Low-temperature soaking pretreatment and low-temperature cocoon unwinding process
By using low-temperature immersion pretreatment and a staged treatment solution system, the problem of uneven immersion during silkworm cocoon unwinding was solved, achieving uniform immersion and efficient threading treatment of silkworm cocoons, and improving the unwinding quality and continuity of silk.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU FUAN COCOON SILK CO LTD
- Filing Date
- 2026-06-05
- Publication Date
- 2026-07-10
AI Technical Summary
In the existing silkworm cocoon unwinding process, the treatment solution mainly relies on natural diffusion to enter the cocoon layer, resulting in uneven wetting in different areas of the cocoon layer and insufficient wetting in some areas, which affects the adequacy of the silkworm cocoon entering the threading process.
The process employs a low-temperature immersion pretreatment, which includes low-temperature surface pre-wetting, intermittent air-venting immersion, and balanced immersion treatment. Combined with the use of a low-temperature binding solution, the process ensures uniform immersion of the silkworm cocoons and binding under low-temperature conditions through staged treatment with penetrating conditioning components and sericin stabilizing components.
This method ensures that the silkworm cocoons are evenly soaked before entering the reeling process, improving the continuity and efficiency of the cocoon unwinding process, reducing the number of thread breaks, and enhancing the continuous reeling process of the cocoons.
Smart Images
Figure CN122358337A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of silk processing technology, specifically to a low-temperature immersion pretreatment combined with low-temperature threading process for unwinding silkworm cocoons. Background Technology
[0002] In the silk production process, silkworm cocoons typically undergo unwinding treatment to obtain a continuous supply of reelable silk. Unwinding treatment is a crucial step in the silk reeling process, and its effectiveness affects the subsequent silk extraction and continuous reeling process. To achieve unwinding, the cocoons usually undergo soaking, softening, and binding treatments to bring the sericin components in the cocoon layer to a suitable state for unwinding, thus enabling the silk to be extracted.
[0003] In existing silkworm cocoon unwinding processes, common methods include hot water soaking, boiling, or direct threading after soaking. Specifically, the cocoons are soaked in a treatment solution, allowing the solution to contact the cocoon layer. Heating then softens the sericin in the cocoon layer, followed by threading and unwinding. During this process, the treatment solution gradually diffuses from the surface of the cocoon layer inwards. Some processes also employ stirring and circulating liquid flow to increase the soaking rate, before directly proceeding to the threading stage to complete the unwinding process.
[0004] However, the inventors of this application discovered in the process of implementing the technical solution of this application that the treatment liquid in the existing silkworm cocoon unwinding process mainly relies on natural diffusion to enter the cocoon layer, which can easily lead to differences in the saturation state of different areas of the cocoon layer. This results in some internal areas not being sufficiently saturated before entering the threading treatment stage, thus causing the silkworm cocoon to be insufficiently saturated before entering the threading treatment stage. Summary of the Invention
[0005] To address the shortcomings of existing technologies, this invention provides a low-temperature immersion pretreatment combined with low-temperature stringing process for unwinding silkworm cocoons, which solves the problem of insufficient immersion treatment of silkworm cocoons before stringing.