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Method for manufacturing fiber cross section slices

A technology of fiber cross-section and production method, which is applied in the field of forensic science, can solve the problems of long sample preparation period, large number of samples, and difficult operation, etc., and achieve the effect of short production period, strong practicability, and simple operation

Inactive Publication Date: 2014-12-10
INST OF FORENSIC SCI OF MIN OF PUBLIC SECURITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional method, this technology has the characteristics of good fiber dispersion and small extrusion deformation, but the sample preparation cycle is long, and it is not easy for general laboratories and staff to operate, and this method still requires a large number of samples, which cannot meet the requirements of trace or even single samples in the field of forensic science. The need for root fiber cross-section inspection

Method used

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  • Method for manufacturing fiber cross section slices
  • Method for manufacturing fiber cross section slices
  • Method for manufacturing fiber cross section slices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1, making single or a bundle of pentagonal polyester fiber cross-section slices

[0037] Add the mixed Gelianghao brand 302 modified acrylic AB glue to the bottom of the container. After 30 seconds of quick-drying glue is slightly dried, place a single pentagonal polyester fiber along the length of the container with tweezers. The surface of the quick-drying adhesive; then continue to drop the quick-drying adhesive into the holding container to cover a single pentagonal polyester fiber until the quick-drying adhesive is full of the holding container; after about 15 minutes of quick-drying adhesive curing, remove the holding container and plasticine, A glue stick embedded with a single pentagonal polyester fiber is obtained; the glue stick is sliced ​​with a rotary microtome to obtain a single pentagonal polyester fiber cross-sectional slice.

[0038] The thickness of the prepared single pentagonal polyester fiber cross section slice is 15 μm.

[0039] Its sc...

Embodiment 2

[0043] Embodiment 2, making the cross-sectional slices of different microfibers

[0044] The specific production method is basically the same as that of Example 1, except that the fibers are replaced by a bunch of cotton, a single piece of hemp, a bunch of tencel, a bunch of rabbit down, a bunch of triangular nylon, a single four-hole polyester, A bundle of round nylon and a bundle of multi-section polyvinyl fibers;

[0045] And replace Gelianghao brand 302 modified acrylate AB glue with Baide brand quick-drying transparent strong epoxy resin AB glue;

[0046] The required drying time is 30 seconds;

[0047] The required curing time is 30 minutes.

[0048] The cross-sections of a bundle of cotton, a single strand of hemp, a bundle of tencel, a bundle of rabbit velvet, a bundle of triangular nylon, a single strand of four-hole polyester, a bundle of round nylon and a bundle of multi-section polyvinyl chloride fiber The slice thicknesses were all 15 μm.

[0049] Its electron...

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Abstract

The invention discloses a method for manufacturing fiber cross section slices. The method comprises the following steps: adding quickly-dried adhesive to the bottom part of a holding container, putting single fiber or one beam of fibers on the surface of the quickly-dried adhesive or putting the fibers on the surface of the quickly-dried adhesive along the length direction of the holding container after the quickly-dried adhesive is slightly dried, and embedding two ends of the fibers into plasticine at two ends of the holding container; then continuing to dropwise add the quickly-dried adhesive until the fiber is covered by the adhesive; removing the holding container and the plasticine after the quickly-dried adhesive is cured so as to obtain fiber-coated adhesive rods; slicing the adhesive rods to obtain the fiber cross section slices. The method for manufacturing the fiber cross section slices has the advantages that the fibers are coated by the quickly-dried adhesive, so that the requirements on detecting cross sections of a slight amount of fibers or a single fiber can be met; the fibers in the fiber cross section slices manufactured by the method are good in dispersion properties and clear and accurate in shape of the cross sections; the method is simple and convenient and high in practicability, and can be widely used in field of forensic science at home and abroad.

Description

technical field [0001] The invention relates to a fiber quick-drying glue embedding method, which belongs to the technical field of forensic science. Background technique [0002] Fiber is one of the most common physical evidence in many cases such as homicide, theft, robbery, and traffic accidents. As the awareness and technology of on-site investigators' physical evidence extraction continue to increase, more and more fiber evidence is involved in cases, but these fibers are often trace amounts. How to test microfiber evidence and enhance its value has become a problem that needs to be solved and faced in the field of forensic science. [0003] At present, the inspection methods of fiber evidence in the field of forensic science at home and abroad mainly include: (1) Stereo microscope method: conduct a preliminary inspection of fiber color, thickness, and curl; (2) Polarized light microscope method: distinguish fibers according to their interference characteristics (3) I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
Inventor 石慧霞刘占芳李海燕郭洪玲陶克明孙玉友权养科
Owner INST OF FORENSIC SCI OF MIN OF PUBLIC SECURITY
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