Novel environment-friendly PEF fiber

Abstract

The utility model relates to a novel environment-friendly PEF fiber which comprises a multifilament structure formed by weaving at least 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 utility model relates to the technical field of spinning, and particularly relates to a new type of environmentally friendly PEF fiber. Background Technique

[0002] Furan ring polyester (PEF) is a new type of bio-based plastic, which is formed by polycondensation of 2,5-furandicarboxylic acid (FDCA) and ethylene glycol (EG) obtained by sugar fermentation from biomass resources such as corn and sugarcane. It is similar to PET in structure, but by changing the structure of the polymer chain and adding specific additives, PEF has higher rigidity, strength, heat resistance and barrier properties. PEF usually has better recycling performance and biodegradability, which gives it certain advantages in environmental protection. At present, the application of bio-based furan polyester mainly focuses on food and beverage packaging, medical consumables, etc. with high requirements for barrier properties and heat resistance, and it is still blank in the field of chemical fiber and textile. Content of the Utility Model

[0003] In order to solve the blank existing in the above-mentioned textile technology field, the utility model provides a new type of environmentally friendly PEF fiber.

[0004] The utility model discloses a new type of environmentally friendly PEF fiber, which comprises a multifilament structure woven by at least one PEF yarn.

[0005] Preferably, the multifilament is a skin-core structure, the melting point of the core layer of the skin-core structure is higher than that of 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 is a winding structure, and the multifilament is spirally wound by at least one PEF yarn and a second yarn.

[0007] Preferably, the cross-section of the multifilament is any one of a circular shape, a triangular shape, a Y shape, and a trilobal shape. Preferably, the second yarn is any one of a composite filament, a polyester filament, or a spandex filament.

[0008] Preferably, a plurality of holes and grooves are formed on the surface of the multifilament, and the shape of the holes and grooves is one or a combination of an arc shape, a semi-circular shape, a V shape, a trapezoidal shape, and a strip shape.

[0009] Preferably, the composite filament is any one of PTT / PET, PBT / PET, PET / PA, and PET / PP

[0010] one.

[0011] Preferably, the fineness of the multifilament is 66-333 dtex.

[0012] The present utility model discloses a manufacturing method of a novel environmentally friendly PEF fiber, comprising the following steps:

[0013] Step 1: Use a vacuum rotary dehumidifier (molecular sieve) to dry the bio-based PEF chips at 160°C for 6 - 10 hours until the moisture content is reduced to ≤100 ppm, and avoid yellowing caused by long-term drying;

[0014] Step 2: Melt-extrude, spin, and cool the dried PEF chips to obtain the POY raw yarn of bio-based PEF, wherein the temperature of the first hot box is controlled within the range of 198 - 200°C;

[0015] Step 3: Draw, twist, oil, wind, inspect, and pack the POY raw yarn to obtain the DTY multifilament of bio-based PEF, wherein the oil content of the DTY multifilament is 2.3% - 2.6%, and the oil agent on the oil wheel contains a preservative to prevent nozzle blockage. The false twister adopts the form of 8 - 9 friction discs. The linear speed of the first roller is 420 - 460 m / min, and 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;

[0016] Step 4: Transport and distribute the bio-based PEF chips through a melt pipeline, accurately measure them by a metering pump, and extrude them from a spinning head;

[0017] Step 5: The extruded filaments are solidified and formed in a cooling water tank, and are subjected to multi-stage stretching and tension-relaxation heat setting treatment. The temperature of the melt conveying pipeline is 240°C, the temperature of the spinning head is 250°C, the initial pressure of the spinning head is 25 MPa, and the temperature of the cooling water tank is 20°C; The filaments are pre-drawn at 98°C by 1.1 times.

[0018] Subsequently, the second draw is carried out at 175°C by 3.8 times, and then relaxation heat setting is carried out at 160°C;

[0019] Step 6: Finally, each single filament is wound on its respective reel to obtain an elastic fiber with excellent elastic recovery rate. It is wound into a bobbin at a stretching and winding speed of 150 m / min. The multifilament linear density of the obtained product is 110 dtex, with a breaking strength of 4.8 cN / dtex, an elongation at break of 28.8%, a dry heat shrinkage rate of 7.2 - 7.8%, and a boiling water shrinkage rate of less than 4%.

