speed of the second roller is 700-730 m / min, the D / Y ratio of the DTY multifilament is 1.5-2.6, and the draw ratio is 1.5-1.6;

[0055] Step four: the bio-based PEF chip is distributed by a melt pipeline, and is extruded from a spinning head after accurate metering by a metering pump;

[0056] Step five: the extruded yarn is solidified and formed in a cooling water tank, and is subjected to multi-stage stretching and tight, relaxation heat setting treatment;

[0057] The melt conveying pipe temperature is 240°C, the spinning head temperature is 250°C, the spinning head initial pressure is 25 MPa, and the cooling water tank temperature is 20°C.

[0058] The filaments are pre-drafted by 1.1 times at 98°C, then secondly drafted by 3.8 times at 175°C, and then relaxed heat set at 160°C;

[0059] Step six: finally, each of the multifilaments is wound on a respective bobbin to obtain the elastic multifilaments with excellent elastic recovery rate, wherein the multifilaments are wound into a bobbin at a drawing winding speed of 150 m / min, and the multifilaments have a linear density of 110 dtex, a breaking strength of 4.8 cN / dtex, a breaking elongation of 28.8%, a dry heat shrinkage of 7.2-7.8%, and a boiling water shrinkage of less than 4%.

[0060] Example 3

[0061] The embodiment provides a preparation method of a novel environment-friendly PEF fiber, and specifically comprises the following steps: preparation of bio-based PEF multifilaments.

[0062] Step one: drying by using a vacuum rotary dehumidifier (molecular sieve):

[0063] The bio-based PEF chips are dried at 160°C for 8 hours until the water content is reduced to ≤100 ppm;

[0064] Step two: melt extrusion, spinning and cooling to obtain bio-based PEF POY filaments, wherein the temperature of the first heat box is controlled at 199°C.

[0065] Step three: drafting, twisting, oiling, winding, testing and packaging to obtain bio-based PEF DTY multifilaments, wherein the oil content of the DTY multifilaments is 2.4%, the false twister adopts the form of 8 friction discs, the linear speed of the first roller is 440 m / min, the linear speed of the second roller is 710 m / min, the D / Y ratio of the DTY multifilaments is 1.8, and the draft ratio is 1.55.

[0066] Step four: the bio-based PEF chips are distributed by a melt pipe conveying, and are extruded from a spinning head after accurate metering by a metering pump.

[0067] Step five: the extruded filaments are solidified and formed in a cooling water tank, and are subjected to multi-stage drafting and tight, relaxed heat setting treatment.

[0068] The melt conveying pipe temperature is 240°C, the spinning head temperature is 250°C, the spinning head initial pressure is 25 MPa, and the cooling water tank temperature is 20°C.

[0069] The yarns are pre-drafted at 98°C by a factor of 1.1, then secondarily drafted at 175°C by a factor of 3.8, and then relaxed heat-set at 160°C;

[0070] Step six: finally, each of the multifilaments is wound on a respective bobbin, to obtain elastic multifilaments having an excellent elastic recovery, wherein the winding is performed at a drawing winding speed of 150 m / min, to obtain multifilaments having a linear density of 110 dtex, a breaking strength of 4.8 cN / dtex, an elongation at break of 28.8%, a dry heat shrinkage of 7.5%, and a boiling water shrinkage of less than 4%.

[0071] Example 4

[0072] The present embodiment provides a preparation method of a new type of environmentally friendly PEF fiber, which specifically comprises the following steps: preparation of bio-based PEF multifilament:

[0073] Step one: drying is performed by using a vacuum rotary dehumidifier (molecular sieve), and the bio-based PEF chip is dried at 160°C for 7 hours until the water content is reduced to ≤100 ppm;

[0074] Step two: melt extrusion, spinning, and cooling to obtain bio-based PEF POY filaments, wherein the temperature of the first heat box is controlled at 200°C;

[0075] Step three: drafting, twisting, oiling, winding, testing, and packaging to obtain bio-based PEF DTY multifilaments, wherein the oil content of the DTY multifilaments is 2.5%, the false twister adopts a form of 9 friction discs, the linear speed of the first roller is 450 m / min, the linear speed of the second roller is 720 m / min, the D / Y ratio of the DTY multifilaments is 2.0, and the draft ratio is 1.55;

[0076] Step four: the bio-based PEF chip is distributed by melt pipeline transportation, and is extruded from a spinning head after accurate metering by a metering pump;

[0077] Step five: the extruded yarns are solidified and formed in a cooling water tank, and are subjected to multi-stage drafting and tight, relaxation heat setting treatment;

[0078] wherein the melt transportation pipeline temperature is 240°C, the spinning head temperature is 250°C, the initial pressure of the spinning head is 25 MPa, and the cooling water tank temperature is 20°C;

[0079] The yarns are pre-drafted at 98°C by a factor of 1.1, then secondarily drafted at 175°C by a factor of 3.8, and then relaxed heat-set at 160°C;

[0080] Step six: finally, each multifilament is wound on the respective bobbin, and an elastic multifilament with excellent elastic recovery rate is prepared, wherein the multifilament is wound into a bobbin at a drawing winding speed of 150 m / min, the prepared multifilament has a linear density of 110 dtex, a breaking strength of 4.8 cN / dtex, an elongation at break of 28.8%, a dry heat shrinkage of 7.4%, and a boiling water shrinkage of less than 4%.

