Composite two-component soft yarn and preparation method and equipment thereof

Abstract

The invention relates to the technical field of composite fibers, in particular to a composite two-component soft yarn and a preparation method and equipment thereof. The preparation method comprises the following steps: sequentially carrying out heating stretching, cooling, false twisting and pre-interlacing on PET (Polyethylene Terephthalate) fibers, interlacing the PET fibers and PBT (Polybutylece Terephthalate) fibers subjected to heating semi-stretching together, and then winding to obtain the composite two-component soft yarn. According to the preparation method, the PET fiber is processed into a light net and then is compounded with the heated and semi-stretched PBT fiber to form a semi-stretched POY + DTY fiber combined structure, so that the composite fiber has skin-friendly and soft touch feeling and keeps certain stiffness and smoothness, and the effect that the outer part is soft and the inner part is rigid is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of composite fibers, and particularly to a composite two-component soft-sense yarn, a preparation method thereof, and equipment therefor. Background Art

[0002] PBT (polybutylene terephthalate) fiber and PET (polyethylene terephthalate) both belong to a kind of polyester fiber and have wide applications in the textile industry.

[0003] Since the molecular chain of PET contains benzene rings to form a conjugated structure, the molecular chain has a relatively large rigidity. Although this structure has good physical properties, the fabric made therefrom is relatively hard, lacking softness and comfort, with poor hygroscopicity, and having a higher dyeing difficulty and cost compared to other fibers. While PBT has a relatively long flexible part on the basic chain link of its macromolecule, resulting in a lower melting point and glass transition temperature of the fiber compared to PET. This characteristic leads to an increase in the flexibility and elasticity of the macromolecular chain of PBT fiber, making the hand feeling of PBT-made products softer. However, the complexity of its processing technology and equipment makes the cost relatively high. Blending PBT and PET combines the advantages of the two fibers, obtaining a yarn that is soft, has good physical properties, and is low in cost.

[0004] For a conventional method of blending PET and PBT, reference can be made to the Chinese invention patent with the publication number CN118326558A. The composite filament bundle after side-by-side spinning is successively subjected to cooling, oiling, pre-network treatment, hot roller treatment, main network treatment, and winding and forming to form PET / PBT composite fiber. However, the flexibility and air permeability of this preparation method are relatively poor. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: to provide a soft and skin-friendly composite two-component soft-sense yarn, a preparation method thereof, and equipment therefor.

[0006] To solve the above technical problem, the technical solution adopted by the present invention is: a preparation method of a composite two-component soft-sense yarn, comprising the following steps: the PET fiber is successively subjected to heating and stretching, cooling, false twisting, and pre-networking, and then is networked with the PBT fiber that has been heated and semi-stretched, and then winding is carried out to obtain the composite two-component soft-sense yarn.

[0007] Another technical solution adopted by the present invention is: a composite two-component soft-sense yarn prepared by using the above preparation method of the composite two-component soft-sense yarn.

[0008] Another technical solution adopted by the present invention is as follows: The equipment used in the preparation method of the above-mentioned composite two-component soft-touch yarn includes a double-hole nozzle. Two wire grooves are correspondingly arranged on the nozzle holes of the double-hole nozzle, and a detachable sealing piece is arranged on the side of the nozzle hole away from the wire groove. A false twister, a cooling plate, and a hot box are sequentially arranged at the entrance of one of the wire grooves; a hot roller is arranged at the entrance of the other wire groove; a single-hole nozzle is arranged at the outlet of the double-hole nozzle.

