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CN-121994624-A - Quantitative characterization method for dimensional stability of synthetic fiber net piece

CN121994624ACN 121994624 ACN121994624 ACN 121994624ACN-121994624-A

Abstract

The invention provides a quantitative characterization method of the dimensional stability of a synthetic fiber net piece. Based on the characteristic that the size of the synthetic fiber net sheet is influenced by material characteristics, structural design, external force and external environment conditions, the net sheet is subjected to dynamic fatigue, and the size of the net sheet is obviously changed. The method for evaluating the dimensional stability of the synthetic fiber mesh is characterized in that a dynamic fatigue test is carried out on the synthetic fiber mesh in a stretching mode, and the ratio of the displacement difference between the fatigue cycle and the time when the first time of pre-tensioning is reached to the effective length of a clamp is used as a method for evaluating the dimensional stability of the synthetic fiber mesh. The method can quantitatively characterize the dimensional stability of the synthetic fiber mesh, and the smaller the ratio is, the better the dimensional stability of the synthetic fiber mesh is.

Inventors

  • ZHANG WENYANG
  • JIN DONG
  • SHI JIANGAO

Assignees

  • 中国水产科学研究院东海水产研究所

Dates

Publication Date
20260508
Application Date
20260210

Claims (7)

  1. 1. A quantitative characterization method for the dimensional stability of a synthetic fiber net sheet is characterized in that the synthetic fiber net sheet to be tested is cut into a sample with a certain size, a dynamic fatigue test is carried out in a stretching mode, and the ratio of the displacement difference between the fatigue cycle and the time when the first time reaches the pre-tension and the effective length of a clamp is used as a standard for evaluating the dimensional stability of the synthetic fiber net sheet.
  2. 2. The method for quantitatively characterizing dimensional stability of a synthetic fiber web according to claim 1, characterized in that: The preparation method of the sample comprises the following steps of cutting the synthetic fiber net sheet into a sample with the width of 4.5 meshes and ensuring the effective length between clamps to be 20 cm.
  3. 3. The method for quantitatively characterizing dimensional stability of a synthetic fiber web according to claim 1, characterized in that: Wherein the synthetic fiber mesh is selected from polyethylene mesh, polyamide multifilament mesh, polyamide monofilament mesh or ultra-high molecular weight polyethylene mesh.
  4. 4. The method for quantitatively characterizing dimensional stability of a synthetic fiber web according to claim 1, wherein the dynamic fatigue test is performed by using a fatigue tester.
  5. 5. The method for quantitatively characterizing dimensional stability of a synthetic fiber web according to claim 4, wherein: The test process is controlled by adopting a sine wave load, the maximum load of the test is 10% -80% of the breaking strength of the corresponding net, the ratio of the minimum load to the maximum load is 0.1, and the loading frequency is 1-10 Hz.
  6. 6. The method for quantitatively characterizing dimensional stability of a synthetic fiber web according to claim 1, characterized in that: the method for determining the pre-tension of the net sheet sample is as follows, and the pre-tension value of each mesh foot, warp thread or dimension thread is equal to the dead weight of the length of the net thread 250m according to the specification of GB/T6965-2004.
  7. 7. The method for quantitatively characterizing dimensional stability of a synthetic fiber web according to claim 1, wherein the number of dynamic fatigue tests is 1000-100000.

Description

Quantitative characterization method for dimensional stability of synthetic fiber net piece Technical Field The invention belongs to the technical field of fiber mesh representation, relates to representation of synthetic fiber meshes, and in particular relates to a quantitative representation method of the dimensional stability of the synthetic fiber meshes. Background The stability of the size of the synthetic fiber net sheet directly influences the usability and the fishing effect of fishery, and is mainly influenced by the material characteristics, structural design, external force and external environment conditions, namely, the elastic modulus and creep property of the synthetic fiber directly influence the stability of the size of the net sheet in terms of materials, for example, 0.5% -2% of plastic deformation of the high-density polyethylene net sheet under long-term load can be generated. In structural design, the knotted net sheet is easy to wear due to the protruding knots, the mesh size stability is poor, and the knotless net sheet (such as warp knitting and twisting) is more stable in size and high in wear resistance due to the absence of knots. In terms of external force, if the trawl is used, the mesh size is determined by the mesh length, if the knots slide or the wires are worn, the mesh length may be shortened, resulting in the reduction of the mesh size, thereby affecting the dimensional stability of the mesh. In addition, factors such as the diameter of the net wires, the shape of the net meshes and the assembly process also have influence on the dimensional stability of the net sheets, wherein the diameter of the net wires is ‌, the abrasion or stretching of the net wires can change the diameter to influence the stability of the net wires, so that the overall size of the net sheets is changed ‌, the deformation degree of the net meshes with different shapes such as the shape ‌, square, hexagon and the like is different after being stressed, the local or overall size of the net sheets is possibly changed ‌, ‌ is possibly caused when the net sheets are assembled, and the net sheets are deformed due to uneven load distribution if the tension is uneven during sewing or shrinking, so that the size ‌ of the net sheets is influenced. ‌ The mesh size of the synthetic fiber mesh sheet can be obviously changed under the action of external force and the like in the actual use process, so that a corresponding characterization method is needed to measure the change of the size of the synthetic fiber mesh sheet, but no mode for quantitatively characterizing the change of the size of the synthetic fiber mesh sheet to evaluate the stability of the synthetic fiber mesh sheet exists at present. Disclosure of Invention The invention aims at the problems and provides a quantitative characterization method for the dimensional stability of a synthetic fiber mesh. The core technical principle is that the size of the synthetic fiber net sheet is obviously changed after the net sheet is dynamically fatigued due to the influence of material characteristics, structural design, external force and external environment conditions. The method for evaluating the dimensional stability of the synthetic fiber mesh is characterized in that a dynamic fatigue test is carried out on the synthetic fiber mesh in a stretching mode, and the ratio of the displacement difference between the fatigue cycle and the time when the first time of pre-tensioning is reached to the effective length of a clamp is used as a method for evaluating the dimensional stability of the synthetic fiber mesh. The method can quantitatively characterize the dimensional stability of the synthetic fiber mesh, and the smaller the ratio is, the better the dimensional stability of the synthetic fiber mesh is. Based on the method, the invention provides a quantitative characterization method for the dimensional stability of the synthetic fiber net piece, which is characterized in that the synthetic fiber net piece to be detected is cut into a sample with a certain size, a dynamic fatigue test is carried out in a stretching mode, and the ratio of the displacement difference between the fatigue circulation for a certain times and the time when the fatigue circulation reaches the pre-tension for the first time and the effective length of a clamp is used as a standard for evaluating the dimensional stability of the synthetic fiber net piece, wherein the smaller the ratio is, the better the dimensional stability of the net piece is. Preferably, the sample is prepared by cutting synthetic fiber mesh into a sample with a width of 4.5 mesh and a length of about 30 cm (ensuring an effective length between clamps of 20 cm) with reference to national standard of GB/T4925-2008 test method for strength and elongation at break of synthetic fiber mesh. Preferably, the quantitative characterization method of the present invention is suitable for the dimensional stability cha