CN110066588B - Paper ash shaping method - Google Patents

Abstract

The invention relates to a police investigation method, in particular to a paper ashes setting method. In order to solve the problems existing in the prior art that the paper ash has low strength, it is difficult to retain the shape, and at the same time, it is inconvenient to obtain information on the ash. The steps of the method of the invention are as follows: the first step is to cover the ashes in a relatively airtight container with the same air pressure as the outside world; the second step is to atomize the polyamine by using an ultrasonic atomizing device, and deliver 0.4-4 min in 3-5 min. 0.8g of atomized polyamine fills the container space of 0.1-0.3m ³ , and the polyamine gathers into a thin layer on the surface of the ash; in the third step, the polyisocyanate is atomized by an ultrasonic atomizing device, and 0.4 ‑0.8g of atomized polyisocyanate fills the container space, and the polyisocyanate gathers into a thin layer on the surface of the ash; Step 4, use an infrared lamp to heat the container space, control the temperature to 50‑60℃, and the time is 6‑7min; Step 5 , repeat steps 2, 3, and 4 3-5 times, and the flaky ashes can be shaped.

Description

Paper ash shaping method

The technical field is as follows:

the invention relates to a police investigation method, in particular to a paper ash shaping method.

Background art:

paper, particularly writing and printing paper, plays an important role in transmitting information. In some special cases, in order to prevent the leakage of information, after reading characters on paper, the paper is burned, and after burning, the paper is difficult to gasify due to salt components therein, and thus, a flake-like ash residue is formed. In the process of burning the paper, because the chemical components of the writing are different from the chemical components of the paper, and the remaining components of the writing after burning are different from the remaining components of the burning of the paper, the writing on the paper can be kept on the ash because of the different remaining components. But paper ashes self intensity is lower, also can fracture under self action of gravity, even if blow through, also can be with the further breakage of ashes, so information on the characters can only have the reservation of short time after the burning, and the ashes shape is difficult to keep, and ashes are because self fragile can't turn, and information is inconvenient to read, even read, also can only acquire minute information quantity, make many investigation scene information finally to be omitted.

The invention content is as follows:

the invention provides a paper ash shaping method, which aims to solve the problems that the strength of paper ash is low, the shape is difficult to keep and the information on the ash is inconvenient to obtain in the prior art.

The technical scheme adopted by the invention for solving the technical problem is as follows: a paper ash sizing method comprises the following steps:

firstly, covering ash in a relatively closed container with the same air pressure as the outside air pressure;

secondly, atomizing polyamine by using an ultrasonic atomizing device, and conveying 0.4-0.8g of atomized polyamine to fill 0.1-0.3m in 3-5min³The polyamine is collected as a thin layer on the ash surface;

thirdly, atomizing polyisocyanate by using an ultrasonic atomizing device, conveying 0.4-0.8g of atomized polyisocyanate to fill the space of a container within 3-5min, and gathering the polyisocyanate into a thin layer on the surface of ash;

fourthly, heating the container space by using an infrared lamp, controlling the temperature to be 50-60 ℃ and the time to be 6-7 min;

and fifthly, repeating the second, third and fourth steps for 3-5 times, and shaping the flaky ash.

The polyamine refers to diethylenetriamine or triethylene tetramine; the polyisocyanate is an isocyanate having two or more isocyanate groups.

The polyisocyanate is isophorone diisocyanate (IPDI), Hexamethylene Diisocyanate (HDI) or HDI trimer.

Compared with the prior art, the invention has the advantages that:

1. shape retention of ash is achieved: the polyisocyanate selected under the invention contains isocyanate groups with higher reactivity and can react with substances containing active hydrogen, the isocyanate and the amino compound can quickly react, and particularly the polyisocyanate and the polyamine can react to generate macromolecules containing a network structure. The macromolecule with the network structure forms a transparent film structure with good toughness after forming a film, and the film structure is attached to the surface of ash to form an extremely thin adsorption layer. The quality of the extremely thin adsorption layer is extremely low, and the ash cannot be broken due to the weight of the adsorption layer but can be wrapped by the ash, so that the ash is fixed.

2. And (3) ash setting is realized: the physical strength of the polymer layer which is too thin is not enough, so that the ash surface is prevented from bearing too much reaction raw materials before the polymer coating layer is not formed to cause the ash to be broken, and the thickness of the coating layer on the ash surface is gradually increased by adopting multiple times of spraying, so that the ash is shaped.

3. When the ash is in a single piece shape, the ash can be conveniently moved and is not easily broken. When the ash is in a multi-page superposed state, the pages can be conveniently separated without damaging the whole structure of the pages.

4. The method can be applied to police exploration, and can be used for improving the strength of paper sheets when the paper sheets are dispersedly distributed and the paper sheets are too low to transfer due to worm damage, dampness and the like in the protection of paper sheets and cultural relics.

The specific implementation mode is as follows:

the present invention will be described in detail below with reference to specific examples.

