Yarn having natural cellulose

Abstract

A yarn having natural cellulose. The yarn comprises natural cellulose, wherein the natural cellulose comprises long cellulose and short cellulose, the content of the long cellulose accounts for at least 20% by weight of the total content of the yarn having natural cellulose, and the content of the short cellulose accounts for 0-80% by weight of the total content of the yarn having natural cellulose. An XRD diffraction pattern of the yarn having natural cellulose has diffraction peaks at 2θ of 20°±3°, 30°±3°, and 42.5°±3°. By defining the diffraction peaks in the XRD diffraction pattern of the yarn having natural cellulose to specify the type and source of the natural cellulose, the yarn having natural cellulose achieves a high spinning yield while maintaining high-quality elongation and strength, and the spinning stability of the yarn having natural cellulose is improved.

Description

Yarn containing natural cellulose Technical Field

[0001] This invention relates to the technology of cellulose fibers; in particular, it relates to a yarn containing natural cellulose. Background Technology

[0002] Currently, in the textile industry, natural fibers are mainly staple fibers and filaments. Staple fibers have high flexibility and excellent water absorption. However, due to their insufficient tensile strength, textile manufacturers often blend staple fibers with other cellulose materials. Staple fibers can be evenly mixed with other cellulose materials to improve the softness and moisture absorption of the cellulose materials. The spinning process of filaments requires the fibers to be stretched and wound infinitely. Based on this, filaments are required to have a high elongation rate and are not easy to break, resulting in filaments with higher tensile strength and durability, making them suitable for making high-strength ropes.

[0003] However, there are still some deficiencies in the production of long fibers. For example, the current spinning of long fibers mainly uses long cellulose with long molecular chains. Excessive amounts of such long cellulose not only reduce the rate of dissolution in ionic liquids (NMMO), but some manufacturers also choose to use a variety of cellulose types from different sources to spin long fibers, such as cotton, flax and wood pulp. However, using a variety of long molecular chain cellulose types will increase the processing difficulty in the spinning process.

[0004] Furthermore, in the field of textile environmental protection, many related companies are committed to developing recycled cellulose yarn, which mainly involves obtaining plant fibers from recycled clothing and then remanufacturing these recycled fibers into yarn, textiles, etc., to achieve the environmental protection concept of fiber regeneration and recycling. However, in actual recycling and spinning, the recycled cellulose from existing recycled clothing sources contains a large number of impurities. In addition, the recycled clothing is mixed with cellulose from different plant species, resulting in unstable crystallinity of the recycled cellulose. This causes the impurities in the recycled cellulose to affect the spinning quality during the blending process with natural cellulose, making it difficult to use recycled cellulose in large quantities for spinning and manufacturing. This makes it impossible to efficiently recycle the recycled clothing. Moreover, the tensile strength of the recycled cellulose yarn does not meet the specifications of long filaments, so it cannot be used as a suitable replacement for existing long filaments. Summary of the Invention

[0005] In view of this, the object of the present invention is to provide a natural cellulose yarn, wherein the type and source of the natural cellulose are specified by defining the diffraction peaks of the XRD diffraction pattern, and the natural cellulose yarn is made by blending long cellulose and short cellulose with a specific content, which further optimizes the spinning yield of the natural cellulose yarn to maintain high-quality elongation and strength; in addition, the natural cellulose yarn may also contain recycled cellulose, wherein the combination of the recycled cellulose and the natural cellulose can significantly accelerate the efficiency of complete dissolution in ionic liquid (NMMO), further improving the spinning stability of the natural cellulose yarn.

[0006] To achieve the above objectives, the present invention provides a natural cellulose yarn comprising a natural cellulose, wherein the natural cellulose comprises a long cellulose and a short cellulose, wherein the content of the long cellulose accounts for at least 20 wt% of the total content of the natural cellulose yarn by weight, and the content of the short cellulose accounts for between 0 wt% and 80 wt% of the total content of the natural cellulose yarn by weight, and the natural cellulose yarn exhibits diffraction peaks of 20°±3°, 30°±3°, and 42.5°±3° in XRD diffraction.

[0007] In one embodiment, the natural cellulose yarn further comprises recycled cellulose, the content of which is between 10 wt% and 50 wt% of the total content of the natural cellulose yarn, and the content of the short cellulose, by weight, is between 0 wt% and 40 wt% of the total content of the natural cellulose yarn, wherein the natural cellulose yarn has diffraction peaks of 13°±3°, 20°±3°, 30°±3°, and 42.5°±3° in XRD diffraction at 2θ.