[0009] The beneficial effects of the present invention are as follows: In the preparation method of the present invention, PET fibers are processed into a light web and then compounded with heated semi-drawn PBT fibers to form a fiber combination structure of semi-drawn POY (pre-oriented yarn) + DTY (drawn textured yarn), so that the composite fiber has a skin-friendly and soft touch, and at the same time maintains a certain degree of stiffness, achieving the effect of being soft on the outside and rigid on the inside. Brief Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of the equipment in the specific embodiment of the present invention; Figure 2 It is a front view of the Y-shaped support in the specific embodiment of the present invention; Figure 3 It is a schematic structural diagram of the triangular porcelain part in the specific embodiment of the present invention; Figure 4 It is a front view of the double-hole nozzle in the specific embodiment of the present invention; Figure 5 It is a rear view of the double-hole nozzle in the specific embodiment of the present invention; Figure 6 It is a schematic diagram of the nozzle hole size and drilling direction of the double-hole nozzle in the specific embodiment of the present invention; Figure 7 It is a woven finished product diagram of the composite two-component soft-touch yarn in the embodiment of the present invention; Label Description: 1. False twister; 2. Cooling plate; 3. Hot box; 4. Hot roller; 5. Y-shaped support; 51. Triangular porcelain part; 511. Notch; 6. Friction roller; 7. Apron roller; 8. Double-hole nozzle; 81. Nozzle hole; 82. Wire groove; 83. Sealing piece; 84. Groove; 9. Single-hole electromagnetic nozzle; 101. First roller; 102. Second roller; 103. Third roller; 104. Fourth roller; 105. Fifth roller; 106. First wire hook; 107. Second wire hook; 108. Third wire hook. Specific Embodiments

[0011] To describe the technical content, achieved objectives and effects of the present invention in detail, the following is described in conjunction with the embodiments and with reference to the drawings.

[0012] Please refer to Figure 1 , a method for preparing a composite two-component soft feeling yarn, comprising the following steps: After the PET fiber is successively subjected to heat drawing, cooling, false twisting and pre-networking, it is networked together with the PBT fiber that has been heat semi-drawn, and then wound to obtain the composite two-component soft feeling yarn.

[0013] As can be seen from the above description, the beneficial effects of the present invention are as follows: The preparation method of the present invention uses PBT fiber with higher cost and PET fiber with lower cost as raw materials for compounding to achieve the effect of reducing cost. After the PET fiber is processed into a light network and then compounded with the PBT fiber, the interaction force between the PET fibers is enhanced, the cohesion of the filament bundle is increased, and the elasticity is indirectly improved; the above processes are combined with the PBT fiber only being heat semi-drawn instead of the conventional heat full-drawn, which can improve the fiber hand feeling to make it have a certain fluffiness, improve the disadvantage of poor moisture absorption of the PET fiber and the PBT fiber, and make the fabric feel more comfortable.

[0014] Further, the pressure during the pre-networking of the PET fiber is 0.8 - 1.2 bar.

[0015] Further, the PBT fiber is heat semi-drawn through a hot roller, and the temperature of the hot roller is 130 - 140 °C.

[0016] As can be seen from the above description, by performing point heat semi-drawing through a hot roller, compared with the conventional use of a hot box for linear heat full-drawing, only contact heating during stretching is provided, reaching a state of incomplete stretching and orientation, making the fiber structure relatively loose, with a lower strength compared to fully drawn PBT fiber, soft hand feeling, and having a certain elasticity, producing an effect similar to imitating wool and down, and the skin-friendly touch is more comfortable.

[0017] Further, the contact length between the PBT fiber and the hot roller is 2 - 3.5 cm.

[0018] As can be seen from the above description, the contact between the fiber and the hot roller plays the role of heat drawing and heat preservation. When the contact length increases, the fiber can be heated more evenly and is more convenient for stretching, but the greater the contact length, the greater the friction, and the operation difficulty relatively increases. In the present invention, the hot roller only plays a small stretching role, without false twisting, and a shorter contact length can be used.

[0019] Further, titanium dioxide is added to the PET fiber to make it a full dull fiber.

[0020] As can be seen from the above description, the addition of titanium dioxide increases the friction coefficient between the PET fibers, makes the fiber cohesion more compact, and the hand feeling is softer. Furthermore, the PBT fiber is a fully matte fiber.

