JPS5817292B2 - Texture - Dokakoushio - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has high working speed and stability in one working step, continuous spinning-drawing-texturing step.
The present invention relates to a method for producing textured yarn or textured yarn that is highly suitable for textiles.

Apart from the usual methods of producing textured yarns by three individual working steps: spinning, draw-twisting or draw-winding and texturing, combined processes such as spinning-drawing-turn or drawing-texturing are also possible. is actually being done.

However, these bonding methods have the disadvantage that a winding step is always required between the spinning step and the texturing step.

Such winding operations have an undesirable effect on the uniformity of the yarn.

The up and down movement of the filament during winding creates a difference in the preorientation of the yarn on opposite sides of the thread guide.

Moreover, the centrifugal effects caused by the up-and-down movement of the filaments and also the diffusion effects in the wound body make it impossible to keep the thickness of the wound layer absolutely constant.

If high quality of the yarn is required, said surface differences in the yarn cause variations in the dyeability of the textured yarn and a decrease in tensile strength.

Further, variations occur in the thickness of the finished thread-wound body.

For example, when using the false twisting method or the stuffing method, the texture processing becomes difficult.

Other difficulties exist in processes where there is a winding process between spinning and texturing, such as storage problems.

A further non-negligible drawback is the possibility of mechanical damage to the thread during the transition from stage to stage.

Finally, it can be said that operation performed in separate stages is not economically satisfactory.

Attempts have therefore been made to find improved methods in which each of the above steps can be carried out completely sequentially.

Such spinning, drawing and texturing methods are described, for example, in German Patent Application No. 1902213.

According to the method described in the publication, the filament exiting the spinning machine passes through a cooling godet after solidification, is then stretched, and finally crimped and fixed in a subsequent manner.

Apart from the subsequent fixing operation, in this process the cooling godet must be positioned in each case at a suitable distance from the spinning nozzle, depending on, for example, the denier of the filament, the discharge speed, the throughput and the ambient temperature. It has the following disadvantages.

Therefore, when obtaining filaments of different deniers or when changing the diameter of the spinning nozzle hole, the position of the godet must be changed each time.

Also, since the cooling godet must be adjusted to a temperature just above the dew point, the conditions surrounding the godet must be very precisely controlled.

Locating the drawing point on the cooling godet is also difficult, which reduces yarn uniformity and leads to hair cracking.

Finally, such methods that produce more or less latent crimp, as in the case of bicomponent yarns, result in relatively weak crimp exhibiting a second order coefficient of the stress strain curve in the non-crimp zone. .

Another method of continuous spinning-texturing of synthetic yarns (UK Patent No. 1,170,749) uses a blowing air nozzle mounted below the spinning nozzle to elongate the yarn bundle.

In this method, the elongation is not uniform and complete, as evidenced by the high break elongation of at least 61% (and is not suitable for producing high quality textured yarns).

Furthermore, another spinning-drawing-texturing method (French Painting Patent No. 1,535,468) uses a stuffing method or a false twisting method in the texturing step, which is uneconomical and low cost. Limited to fast methods.

Finally, the air blowing method that enables continuous spinning, drawing, and texturing of lead acid fiber yarn or nylon yarn was awarded French Painting Patent No. 1555112.
However, the disadvantage of this method is that two separate nozzle systems must be used;
Another problem is that the operating speed is limited to about 500 m/min due to the shape of the nozzle.

The object of the present invention is to develop a continuous spinning-drawing-texturing method that has a significantly higher working speed than known methods, is stable, and can yield textured yarns that are highly suitable for textiles. The object of the present invention is to provide and at the same time eliminate the disadvantages of conventional methods.

This object, according to the invention, consists in a continuous spinning-drawing-texturing process of synthetic high-molecular-weight fiber-forming polymers selected from the group consisting of poly-ε-caprolactam and polyhexamethylene adipamide. (a) The high molecular weight polymer is heated to a temperature of 260 to 295°C.
, Melt spinning to form a filament group at a nozzle exit speed of the melt: spun filament winding speed of 1:10 to 1:60, (b) uniform tensile strength and In order to provide the elastic modulus, the filament group is heated to at least two stages of godet pairs (each stage godet pair except the final stage godet pair has a surface temperature of 50 to 120°C, and the final stage godet pair has a surface temperature of 80 to 350°C). by the drawing ratio such that after the drawing step the drawn filament group has a breaking elongation of 10 to 50% and the degree of drawing of the first stage godet pair is higher than the total drawing degree of the other godet pairs. (C) Then, the yarn leaving the drawing stage at a temperature of 50 to 180° C. at a speed of 800 to 3000 m/min is textured by an air jet method with an overfeed of 10 to 50%. , the denier of the individual filaments is 3
~30dtex, denier of all filament groups is 10
This can be achieved by setting the distance between 0 and 3600 dtex.

