A kind of light, breathable and UV-proof fabric for children and its preparation process

Abstract

The invention discloses a light, thin, breathable and UV-proof fabric for children, comprising a polyester cotton fiber layer, a breathable layer and a silk cotton fiber layer arranged in sequence from top to bottom; the polyester cotton fiber layer and the silk cotton fiber layer are respectively blended and manufactured through the processes of raw fiber preparation, cleaning, carding, drawing, roving and spinning; the breathable layer is woven with bamboo fiber yarn; the polyester cotton yarn, bamboo fiber yarn and silk cotton yarn in the polyester cotton fiber layer, the silk cotton fiber layer and the breathable layer are polyester cotton yarn, bamboo fiber yarn and silk cotton yarn that are shaped by a yarn setting machine after the spinning process and before the weaving process. The invention forms a shaped yarn with a variable cross-section after the yarn is initially shaped and finally shaped through a pulling initial shaping mechanism and a heat setting mechanism in sequence, so that the light, thin, breathable and UV-proof fabric for children woven by the yarn absorbs moisture and becomes far away from the human body when the human body sweats, and can adjust the wearing comfort, improve the heat dissipation and sweat discharge.

Description

Technical Field

[0001] The invention relates to a light, thin, breathable and ultraviolet-proof fabric for children and a preparation process thereof. Background Art

[0002] With the development of prevention and control technology and the continuous improvement of people's living standards, people's demand for textile clothing and fabrics is no longer limited to quality and grade, but is gradually developing in the direction of personalization and differentiation. Fabrics have also evolved from the original windproof, rainproof and heat preservation to today's comfort, beauty and fashion. For summer children's clothing, not only air permeability but also sun protection performance should be considered. Due to the characteristics of children's hyperactivity, the air permeability and perspiration performance of summer children's clothing is required to be relatively high, and there are few clothes on the market that can achieve the air permeability and perspiration performance of summer children's clothing. The patent with publication number CN104432560A: waterproof and breathable fabric children's underwear that can measure human body temperature, it includes an underwear body (1), the underwear body (1) is a double-layer structure, and a sandwich layer is provided inside, the underwear body (1) is provided with an infrared thermometer (2) in the sandwich layer at the armpit position, the infrared thermometer (2) is connected to the CPU (3), and the CPU (3) is connected to the GSM module (4); the underwear body is made of fabric, the fabric is composed of a breathable bottom layer, a transition isolation layer and a waterproof surface layer, the breathable bottom layer is provided with a plurality of breathable cavities, each breathable cavity is in an inverted U shape, the transition isolation layer is provided on the breathable bottom layer, and the body of the transition isolation layer presents a regular concave-convex shape. The present invention can timely detect whether a child has symptoms of fever and cold, so that medical treatment can be timely sought. The invention has the characteristics of good elasticity, good air permeability, good waterproof effect and strong buoyancy. The patent with publication number CN111231440A: an antibacterial breathable children's fabric and a preparation method thereof, the fabric comprises two layers of base fabric distributed in the upper and lower parts, both layers of base fabric are provided with a plurality of circular through holes, the two layers of base fabric are integrated and fixed by hot pressing, and a hot pressing line is provided on the base fabric between two adjacent rows of circular through holes; the steps of the fabric preparation method are: preparing a fabric blank, preparing an antibacterial solution, preparing a base fabric, and hot pressing and integrating the two layers of base fabric to obtain an antibacterial breathable children's fabric; the fabric is improved on the basis of the fabric by selecting an antibacterial material, and the base fabric is sprayed with an antibacterial solution at the same time, so that the antibacterial breathable children's fabric has excellent antibacterial performance, the fabric not only has good air permeability, but also can prevent dust from passing through the fabric, and the design is reasonable; the fabric blank is pressed by a pressing plate to keep the fabric blank stable and ensure the opening effect. Currently, the idea of ​​increasing the breathability of children's clothing is to improve the processing or fabric combination, and it is rare to start from the yarn itself. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects existing in the prior art and provide a light, breathable and UV-proof fabric for children. The yarn is successively passed through a pulling initial shaping mechanism and a heat shaping mechanism to complete initial shaping and final shaping to form a shaped yarn with a variable cross-section. The light, breathable and UV-proof fabric for children woven with the yarn absorbs moisture and becomes farther away from the human body when the human body sweats, thereby adjusting the wearing comfort and improving the heat dissipation and perspiration discharge.

