Antibacterial fabric with moisture absorption and sweat releasing effects and preparation method thereof

Abstract

The invention relates to the technical field of textiles, and discloses an antibacterial fabric with moisture absorption and sweat releasing effects and a preparation method of the antibacterial fabric with the moisture absorption and sweat releasing effects. 13 to 17 parts of fibrilia; 21 to 24 parts of bamboo fiber; 5-9 parts of tencel; raw materials of the cotton fibers, the hemp fibers, the bamboo fibers, the tencel fibers and the regenerated polyester are pretreated, the treated raw materials are prepared according to the formula in parts by weight, the hemp fibers and the cotton fibers are evenly mixed at the normal temperature, the tencel fibers and the bamboo fibers are evenly mixed, two sets of mixed fibers are obtained, and even distribution is ensured; the regenerated polyester and the mixed fiber obtained in the third step are evenly mixed at the temperature of 45-55 DEG C and then spun into yarn through a spinning frame, a pressure loom is used for weaving the yarn into fabric at the temperature of 65-75 DEG C and under the pressure of 0.5-1 Mpa, finally, the fabric is dyed and shaped, and the antibacterial fabric is formed. Detecting the fabric according with the moisture absorption, sweat releasing and antibacterial standards, and finally obtaining the antibacterial fabric with the moisture absorption and sweat releasing effects.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, in particular to an antibacterial fabric with moisture absorption and perspiration elimination effects and a preparation method thereof. Background Art

[0002] In the prior art, the problems of high raw material cost, environmental pollution, poor moisture absorption and perspiration and antibacterial efficacy of antibacterial fabrics have always existed. Traditional antibacterial fabrics usually use chemical fibers or synthetic fibers as the main raw materials. These materials are not only expensive, but also generate a large amount of waste and pollutants during the production process, which has a serious impact on the environment. In addition, these fabrics have poor moisture absorption and perspiration properties, which can easily cause the wearer to feel stuffy and uncomfortable, especially in high temperature environments. At the same time, due to the lack of effective antibacterial treatment, these fabrics are prone to breed bacteria, affecting the health of the wearer. Therefore, the development of an environmentally friendly fabric with good moisture absorption and perspiration properties and excellent antibacterial effect has become a problem that needs to be solved urgently. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the shortcomings of the prior art, the present invention provides an antibacterial fabric with moisture absorption and perspiration-releasing effect and a preparation method thereof, which has the advantages of low raw material cost, environmental protection, moisture absorption and perspiration-releasing and antibacterial effect, and solves the problems of high raw material cost, environmental pollution, poor moisture absorption and perspiration-releasing and antibacterial effect in the prior art.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: an antibacterial fabric with moisture absorption and perspiration removal effect, the raw materials of the fabric and their weight parts are: 12-15 parts of cotton fiber; 13-17 parts of hemp fiber; 21-24 parts of bamboo fiber; 5-9 parts of Tencel; 2-5 parts of recycled polyester.

[0007] Preferably, the fabric raw materials and their weight parts are: 14 parts of cotton fiber; 13 parts of hemp fiber; 22 parts of bamboo fiber; 6 parts of Tencel; and 4 parts of recycled polyester.

[0008] Preferably, the fabric raw materials and their weight parts are: 12 parts of cotton fiber; 17 parts of hemp fiber; 23 parts of bamboo fiber; 6 parts of Tencel; and 3 parts of recycled polyester.

[0009] Preferably, the fabric raw materials and their weight parts are: 14 parts of cotton fiber; 15 parts of hemp fiber; 24 parts of bamboo fiber; 9 parts of Tencel; and 5 parts of recycled polyester.