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a low-temperature immersion pretreatment combined with low-temperature thread unwinding process for silkworm cocoons, comprising the following steps: S1. Prepare a low-temperature wetting solution, wherein the low-temperature wetting solution comprises, by mass percentage, 0.05%–0.35% of a weak organic acid adjusting component, 0.05%–0.15% of a nonionic wetting aid, 0.10%–1.20% of a natural polyhydroxy moisturizing component, 0.02%–0.20% of a penetration adjusting component, and the balance being water; the pH of the low-temperature wetting solution is 5.2–6.8. S2. The silkworm cocoons are immersed in the low-temperature wetting solution for surface low-temperature pre-wetting treatment. The treatment temperature is 25℃~38℃, the treatment time is 5min~25min, and the mass ratio of silkworm cocoons to low-temperature wetting solution is 1:(8~25). S3. The silkworm cocoons that have completed the surface low-temperature pre-wetting treatment are subjected to intermittent exhaust and immersion treatment. The intermittent exhaust and immersion treatment includes a negative pressure exhaust stage and a normal pressure re-wetting stage. The pressure of the negative pressure exhaust stage is -0.03MPa to -0.085MPa, and the holding time is 1min to 8min. The holding time of the normal pressure re-wetting stage is 3min to 15min, and the number of cycles is 2 to 8. S4. After completing the intermittent exhaust and immersion treatment, perform a balanced hydration treatment on the silkworm cocoons. The temperature for the balanced hydration treatment is 30℃~42℃, and the treatment time is 10min~60min. S5. Prepare a low-temperature sericin solution, wherein the low-temperature sericin solution comprises, by mass percentage, 0.03%–0.25% of a weak organic acid adjusting component, 0.01%–0.12% of a nonionic wetting agent, 0.08%–0.40% of a sericin stabilizing component, 0.05%–0.80% of a natural polyhydroxy moisturizing component, and the balance being water; the pH of the low-temperature sericin solution is 5.4–7.0. S6. The silkworm cocoons that have completed the balanced moisturizing treatment are transferred into the low-temperature binding solution for low-temperature binding treatment. The initial temperature of the low-temperature binding solution is 32℃~45℃, the heating rate is 0.3℃ / min~2.0℃ / min, the target temperature is 38℃~55℃, and the low-temperature binding treatment time is 5min~35min. S7. After completing the low-temperature cable treatment, perform the release traction treatment. The release traction treatment temperature is 40℃~58℃, the traction speed is 40m / min~180m / min, and the traction tension is 0.05cN / dtex~0.45cN / dtex.
[0007] Preferably, in step S1, the weak organic acid regulating component is one or more of citric acid, malic acid, and lactic acid, and the osmotic regulating component is one or more of sodium chloride, sodium sulfate, and sodium bicarbonate.
[0008] Preferably, in step S1, the nonionic wetting agent is one or more of alkyl glycosides, fatty alcohol polyoxyethylene ethers, and polyoxyethylene sorbitan fatty acid esters, and the natural polyhydroxy moisturizing component is one or more of glycerin, sorbitol, and trehalose.
[0009] Preferably, in step S2, the surface low-temperature pre-wetting treatment uses a circulating liquid flow treatment, wherein the circulating liquid flow rate is 0.05m / s to 0.35m / s, the stirring frequency is 1 time / min to 6 times / min, and the duration of each stirring is 5s to 30s.
[0010] Preferably, in step S3, the intermittent exhaust immersion treatment temperature is 28℃~42℃, and the negative pressure exhaust stage and the normal pressure re-immersion stage are alternated 3 to 6 times.
[0011] Preferably, in step S3, the low-temperature wetting liquid is kept flowing during the intermittent exhaust wetting process, and the flow rate of the low-temperature wetting liquid is 0.03m / s to 0.25m / s.
[0012] Preferably, in step S5, the sericin stabilizing component is one or more of sodium alginate, sodium carboxymethyl cellulose, chitosan lactate, and gelatin.
[0013] Preferably, in step S6, the mass ratio of silkworm cocoons to low-temperature binding liquid is 1:(10-30), and the low-temperature binding liquid is circulated during the heating process, with the circulation flow rate being 0.05m / s to 0.30m / s.
[0014] Preferably, in step S6, the cryogenic tracing process employs a liquid perturbation method for tracing, with a perturbation frequency of 2 times / min to 10 times / min and a duration of 3s to 20s for each perturbation.
[0015] Preferably, in steps S3 to S6, the intermittent exhaust impregnation treatment, the equalization wetting treatment, and the low-temperature sizing treatment are performed sequentially and continuously, and the content of nonionic impregnation aid in the low-temperature impregnation liquid is higher than the content of nonionic impregnation aid in the low-temperature sizing liquid; the low-temperature impregnation liquid includes a permeation conditioning component; the low-temperature sizing liquid includes a sericin stabilizing component.