[0004] To achieve the above object, the technical scheme of the present invention is to design a light, breathable and UV-proof fabric for children, comprising a polyester cotton fiber layer, a breathable layer and a silk cotton fiber layer arranged in sequence from top to bottom; the polyester cotton fiber layer and the silk cotton fiber layer are blended and manufactured through the processes of raw fiber preparation, cleaning, carding, drawing, roving and spun yarn respectively;

[0005] The breathable layer is woven from bamboo fiber yarn;

[0006] The polyester cotton yarn and / or bamboo fiber yarn and / or silk cotton yarn in the polyester cotton fiber layer and / or silk cotton fiber layer and / or the breathable layer are polyester cotton yarn, bamboo fiber yarn and silk cotton yarn obtained by impregnating with an anti-ultraviolet impregnation liquid between the roving process and the spun yarn process;

[0007] The polyester-cotton yarn, bamboo fiber yarn and silk-cotton yarn in the polyester-cotton fiber layer, the silk-cotton fiber layer and the breathable layer are polyester-cotton yarn, bamboo fiber yarn and silk-cotton yarn that have been shaped by a yarn shaping machine after the spinning process and before the weaving process. The polyester-cotton fiber layer can be manufactured by blending the polyester-cotton into warp yarn and weft yarn respectively. The silk-cotton fiber layer is similar; the weight ratio of the polyester fiber to the cotton fiber in the specific warp yarn is 2:8-6:4, and the weight ratio of the polyester fiber to the cotton fiber in the weft yarn is 3:7-8:2; the weight ratio of the silk fiber to the cotton fiber in the specific warp yarn is 2:8-6:4, and the weight ratio of the silk fiber to the cotton fiber in the weft yarn is 3:7-7:3.

[0008] A further technical solution is that the polyester cotton yarn, bamboo fiber yarn and silk cotton yarn are variable cross-section yarns, and the cross-section shapes of the polyester cotton yarn, bamboo fiber yarn and silk cotton yarn are arranged alternately in the length direction of the yarn in the shape of oblong holes and circles; the long axis direction of the oblong hole-shaped yarn cross-section on both sides of the yarn part of the same section of circular cross-section is at a certain angle, and the angle is greater than zero and less than 180 degrees. The yarn is formed by a yarn setting machine to form a variable cross-section yarn, so that each section of the yarn has a different cross-section shape, some places are conventional circles, and some places are oblong holes. In this way, when the children wear clothes made of this fabric, some parts of the yarn are basically not in contact with the body surface, and the contacting parts will have a certain amount of moisture absorption and expansion after sweating on the body surface, which increases this situation (that is, some parts of the yarn are not in contact with the body surface). Therefore, after the children sweat, the distance between the yarns that are not in contact with the body surface and the human body is increased, and the air permeability is improved, and the sweating performance is improved.

[0009] A further technical solution is that the long axis direction of the yarn cross section of the oblong hole-shaped yarn on both sides of the length direction of the circular cross section of the yarn is vertically arranged.

[0010] The present invention also provides a technical solution for preparing a light, thin, breathable and UV-proof fabric for children, comprising the following process steps performed in sequence:

[0011] S1: Blending of raw fiber preparation, cleaning, carding, drawing, roving and spinning to obtain polyester-cotton blended fiber and silk-cotton blended fiber;

[0012] S2: subjecting polyester-cotton blended fiber, silk-cotton blended fiber and bamboo fiber yarn to a yarn setting machine for setting treatment;

[0013] A padding process of padding the polyester cotton yarn, bamboo fiber yarn and silk cotton yarn with an anti-ultraviolet padding liquid is also provided between the roving process and the spun yarn process in step S1.