The method is applied to synthetic fiber-forming polymers selected from the group consisting of poly-ε-caprolactam and poly-hexamethylene adipamide, which polyamides have been modified by the addition of additives or comonomers. Good too.

The method of the present invention is based on the relative viscosity (96.0% sulfuric acid solution 100ml
A solution of 1 g of poly-ε-caprolactam dissolved in 2
(measured at 5°C) is 2.3 to 35, especially 2.4 to 32
It is particularly suitable when using poly-ε-caprolactam.

The polymer is first heated at 260-295°C, especially at 275-295°C.
Melt-spun at a temperature of 85°C.

In this case, the nozzle exit speed of the melt: the winding-up speed of the spun filament is 1=10 and 1:60, in particular 1:20 to 1:
It is necessary to strictly adhere to the spinning conditions of 40.

In this case, the final denier of the textured yarn is 1
00 to 3600, especially 800 to 1600 dte
It is advantageous to spin the yarn so that the final denier of the individual filaments is between 3 and 30 dte.
x.

Furthermore, it has been found that filaments whose individual cross-sections are usually circular or nearly circular and have a large number of recesses, especially three recesses, are suitable.

The shrinkage of the yarn in boiling water that passes through the melt spinning stage and enters the drawing stage is -10 to +10%, especially -5 to ±5.
% is desirable.

Therefore, it is preferable to adjust the conditions for melt spinning so as to obtain the boiling water shrinkage values as described above, depending on the material used each time, but such adjustment is not essential.

Melt spinning is immediately followed by drawing.

In this case, the filaments are cooled to such an extent that the individual filaments do not stick to each other.

The stretching is carried out in at least two stages, preferably two or three stages, each using a godet and a pair of godets.

It is necessary that the degree of stretching in the first stretching stage is greater than the total stretching degree in the other stages.

If the filaments are drawn in two stages, it is preferred to draw the filaments in the first stage to an amount equal to % to 9 of the total draw ratio.

The draw ratio is adjusted by controlling the speed of the corresponding draw member or godet pair.

It is important to maintain an appropriate temperature in the godets.

If the stretching is in two stages, the surface temperature of the first stage godet pair, or if the stretching is in two or more stages, the surface temperature of all godet pairs except the final stage godet pair is 50 to 1.
It is necessary to maintain the temperature at 20°C, and the surface temperature of the final godet pair as a stretched member is 80 to 350°C.
In particular, it is necessary to maintain the temperature between 140 and 180°C.

Furthermore, the cutting elongation of the drawn filament is 10 to 5.
It is necessary to adjust the stretching ratio so that it is 0%, especially 20 to 35%.

Texturing is carried out immediately after stretching, in this case 8
Due to the high speeds of 00 to 3000771/min, only methods that can be carried out at speeds of at least 800 m/min are of interest.

Therefore, German Patent Application No. 2006
An air injection method (see Examples) as disclosed in Japanese Patent Publication No. 022 (Japanese Patent Publication No. 53-28540) is suitable.

In principle, by combining the three steps namely spinning, drawing and texturing into one continuous working process, the dyeing uniformity and elastic modulus or tensile strength and elongation can be improved in the resulting textured yarn. The uniformity is clearly improved.

According to the method of the invention, the strength loss caused by conventional texturing is significantly reduced.

The nylon 6 yarn obtained by drawing (or stretching) immediately after spinning is a yarn with a hexagonal structure, that is, a γ-structure, and is rolled up or stretched for a certain period of time between spinning and drawing. When the yarn is drawn, it becomes a yarn having a monoclinic structure, that is, an α-structure.

Yarn obtained by continuous spinning and drawing has poor orientation and a lower degree of crystallization (and is therefore more stable) than yarn obtained by providing a certain residence time between spinning and drawing. Not good at sex.

That is, a yarn with a hexagonal structure (γ-structure) is inferior to a yarn with a monoclinic structure (α-structure) in its stability and, therefore, is inferior in textile suitability.

The textured yarn obtained by further spinning, winding, drawing, and texture processing starts from an α-structure (after drawing), and the textured yarn also has α
One structure is expected, and in fact the analysis of the yarn also shows an alpha one structure.

On the other hand, the yarn obtained by continuously spinning and drawing has a γ-structure, and those skilled in the art would expect that a combination of the direct continuous spinning and drawing method and texturing would exhibit a γ-structure, In fact, such yarns have been shown to have a γ-structure.

