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A gel type footprint extraction film and its application
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A footprint and film technology, applied in the field of gel-type footprint extraction film, can solve problems such as interference, and achieve the effects of convenient use, wide application range and simple operation.
Active Publication Date: 2020-07-28
INST OF FORENSIC SCI OF MIN OF PUBLIC SECURITY
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[0004] The object of the present invention is to provide a gel-type footprint extraction film, which can be used for the extraction of plane footprints on various object surfaces, including curved object surfaces, rough object surfaces, and background color interference object surfaces , effectively solve the problem of extraction of existing plane footprints
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Embodiment 1
[0069] Embodiment 1, the preparation of gel material
[0070] according to figure 1 The procedure shown prepares gel materials (ie, gel colloids).
[0071] (1) Add gelatin to water and soak for 12 hours at about 25°C to form a translucent colloidal solution.
[0072] (2) Add the colloidal solution into glycerin, add it into the reaction kettle, heat and stir, the temperature is controlled at 60°C, the stirring speed is 80-160 rpm, after 30 minutes, add acetamide, and after the acylation reaction for 6 hours, Open the pipeline and filter the colloid through 100 mesh to obtain a colloid mixed solution.
[0073] Wherein, the mass ratio of gelatin and glycerin is 1:0.6, and the mass ratio of gelatin and acetamide is 1:0.05
[0074] 3) Put the filtered colloid mixed solution into the reaction kettle for heating, vacuumize and dehydrate.
[0075] 4) The dehydrated colloid is discharged from the reaction kettle to be filtered and cooled to form an elastic light yellow translucen...
Embodiment 2
[0081] Embodiment 2, the preparation of footprint extraction film
[0082] according to figure 1 The shown procedure prepares footprint extraction films.
[0083] (1) Heat the gel material prepared in Example 1 to 75° C., and coat the colloid on the polyurethane base cloth (PU) to form a viscous gel colloid layer (gel film).
[0084] (2) Import the coated gel film into a laminating machine, cover the surface of the film with a PET (polyethylene terephthalate) protective film, and cut and package it.
[0085] For the footprint extraction film prepared in this example, the thickness of the polyurethane base cloth is 0.8 mm, the thickness of the viscous gel colloid layer is 0.85 mm, and the thickness of the PET protective film is 0.1 mm.
[0086] When using the footprint extraction film of the present invention to extract footprints, it can be carried out according to the following steps, such as image 3 Shown:
[0087] (1) Properly cut the footprint extraction film, and pe...
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Abstract
The invention discloses a gel type footprint extraction film and application thereof. The preparation method of the gel material includes the steps of: immersing gelatin in water to obtain a colloidalsolution; adding glycerin and acetamide into the colloidal solution in order, and carrying out acylation reaction to obtain a colloidal mixed solution; performing water treatment on the colloidal mixed solution, and then conducting cooling to obtain an elastic faint yellow translucent colloid; adding a reactive dye into the elastic faint yellow translucent colloid for dyeing, then adding a cross-linking agent for cross-linking reaction, and performing dehydration treatment, thus obtaining the product. The footprint extraction film provided by the invention has the characteristics of simple operation, convenient use, wide application range and no harm to the human body, and is suitable for popularization and use in criminal investigation departments. The footprint extraction film providedby the invention not only can directly extract and display dry and wet footprints on various objects, but also can synergistically extract exfoliated cells and trace material evidence in footprints, thus being a footprint extraction method with wide application scope, simple and convenient operation and excellent extraction effect.
Description
technical field [0001] The invention relates to a gel-type footprint extraction film and its application, belonging to the technical field of criminals. Background technique [0002] Footprints are the most common type of physical evidence at crime scenes, and they are of great value in case analysis and portrayal of criminal suspects. Therefore, it is necessary to use an appropriate method to extract and fix the on-site footprints to ensure the reflection of the detailed features in the footprints to the greatest extent. Scientifically and correctly extracting the footprints has important practical effect on the development of investigation work and judicial trial. [0003] In the field of footprint extraction technology, the plane footprints on the on-site objects are usually extracted by lighting and photographing, electrostatic adsorption and glued paper tape. However, when the surface of the footprint object is rough, the background interference of the object is stron...
Claims
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