Variable-diameter bobbin for supercritical waterless dyeing and use method of variable-diameter bobbin

Abstract

The variable-diameter bobbin for supercritical waterless dyeing comprises a stainless steel bobbin body provided with a through hole, and is characterized in that the stainless steel bobbin body comprises a long-strip-shaped stainless steel sheet, the long-strip-shaped stainless steel sheet comprises a middle section, an insertion section and an insertion section, and the insertion section and the insertion section are connected to the two ends of the middle section; the inserting section and the inserting section are correspondingly provided with matched inserting structures, the long-strip-shaped stainless steel sheet is curled, and the inserting section and the inserting section are connected in an overlapped and inserted mode to form the elastic reducing cylindrical bobbin. The insertion section, the middle section and the insertion section are consistent in width, the insertion section is provided with a convex strip or a groove in the length direction, the insertion section is correspondingly provided with a groove or a convex strip in the length direction, and a sliding insertion structure is formed through insertion of the convex strip and the groove. The bobbin automatically adjusts the perimeter along with the shrinkage of yarns, can reduce the difference between the shrinkage rates of the yarns on the inner layer and the outer layer, and has the advantages of simple structure, convenience in processing and manufacturing, lower cost and convenience and reliability in use; the application method can be used for measuring the yarn shrinkage rate.

Description

Technical Field

[0001] The invention belongs to the technical field of dyeing equipment, in particular to a variable diameter yarn tube for supercritical waterless dyeing and a use method thereof. Background Art

[0002] Supercritical carbon dioxide dyeing technology is an emerging green dyeing technology. This technology has the advantages of high efficiency, no pollution, and short dyeing time. It is the development direction of dyeing technology in the future.

[0003] This technology uses supercritical CO 2 As dyeing medium, dyeing equipment usually includes a dye kettle, a dyeing tank and a supercritical CO2 connecting the dye kettle and the dyeing tank. 2 The dye is placed in the dye kettle, and the dyed material is placed in the dyeing tank. 2 When heated to above 31°C and the pressure exceeds 7.3MPa, it becomes a state that is neither gas nor liquid - the supercritical state. The supercritical CO 2 The dye in the dye tank is pressurized into the guide tube so that it circulates continuously between the dye tank and the dye tank. The dye in the dye tank is heated by supercritical CO 2 dissolves and reacts with supercritical CO 2 The dye is transported to the pores between the fibers in the dyeing tank, so that the dye can be evenly and quickly dyed onto the fabric (or yarn). The whole process does not require cleaning or drying. Currently, many countries are working hard to develop this supercritical CO 2 Waterless dyeing equipment makes it develop towards industrialization.

[0004] With the deepening of research on supercritical dyeing, it is found that the common round dyeing tubes traditionally used for water dyeing are no longer suitable for supercritical waterless dyeing. In order to meet the needs of supercritical waterless dyeing, the Chinese patent (application number: 202222833632.9) discloses a yarn dyeing tube suitable for supercritical dyeing kettle. It includes a cylinder, a through hole and a notch. The two ends of the cylinder are provided with notches. A plurality of through holes are provided on the cylinder by drilling the tube surface. The plurality of through holes form a large number of hollow areas, and the hollow area accounts for 60%-80% of the surface area of ​​the outer wall of the cylinder. By optimizing the structure, notches are provided on the structure at both ends of the yarn tube, and the corresponding size and shape of the gasket are matched to improve the sealing of the yarn tube during installation and placement. The material is selected from chromium-nickel alloy metal material, which can further improve the high pressure resistance of the dyeing tube, thereby stably realizing the supercritical carbon dioxide fluid dyeing process. The large-area hollowing further improves the flux of the yarn dyeing tube. The yarn dyeing tube under the above flux can ensure the effective circulation efficiency of the dye solution and the uniformity of the yarn in the supercritical carbon dioxide fluid yarn dyeing process.