[0021] From the above description, it can be seen that due to the obvious difference in color absorption between PBT fiber and PET fiber, the woven fabric surface has a dotted heather gray effect.

[0022] Furthermore, the cross section of the PET fiber is a cross section.

[0023] From the above description, it can be seen that the cross section of the PET fiber is a cross section, which improves its moisture absorption performance.

[0024] Another technical solution adopted by the present invention is: the composite two-component soft-feel yarn is prepared by adopting the preparation method of the composite two-component soft-feel yarn.

[0025] Please refer to Figure 4 and 5 Another technical solution adopted by the present invention is: the equipment used in the preparation method of the composite two-component soft yarn as mentioned above includes a double-hole nozzle, two wire grooves are correspondingly arranged on the nozzle hole of the double-hole nozzle, and a removable sealing sheet is arranged on the side of the nozzle hole away from the wire groove; a false twister, a cooling plate and a heat box are arranged in sequence at the entrance of one wire groove; a hot roller is arranged at the entrance of the other wire groove; a single-hole nozzle is arranged at the outlet of the double-hole nozzle.

[0026] Furthermore, the single-hole nozzle is a single-hole electromagnetic nozzle.

[0027] From the above description, it can be seen that the PBT fiber is semi-stretched by point heating through a hot roller to reach a state of incomplete stretching and orientation, making the fiber structure looser, softer to the touch, and more skin-friendly.

[0028] The removable sealing sheet is used to adjust the air outlet state of the double-hole structure, and realize the addition or non-addition of mesh to any nozzle hole. Using the double-hole nozzle, the solution that requires two-step compounding (first processing PET fiber into a light mesh, and then compounding with PBT fiber) can be changed to a one-step method. PET fiber / POY (pre-oriented yarn) achieves a light mesh effect through a specific double-hole nozzle, and is compounded with PBT fiber / POY through a single-hole nozzle, effectively reducing production costs, shortening process time, and reducing losses.

[0029] When used with a single-hole nozzle, fabric diversification and personalization can be achieved while maintaining the softness of the fabric, meeting the needs of different consumers and increasing the added value of the product.

[0030] Please refer to Figure 6 Furthermore, the aperture of the nozzle hole is punched at an angle of 45° from top to bottom from the side where the wire groove is provided to the side away from the wire groove.

[0031] As can be seen from the above description, the drilling direction of the nozzle hole is consistent with the silk path trend, which can reduce resistance, improve efficiency, and increase stability.

[0032] Furthermore, the aperture of the nozzle hole increases from the side with the wire groove to the side away from the wire groove.

[0033] As can be seen from the above description, utilizing the Laval effect, the aperture of the back side of the hole is large and the aperture of the front side is small. When the air flow passes through the narrow area, the speed will increase, which can intensify the impact force of the air flow and achieve energy conservation.

[0034] Furthermore, on the side with the wire groove, grooves are provided in the circumferential direction of the nozzle hole.

[0035] As can be seen from the above description, under the action of the air flow, the yarns are intertwined in this groove.

[0036] Furthermore, on the side of the nozzle hole away from the wire groove, a sealing groove is provided. The sealing groove surrounds the nozzle hole and has an opening. The sealing groove is adapted to the shape of the sealing piece, and the sealing piece is inserted into or pulled out of the sealing groove through the opening.

[0037] As can be seen from the above description, the sealing piece is inserted into or pulled out of the sealing groove through the opening to adjust the air outlet state, and to achieve adding or not adding a screen to any nozzle hole.

[0038] Furthermore, at the inlet of the double-hole nozzle, a Y-shaped supporter, a friction roller, and a leather roller are provided; the PET fiber passes through the hot box, the cooling plate, the false twister, the Y-shaped supporter, the friction roller, and the leather roller in sequence and enters the double-hole nozzle; the PBT fiber passes through the hot roller, the Y-shaped supporter, the friction roller, and the leather roller in sequence and enters the double-hole nozzle.