Based on the above facts, it is expected that the nylon 6 yarn obtained by direct continuous spinning, drawing, and texturing process has a γ-structure, and therefore, the property exhibited by the γ-structure, that is, the yarn with an α-structure It is naturally expected by those skilled in the art that it will be less stable, have a lower density, and have poorer weaving suitability.

However, surprisingly, the method of the present invention, i.e., spinning under specific conditions as shown in the claims.
Although the yarn obtained by the direct continuous drawing-texturing method has a γ-structure, it is surprisingly similar to a yarn with an α-structure, that is, it is a stable fabric with excellent dyeing uniformity. It was an excellent fit.

The method of the invention avoids damage to the winding body due to uncontrollable storage that occurs in conventional discontinuous processes, in particular undesirable factors due to irregular winding, i.e. the occurrence of differences in pre-orientation and Fluctuations in water and finish content are eliminated.

Thus, according to the method of the invention, the occurrence of yarn breakage can be reduced to practically zero.

In the present invention, it is necessary to maintain the spinning temperature within the limits as described above, and since the viscosity and pressure of the melt become higher at temperatures lower than the auxiliary yarn temperature within the limits, At temperatures above this limit, leakage may occur, while at temperatures above this limit, decomposed polymer may be deposited on the nozzle rim, leading to unfavorable spinning results.

The method of the invention is carried out in such a way that the temperature gradients in the individual cross-sections of the filament bundles leaving the first drawing godet pair are as small as possible.

In such cases, temperature gradient means the temperature difference between the center of the filament cross-section and the outer surface.

This is accomplished by feeding the filament bundle into the filament guide against the flow of the first stage godet at a temperature below which surface adhesion of the filament bundle still exists.

Furthermore, the godet pairs in the drawing stage are designed as heated roll pairs, such means eliminating temperature gradients such as would occur when using one heated roll and one unheated idle roll.

The accompanying drawings show typical thread flow paths in the method of the present invention.

The filament bundle 2 discharged from the spinning nozzle 1 includes a cutter 3, a filament guide 4, preparation rolls 5, 6, and γ.
The filament is guided along the filament guide 8 and reaches the first godet pair 9,10.

The yarn is wound around this godet pair, then the second godet pair 11, 12, and then the third godet pair 1.
3 and 14, respectively.

The yarn is then introduced into a texturing device 15 and the air blast textured yarn is then crimped and loosely wound onto a rotating cooling drum 16.

From the drum 16 the yarn is moved via a control bar 18 and a guide roll 19 by a feed roll 20 having an idle roll 21 on which the yarn is wound.

In the vicinity of the control bar 18 there is a movable yarn monitoring member 17 which activates the cutter 3 during cutting of the yarn.

For example, when manufacturing carpet yarn, the jet marking device 22 can be installed in front of the feed roll 200.

A spool oil or lubricant can be applied at this point.

Finally, the yarn passes through the flying roll 23 and the guide roll 24 of the tension-controlled winding and reaches onto the thread roll 25.

The detection roll 26 serves for coarse adjustment of the rotational speed of the winding roll 250.

The following example illustrates the advantages of the method of the invention compared to known methods.

Example A melt of a polyamide 6-polymer having a TiO2 content of 0.2% and a relative viscosity of η-2.78 (measured in 96% sulfuric acid) was passed through a nozzle at a temperature of 285° C. and a speed of 600 m/min. Exit speed: Spun filament winding speed 1:32 to form a yarn consisting of a bundle of filaments with a denier of 3800 dtex f68, and the yarn is subsequently drawn by three stages of godet lamps.

The temperature of the first stage godet pair is 92°C, the temperature of the second stage godet pair is 98°C, and the temperature of the third stage godet pair is 185°C.

The stretching ratio between the first pair of godets and the second pair of godets is 1.
:2.6, and the draw ratio between the second stage godet pair and the third stage godet pair is 1:1.33, so the total stretch ratio is 1:3.45.

The speed of the yarn exiting the last pair of godets is 2050 m/
It's a minute.

Texture processing followed by stretching
This is carried out in an apparatus such as that described in Publication No. 40.

That is, the drawn yarn is introduced into a texturing device using air injection at a speed of 800 m/min, and air at 390° C.
A pressure of 58 atmospheres is supplied to the apparatus at a rate of 0.297 rVhr.

Although the yarn textured by high-pressure air injection shows a γ-structure, it has excellent crimpability, and yarns with the following characteristic values are obtained: (1) Measurement of crimp shrinkage is This is done by measuring the length of fully wetted yarn samples under two different loads.

The difference in length from the length measured at the initial stage of elongation of the sample represents the crimp contraction (K, K).