Example 1

A piece of common printing paper is taken, written with a gel pen, and then placed on a ceramic tile platform to be ignited and incinerated to ash by a lighter. The method for shaping the ash comprises the following steps:

firstly, covering the ash in a 50cm multiplied by 50cm glass box with an opening at the bottom and air holes respectively arranged on the side surface, ensuring that the ash can not be blown away by outside wind in the operation process, and the air holes are used for facilitating the spraying operation.

And secondly, atomizing the triethylene tetramine by using an ultrasonic atomizing device, filling the glass box with the triethylene tetramine fog through air holes, and gathering the triethylene tetramine on the surface of ash through sedimentation and adsorption to form a thin layer. 0.5g was sprayed in a glass box over a period of 3 min.

Thirdly, isophorone diisocyanate (IPDI) is atomized by an ultrasonic atomization device, and the IPDI mist fills the closed space obtained in the first step through the air holes. The IPDI is collected in a thin layer by settling or adsorption on the ash surface. 0.5g was sprayed in a glass box over a period of 3 min.

Fourthly, the infrared lamp is used for heating the glass box to control the temperature at 50 ℃ so as to promote the reaction to be accelerated. The reaction time was maintained for 6 min.

And fifthly, repeating the second, third and fourth steps for 3 times, and shaping the flaky ash to be difficult to break.

The obtained ash can be kept in a wide and closed evidence box, and characters on the ash can be observed and read by optical equipment at any time.

Example 2

Tearing a paper page printed with characters from the book, placing the paper page on a ceramic tile platform, and igniting and burning the paper page to form ash by using a lighter. The ash is shaped as follows:

firstly, covering the ash in a 40cm x 50cm glass box with an opening at the bottom and air holes respectively arranged on the side surfaces, and ensuring that the ash is not blown away by outside wind in the operation process.

And secondly, atomizing diethylenetriamine by using an ultrasonic atomization device, filling the glass box with the diethylenetriamine fog through air holes, and gathering the diethylenetriamine on the surface of the ash to form a thin layer through sedimentation and adsorption. 0.4g was sprayed in a glass box over a period of 3 min.

And thirdly, atomizing Hexamethylene Diisocyanate (HDI) by using an ultrasonic atomizing device, and filling the sealed space obtained in the first step by the HDI mist through an air hole. HDI accumulates as a thin layer by settling or adsorbing to the ash surface. 0.4g was sprayed in a glass box over a period of 3 min.

Fourthly, the infrared lamp is used for heating the glass box to keep the temperature at 50 ℃ and promote the reaction to be accelerated. The reaction time was maintained for 7 min.

And fifthly, repeating the second, third and fourth steps for 5 times. The flake ash can be shaped and is not easy to break.

The obtained ash can be kept in a wide and closed evidence box, and characters on the ash can be observed and read by optical equipment at any time.

Example 3

A used paper sheet is torn from the student exercise book, placed on a ceramic tile platform and ignited by a lighter until the used paper sheet becomes ash. The ash is shaped as follows:

firstly, covering the ash in a 60cm x 100cm x 50cm glass box with an opening at the bottom and air holes respectively arranged on the side surfaces, and ensuring that the ash is not blown away by outside wind in the operation process.

And secondly, atomizing diethylenetriamine by using an ultrasonic atomization device, filling the glass box with the diethylenetriamine fog through air holes, and gathering the diethylenetriamine on the surface of the ash to form a thin layer through sedimentation and adsorption. 0.8g was sprayed in a glass box over a period of 5 min.

Thirdly, the HDI tripolymer is atomized by the ultrasonic atomization device, and the sealed space obtained in the first step is filled with the HDI tripolymer fog through the air hole. HDI trimers aggregate into thin layers by settling or adsorption to ash surfaces. 0.8g was sprayed in a glass box over a period of 5 min.

Fourthly, the infrared lamp is used for heating the glass box to maintain the temperature at 60 ℃ and promote the reaction to be accelerated. The reaction time was maintained for 6 min.

And fifthly, repeating the second, third and fourth steps for 4 times. The flake ash can be shaped and is not easy to break.

The obtained ash can be kept in a wide and closed evidence box, and characters on the ash can be observed and read by optical equipment at any time.

Claims (1)

1. A paper ash sizing method comprises the following steps:

firstly, covering ash in a relatively closed container with the same air pressure as the outside air pressure;

secondly, atomizing polyamine by using an ultrasonic atomizing device, and conveying 0.4-0.8g of atomized polyamine to fill 0.1-0.3m in 3-5min³The polyamine is collected as a thin layer on the ash surface;

thirdly, atomizing polyisocyanate by using an ultrasonic atomizing device, conveying 0.4-0.8g of atomized polyisocyanate to fill the space of a container within 3-5min, and gathering the polyisocyanate into a thin layer on the surface of ash;

fourthly, heating the container space by using an infrared lamp, controlling the temperature to be 50-60 ℃ and the time to be 6-7 min;

fifthly, repeating the second, third and fourth steps for 3-5 times, and shaping the flaky ash;

the polyamine refers to diethylenetriamine or triethylene tetramine; the polyisocyanate is isocyanate containing more than two isocyanate groups;

the polyisocyanate is isophorone diisocyanate (IPDI), Hexamethylene Diisocyanate (HDI) or HDI trimer.