[0014] A further technical solution is that the yarn setting machine includes a pulling initial setting mechanism and a heat setting mechanism which are arranged in sequence; in the step S2, the yarn passes through the pulling initial setting mechanism and the heat setting mechanism in sequence to complete initial setting and final setting to form a set yarn with a variable cross-section.

[0015] A further technical solution is that the yarn setting machine includes a frame, on which are provided a wire feeding unwinding roller, a pulling initial setting mechanism, a heat setting mechanism and a wire taking-up winding roller, and the wire feeding unwinding roller and the wire taking-up winding roller are rotatably connected to the frame;

[0016] The pulling initial shaping mechanism comprises a channel steel component box, a pair of groove side walls of the channel steel component box are rotatably provided with two rotating shafts, gears are fixedly provided on the two rotating shafts and the gears on the two rotating shafts are meshed, the rotating shafts are arranged beyond the component box and the exceeding part of one of the rotating shafts is fixedly connected to the output shaft of the reduction motor, and the reduction motor is fixedly connected to the outer side wall of the component box;

[0017] A plurality of pulling rods arranged at intervals are fixedly connected to the two rotating shafts, and adjacent pulling rods are staggered. A yarn guide drum is fixedly connected to the end of each pulling rod away from the rotating shaft. The yarn unwound from the inlet unwinding roller passes through each yarn guide drum and is wound onto the take-up winding roller. With this arrangement, adjacent pulling rods can pull the yarn in different directions, achieving the initial shaping, that is, pulling and stretching of the yarn.

[0018] A further technical solution is that the speeds of the incoming unwinding roller and the rewinding roller are inconsistent. The rewinding roller and the unwinding roller are set at a differential speed, and the pulling and initial shaping mechanism is combined to better achieve the pulling and shaping function.

[0019] A further technical solution is that the heat setting mechanism comprises a heat setting roller pair arranged on one side of each pulling rod, two heat setting rollers of the heat setting roller pair are rotatably arranged on a frame, an annular groove is arranged on the circumferential roller surface of the heat setting roller, the annular groove is arranged concentrically with the heat setting roller, and the cross-sectional shape of the annular grooves of the pair of heat setting rollers after combination is an oblong hole shape; the roller axes of adjacent heat setting roller pairs are arranged vertically;

[0020] The roller shaft of the heat setting roller pair is rotatably connected to the frame, and a roller wheel is fixedly connected to the roller shaft. A hot oil channel is provided in the center of the roller shaft, and a serpentine pipe connected to the hot oil channel is provided on the roller wheel. The heat setting roller pairs are alternately arranged and perpendicular to each other to achieve heat pressing of the yarn at intervals to achieve heat setting so that the cross section of the yarn is formed into a desired shape; in order to better implement this scheme, a gear can be fixedly set on the circumferential surface of the roller shaft of the heat setting roller pair, and a driving gear is provided through meshing with the gear, and the driving gear is fixedly connected to the output shaft of the reducer, so that the heat setting roller pair becomes an active roller, which can achieve heat pressing of the yarn while driving the yarn to enter the line to ensure the heat setting effect of the yarn.

[0021] A further technical solution is that one end of the roller shaft is arranged beyond the frame and the hot oil channel at the exceeding part is in clearance fit with the connecting pipe, and a rotating sealing ring is arranged at the clearance fit. This arrangement realizes non-interference in the rotation of the roller shaft, and also realizes the sealing of the hot oil channel of the roller shaft and the connecting pipe, ensuring that it is sealed during rotation, and ensuring that the hot oil circulates to realize hot pressing when the heat setting roller rotates.

[0022] The advantages and beneficial effects of the present invention are that the yarn is successively passed through a pulling initial shaping mechanism and a heat shaping mechanism to complete initial shaping and final shaping to form a shaped yarn with a variable cross-section, so that the children's light, breathable and UV-proof fabric woven with the yarn absorbs moisture and becomes farther away from the human body when the human body sweats, thereby adjusting the wearing comfort and improving the heat dissipation and perspiration properties.

