JPH02259104A - High speed multi-end melt spinning method - Google Patents

Abstract

PURPOSE:To stably carry out high speed multi-end melt spinning for, enhancing productivity per position at usual spin pitch by compactly arranging a number of spinning hole groups in one spinneret to improve shake of yarn causing yarn breakage or adhesion between yarns. CONSTITUTION:When melt spinning is carried out using a spinneret 1 in which spinning hole 2 is divided and bored into three or more groups corresponding to spindle numbers of spinning yarn and spun yarn is cooled by a horizontal blowing device, the spinning hole groups 3 are arranged parallel to blowing face of cooling air 5 and spinning hole 2 is arranged in latticed form, perpendicularly crossing arrangement and <=8 line numbers and pitch between lines of the spinning hole 2 is arranged so as to become gradually larger as the pitch between line is kept apart from the blowing face and yarn is taken up in the formula P1<=P2<=6 (P1 is pitch between row of spinning hole and represents 6 in the Fig.; P2 is average value of pitch 7-11 between line and P1 and P2 are both single yarns mm) at 3-8Km/min spinning rate.

Description

Detailed Description of the Invention (Field of Application in Industry-1-) The present invention relates to a high-speed multi-spindle melt spinning method for polyester, polyamide, etc. More specifically, it relates to a high-speed multi-spindle melt spinning method in which one spinning I] gold is melt-spun using a spinneret with three or more groups of spinning holes corresponding to the number of spindles (number of ends). It is.

(Conventional technology) Generally in the manufacturing process of 2 synthetic fibers.

Measures to reduce manufacturing costs by reducing energy costs and labor costs can be broadly divided into two major trends: high-speed spinning and multi-spindle spinning. In particular, high-speed spinning was investigated relatively early on, and basic research on polyester, for example, has been completed, and currently 6-6
High-speed spinning at 8 km/min is on the verge of being industrialized. However, the development of the multi-spindle spinning method was delayed due to the technical changes described below, and if it were to be combined with high-speed spinning, more advanced spinning technology would be required. The current situation is that it has hardly been examined, and its development has been awaited.

The multi-spindle spinning method that has been published to date is a method that aims to produce multiple threads by arranging a large number of spindles within the spinning spin pitch. Industrially, conventional methods for producing multi-filament yarns by drilling holes have been limited to two spindles.

Here, the problems of the prior art multi-spindle spinning method performed using a plurality of spindles are as follows.

■ As the number of yarns increases, multiple extruders, spinnerets, cooling devices, etc. are required, which not only increases the equipment cost, but also increases the space occupied by these equipment and increases the energy consumption of utilities such as electricity. Growth is inevitable.

@ As the number of yarns increases, the diameter of the spinneret surface inevitably becomes smaller, and since the total discharge amount per position does not increase in proportion to the number of ends, the fineness of each yarn obtained becomes finer. Application is limited to the silk field.

On the other hand, when spinning multi-filament yarn by drilling multiple groups of spinnerets from one spinneret, the first technical issue required for the spinneret is to avoid increasing the size of the spinneret as much as possible. It is necessary that the groups of spinning holes drilled inside are arranged as densely as possible. However, in this case, yarn wobbling during the spinning process that occurs during the cooling and winding process of the multi-filament yarn spun from the spinneret, poor adhesion between the yarns, yarn unevenness, and single yarn breakage. 1. Considering the occurrence of fuzz, etc., there is a limit to increasing the density.

In addition, in the case of multi-filament spinning with three or more spindles per spinneret, the influence of accompanying airflow is unavoidable, and due to the difference in spinning tension between each thread due to thread division, stable spinning cannot be achieved. It becomes extremely difficult to do so. Furthermore, the higher the spinning speed, the higher the spinning speed.

In addition, the finer the single yarn fineness, the more these problems will be exacerbated, and the more difficult it will be to solve the problem.

(Problems to be Solved by the Invention) The present invention provides a spinning method in which three or more groups of spinning holes corresponding to the number of spindles are arranged in one spinneret [high-speed multi-spindle melt spinning using 1-metal gold]. In the spinning method.

We have developed a high-speed multi-spindle spinning melting method that can be spun at high speed and stably, making it possible to produce synthetic fibers such as polyester fibers and polyamide fibers with extremely high efficiency (low cost, high productivity). This is what we are trying to provide.

