Method for testing hollowness of hollow fiber
By measuring and calculating the mixture of hollow fibers and circular cross-sectional fibers, a nonlinear model was established, and the problem of accuracy and low efficiency of hollow fiber tests was solved, and accurate measurement of hollow fibers and fiber-blended products were achieved. Quantitative analysis.
Patent Information
- Application Number
- CN202411306689.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-01-14
AI Technical Summary
The existing hollow fiber hollowness test methods have problems such as high difficulty in fiber cross-sectional slicing technology, low image distortion, low measurement accuracy and low efficiency, and it is difficult to accurately measure hollowness without destroying the fiber structure.
By selecting the hollow fiber to be tested and the typical circular cross-sectional fiber, cutting the short fiber segments, mixing and forming a fiber mixture of different mass ratios, measuring the projection width and number of roots using a microscope, establishing a nonlinear model, and calculating the hollowness using the least squares method. Define the fiber density ratio and obtain hollowness.
It effectively solves the problem of hollow fiber hollowness testing, improves the accuracy and efficiency of the test, and is suitable for quantitative analysis of hollow fibers and circular cross-sectional fibers.
Smart Images
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of fiber detection, and in particular to a method for testing the hollowness of a hollow fiber. Background Art
[0002] Kapok is a natural cellulose fiber, an excellent natural hollow fiber in nature. Kapok fiber is closed at both ends, and the middle cavity is filled with air. The hollowness is as high as 80% to 90%, and the cell wall thickness is only 1 to 2µm. It is generally used as oil absorption, warmth preservation, buoyancy or filling material. Existing testing technology makes it difficult to test the hollowness of kapok fiber without destroying the original structure of kapok fiber.
[0003] Hollow chemical fiber is the result of bionics application, and the cavity improves the warmth retention of the fiber. The varieties of hollow chemical fiber mainly include hollow polyester, hollow nylon, etc.; the number of hollow holes has developed from single hole to four holes, seven holes, twelve holes, etc.; the hollow cross-section has also developed from round to triangle, quadrilateral, plum blossom, etc. FZ / T 52004-2022 "Hollow Polyester Staple Fiber for Filling" stipulates that the hollow rate of single-component single-hole type is greater than 18%, and the hollow rate of single-component multi-hole type is greater than 12%. The hollow rate of hollow chemical fiber is not as high as that of kapok fiber, which is between 10%-50%.
[0004] The test method for the hollowness of hollow chemical fibers is FZ / T 50002-2013 "Test Method for the Degree of Shape of Chemical Fibers", which stipulates the determination method of the cross-sectional shape parameters of shaped fibers, including the determination of the hollowness index, which is characterized by the percentage of the hollow area of the fiber cross section to the fiber cross-sectional area. In practice, the hollowness of hollow fibers is measured, and there are problems such as high difficulty in fiber cross-sectional slicing technology, distortion of fiber cross-sectional images, low accuracy in measuring fiber cross-sectional area, and low test efficiency. Therefore, there are great technical barriers to the test of fiber hollowness. Summary of the invention
[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a method for testing the hollowness of hollow fibers to solve the problem of testing the hollowness of hollow fibers.
[0006] The object of the present invention is achieved in that: The present invention relates to a method for testing the hollowness of a hollow fiber, which specifically comprises the following steps: (1) Select the hollow fiber to be tested, including kapok fiber, hollow polyester, hollow nylon, etc., with a hollowness between 0-100%; (2) Select a typical circular cross-section fiber: polyester fiber (polyester), with a hollowness of 0%; (3) Use a Hasse slicer to cut short fiber segments of length L (0.2-0.4 mm) from different types of hollow fibers to be tested and typical circular cross-section fibers. Use a 1 / 10,000 balance to weigh a certain mass of the hollow fibers m. 中空 and circular cross-section fiber m 圆形 , mixed into a series of fiber mixtures with different mass ratios, the following formula is used to calculate the mass percentage P of the circular cross-section fiber 圆形-配比 : .
[0007] In formula (1): P 圆形-配比 is the mass percentage of circular cross-section fiber, %.
[0008] (4) Place the fiber mixture of different mass proportions into a watch glass, add appropriate amount of liquid paraffin and dispersant, stir thoroughly to form a uniformly mixed fiber suspension, take a certain amount of the suspension with a pipette, transfer it to a glass slide, and prepare a sample observation slide; (5) Place the sample observation slide on the microscope stage and measure the relevant fiber projection width d 中空 ,d 圆形 and root number n 中空 、n 圆形 , use the following formula to calculate the measured mass percentage P of circular cross-section fiber 圆形-实测 : .