[0005] Although the yarn dyeing tube of the above patent is improved over the ordinary round dyeing tube, it also basically meets the needs of supercritical fluid dyeing. However, the diameter of the yarn dyeing tube of the above patent is fixed. Due to the high temperature and high pressure in the supercritical fluid dyeing process, the yarn shrinkage rate is higher than that in the traditional water dyeing process. The difference in shrinkage rate of the inner and outer layers causes defects such as color difference of the dyed yarn, causing quality problems. The Chinese patent (application number: 01233574) also discloses a variable diameter bobbin, which is composed of several long arc pieces with perforations, in an inner and outer double-layer active overlapping manner to form a cylindrical or conical shape, and a positioning column and an arc guide column are provided on the inner edge of the outer arc piece, and a fulcrum of a torsion spring is fixed to the positioning column, and the two movable ends of the torsion spring are respectively fixed to the inner arc pieces on both sides, and arc guide tubes are provided on the inner arc pieces on both sides relative to the arc guide column. The diameter of the tube can be automatically adjusted according to the internal shrinkage force of the yarn, balancing the shrinkage force of the inner and outer yarns, and can easily solve the color difference between the inner and outer layers during dyeing. The variable diameter bobbin of the patent basically solves the problem of color difference between the inner and outer layers during dyeing of the dyeing tube. However, it uses many parts and has a complex structure and shape, which makes processing and assembly inconvenient, the production cost is high, and it is easy to damage, which is not suitable for large-scale promotion and application.

[0006] In addition, the Chinese patent (application number: 01233574) does not have a scale, so it is not possible to timely determine the change in bobbin diameter or the shrinkage rate of the yarn after dyeing.

[0007] How to design a variable diameter yarn tube for supercritical waterless dyeing and its use method, which can not only realize the automatic variable diameter of the yarn tube and reduce the difference in shrinkage rate of the inner and outer layers of yarn, but also has the advantages of simple structure, convenient processing and manufacturing, low cost, flexible and reliable diameter change. This is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0008] In order to solve the above problems existing in the prior art, the present invention provides a variable diameter yarn tube for supercritical waterless dyeing and a method for using the same. The yarn tube adopts an integrated structure, and its circumference is automatically adjusted as the yarn shrinks, thereby reducing the difference in shrinkage rates of the inner and outer yarn layers. The yarn tube has the characteristics of simple structure, convenient processing and manufacturing, low cost, and easy and reliable use.

[0009] The objective of the present invention is achieved through the following technical solutions: A variable diameter yarn tube for supercritical waterless dyeing comprises a stainless steel yarn tube body, on which a through hole is arranged, and is characterized in that the stainless steel yarn tube body comprises a long strip of stainless steel sheet, the long strip of stainless steel sheet comprises a middle section and an insertion section and a plug-in section connected at both ends thereof, matching plug-in structures are correspondingly arranged on the insertion section and the plug-in section, the long strip of stainless steel sheet is curled, and the insertion section and the plug-in section are overlapped and plugged to form an elastically variable diameter cylindrical yarn tube.

[0010] The first improvement to the above technical solution: the insertion section, the middle section and the plug-in section have the same width, the insertion section is provided with ridges or grooves along the length direction, and the plug-in section is provided with corresponding grooves or ridges along the length direction, and the insertion section and the plug-in section are plugged into each other through the ridges and grooves to form a sliding plug-in structure.

[0011] The second improvement to the above technical solution: the middle section is a rectangle, and its width is smaller than the plug-in section and the insertion section. Two side edges of the plug-in section form two slots, and the slots are U-shaped grooves formed by bending the side edges of the plug-in section twice. The openings of the two U-shaped grooves are arranged opposite to each other, and the spacing between the bottoms of the two slots is consistent with the width of the insertion section. The end of the insertion section is curled into a cylindrical shaft, and a rotating wheel is arranged on each end of the cylindrical shaft. The two rotating wheels are respectively placed in the slots on the corresponding side to form a rotating plug-in structure.

[0012] The third improvement to the above technical solution: the middle section is rectangular, and its width is smaller than that of the plug-in section. Two side edges of the plug-in section form two slots. The slots are U-shaped grooves formed by bending the side edges of the plug-in section twice. The openings of the two U-shaped grooves are arranged opposite to each other. The spacing between the bottoms of the two slots is consistent with the width of the middle section. The two side edges of the insertion section are respectively embedded in the slots on the corresponding side to form a plug-in structure with elastically variable diameter of the yarn tube.

[0013] Further improvement to the above technical solution: the slot on the plug-in section includes a first bending surface and a second bending surface, the second bending surface is vertically connected to the plug-in section, the first bending surface is vertically connected to the second bending surface, and the first bending surface is parallel to the plug-in section.