[0020] By adopting the above technical solution, the beneficial effect of the present utility model is that: for the manufacturing method of spinning the furan ring polyester (PEF), the obtained PEF multifilament has a soft and smooth handfeel, excellent elasticity, strong resilience,

[0021] Bright colors, not easy to pilling, excellent color fastness, excellent moisture absorption and sweat discharge, comfortable stretch recovery, excellent stain resistance and wrinkle resistance.

[0022] The furan ring polyester (PEF) has a high bio-based content, accounting for more than 67%. Compared with petroleum-based PET, the carbon emissions are reduced by 43.8%, making it more environmentally friendly. Brief Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only one or several embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on such drawings.

[0024] Figure 1 Structural Schematic of the Present Invention Figure 1 ;

[0025] Figure 2 Structural Schematic of the Present Invention Figure 2 。

[0026] Main Reference Numeral Description: 1, cortex; 2, core layer. Detailed Description of the Embodiments

[0027] The following will combine the drawings and embodiments to detail the implementation manners of the present invention, so as to fully understand how the present invention uses technical means to solve technical problems and achieve the realization process of technical effects and implement accordingly. It should be noted that as long as there is no conflict, the various embodiments in the present invention and the various features in each embodiment can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0028] At the same time, in the following description, many specific details are set forth for the purpose of explanation to provide a thorough understanding of the embodiments of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without these specific details or in the specific manners described herein.

[0029] Embodiment 1

[0030] This embodiment provides a new type of environmentally friendly PEF fiber and its preparation method, which specifically includes the following steps:

[0031] Preparation of bio-based PEF multifilament:

[0032] Step 1: Drying. Dry the PEF to meet the spinning standard. The drying temperature of this bio-based PEF material is 80 °C, and the drying time is 6 hours;

[0033] Step 2: Melting: Place the dried PEF material into a screw extruder for melt extrusion;

[0034] Step 3: Guide the PEF material into the spinning manifold using a conduit. The bio-based PEF accounts for 98% of the total fiber mass, and the antioxidant masterbatch accounts for 2% of the total fiber mass.

[0035] Step 4: Spinning, using a spinning manifold to spin PEF fibers and cooling them. The PEF temperature during spinning is 250°C.

[0036] Step 5: Stretch and shape the cooled fiber. Wind the cooled fiber onto the first heated roller for stretching. After stretching, wind the cooled fiber onto the second heated roller for shaping to form a drawn FDY multifilament. The temperature of the first heated roller is 60°C, and the temperature of the second heated roller is 130°C. The stretching ratio is 2.0, and the winding speed is 2000 m / min. The size of the multifilament is 150D, and the number of holes in the composite fiber is 36F.

[0037] Step 6: Finished product, winding the PEF multifilament into a yarn cake;

[0038] The production process includes texturing process:

[0039] S1. The POY raw yarn is placed on the raw yarn rack, and the POY raw yarn ends pass through the wire guide tube on the raw yarn rack;

[0040] S2, wire cutter, the POY raw yarn from the wire guide passes through the wire cutter and enters the first roller;

[0041] S3, the first hot box, i.e., the deformation hot box, plasticizes the POY precursor entering the first hot box to reduce the tensile deformation stress. The temperature of the first hot box is controlled in the range of 198-200°C;

[0042] S4, cooling plate, fixing the twisted curled structure of the POY raw yarn on the cooling plate;

[0043] S5, false twister, twists and untwistes the POY raw yarn to form a false twist effect. The false twister adopts the form of friction discs, and the number of the false twister is 8-9;

[0044] S6, tension detector, used to detect the tension of processed POY raw yarn;

[0045] S7, the second roller, controls the speed to prevent the occurrence of escaping twisted yarn. The linear speed of the first roller is 420-460 m / min, and the linear speed of the second roller is 700-730 m / min.

[0046] S8. The second hot box, i.e., the shaping hot box, eliminates the internal stress of the deformed yarn and improves the dimensional stability.

[0047] S9. The air interlacer uses the two-end air jet method.