[0010] Preferably, a method for preparing an antibacterial fabric with moisture absorption and perspiration function is prepared according to the above-mentioned antibacterial fabric raw material with moisture absorption and perspiration function and its weight parts, comprising the following preparation steps:

[0011] Step 1: Raw material pretreatment and antibacterial treatment: cotton fiber, hemp fiber, bamboo fiber, Tencel and recycled polyester are subjected to raw material pretreatment and antibacterial treatment;

[0012] Step 2: Raw material preparation: Prepare the processed raw materials according to the weight of the formula;

[0013] Step 3: Mixing raw material fibers: Evenly mix hemp fiber and cotton fiber at room temperature, and evenly mix tencel fiber and bamboo fiber to obtain two groups of mixed fibers;

[0014] Step 4, mixed spinning: the regenerated polyester and the mixed fiber in step 3 are uniformly mixed at a temperature of 45-55°C, and then spun into yarn through a spinning frame;

[0015] Step 5, weaving: use a pressure loom to weave the yarn into fabric at a temperature of 65-75℃ and a pressure of 0.5-1Mpa;

[0016] Step 6: Post-processing: Finally, the fabric is dyed and shaped to form an antibacterial fabric;

[0017] Step 7. Quality Inspection: Test the fabric to see if it meets moisture wicking and antibacterial standards.

[0018] Preferably, the cotton fiber is pretreated by immersing the cotton fiber in pure water and heating it at a temperature of 45-55°C for 1-1.5h, then adding an antibacterial agent that is 10% by weight of pure water, stirring continuously for 2-3h, and continuing to heat the temperature to 65°C for 5.5-6.5h to allow the cotton fiber to contain the antibacterial agent, then washing it with pure water two to three times, placing it in an oven at a temperature of 50-60°C, and drying the cotton fiber until the moisture content is 5%, then stopping the drying.

[0019] Preferably, the hemp fiber is pretreated as follows: the hemp fiber is degummed, then combed and cut into short hemp fibers, the short hemp fibers are bleached twice using hydrogen peroxide with a concentration of 5-8g / L, the first bleaching is at a temperature of 40-50°C for 25-30min, the second bleaching is at a temperature of 70-75°C for 28-35min, and then alkali boiled once using sodium hydroxide with a concentration of 20-25g / L, and high-temperature splitting is performed at 100-105°C for 1.2-1.5h. After the splitting is completed, the hemp fibers are washed 2-3 times with pure water and an antibacterial agent in a weight ratio of 1:1, and the cotton fibers are placed in an oven at a temperature of 80-90°C to dry the cotton fibers until the moisture content is 5%, and the pretreated hemp fibers are mixed with the cotton fibers at room temperature to obtain uniform mixed fibers.

[0020] Preferably, the bamboo fiber is pretreated as follows: the bamboo fiber raw material is placed in an oven, dried at a temperature of 100-105°C for 2-2.5 hours, and a stress wave timer is used to measure that the fiber reaches below the fiber saturation point, and then a viscose spinning method is used to place the fiber below the saturation point in a 5-8g / L sulfate solution for cooking at a temperature of 80-90°C and three times of 5-10g / L sodium hydroxide bleaching process to prepare bamboo pulp fiber pulp, the bamboo pulp fiber pulp is dissolved in a 15-20g / L sodium hydroxide solution to prepare a viscose solution, and finally wet spraying and wet spinning processes are used to spin the bamboo fiber.

[0021] Preferably, the Tencel pretreatment is as follows: the raw material of the Tencel fiber is artificial wood pulp fiber, the recycled artificial wood pulp fiber is cleaned, bleached with 10-15g / L hydrogen peroxide for 1.8-2h, washed with pure water 2-3 times after bleaching, dried in a natural environment, and processed into nano-scale wood pulp powder by a grinder, and then the nano-scale wood pulp powder is dissolved in 5-8g / L ammonium oxide solvent, and directly spun by a spinning machine to obtain Tencel fiber, and the Tencel fiber is evenly mixed with bamboo fiber.

[0022] Preferably, the recycled polyester is pretreated by recycling discarded food-grade plastic bottles, sorting, cleaning, crushing and drying the discarded food-grade plastic bottles, melting the dried polyester material at a temperature of 250-300°C to form a melt, and then filtering, purifying and homogenizing the melt to increase viscosity, and directly spinning it using a spinning machine after increasing viscosity to obtain recycled polyester.