[0014] Further improvement of the above technical solution: the width of the insertion section is smaller than the width of the middle section, a support rod is arranged at the end of the insertion section, the length of the support rod is equal to or smaller than the width of the middle section, both ends of the support rod are placed in the slot on the corresponding side, and an observation window and a scale are arranged on the second bending surface or the first bending surface.

[0015] Further improvement of the above technical solution: at least two parallel elongated slots are arranged along the length direction from the middle section to the plug-in section, and the elongated slot is located on the plug-in section at one end and is a large semicircular hole. At least two fixing columns are fixedly connected to the insertion section corresponding to the elongated slot, and a steel ball is arranged on the top of the fixing column. The diameter of the steel ball is larger than the width of the elongated slot and smaller than the diameter of the large semicircular hole. The steel ball passes through the large semicircular hole at one end of the elongated slot, so that the fixing column slides in the elongated slot, thereby realizing elastic diameter change of the yarn tube within a limited range.

[0016] Further improvement to the above technical solution: the width of the insertion section is less than or equal to the width of the middle section, the insertion section forms a wave shape along the length direction, and the distance between the wave crest and the wave trough of the wave shape is less than the slot width of the slot.

[0017] Further improvement to the above technical solution: an introduction section is extended along the end edge of the plug-in section, and the width of the introduction section is consistent with the width of the middle section.

[0018] The present invention provides a method for using the variable diameter yarn tube for supercritical waterless dyeing, characterized in that the method comprises the following steps: Step S1: plugging variable diameter yarn tubes for supercritical waterless dyeing into a cylindrical shape; Step S2: clamping the variable diameter yarn tube rolled into a cylindrical shape on the chuck of the winding machine, and completing the winding according to the set process; Step S3: Before dyeing, observe the circumference data of the yarn tube indicated by the end of the support rod in the window and make a record; Step S4: placing the yarn tube fully wound with yarn into a supercritical waterless dyeing kettle for dyeing; Step S5: After the dyed yarn tube is taken out, the yarn tube circumference data indicated by the end of the yarn tube support rod after dyeing is observed from the observation window and recorded; Step S6: directly calculating the shrinkage rate of the yarn after dyeing according to the change in the yarn tube diameter before and after dyeing.

[0019] Compared with the prior art, the present invention has the following advantages and positive effects: 1. The present invention adopts an integrated cylindrical yarn tube formed by curling a long stainless steel sheet and staggered plugging at both ends. The yarn tube automatically adjusts its own diameter as the yarn shrinks, reducing the difference in dyeing shrinkage rate between the inner and outer layers of yarn, and improving various indicators such as dyeing layer difference. It has the characteristics of simple structure, convenient processing and manufacturing, low cost, easy use and reliability;

[0020] 2. The present invention provides an observation window and a scale on the side of the slot of the plug-in section, so as to facilitate timely in-situ observation of the circumference change of the yarn tube before and after dyeing and calculate the shrinkage rate of the yarn after dyeing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a plan view of a variable diameter yarn tube embodiment 1 for supercritical waterless dyeing of the present invention; Figure 2 yes Figure 1 Bottom view of Figure 3 This is a front view of a variable diameter yarn tube embodiment 1 for supercritical waterless dyeing of the present invention; Figure 4 This is an enlarged top view of a variable diameter yarn tube for supercritical waterless dyeing according to the present invention, Example 1; Figure 5 yes Figure 4 A partial enlarged view of the top surface of the middle slot; Figure 6 yes Figure 4 AA section view; Figure 7 It is a plan view of a variable diameter yarn tube embodiment 2 for supercritical waterless dyeing of the present invention; Figure 8 yes Figure 7 Bottom view of Fig. 9 This is a front view of a variable diameter yarn tube embodiment 2 for supercritical waterless dyeing of the present invention; Fig.10 This is an enlarged top view of a variable diameter yarn tube for supercritical waterless dyeing according to Embodiment 2 of the present invention; Fig.11 This is a plan view of a variable diameter yarn tube for supercritical waterless dyeing according to embodiment 3 of the present invention; Fig.12 yes Fig.11 Bottom view of .