[0081] Example 5

[0082] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament or monofilament is circular, and the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 2:8. The core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite monofilament is 0.105 mm, and the fineness of the composite monofilament is 143 dtex. The surface of the multifilament or monofilament is provided with a plurality of holes and grooves, and the shape of the holes and grooves is arc-shaped. The second yarn is a composite filament, specifically PTT / PET.

[0083] Example 6

[0084] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The multifilament or monofilament is a twisted structure, which is twisted by at least one PEF yarn and polyester filament. The cross section of the multifilament or monofilament is triangular, and the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 3:7. The core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite monofilament is 0.110 mm, and the fineness of the composite monofilament is 150 dtex. The surface of the multifilament or monofilament is provided with a plurality of holes and grooves, and the shape of the holes and grooves is semicircular. The second yarn is a composite filament, specifically PBT / PET.

[0085] Example 7

[0086] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament or monofilament is Y-shaped, and the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 4:6. The core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite monofilament is 0.115 mm, and the fineness of the composite monofilament is 160 dtex. The surface of the multifilament or monofilament is provided with a plurality of holes and grooves, and the shape of the holes and grooves is V-shaped. The second yarn is a composite filament, specifically PET / PA.

[0087] Example 8

[0088] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament / yarn is trilobal, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 5:5, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.120mm, and the fineness of the composite filament is 170dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is trapezoidal. The second yarn is a composite filament, specifically PET / PP.

[0089] Example 9

[0090] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The multifilament / yarn is a twisted structure, which is twisted by at least one PEF yarn and spandex filament. The cross section of the multifilament / yarn is circular, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 6:4, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.125mm, and the fineness of the composite filament is 180dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is strip-shaped. The second yarn is a composite filament, specifically PTT / PET.

[0091] Example 10

[0092] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament / yarn is triangular, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 7:3, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.130mm, and the fineness of the composite filament is 190dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is a combination of arc-shaped and semicircular. The second yarn is a composite filament, specifically PBT / PET.

[0093] Example 11

[0094] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament / yarn is Y-shaped, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 8:2, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.135mm, and the fineness of the composite filament is 200dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is a combination of V-shaped and trapezoidal. The second yarn is a composite filament, specifically PET / PA.

[0095] Example 12

[0096] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament / yarn is a three-leaf type, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 9:1, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.140mm, and the fineness of the composite filament is 210dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is a combination of strip and arc. The second yarn is a composite filament, specifically PET / PP.

[0097] Example 13

[0098] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament / yarn is a three-leaf type, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 9:1, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.140mm, and the fineness of the composite filament is 210dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is a combination of strip and arc. The second yarn is a composite filament, specifically PET / PP.

[0099] Example 14

[0100] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament / yarn is a three-leaf type, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 9:1, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.140mm, and the fineness of the composite filament is 210dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is a combination of strip and arc. The second yarn is a composite filament, specifically PET / PP.

[0101] Example 15

[0102] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament / yarn is a three-leaf type, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 9:1, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.140mm, and the fineness of the composite filament is 210dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is a combination of strip and arc. The second yarn is a composite filament, specifically PET / PP.

[0103] Example 16

[0104] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament / yarn is a triangular shape, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 3:7, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.110mm, and the fineness of the composite filament is 150dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is V-shaped. The second yarn is a composite filament, specifically PET / PA.

[0105] Example 17

[0106] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament / yarn is a Y-shaped, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 4:6, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.115mm, and the fineness of the composite filament is 160dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is trapezoidal. The second yarn is a composite filament, specifically PET / PP.

[0107] Example 18

[0108] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament / yarn is a trilobal shape, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 5:5, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.120mm, and the fineness of the composite filament is 170dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is strip-shaped. The second yarn is a composite filament, specifically PTT / PET.

[0109] Example 19

[0110] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The multifilament / yarn is a twisted structure, which is twisted by at least one PEF yarn and spandex filament. The cross section of the multifilament / yarn is a circular shape, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 6:4, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.125mm, and the fineness of the composite filament is 180dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is a combination of arc-shaped and semicircular-shaped. The second yarn is a composite filament, specifically PBT / PET.

[0111] Example 20

[0112] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament / yarn is triangular, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 7:3, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.130mm, and the fineness of the composite filament is 190dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is a combination of V-shaped and trapezoidal. The second yarn is a composite filament, specifically PET / PA.

[0113] Example 21

[0114] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament / yarn is Y-shaped, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 8:2, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.135mm, and the fineness of the composite filament is 200dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is a combination of strip-shaped and arc-shaped. The second yarn is a composite filament, specifically PET / PP.

[0115] Example 22

[0116] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The multifilament / yarn is a winding structure, which is spirally wound by at least one PEF yarn and polyester filament. The cross section of the multifilament / yarn is trilobal, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 9:1, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.140mm, and the fineness of the composite filament is 210dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is a combination of semicircular and V-shaped. The second yarn is a composite filament, specifically PTT / PET.

