Agent for separating adhesive tape from carrying surface

FIELD: chemistry.

SUBSTANCE: agent for separating adhesive tape from carrying surface is characterised by that, the agent used is petroleum ether which provides temporary loss of adhesion properties of the adhesive tape when deposited, while preserving initial structure of the adhesive layer after separating the tape from the surface.

EFFECT: efficient and fast separation of adhesive tape from surface, with preservation of initial structure of adhesive layer, thus providing efficient detection of traces on the adhesive tape during crime detection.

1 ex

 

The technical field to which the invention relates.

The invention relates to forensics (forensic engineering), namely to the field of thracology (fingerprinting), and can be used as a means for the Department of sticky tape from various surfaces, as well as for separation or separation of the glued together pieces of masking tape with the preservation of its technological properties (integrity and consistency of the adhesive layer) for subsequent detection and identification of traces of the hands on the surface of the adhesive side of the tape.

The level of technology

Currently adhesive (sticky) tape ("Scotch") is widely used not only in commercial, residential, industrial spheres of human activity, but when committing crimes. For example, adhesive tape criminals wrapped invalid handle knives, guns, the butts of their rifles, with the help tie the hands and feet, close my eyes and mouth of the victim. All this is undertaken in order to facilitate the Commission of a crime.

Adhesive tape has specific properties that complicate the identification of existing on its surface invisible podozerovym traces hands. It is, first, the impossibility of processing the adhesive side of the tape fingerprint powders (the most common way OBN is pursued invisible traces of hands), secondly, in strong bonding between the layers of tape, which complicates the procedure of exfoliation of the layers from each other to detect on their surface traces of the hands.

Usually the adhesive (sticky) tape wound on the object in several layers.

In forensic practice currently used mainly film adhesive materials - glutinous (sticky) tape used in everyday life, which usually contain two layers - the base layer and stickiness. As the last in the existing films are mainly used compositions based on low-molecular and high-molecular compounds (gum rosin, cellulose ethers, chloroprene, isoprene, isobutilene, the best choice rubbers, phenol-formaldehyde, acrylic and other resins).

The basis of such films is composed of polyvinyl chloride, cellophane, polyethylene, polietilentereftalata paper and other

Currently, the adhesive tape can be removed with the bearing surfaces or separated in any of four ways:

- heated;

- physical;

- the use of volatile solvents;

- cooling.

Using heat to separate the adhesive tape entails damage to her sticky layer with an almost absolute loss traces hands left by the offender at its adhesive layer. Because this is about the Department has no real use in forensic practice.

Physical (mechanical) way of separating the adhesive tape through the substrate from the surface also leads to extensive damage to the adhesive (sticky) layer with fingerprints, because the force of adhesion (adhesion) of the adhesive layer with the surface exceeds the force pulling it from the surface.

You know the tool "Off Label 50" for separating the adhesive tape from various surfaces by dissolving and neutralizing the adhesive component. This uses volatile mineral solvent, which after some time, leaves no residue on the surface.

Label Off 50 - Tool for removal of self-adhesive labels and tape residue. Technological materials KONTAKT CHEMJE. Manufacturer CRC Jndustries Europe NV, Belgium).

The main purpose of the use of specified funds - preserving the purity of the surface, from which a branch of the adhesive layer while the adhesive as a result of partial dissolution is not saved, and therefore, the Label Off 50 may not be used in forensic practice to separate the adhesive tape from the surface or separation of the adhesive layers, since you can't save, to detect and identify traces of the hands on the adhesive layer.

You know the tool that corresponds to the task of maintaining the adhesive layer. It is a mixture of volatile solvents, which according to the ACLs of company "Sirchie", includes solvent, such as butylbenzylphthalate (5-10%), chloroform, 5%, toluene 30-60%, poly(butylmethacrylate - co-methyl methacrylate) (d) 30-60%.

(The means for separating the film "UN-du Adhesive Removal System" preserving traces of the hands of the firm "Sirchie Finger Print labs (USA), catalog number UN-DU 100).

