CN207400742U - A kind of gel-type impression of the hand extracts film - Google Patents
A kind of gel-type impression of the hand extracts film Download PDFInfo
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- CN207400742U CN207400742U CN201720226113.2U CN201720226113U CN207400742U CN 207400742 U CN207400742 U CN 207400742U CN 201720226113 U CN201720226113 U CN 201720226113U CN 207400742 U CN207400742 U CN 207400742U
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Abstract
The utility model discloses a kind of gel-type impressions of the hand to extract film.The gel-type impression of the hand extraction film includes the base material, viscogel colloid layer and the protective film that are attached onto successively；The material of base material is polyurethane base material, and thickness is 0.75~0.85mm；The material of viscogel colloid layer is gel rubber material, and thickness is 0.9~1mm；Protective film is transparent polyethylene terephthalate film, and thickness is 0.09~0.11mm.The utility model impression of the hand extraction film not only can directly extract the fresh and outmoded latent fingerprint on impermeability object or semi-permeable object, show, also the impression of the hand for having shown processing can be extracted, fixed, can effectively overcome the influence of object surface curve, coarse, reflective and polychrome to fingerprint displaying.While being extracted using the new impression of the hand extraction film of the utility model to object surface impression of the hand, film face can also be extracted simultaneously to contact DNA material evidences and trace material evidence, harmful effect will not be generated to subsequent survey, can be used as the method for other method before processings.
Description
Technical field
The utility model is related to a kind of gel-type impression of the hand extraction film and its applications, belong to criminal technique field.
Background technology
Impression of the hand has the characteristics that people is variant, unchangeable and tactile object trace.Hand print identification is to carry out personal identification most
One of reliable method is used for investigating, disclose and confirming crime in forensic science.Science correctly extracts that show fingerprint split
Opening up investigation and carrying out the judicial adjudication has important practice effect.
In fingerprint displaying technical field, usually to oil, sweat and the mixed impression of the hand one in impermeability or semi-permeable object
As using significant powder brush or 502 it is smoked aobvious the methods of shown.However, it to be done when impression of the hand object surface is rougher, there are background colours
It disturbs or when surface curvature degree is larger, is often difficult to obtain that contrast is apparent, details is clear using significant powder brush or 502 fumigating and appearing methods
Impression of the hand, need to further carry out transfer extraction to shown impression of the hand using adhesive tape or silicon rubber or dyeing could obtain it is more clear
Clear handprint images.Using above method carry out impression of the hand extraction not only it is cumbersome, certain pollution is easily caused to sample object
And destruction, and chemical reagent used is also unfavorable for the health of operating personnel.For this purpose, criminal technique personnel once prepared the " back of the body
The a series of gummed paper class impression of the hand such as gummed paper ", " DT gummed papers " and " criminal investigation gummed paper " extracts equipment to show impression of the hand, but due to glue
The limitation of paper colloid viscosity, thickness and substrate intensity etc., these equipment easily become in impression of the hand is extracted there are material
Shape, it is viscous take hyperenergia, the deficiencies of out-of-flatness of gummed paper background and trace contrast are smaller, application range is relatively narrow and use more not
Just, fail to be widely applied.
Utility model content
The purpose of this utility model is to provide a kind of gel-type impression of the hand extraction film, and the gel-type impression of the hand extraction film can
In showing for impression of the hand extraction, available for various body surfaces, including impermeability surface and semipermeability surface, particularly song
Face and coarse object surface, solve the problems, such as current fingerprint displaying extraction, and the utility model gel-type impression of the hand extraction film has
Simply, it is quick, lossless, environmentally friendly, inexpensive, highly sensitive, be applicable in object it is extensive the advantages that.
Impression of the hand provided by the utility model extracts film, including base material, the viscogel glue being attached onto successively
Body layer and protective film.
In above-mentioned impression of the hand extraction film, the thickness of the base material can be 0.75~0.85mm, concretely 0.8mm；
The thickness of the viscogel colloid layer can be 0.9~1mm, concretely 0.95mm；
The thickness of the protective film can be 0.09~0.11mm, concretely 0.1mm.
In above-mentioned impression of the hand extraction film, the material of the base material can be polyurethane base material, and internal layer surface has tension
Stretch fibres for fabrics.
In above-mentioned impression of the hand extraction film, the viscogel colloid layer is formed by the gel rubber material.
In above-mentioned impression of the hand extraction film, the protective film can be transparent polyethylene terephthalate (PET) film.
Impression of the hand extraction film described in the utility model can be prepared by the following method：
The gel rubber material, coated on the base material, forms the viscogel colloid layer after melting；Described viscous
The protective film is covered on property gel colloidal layer to obtain the final product.