[0016] This invention provides a low-temperature immersion pretreatment combined with low-temperature thread unwinding process for silkworm cocoons. It has the following beneficial effects: 1. This invention sets up a low-temperature wetting solution and sequentially performs low-temperature pre-wetting treatment on the surface, intermittent air-venting wetting treatment, and balanced wetting treatment, so that the low-temperature wetting solution can gradually enter the internal area of the cocoon along the thickness direction of the cocoon layer, thereby completing the wetting treatment of the cocoon before entering the low-temperature wetting treatment.
[0017] 2. This invention alternates between a negative pressure exhaust stage and a normal pressure re-wetting stage in the intermittent exhaust and wetting process, so that the gas in the pore area of the silkworm cocoon is discharged and then enters the corresponding area by the low temperature wetting liquid, thereby forming a process in which exhaust and wetting are carried out alternately.
[0018] 3. This invention sets up a low-temperature wetting solution and a low-temperature stringing solution separately, and makes the low-temperature wetting solution include a osmosis regulating component and the low-temperature stringing solution include a sericin stabilizing component, so that the wetting treatment stage and the low-temperature stringing stage use treatment solution systems with different compositions, thereby forming a staged silkworm cocoon unwinding treatment process.
[0019] 4. This invention transfers the silkworm cocoons into a low-temperature binding solution after completing the balanced moistening treatment, and performs unwinding and pulling treatment under set heating conditions. This allows the surface low-temperature pre-wetting treatment, intermittent air venting and wetting treatment, balanced moistening treatment, and low-temperature binding treatment to be sequentially connected, thereby forming a continuous silkworm cocoon unwinding process. Attached Figure Description
[0020] Figure 1 This is a flowchart of the low-temperature immersion pretreatment combined with low-temperature thread unwinding process of silkworm cocoons according to the present invention; Figure 2 This is a schematic diagram of the composition of the low-temperature wetting solution of the present invention; Figure 3 This is a schematic diagram of the intermittent exhaust impregnation process of the present invention; Figure 4 This is a schematic diagram of the low-temperature filament processing of the present invention; Figure 5 This is a bar chart comparing the continuous unwinding lengths of embodiments and comparative examples of the present invention; Figure 6 This is a bar chart comparing the number of thread breaks in the embodiments and comparative examples of the present invention. Detailed Implementation
[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0022] The following is in conjunction with the appendix Figure 1 The present application will be further described in detail with reference to the embodiments.
[0023] Preparation Example 1: Preparation of Low-Temperature Immersion Solution Add 4750g of deionized water to a 5L stainless steel stirring container. Start the stirrer and set the stirring speed to 200 rpm. Weigh 5g of citric acid and add it to the deionized water, stirring continuously for 10 minutes. Then add 20g of glycerol and 5g of sodium chloride, and continue stirring for 15 minutes. After the system is thoroughly mixed, add 20g of alkyl glycoside. Continue stirring for 15 minutes. Stop heating and allow to cool naturally to 25°C. The pH of the resulting solution is measured to be 5.8. Filter the resulting solution for later use to obtain low-temperature wetting solution A.
[0024] Preparation Example 2: Preparation of Low-Temperature Stranded Fluid Add 4760g of deionized water to a 5L stainless steel stirred container. Heat the system to 35℃. Start the stirrer and set the stirring speed to 250 rpm. Add 10g of sodium carboxymethyl cellulose. Stir at 35℃ for 30 minutes. After the sodium carboxymethyl cellulose is completely dispersed, add 5g of malic acid and 15g of sorbitol. Continue stirring for 10 minutes. Then add 10g of fatty alcohol polyoxyethylene ether. Continue stirring for 15 minutes. The pH of the resulting solution is measured to be 6.2. Filter and set aside to obtain low-temperature Soxhlet solution A.