[0048] S10. The third roller has a shaping overfeed and shapes in a relatively relaxed state to eliminate most of the internal stress in the deformation.

[0049] S11. The oil applicator oils the POY raw yarn, controls the oil content rate, makes the produced DTY multifilament feel smooth, soft, and the oil content rate of the DTY multifilament is 2.3% - 2.6%.

[0050] S12. The winding roller winds to obtain the DTY multifilament, and the oil agent on the oil applicator contains an antiseptic to prevent the nozzle from being blocked.

[0051] Example 2

[0052] This example provides a preparation method of a new type of environmentally friendly PEF fiber, which specifically includes the following steps:

[0053] Preparation of bio-based PEF multifilament:

[0054] Step 1: Use a vacuum rotary dehumidifier (molecular sieve) for drying:

[0055] Dry the bio-based PEF chips at 160 °C for 6 - 10 hours until the moisture content is reduced to ≤100 ppm, and avoid yellowing caused by long-term drying.

[0056] Step 2: Melt extrusion, spinning, and cooling to obtain the POY raw yarn of bio-based PEF, where the temperature of the first hot box is controlled within the range of 198 - 200 °C.

[0057] Step 3: Drafting, twisting, oiling, winding, inspection, and packing to obtain the DTY multifilament of bio-based PEF, where the oil content rate of the DTY multifilament is 2.3% - 2.6%, and the oil agent on the oil applicator contains an antiseptic to prevent the 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 drafting multiple is 1.5 - 1.6.

[0058] Step 4: Transport and distribute the bio-based PEF chips through the melt pipeline, accurately measure them by a metering pump, and extrude them from the spinning head.

[0059] Step 5: The extruded filaments are solidified and formed in a cooling water tank and are subjected to multi-stage stretching and tension-relaxation heat setting treatment.

[0060] Among them, the temperature of the melt delivery pipeline is 240 °C, the temperature of the spinneret is 250 °C, the initial pressure of the spinneret is 25 MPa, and the temperature of the cooling water tank is 20 °C;

[0061] The filaments are pre-drawn at 98 °C by a factor of 1.1, then secondarily drawn at 175 °C by a factor of 3.8, and then relaxation heat-set at 160 °C;

[0062] Step Six: Finally, each multifilament is wound onto its respective bobbin to obtain elastic multifilaments with excellent elastic recovery rate. Among them, they are wound into bobbins at a draw-winding speed of 150 m / min. The multifilament yarn density of the produced multifilament is 110 dtex, with a breaking strength of 4.8 cN / dtex, an elongation at break of 28.8%, a dry heat shrinkage rate of 7.2 - 7.8%, and a boiling water shrinkage rate of less than 4%.

[0063] Example 3

[0064] This example provides a method for preparing a novel environmentally friendly PEF fiber, specifically including the following steps:

[0065] Preparation of bio-based PEF multifilaments:

[0066] Step One: Use a vacuum rotary dehumidifier (molecular sieve) for drying:

[0067] The bio-based PEF chips are dried at 160 °C for 8 hours until the moisture content is reduced to ≤100 ppm;

[0068] Step Two: Melt extrusion, spinning, and cooling to obtain POY raw filaments of bio-based PEF, where the temperature of the first hot box is controlled at 199 °C;

[0069] Step Three: Drawing, twisting, oiling, winding, inspection, and packing to obtain DTY multifilaments of bio-based PEF. Among them, 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 draw ratio is 1.55;

[0070] Step Four: The bio-based PEF chips are transported and distributed through the melt pipeline, accurately metered by a metering pump, and then extruded by the spinneret;

[0071] Step Five: The extruded filaments are solidified and formed in the cooling water tank, and are subjected to multi-stage stretching and tension, relaxation heat-setting treatment;

[0072] Among them, the temperature of the melt delivery pipeline is 240 °C, the temperature of the spinneret is 250 °C, the initial pressure of the spinneret is 25 MPa, and the temperature of the cooling water tank is 20 °C;

[0073] The filament is pre-drawn at 98°C with a draw ratio of 1.1, then secondarily drawn at 175°C with a draw ratio of 3.8, and then relaxation heat-set at 160°C.