[0117] Example 23

[0118] A new environmentally friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament / yarn is circular, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 1:9, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite filament is 0.145mm, and the fineness of the composite filament is 220dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is a combination of trapezoidal and strip-shaped. The second yarn is a composite filament, specifically PBT / PET.

[0119] Example 24

[0120] A new type of environment-friendly PEF fiber is knitted by at least one PEF yarn. The cross section of the multifilament / yarn is triangular, the cross-sectional area ratio of the core layer 2 to the skin layer 1 is 1:1, the core layer 2 is a low-melting-point PEF yarn, and the skin layer 1 is a high-melting-point PEF yarn. The diameter of the composite yarn is 0.150 mm, and the fineness of the composite yarn is 230 dtex. The surface of the multifilament / yarn is provided with a plurality of hole grooves, and the shape of the hole grooves is a combination of arc and semicircle. The second yarn is a composite filament, specifically PBT / PET.

[0121] The above description of the present application and its embodiments is illustrative and not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it, without departing from the purpose of the present application, similar structure and embodiments can be designed without creativity, which should belong to the protection scope of the present application.

Claims

1. A novel environmentally friendly PEF fiber, characterized in that: It includes multifilament structures woven from at least one PEF yarn or monofilament structures composed of a single PEF yarn.

2. The novel environmentally friendly PEF multifilament according to claim 1, characterized in that: The multifilament / or monofilament has a core-sheath structure, the core layer (2) of the core-sheath structure has a higher melting point than the sheath layer (1), the sheath layer (1) is a low-melting-point PEF yarn, and the core layer (2) is a high-melting-point PEF yarn.

3. The novel environmentally friendly PEF multifilament according to claim 1, characterized in that: The multifilament / or monofilament has a wound structure, and the multifilament / or monofilament is formed by spirally winding at least one PEF yarn with a second yarn.

4. The novel environmentally friendly PEF multifilament according to claim 1, characterized in that: The cross-section of the multifilament / or monofilament is any one of circular, triangular, Y-shaped, or trefoil-shaped.

5. The novel environmentally friendly PEF multifilament according to claim 3, characterized in that: The second yarn is any one of composite filament, polyester filament, or spandex filament.

6. The novel environmentally friendly PEF multifilament according to claim 2, characterized in that: The cross-sectional area of ​​the core layer (2) accounts for 30-40% of the cross-sectional area of ​​the multifilament / or monofilament body.

7. The novel environmentally friendly PEF multifilament according to claim 1, characterized in that: The surface of the multifilament / or monofilament has a plurality of holes and grooves, the shape of which is one or more combinations of arc, semi-circular, V-shaped, trapezoidal, and strip-shaped.

8. The novel environmentally friendly PEF multifilament according to claim 1, characterized in that: The composite filament is any one of PTT / PET, PBT / PET, PET / PA, and PET / PP.

9. The novel environmentally friendly PEF multifilament according to claim 1, characterized in that: The fineness of the multifilament / or monofilament is 66-333 dtex.

10. A method for producing a novel environmentally friendly PEF fiber, characterized in that: Includes the following steps: Step 1: Use a vacuum rotary dehumidifier (molecular sieve) to dry the bio-based PEF slices at 160℃ for 6-10 hours until the moisture content is reduced to ≤100ppm, and avoid yellowing caused by prolonged drying. Step 2: The dried PEF chips are melt-extruded, spun, and cooled to obtain POY precursor fibers of bio-based PEF, wherein the temperature of the first heating box is controlled within the range of 198-200℃. Step 3: The POY raw yarn is drawn, twisted, oiled, wound, inspected, and packaged to obtain bio-based PEF DTY multifilament. The oil content of the DTY multifilament is 2.3%-2.6%, and the oil on the oiler contains a preservative to prevent the oil nozzle from clogging. The false twister adopts the form of 8-9 friction discs. The linear speed of the first roller is 420-460m / min, the linear speed of the second roller is 700-730m / min, the D / Y ratio of the DTY multifilament is 1.5-2.6, and the draw ratio is 1.5-1.

6. Step 4: The bio-based PEF chips are conveyed and distributed through the melt pipeline, precisely metered by the metering pump, and then extruded from the spinning head; Step 5: The extruded filaments are solidified in a cooling water tank and undergo multi-stage stretching, tension, and relaxation heat setting treatments. The melt conveying pipe temperature is 240℃, the spinning head temperature is 250℃, the initial spinning head pressure is 25MPa, and the cooling water tank temperature is 20℃. The filaments are pre-stretched by 1.1 times at 98℃, followed by a second stretching of 3.8 times at 175℃, and then relaxed heat setting at 160℃. Step Six: Finally, each monofilament is wound onto its own spool to produce an elastic fiber with excellent elastic recovery. The multifilament produced by winding the multifilament into a spool at a stretching speed of 150 m / min has a linear density of 110 dtex, a breaking strength of 4.8 cN / dtex, a breaking elongation of 28.8%, a dry heat shrinkage of 7.2-7.8%, and a boiling water shrinkage of less than 4%.

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