[0039] Please refer to Figure 2 and 3 , furthermore, two triangular porcelain parts are provided at the top of the Y-shaped supporter.

[0040] Furthermore, a notch is provided below the triangular porcelain part.

[0041] As can be seen from the above description, under normal circumstances, the yarn comes out of the false twister and passes through a wire inlet groove. The S-direction and Z-direction yarns converge in this groove and change from two strands to one strand in appearance. However, for the yarn of the present invention to achieve the effect of a light screen after texturing the PET fiber, the yarn needs to maintain a double-strand independent state before entering the double-hole nozzle. Therefore, a Y-shaped supporter with a "Y-shaped" appearance is designed. Two triangular porcelain parts are provided at the top of this supporter. During use, the yarn enters the triangular porcelain parts through the notch for support, so that the silk path remains stable.

[0042] Further, it further includes a first roller, a second roller, a third roller, a fourth roller, a fifth roller, a sixth roller, a first wire hook, a second wire hook, and a third wire hook; a false twister, a cooling plate, a hot box, and a first roller are sequentially arranged at the entrance of a wire groove; a second wire hook, a third roller, a hot roller, a first wire hook, and a second roller are sequentially arranged at the entrance of another wire groove; a third wire hook, a fourth roller, a single-hole nozzle, and a fifth roller are sequentially arranged at the outlet of a double-hole nozzle.

[0043] Further, a wire shifting plate is arranged below the second roller, and the wire shifting plate is in threaded connection with a Y-shaped support.

[0044] As can be seen from the above description, the Y-shaped support moves slightly left and right with the wire shifting plate, which can avoid concentrated wear on the leather roller.

[0045] Please refer to Figures 1 - 6 , Embodiment 1 of the present invention is: a device used for preparing a composite two-component soft-sense yarn, including a false twister 1, a cooling plate 2, a hot box 3, a hot roller 4, a Y-shaped support 5, a friction roller 6, a leather roller 7, a double-hole nozzle 8, a single-hole electromagnetic nozzle 9, a first roller 101, a second roller 102, a third roller 103, a fourth roller 104, a fifth roller 105, a first wire hook 106, a second wire hook 107, and a third wire hook 108.

[0046] The Y-shaped support 5, the friction roller 6, the leather roller 7, and the double-hole nozzle 8 are sequentially arranged. The Y-shaped support 5 includes two triangular ceramic parts 51, and a notch 511 is arranged below the triangular ceramic part 51; a false twister 1, a cooling plate 2, a hot box 3, and a first roller 101 are sequentially arranged at the entrance of one triangular ceramic part 51; a second wire hook 107, a third roller 103, a hot roller 4, a first wire hook 106, and a second roller 102 are sequentially arranged at the entrance of the other triangular ceramic part 51; a third wire hook 108, a fourth roller 104, a single-hole electromagnetic nozzle 9, and a fifth roller 105 are sequentially arranged at the outlet of the double-hole nozzle 8.

[0047] A wire shifting plate is arranged below the second roller 102, and the wire shifting plate is in threaded connection with the Y-shaped support 5. Two wire grooves 82 are correspondingly arranged on the nozzle hole 81 of the double-hole nozzle 8. A sealing groove and a detachable sealing piece 83 are arranged on the side of the nozzle hole 81 away from the wire grooves 82. The sealing groove surrounds the nozzle hole 81 and has an opening. The sealing groove and the sealing piece 83 are in a shape-matching relationship. The sealing piece 83 is inserted into or pulled out of the sealing groove through the opening; on the side with the wire grooves 82, a groove 84 is arranged on the circumference of the nozzle hole 81; the aperture of the nozzle hole 81 is drilled obliquely downward at 45° from the side with the wire grooves 82 to the side away from the wire grooves 82, and the aperture increases.