In above-mentioned preparation method, the gel rubber material is heated to 70~75 DEG C to its melting；
Before coating step, the method further includes the step of carrying out negative pressure evaporation to the gel rubber material, the negative pressure
The pressure of evaporation can be 1~10kPa, concretely 5kPa.
In above-mentioned preparation method, gear pump can be used and coat the gel rubber material；
Laminating machine can be used and cover the protective film.
The gel rubber material that the utility model uses has the property that：
(1) gel rubber material is black glossy object under normal light irradiation, is black-rufous under strong illumination
Gloss object, the reflecting rate of the gel rubber material as prepared by one embodiment of the utility model is 14%, absorptance 85%, folding
Rate is penetrated as 21%.
(2) viscous force of the gel rubber material is moderate, and the first of the gel rubber material as prepared by one embodiment of the utility model is glued
Power is 67.7N, holding power 77.4N, peel strength 0.036KN/m.
(3) gel rubber material has the characteristic of water oil parents, such as the gel material prepared by one embodiment of the utility model
The water absorption rate of material is 0.45g/g, oil absorbency 0.12g/g.
(4) preferably, the gel rubber material as prepared by one embodiment of the utility model is in 500N for the elasticity of the gel rubber material
Decrement during pressure is 18%, amount of elasticity 97%, has the characteristics that draw high morphotropism small (tensile strength 0.28MPa).
The gel rubber material that the utility model uses can be prepared according to the method included the following steps：
(1) gelatin and agar are soaked in water and obtain colloidal solution；
(2) glycerine is added in into the colloidal solution and obtains colloid mixed solution；
(3) the colloid mixed solution obtains clear gel colloid after evaporation and cooling；
(4) reactive dye are added in into the clear gel colloid and crosslinking agent carries out cross-linking reaction, are then through evaporation
Obtain the gel rubber material.
In above-mentioned preparation method, in step (1), the mass ratio of the gelatin and the agar can be 5.5~6.5：1,
Concretely 5.5：1；
The water can be deionized water；
The temperature of the immersion can be 20~25 DEG C, concretely 25 DEG C, the time can be 12~18 it is small when, concretely
12 it is small when；
The colloidal solution is in colorless and transparent.
In above-mentioned preparation method, in step (2), the mass ratio of the glycerine and the gelatin can be 1：2.5~3.5,
Concretely 1：2.5；
Add in after the glycerine, the method further includes the step of being stirred at 60~70 DEG C, speed of agitator for 80~
160 revs/min, so that each component is uniformly dispersed to form homogeneous mixed solution.
In above-mentioned preparation method, before step (3), the method, which further includes, is filtered the colloid mixed solution
The step of, to remove not molten impurity and insoluble residue in the colloid mixed solution；
In step (3) and step (4), the evaporation is by the way of negative pressure evaporation, to remove moisture therein；
The pressure of the negative pressure evaporation can be 1~10kPa, concretely 1.5kPa.
In above-mentioned preparation method, in step (4), the reactive dye can be active black dye, such as active black
WNN200%；
The crosslinking agent is polycarbodiimide (XR-201)；
The mass ratio of the gelatin, the reactive dye and the crosslinking agent can be 1：0.004~0.005：0.005~
0.006, concretely 1：0.004：0.005；
The temperature of the cross-linking reaction can be 45~50 DEG C, concretely 45 DEG C, when the time can be 0.5~1 small, specifically may be used
For 1 it is small when.
The stained gel colloid with good elasticity is obtained by step (4).
When the utility model impression of the hand extraction film carries out impression of the hand extraction, it can carry out in accordance with the following steps：
(1) impression of the hand extraction film is suitably cut, and peels off the protective film of film face, described in exposing
Viscogel colloid layer；
(2) since the impression of the hand extraction film one end cut out, the viscogel colloid layer end is pasted on and waits to carry
The object surface of impression of the hand is taken, then makes remaining impression of the hand extraction film is slowly smooth to stick on object surface, is completely covered
Institute's handle print；The impression of the hand extraction film is pressed afterwards to be allowed to come into full contact with the surface of the object；
Carried out with roll shaft, scraping blade etc. catching up with pressure during sticking, discharge contributed to paste the bubble of middle generation, make film with
Object surface obtains good contact；
(3) since the at one end of impression of the hand extraction film, institute is slowly carefully peeled from object in one direction
Impression of the hand extraction film is stated, then realizes that the transfer to impression of the hand on the surface of the object is extracted.
The viscogel colloid layer surface of impression of the hand extraction film is upward, impression of the hand is carried under the lighting condition of darkroom
The impression of the hand for shifting extraction on film face is taken to carry out observation and fixation of taking pictures.