[0022] Fig.13 It is a plan view of a variable diameter yarn tube embodiment 5 for supercritical waterless dyeing of the present invention; Fig.14 yes Fig.13 Bottom view of Fig.15 It is a plan view of a variable diameter yarn tube embodiment 6 for supercritical waterless dyeing of the present invention; Fig.16 yes Fig.15 Bottom view of .

[0023] In the figure, 1. support rod; 2. insertion section; 2.1. convex strip; 2.2. cylindrical shaft; 3. round through hole; 4. middle section; 5. plug-in section; 5.1. first bending surface; 5.2. second bending surface; 5.2.1. observation window; 5.2.2. scale; 5.3. groove; 6. introduction section; 7. large semicircular hole; 8. slender slot hole; 9. steel ball; 10. long round through hole; 11. fixing column; 12. rotating wheel. DETAILED DESCRIPTION

[0024] The present invention discloses a specific implementation of a variable diameter yarn tube for supercritical waterless dyeing, comprising a stainless steel yarn tube body, on which a through hole is arranged, and is characterized in that the stainless steel yarn tube body comprises a long strip of stainless steel sheet, the long strip of stainless steel sheet comprises a middle section and an insertion section and a plug-in section connected at both ends thereof, the insertion section and the plug-in section are provided with corresponding matching plug-in structures, the long strip of stainless steel sheet is curled, and the insertion section and the plug-in section are overlapped and plugged to form an elastically variable diameter cylindrical yarn tube.

[0025] See also Figure 1-Figure 6 , Embodiment 1 of a variable diameter yarn tube for supercritical waterless dyeing of the present invention comprises a stainless steel yarn tube body, a through hole is arranged on the stainless steel yarn tube body, the stainless steel yarn tube body is a long strip of stainless steel sheet, the long strip of stainless steel sheet comprises a middle section 4 and an insertion section 2 and a plug-in section 5 connected at both ends thereof, the middle section 4 is rectangular, and its width is smaller than the plug-in section 5. Two slots are formed on both sides of the plug-in section 5, the slots are U-shaped slots formed by bending the side of the plug-in section 5 twice, the openings of the two U-shaped slots are arranged oppositely, and the spacing between the bottoms of the two slots is consistent with the width of the middle section 4. The two side edges of the insertion section 2 are respectively embedded in the slots on the corresponding side to form a plug-in structure with elastic variable diameter of the yarn tube.

[0026] Specifically, the side edge of the plug section 5 includes a first bending surface 5.1 and a second bending surface 5.2. Figure 1 The first bending surface 5.1 and the second bending surface 5.2 are first bent 90° together, so that the first bending surface 5.1 and the second bending surface 5.2 are perpendicular to the middle part of the plug-in section 5, and then the first bending surface 5.1 is bent inward 90° along the dotted line between the first bending surface 5.1 and the second bending surface 5.2, so that the first bending surface 5.1 and the second bending surface 5.2 are perpendicular. After the two sides of the plug-in section 5 are bent twice, two slots extending along the length direction are formed, such as Figure 1 , Figure 4 shown.

[0027] Furthermore, an observation window 5.2.1 is provided on the second bending surface 5.2, and a scale 5.2.2 is provided on the outer side of the second bending surface 5.2 near the observation window 5.2.1, and the scale on the scale 5.2.2 indicates the circumference of the bobbin. The width of the insertion section 2 is smaller than the width of the middle section 4, and a support rod 1 is provided at the end of the insertion section 2, and the length of the support rod 1 is equal to or smaller than the width of the middle section 4. When the insertion section 2 is inserted into the two slots of the plug-in section 5, the positions of the two ends of the support rod 1 can be observed in the observation window 5.2.1, and the center of the end of the support rod 1 ( Figure 5 The scale on the scale 5.2.2 that is aligned with the position indicated by the upper corner of the middle triangle is the circumference of the yarn tube. By observing the circumference of the yarn tube before and after dyeing, the shrinkage rate of the yarn after dyeing can be quickly determined.

[0028] The through hole on the stainless steel yarn tube body in Example 1 can be a round through hole 3, or can be replaced by an oblong through hole 10, a square hole or a triangular hole, etc., and the oblong through hole 10 can be arranged obliquely.