The crimped bulky yarn in the shape of a wind is therefore placed in water at room temperature for 10 minutes without applying any tension.

After taking it out of the water, the yarn strips are first 0.045? /
dtex and then a weight of 0.009 S'/dtex, and the length Ll or L2 was measured.

(2) The color density of the knitted tube was measured using a photoelectric reflectance photometer (Zeiss AG Ellefo, Oberkotschen, Federal Republic of Germany).

From the reflection value R read out by the device, a value is calculated using a Kubelka-Munk function, in which the /S value of the sample is expressed in % with respect to the /S value of the comparison standard.

Comparative Example 1 As already mentioned above, the yarn spun from the melt was wound onto a bobbin in the conventional manner and then subjected to two separate steps, namely drawing and texturing.

That is, the first stage godet at 80°C and the second stage godet at 105°C.
processed by a step godet at a drawing ratio of 1:3.5 and a drawing speed of the yarn exiting the second step godet of 800,771/min;
This was then heated to 5.19 m at 280°C for low speed.
The yarn obtained by texture processing by the air injection method with an air amount of ) Tensile strength 2 The yarn according to the invention is superior to that of the conventional method, with a small deviation from the average value, and therefore the yarn according to the invention has an excellent tensile strength despite its γ-structure.

(2) Cutting elongation: Although there is not much difference in the cutting elongation itself, the deviation is small and the yarn according to the present invention is excellent.

(3) Crimp shrinkage: Although the value of the yarn of the present invention is somewhat low,
There are few deviations and therefore the dyeing uniformity is excellent.

(4) Dyeability: The yarn of the present invention is excellent in both dyeability and its deviation.

As shown above, although the yarn according to the present invention has a γ-structure, it is superior to a yarn having an α-structure in its physical properties, dyeability, etc.

Comparative Example 2 In the present invention, the processing conditions of each stage of spinning, drawing, and texturing are the same as those of known methods, but the conditions of each stage shown in the patent claims are combined. Even though it has a γ-structure due to the direct continuous method, it exhibits physical properties similar to a yarn exhibiting an α-structure, and has stable suitability for textiles.

In order to specifically demonstrate this fact, a comparison of the physical properties of the yarn (A) obtained by a combination other than the conditions of each stage according to the present invention and the yarn (B) according to the present invention is shown below.

In the above table, in A, the cutting elongation of the drawn yarn is 50
Above, the melt temperature is 295°C or higher.

A, that is, the yarn produced under conditions outside the claimed scope of the method of the present invention was inferior in its tensile strength and elastic modulus.

[Brief explanation of the drawing]

The accompanying drawings are schematic diagrams showing the process of continuous spinning, drawing, and texturing according to the method of the present invention. The correspondence relationship between the main parts shown and the symbols is as follows. 1°゛°°°°spinning nozzle, 2... filament bundle, 3... cutter, 4, 8...°... filament guide, 5, 6, 7... ... Preparation roll, 9, 10 · ° ° ... First stage godet pair, 11, 12
...Second stage godet pair, 13.14°°゛...
°Third stage godet pair, 15...texturing device, 16...rotating cooling drum, 17...
--- Movable yarn monitoring member, 18 --- Brake bar, 19 --- Guide roll, 20 --- Feed roll, 21 --- Idle roll, 23・・・
... Flying roll, 24 ... Guide roll, 2
5...Pinning roll, 26...Detection roll.

Claims (1)

[Claims] 1. In a continuous spinning-drawing-texturing method of a synthetic polymer for fiber formation selected from the group consisting of poly-ε-caprolactam and polyhexamethylene adipamide, (a ) The above polymer was heated to a temperature of 260 to 295°C.
, Melt spinning to form a filament group at a nozzle exit speed of the melt: spun filament winding speed of 1:10 to 1:60, (b) uniform tensile strength and In order to provide the elastic modulus, the filament group is heated to at least two stages of godet pairs (each stage godet pair except the final stage godet pair has a surface temperature of 50 to 120°C, and the final stage godet pair has a surface temperature of 80 to 350°C). after the drawing step, the group of drawn filaments is 1
(c) Stretching by a stretching ratio having a cutting elongation of 0 to 50% and such that the stretching dust of the first stage godet pair is greater than the total stretching dust of the godet pair;
The temperature at which it exits the drawing stage at a speed of 3000 m/min to 50 m/min.
Yarns at 180°C to 180°C are textured by air blasting with 10% to 50% overfeed, individual filament denier 3 to 30 dtex,
Denier of all fixtures ranges from 100 to 3600 d
Continuous spinning of synthetic polymer for fiber formation characterized by
Stretching-texturing method.