JPS6215646B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a staple for spinning, and more specifically, the present invention relates to a method for producing a staple for spinning. The present invention relates to a method of manufacturing staples for spinning by cutting the staples.

Conventionally, the method for obtaining staples for spinning involves spinning and drawing, applying mechanical crimping, and then cutting.
A method of reapplying mechanical crimping to make staples;
A method of cutting undrawn yarn, semi-drawn yarn, or subtow or multifilament bundle of drawn yarn, or a method of obtaining staples by cutting yarn having so-called bimetallic properties that have been given different structural properties during spinning, etc. However, no matter which method you look at, the crimp required to increase the bulk of the spun yarn is either a two-dimensional crimp in a wavy form or a three-dimensional crimp in a coiled form. In the former case,
Since it is caused by heat fixation in a relaxed state, the shrinkage force is extremely weak.In the latter case, the difference in shrinkage force is used, so the mechanism of occurrence of shrinkage is due to the difference in shrinkage of the material. Like the former, the shrinkage force is extremely poor because it depends only on

Due to the above-mentioned drawbacks, it has been extremely difficult to obtain products that are bulky, have good elasticity, elasticity, resilience, and feel, which are required for clothing.

The present invention aims to solve these various drawbacks and provide a staple with stable quality and high efficiency that is bulky and has excellent functions in terms of firmness, elasticity, resilience, and quality and texture. Yes, published in 1977
This is an improved method of the method described in Publication No.-135340.

In order to achieve the above object, the present invention has the following configuration.

That is, the method is characterized in that a large number of multifilament yarns made of thermoplastic synthetic fibers are supplied in the form of a sheet, subjected to false twisting and shrinking, and then subjected to reheat treatment, and then supplied to a cutting zone for cutting. This is a method for producing staples for spinning.

To explain the present invention in more detail, the thermoplastic synthetic fiber is particularly preferably a polyethylene terephthalate multifilament yarn, which may be a drawn yarn, an undrawn yarn, or a semi-drawn yarn. Single yarn deniers may be of different deniers, or the total denier of one yarn may be composed of different deniers when looking at each of a plurality of yarns.

The main purpose of using different denier configurations is to improve crimp mix and crimp force mix, which is extremely meaningful for diversifying product characteristics.

When the sheet-like synthetic fiber multifilament yarn is twisted, heat-set and untwisted, if the yarn is a drawn yarn, it undergoes a so-called normal false twisting process.
On the other hand, for undrawn yarns and semi-drawn yarns, false twisting may be performed after the drawing step, or drawing and false twisting may be performed simultaneously.

Regarding false twisting equipment, even if it is a spindle type,
It may be of the friction type, or may utilize air flow, or any other type that allows for desired twisting.

In the present invention, after the false twisting process, each filament yarn in processed denier units is supplied in a separated state without convergence, without contacting each other, and with a constant width maintained in the subsequent reheat treatment process and twist cutting process. It is something to do.

If convergence occurs, uniform heat treatment cannot be achieved in the reheat treatment process, and on the other hand, miscuts, group cuts, etc. are promoted in the cutting process, resulting in an unavoidable non-uniform sliver.

The main purpose of the reheat treatment after false twisting is to convert the fine and strong three-dimensional crimped form imparted by the false twisting process, to make the crimped form latent, to alleviate the internal strain of the fiber, and to improve the fiber structure. The purpose of this treatment is to change the internal structure, and this treatment has a positive effect on various characteristics. The transformation of the crimped form is achieved by stretching the cut ends of the single fibers during the crimping process.
In other words, hook fibers due to rebound are drastically reduced,
Moreover, the sliver obtained by cutting is uniform, and drafting can be carried out smoothly.
This is due to the improved freedom of movement of the fibers due to the change in the crimp form, resulting in a significant improvement in the filament.

The range of transformation of the crimped form is preferably such that the fibers can be appropriately entangled with each other during cutting or as a sliver.

Furthermore, regarding the latentization of shrinkage, by temporarily making the strain imparted by the false twisting process latent, there is almost no change in the shape of the sliver over time, improving handling. It is useful for improving yarn lineage by improving rafting, bulking up spun yarn or fabric, giving elasticity, and heat retention. It provides elegance and improves the quality of the appearance.

Naturally, it also has the effect of relaxing the internal strain of the fibers, and the turning properties imparted by the false twisting and shrinking process are reduced.

The internal structure of the fiber changes subtly due to reheat treatment, for example, fibrillation of single fibers is noticeable, and the frosting caused by fibrillation, which is a drawback of synthetic fiber fabrics, is improved during reheat treatment. It is something that Furthermore, the number of hook fibers due to the stretch back of the cut ends of the fibers, which always occurs during cutting, is drastically reduced.

Next, to explain the process conditions, the false twisting process only needs to satisfy the conditions for obtaining a normal elastic yarn, but it may also be one that meets the required characteristics of knitted fabrics, such as the above-mentioned normal elastic yarn. The conditions may be more lenient than the yarn design.

Regarding the reheat treatment conditions, it is sufficient to satisfy the usual conditions for obtaining improved stretchable yarn, but in addition, the factors that are particularly important in determining the potential for shrinkage, swirlability, and internal structure of the fibers must be satisfied. It may be significantly different from the condition settings. For example, the temperature range from the second-order transition temperature of polyethylene terephthalate to the temperature at which the fibers melt can be applied. Under these conditions, the treatment is carried out under tension or relaxation as appropriate.

The reheat treatment step and the cutting step of the present invention may be performed subsequent to the false twisting and shrinking process, and after the false twisting and shrinking process, the process is performed by winding up the cheese etc. in another process. Of course it's good.

