The way besperemenno spinning

 

(57) Abstract:

The method is designed to produce yarn for various purposes of cellulosic fibres and their blends with synthetic fibers and can improve the spinning properties of the fibers throughout the cross section of the tape. This was before and after the humidification process of the fibers in an inhomogeneous magnetic field. The first processing is made directly to moisture for 6 to 11, and the second one 9 - 11 when wet for 7 to 9 C. When the magnetic field increases from 0 to 350 kA/m, and its change per unit length support equal 17500 kA/m2. 2 C.p. f-crystals, 1 table.

The invention relates to spinning textile industry and can be used to produce yarn for various purposes of cellulosic fibres and their blends with synthetic fibers.

The known method besperemenno spinning, which consists in applying to the spinning device and the compaction of the fibrous tape, the separation of the fibers, transportation and renting them in the area of sampling the transportation of the fibers by the air flow in the rotor and seal their team on the surface of the rotor education is 2).

The disadvantage of this method is the reduced moisture content of the fibers at the time of admission to a zone sampling and, consequently, reduced predomi properties of the fibers. Intense teeth discretizing drum on the fiber, especially on the longest of them, which at the moment of impact of the teeth in the input device, accompanied by the rupture of fibres and damage them. The fibers are cracked, split microfibril, there are changes in their geometry and other damage to the fibers responsible for the reduced degree of supramania them into yarn, the growth of nerovnosti and hairiness of the yarn, as well as a reduction in its strength.

Closest to the proposed method is a method besperemenno spinning, which consists in applying a fibrous product, moisturizing, sealing, sampling fibers, thickening and subsequent twisting them into yarn (3).

The disadvantage of this method is that in accordance with the supplied moisture passes through several layers of tape in the pelvis. The parameters of the moving agent, such as temperature and moisture content, while passing through the layers of tape change significantly, and this leads to a different degree moistened EMA (30) moves in the atmosphere of the shop and the surface moisture content of the fibers is greatly reduced. Nedoplachennie fibers are characterized by low flexibility, strength, electrical conductivity and friction properties. In the end, these fibers are subjected to destruction and damage in the area of sampling - they are more rigid, more electrified in the areas of transportation, worse supracaudal in the formation zone of the yarn - they have a lower coefficient of tangential shear and increased stiffness. In the end, it turns out the yarn more heterogeneous, fluffy and loose in its structure and, consequently, less durable, with a high prevalence of nerovnosti.

Object of the invention is the improvement of the method besperemenno spinning to obtain a technical result consists in increasing predomi properties of fibers throughout the cross section of the tape.

This technical result in the way besperemenno spinning, which consists in applying a fibrous product, moisturizing, sealing, sampling fibers, thickening and subsequent twisting of the yarn is achieved by the fact that before and after the operation of the humidification process of the fibers in an inhomogeneous magnetic field, while the first processing is made directly to moisture, and the second after 6 - 11 C.

The magnetic field increases from 0 to 350 kA/m, and the intensity of the magnetic field per unit length support equal 17500 kA/m2.

The effect of inhomogeneous magnetic field on the fiber before processing their ferry is necessary, mainly to enhance processes of hydration and more homogeneous composition of the fibers in the ribbon on their moisture content. After processing the fibers ferry exposed to an inhomogeneous magnetic field required to change the energy state of the structural elements and defects, which improves the strength of the fibers.

Effect of magnetic field on the change of properties of the fibers can be explained by many factors: the change in energy state of the radical end groups, ions, nuclei of atoms; the emergence of Lorentz forces and forces acting on the loop current in an inhomogeneous magnetic field; activation of chemical reactions, the occurrence of which is caused or enhanced by the presence of water molecules.

The effectiveness of the magnetic field in the presence of water because the water molecules penetrate into the fibers, contribute to the rupture of relations, especially intermolecular, nabri dramatically changed.

The technical result consists in increasing predomi properties of fibers throughout the cross section of the ribbon, is also achieved for the following reasons. Resulting in a magnetic field the Lorentz force (Fl) can be found by the formula

< / BR>
where

q - the value of the charge, V is the velocity of the ordered motion of the charge, B is the magnetic field induction.