[0008] The advantages of this invention are that the natural cellulose yarn, by defining the diffraction peaks of the XRD diffraction pattern, can regulate the type and source of the natural cellulose, and the natural cellulose yarn is made by blending long cellulose and short cellulose with a specific content, which further optimizes the spinning yield of the natural cellulose yarn to maintain high-quality elongation and strength, and increases the spinning stability of the natural cellulose yarn.

[0009] Furthermore, when the natural cellulose yarn comprises a combination of natural cellulose and recycled cellulose, the purity of the recycled cellulose raw material is rigorously screened, meaning that the recycled cellulose raw material does not contain other contaminants. Process testing has shown that the mixture of recycled cellulose and natural cellulose is more completely soluble in the ionic liquid (NMMO) and can significantly accelerate the efficiency of complete dissolution in the ionic liquid (NMMO). Moreover, XRD diffraction pattern analysis of the recycled cellulose added to the natural cellulose yarn shows that it contains a diffraction peak of 13°±3° and does not contain other noisy diffraction peaks, indicating that the natural cellulose yarn... The yarn exhibits a characteristic diffraction peak of 13°±3° in XRD, which is characteristic of yarns containing recycled cellulose. Furthermore, the recycled cellulose content in the natural cellulose yarn can reach up to 50wt%, completely replacing the use of short cellulose and increasing the amount of recycled cellulose added. The physical properties and strength of the natural cellulose yarn with recycled cellulose added both meet the standard specifications as well as those of the natural cellulose yarn using only natural cellulose. In fact, the addition of recycled cellulose to the natural cellulose yarn further increases elongation and strength, enhancing the market competitiveness of the natural cellulose yarn and improving the recycling rate of recycled cellulose. Attached Figure Description

[0010] Figure 1 is an electronic image of a natural cellulose yarn containing recycled cellulose according to a preferred embodiment of the present invention.

[0011] Figure 2A is an XRD diffraction curve of experimental group 1 of natural cellulose yarn in a preferred embodiment of the present invention.

[0012] Figure 2B is a pie chart showing the cellulose content of experimental group 1 in a natural cellulose yarn according to a preferred embodiment of the present invention.

[0013] Figure 3A is an XRD diffraction curve of experimental group 2 in a preferred embodiment of the present invention with natural cellulose yarn.

[0014] Figure 3B is a pie chart showing the cellulose content of experimental group 2 in a natural cellulose yarn according to a preferred embodiment of the present invention.

[0015] Figure 4A is an XRD diffraction curve of experimental group 3 in a preferred embodiment of the present invention using recycled cellulose yarn.

[0016] Figure 4B is a pie chart showing the cellulose content of experimental group 3 in a natural cellulose yarn according to a preferred embodiment of the present invention.

[0017] Figure 5A is an XRD diffraction curve of experimental group 4 in a preferred embodiment of the present invention using recycled cellulose yarn.

[0018] Figure 5B is a pie chart showing the cellulose content of experimental group 4 in a natural cellulose yarn according to a preferred embodiment of the present invention.

[0019] Figure 6A is an XRD diffraction curve of experimental group 5 in a preferred embodiment of the present invention using recycled cellulose yarn.

[0020] Figure 6B is a pie chart showing the cellulose content of experimental group 5 in a natural cellulose yarn according to a preferred embodiment of the present invention.

[0021] Figure 7A is an XRD diffraction curve of experimental group 6 in a preferred embodiment of the present invention with recycled cellulose yarn.

[0022] Figure 7B is a pie chart showing the cellulose content of experimental group 6 in a natural cellulose yarn according to a preferred embodiment of the present invention. Detailed Implementation

[0023] A preferred embodiment of the present invention provides a yarn with natural cellulose, comprising natural cellulose and recycled cellulose.