[0023] Compared with the prior art, the present invention provides an antibacterial fabric with moisture absorption and perspiration wicking effect and a preparation method thereof, which has the following beneficial effects:

[0024] 1. Among the raw materials of the present invention, Tencel and recycled polyester are both derived from recycled waste materials, which can not only reduce the raw material cost of the fabric, but also improve the performance of the fabric. The finished product test results show that the environmental protection, hygroscopicity, perspiration and antibacterial properties of the fabric are improved, and appropriately increasing the proportion of Tencel is helpful to improve the environmental protection and hygroscopicity of the fabric, while appropriately increasing the recycled polyester is helpful to maintain the hygroscopicity and perspiration of the fabric. By reasonably adjusting the ratio of these two components and combining the preparation steps of the present invention, the overall performance of the antibacterial fabric can be further optimized, thereby solving the problems of high raw material cost, non-environmental protection, poor hygroscopicity and perspiration and antibacterial efficacy in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a flow chart of the steps of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1 , an antibacterial fabric with moisture absorption and perspiration removal effect. The raw materials of the fabric and their weight proportions are: 12-15 parts of cotton fiber; 13-17 parts of hemp fiber; 21-24 parts of bamboo fiber; 5-9 parts of Tencel (wood pulp); 2-5 parts of recycled polyester (recycled plastic bottles).

[0028] Specifically, a method for preparing an antibacterial fabric with moisture absorption and perspiration function is prepared according to the above-mentioned antibacterial fabric raw material with moisture absorption and perspiration function and its weight parts, comprising the following preparation steps:

[0029] Step 1: Raw material pretreatment and antibacterial treatment: cotton fiber, hemp fiber, bamboo fiber, Tencel and recycled polyester are subjected to raw material pretreatment and antibacterial treatment;

[0030] Step 2: Raw material preparation: Prepare the processed raw materials according to the weight of the formula;

[0031] Step 3: Mixing raw material fibers: Mix the hemp fiber and cotton fiber evenly at room temperature, and mix the tencel fiber and bamboo fiber evenly to obtain two groups of mixed fibers to ensure even distribution;

[0032] Step 4, mixed spinning: the regenerated polyester and the mixed fiber in step 3 are uniformly mixed at a temperature of 45-55°C, and then spun into yarn through a spinning frame;

[0033] Step 5, weaving: use a pressure loom to weave the yarn into fabric at a temperature of 65-75℃ and a pressure of 0.5-1Mpa;

[0034] Step 6: Post-treatment: Finally, the fabric is dyed and shaped to form an antibacterial fabric;

[0035] Step 7. Quality Inspection: Test the fabric to see if it meets moisture wicking and antibacterial standards.

[0036] Specifically, cotton fiber pretreatment: immerse the cotton fiber in pure water and heat it at a temperature of 45-55°C for 1-1.5h, then add 10% of the weight of the antibacterial agent in pure water, stir continuously for 2-3h, continue to heat the temperature to 65°C, maintain for 5.5-6.5h, so that the cotton fiber contains the antibacterial agent, then wash it with pure water two to three times, put it in an oven, use a temperature of 50-60°C, and dry the cotton fiber until the moisture content is 5%, then stop drying.

[0037] Specifically, the hemp fiber is pretreated as follows: the hemp fiber is degummed, then combed and cut into short hemp fibers, the short hemp fibers are bleached twice with 5-8g / L hydrogen peroxide, the first bleaching is at 40-50°C for 25-30min, the second bleaching is at 70-75°C for 28-35min, and then alkali boiled with 20-25g / L sodium hydroxide, and high-temperature splitting is performed at 100-105°C for 1.2-1.5h. After the splitting is completed, the weight ratio is used For example, the hemp fiber is washed 2-3 times with a 1:1 ratio of pure water and antibacterial agent (this step helps to remove residual chemicals and impurities, ensure the purity and antibacterial properties of the fiber, and prepare for subsequent mixing), put it in an oven, use a temperature of 80-90°C (this temperature range can effectively remove moisture and prevent fiber damage), and dry the cotton fiber to a moisture content of 5%. Then, mix the pretreated hemp fiber with the cotton fiber at room temperature to obtain a uniform mixed fiber (care should be taken to avoid fiber breakage during the mixing process and ensure that the two fibers are evenly distributed).