It is known that toluene is among the toxic products of the third class of danger, and to the number of flammable and explosive products, vapours are narcotic, harmful effect on the nervous system, are irritating to skin and mucous membranes of the eye. It is necessary to use personal protection: filter respirator with box brand and BKF, goggles, rubber gloves, protective clothing, protective ointments and pastes.

Chloroform, blended with "UN-DU", as dangerous as improper or prolonged storage it can form phosgene, causing poisoning. In addition, chloroform may cause harmful effects on the liver and kidneys, and cause heart disorder.

In addition, the above-mentioned means, according to the company "Sirchie"cannot be used for separating the adhesive tape from leather and suede products.

The most effective tool in forensic practice to separate the adhesive tape from the surface is n the applicatio liquid nitrogen either through the plate, chilled with liquid nitrogen, or using an aerosol jet.

However, this method has many disadvantages and limited in scope.

Thus, with the use of liquid nitrogen should be taken special precautions both during storage and during use: wearing a face mask, special gloves, etc. When this nitrogen can be applied only on a limited area due to the inability cooling of large volumes of physical bodies and cannot be used for separation (separation) of one layer of masking tape from the other, and in relation to living persons, wrapped adhesive tape ("Home Office building a safe, just and tolerant society Scientific Development Branch Investigation Enforcement and Protection Sector", March 2006 Publication No. 23/06 "Additional Fingerprint Development Techniques for Adhesive Tapes Abstract").

The technical result of the invention is the expansion of the means used for separating the adhesive tape from the surface, and relatively less dangerous and provide efficient and rapid separation of the adhesive side of the tape from any surfaces with the preservation of its technological properties.

The invention

This technical result is achieved by the fact that as a means of separating the adhesive tape from the carrier surface applied petroleum ether With5-C6isotrate.

Petroleum ether is a liquid mixture nassen the x hydrocarbons (mainly 5-C6), obtained by re-distillation of gasoline by separating the light fraction (Glinka D., General chemistry. Edition 16-e, revised L., "Chemistry", 1974, str). Petroleum ether used as solvent for resins, fats, oils (Folder K.K., Ragozin N.A. "Dictionary of fuels, oils, lubricants, additives and special liquids. 4 ed., M., 1975, s).

However, as a means for separating the adhesive tape from the surface and separation of the adhesive (sticky) side of each other this liquid mixture is not used.

Moreover, in the mentioned case of petroleum ether used as a solvent. The effect of this liquid substance is based on the effect of temporary loss of adhesion properties of the adhesive tape in the short-term saturation of its sticky (adhesive) layer with petroleum ether. Due to this separation sticky (adhesive) layer of the tape while maintaining its original structure and its traces hands. As a result of rapid evaporation of the petroleum ether is observed subsequent full recovery of all properties of a sticky tape 30-40 seconds after applying the specified funds. Thus the traces of the hands and other external influences also completely preserved.

The use of petroleum ether to separate the adhesive tape from the supporting surface the TEI is as follows.

Between the adhesive tape and the surface is applied with a capillary petroleum ether and gradually wetting the adhesive (sticky) layer, separating the tape from the surface.

After separation of the tape in expanded form dry for 2-3 minutes, after which it is ready for further forensics. It can be carried out not only in terms of the forensic lab, but also in the examination of the scene.

To ensure safety when working with petroleum ether sufficient to use the respirator type "Petal" and medical or polyethylene gloves.

Currently, the tests proposed tools (code name "Sticker") in forensic centers, including the Ministry of internal Affairs of the Republic of Belarus and the Ministry of internal Affairs of the Russian Federation (copies attached).

Tests have shown that our proposed tool allows you to quickly and efficiently share glued together adhesive (sticky) tape and separate them from the carrier surface with preservation of existing adhesive (sticky) layer of traces of hands for further expert study.

Means for separating the adhesive tape from the bearing surface, characterized in that as a means of using petroleum ether, thereby providing him applying the lie is nnow loss of adhesion properties of the adhesive tape while maintaining the original structure of the adhesive layer in the separation tape from the surface.



 

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