[0023] The yarn is shaped by a yarn shaping machine to form a yarn with variable cross-section, so that each section of the yarn has a different cross-sectional shape, some places are conventional circles, and some places are oblong holes. In this way, when children wear clothes made of this fabric, some parts of the yarn basically do not contact the body surface, while the contacting parts will absorb moisture and expand to a certain extent after sweating on the body surface, which increases this situation (that is, some parts of the yarn are not in contact with the body surface). Therefore, after children sweat, the distance between those yarns that are not in contact with the body surface and the human body is increased, and the breathability is improved, and the sweat-wicking performance is improved.

[0024] The differential speed setting of the winding roller and the unwinding roller, combined with the pulling and initial shaping mechanism, can better achieve the pulling and shaping effect.

[0025] By alternately arranging heat-setting rollers that are perpendicular to each other, the yarn can be hot-pressed at intervals to achieve heat setting, so that the cross-section of the yarn is formed into a desired shape. In order to better implement this solution, gears can be fixedly arranged on the circumferential surface of the roller shaft of the heat-setting rollers, and a driving gear is provided to mesh with the gears. The driving gear is fixedly connected to the output shaft of the reducer, so that the heat-setting rollers become active rollers, which can heat-press the yarn while driving the yarn to enter, so as to ensure the heat-setting effect of the yarn.

[0026] It does not interfere with the rotation of the roller shaft, and also realizes the sealing of the hot oil channel of the roller shaft and the connecting pipe, ensuring that it is sealed during rotation, and ensuring that the circulating hot oil realizes hot pressing when the heat setting pressing roller rotates. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional schematic diagram of a light, breathable, and UV-proof fabric for children of the present invention;

[0028] Figure 2 is a schematic diagram of a yarn made according to the present invention;

[0029] Figure 3 yes Figure 2 Middle AA section view;

[0030] Figure 4 yes Figure 2 Cross-sections along BB and DD directions;

[0031] Figure 5 yes Figure 2 Cross-section along the mid-CC direction;

[0032] Figure 6 It is a schematic diagram of a shaping machine in the present invention;

[0033] Figure 7 yes Figure 6 A top view of

[0034] Figure 8 yes Figure 6 The main view of

[0035] Fig. 9 yes Figure 8 Schematic diagram after removing the body part to expose the component box;

[0036] Fig.10 yes Fig. 9 A top view of

[0037] Fig.11 yes Fig.10 Schematic diagram of the middle section of yarn;

[0038] Fig.12 yes Fig.11 A top view of a pair of heat setting rollers in the upper middle;

[0039] Fig.13 yes Fig.11 A perspective view of a medium heat setting press roll;

[0040] Fig.14 yes Fig.13 Side view of.

[0041] In the figure: 1. polyester cotton fiber layer; 2. breathable layer; 3. silk cotton fiber layer; 4. frame; 5. inlet unwinding roller; 6. take-up winding roller; 7. component box; 8. rotating shaft; 9. gear; 10. reduction motor; 11. pulling rod; 12. yarn guide cylinder; 13. heat setting pressure roller; 14. ring groove; 15. hot oil channel; 16. serpentine pipe; 17. connecting pipe. DETAILED DESCRIPTION