[0074] Step Six: Finally, each multifilament is wound onto its respective bobbin to produce an elastic multifilament with excellent elastic recovery rate. It is wound into a bobbin at a draw-winding speed of 150 m / min. The multifilament yarn density of the produced multifilament is 110 dtex, with a breaking strength of 4.8 cN / dtex, an elongation at break of 28.8%, a dry heat shrinkage rate of 7.5%, and a boiling water shrinkage rate of less than 4%.

[0075] Example 4

[0076] This example provides a method for preparing a new type of environmentally friendly PEF fiber, which specifically includes the following steps:

[0077] Preparation of bio-based PEF multifilament:

[0078] Step One: Use a vacuum rotary dehumidifier (molecular sieve) for drying. The bio-based PEF chips are dried at 160°C for 7 hours until the moisture content is reduced to ≤100 ppm.

[0079] Step Two: Melt extrusion, spinning, and cooling are carried out to obtain the POY raw filament of bio-based PEF, where the temperature of the first hot box is controlled at 200°C.

[0080] Step Three: Drawing, twisting, oiling, winding, inspection, and packing are carried out to obtain the DTY multifilament of bio-based PEF. The oil content of the DTY multifilament is 2.5%. The false twister adopts the 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 multifilament is 2.0, and the draw ratio is 1.55.

[0081] Step Four: The bio-based PEF chips are transported and distributed through the melt pipeline, accurately metered by a metering pump, and then extruded by the spinneret.

[0082] Step Five: The extruded filaments are solidified and formed in a cooling water tank and are subjected to multi-stage stretching and tension-relaxation heat-setting treatment.

[0083] Among them, the temperature of the melt conveying pipeline is 240°C, the temperature of the spinneret is 250°C, the initial pressure of the spinneret is 25 MPa, and the temperature of the cooling water tank is 20°C.

[0084] The filaments are pre-drawn at 98°C with a draw ratio of 1.1, then secondarily drawn at 175°C with a draw ratio of 3.8, and then relaxation heat-set at 160°C.

[0085] Step 6: Finally, each multifilament is wound onto its own reel to produce an elastic multifilament with excellent elastic recovery. The multifilament is wound into a bobbin at a stretching and winding speed of 150 m / min. The obtained 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%.

[0086] Example 5

[0087] A novel environmentally friendly PEF fiber is woven from at least one PEF yarn. The multifilament / monofilament has a circular cross-section, with a core layer 2 to sheath layer 1 cross-sectional area ratio of 2:8. The core layer 2 is a low-melting-point PEF yarn, and the sheath layer 1 is a high-melting-point PEF yarn. The composite monofilament has a diameter of 0.105 mm and a fineness of 143 dtex. The surface of the multifilament / monofilament is provided with a plurality of arc-shaped slots. The second yarn is a composite filament, specifically PTT / PET.

[0088] Example 6

[0089] A new type of environmentally friendly PEF fiber, comprising at least one PEF yarn woven together. The multifilament and / or monofilament is a winding structure, formed by spirally winding at least one PEF yarn and polyester filament. The cross-section of the multifilament and / or monofilament is triangular, 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. A plurality of holes and grooves are provided on the surface of the multifilament and / or monofilament, and the shape of the holes and grooves is semicircular. The second yarn is a composite filament, specifically PBT / PET.

[0090] Example 7

[0091] A novel environmentally friendly PEF fiber is woven from at least one PEF yarn. The multifilament / monofilament has a Y-shaped cross-section, with a core layer 2 to sheath layer 1 cross-sectional area ratio of 4:6. The core layer 2 is a low-melting-point PEF yarn, and the sheath layer 1 is a high-melting-point PEF yarn. The composite monofilament has a diameter of 0.115 mm and a fineness of 160 dtex. The surface of the multifilament / monofilament is provided with a plurality of V-shaped slots. The second yarn is a composite filament, specifically PET / PA.

[0092] Example 8

[0093] A new type of environmentally friendly PEF fiber, which is composed of at least one PEF yarn woven. The cross-section of the multifilament / or monofilament is trilobal, and 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 monofilament is 0.120 mm, and the fineness of the composite monofilament is 170 dtex. A number of pore grooves are provided on the surface of the multifilament / or monofilament, and the shape of the pore grooves is trapezoidal. The second yarn is a composite filament, specifically PET / PP.