[0048] Embodiment 2 of the present invention is as follows: A method for preparing a composite two-component soft feeling yarn using the equipment of Embodiment 1, the steps are as follows: The PET fiber sequentially passes through the first roller 101, the hot box 3, the cooling plate 2, the false twister 1, the Y-shaped support 5, the friction roller 6 and the leather roller 7, then is pre-networked at the double-hole nozzle 8, and then sequentially passes through the third wire hook 108 and the fourth roller 104, and enters the single-hole electromagnetic nozzle 9; The PBT fiber sequentially passes through the second roller 102, the first wire hook 106, the hot roller 4, the third roller 103, the second wire hook 107, the Y-shaped support 5, the friction roller 6 and the leather roller 7, then is not pre-networked at the double-hole nozzle 8, and then sequentially passes through the third wire hook 108 and the fourth roller 104, and enters the single-hole electromagnetic nozzle 9; The PET fiber and the PBT fiber are complexed at the single-hole electromagnetic nozzle 9 and then enter the fifth roller 105 together to obtain the composite two-component soft feeling yarn, see Figure 7 . The physical properties of the raw materials and the finished products are shown in Table 1, the main production processes are shown in Table 2, the contact length between the PBT fiber and the hot roller 4 is 3 cm, the PET fiber is a fully dull cross-section fiber added with titanium dioxide, and the PBT fiber is a fully dull fiber added with titanium dioxide.

[0049] Table 1

[0050] Table 2

[0051] Note: W1.0 1.72% means 550 / 1.72 = 319 m / min, and the calculation methods of W1.0, W1.2, W1.1, W2X and W3.0 are the same, which respectively represent the yarn speeds of the first roller, the second roller, the third roller, the fourth roller and the fifth roller on the machine, and W2 is the yarn speed at the leather roller, that is, the vehicle speed. The pre-network uses a modified double-hole nozzle, and the network uses a single-hole electromagnetic nozzle. The data of the single-hole electromagnetic nozzle indicates that the length with network nodes is about 8 - 12 cm, and the length in the non-network stage is about 2 - 3 cm, which can be adjusted according to different requirements, and the long path effect of the texture can be changed.

[0052] Embodiment 3 of the present invention is as follows: A method for preparing a composite two-component soft feeling yarn, the steps are as follows: The PET fiber is sequentially heated and stretched, cooled, false twisted and pre-networked, and then is networked together with the PBT fiber that has been heated and semi-stretched, and then is wound to obtain the composite two-component soft feeling yarn; The pressure of the PET fiber during pre-networking is 0.8 bar; The PBT fiber is heated and semi-stretched by a hot roller, the temperature of the hot roller is 130 °C, and the contact length between the PBT fiber and the hot roller is 2 cm; The PET fiber is a fully dull cross-section fiber added with titanium dioxide, and the PBT fiber is a fully dull fiber added with titanium dioxide.

[0053] Embodiment 4 of the present invention is as follows: A method for preparing a composite two-component soft-sense yarn, the steps are as follows: After the PET fiber is successively subjected to heating and stretching, cooling, false twisting and pre-networking, it is networked together with the PBT fiber that has been heated and semi-stretched, and then wound to obtain a composite two-component soft-sense yarn; The pressure of the PET fiber during pre-networking is 1.2 bar; The PBT fiber is heated and semi-stretched by a hot roller, the temperature of the hot roller is 140 °C, and the contact length between the PBT fiber and the hot roller is 3.5 cm; The PET fiber is a fully delustered cross-section fiber added with titanium dioxide, and the PBT fiber is a fully delustered fiber added with titanium dioxide.

[0054] Embodiment 5 of the present invention is: The composite two-component soft-sense yarn prepared by the preparation method of Embodiment 2. This composite two-component soft-sense yarn has a soft and delicate cotton-like touch, and is skin-friendly, comfortable and gentle.