[0009] In formula (2-4): m 中空-实测 is the measured mass of the hollow fiber, mg; m 圆形-实测 is the measured mass of the circular cross-section fiber, mg; P 圆形-实测 is the measured mass percentage of circular cross-section fiber, %.
[0010] (6) The fiber density ratio r is defined according to the following formula: 中空 / 圆形 : .
[0011] In formula (5): ρ 中空 is the density of the hollow fiber, g / cm 3 ; ρ 圆形 is the density of round fiber, g / cm 3 .
[0012] (7) The hollowness Z of the hollow fiber is defined according to the following formula: 中空 : .
[0013] In formula (6): Z 中空 is the hollowness of the hollow fiber, %.
[0014] (8) Establish the circular cross-section fiber ratio value P 圆形-配比 and the measured value P 圆形-实测 The nonlinear model between , using the least squares method, obtains the model parameter Z 中空 , that is, the hollowness of the hollow fiber: .
[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention measures the projection width and number of the hollow fibers and the circular cross-section fibers by mixing hollow fibers and circular cross-section fibers in different mass proportions, defines the hollowness of the hollow fibers, establishes a nonlinear model between the circular cross-section fiber ratio value and the measured value, and applies the least square method to obtain the hollowness of the hollow fibers, which is a characteristic parameter, and effectively solves the hollowness test problem of the hollow fibers. The present invention is not limited to evaluating the hollowness of hollow fibers, but is also applicable to the quantitative analysis of blended products of hollow fibers and circular cross-section fibers. DETAILED DESCRIPTION
[0016] Embodiment 1: A method for testing the hollowness of a hollow fiber comprises the following steps: (1) The hollow fiber to be tested is kapok fiber; (2) The circular cross-section fiber is 1.56dtex*38mm polyester fiber; (3) Using a Hastelloy slicer, kapok fiber and polyester fiber were cut into short fiber segments with a length of 0.2-0.4 mm, and a certain mass of hollow fiber and circular cross-section fiber were weighed using a 1 / 10,000 balance, respectively, and a series of fiber mixtures with different mass ratios (10%, 30%, 50%, 70%, 90%) were mixed to obtain the mass percentage of polyester fiber; (4) placing the fiber mixture of different mass proportions in step (3) into a watch glass, adding an appropriate amount of solvent, stirring thoroughly to form a uniformly mixed fiber suspension, taking a certain amount of the suspension with a pipette, transferring it to a glass slide, and preparing a sample observation slide; (5) Place the sample observation slide on the microscope stage, measure the projection width and number of relevant fibers, and obtain the actual mass percentage of polyester fibers; (6) Define the density ratio of kapok fiber and polyester fiber ; (7) Establish a nonlinear model between the polyester fiber ratio and the measured value (Formula 7), and apply the least squares method to obtain the model parameter Z 中空 , that is, the hollowness Z of kapok fiber 木棉 =81.2%, see Table 1.
[0017] Table 1 Kapok / Polyester .
[0018] Among them, the nonlinear model polyester is the polyester fitting value predicted by the nonlinear model. 中空 The model can then predict new fitted values for polyester.
[0019] Embodiment 2: A method for testing the hollowness of a hollow fiber comprises the following steps: (1) The hollow fiber to be tested is 9.99dtex*64mm hollow polyester fiber; (2) The circular cross-section fiber is 1.56dtex*38mm polyester fiber; (3) Using a Hastelloy slicer, the hollow polyester fiber and the polyester fiber were cut into short fiber segments with a length of 0.2-0.4 mm, and a certain mass of the hollow fiber and the circular cross-section fiber were weighed using a 1 / 10,000 balance, respectively, and a series of fiber mixtures with different mass ratios (10%, 30%, 50%, 70%, 90%) were mixed to obtain the mass percentage of the polyester fiber; (4) placing the fiber mixture of different mass proportions in step (3) into a watch glass, adding an appropriate amount of solvent, stirring thoroughly to form a uniformly mixed fiber suspension, taking a certain amount of the suspension with a pipette, transferring it to a glass slide, and preparing a sample observation slide; (5) Place the sample observation slide on the microscope stage, measure the projection width and number of relevant fibers, and obtain the actual mass percentage of polyester fibers; (6) Definition of hollow polyester fiber and polyester fiber density ratio ; (7) Establish a nonlinear model between the polyester fiber ratio and the measured value (Formula 7), and apply the least squares method to obtain the model parameter Z 中空 , that is, the hollowness Z of the hollow polyester fiber 中空涤纶 =27.6%, see Table 2.
