Twisting process of silk

Abstract

The invention relates to the technical field of silk twisting, and discloses a silk twisting process which comprises the following steps: S1, selecting materials; s2, performing pretreatment; s3, strength improvement treatment: the silk yarns are moved into a metal ion solution to be soaked for 30-45 minutes, so that the strength and hardness of the silk are improved; s4, glossiness improvement treatment: the silk yarns are moved into a solution containing a cationic softening agent, and the cationic softening agent carries positive charges and can attract negative charges on the surfaces of silk fibers, so that the cationic softening agent is adsorbed on the surfaces of the fibers; s5, twisting; and S6, carrying out post-treatment. By controlling the relation between the twisting degree and the silk yarn strength and the relation between the twisting degree and the glossiness, it is ensured that the strength and the glossiness of the silk fibers reach the ideal state after treatment, it is ensured that the strength of the silk fibers reaches the standard and the color degree is sufficient, and the silk fibers are prevented from being broken during processing; the dark color of the silk fibers is prevented, and subsequent processing of the silk fibers is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of silk twisting, in particular to a silk twisting process. Background Art

[0002] Twisting is a process of combining two or more monofilaments and then twisting the stretched thin strips by rotary motion like twisting a towel when washing your face, so as to fix the longitudinal connection between the fibers.

[0003] The dyeing and finishing of silk textiles includes four main processes: scouring, dyeing, printing and finishing of spun silk, raw silk and their fabrics. Most of them are produced in small batches intermittently. Silk textiles are relatively expensive. In daily life, the strength of silk yarn is relatively low. When it is used as a raw material for textiles, it will be twisted. However, the existing silk twisting process does not achieve the ideal strength and glossiness of silk fibers after treatment. The silk fiber strength does not meet the standard and the color is not enough, which leads to the breakage of silk fibers during processing and the dull color of silk fibers, which is not conducive to the subsequent processing of silk fibers. Summary of the invention

[0004] To achieve the above object, the present invention provides the following technical solution: a silk twisting process, comprising the following steps:

[0005] S1. Material selection: straighten and reel all silk yarns, remove the broken silk yarns, and then pack the reeled silk yarns;

[0006] S2, pretreatment: the packaged silk yarn is immersed in water at a temperature of 75-85°C for 50-60 minutes, and then immersed in a sodium hydroxide solution with a mass concentration of 20-25% for 30-45 minutes, so as to remove impurities and grease on the surface of the silk and make the surface rough;

[0007] S3, strength improvement treatment: the silk yarn is moved to a metal ion solution and soaked for 30-45 minutes, thereby improving the strength and hardness of the silk;

[0008] S4. Glossiness improvement treatment: the silk yarn is moved into a solution containing a cationic softener. The cationic softener has a positive charge and can attract the negative charge on the surface of the silk fiber, thereby being adsorbed on the fiber surface.

[0009] S5, twisting: dividing the pretreated silk yarn into two groups, one group is recorded as the first silk yarn, and the other group is recorded as the second silk yarn without twisting, the first silk yarn is forward twisted, and the forward twisted first silk yarn and the second silk yarn without twisting are twisted together;

[0010] S6. Post-processing: The silk fibers after twisting are cleaned and dried to remove residual chemicals and moisture, and the silk fibers are rolled up.

[0011] Preferably, S2 comprises the following steps:

[0012] S2-1, zinc ion solution treatment: immerse the silk yarn in zinc ion solution for 30-40 minutes. Zinc ions can interact with proteins in silk, increase the content of β-series sheets and crystals in silk fibers, and thus improve the strength and hardness of silk.

[0013] S2-2, drying: take out the silk yarn and let it stand until no liquid drips on the silk yarn, put the silk yarn into a drying device for treatment, control the drying temperature to 40-50°C, and control the drying time to 15-25 minutes.

[0014] Preferably, in S3, the concentration of the cationic softener is controlled at 0.5%-1.5%, the time is controlled at 20-40 minutes, and the mass ratio of the silk yarn to the cationic softener is controlled at 1:20, thereby improving the gloss of the silk yarn.

[0015] Preferably, in S5, the relationship between the degree of twisting and the strength of the silk yarn needs to be considered. For silk yarns with high strength, when the first strand of silk yarn is forward twisted, the forward twist can be controlled at 160-200 strands / 10cm; the forward twisted first strand of silk yarn and the untwisted second strand of silk yarn are twisted together, and the forward twist during the twisting is 140-180 strands / 10cm.

[0016] Preferably, in S5, for the silk yarn with low strength, when the first silk yarn is forward twisted, the forward twist can be controlled at 80-120 pieces / 10cm; the first silk yarn with forward twist and the second silk yarn without twist are twisted together, and the forward twist during the twisting is 60-100 pieces / 10cm.