[0025] Example 1: Please refer to the appendix Figure 2 S1. Preparation of low-temperature wetting solution: Add 4960g of deionized water, 2.5g of citric acid, 2.5g of alkyl glycoside, 5g of glycerol and 1g of sodium chloride to a 5L stirring container. Stir at 200r / min for 20min at 25℃ to obtain the low-temperature wetting solution. The pH of the low-temperature wetting solution is 5.4.
[0026] S2. 1000g of silkworm cocoons are immersed in a low-temperature wetting solution for surface pre-wetting treatment. The mass ratio of silkworm cocoons to low-temperature wetting solution is 1:8. The treatment temperature is 25℃ and the treatment time is 5min. The treatment is carried out by circulating liquid flow, with a circulation flow rate of 0.05m / s and an agitation frequency of 1 time / min. Each agitation lasts for 5s.
[0027] Please refer to the attached document. Figure 3 S3. Perform intermittent exhaust immersion treatment on the silkworm cocoons that have completed the surface low-temperature pre-wetting treatment. The temperature of the intermittent exhaust immersion treatment is 28℃. The pressure of the negative pressure exhaust stage is -0.03MPa and is maintained for 1min. The normal pressure re-wetting stage is maintained for 3min. The cycle is repeated twice. During the treatment, the low-temperature immersion liquid is kept flowing at a flow rate of 0.03m / s.
[0028] Please refer to the attached document. Figure 4 S4. After completing the intermittent exhaust and soaking treatment, the silkworm cocoons are subjected to a balanced moisture retention treatment at a temperature of 30℃ for 10 minutes.
[0029] S5. Preparation of low-temperature sorbic solution: Add 4966g of deionized water, 1.5g of malic acid, 0.5g of fatty alcohol polyoxyethylene ether, 4g of sodium carboxymethyl cellulose and 2.5g of sorbitol to a 5L stirred container. Stir at 250r / min for 30min at 35℃ to obtain the low-temperature sorbic solution. The pH of the low-temperature sorbic solution was found to be 5.5.
[0030] S6. Transfer the silkworm cocoons that have undergone balanced moistening treatment to a low-temperature binding solution for low-temperature binding treatment. The mass ratio of silkworm cocoons to low-temperature binding solution is 1:10. The initial temperature of the low-temperature binding solution is 32℃, the heating rate is 0.3℃ / min, the target temperature is 38℃, and the low-temperature binding treatment time is 5min. During the heating process, a circulating liquid flow is used for circulation at a flow rate of 0.05m / s. During the binding process, liquid disturbance is used for binding, with a disturbance frequency of 2 times / min and a duration of 3s for each disturbance.
[0031] S7. After completing the low-temperature yarn treatment, the unwinding and traction treatment is carried out. The unwinding and traction treatment temperature is 40℃, the traction speed is 40m / min, and the traction tension is 0.05cN / dtex to obtain unwinding silk.
[0032] Example 2: S1. Preparation of low-temperature wetting solution: Add 4928g of deionized water, 10g of malic acid, 5g of alkyl glycoside, 20g of glycerol and 5g of sodium chloride to a 5L stirring container. Stir at 250r / min for 20min at 30℃ to obtain the low-temperature wetting solution. The pH of the low-temperature wetting solution was found to be 5.9.
[0033] S2. 1000g of silkworm cocoons were immersed in a low-temperature wetting solution for surface pre-wetting treatment. The mass ratio of silkworm cocoons to low-temperature wetting solution was 1:15. The treatment temperature was 32℃ and the treatment time was 15min. The treatment was carried out by circulating liquid flow, with a circulation flow rate of 0.18m / s and an agitation frequency of 3 times / min. Each agitation lasted for 15s.
[0034] S3. Perform intermittent exhaust immersion treatment on the silkworm cocoons that have completed the surface low-temperature pre-wetting treatment. The temperature of the intermittent exhaust immersion treatment is 35℃. The pressure of the negative pressure exhaust stage is -0.06MPa and is maintained for 4min. The normal pressure re-wetting stage is maintained for 8min. The cycle is repeated 4 times. During the treatment, the low-temperature immersion liquid is kept flowing at a flow rate of 0.12m / s.
