Fibrous material to protect the paper from a fake

 

The material is designed to protect paper against forgery in the manufacture of, for example, documents and banknotes. Fibrous material from forgery contains cotton fiber and painted and unpainted profiled synthetic fibers, given their value. While the branching ratio of the cross sectional profile of cotton fibers equal 3,54-4,32, and synthetic fibers - 6,2-11,5. The technical result is the strength retention of protective fibers in the mass, neuregulirovannosti it while protecting. 6 Il.

The invention relates to fibrous materials, which are used to produce specialty paper.

Fibrous materials, for employees receiving regular paper are cellulose, viscose, cotton fibers and wood pulp.

To get the special paper used for the manufacture of valuable documents, banknotes, etc., you must enter the security features, as well as to improve its physical-mechanical properties in it enter cut synthetic fibers [1].

While synthetic fibers should be put firmly in the paper, evenly distributed in the I securities, containing paper of a fibrous material in which is embedded fiber pure cotton, as well as protection - colored fluorescent fibers [2].

However, a disadvantage of the introduction of synthetic fibers is their inability to form hydrogen bonds, which are mainly determined by the coupling strength between the milled fibers in the paper pulp.

Technical problem on which this invention is directed, is the creation of a fibrous material for the manufacture of paper for special purposes, in which the synthetic fibers should be put firmly in her and not to aggregate it, and to be protected.

The technical problem solved due to the fact that the fibrous material contains cotton fibers and synthetic dyed and undyed profiled fiber when following their ratio, wt.%: Cotton fiber - 70-99,85 Dyed synthetic fiber - 0,15-5 Unpainted synthetic fiber - 0-25 and cotton fiber has a branching ratio of the cross sectional profile of 3.54-4,32, and painted and unpainted fiber 6,2-11,5. The branching ratio of the cross sectional profile is determined by the formulawhere P is x characteristics of the inventive fibrous material, namely its composition, the use of the dyed fiber and the coefficient of branching of the cross-sectional profile of synthetic fibers is an important feature of this fibrous material and can be used for the manufacture of paper for special purposes.

The invention is illustrated in the drawings.

In Fig. 1 shows a cross-section profiles of cotton fibers in the form of an ellipse or "Bob"; Fig. 2, 3, 4 - cross-section profiles of dyed synthetic fibres, representing the truncated trilobal [3], or a truncated six-rayed star [4], or "comb" in the form of interconnected diamonds [5] ; Fig. 5 and 6 mutual arrangement of profiled fibers included in the paper a lot.

According to the present invention to improve the physical-mechanical properties of paper in it add or colored synthetic fiber asymmetrical cross-sectional profile having a certain value of the ratio of branching To ap. This coefficient is determined by the formula

where P is the perimeter of the cross-sectional profile;
S - area of the cross-sectional profile.

Coeff is Alannah synthetic fibers. The production cross sections are produced by using a microtome. The slices are placed on a glass slide and photographed using the camera built into the microscope MBI-15.

The perimeters on the pictures measure gauge and ruler, and recalculated taking into account the current ratio increase.

The square cross section of filament is determined by imposing on his photo printing stencil with a known area of the squares. When this count and summarize the number of whole and partial squares, occupied by the slice.

The ratio of branching ratios for cotton and synthetic dyed and undyed fibres determined experimentally.

For cotton elliptical profile and profile in the form of "Bob" (Fig. 1) when the branching ratio close to 3,54, elliptical profile tends to round, i.e. in this case the value of the minor axis of the ellipse is committed to the value of the semimajor axis. This significantly reduces the area of contact between adjacent fibers and prevents the attachment of the elliptic fibers in the space between the ray asymmetrical profiles of synthetic fibers.

The upper value of the coefficient R is eticheskikh fibers asymmetrical profile cross-section, presented on Fig. 2, 3, 4, when the value of the branching ratio <6,2 not achieved the desired irregular profiles, resulting is not necessary adhesion of these fibers with cotton, in addition, this increases the probability of aggregation of synthetic fibers.

When the branching factor > 11,5 due to high notched profiles are growing spatial difficulties with attachment elliptical fibers in the space between the ray asymmetrical profiles of synthetic fibres, resulting in lower areas of the contacts and of the adhesion forces between them. There is also the aggregation of synthetic fibers due to the strong coupling, the jagged asymmetrical profiles.