[0017] Preferably, in S5, as the twisting degree increases, the strength of the silk fiber will show a trend of first increasing and then decreasing, which can be similarly expressed as the relationship between strength y and twist x, y=ax 2 +bx+c, where a, b, c are constants, and a<0.

[0018] Preferably, there is a critical value for the degree of twisting. When the degree of twisting is low, the cohesion between the fibers increases, so that when the silk is subjected to external force, the fibers can better bear the stress together, thereby increasing the strength. However, when the twisting is too high, the silk fibers will generate internal stress due to excessive twisting, resulting in damage to the fiber structure, which in turn reduces the strength.

[0019] Preferably, in S5, the change of twist degree and glossiness can be similarly expressed as the relationship between glossiness y and twist f, y=e(xf) 2 +g, where e, f, and g are constants. When the twisting degree is low, proper twisting can make the surface of the silk fiber more regular, and the reflection and refraction of light more uniform, thereby improving the glossiness. However, when the twist is too high, the distortion of the fiber will increase the scattering of light and reduce the glossiness.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] During work, by controlling the relationship between the degree of twisting and the strength of the silk yarn, and by controlling the relationship between the degree of twisting and the glossiness, after processing, it is ensured that the strength and glossiness of the silk fiber reach the ideal state, that the strength of the silk fiber meets the standard and the color is sufficient, to avoid silk fiber breakage during processing and prevent the silk fiber from becoming dull in color, which is beneficial to the subsequent processing of the silk fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] Example, taking 200 silk yarns as an example: Figure 1 The present invention discloses a silk twisting process, comprising the following steps:

[0026] S1. Material selection: straighten and reel all silk yarns, remove the broken silk yarns, and then pack the reeled silk yarns;

[0027] S2, pretreatment: the packaged silk yarn is immersed in water at a temperature of 80°C for 50 minutes, and then immersed in a sodium hydroxide solution with a mass concentration of 20% for 40 minutes, so as to remove impurities and grease on the surface of the silk and make the surface rough;

[0028] S2-1, zinc ion solution treatment: the silk yarn is immersed in zinc ion solution for 30 minutes. Zinc ions can interact with proteins in silk, increase the content of β series sheets and crystals in silk fibers, and thus improve the strength and hardness of silk.

[0029] S2-2, drying: taking out the silk yarn and letting it stand until no liquid drips on the silk yarn, putting the silk yarn into a drying device for treatment, controlling the drying temperature to 40° C. and the drying time to 15 minutes;

[0030] S3, strength improvement treatment: the silk yarn is moved to a metal ion solution and soaked for 30 minutes, thereby improving the strength and hardness of the silk;

[0031] Specifically, the concentration of the cationic softener is controlled at 1%, the time is controlled at 20 minutes, and the mass ratio of the silk yarn to the cationic softener is controlled at 1:20, thereby improving the gloss of the silk yarn;

[0032] S4. Glossiness improvement treatment: the silk yarn is moved into a solution containing a cationic softener. The cationic softener has a positive charge and can attract the negative charge on the surface of the silk fiber, thereby being adsorbed on the fiber surface.

[0033] S5, twisting: dividing the pretreated silk yarn into two groups, one group is recorded as the first silk yarn, and the other group is recorded as the second silk yarn without twisting, the first silk yarn is forward twisted, and the forward twisted first silk yarn and the second silk yarn without twisting are twisted together;

[0034] The relationship between the twisting degree and the strength of the silk yarn needs to be considered. For strong silk yarn, when the first strand of silk yarn is forward twisted, the forward twist can be controlled at 200 strands / 10cm; the first strand of silk yarn with forward twisting and the second strand of silk yarn without twisting are twisted together, and the forward twist during the twisting is 180 strands / 10cm;

[0035] For the silk yarn with low strength, when the first strand of silk yarn is forward twisted, the forward twist can be controlled at 80 strands / 10cm; the first strand of silk yarn with forward twist and the second strand of silk yarn without twist are twisted together, and the forward twist is 60 strands / 10cm during the twisting;

[0036] Specifically, as the degree of twisting increases, the strength of the silk fiber will show a trend of first increasing and then decreasing, which can be similarly expressed as the relationship between strength y and twist x, y = ax 2 +bx+c, where a, b, c are constants, and a<0;

[0037] The twisting degree has a critical value. When the twisting degree is low, the cohesion between the fibers increases, so that when the silk is subjected to external force, the fibers can better bear the stress together, thereby increasing the strength. However, when the twisting degree is too high, the silk fibers will generate internal stress due to excessive twisting, resulting in damage to the fiber structure, which in turn reduces the strength.