[0024] The natural cellulose is derived from virgin wood pulp. The natural cellulose comprises a long cellulose and a short cellulose. The long cellulose content, by weight, accounts for at least 20 wt% of the total content of the natural cellulose yarn, i.e., the long cellulose content is between 20 wt% and 100 wt%. The short cellulose content, by weight, accounts for between 0 wt% and 80 wt% of the total content of the natural cellulose yarn. In this embodiment, the degree of polymerization (DP) of the long cellulose is between 400 and 5000, and the degree of polymerization (DP) of the short cellulose is between 300 and 4000. The degree of polymerization of the short cellulose is less than that of the long cellulose. In a preferred embodiment, the degree of polymerization (DP) of the long cellulose is between 800 and 2000, and the degree of polymerization (DP) of the short cellulose is between 400 and 1200.

[0025] The recycled cellulose is sourced from cotton, which is obtained from discarded clothing. Literature studies show that natural cotton contains 80-95 wt% α-cellulose. Compared to other natural plants such as bananas, bark, wood, and hemp, the α-cellulose content of these other natural plants is below 80 wt%. The α-cellulose content in the recycled cellulose affects the spinning effect of the yarn containing natural cellulose. For example, a higher α-cellulose content in the recycled cellulose results in better spinning performance; conversely, a lower α-cellulose content results in poorer spinning performance. Therefore, the recycled cellulose is sourced from cotton and does not include other natural plant species. The content of the recycled cellulose in the total content of the yarn containing natural cellulose is between 0 wt% and 80 wt%. In this embodiment, the degree of polymerization (DP) of the recycled cellulose is between 200 and 5000, which is lower than that of long cellulose. In a preferred embodiment, the degree of polymerization (DP) of the recycled cellulose is between 200 and 1600.

[0026] In this embodiment, to distinguish between yarns containing recycled cellulose and yarns that do not contain recycled cellulose, the yarn containing natural cellulose is described as composed of natural cellulose and recycled cellulose, using recycled cellulose yarn (Lyocell) as an example; while the yarn containing natural cellulose is spun from natural cellulose but does not contain recycled cellulose, and is therefore described as yarn containing natural cellulose.

[0027] In a preferred embodiment, when the recycled cellulose yarn is composed of natural cellulose and recycled cellulose, the content of the recycled cellulose is between 10 wt% and 80 wt%, the content of the long cellulose is between 20 wt% and 90 wt%, the content of the short cellulose is between 0 wt% and 70 wt%, and the α-cellulose content of the recycled cellulose yarn is between 3 wt% and 20 wt%. The crystallinity of the recycled cellulose yarn is at least 80%, indicating that adding the recycled cellulose to the recycled cellulose yarn increases crystallinity and improves the slip and stretchability of the recycled cellulose yarn during spinning. The recycled cellulose yarn exhibits diffraction peaks of 13°±3°, 20°±3°, 30°±3°, and 42.5°±3° at 2θ in XRD diffraction. The elongation of the recycled cellulose yarn is at least 3.5%, and the strength (gf / d) is at least 3.5. In a preferred embodiment, the elongation of the recycled cellulose yarn is between 3.5% and 10%. Figure 1 shows the recycled cellulose yarn as measured by a scanning electron microscope (SEM). Electron micrographs (SEM) confirmed that the recycled cellulose yarn is a long filament and that the diameter of the single filament of the recycled cellulose yarn is less than 30 μm. In a preferred embodiment, the diameter of the single filament of the recycled cellulose yarn is between 6 and 14 μm.

[0028] In another embodiment, when the natural cellulose yarn does not contain the recycled cellulose, the content of long cellulose in the natural cellulose yarn is between 20 wt% and 100 wt%, and the content of short cellulose is between 0 wt% and 80 wt%. In a preferred embodiment, the natural cellulose yarn is a long-fiber yarn, the α-cellulose content of the natural cellulose yarn is between 10 wt% and 45 wt%, and the crystallinity of the natural cellulose yarn is at least 80%. The natural cellulose yarn exhibits XRD diffraction with 2θ peaks of 20°±3°, 30°±3°, and 42.5°±3°, and the elongation of the natural cellulose yarn is also at least 3.5%, and the strength (gf / d) is at least 3. .5 indicates that the natural cellulose yarn, without the addition of the recycled cellulose, does not contain a 13°±3° diffraction peak in XRD diffraction. This means that when the natural cellulose yarn has a 13°±3° diffraction peak in XRD diffraction, it is a characteristic diffraction peak of the recycled cellulose yarn (Lyocell) with the addition of the recycled cellulose. Furthermore, the crystallinity of the natural cellulose yarn without the addition of the recycled cellulose is relatively lower than that of the recycled cellulose yarn (Lyocell) with the addition of the recycled cellulose. In other words, the addition of the recycled cellulose to the recycled cellulose yarn (Lyocell) can correspondingly improve the yarn elongation and strength.