[0038] Specifically, bamboo fiber pretreatment: put the bamboo fiber raw material into an oven, dry it at a temperature of 100-105°C for 2-2.5 hours, use a stress wave timer to measure that the fiber reaches below the fiber saturation point, and then use a viscose spinning method to put the fiber below the saturation point into a 5-8g / L sulfate solution for cooking at a temperature of 80-90°C and three times of 5-10g / L sodium hydroxide bleaching process to prepare bamboo pulp fiber pulp, dissolve the bamboo pulp fiber pulp in a 15-20g / L sodium hydroxide solution to prepare a viscose solution, and finally use wet spraying and wet spinning processes to spin bamboo fibers.

[0039] Specifically, Tencel pretreatment: the raw material of Tencel fiber is artificial wood pulp fiber. The recycled artificial wood pulp fiber is cleaned, bleached with 10-15g / L hydrogen peroxide for 1.8-2h, washed with pure water 2-3 times after bleaching, dried in a natural environment, and processed into nano-scale wood pulp powder by a grinder. The nano-scale wood pulp powder is then dissolved in 5-8g / L ammonium oxide solvent, and directly spun by a spinning machine to obtain Tencel fiber, and the Tencel fiber is evenly mixed with bamboo fiber.

[0040] Specifically, the pretreatment of recycled polyester is: recycling discarded food-grade plastic bottles, sorting, cleaning, crushing and drying the discarded food-grade plastic bottles, and melting the dried polyester material at a temperature of 250-300°C to form a melt (this step is to convert the solid polyester material into a liquid form that can be used for spinning), and then filtering, purifying and homogenizing the melt to increase viscosity. After increasing viscosity, it is directly spun using a spinning machine to obtain recycled polyester.

[0041] Example 1

[0042] The raw materials of the fabric and their weight parts are: 14 parts of cotton fiber; 13 parts of hemp fiber; 22 parts of bamboo fiber; 6 parts of tencel; 4 parts of recycled polyester.

[0043] Example 2

[0044] The raw materials of the fabric and their weight parts are: 12 parts of cotton fiber; 17 parts of hemp fiber; 23 parts of bamboo fiber; 6 parts of tencel; and 3 parts of recycled polyester.

[0045] Example 3

[0046] The raw materials of the fabric and their weight parts are: 14 parts of cotton fiber; 15 parts of hemp fiber; 24 parts of bamboo fiber; 9 parts of tencel; and 5 parts of recycled polyester.

[0047] Comparative Example 1

[0048] The raw materials of the fabric and their weight parts are: 14 parts of cotton fiber; 13 parts of hemp fiber; 22 parts of bamboo fiber; 10 parts of recycled polyester (remove 6 parts of Tencel in Example 1 and add 6 parts of recycled polyester).

[0049] Comparative Example 2

[0050] The raw materials of the fabric and their weight parts are: 12 parts of cotton fiber; 17 parts of hemp fiber; 23 parts of bamboo fiber; 11 parts of tencel; 3 parts of recycled polyester (the tencel component in Example 2 is increased by 5 parts).

[0051] Comparative Example 3

[0052] The raw materials of the fabric and their weight parts are: 14 parts of cotton fiber; 15 parts of hemp fiber; 24 parts of bamboo fiber; 14 parts of tencel (5 parts of recycled polyester in Example 3 are removed and 5 parts of tencel are added).

[0053] The raw material formulas of the above embodiments and comparative examples were made into antibacterial fabrics, and the fabrics were tested for environmental protection, moisture absorption, perspiration and antibacterial properties. The test data are shown in Table 1 below:

[0054] Table 1

[0055]

[0056] Note:

[0057] Environmental performance (%): The environmental performance of fabrics is evaluated by testing the carbon emissions and chemical residues in the production process. The higher the value, the more environmentally friendly it is.

[0058] Hygroscopicity (%): The hygroscopicity of fabrics is evaluated by testing the speed and amount of moisture absorbed by the fabric. The higher the value, the better the hygroscopicity.

[0059] Sweat wicking (%): The sweat wicking performance of the fabric is evaluated by testing its efficiency in transferring sweat from the inside to the outside. The higher the value, the better the sweat wicking performance.