[0042] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0043] like Figures 1 to 14 As shown (for ease of illustration, Figure 6The wire feeding unwinding roller and the wire taking-up winding roller are not shown;), the present invention is a light, thin, breathable and UV-proof fabric for children, comprising a polyester cotton fiber layer 1, a breathable layer 2 and a silk cotton fiber layer 3 arranged in sequence from top to bottom; the polyester cotton fiber layer 1 and the silk cotton fiber layer 3 are respectively blended and manufactured through the steps of raw fiber preparation, cleaning, carding, drawing, coarse yarn and fine yarn; the breathable layer 2 is woven with bamboo fiber yarn; the polyester cotton yarn and / or bamboo fiber yarn and / or silk cotton yarn in the polyester cotton fiber layer 1 and / or the silk cotton fiber layer 3 and / or the breathable layer 2 are The polyester cotton yarn, bamboo fiber yarn and silk cotton yarn are obtained by dipping in the anti-ultraviolet impregnation liquid between the coarse yarn process and the fine yarn process (generally, the yarn used for the outer layer of the fabric is dipped in the anti-ultraviolet impregnation liquid, and there is also a method of dipping all layers from the outside to the inside in the anti-ultraviolet impregnation liquid to enhance the sun protection effect); the polyester cotton yarn, bamboo fiber yarn and silk cotton yarn in the polyester cotton fiber layer 1, the silk cotton fiber layer 3 and the breathable layer 2 are the polyester cotton yarn, bamboo fiber yarn and silk cotton yarn that have been finalized by a yarn finalizer after the fine yarn process and before the weaving process. Polyester cotton yarn, bamboo fiber yarn and silk cotton yarn are variable cross-section yarns, and the cross-section shapes of polyester cotton yarn, bamboo fiber yarn and silk cotton yarn are oblong hole-shaped and circular in sequence and arranged alternately along the length direction of the yarn; the long axis direction of the oblong hole-shaped yarn cross-section on both sides of the yarn part with a circular cross-section in the same section is at a certain angle, and the angle is greater than zero and less than 180 degrees. The long axis direction of the oblong hole-shaped yarn cross-section on both sides of the length direction of the circular cross-section yarn is arranged vertically.

[0044] The process for preparing a light, thin, breathable and UV-proof fabric for children comprises the following process steps performed in sequence:

[0045] S1: Blending of raw fiber preparation, cleaning, carding, drawing, roving and spinning to obtain polyester-cotton blended fiber and silk-cotton blended fiber;

[0046] S2: subjecting polyester-cotton blended fiber, silk-cotton blended fiber and bamboo fiber yarn to a yarn setting machine for setting treatment;

[0047] A padding process of padding the polyester cotton yarn, bamboo fiber yarn and silk cotton yarn with an anti-ultraviolet padding liquid is also provided between the roving process and the spun yarn process in step S1.

[0048] The yarn setting machine includes a pulling and initial setting mechanism and a heat setting mechanism which are arranged in sequence; in the step S2, the yarn is formed into a set yarn with a variable cross-section after the yarn is initially set and finally set by the pulling and initial setting mechanism and the heat setting mechanism in sequence. The yarn setting machine includes a frame 4, on which a wire feeding unwinding roller 5, a pulling and initial setting mechanism, a heat setting mechanism and a wire taking-up winding roller 6 are arranged, and the wire feeding unwinding roller 5 and the wire taking-up winding roller 6 are rotatably connected to the frame 4; the pulling and initial setting mechanism includes a channel steel component box 7, on which a pair of groove side walls of the channel steel component box 7 are rotatably provided with two rotating shafts 8, on which gears 9 are fixedly provided and the gears 9 on the two rotating shafts 8 are meshed, and the rotating shafts 8 are arranged beyond the component box 7 and the exceeding part of one of the rotating shafts 8 is connected to the reduction motor. The output shafts of the machine 10 are fixedly connected, and the reduction motor 10 is fixedly connected to the outer wall of the component box 7; a plurality of spaced pulling rods 11 are fixedly connected to the two rotating shafts 8, and adjacent pulling rods 11 are staggered, and each pulling rod 11 is fixedly connected to a yarn guide cylinder 12 at one end away from the rotating shaft 8 (a tube mouth of the yarn guide cylinder 12 can be set to a trumpet shape in the prior art to facilitate better yarn guiding), and the yarn unwound from the incoming unwinding roller 5 passes through each yarn guide cylinder 12 and is wound onto the take-up winding roller 6. The rotation speeds of the incoming unwinding roller 5 and the take-up winding roller 6 are inconsistent. The heat setting mechanism comprises a heat setting roller pair arranged on one side of each pulling rod 11, two heat setting rollers 13 of the heat setting roller pair are rotatably arranged on the frame 4, an annular groove 14 is arranged on the circumferential roller surface of the heat setting roller 13, the annular groove 14 is arranged concentrically with the heat setting roller 13, and the cross-sectional shape of the annular groove 14 of a pair of heat setting rollers 13 after combination is an oblong hole shape; the roller shafts of adjacent heat setting roller pairs are arranged vertically; the roller shafts of the heat setting roller pairs are rotatably connected to the frame 4, a roller wheel is fixedly connected to the roller shaft, a hot oil channel 15 is arranged in the center of the roller shaft, and a serpentine pipe 16 connected to the hot oil channel 15 is arranged on the roller wheel. One end of the roller shaft is arranged beyond the frame 4, and the hot oil channel 15 at the exceeding part is gap-matched with the connecting pipe 17, and a rotating sealing ring is arranged at the gap-matching position.