[0029] Specifically, the spinning method for the natural cellulose yarn and the recycled cellulose yarn involves dissolving the natural cellulose, or the natural cellulose and the recycled cellulose separately in an ionic liquid, such as N-methylmorpholine-N-oxide (NMMO) solvent, to form an ionic liquid. The ionic liquid (NMMO) is then spun (dry-jet wet spinning) to wind the yarn into the natural cellulose yarn or the recycled cellulose yarn. The physical properties of the recycled cellulose yarn are affected by variations in the type and solid content of the raw materials of the recycled cellulose and the natural cellulose.

[0030] The process revealed that when natural cellulose and recycled cellulose are used in combination during the recycled cellulose yarn manufacturing process, this embodiment, through strict screening of the purity of the recycled cellulose raw materials (i.e., the recycled cellulose raw materials do not contain other contaminants), under the same time conditions, the mixture of recycled cellulose and natural cellulose is more completely soluble in the ionic liquid (NMMO) than the use of natural cellulose alone. In other words, the combination of recycled cellulose and natural cellulose can significantly accelerate the efficiency of complete dissolution in the ionic liquid (NMMO), further enhancing the spinning stability of the recycled cellulose yarn.

[0031] In addition, to fully understand the purpose, features and effects of the present invention, this embodiment provides an analysis of the composition, content and characteristics of the natural cellulose yarn and the recycled cellulose yarn, and performs physical property testing on the natural cellulose yarn and the recycled cellulose yarn.

[0032] I. To explore the changes in diffraction peaks corresponding to different specifications of the aforementioned natural cellulose yarns:

[0033] (a) Prepare natural cellulose yarns for experimental groups 1-2:

[0034] Experimental Group 1: The natural cellulose yarn contains 30 wt% long cellulose and 70 wt% short cellulose, and the yarn has a specification of 30 denier / 24 yarns.

[0035] Experimental Group 2: The natural cellulose yarn contains 30 wt% long cellulose and 70 wt% short cellulose, and the yarn has a specification of 120 denier / 80 yarns.

[0036] (II) Detection of yarn diffraction peaks in experimental groups 1-2:

[0037] In this experiment, the natural cellulose yarns of experimental groups 1 and 2 were subjected to XRD diffraction tests, and the α-cellulose content and crystallinity were detected. The XRD instrument used in this embodiment was a D8-Advance ECO.

[0038] Figures 2A and 3A show the XRD diffraction test results for experimental groups 1 and 2. Figure 2A shows that experimental group 1 has diffraction peaks at 2θ of 17°, 30° and 42° in XRD diffraction. Figure 3A shows that experimental group 2 has diffraction peaks at 2θ of 20°, 30° and 42° in XRD diffraction. The α-cellulose content and crystallinity of the natural cellulose yarns in experimental groups 1 and 2 are shown in Table 1 below.

[0039] Table 1. Statistical results of α-cellulose content, β-cellulose content and crystallinity in natural cellulose yarns from experimental groups 1-2:

[0040] The results in Figures 2A and 3A and Table 1 show that the natural cellulose yarns from experimental groups 1 and 2 exhibited diffraction peaks of 20°±3°, 30°±3°, and 42.5°±3° in XRD diffraction. Figure 2B and Table 1 show that the α-cellulose content of experimental group 1 was 43 wt% and the β-cellulose content was 57 wt%. Figure 3B and Table 1 show that the α-cellulose content of experimental group 2 was 11.6 wt% and the β-cellulose content was 88.4 wt%. This difference is attributed to the spinning conditions of experimental groups 1 and 2. The differences were used to prepare natural cellulose yarns with different denier counts, resulting in a discrepancy in the α-cellulose content of experimental groups 1 and 2. The crystallinity measured in experimental groups 1 and 2 was above 80%, but the crystallinity of experimental group 2 (84.7%) was significantly lower than that of experimental group 1 (95.2%). This indicates that the specifications of the natural cellulose yarns have a relative impact on the α-cellulose content and crystallinity, and a higher denier count of the natural cellulose yarns relatively reduces the α-cellulose content and crystallinity.