[0060] Antibacterial property (%): The antibacterial performance of the fabric is evaluated by testing its inhibitory effect on Staphylococcus aureus and Escherichia coli. The higher the value, the better the antibacterial property.

[0061] Comparing Examples 1-3: Example 3 performs best in all indicators, and is the best in environmental protection and antibacterial properties, indicating that the increase in the proportion of Tencel helps to improve the overall performance of the fabric;

[0062] Comparing Example 1 with Comparative Example 1: After removing Tencel and adding recycled polyester, the environmental protection and hygroscopicity of the fabric decreased, but the antibacterial property remained unchanged, indicating that Tencel plays an important role in improving the environmental protection and hygroscopicity of the fabric;

[0063] Comparing Example 2 with Comparative Example 2, after increasing the proportion of Tencel, the environmental protection and antibacterial properties of the fabric decreased, while the moisture absorption and perspiration properties also decreased, indicating that excessive Tencel ingredients will affect the overall performance balance of the fabric;

[0064] Compare Example 3 with Comparative Example 3: After removing the recycled polyester and adding Tencel, the environmental protection and antibacterial properties of the fabric are improved, but the moisture absorption and perspiration properties are slightly reduced, indicating that the recycled polyester helps maintain the moisture absorption and perspiration properties of the fabric.

[0065] In summary: Among the raw materials of the present invention, Tencel and recycled polyester are both derived from recycled waste materials, which can not only reduce the raw material cost of the fabric, but also improve the performance of the fabric. The finished product test results show that the environmental protection, hygroscopicity, perspiration and antibacterial properties of the fabric are all improved. By comparing the embodiment with the comparative example, when there is excessive or insufficient Tencel and recycled polyester in the raw materials, the performance of the fabric will be reduced. Therefore, the raw material formula of the present invention can achieve the best performance combination, and appropriately increasing the proportion of Tencel is helpful to improve the environmental protection and hygroscopicity of the fabric, while appropriately increasing the recycled polyester is helpful to maintain the hygroscopicity and perspiration of the fabric. By reasonably adjusting the ratio of these two components, the overall performance of the fabric can be further optimized.

[0066] 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. An antibacterial fabric with moisture absorption and perspiration wicking effect, characterized in that: The fabric raw materials and their weight parts are: 12-15 parts of cotton fiber; 13-17 parts of hemp fiber; 21-24 parts of bamboo fiber; 5-9 parts of tencel; and 2-5 parts of recycled polyester.

2. The antibacterial fabric with moisture absorption and perspiration wicking effect according to claim 1, characterized in that: The fabric raw materials and their weight parts are: 14 parts of cotton fiber; 13 parts of hemp fiber; 22 parts of bamboo fiber; 6 parts of tencel; and 4 parts of recycled polyester.

3. The antibacterial fabric with moisture absorption and perspiration wicking effect according to claim 1, characterized in that: The fabric raw materials and their weight parts are: 12 parts of cotton fiber; 17 parts of hemp fiber; 23 parts of bamboo fiber; 6 parts of tencel; and 3 parts of recycled polyester.

4. The antibacterial fabric with moisture absorption and perspiration wicking effect according to claim 1, characterized in that: The raw materials of the fabric and their weight parts are: 14 parts of cotton fiber; 15 parts of hemp fiber; 24 parts of bamboo fiber; 9 parts of tencel; and 5 parts of recycled polyester.

5. A method for preparing an antibacterial fabric with moisture absorption and perspiration wicking effect, characterized in that: The raw material of the antibacterial fabric with moisture absorption and perspiration wicking effect according to claim 1 and its weight parts are prepared, comprising the following preparation steps: Step 1: Raw material pretreatment and antibacterial treatment: cotton fiber, hemp fiber, bamboo fiber, Tencel and recycled polyester are subjected to raw material pretreatment and antibacterial treatment; Step 2: Raw material preparation: Prepare the processed raw materials according to the weight of the formula; Step 3: Mixing raw material fibers: Evenly mix hemp fiber and cotton fiber at room temperature, and evenly mix tencel fiber and bamboo fiber to obtain two groups of mixed fibers; Step 4, mixed spinning: the regenerated polyester and the mixed fiber in step 3 are uniformly mixed at a temperature of 45-55°C, and then spun into yarn through a spinning frame; Step 5, weaving: use a pressure loom to weave the yarn into fabric at a temperature of 65-75℃ and a pressure of 0.5-1Mpa; Step 6: Post-processing: Finally, the fabric is dyed and shaped to form an antibacterial fabric; Step 7. Quality Inspection: Test the fabric to see if it meets moisture wicking and antibacterial standards.