(Means for Solving the Problems) The present inventors have determined that the spinneret structural parameters related to the arrangement method and arrangement density of the spinneret group drilled in the spinneret, the spinning process parameters represented by the spinning speed, and the spinneret. The present invention was arrived at as a result of detailed examination of the relationship between yarn wobbling of uncooled yarn immediately after spinning and yarn position.

That is, when yarn wobbling becomes severe, not only yarn unevenness (m degree and physical property unevenness) of the spun yarn inevitably occurs, but also fusion between yarns and yarn breakage occur.

Stable spinning and winding becomes impossible, but by analyzing the relationship between the above parameters and the yarn wobbling and yarn position immediately after spinning from the spinning hole, which are closely related to these stable spinning conditions, it is possible to This project succeeded in solving the problem.

Incidentally, the yarn sway analysis was performed according to the first-order procedure. That is, a plane laser beam is irradiated onto the thread running on the spinning line, causing the filaments to shine in dots, and the bright spots are recorded on videotape. and.

While playing back the recorded tape, an electronic circuit detects the coordinates of a bright spot on the screen, inputs it into a microcomputer, and performs coordinate conversion and vibration analysis calculations.

This is a method of displaying or printing out the trajectory and vibration characteristics of the filament.

The gist of the present invention is as follows.

Melt spinning is performed using a spinneret in which spinning holes are divided into three or more groups corresponding to the number of spindles, and the spun yarn is cooled by a horizontal blowing device at a spinning speed of 3 to 8 km/m111.
A high-speed multi-spindle melt-spinning method characterized in that, in the multi-spindle melt-spinning process, the spinning holes are arranged parallel to the blowing surface, and the following conditions (a) to (C1) are simultaneously satisfied.

(a) The spinning holes are orthogonally arranged in a lattice-like G-column and the number of rows is 5 or 8 or less.

(bl) Gradually increase the pitch between the spinning holes as you move away from the spraying surface.

tc+ When the pitch between rows of spinning holes is p, (+im) + average pitch between rows is 1)2 (WIIll), P1≦
P2≦6.

Note that in the present invention, one column means a line parallel to the blowing direction, and one row means a line perpendicular to the blowing direction.

In order to facilitate understanding of the contents of the present invention, the present invention will be explained based on specific examples shown in two drawings (although the present invention is not limited to these).

FIG. 1 is an explanatory diagram showing one embodiment of the spinning L] gold in the present invention, where 1 is the spinning gold, 2 is the spinning hole, and 3 is one of the spinning holes drilled at the intersection of the matrix orthogonal array. , 4 indicates the gap between the spinning hole groups, and 5 indicates the cooling air supplied from the horizontal blowing and filling device and its direction.

In Fig. 1, 3 or 8 groups of spinning holes are arranged orthogonally arranged in 4 columns and 6 rows in the spinneret 1. After being cooled and solidified,
Each yarn group is bundled, and then the oil supply device and take-up I
: 1-1, etc., and then led to the same winder and wound up into 8 packages.

Next, FIGS. 2 to 4 are explanatory diagrams without showing two typical embodiments of the row and column intersection arrangement of the spinning holes in the present invention, 6 indicates the pitch P1 between the rows of spinning holes, and 7 to 4. Reference numeral 11 denotes the pitch between the spinning holes, which gradually increases as the distance from the spraying surface increases (average inter-row pitch P2). Each figure is an example of an array of orthogonal points arranged in 4 columns and 6 rows. Tatashi,
Figure 2 shows an example in which spinning holes 2 are drilled at all intersection points of orthogonal matrices, Figure 3 shows an example in which spinning holes 2 are drilled at every other intersection of the 2nd row and column -1-, and the 4th The figure shows an example in which spinning holes 2 are bored at every other intersection between the row and the launch. A case without perforation is also included within the scope of the present invention.

In addition, the number of spinning holes in a 1 vJ yarn hole group, which corresponds to the number of filaments constituting one yarn, is in the range of approximately 10 to 100, considering the current field of application, or the number of spinning holes in a row during perforation is approximately 10 to 100. In order to increase the difference in yarn sway between the wind side and the leeward side of the cooling air, the number of two lines needs to be 8 or less.