[0035] S4. After completing the intermittent air-purification and immersion treatment, perform a balanced humidification treatment on the silkworm cocoons. The balanced humidification treatment temperature is 36℃ and the treatment time is 30min.
[0036] S5. Preparation of low-temperature sorbic solution: Add 4942g of deionized water, 5g of malic acid, 3g of fatty alcohol polyoxyethylene ether, 10g of sodium carboxymethyl cellulose and 5g of sorbitol to a 5L stirred container. Stir at 250r / min for 30min at 38℃ to obtain the low-temperature sorbic solution. The pH of the low-temperature sorbic solution was measured to be 6.1.
[0037] S6. Transfer the silkworm cocoons that have undergone balanced moistening treatment to a low-temperature binding solution for low-temperature binding treatment. The mass ratio of silkworm cocoons to low-temperature binding solution is 1:20. The initial temperature of the low-temperature binding solution is 38℃, the heating rate is 1.0℃ / min, the target temperature is 46℃, and the low-temperature binding treatment time is 20min. During the heating process, a circulating liquid flow is used for circulation at a flow rate of 0.15m / s. During the binding process, liquid disturbance is used for binding, with a disturbance frequency of 5 times / min and a duration of 10s for each disturbance.
[0038] S7. After completing the low-temperature yarn treatment, the unwinding and traction treatment is carried out. The unwinding and traction treatment temperature is 48℃, the traction speed is 100m / min, and the traction tension is 0.20cN / dtex to obtain unwinding silk.
[0039] Example 3: S1. Preparation of low-temperature wetting solution: Add 4908g of deionized water, 17.5g of lactic acid, 7.5g of alkyl glycoside, 40g of trehalose, 20g of sorbitol, 5g of sodium bicarbonate, and 5g of sodium sulfate to a 5L stirred container. Stir at 300r / min for 25min at 35℃ to obtain the low-temperature wetting solution. The pH of the low-temperature wetting solution was found to be 6.6.
[0040] S2. 1000g of silkworm cocoons were immersed in a low-temperature wetting solution for surface pre-wetting treatment. The mass ratio of silkworm cocoons to low-temperature wetting solution was 1:25. The treatment temperature was 38℃ and the treatment time was 25min. The treatment was carried out by circulating liquid flow, with a circulation flow rate of 0.35m / s and an agitation frequency of 6 times / min. Each agitation lasted for 30s.
[0041] S3. Perform intermittent exhaust immersion treatment on the silkworm cocoons that have completed the surface low-temperature pre-wetting treatment. The temperature of the intermittent exhaust immersion treatment is 42℃. The pressure of the negative pressure exhaust stage is -0.085MPa and is maintained for 8min. The normal pressure re-wetting stage is maintained for 15min. The cycle is repeated 6 times. During the treatment, the low-temperature immersion liquid is kept flowing at a flow rate of 0.25m / s.
[0042] S4. After completing the intermittent exhaust and immersion treatment, perform a balanced hydration treatment on the silkworm cocoons. The balanced hydration treatment temperature is 42℃ and the treatment time is 60min.
[0043] S5. Preparation of low-temperature slew solution: Add 4920g of deionized water, 12.5g of lactic acid, 6g of fatty alcohol polyoxyethylene ether, 20g of sodium alginate and 40g of trehalose to a 5L stirred container. Stir at 300r / min for 40min at 45℃ to obtain the low-temperature slew solution. The pH of the low-temperature slew solution is 6.8.
[0044] S6. Transfer the silkworm cocoons that have undergone balanced moistening treatment to a low-temperature binding solution for low-temperature binding treatment. The mass ratio of silkworm cocoons to low-temperature binding solution is 1:30. The initial temperature of the low-temperature binding solution is 45℃, the heating rate is 2.0℃ / min, the target temperature is 55℃, and the low-temperature binding treatment time is 35min. During the heating process, a circulating liquid flow is used for circulation at a flow rate of 0.30m / s. During the binding process, liquid disturbance is used for binding, with a disturbance frequency of 10 times / min and a duration of 20s for each disturbance.