6. The method for preparing an antibacterial fabric with moisture absorption and perspiration wicking effect according to claim 5, characterized in that: The cotton fiber pretreatment comprises the following steps: immersing the cotton fiber in pure water, heating the cotton fiber at a temperature of 45-55° C. for 1-1.5 hours, adding an antibacterial agent which is 10% by weight of pure water, stirring the cotton fiber continuously for 2-3 hours, heating the cotton fiber to 65° C. for 5.5-6.5 hours, allowing the cotton fiber to contain the antibacterial agent, washing the cotton fiber with pure water for two to three times, placing the cotton fiber in an oven at a temperature of 50-60° C., drying the cotton fiber to a moisture content of 5%, and then stopping the oven.

7. The method for preparing an antibacterial fabric with moisture absorption and perspiration wicking effect according to claim 5, characterized in that: The hemp fiber pretreatment comprises: degumming the hemp fiber, combing and cutting the short hemp fiber, bleaching the short hemp fiber twice with hydrogen peroxide at a concentration of 5-8g / L, bleaching at a temperature of 40-50°C for 25-30min for the first time and bleaching at a temperature of 70-75°C for 28-35min for the second time, then alkali boiling with sodium hydroxide at a concentration of 20-25g / L, high-temperature splitting at 100-105°C for 1.2-1.5h, washing 2-3 times with pure water and an antibacterial agent at a weight ratio of 1:1 after the splitting is completed, putting the short hemp fiber in an oven, drying the cotton fiber at a temperature of 80-90°C until the moisture content is 5%, mixing the pretreated hemp fiber with the cotton fiber at room temperature to obtain uniform mixed fiber.

8. The method for preparing an antibacterial fabric with moisture absorption and perspiration wicking effect according to claim 5, characterized in that: The bamboo fiber pretreatment comprises: placing the bamboo fiber raw material in an oven, drying it at a temperature of 100-105° C. for 2-2.5 hours, using a stress wave timer to measure that the fiber reaches below the fiber saturation point, and then using a viscose spinning method to place the fiber below the saturation point in a 5-8 g / L sulfate solution for steaming at a temperature of 80-90° C. and three 5-10 g / L sodium hydroxide bleaching processes to prepare bamboo pulp fiber pulp, dissolving the bamboo pulp fiber pulp in a 15-20 g / L sodium hydroxide solution to prepare a viscose solution, and finally spinning the bamboo fiber by wet spraying and wet spinning processes.

9. The method for preparing an antibacterial fabric with moisture absorption and perspiration wicking effect according to claim 5, characterized in that: The Tencel pretreatment method comprises the following steps: the raw material of the Tencel fiber is artificial wood pulp fiber, the recycled artificial wood pulp fiber is cleaned, bleached with 10-15 g / L hydrogen peroxide for 1.8-2 hours, washed with pure water for 2-3 times after bleaching, dried in a natural environment, processed into nano-scale wood pulp powder by a grinder, dissolved in 5-8 g / L ammonium oxide solvent, spun directly by a spinning machine to obtain Tencel fiber, and the Tencel fiber is evenly mixed with bamboo fiber.

10. The method for preparing an antibacterial fabric with moisture absorption and perspiration wicking effect according to claim 5, characterized in that: The regenerated polyester pretreatment comprises: recycling discarded food-grade plastic bottles, sorting, cleaning, crushing and drying the discarded food-grade plastic bottles, melting the dried polyester material at a temperature of 250-300° C. to form a melt, filtering, purifying and homogenizing the melt to increase viscosity, and directly spinning the melt using a spinning machine after the increase in viscosity to obtain the regenerated polyester.

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