[0055] In summary, for the composite two-component soft-sense yarn, its preparation method and equipment provided by the present invention, cross-shaped fully delustered PET fiber and fully delustered PBT fiber are selected as raw materials. Due to the obvious color absorption difference between the two materials of PBT fiber and PET fiber, the fabric surface shows a dotted linen gray effect. The PET fiber is false-twisted according to the normal silk path, and a pressure of 0.8-1.2 bar is applied to it at the pre-networking point through the porcelain part of the Y-shaped support device, so that the shaped bundle forms a light network. The PBT fiber passes through the hot roller and forms semi-stretching under the action of a lower temperature and the third roller, making its fiber structure loose and the crystallinity of the fiber increase accordingly. The back wire hook is not false-twisted and directly enters the Y-shaped support device, so that the PBT fiber and the PET fiber yarn are in a separated state at the double-hole nozzle to add a network to the PET fiber, while the PBT fiber is not networked; Then, a wire hook is used to concentrate the PBT fiber and the PET fiber filaments to facilitate their entry into the single-hole nozzle for uniform networking, and a composite two-component soft-sense yarn with a consistent texture effect, a soft and delicate cotton-like touch, and a skin-friendly, comfortable and gentle feel is obtained. By modifying the double-hole nozzle, the present invention can effectively reduce production costs, shorten the process working hours, and reduce losses.

[0056] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent transformations made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in related technical fields, are similarly included in the patent protection scope of the present invention.

Claims

1. A preparation method of a composite two-component soft-feeling yarn, characterized in that It includes the following steps: After the PET fiber is successively subjected to heat drawing, cooling, false twisting and pre-networking, it is networked together with the PBT fiber that has been heat semi-drawn, and then wound to obtain a composite two-component soft yarn.

2. The preparation method of the composite two-component soft-feeling yarn according to claim 1, characterized in that, The pressure of the PET fiber during pre-networking is 0.8 to 1.2 bar.

3. The preparation method of the composite two-component soft feeling yarn according to claim 1, characterized in that, The PBT fiber is heat semi-drawn by a hot roller, and the temperature of the hot roller is 130 to 140 °C.

4. The preparation method of the composite two-component soft feeling yarn according to claim 3, characterized in that, The contact length between the PBT fiber and the hot roller is 2 to 3.5 cm.

5. The preparation method of the composite two-component soft-sense yarn according to claim 1, characterized in that, Titanium dioxide is added to the PET fiber to form a full dull fiber.

6. The preparation method of the composite two-component soft feeling yarn according to claim 1, characterized in that, The cross-section of the PET fiber is a cross-section.

7. A composite two-component soft yarn prepared by using the preparation method of the composite two-component soft yarn according to any one of claims 1-6.

8. The equipment used in the preparation method of the composite two-component soft-sense yarn according to any one of claims 1-6, characterized in that, It includes a double-hole nozzle. Two wire grooves are correspondingly arranged on the nozzle holes of the double-hole nozzle. A detachable sealing piece is arranged on the side of the nozzle hole away from the wire groove; a false twister, a cooling plate and a hot box are successively arranged at the entrance of one of the wire grooves; a hot roller is arranged at the entrance of the other wire groove; a single-hole nozzle is arranged at the outlet of the double-hole nozzle.

9. The device according to claim 8, characterized in that A Y-shaped supporter, a friction roller and a leather roller are arranged at the entrance of the double-hole nozzle; the PET fiber successively passes through a hot box, a cooling plate, a false twister, a Y-shaped supporter, a friction roller and a leather roller and enters the double-hole nozzle; the PBT fiber successively passes through a hot roller, a Y-shaped supporter, a friction roller and a leather roller and enters the double-hole nozzle.

10. The device according to claim 9, characterized in that, Two triangular porcelain parts are arranged at the top of the Y-shaped supporter.

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