[0041] (III) Testing the physical properties of the yarn in experimental group 1:

[0042] This experiment tested the physical properties of the natural cellulose yarn in Experimental Group 1, including elongation, strength, oil content, and moisture content. The elongation was tested according to ASTM D2256; the strength was tested according to ASTM D2256; and the oil content and moisture content were tested according to ACELON ISO. The test results of the various physical properties of the yarn in Experimental Group 1 are shown in Table 2 below.

[0043] Table 2. Statistical table of test results for various physical properties of yarns in experimental groups 1 and 2:

[0044] The results in Table 2 above show that the physical properties of the yarns in experimental groups 1 and 2 are basically within the standard range. The yarn elongation (%) of experimental group 1 is 4.03% and the strength (gf / d) is 4.65, while the yarn elongation (%) of experimental group 2 is 4.96% and the strength (gf / d) is 4.38. This indicates that the natural cellulose yarns in experimental groups 1 and 2, by limiting the diffraction peaks of the XRD diffraction pattern, regulate the type and source of the natural cellulose. Furthermore, the natural cellulose yarns are blended with a specific amount of long cellulose and short cellulose, which further optimizes the spinning yield of the natural cellulose yarns to maintain high-quality elongation and strength, and increases the spinning stability of the natural cellulose yarns.

[0045] II. Exploring the changes in the diffraction peaks and physical properties of the recycled cellulose yarn:

[0046] (a) Prepare the recycled cellulose yarn for experimental groups 3 and 4:

[0047] Experimental Group 3: The recycled cellulose yarn comprises natural cellulose and recycled cellulose. The long cellulose content of the natural cellulose accounts for 40 wt% of the total content of the recycled cellulose yarn, the short cellulose content of the natural cellulose accounts for 50 wt% of the total content of the recycled cellulose yarn, and the recycled cellulose content accounts for 10 wt% of the total content of the recycled cellulose yarn. The specification of the recycled cellulose yarn is 120 denier / 80 yarns.

[0048] Experimental Group 4: The recycled cellulose yarn contains natural cellulose and recycled cellulose. The long cellulose content of the natural cellulose accounts for 40 wt% of the total content of the recycled cellulose yarn, the short cellulose content of the natural cellulose accounts for 0 wt% of the total content of the recycled cellulose yarn, and the content of recycled cellulose accounts for 60 wt% of the total content of the recycled cellulose yarn. The specification of the recycled cellulose yarn is 80 denier / 40 yarns.

[0049] (II) Detection of the diffraction peaks of the recycled cellulose yarns in experimental groups 3 and 4:

[0050] In this experiment, the recycled cellulose yarns of experimental groups 3 and 4 were subjected to XRD diffraction tests, and the α-cellulose content and crystallinity were detected. Figures 4A and 5A show the XRD diffraction test results of experimental groups 3 and 4. From the results of Figures 4A and 5A, it can be seen that diffraction peaks exist at 13°, 20°, 30° and 42° in the XRD diffraction of experimental groups 3 and 4. The detection results of α-cellulose content and crystallinity in the recycled cellulose yarns of experimental groups 3 and 4 are shown in Table 3 below.

[0051] Table 3. Statistical results of α-cellulose content, β-cellulose content and crystallinity in the recycled cellulose yarns of experimental groups 3 and 4:

[0052] As shown in Figures 4A and 5A and Table 3, the XRD diffraction patterns of the recycled cellulose yarns in experimental groups 3 and 4 both exhibit a 13° diffraction peak. Figure 4B and Table 3 show that the α-cellulose content of experimental group 3 is 3.2 wt% and the β-cellulose content is 96.8 wt%. Figure 5B and Table 3 show that the α-cellulose content of experimental group 4 is 6.3 wt% and the β-cellulose content is 93.7 wt%. The crystallinity of experimental group 4 (90.8%) is significantly lower than that of experimental group 3 (93.8%), indicating that the amount of recycled cellulose added to the recycled cellulose yarn will relatively affect the α-cellulose content and crystallinity.

[0053] (III) Testing the physical properties of the recycled cellulose yarns in experimental groups 3 and 4:

[0054] This experiment tested the physical properties of the recycled cellulose yarns in experimental groups 3 and 4, including elongation, strength, oil content, and moisture content. The test results of the various physical properties of the yarns in experimental groups 3 and 4 are shown in Table 4 below.

