CS227826B1 - Treatment of the sewing thread from endless polyester fibres - Google Patents

Description

The invention relates to a method of treating a continuous thread of PES fibers, the production of which comprises the process of winding, flowing, first fixing, twisting, drawing, second fixing, coning, dyeing and rewinding. PES sewing threads made of high strength polyester have high strength, low ductility and low shrinkage. These properties are among the top threads produced by us, but because of their stiffness and liveliness when sewing, they cannot be applied to all sewing machines.

Especially at higher sewing speeds, these threads are prewound in the shuttle. The upper threads fall off the wraps due to the considerable smoothness and they also overlap through the stitches of the sewing machine. With the use of trimming machines, the threads are ejected from the needle. Stronger species are due to their stiffness and poorly colored.

There are known threads made from PES staple fibers. These threads fully meet all the requirements for sewing threads, such as slackness, strength, ductility, good colorability, and good absorbency and drainage properties of the fabric conditioner. The thread has as little contact area as possible with the needle;

- However, the production of staple fiber is more laborious and more expensive. Furthermore, the PES staple yarns show a lot of ears and uneven spots, which cause frequent breaks during further processing.

The object of achieving all the prescribed properties of a sewing thread made of continuous PES fibers is to provide a method for treating the yarn according to the invention, wherein the sewing thread is subjected to a compressed air temperature of 20 to 25 ° between the first fixation and the second twist. C and a pressure of 0.539 to 0.588 MPa.

The advantage of this PES endless silk sewing thread is that the character and feel of the staple yarn is formed on the surface.

The threads thus treated then have a finely haired surface, which is particularly advantageous in obtaining as little contact area as possible with the sewing needle.

Example

When the 140 dtex x 2 PES-shaped sewing thread is treated, the first winding operation occurs. Yarn 140 dtex 36 f Slotera UP PM shifters from rolls to large cylindrical reels with edge discs at a speed of 550 m / min and tension on individual yarns 20 p / yarn.

This operation is followed by an inflow of not more than 550 twists / m, the twist direction Z at 8,000 rpm, the feed rate is 14 rpm, and for single threads, 15-20 p / thread.

The first fixation follows - fixation. Fixing takes place with saturated steam at 110 ° C for 20 minutes. Fixing is carried out on reels stored in crates. The crates are placed on a trolley with which they are inserted into the boiler. After stabilization, the trolley is removed from the boiler.

After fixing, the sewing thread is subjected to an operation according to the invention, i.e. air-shaped. The shaping is carried out with a Mirion II adapter, with a thread tension upstream of the adapter 10 p / nit and downstream of the adapter 25 p / nit, at a speed of 300 m / min. Operating air pressure 0.539 to 0.588 MPa, forming intensity 15%, winding distance on reel max. 110 mm. The compressed air must be dry, clean, free of oil and dirt, at a temperature of 20 to 25 ° C. This operation creates the non-thread character of the staple thread.

Operation II follows. twisting at 6,000 rpm, at a feed speed of 12 m / min. The tension on the individual threads is about 30 to 40 p / thread. Number of twists 600 - S direction and loop = 0 - no self-forming loops. The thread can also be subjected to multiple twisting (2x, 3x, 4x etc.

Then the sewing thread is subjected to a drawing which is carried out at a winding speed of 800 m / min on the drawing machines at a tension per single thread of 55 p / thread. The yarns are wound on a metal drum for subsequent fixation of 0 220 mm, a distance of 210 mm and a winding of the yarn of the drum in a thickness of 10 mm.

This is followed by a fixation, where the material is transported to the trolley in front of the fixture. After heating to about 60 ° C, the material is placed manually in the housing on the drums. This is heated to a non-prescribed temperature of 190 ° C and since then the time of 90 minutes has been measured. After cooling, the material is removed from the cabinet. In this operation, the internal tension and yarn erosion is adjusted.

Thereafter, the yarn is rewound either to prepare for blushing and dyeing, or for twisting for sale.

The newly modified PES sewing threads are soft, sticky and easy to clean. Usability not even for high speeds up to 9000 rpm can be used, for example, shuttle yoke, needle flow or even at the same time. Their application is practically unlimited. Their rough surface has the character of staple fibers, but their mechanical and physical properties meet the standard for smooth PES threads.

The input and output values of the yarns are as follows:

Input values of 140 dtex PESh VP from Senice - gray, raw material.

Strength ductility elongation in boiling

6.5 N

8.6%

».

Output values 140 dtex x2 Suprex - after staining

Strength 14.5 N Ductility 12.0% Boostability 0.13%.

Claims (1)

SUBJECT OF THE INVENTION A method for treating a sewing thread of continuous PES fibers, the manufacture of which comprises the process of winding the twisting, first fixing, second twisting, drawing, second fixing, coning, dyeing and transferring, characterized in that the sewing thread is subjected to compression air at a temperature of 20 to 25 ° C and a pressure of 0.539 to 0.588 MPa.