As synthetic fibers can be applied polyamide, polyester and other fibers.

As dyes for synthetic fibers introduced into the composition of fibrous material, use dyes that glow in UV and IR rays.

The obtained fibrous material determine the tensile strength and bond strength profiled synthetic fibers with the bulk of the cotton.

Tensile strength was determined according to GOST 15902.3-79 on a tensile testing machine "Instron what about the canvas was determined by the following method.

The source mass is a fibrous material obtained by paper-making technology and containing painted corrugated synthetic fiber. In place serving dyed threads do a cut and release the end of this thread a length of 5-6 mm Freed the thread end up on the clip breaking machine "Paragraph", which is a clip of Aderley. In the other clamp of the machine is charged directly to the paper canvas. During movement of the clamps is fixed force clutch profiled synthetic yarn with canvas, which is registered by the scale of the instrument [6].

The invention is illustrated by the following examples.

Example 1
Fibrous material was obtained wet paper-making method for the formation of the canvas of a suspension of fibers. The resulting paper is a fibrous material consisting of a mixture of fibers of an asymmetrical cross-sectional profile in the following ratio of components:
Cotton fiber elliptical and borovickova profiles, % - 70
Synthetic undyed fiber, % - 25
Synthetic dyed fiber, % - 5
The branching ratio by weight of cotton - 3,9
The branching ratio sinteticheskie dyed and undyed fibres are in the form of a truncated six-rayed star. The thickness of the material - 0,107 mm Tensile strength - 75-82 kg/cm2. Grip, synthetic fibers, paper pulp - 5,6-6,2 SN (g).

Example 2
Fibrous material was obtained paper-making method based on the suspension of fibers asymmetric profile in the following ratio of components:
Cotton fiber elliptical profile, % - 85
Synthetic undyed fiber, % - 14
Synthetic dyed fiber, % - 1
The branching ratio by weight of cotton - 3,8
The ratio of branching synthetic undyed fibers of 8.4
The ratio of branching colored synthetic fibres - 8,1
Synthetic dyed and undyed fibres are in the form of a truncated trilobal. The thickness of the obtained fibrous material of 0.133 mm Tensile strength - 68-72 kg/ cm2. The bond strength of synthetic fibers with a paper weight of 4.5-5.0 CH (g).

Example 3
Fibrous material was obtained paper-making method based on the suspension of fibers asymmetric profile in the following ratio of components:
Cotton fiber elliptical and borovickova profile, % - 99,85
Synthetic dyed fiber, % - 0,15
Ratios are the - 1,1
Synthetic dyed fibers have the form of a "comb" in the form of interconnected diamonds. The thickness of the obtained fibrous material - 0,140 mm Tensile strength - 51-54 kg/ cm2. Grip, synthetic fibers, paper pulp - 5,5-6,3 SN (g).

The inventive fibrous material, namely its composition, the use of profiled dyed and undyed fibres with defined ratios of branching of the cross-sectional profile can improve physical and mechanical properties of the material. Synthetic fibers are held tightly in paper, not aggregate in it. The presence of a colored synthetic fibers helps to protect the paper from the fake.

Sources of information
1. D. M. Plate. Properties of paper", ed. The forest industry, Moscow, 1976, PP 70-81.

2. Pat. RF 2170788, D 21 H 21/40, publ. 20.07.2001, B 20.

3. Auth. mon. The USSR 889755, D 01 D 1/02, publ. 15.12.81, BI 46.

4. Auth. mon. The USSR 1004491, D 01 D 4/02, publ. 15.03.83, B 10.

5. Pat. RF 2153032, D 01 D 5/253, publ. 20.07.2000, B 20.

6. "Friction textile yarn". Central Institute of scientific and technical information light industry, Moscow, 1966, pp. 8-10.


Claims

Fibrous material for zasio he further comprises undyed synthetic fibers, while the dyed and undyed synthetic fibers are profiled, and the ratio of fibers in the fibrous material the following, wt%:

Cotton fiber 70 - 99,85

Colored synthetic

fiber 0,15 - 5

Unpainted synthetic

fiber 0 - 25

moreover, the branching ratio of the cross sectional profile of cotton fibers equal 3,54-4,32, and synthetic dyed and undyed fibres 6,2-11,5.

 

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