In our case V 10-3m/s B = 0,4 T, and q will take the maximum value of the electron charge, i.e. 1,610-19CL. Then Fl= 1,610-1910-30,4 = 10-22H. Such a force will have more gravitational force to mass, which can be found as: mg = Fl(g - acceleration of free fall).

m = Fl/g = 10-22/9,8 10-23kg

Given that the mass of one nucleon is equal to about 10-27kg, you can see the superiority of the Lorentz force over the gravitational force for frequencies containing up to 104nucleons. The force acting on the molecular currents in inhomogeneous magnetic field can be found by the formula

< / BR>
where

Pmis the magnetic moment of the structural formation in the fiber;

0- constant;

H/X is the intensity of the magnetic field in the direction of the fibers;

- the angle between the vectors

the force Fl. Interval 9-11 with the first treatment in a magnetic field take on the principle of sufficiency. To activate the hydrophilic fibers of cotton adequate exposure for 9, and a mixture of cotton fibers with hydrophobic fibers, such as Dacron, the necessary shutter 11 C. experimentally found that if the residence time in the magnetic field will be less than 9, it is not achieved the desired effect activation of the fibers, and if more than 11, it is no increased effect. The period of time in 9-11 with after steaming, the secondary processing tape in a magnetic field serves to cool the fibers. Cooling them is necessary in order to reduce the energy of thermal vibrations of the structural elements of the fibers and thereby increase the efficiency of the magnetic field. At low linear density of the tape, for example 2 ktex, the time of cooling after steaming taken equal to 6, and if the linear density of the tape is equal to 6 ktex, it's time you take is equal to 11 C. We experimentally found that when cooled after steaming less than 6 with the tape does not have time to cool to ambient temperature. If this time exceeds 11, the reduced moisture content of the fibers. Second stay l is Anenii with primary exposure due to the higher moisture content of the tape after steaming and, in this regard, the efficiency of the magnetic field. The lower end of the range, 7 to take for cotton, and the top - 9 to a mixture of fibres of cotton of synthetic, for example, polyester.

Examples of practical implementation of the method.

Used the sliver after the second tape of the transition linear density of 3.57 ktex. The tape took two variants: made from 100% cotton and also made of 75% cotton and 25% polyester. Yarn produced on pneumopathies machine MRP - AM at a speed of raschetyvaya drums 8500 rpm and the rotational speed of the impellers 60000 rpm Magnetic field was obtained using sintered permanent magnets made of an alloy based on Nd-Fe-b Magnetic system and ceramic transfer capacitance for steaming were located in the area between the pelvis with ribbon and entry into pnevmochamber. Data about the changing characteristics of fibers and parameters obtained yarn on the proposed method in comparison with the industrial method and the prototype shown in the table. As can be seen from the table, the proposed method allows to obtain more uniform wetting of the fibers in the cross section of the tape. The moisture content of the fibers in the ribbon, under options 1 and 2 (see table). was 5.5% for the variant is obtained by the proposed method and the influence of magnetic fields allow you to get the fiber in comparison with the prototype stronger by 9%, less hard - module longitudinal strain below 30% and a low of 18% of the value of the specific surface resistance (see table). The higher strength fibers on the proposed method allows to reduce defects and destruction in the area of sampling. Increased flexibility leads to the reduction of the moment of resistance predaniju fibers in the yarn, i.e. the reduction of the torque caused by the elasticity of the fiber. The high flexibility of the fibers and friction properties (see table). allows you to better Orient them along the axis of the ribbon and to provide a more intensive interaction with each other. The low value of electrical resistivity contributes to reducing the electrostatic fibers, and thus reduce their pusenja.

The above changes in the properties of the fibers can significantly improve the yarn quality characteristics in comparison with the prototype (options 3 and 4 in the table): increase the yarn strength by 10%, and the quality score of 7.5%; decrease of proveta 5%, the indicators hairiness of 1 to 30%, the cross-sectional area by 15%.

1. The way besmertnova spinning, which consists in applying a fibrous product, moisturizing, sealing, sampling in syshestvyut processing of fibers in an inhomogeneous magnetic field, the first processing is made directly to moisture, and the second after 6 - 11 C.

2. The method according to p. 1, characterized in that the processing in an inhomogeneous magnetic field produced before moisturizer, carried out for 9 - 11, and the processing after moistening - for 7 to 9 C.

3. The method according to p. 1, characterized in that the magnetic field increases from 0 to 350 kA/m, and the intensity of the magnetic field per unit length support equal 17500 kA/m2.

 

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