[0038] Specifically, the change in twist degree and glossiness can be similarly expressed as the relationship between glossiness y and twist f, y = e(xf) 2 +g, where e, f, and g are constants. When the twisting degree is low, proper twisting can make the surface of the silk fiber more regular, and the reflection and refraction of light more uniform, thereby improving the glossiness. However, when the twisting degree is too high, the distortion of the fiber will increase the scattering of light, and the glossiness will decrease.

[0039] S6. Post-processing: The silk fibers after twisting are cleaned and dried to remove residual chemicals and moisture, and the silk fibers are rolled up.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A silk twisting process, characterized in that: The following steps are involved: S1. Material selection: straighten and reel all silk yarns, remove the broken silk yarns, and then pack the reeled silk yarns; S2, pretreatment: the packaged silk yarn is immersed in water at a temperature of 75-85°C for 50-60 minutes, and then immersed in a sodium hydroxide solution with a mass concentration of 20-25% for 30-45 minutes, so as to remove impurities and grease on the surface of the silk and make the surface rough; S3, strength improvement treatment: the silk yarn is moved to a metal ion solution and soaked for 30-45 minutes, thereby improving the strength and hardness of the silk; S4. Glossiness improvement treatment: the silk yarn is moved into a solution containing a cationic softener. The cationic softener has a positive charge and can attract the negative charge on the surface of the silk fiber, thereby being adsorbed on the fiber surface. S5, twisting: dividing the pretreated silk yarn into two groups, one group is recorded as the first silk yarn, and the other group is recorded as the second silk yarn without twisting, the first silk yarn is forward twisted, and the forward twisted first silk yarn and the second silk yarn without twisting are twisted together; S6. Post-processing: The silk fibers after twisting are cleaned and dried to remove residual chemicals and moisture, and the silk fibers are rolled up.

2. A silk twisting process according to claim 1, characterized in that: The S2 comprises the following steps: S2-1, zinc ion solution treatment: immerse the silk yarn in zinc ion solution for 30-40 minutes. Zinc ions can interact with proteins in silk, increase the content of β-series sheets and crystals in silk fibers, and thus improve the strength and hardness of silk. S2-2, drying: take out the silk yarn and let it stand until no liquid drips on the silk yarn, put the silk yarn into a drying device for treatment, control the drying temperature to 40-50°C, and control the drying time to 15-25 minutes.

3. A silk twisting process according to claim 1, characterized in that: In S3, the concentration of the cationic softener is controlled at 0.5%-1.5%, the time is controlled at 20-40 minutes, and the mass ratio of the silk yarn to the cationic softener is controlled at 1:20, thereby improving the gloss of the silk yarn.

4. A silk twisting process according to claim 1, characterized in that: In S5, the relationship between the degree of twisting and the strength of the silk yarn needs to be considered. For silk yarns with high strength, when the first strand of silk yarn is forward twisted, the forward twist can be controlled at 160-200 strands / 10cm; the first strand of silk yarn with forward twisting and the second strand of silk yarn without twisting are twisted together, and the forward twist during the twisting is 140-180 strands / 10cm.

5. A silk twisting process according to claim 1, characterized in that: In S5, for the silk yarn with low strength, when the first silk yarn is forward twisted, the forward twist can be controlled at 80-120 pieces / 10cm; the first silk yarn with forward twist and the second silk yarn without twist are twisted together, and the forward twist during the twisting is 60-100 pieces / 10cm.

6. A silk twisting process according to claim 1, characterized in that: In S5, as the twisting degree increases, the strength of the silk fiber will show a trend of first increasing and then decreasing, which can be similarly expressed as the relationship between strength y and twist x, y=ax 2 +bx+c, where a, b, c are constants, and a<0.

7. A silk twisting process according to claim 6, characterized in that: There is a critical value for the degree of twisting. When the degree of twisting is low, the cohesion between the fibers increases, so that when the silk is subjected to external force, the fibers can better bear the stress together, thereby increasing the strength. However, when the degree of twisting is too high, the silk fibers will generate internal stress due to excessive twisting, causing damage to the fiber structure and reducing the strength.

8. The silk twisting process according to claim 1, characterized in that: In S5, the change of twist degree and glossiness can be similarly expressed as the relationship between glossiness y and twist f, y=e(xf) 2 +g, where e, f, and g are constants. When the twisting degree is low, proper twisting can make the surface of the silk fiber more regular, and the reflection and refraction of light more uniform, thereby improving the glossiness. However, when the twist is too high, the distortion of the fiber will increase the scattering of light and reduce the glossiness.

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