[0055] Table 4. Statistical table of test results for various physical properties of the recycled cellulose yarns in experimental groups 3 and 4:

[0056] The results in Table 4 show that the physical properties of the recycled cellulose yarns in experimental groups 3 and 4 are basically within the standard range. The yarn elongation (%) of experimental group 3 is 4.96% and the strength (gf / d) is 4.38, while the yarn elongation (%) of experimental group 4 is 5.03% and the strength (gf / d) is 4.52. This indicates that the recycled cellulose yarns in experimental groups 3 and 4 have higher elongation and strength than the natural cellulose yarn in experimental group 1. This shows that adding recycled cellulose to the recycled cellulose yarn can indeed increase the spinning strength. The elongation and strength of the recycled cellulose yarn measured in experimental group 4 are significantly higher than those measured in experimental group 3, indicating that increasing the amount of recycled cellulose added to the recycled cellulose yarn can effectively help the structural stability of the spinning process.

[0057] III. Exploring the changes in diffraction peaks when the specifications of the recycled cellulose yarn are altered:

[0058] (a) Prepare the recycled cellulose yarn for experimental groups 5 and 6:

[0059] Experimental Group 5: The recycled cellulose yarn comprises natural cellulose and recycled cellulose. The long cellulose content of the natural cellulose accounts for 40 wt% of the total content of the recycled cellulose yarn, the short cellulose content of the natural cellulose accounts for 50 wt% of the total content of the recycled cellulose yarn, and the recycled cellulose content accounts for 10 wt% of the total content of the recycled cellulose yarn. The specification of the recycled cellulose yarn is 120 denier / 80 yarns.

[0060] Experimental Group 6: The recycled cellulose yarn comprises natural cellulose and recycled cellulose. The long cellulose content of the natural cellulose accounts for 40 wt% of the total content of the recycled cellulose yarn, the short cellulose content of the natural cellulose accounts for 0 wt% of the total content of the recycled cellulose yarn, and the recycled cellulose content accounts for 60 wt% of the total content of the recycled cellulose yarn. The specification of the recycled cellulose yarn is 120 denier / 80 yarns.

[0061] (II) Detection of yarn diffraction peaks in experimental groups 5 and 6:

[0062] In this experiment, the recycled cellulose yarns of experimental groups 5 and 6 were subjected to XRD diffraction tests, and the α-cellulose content and crystallinity were detected. Figures 6A and 7A show the XRD diffraction test results for experimental groups 5 and 6. From the results in Figures 6A and 7A, it can be seen that the recycled cellulose yarns of experimental groups 5 and 6 have diffraction peaks at 2θ of 13°, 20°, 30° and 42° in XRD diffraction. The detection results of α-cellulose content and crystallinity in the recycled cellulose yarns of experimental groups 5 and 6 are shown in Table 5 below.

[0063] Table 5. Statistical results of α-cellulose content, β-cellulose content and crystallinity in the recycled cellulose yarns of experimental groups 5 and 6:

[0064] As shown in Figures 6A and 7A and Table 5, experimental groups 5 and 6 differed from experimental groups 3 and 4 in that they had different denier specifications. Furthermore, the XRD diffraction patterns of the recycled cellulose yarns from experimental groups 5 and 6 also exhibited a 13° diffraction peak. Figure 6B and Table 5 show that experimental group 5 had an α-cellulose content of 17.4 wt% and a β-cellulose content of 82.6 wt%. Figure 7B and Table 5 show that experimental group 6 had an α-cellulose content of 11.6 wt% and a β-cellulose content of 88.4 wt%. The crystallinity of experimental group 5 was 90.5%, which is higher than that of experimental groups 3 and 4. The crystallinity of experimental group 6 was 91.1%, which was significantly reduced. A comparison of experimental groups 5 and 6 with the aforementioned experimental groups 3 and 4 revealed that the α-cellulose content in the recycled cellulose yarn is easily affected by the spinning conditions of the yarn specifications. Furthermore, compared to the natural cellulose yarn in experimental group 2, under the same denier specification, the crystallinity of the recycled cellulose yarn in experimental groups 5 and 6 was higher than that of the natural cellulose yarn in experimental group 2, indicating that adding recycled cellulose to the recycled cellulose yarn effectively increases its crystallinity.

