SU1344828A1 - Method of producing yarn - Google Patents

Description

The invention relates to textile production, in particular to methods for producing yarn.

The purpose of the invention is to improve the quality of life.

1 schematically shows a device for implementing the method; figure 2 - ready przh.

For the implementation of the method, a ribbon 1 consisting of fibers of the final length, coming out of the supplying pair 2 of the exhaust device 3 is used. the fiber material 5 of the yarn is given a false twist by the swirling movement of the gaseous agent entering the false twist device 6, and then pneumatically intercepted by turbulent gaseous flows directed at an angle to ION movement device 7 pnevmopereputyvani. When this occurs, the process of entangling the fibers of the final length between themselves or with the elementary fibers of the complex

the clamped state (twisted by a false 1 twist), their front ends, making oscillatory movements, are entangled with adjacent fibers.

Thus, in the section AB, fibers of a finite length periodically appear in a free state, when the connections between them are made 10 s only by applying a false twist to their ends located in the section BO. Moreover, if the length of these fibers is shorter than the distance AB, then real conditions are created for the extraction of these fibers into waste, and, therefore, disruption of the process of forming high-quality yarn. To prevent this, it is necessary that the distance from the point of communication

20, the fiber material of the false twist before the start of the operation of its pneumatic entanglement was no more than the average final length of the fibers being processed. One of the most important conditions for the formation of yarn by compressed air is the absence of forced tension of the fibrous material in the processing devices for yarn production. In the case of tachymic threads. The resultant tension of the formation of a detachment pair 9 is fed to the organ is disturbed. Therefore, the feed rate

the fibrous material must be greater than or equal to the speed of its withdrawal from the device.

An experimental study of the process of forming a yarn using compressed air has shown that it falls on the body 10 of the nam shan to package 11.

The process of forming yarn is as follows.

After leaving the feed pair 2, the fibrous material gets a twist

35

in one direction, and, pass some point A, located between the devices 6 false.krutki and 7

honestly the yarn also affects the magnitude of the false twist and its linear rat-pneumatic entanglement, begins unwinding, i.e. for each linear density in the opposite direction. Yarns of yarn T exist such a false K twist, at which yarn quality is the best.

The red ends of the spinning fibers are entangled by the turbulent flows of the gaseous agent entering the device 7, and their rear ends are in the false twist zone.

The process of forming a yarn with a gaseous agent occurs simultaneously in two successive sections along the length of the yarn. In the first section, from the supply pair 2 to point A, a kind of pinching of the fibrous material takes place with the help of a false twist. In the second section of the aircraft, there is an intense gg of pressure in the processing processing of fibers of a finite length pulsating chamber, producing pneumatic interchange gaseous turbulent flows. Due to the fact that the rear

the knowledge. The pulsation of the pressure of the gas-capable agent leads to the fact that the structure of the yarn 8 obtained

the ends of these fibers are in a clamped state (twisted by a false twist), their front ends, having made oscillatory movements, are tangled with adjacent fibers.

Thus, in the section AB, the fibers of finite length periodically appear in a free state, when the connections between them are made only by applying a false twist to their ends located in the section BO. Moreover, if the length of these fibers is less than the distance AB, then real conditions are created for separating said fibers into waste, and, therefore, disturbing the process of forming high-quality yarn. To prevent this, it is necessary that the distance from the point of communication

The false twist fiber material before the start of the pneumatic entanglement operation was no more than the average final length of the fibers being processed. One of the most important conditions for the process of forming a yarn with compressed air is the absence of forced tension of the fibrous material in the processing devices for yarn production. In the case of the appearance of a yarn, the size of the false twist and its linear density, 40 i.e. for each linear yarn density T there is such a lie 45

50

on the twist K, at which the quality of the yarn is the best.