Impression of the hand extraction film described in the utility model shows the extraction of latent fingerprint, and the principle of institute's foundation is：
Impression of the hand legacy is carried out by colloidal materials it is viscous take transfer after, optical inspection method is recycled to carry out fixation of taking pictures
Physical method, as shown in Figure 3.The utility model impression of the hand extracts film because its (PU) base material is relatively soft, viscogel colloid layer
It is elastic preferably and thickness is moderate, so impression of the hand extraction film is affixed on after object surface gently presses and comfort, film is not only whole
It can occur bending and deformation in the horizontal direction and trace is pasted, while the viscogel colloid layer can also be sent out in vertical direction
Raw elastic deformation is filled object recess, this enables new impression of the hand extraction film provided by the utility model intactly
The impression of the hand for extracting the difficult object surface such as coarse and curved surface leaves substance, so as to which impression of the hand legacy part on object is transferred to glue
Piece surface forms the secondary transferring trace for being easy to observation.Since impression of the hand extracts film white space to reflection and the absorption of light
Diffusing reflection of the impression of the hand substance extracted to light makes the viscous impression of the hand taken on impression of the hand extraction film have under light illumination with footage background
Good contrast forms clearly handprint images.
The utility model impression of the hand extraction film has easy to operate, easy to use, applied widely and harmless to the person
Feature is suitble to promote the use of in criminal investigation department.The utility model impression of the hand extraction film not only can be directly to impermeability visitor
Fresh and outmoded latent fingerprint on body or semi-permeable object is extracted, shown, also can be to having shown the hand of processing
Print is extracted, fixed, and can effectively overcome the influence of object surface curve, coarse, reflective and polychrome to fingerprint displaying.This
Outside, while being extracted using the utility model new impression of the hand extraction film to object surface impression of the hand, to contact DNA material evidences and
Trace material evidence can also extract film face simultaneously, thus use camera the trace that film extracts is carried out take pictures it is fixed after,
Constituent analysis identification can be carried out with trace material evidence to gluing the DNA taken thereon, harmful effect will not be generated to subsequent survey, can made
It is used for the method for other method before processings.
Description of the drawings
Fig. 1 is the preparation technology flow chart that the utility model impression of the hand extracts film.
Fig. 2 is the structure diagram that the utility model impression of the hand extracts film, is respectively marked in figure as follows：
1 polyurethane base fabric, 2 viscogel colloid layers, 3PET protective films.
Fig. 3 is that the utility model impression of the hand extracts the principle schematic that film shows impression of the hand.
Fig. 4 is the method schematic diagram that film extraction impression of the hand is extracted using the utility model impression of the hand.
Fig. 5 is to extract the observation of impression of the hand and fixed method schematic diagram to extracting film using the utility model impression of the hand.
Specific embodiment
Experimental method used in following embodiments is conventional method unless otherwise specified.
The materials, reagents and the like used in the following examples is commercially available unless otherwise specified.
The preparation of embodiment 1, gel rubber material
Gel rubber material (i.e. gel colloidal) is prepared according to flow shown in FIG. 1.
(1) it is 5.5 by mass ratio：1 gelatin and agar is added in deionized water, is impregnated under conditions of about 25 DEG C or so
12 it is small when, form the colloidal solution of water white transparency.
(2) colloidal solution and glycerine are added in reaction kettle, to be stirred under conditions of temperature is 60 DEG C, with 100
Rev/min rotating speed each component is made to be uniformly dispersed, formed colloid mixed solution；Wherein the mass ratio of glycerine and gelatin is 1：2.5.
(3) colloid mixed solution is filtered using two layers of 80 mesh stainless steel mesh, removed in colloid mixed solution not
Molten impurity and insoluble residue.
(4) the colloid mixed solution after filtering is inserted in reaction kettle and carries out negative pressure evaporation for the first time and to remove moisture, cool down
Clear gel colloid is formed afterwards, wherein, the pressure of negative pressure evaporation is 1.5kPa for the first time.
(5) by clear gel colloid after cooling and active black WNN200% and crosslinking agent polycarbodiimide (XR-
201) by formula, (mass ratio of gelatin, dyestuff and crosslinking agent is 1：0.004：0.005) add in reaction kettle, in 45 DEG C of condition
It is lower progress cross-linking reaction 1 it is small when.After reaction, the stained gel glue with good elasticity is formed through secondary negative pressure evaporation
Body, i.e. the utility model gel rubber material, wherein the pressure of secondary negative pressure evaporation is 5kPa.
Gel rubber material manufactured in the present embodiment is black glossy object under normal light irradiation, is black under strong illumination
Color-rufous gloss object, the reflecting rate of colloid layer is 14%, absorptance 85%, refractive index 21%.