[0029] See also Figure 7-10 Embodiment 2 of a variable diameter yarn tube for supercritical waterless dyeing of the present invention has a main structure substantially the same as that of Embodiment 1. The differences are as follows: The insertion section 2 of Example 2 is no longer provided with a support rod 1, and the observation window 5.2.1 and the scale 5.2.2 are no longer provided on the slot of the plug-in section 5. The insertion section 2 of Example 2 forms a wave shape along the length direction, and the spacing between the wave crests and the wave troughs of the wave shape is smaller than the slot width of the slot on both sides of the plug-in section 5, which can reduce the friction of the insertion section 2 in the slot and prevent the insertion section 2 from shaking too much in the slot.

[0030] In order to better introduce the insertion section 2, an introduction section 6 is extended at the end edge of the plug section 5, and the width of the introduction section 11 is consistent with the width of the middle section 4. Preferably, the introduction section 6 can be arc-shaped or wavy.

[0031] The through hole on the stainless steel yarn tube body in Example 2 can be a round through hole 3, or can be replaced by an oblong through hole 10, a square hole or a triangular hole, etc., and the oblong through hole 10 can be arranged obliquely.

[0032] See also Fig.11 , Fig.12 Embodiment 3 of a variable diameter yarn tube for supercritical waterless dyeing of the present invention has a main structure substantially the same as that of Embodiment 1. The differences are as follows: The insertion section 2 of Example 3 is no longer provided with a support rod 1, and the slot of the plug-in section 5 is no longer provided with an observation window 5.2.1 and a scale 5.2.2. The width of the insertion section 2 of Example 3 is consistent with the width of the middle section 4. At least two slender slots 8 are arranged in parallel along the length direction from the middle section 4 to the plug-in section 5. The slender slot 8 is located on the plug-in section 5. The end is a large semicircular hole 7. At least two fixing columns 11 are fixedly connected to the corresponding slender slots 8 on the insertion section 2. A steel ball 9 is arranged at the top of the fixing column 11. The diameter of the steel ball 9 is larger than the width of the slender slot 8 and smaller than the diameter of the large semicircular hole 7. The steel ball 9 passes through the large semicircular hole 7 at one end of the slender slot 8, so that the fixing column 11 slides in the slender slot 8, so that the diameter of the yarn tube changes within a limited range, and it will not automatically pop open when there is no yarn binding.

[0033] Preferably, the through holes on the long strip stainless steel sheet in embodiment 3 are a plurality of obliquely arranged long round through holes 10. Of course, circular holes, square holes or triangular holes may also be used.

[0034] The present invention can also remove the two slots on the splicing section 5 in Example 3 (not shown) to make the splicing section 5 and the middle section 4 have the same width, while keeping other parts unchanged, as Example 4 of the variable diameter yarn tube for supercritical waterless dyeing of the present invention.

[0035] See also Fig.13 , Fig.14 , Embodiment 5 of a variable diameter yarn tube for supercritical waterless dyeing of the present invention comprises a stainless steel yarn tube body, a through hole is arranged on the stainless steel yarn tube body, the stainless steel yarn tube body comprises a long strip of stainless steel sheet, the long strip of stainless steel sheet comprises a middle section 4 and an insertion section 2 and a plug-in section 5 connected at both ends thereof, the middle section 4 is rectangular, and its width is smaller than the plug-in section 2 and the insertion section 5, and two slots are formed on both sides of the plug-in section 5, and the slots are basically the same as those in Embodiment 3, so they are not described again. The end of the insertion section 2 is curled into a cylindrical shaft 2.2, and a rotating wheel 12 is arranged on each end of the cylindrical shaft 2.2, and the two rotating wheels 12 are respectively placed in the slots on the corresponding side of the plug-in section 5 to form a rotating plug-in structure.

[0036] Preferably, the through holes on the long strip stainless steel sheet in embodiment 5 are a plurality of round through holes 3. Of course, long round through holes 10, square holes or triangular holes may also be used.

[0037] See also Fig.15 , Fig.16, Embodiment 6 of a variable diameter yarn tube for supercritical waterless dyeing of the present invention comprises a stainless steel yarn tube body, a through hole is arranged on the stainless steel yarn tube body, the stainless steel yarn tube body comprises a long strip of stainless steel sheet, the long strip of stainless steel sheet comprises a middle section 4 and an insertion section 2 and a plug-in section 5 connected at both ends thereof, the insertion section 2, the middle section 4 and the plug-in section 5 have the same width, a convex strip 2.1 is arranged along the length direction of the insertion section 2, and a matching groove 5.3 is correspondingly arranged on the plug-in section 5, the long strip of stainless steel sheet is curled, and the insertion section 2 and the plug-in section 5 are plugged in through the convex strip 2.1 and the groove 5.3 to complete the sliding plug-in structure, thereby forming an elastically variable diameter cylindrical yarn tube.