Next, the present invention will be explained with reference to the drawings. FIG. 1 is a process outline diagram showing one embodiment for carrying out the method of the present invention.

First, the thermoplastic synthetic fiber multifilament yarn 1 is fed to the feed roller 3 via the yarn separate guide 2, and subsequently the yarn 1 twisted by the false twisting device 5 is heated by the heating device 4. A yarn separate guide 10 is installed at the rear of the heating device 4. The yarn 1 that has passed through the false twisting device 5 is untwisted to complete the false twisting process. The yarn 1 that has passed through the first delivery roller 6 is subjected to reheat treatment between the second delivery rollers 8 under tension or relaxation. In addition, the heating body 7
It may be plate-shaped, tube-shaped, etc., and electric heat, steam, etc. can be used as the heating medium. The yarn 1 that has undergone the reheat treatment is sent to a second delivery roller 8 and a third delivery roller 9, where it is cut to become a staple for spinning.

As mentioned above, the false-twisting device 5 may be of any spindle type, friction type, or airflow type, etc. If we talk about turning ability, for example, the false-twisting spindles may be arranged alternately in S and Z, or all S.・Although all Z may be used, it is preferable to have S, Z, and alternate arrangement to balance the torque.

FIG. 2 shows the shrinkage characteristics (degree of shrinkage) of the spinning staple obtained according to the present invention immediately after cutting and after boiling water treatment under a load of 2 mg/d. Side-by-side composite fibers were inserted for comparison, and the strength of the present invention to develop shrinkage after heat treatment was significantly large.On the other hand, although the composite fibers had a large apparent shrinkage degree, heat treatment under load reduced the shrinkage. has decreased significantly. The reason why the staple obtained according to the present invention has a large crimp-inducing ability is because it is imparted with false twist crimp.

In the present invention, after simultaneous false twisting of multiple yarns, the desired denier bundle is arranged and wound into a beam or cheese, etc., reheated in a separate process, and then twisted after being wound into a beam or cheese, etc. Alternatively, the winding beam or cheese after the false twisting process may be continuously reheated and twisted in a separate process to become staples or roving for spinning. Needless to say, this is a good thing. Alternatively, the yarn that has been reheated may be directly placed in a spinning machine having a cutting function and immediately turned into a spun yarn. In these steps, the present invention may incorporate actual twisting or rubbing leather, a method using air force, etc. as a means for converging the staples after cutting.

Examples will be described below.

Example 1 500D made of polyethylene terephthalate
100 180f yarns were supplied and subjected to false twisting under the following processing conditions.

Number of spindles: 100 False twist number 1300T/M Heater temperature 210℃ Processing feed rate +3% The reheat treatment conditions are as follows.

Feed rate +5% Heater temperature 160℃ The cut-off conditions are as follows.

Ken-kiri magnification 2.50x Ken cutting gauge 60mm The situation before and after the Kenkiri is as follows.

Number of slivers when supplied 500D-80F 20 Torque ratio S:Z=1:1 Staple bundle after cutting 5 Number of (slivers) The sliver thus obtained is 1/2.25 (g/
m), and the sliver is of uniform quality, and the sliver is set in a normal ring spinning machine, Nm = 1/48 (Nm:
metric count) was spun. This thread was processed to double thread to create a 2/2 twill fabric, which had an elegant appearance, was rich in bulk, and had a texture with excellent firmness, elasticity, and resilience. As for the knitted fabric, a product of Motsuku Milano Rib was obtained, which was a wool-like knitted fabric with an elegant knitting surface and possessing the characteristics of the above-mentioned fabric. Almost no frosting was observed in the knitted fabric.

Example 2 A continuous filament bundle of 100 undrawn polyethylene terephthalate yarns having a single filament denier of 2 denier, 3 denier, and 5 denier in terms of drawing, and a total denier of 1000 D, was supplied. After stretching, false twisting was performed.

The stretching and false twisting processing conditions are as follows.

Stretching ratio: 3.42x Heat pin temperature 87℃ Number of spindles: 100 False twist number 1030T/M Processing temperature 205℃ Processing feed rate +2% The reheat treatment conditions are as follows.

Feed rate -1% Heater temperature 140℃ The cut-off conditions are as follows.

Ken-kiri magnification 5x Ken cutting gauge 70mm The situation before and after the Kenkiri is as follows.

Number of slivers when supplied 1000D-80f 20 Torque ratio S:Z=1:1 Staple bundle after cutting 5 Number of slivers (Sliver) The sliver thus obtained is 1/2.25 (g/
The sliver was of uniform quality of Nm = 1/48, and the sliver was set in a normal ring spinning machine and spun with Nm = 1/48. When this yarn was processed into double threads and used to make a pinewood fabric, it was possible to obtain a worsted-like fabric with excellent surface quality and excellent elasticity, elasticity, and resilience. Furthermore, the frosting of the fabric was also significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a process external view showing the manufacturing process of the present invention. FIG. 2 shows the shrinkage characteristics (degree of shrinkage) of the spinning staple obtained according to the present invention immediately after cutting and after boiling water treatment under a load of 2 mg/d. 1: Thermoplastic synthetic fiber multifilament yarn,
2: yarn separate guide, 3: feed roller, 4: heating device, 5: false twisting device, 6: first delivery roller, 7: heating body, 8: second delivery roller,
9: Third delivery roller, 10: Yarn separate guide.

Claims (1)

[Claims] 1. A large number of multifilament yarns made of thermoplastic synthetic fibers are supplied in the form of a sheet, subjected to false twisting and shrinking, and then each yarn is separated in its sheet form, subjected to reheat treatment, and then fed to the cutting zone. A method for producing a staple for spinning, characterized by cutting the staple.