[0094] Example 9

[0095] A new type of environmentally friendly PEF fiber, which is composed of at least one PEF yarn woven. The multifilament / or monofilament is a winding structure, which is spirally wound by at least one PEF yarn and spandex filament. 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 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 monofilament is 0.125 mm, and the fineness of the composite monofilament is 180 dtex. A number of pore grooves are provided on the surface of the multifilament / or monofilament, and the shape of the pore grooves is strip-shaped. The second yarn is a composite filament, specifically PTT / PET.

[0096] Example 10

[0097] A new type of environmentally friendly PEF fiber, which is composed of at least one PEF yarn woven. The multifilament / or single

[0098] The cross-section of the filament is triangular, and 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 monofilament is 0.130 mm, and the fineness of the composite monofilament is 190 dtex. A number of pore grooves are provided on the surface of the multifilament / or monofilament, and the shape of the pore grooves is a combination of arc-shaped and semi-circular. The second yarn is a composite filament, specifically PBT / PET.

[0099] Example 11

[0100] A new type of environmentally friendly PEF fiber, which is composed of at least one PEF yarn woven. 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 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 monofilament is 0.135 mm, and the fineness of the composite monofilament is 200 dtex. A number of pore grooves are provided on the surface of the multifilament / or monofilament, and the shape of the pore grooves is a combination of V-shaped and trapezoidal. The second yarn is a composite filament, specifically PET / PA.

[0101] Example 12

[0102] A new type of environmentally friendly PEF fiber is composed of at least one PEF yarn woven. The multifilament / or monofilament is a winding structure, which is formed by helically winding at least one PEF yarn and polyester filament. The cross-section of the multifilament / or monofilament is trilobal, and 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 monofilament is 0.140 mm, and the fineness of the composite monofilament is 210 dtex. A number of pore grooves are formed on the surface of the multifilament / or monofilament, and the shape of the pore grooves is a combination of strip-shaped and arc-shaped. The second yarn is a composite filament, specifically PET / PP.

[0103] Example 13

[0104] A new type of environmentally friendly PEF fiber is composed of at least one PEF yarn woven. 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 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 monofilament is 0.145 mm, and the fineness of the composite monofilament is 220 dtex. A number of pore grooves are formed on the surface of the multifilament / or monofilament, and the shape of the pore grooves is a combination of semi-circular and V-shaped. The second yarn is a composite filament, specifically PTT / PET.

[0105] Example 14

[0106] A new type of environmentally friendly PEF fiber is composed of at least one PEF yarn woven. 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 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 monofilament is 0.150 mm, and the fineness of the composite monofilament

[0107] is 230 dtex. A number of pore grooves are formed on the surface of the multifilament / or monofilament, and the shape of the pore grooves is a combination of trapezoidal and strip-shaped. The second yarn is a composite filament, specifically PBT / PET.

[0108] Example 15

[0109] A new type of environmentally friendly PEF fiber is composed of at least one PEF yarn woven. 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. A number of pore grooves are formed on the surface of the multifilament / or monofilament, and the shape of the pore grooves is semi-circular. The second yarn is a composite filament, specifically PBT / PET.

[0110] Example 16

[0111] A new type of environmentally friendly PEF fiber is composed of at least one PEF yarn woven. The multifilament / or monofilament is a winding structure, which is spirally wound 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. A number of holes and grooves are provided on the surface of the multifilament / or monofilament, and the shape of the holes and grooves is V-shaped. The second yarn is a composite filament, specifically PET / PA.

[0112] Example 17

[0113] A new type of environmentally friendly PEF fiber is composed of at least one PEF yarn woven. 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. A number of holes and grooves are provided on the surface of the multifilament / or monofilament, and the shape of the holes and grooves is trapezoidal. The second yarn is a composite filament, specifically PET / PP.