[0020] Table 2 Hollow polyester / polyester .
[0021] Embodiment 3: A method for testing the hollowness of a hollow fiber comprises the following steps: (1) The hollow fiber to be tested is 18.89dtex*64mm hollow polyester fiber; (2) The circular cross-section fiber is 1.56dtex*38mm polyester fiber; (3) Using a Hastelloy slicer, the hollow polyester fiber and the polyester fiber were cut into short fiber segments with a length of 0.2-0.4 mm, and a certain mass of the hollow fiber and the circular cross-section fiber were weighed using a 1 / 10,000 balance, respectively, and a series of fiber mixtures with different mass ratios (10%, 30%, 50%, 70%, 90%) were mixed to obtain the mass percentage of the polyester fiber; (4) placing the fiber mixture of different mass proportions in step (3) into a watch glass, adding an appropriate amount of solvent, stirring thoroughly to form a uniformly mixed fiber suspension, taking a certain amount of the suspension with a pipette, transferring it to a glass slide, and preparing a sample observation slide; (5) Place the sample observation slide on the microscope stage, measure the projection width and number of relevant fibers, and obtain the actual mass percentage of polyester fibers; (6) Definition of hollow polyester fiber and polyester fiber density ratio ; (7) Establish a nonlinear model between the polyester fiber ratio and the measured value (Formula 7), and apply the least squares method to obtain the model parameter Z 中空 , that is, the hollowness Z of the hollow polyester fiber 中空涤纶 =47.6%, see Table 3.
[0022] Table 3 Hollow polyester / polyester .
[0023] It can be seen from the test results that the hollowness testing method of a hollow fiber established by the present invention is helpful to solve the hollowness testing problem of the hollow fiber.
[0024] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.
Claims
1. A method for testing the hollowness of a hollow fiber, characterized in that: The following steps are involved: (1) Select the hollow fiber to be tested; (2) Select a typical circular cross-section fiber; (3) Use a Hasse slicer to cut short fiber segments with a length of 0.2-0.4 mm from the different types of hollow fibers to be tested and typical circular cross-section fibers. Use a 1 / 10,000 balance to weigh a certain mass of the hollow fibers m 中空 and circular cross-section fiber m 圆形 , mixed into a series of fiber mixtures with different mass ratios, and the mass percentage P of the circular cross-section fiber is obtained. 圆形-配比 ; (4) placing the fiber mixture of different mass proportions in step (3) into a watch glass, adding an appropriate amount of solvent, stirring thoroughly to form a uniformly mixed fiber suspension, taking a certain amount of the suspension with a pipette, transferring it to a glass slide, and preparing a sample observation slide; (5) Place the sample observation slide on the microscope stage and measure the relevant fiber projection width d 中空 ,d 圆形 and root number n 中空 、n 圆形 , and obtain the measured mass percentage P of circular cross-section fiber 圆形-实测 ; (6) Define fiber density ratio r 中空 / 圆形 ; (7) Based on the fiber density ratio, define the hollowness Z of the hollow fiber: 中空 ; (8) Establish the circular cross-section fiber ratio value P 圆形-配比 and the measured value P 圆形-实测 The nonlinear model between , using the least squares method, obtains the model parameter Z 中空 , that is, the hollowness of the hollow fiber.
2. The hollowness testing method of a hollow fiber according to claim 1, characterized in that: In the step (1), the hollow fibers to be tested include kapok fibers, hollow polyester fibers, and hollow nylon fibers, and the hollowness thereof is between 0% and 100%.
3. The hollowness testing method of a hollow fiber according to claim 1, characterized in that: In the step (2), the typical circular cross-section fiber is polyester fiber, also known as terylene, with a hollowness of 0%.
4. The hollowness testing method of a hollow fiber according to claim 1, characterized in that: In the step (3), the mass proportions of the fiber mixture are 10%, 30%, 50%, 70% and 90% respectively.
5. The hollowness testing method of a hollow fiber according to claim 1, characterized in that: In the step (6), the fiber density ratio r 中空 / 圆形 Defined as: ； Among them, ρ 中空 is the density of the hollow fiber, g / cm 3 ρ 圆形 is the density of round fiber, g / cm 3 .
6. A hollow fiber hollowness testing method according to claim 5, characterized in that: In the step (7), the hollowness Z of the hollow fiber is 中空 Defined as: ； Among them, Z 中空 is the hollowness of the hollow fiber, %.
7. The method for testing the hollowness of a hollow fiber according to claim 1, characterized in that: In step (8), the nonlinear model is as follows: ； So as to obtain the model parameter Z 中空 .