In general, with regard to the method of arranging the spinning holes of the spinning nozzle, increasing the pitch between rows and pitches between the columns of each spinning hole leads to an increase in the size of the spinning material, which is fundamentally undesirable.

The present inventors conducted a series of systematic experiments to find out to what extent it is possible to reduce the pitch between the spinning holes of these spun L-1 gold, and to what extent it is possible to increase the density of the spinning hole arrangement. Through extensive experiments, we carefully tested δ=t L. As a result, in the conventional type of nozzle (equal pitch array nozzle) in which holes are equally spaced from the windward to the leeward of the blowing surface, the pitch between the lines increases gradually from the windward side to the leeward side of the cooling air. However, the yarn one line before the leeward side exhibits the maximum yarn sway, and the spacing between the yarns or the wind is the same, and the distance between the yarns is dense on the leeward side, that is, on the leeward side, the wind --]2 It has been found that the spacing between the threads and the system is smaller than that on the side. In addition, as a result of long-term observation of yarn wobbling conditions, we found that when melt spinning is performed at high spinning speed using a high-density spinneret, the close contact between yarns and yarn breakage caused by increased yarn wobbling are reduced. We also found that it occurs concentratedly on the leeward side.

Based on this knowledge, the present invention prevents close contact between yarns and yarn breakage caused by yarn wobbling by gradually increasing the pitch between the rows of spinning holes as they move away from the spraying surface. It was successful in doing so.

As in the present invention, in multi-spindle spinning with three or more spindles, one
It is necessary that the inter-row pitch P1 and the average inter-row pitch P2 be 6 fins or less.

Further, occurrence of close contact due to yarn wobbling tends to occur more often in the row direction of the spinning holes, and it is necessary to satisfy P1≦P2.

Note that the present invention aims to provide a spinning method with high efficiency and high productivity, and the spinning speed is set at 3 to 8 km/min. When the spinning speed exceeds 3 km/min, in addition to yarn wobbling and adhesion, cohesive breakage (stress breakage) occurs frequently in the yarn, making stable spinning difficult.

(The spinning speed refers to the circumferential speed of the initial take-up roller.) Polymers to which the method of the present invention is applied include polyethylene terephthalate and polyesters containing this as a main component, nylon 6, nylon 66, and Examples include polyamide as a component.

(Example) The present invention will be explained in detail below using five examples.

Examples and Comparative Examples Polyethylene terephthalate with an average molecular weight of 122,000 was spun at a spinning temperature of 287°C, a cooling air temperature of a horizontal blowing device of 20°C, an average wind speed of 0.50 m/sec, and a spinning hole group number of 8. ．． Table 1 shows the results of melt spinning by changing the spinning hole arrangement under the common conditions that the pitch between the spinning hole groups was 15, the spinning speed was 7 km/min, and the single yarn fineness was 3 d.

In Table 1, Pa indicates the increment of line spacing from leeward to windward -1.

(Effects of the Invention) According to the present invention, it is possible to extremely combine a large number of spinning hole groups in one spinneret!・The spin pitch is lower than the conventional spin pitch.
Productivity per position is dramatically increased, and yarn can be stably produced at high speed.

Therefore, compared to conventional methods, significant labor and energy savings are achieved, and extremely highly efficient high-speed multi-spindle melt spinning becomes possible.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the spinneret according to the present invention, and FIGS. 2 to 4 are explanatory diagrams showing typical embodiments of the row-and-column intersection arrangement of the spinning holes in the spinneret. It is. 1: spinneret, 2: spinning hole, 3: spinning hole group. 4: pitch between groups of spinning holes, 5: cooling air. 6: Pitch between rows of spinning holes (p +)

Claims (1)

[Claims] (1) Melt spinning is performed using a spinneret in which spinning holes are divided into three or more groups according to the number of spindles, the spun yarn is cooled by a horizontal blowing device, and the spinning speed is 3 to 8 km/h. m
In multi-spindle melt spinning, which is taken up in
) A high-speed multi-spindle melt spinning method characterized by simultaneously satisfying the following conditions. (a) The spinning holes are orthogonally arranged in matrix and the number of rows is 8.
Must be below. (b) Gradually increase the pitch between the rows of the spinning holes as you move away from the spraying surface. (c) When the pitch between rows of spinning holes is P_1 (mm) and the average pitch between rows is P_2 (mm), P_1≦P_2≦
6.