[0049] The working principle of the present invention is as follows:

[0050] The yarn unwound from the unwinding roller passes through the yarn guide cylinder at the upper end of each pulling rod until it is wound onto the winding roller. When it needs to be shaped, the reduction motor (a servo motor can also be used to ensure that the rotation angle is accurately controlled) is driven and started for a period of time (so that the shaft rotates a certain angle), so that the two shafts rotate in opposite directions (due to gear meshing), and each pulling rod swings in opposite directions (such as Fig.10As shown in the figure, hot oil is pumped into the hot oil channel in the center of the roller shaft of the pressure roller through the oil storage tank and the oil pump via the connecting pipe, and the heat-setting pressure roller is driven by its reduction motor to drive the yarn forward to complete the heat setting. Moreover, since the roller shafts of adjacent heat-setting rollers are arranged vertically, the cross-sectional shapes of different sections of the yarn after setting are different, and the variable cross-section of the yarn after setting is achieved, thereby enhancing the air permeability and perspiration discharge of the yarn after it is woven into a fabric.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A light, breathable, UV-proof fabric for children, characterized in that: It includes a polyester cotton fiber layer, a breathable layer and a silk cotton fiber layer arranged in sequence from top to bottom; the polyester cotton fiber layer, the breathable layer and the silk cotton fiber layer are blended and manufactured through the processes of raw fiber preparation, cleaning, carding, drawing, roving and spinning respectively; The breathable layer is woven from bamboo fiber yarn; The polyester cotton yarn and / or bamboo fiber yarn and / or silk cotton yarn in the polyester cotton fiber layer and / or silk cotton fiber layer and / or the breathable layer are polyester cotton yarn, bamboo fiber yarn and silk cotton yarn obtained by impregnating with an anti-ultraviolet impregnation liquid between the roving process and the spun yarn process; The polyester cotton yarn, bamboo fiber yarn and silk cotton yarn in the polyester cotton fiber layer, the silk cotton fiber layer and the breathable layer are polyester cotton yarn, bamboo fiber yarn and silk cotton yarn that have been shaped by a yarn shaping machine after the spinning process and before the weaving process; The polyester cotton yarn, bamboo fiber yarn and silk cotton yarn are variable-section yarns, and the cross-sectional shapes of the polyester cotton yarn, bamboo fiber yarn and silk cotton yarn are oblong hole-shaped and circular in an alternating manner along the length direction of the yarn; the long axis directions of the oblong hole-shaped yarn cross-sections on both sides of the yarn portion of the same circular cross-section are arranged at a certain angle, and the angle is greater than zero and less than 180 degrees; The polyester-cotton fiber layer is manufactured by blending polyester-cotton into warp yarn and weft yarn respectively; the weight ratio of polyester fiber to cotton fiber in the warp yarn is 2:8-6:4, and the weight ratio of polyester fiber to cotton fiber in the weft yarn is 3:7-8:2; the silk-cotton fiber layer is manufactured by blending silk-cotton into warp yarn and weft yarn respectively, the weight ratio of silk fiber to cotton fiber in the warp yarn is 2:8-6:4, and the weight ratio of silk fiber to cotton fiber in the weft yarn is 3:7-7:

3.