[0038] Specifically, the convex strips 2.1 on the insertion section 2 can be three convex strips 2.1 formed by stamping, or three metal strips welded on the surface of the insertion section 2. The grooves 5.3 on the plug section 5 can be three grooves 5.3 formed by stamping, or three long notches cut. The three convex strips 2.1 are respectively inserted into the three grooves 5.3 to form a sliding connection structure. The through holes on the stainless steel bobbin body are evenly arranged, and the through holes can be oblong through holes 10 or round through holes 3, and the oblong through holes 10 can be inclined.

[0039] See also Figure 1-Figure 6 The present invention provides a method for using the variable diameter yarn tube for supercritical waterless dyeing, the method comprising the following steps: Step S1: plugging variable diameter yarn tubes for supercritical waterless dyeing into a cylindrical shape; Step S2: clamping the variable diameter yarn tube rolled into a cylindrical shape on the chuck of the winding machine, and completing the winding according to the set process; Step S3: Before dyeing, observe the yarn tube circumference data indicated by the end of the support rod 1 in the window 5.2.1 and make a record; Step S4: placing the yarn tube fully wound with yarn into a supercritical waterless dyeing kettle for dyeing; Step S5: After the dyed yarn tube is taken out, the yarn tube circumference data indicated by the end of the dyed yarn tube support rod 1 is observed from the observation window 5.2.1 and recorded; Step S6: directly calculating the shrinkage rate of the yarn after dyeing according to the change in the yarn tube diameter before and after dyeing.

[0040] The yarn tube of the present invention has good support for the yarn. When the yarn tube is wound, the yarn can be smoothly wound onto the yarn tube in a traditional water-dyeing manner. The diameter of the yarn tube can match the inner tube of any winding machine without customizing the diameter.

[0041] During the dyeing process, the yarn shrinks due to the high temperature and high pressure, and the staggered part of the yarn tube is squeezed by the yarn and produces relative displacement. Due to the limitation of the slot, the yarn tube reduces the tube diameter and reduces the tension on the inner yarn. Therefore, the same shrinkage rate as the outer yarn is obtained.

[0042] The winding tube designed by the present invention is clamped on the winding machine, and the winding is performed according to the set process, and the density is set to 400g / dm 3 The winding thickness is 4cm and the tension is 1.5N. The yarn after winding is dyed with a small sample machine. After dyeing, the yarn is reversed for internal and external weaving experiments to see the internal and external layer difference data.

[0043] The shrinkage rate of the inner and outer fixed-length yarns was measured by weighing method.

[0044] Table 1 below is a comparison of the inner and outer layer data of yarn dyeing using the circumference self-adjusting bobbin of the present invention and the traditional bobbin: Table 1

[0045] The applicant also measured the K / S value of the dyed yarn, and the comparison of the dyed inner and outer layer data is shown in Table 2: Table 2 Dyes using the same 1% owf concentration of disperse red

[0046]

[0047] Table 3 shows the color difference / grade comparison and elasticity comparison data of the yarn dyed by the self-adjusting yarn tube and the traditional water-dyed yarn: Table 3

[0048] The above data show that the yarn tube of the present invention has obvious advantages over the traditional water-dyed yarn tube in terms of the color difference inside, inside and outside of the yarn.

[0049] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A variable diameter yarn tube for supercritical waterless dyeing, comprising a stainless steel yarn tube body, a through hole is arranged on the stainless steel yarn tube body, characterized in that: The stainless steel yarn tube body comprises a long strip of stainless steel sheet, which comprises a middle section and an insertion section and a plug-in section connected at both ends thereof, wherein the insertion section and the plug-in section are provided with corresponding matching plug-in structures, and the long strip of stainless steel sheet is curled, and the insertion section and the plug-in section are overlapped and plugged to form an elastically variable diameter cylindrical yarn tube.