[0045] S7. After completing the low-temperature yarn treatment, the unwinding and traction treatment is carried out. The unwinding and traction treatment temperature is 58℃, the traction speed is 180m / min, and the traction tension is 0.45cN / dtex to obtain unwinding silk.
[0046] Comparative Example 1: Compared with Example 2, the difference is that the intermittent exhaust and wetting treatment is not performed in step S3, and the silkworm cocoons after completing step S2 are directly subjected to the balanced moisture retention treatment in step S4. The remaining steps and process parameters are consistent with those of Example 2.
[0047] Comparative Example 2: Compared with Example 2, the difference is that the equalization and moisturizing treatment in step S4 is cancelled, and the silkworm cocoons after completing the intermittent degassing and moisturizing treatment in step S3 directly enter the low-temperature stringing treatment in step S6. The remaining steps and process parameters are the same as in Example 2.
[0048] Comparative Example 3: Compared with Example 2, the difference is that the separate preparation of the low-temperature filament solution is omitted in step S5, and the low-temperature wetting solution obtained in step S1 is used for low-temperature filament treatment in step S6. That is, the same treatment solution system is used in the low-temperature wetting treatment stage and the low-temperature filament treatment stage. The remaining steps and process parameters are consistent with those of Example 2.
[0049] Comparative Example 4: Compared with Example 2, the difference is that the pressure of the negative pressure exhaust stage in step S3 is adjusted to -0.01MPa, and the holding time, number of cycles and other step parameters of the normal pressure re-wetting stage are consistent with those of Example 2.
[0050] Comparative Example 5: Compared with Example 2, the difference is that the low-temperature sewing solution prepared in step S5 does not contain sericin stabilizing components, while the composition, ratio and process parameters of the remaining components are consistent with those of Example 2.
[0051] Comparative Example 6: Compared with Example 2, the difference is that in step S2, the circulating liquid flow treatment is not used. Instead, the silkworm cocoons are placed in a low-temperature wetting solution for surface low-temperature pre-wetting treatment. The remaining steps and process parameters are the same as in Example 2.
[0052] Performance testing: Testing methods: The unwinding performance of silkworm cocoon samples obtained in Examples 1, 2, and 3, as well as Comparative Examples 1 to 6, was tested.
[0053] One hundred silkworm cocoons were used as test subjects in each sample group.
[0054] After the relaxation treatment is completed, continuous relaxation tests are conducted under the same relaxation equipment conditions.
[0055] Record the following parameters: (1) Average thread seeking time: the time required from the start of thread seeking to obtaining a stable thread.
[0056] (2) Continuous unwinding length: The length of continuous silk obtained by a single silkworm cocoon under the condition of no unwinding.
[0057] (3) Number of thread breaks: The total number of thread breaks that occur during the unwinding process of every 100 silkworm cocoons.
[0058] Each group of samples was tested three times, and the average value was taken as the final test result.
[0059]
[0060] Table 1 Results of the Relief Performance Test Stability testing methods for treatment fluids: The treatment solutions from Example 2, Comparative Example 3, and Comparative Example 5 were used for testing, respectively.
[0061] Record the parameters of the treatment solution after each batch of silkworm cocoons has been processed.
[0062] Ten batches of silkworm cocoons were processed consecutively.
[0063] The tests include: pH; conductivity; turbidity.
[0064] Record the parameter changes after processing the first and tenth batches.
[0065]
[0066] Table 2 Results of stability test of the treatment fluid In conjunction with Examples 1-3 and Comparative Example 1, and in conjunction with Table 1 and Figure 5 and Figure 6 It can be seen that after setting the intermittent venting and wetting treatment in the embodiments, the average search time decreases, the continuous unwinding length increases, and the number of thread breaks decreases; while in Comparative Example 1, after canceling the intermittent venting and wetting treatment, the average search time increases, the continuous unwinding length decreases, and the number of thread breaks increases, indicating that the intermittent venting and wetting treatment can affect the subsequent unwinding process.