It was established that for worsted wool yarn with a linear density from 20 to 80 tex, this dependence has the form

., - 7617Т- 118.51 + O.VZT, K 469 ---- QO CRM

The process of entangling fibers of finite length with each other or with elements of complex chemical filaments is purely pulsating in nature, which is due to the presence of pulsation

the pressure values in the processing chamber making the pneumatic interchange-

the knowledge. The pulsation of the pressure of the gas-capable agent leads to the fact that the structure of the yarn 8 obtained

Significantly pronounced areas of compaction of fibrous material, which alternate with places of vacuum (Fig. 2).

Seals of fibrous material are formed when the pressure of the gaseous agent in the chamber 7 of the pneumatic entanglement increases, and the vacuum is lowered.

By increasing the length of the camera 7. entanglement the number of places where pulsation of turbulent gaseous-agent flows is observed is increasing. Consequently, fibers with different end points have different degrees of adhesion with each other depending on the duration of the entanglement operation. In particular, individual fibers with a small final length, with a decrease in the length of the pneumatic entanglement chamber 7, falling into the zone of reduced pressure, are released not densely, without contact with other fibers, which leads to their release into waste.

Therefore, to eliminate this drawback, it is necessary that the minimum length of the entanglement area be comparable to the minimum final length of the fibers involved in the process of entanglement. With a decrease in the minimum finite length of the fibers, the length of the region should increase.

The speed of movement of the fibrous

-t

The material in the entanglement chamber 7 also affects the degree of adhesion of the fibers to each other, which depends on the duration of the stay of the fibers in this chamber, i.e. with an increase in the speed of passage of the fibrous material, the time of its processing by turbulent flows should increase. Thus, the duration of the process of pneumosupplication is directly proportional to the length of the section of pneumosuction of yarn elements and the speed of their passage, and the length of the section

entanglement, in turn, is inversely proportional to the minimum final length of the fibrous material.

Example. The formation of semi-wool worsted yarn consisting of 50% wool and 50% polyester, average staple length 81 mm, minimum staple length 17 mm, linear density 62 tex. The speed of release of yarn is 0.5 m / s.

By the formula (1), it is found that for the normal process of forming the yarn of the above-mentioned density, it is necessary to impart to the fibrous material a false twist equal to 254 cu / m. Since the average staple length of the fibers involved in the formation of the yarn is 81 mm, the distance from the transition point of the false twist to the section of air entanglement should be no more than 81 mm. It is set to 40 mm, which at the same time makes it possible to use any fibers processed by the worsted wool spinning system. The duration of the pneumatic entanglement operation is established from the known ratio

L 1pc press 0.017 f „„. t - .0.034 s

where L is the length of the section of the pneumatic belt - I:

iUiUH pcs minimum fiber length

finite length; V - speed of release

Having determined the necessary parameters of the process of forming yarn, proceed to its manufacture. At the same time, its quality is characterized by the following indications: a relative breaking load of 14.35 gf / tex relative to breaking strength of 14%; coefficients of variation for breaking load and linear density, respectively, 9.5 and 1.5%.

9i.-p.2

Editor L. Veselovska Order 4891/29

Tehred M. Didyk

Co Pod

Circulation 413 BNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35 ,, Raushsk nab., d ,. 4/5

Production and printing company, Uzhgorod, st. Project, 4

Proofreader L. Patay Subscription

Claims (1)

METHOD OF PRODUCING YARN, in which the fibrous material is pulled, connected into a bundle by exposure to a gaseous agent, and on the second, the fibrous material is mixed up by directly impacting it with gaseous agent jets directed at an angle to the direction of movement of the fibrous material, characterized in that, in order to improve the quality of the yarn, the tangling of the fibers is carried out by a pulsating flow of a gaseous agent, the pulsation period being chosen directly proportional to the length of the fibrous material and vice versa by the agent simultaneously at two partly proportional speeds of its carriers, on the first of which the false material is told to twist by swirling gaseous movement, and the distance between the two sections does not exceed the average final length of the fibrous material. <Put.f 1344828 A1