[0114] Example 18

[0115] A new type of environmentally friendly PEF fiber is composed of at least one PEF yarn woven. The cross-section of the multifilament / or monofilament is three-lobed, and 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 monofilament is 0.120 mm, and the fineness of the composite monofilament is 170 dtex. A number of holes and grooves are provided on the surface of the multifilament / or monofilament, and the shape of the holes and grooves is strip-shaped. The second yarn is a composite filament, specifically PTT / PET.

[0116] Example 19

[0117] A new type of environmentally friendly PEF fiber is composed of at least one PEF yarn woven. The multifilament / or monofilament is a winding structure, which is spirally wound by at least one PEF yarn and spandex filament. 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 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 monofilament is 0.125 mm, and the fineness of the composite monofilament is 180 dtex. A number of holes and grooves are provided on the surface of the multifilament / or monofilament, and the shape of the holes and grooves is a combination of arc-shaped and semi-circular. The second yarn is a composite filament, specifically PBT / PET.

[0118] Example 20

[0119] A new type of environmentally friendly PEF fiber is composed of at least one PEF yarn woven. 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 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 monofilament is 0.130 mm, and the fineness of the composite monofilament is 190 dtex. A number of pore grooves are formed on the surface of the multifilament / or monofilament, and the shape of the pore grooves is a combination of V-shaped and trapezoidal. The second yarn is a composite filament, specifically PET / PA.

[0120] Example 21

[0121] A new type of environmentally friendly PEF fiber is composed of at least one PEF yarn woven. 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 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 monofilament is 0.135 mm, and the fineness of the composite monofilament is 200 dtex. A number of pore grooves are formed on the surface of the multifilament / or monofilament, and the shape of the pore grooves is a combination of strip-shaped and arc-shaped. The second yarn is a composite filament, specifically PET / PP.

[0122] Example 22

[0123] A new type of environmentally friendly PEF fiber is composed of at least one PEF yarn woven. The multifilament / or monofilament has a winding structure and is formed by helically winding at least one PEF yarn and polyester filament. The cross-section of the multifilament / or monofilament is trilobal, and 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 monofilament is 0.140 mm, and the fineness of the composite monofilament is 210 dtex. A number of pore grooves are formed on the surface of the multifilament / or monofilament, and the shape of the pore grooves is a combination of semi-circular and V-shaped. The second yarn is a composite filament, specifically PTT / PET.

[0124] Example 23

[0125] A new type of environmentally friendly PEF fiber is composed of at least one PEF yarn woven. 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 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 monofilament is 0.145 mm, and the fineness of the composite monofilament is 220 dtex. A number of pore grooves are formed on the surface of the multifilament / or monofilament, and the shape of the pore grooves is a combination of trapezoidal and strip-shaped. The second yarn is a composite filament, specifically PBT / PET.

[0126] Example 24

[0127] A new type of environmentally friendly PEF fiber is composed of at least one PEF yarn woven. 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 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 monofilament is 0.150 mm, and the fineness of the composite monofilament is 230 dtex. A number of holes and grooves are provided on the surface of the multifilament / or monofilament, and the shape of the holes and grooves is a combination of an arc and a semicircle. The second yarn is a composite filament, specifically PBT / PET.

[0128] The above schematically describes the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments without creative work without departing from the spirit of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A new type of environmentally friendly PEF fiber, characterized in that: A multifilament structure composed of at least one PEF yarn is included.

2. The novel environmentally friendly PEF fiber according to claim 1, wherein: The multifilament is of a sheath-core structure. The melting point of the core layer (2) of the sheath-core structure is higher than that of 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 fiber according to claim 1, characterized in that: The multifilament is of a winding structure. The multifilament is formed by helically winding at least one PEF yarn and a second yarn.

4. The novel environmentally friendly PEF fiber according to claim 1, wherein: The cross-section of the multifilament is any one of circular, triangular, Y-shaped, and trilobal.

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

6. The novel environmentally friendly PEF fiber according to claim 1, characterized in that: A number of holes and grooves are formed on the surface of the multifilament. The shape of the holes and grooves is one or a combination of arc-shaped, semi-circular, V-shaped, trapezoidal, and strip-shaped.

7. The novel environmentally friendly PEF fiber according to claim 5, characterized in that: The composite filament is any one of PTT / PET, PBT / PET, PET / PA, and PET / PP.

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

Images