[0067] Based on Example 2 and Comparative Example 2, and in conjunction with Table 1, it can be seen that when a balanced moistening treatment is added after the intermittent venting and wetting treatment, the continuous unwinding length is larger and the number of strand breaks is less; while in Comparative Example 2, after the balanced moistening treatment is removed, the continuous unwinding length decreases and the number of strand breaks increases, indicating that the balanced moistening treatment has an impact on the connection process between the wetting treatment and the low-temperature stranding treatment.
[0068] Based on Example 2 and Comparative Example 3, and in conjunction with Table 1, it can be seen that when low-temperature wetting solution and low-temperature thread-locking solution are used in the low-temperature wetting treatment stage and the low-temperature thread-locking treatment stage, respectively, the average thread-locking time is shorter and the continuous unwinding length is longer. However, in Comparative Example 3, which uses the same treatment solution to complete both the wetting treatment and the thread-locking treatment, the average thread-locking time increases and the continuous unwinding length decreases, indicating that the staged treatment solution system can affect the silkworm cocoon unwinding process.
[0069] Based on Examples 2, 4, and 6, and in conjunction with Table 1, it can be seen that the parameters of circulating liquid flow treatment and intermittent exhaust immersion treatment both affect the continuous unwinding length and the number of thread breaks during the unwinding process. This indicates that the liquid flow conditions and negative pressure exhaust conditions during the immersion treatment process have an impact on the silkworm cocoon unwinding process.
[0070] Based on Examples 2, 3, and 5, and in conjunction with Table 2, it can be seen that when the low-temperature wetting solution and the low-temperature sericin solution are respectively equipped with a permeation conditioning component and a sericin stabilizing component, the changes in the treatment solution parameters are small; however, when the sericin stabilizing component is removed or the same treatment solution system is used, the changes in the treatment solution parameters increase, indicating that using different composition treatment solution systems at different treatment stages can affect the changes in the state of the treatment solution during the treatment process.
[0071] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A silkworm cocoon unwinding process involving low-temperature immersion pretreatment and low-temperature threading, characterized in that, Includes the following steps: S1. Prepare a low-temperature wetting solution, wherein the low-temperature wetting solution comprises, by mass percentage, 0.05%–0.35% of a weak organic acid adjusting component, 0.05%–0.15% of a nonionic wetting aid, 0.10%–1.20% of a natural polyhydroxy moisturizing component, 0.02%–0.20% of a penetration adjusting component, and the remainder being water; the pH of the low-temperature wetting solution is 5.2–6.
8. S2. The silkworm cocoons are immersed in the low-temperature wetting solution for surface low-temperature pre-wetting treatment. The treatment temperature is 25℃~38℃, the treatment time is 5min~25min, and the mass ratio of silkworm cocoons to low-temperature wetting solution is 1:(8~25). S3. The silkworm cocoons that have completed the surface low-temperature pre-wetting treatment are subjected to intermittent exhaust and immersion treatment. The intermittent exhaust and immersion treatment includes a negative pressure exhaust stage and a normal pressure re-wetting stage. The pressure of the negative pressure exhaust stage is -0.03MPa to -0.085MPa, and the holding time is 1min to 8min. The holding time of the normal pressure re-wetting stage is 3min to 15min, and the number of cycles is 2 to 8. S4. After completing the intermittent exhaust and immersion treatment, perform a balanced hydration treatment on the silkworm cocoons. The temperature for the balanced hydration treatment is 30℃~42℃, and the treatment time is 10min~60min. S5. Prepare a low-temperature sericin solution, wherein the low-temperature sericin solution comprises, by mass percentage, 0.03%–0.25% of a weak organic acid adjusting component, 0.01%–0.12% of a nonionic wetting agent, 0.08%–0.40% of a sericin stabilizing component, 0.05%–0.80% of a natural polyhydroxy moisturizing component, and the balance being water; the pH of the low-temperature sericin solution is 5.4–7.