[0065] In summary, the natural cellulose yarns in experimental groups 1 and 2, by defining the diffraction peaks of the XRD diffraction pattern, regulate the type and source of the natural cellulose. Furthermore, the natural cellulose yarns are blended with a specific amount of long and short cellulose to optimize the spinning yield of the natural cellulose yarns, maintain high-quality elongation and strength, and increase the spinning stability of the natural cellulose yarns.

[0066] Furthermore, through the aforementioned experiments in experimental groups 3-6, it was found that when the natural cellulose yarn is used in combination with the recycled cellulose, i.e., when the natural cellulose yarn is used as the recycled cellulose yarn, the recycled cellulose added to the recycled cellulose yarn, as detected by XRD diffraction pattern analysis, also contains a diffraction peak of 13°±3°, without any other noise diffraction peaks. This means that the 13°±3° diffraction peak measured in XRD diffraction of the recycled cellulose yarn is a characteristic diffraction peak of the added recycled cellulose. Moreover, the recycled cellulose content in the recycled cellulose yarn of experimental group 4 is 60wt%. In a preferred embodiment, the recycled cellulose content in the recycled cellulose yarn can be as high as 80wt% to completely replace the short cellulose. The use of recycled cellulose increases the amount of recycled cellulose added. In this experiment, the purity of the raw materials for recycled cellulose was strictly screened, meaning that the raw materials for recycled cellulose do not contain other contaminants. The mixture of recycled cellulose and natural cellulose can be more completely dissolved in the ionic liquid (NMMO) and can significantly accelerate the efficiency of complete dissolution in the ionic liquid (NMMO). Moreover, the physical properties and strength of the recycled cellulose yarn with recycled cellulose added meet the standard specifications, as do the physical properties and strength of the natural cellulose yarn using natural cellulose without recycled cellulose. In fact, the addition of recycled cellulose to the recycled cellulose yarn further increases the elongation and strength, enhances the market competitiveness of the recycled cellulose yarn, and improves the recycling rate of recycled cellulose.

[0067] The above description is only a preferred and feasible embodiment of the present invention. Any equivalent changes made by applying the present invention specification and claims should be included within the patent scope of the present invention.

Claims

1. A yarn containing natural cellulose, comprising: A natural cellulose comprising a long cellulose and a short cellulose, wherein the long cellulose accounts for at least 20 wt% of the total content of the natural cellulose yarn by weight, and the short cellulose accounts for between 0 wt% and 80 wt% of the total content of the natural cellulose yarn by weight, wherein the natural cellulose yarn has diffraction peaks of 20°±3°, 30°±3° and 42.5°±3° in XRD diffraction.

2. The natural cellulose yarn as claimed in claim 1, wherein the α-cellulose content of the natural cellulose yarn is between 10 wt% and 45 wt%, and the crystallinity of the natural cellulose yarn is at least 80%.

3. The natural cellulose yarn of claim 1 further comprises recycled cellulose, wherein the content of the recycled cellulose is between 10 wt% and 80 wt% of the total content of the natural cellulose yarn, and the content of the short cellulose is between 0 wt% and 70 wt% of the total content of the natural cellulose yarn, wherein the natural cellulose yarn, as a recycled cellulose yarn, comprises diffraction peaks of 13°±0.5°, 20°±0.5°, 30°±0.5°, and 42.5°±0.5° in XRD diffraction at 2θ.

4. The natural cellulose yarn as claimed in claim 3, wherein the α-cellulose content of the natural cellulose yarn is between 3 wt% and 20 wt%, and the crystallinity of the natural cellulose yarn is at least 80%.

5. The natural cellulose yarn as claimed in claim 3, wherein the degree of polymerization (DP) of the long cellulose is between 400 and 5000, the degree of polymerization (DP) of the short cellulose is between 300 and 4000, the degree of polymerization (DP) of the recycled cellulose is between 400 and 5000, the degree of polymerization of the long cellulose is greater than that of the short cellulose, and the degree of polymerization of the recycled cellulose is less than that of the long cellulose.

6. The natural cellulose yarn as claimed in claim 1 or 3, wherein the natural cellulose yarn is a long filament, the elongation of the natural cellulose yarn is at least 3.5%, and the strength (gf / d) is at least 3.

5.

7. The natural cellulose yarn as claimed in claim 3, wherein the monofilament diameter of the natural cellulose yarn is less than 30 μm.

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