Using GB/T 4852-2002 pressure-sensitive tape tack test methods (rolling ball method), GB/T 4851-2014 gluings
Band holds the test method of viscosity and the test method of GB/T 2792-2014 adhesive tape peel strengths, measures manufactured in the present embodiment
The initial bonding strength of gel rubber material is 67.7N, holding power 77.4N, peel strength 0.036KN/m, it is seen that it is moderate with viscous force
The advantages of.
Using the assay method of GB/T 1034-2008 plastic ink absorptions, the suction of gel rubber material manufactured in the present embodiment is measured
Water rate is 0.45g/g, uses dioctyl phthalate with reference to the assay method of GB/T 1034-2008 plastic ink absorptions, measures
The oil absorbency of gel rubber material manufactured in the present embodiment be 0.12g/g, it is seen that gel rubber material manufactured in the present embodiment its with water oil
The characteristic of parents.
Using the measure and GB/T 528-2009 vulcanization rubber or thermoplasticity of GB/T 1681-2009 vulcanization resilience of vulcanizate
The experimental method of rubber tensile ess-strain performance measures decrement of the gel rubber material manufactured in the present embodiment in 500N pressure
For 18%, amount of elasticity 97%, it is seen that its elasticity preferably, tensile strength 0.28MPa, it is seen that it has, and to draw high morphotropism small
Feature.
The preparation of embodiment 2, impression of the hand extraction film
Impression of the hand extraction film is prepared according to flow shown in FIG. 1.
(1) gel rubber material prepared by embodiment 1 is heated to 75 DEG C, carries out negative pressure evaporation (pressure 5kPa) and inject tooth afterwards
Wheel pump carries out the coating of colloid in polyurethane base fabric (PU) 1, forms viscogel colloid layer 2 (gel film).
(2) coated gel film is imported into laminating machine, in film face covering PET (polyethylene terephthalate)
Protective film 3, and it is packaged.
The structure diagram of impression of the hand manufactured in the present embodiment extraction film is as shown in Fig. 2, wherein, the thickness of polyurethane base fabric 1
It spends for 0.8mm, the thickness of viscogel colloid layer 2 is 0.95mm, and 3 thickness of PET protection film is 0.1mm.
When carrying out impression of the hand extraction using the utility model impression of the hand extraction film, it can carry out in accordance with the following steps, such as Fig. 4 institutes
Show：
(1) impression of the hand extraction film is suitably cut, and peels off the protective film of film face, expose viscogel
Colloid layer 2；
(2) since the impression of the hand extraction film one end cut out, 2 end of viscogel colloid layer is pasted on impression of the hand to be extracted
Object surface, then make remaining impression of the hand extraction film is slowly smooth to stick on object surface, institute's handle print is completely covered；Afterwards
Pressing impression of the hand extraction film is allowed to come into full contact with the surface of object；
Carried out with roll shaft, scraping blade etc. catching up with pressure during sticking, discharge contributed to paste the bubble of middle generation, make film with
Object surface obtains good contact；
(3) since the at one end of impression of the hand extraction film, impression of the hand is carefully slowly peeled from object in one direction and is carried
Film is taken, then realizes that the transfer to impression of the hand on the surface of the object is extracted.
(4) it is 2 surface of viscogel colloid layer of impression of the hand extraction film is upward, impression of the hand is carried under the lighting condition of darkroom
The impression of the hand for shifting extraction on film face is taken to carry out observation and fixation of taking pictures, as shown in Figure 5.
Claims (1)
1. a kind of gel-type impression of the hand extracts film, it is characterised in that：It includes the base material, the viscogel glue that are attached onto successively
Body layer and protective film；
The material of the base material is polyurethane base material；
The thickness of the base material is 0.75~0.85mm；
The material of the viscogel colloid layer is gel rubber material；
The thickness of the viscogel colloid layer is 0.9~1mm；
The protective film is transparent polyethylene terephthalate film；
The thickness of the protective film is 0.09~0.11mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720226113.2U CN207400742U (en) | 2017-03-09 | 2017-03-09 | A kind of gel-type impression of the hand extracts film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720226113.2U CN207400742U (en) | 2017-03-09 | 2017-03-09 | A kind of gel-type impression of the hand extracts film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207400742U true CN207400742U (en) | 2018-05-25 |
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ID=62321706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720226113.2U Active CN207400742U (en) | 2017-03-09 | 2017-03-09 | A kind of gel-type impression of the hand extracts film |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207400742U (en) |
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2017
- 2017-03-09 CN CN201720226113.2U patent/CN207400742U/en active Active
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