0. S6. The silkworm cocoons that have completed the balanced moisturizing treatment are transferred into the low-temperature binding solution for low-temperature binding treatment. The initial temperature of the low-temperature binding solution is 32℃~45℃, the heating rate is 0.3℃ / min~2.0℃ / min, the target temperature is 38℃~55℃, and the low-temperature binding treatment time is 5min~35min. S7. After completing the low-temperature cable treatment, perform the release traction treatment. The release traction treatment temperature is 40℃~58℃, the traction speed is 40m / min~180m / min, and the traction tension is 0.05cN / dtex~0.45cN / dtex.
2. The silkworm cocoon unwinding process based on low-temperature immersion pretreatment and low-temperature threading as described in claim 1, characterized in that, In step S1, the weak organic acid regulating component is one or more of citric acid, malic acid, and lactic acid, and the osmotic regulating component is one or more of sodium chloride, sodium sulfate, and sodium bicarbonate.
3. The silkworm cocoon unwinding process based on low-temperature immersion pretreatment and low-temperature threading as described in claim 1, characterized in that, In step S1, the nonionic wetting agent is one or more of alkyl glycosides, fatty alcohol polyoxyethylene ethers, and polyoxyethylene sorbitan fatty acid esters, and the natural polyhydroxy moisturizing component is one or more of glycerin, sorbitol, and trehalose.
4. The silkworm cocoon unwinding process based on low-temperature immersion pretreatment and low-temperature threading as described in claim 1, characterized in that, In step S2, the surface low-temperature pre-wetting treatment adopts a circulating liquid flow treatment. The circulating liquid flow rate is 0.05m / s to 0.35m / s, the stirring frequency is 1 time / min to 6 times / min, and the duration of each stirring is 5s to 30s.
5. The silkworm cocoon unwinding process of low-temperature immersion pretreatment combined with low-temperature threading according to claim 1, characterized in that, In step S3, the intermittent exhaust immersion treatment temperature is 28℃~42℃, and the negative pressure exhaust stage and the normal pressure re-immersion stage are alternated 3 to 6 times.
6. The silkworm cocoon unwinding process based on low-temperature immersion pretreatment and low-temperature threading as described in claim 5, characterized in that, In step S3, the low-temperature wetting liquid is kept flowing during the intermittent exhaust wetting process, and the flow rate of the low-temperature wetting liquid is 0.03m / s to 0.25m / s.
7. The silkworm cocoon unwinding process of low-temperature immersion pretreatment combined with low-temperature threading according to claim 1, characterized in that, In step S5, the sericin stabilizing component is one or more of sodium alginate, sodium carboxymethyl cellulose, chitosan lactate, and gelatin.
8. The silkworm cocoon unwinding process of low-temperature immersion pretreatment combined with low-temperature threading according to claim 1, characterized in that, In step S6, the mass ratio of silkworm cocoons to low-temperature binding liquid is 1:(10-30), and the low-temperature binding liquid is circulated during the heating process, with a flow rate of 0.05m / s to 0.30m / s.
9. The silkworm cocoon unwinding process of low-temperature immersion pretreatment synergistic with low-temperature threading according to claim 1, characterized in that, In step S6, the cryogenic tracing process employs a liquid perturbation method for tracing, with a perturbation frequency of 2 to 10 times per minute and a duration of 3 to 20 seconds for each perturbation.
10. The silkworm cocoon unwinding process of low-temperature immersion pretreatment synergistic with low-temperature threading according to claim 1, characterized in that, In steps S3 to S6, the intermittent exhaust impregnation treatment, the equalization and moisturizing treatment, and the low-temperature sizing treatment are performed sequentially and continuously, and the content of nonionic impregnation aid in the low-temperature impregnation liquid is higher than the content of nonionic impregnation aid in the low-temperature sizing liquid; the low-temperature impregnation liquid includes a permeation conditioning component; the low-temperature sizing liquid includes a sericin stabilizing component.