2. The variable diameter bobbin for supercritical waterless dyeing according to claim 1, characterized in that: The insertion section, the middle section and the plug-in section have the same width. The insertion section is provided with convex strips or grooves along the length direction, and the plug-in section is correspondingly provided with grooves or convex strips along the length direction. The insertion section and the plug-in section are plugged into each other through the convex strips and grooves to form a sliding plug-in structure.

3. The variable diameter bobbin for supercritical waterless dyeing according to claim 1, characterized in that: The middle section is rectangular, and its width is smaller than the plug-in section and the insertion section. Two slots are formed on both sides of the plug-in section. The slots are U-shaped grooves formed by bending the side of the plug-in section twice. The openings of the two U-shaped grooves are arranged opposite to each other. The spacing between the bottoms of the two slots is consistent with the width of the insertion section. The end of the insertion section is curled into a cylindrical shaft, and a rotating wheel is arranged on each end of the cylindrical shaft. The two rotating wheels are respectively placed in the slots on the corresponding side to form a rotating plug-in structure.

4. The variable diameter bobbin for supercritical waterless dyeing according to claim 1, characterized in that: The middle section is rectangular, and its width is smaller than that of the plug-in section. Two slots are formed on both side edges of the plug-in section. The slots are U-shaped slots formed by bending the side edges of the plug-in section twice. The openings of the two U-shaped slots are arranged opposite to each other. The spacing between the bottoms of the two slots is consistent with the width of the middle section. The two side edges of the insertion section are respectively embedded in the slots on the corresponding side to form a plug-in structure with elastically variable diameter of the yarn tube.

5. The variable diameter bobbin for supercritical waterless dyeing according to claim 4, characterized in that: The slot on the plug-in section includes a first bending surface and a second bending surface, the second bending surface is vertically connected to the plug-in section, the first bending surface is vertically connected to the second bending surface, and the first bending surface is parallel to the plug-in section.

6. The variable diameter bobbin for supercritical waterless dyeing according to claim 5, characterized in that: The width of the insertion section is smaller than the width of the middle section, a support rod is arranged at the end of the insertion section, the length of the support rod is equal to or smaller than the width of the middle section, both ends of the support rod are placed in the slot on the corresponding side, and an observation window and a scale are arranged on the second bending surface or the first bending surface.

7. The variable diameter bobbin for supercritical waterless dyeing according to claim 1 or 4, characterized in that: At least two parallel elongated slots are arranged along the length direction from the middle section to the plug-in section, and one end of the elongated slot is a large semicircular hole. At least two fixing columns are fixedly connected to the insertion section corresponding to the elongated slots, and a steel ball is arranged on the top of the fixing column. The diameter of the steel ball is larger than the width of the elongated slot and smaller than the diameter of the large semicircular hole. The steel ball passes through the large semicircular hole at one end of the elongated slot, so that the fixing column slides in the elongated slot, thereby realizing elastic diameter change of the yarn tube within a limited range.

8. The variable diameter bobbin for supercritical waterless dyeing according to claim 4 or 5, characterized in that: The width of the insertion section is less than or equal to the width of the middle section. The insertion section forms a wave shape along the length direction. The distance between the wave crest and the wave trough of the wave shape is less than the notch width of the slot.

9. The variable diameter bobbin for supercritical waterless dyeing according to claim 8, characterized in that: An introduction section is extended along the end edge of the plug-in section, and the width of the introduction section is consistent with the width of the middle section.

10. A method for using the variable diameter yarn tube for supercritical waterless dyeing as claimed in claim 6, characterized in that: The method of use comprises the following steps: Step S1: plugging variable diameter yarn tubes for supercritical waterless dyeing into a cylindrical shape; Step S2: clamping the variable diameter yarn tube rolled into a cylindrical shape on the chuck of the winding machine, and completing the winding according to the set process; Step S3: Before dyeing, observe the circumference data of the yarn tube indicated by the end of the support rod in the window and make a record; Step S4: placing the yarn tube fully wound with yarn into a supercritical waterless dyeing kettle for dyeing; Step S5: After the dyed yarn tube is taken out, the yarn tube circumference data indicated by the end of the yarn tube support rod after dyeing is observed from the observation window and recorded; Step S6: directly calculating the shrinkage rate of the yarn after dyeing according to the change in the yarn tube diameter before and after dyeing.

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