2. A light, breathable, UV-proof fabric for children according to claim 1, characterized in that: The long axis directions of the oblong hole-shaped yarn sections on both sides of the yarn portion with the same circular cross section are arranged vertically.

3. A process for preparing the light, breathable and UV-proof fabric for children as claimed in any one of claims 1 to 2, characterized in that: The process comprises the following steps which are carried out in sequence: S1: Blending of raw fiber preparation, cleaning, carding, drawing, roving and spinning to produce polyester cotton yarn, bamboo fiber yarn and silk cotton yarn; S2: subjecting the polyester cotton yarn, the silk cotton yarn and the bamboo fiber yarn to a setting treatment by a yarn setting machine; A padding process of padding the polyester cotton yarn, bamboo fiber yarn and silk cotton yarn with an anti-ultraviolet padding liquid is also provided between the roving process and the spun yarn process in step S1.

4. The preparation process of a light, breathable and UV-proof fabric for children according to claim 3, characterized in that: The yarn setting machine comprises a pulling initial setting mechanism and a heat setting mechanism which are arranged in sequence; in the step S2, the yarn is sequentially passed through the pulling initial setting mechanism and the heat setting mechanism to complete initial setting and final setting to form a set yarn with a variable cross-section.

5. The process for preparing a light, breathable and UV-proof fabric for children according to claim 4, characterized in that: The yarn setting machine comprises a frame, on which are arranged a wire feeding unwinding roller, a pulling initial setting mechanism, a heat setting mechanism and a wire taking-up winding roller, and the wire feeding unwinding roller and the wire taking-up winding roller are rotatably connected to the frame; The pulling initial shaping mechanism comprises a channel steel component box, a pair of groove side walls of the channel steel component box are rotatably provided with two rotating shafts, gears are fixedly provided on the two rotating shafts and the gears on the two rotating shafts are meshed, the rotating shafts are arranged beyond the component box and the exceeding part of one of the rotating shafts is fixedly connected to the output shaft of the reduction motor, and the reduction motor is fixedly connected to the outer side wall of the component box; A plurality of pulling rods arranged at intervals are fixedly connected to the two rotating shafts, and adjacent pulling rods are staggered. One end of each pulling rod away from the rotating shaft is fixedly connected to a yarn guide drum. The yarn unwound from the incoming unwinding roller passes through each yarn guide drum and is wound onto the take-up winding roller.

6. The process for preparing a light, breathable, UV-proof fabric for children according to claim 5, characterized in that: The rotation speeds of the wire feeding unwinding roller and the wire taking-up winding roller are inconsistent.

7. The process for preparing a light, breathable and UV-proof fabric for children according to claim 6, characterized in that: The heat setting mechanism comprises a pair of heat setting rollers arranged on one side of each pulling rod, two heat setting rollers of the heat setting rollers are rotatably arranged on a frame, an annular groove is arranged on the circumferential roller surface of the heat setting roller, the annular groove is arranged concentrically with the heat setting roller, and the cross-sectional shape of the annular grooves of the pair of heat setting rollers after combination is an oblong hole shape; the roller axes of adjacent heat setting rollers are arranged vertically; The roller shaft of the heat setting roller pair is rotatably connected to the frame, a roller wheel is fixedly connected to the roller shaft, a hot oil channel is arranged at the center of the roller shaft, and a serpentine pipeline connected to the hot oil channel is arranged on the roller wheel.

8. The process for preparing a light, breathable, UV-proof fabric for children according to claim 7, characterized in that: One end of the roller shaft is arranged beyond the frame, and the hot oil channel at the exceeding part is clearance-matched with the connecting pipe, and a rotating sealing ring is arranged at the clearance-matched part.

Images