CN2274029Y

CN2274029Y - Multifunction static pick-up film for flat dust foot printing

Info

Publication number: CN2274029Y
Application number: CN96226365U
Authority: CN
Inventors: 张维占; 高以群; 杨兆坤
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-05-24
Filing date: 1996-05-24
Publication date: 1998-02-11
Anticipated expiration: 2006-05-24

Abstract

The utility model belongs to the technical field of criminal investigation, which is heated together by the surface of aluminizing plastic films and the ink layer surface of plastic films. The utility model has the advantages of high voltage resistance, large capacity, strong electrostatic holding ability, the pick-up voltage is uniformly distributed on the pick-up film, consequently large adsorption efficiency is generated, the utility model is suitable for various types of object surfaces, such as cement floor, wooden floor, plastic floor leather, chemical fiber carpet, pure wool carpet, etc., specially the pick-up effect on the irregular surface foot printing is more ideal than other pick-up boards, simultaneously the pick-up in a large area can be taken, and the utility model uses any high voltage electrostatic pick-up devices for the pick-up, such as various batons, extractors, etc.

Description

Multi-functional plane dust footprint static extracts film

This novel criminal investigation technical field that belongs to, particularly a kind of multi-functional plane dust footprint static extracts film.

In criminal case investigation, the on-the-spot occurrence rate of plane dust footprint is the highest, is the important trace evidence of often finding and extracting in the reconnaissance at criminal scene, identifies that by analysis can be solving criminal cases draws the line, assert that suspect etc. gives a clue.Current modern furniture and ornament materials generally all are insulant, as pure wool carpet, chemical fibre carpet, artificial flooring laminate, various types of resins plate and ceramic tile etc., many places are in the indoor seasoning environment, therefore the electrostatic potential that is produced by walking can accumulate for a long time on the object surface and be difficult for releasing, not only increased surface adsorption power, and often offset during on-the-spot the extraction and be applied to the electrostatic potential that extracts on the plate, extract power and reduce electric field, cause extraction effect not good, the footprint that occur to extract is imperfect, unintelligible even extract less than footprint.At present, extract plate with the matching used footprint of static extraction apparatus in the reconnaissance at criminal scene, function is more single, has certain limitation, as: adapt to the hardboard that extract on the plane, be difficult to adapt to uneven surperficial object; The sponge foam class that adapts to uneven surperficial object is extracted plate, and uncomfortable again should have corner angle or the bigger object of curved surface, and in a word, they all have deficiency on reaction footprint characteristics and definition, limited the utilization rate of footprint material evidence to a great extent.

The purpose of this utility model provides a kind of multi-functional plane dust static extraction film that various difform surperficial objects extraction footprints are used that adapts to.The technical solution of the utility model is as follows: the thickness that is formed by aluminium coated, plastic foil and plastic printing ink layer, plastic foil heat seal is the thin film of 0.02～0.10mm.

This utility model is that present optimal static extracts film, be characterized in withstand voltage height, capacity is big, the static hold facility is strong, extraction voltage is dispersed in uniformly to be extracted on the film, thereby produce bigger adsorption efficiency, it can be crooked arbitrarily, adapt to the cement flooring, wood floors, plastic floor leather, chemical fibre carpet, various types of objects surfaces such as pure wool carpet, especially for rough and uneven in surface surface (comprising the right angle curved surface), it is even more ideal that extraction effect extracts plate than other, simultaneously can do large-area extraction, it can use any one high-pressure electrostatic extraction apparatus to extract, as all kinds of batons, extraction apparatus etc.

Fig. 1, this utility model structure cutaway view.

Be further described in conjunction with the accompanying drawings: it is raw material that this utility model can adopt polyester film or polychlorostyrene film; aluminium coated 1 is arranged on the polyester film 2; its thickness is 0.03mm; printing ink layer 3 is arranged on the polychlorostyrene film 4; its thickness is 0.05mm; the face of the polyester film 2 of band aluminium coated 1 and ink lay 3 fever sensation of the face of polyester film 4 close; make static and extract film; gross thickness is 0.08mm; when reconnaissance at criminal scene extracts footprint, static is extracted the aluminium coated film aspect upwards be layered on the on-the-spot place of crime footprint, can use any one high-pressure electrostatic extraction apparatus; as all kinds of batons; extraction apparatuses etc. extract, and criminal's footprint can be extracted in static clearly and extract on the film.

Claims

1, a kind of multi-functional plane dust footprint static extraction film is characterized in that it is that the thickness that is formed by aluminium coated (1), plastic foil (2) and plastic printing ink layer (3), plastic foil (4) heat seal is the thin film of 0.02～0.10mm.

2, dust static extraction film in a kind of multi-functional plane according to claim 1 is characterized in that said plastic foil (2) and plastic foil (4) can adopt the plastic foil of identical material, also can adopt the plastic foil of unlike material.