JPS644847Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a multi-fiber spinning pack for melt spinning thermoplastic polymers (hereinafter referred to as polymers) such as polyester and polyamide.

In recent years, there has been remarkable research and development into efficiency and rationalization of melt-spinning processes, especially those aimed at improving productivity by increasing spinning speed, and so-called multi-filament spinning processes, in which a large number of continuous filament groups are melt-spun rather than a single spinning pack. Hondori spinning is attracting attention as a means of achieving the above objective. The object of the present invention is to provide a multi-strand spinning pack using a particularly improved heating method in this multi-strand melt spinning apparatus.

Multi-strand spinning requires compact spinning equipment and 1
This spinning method is extremely advantageous compared to book spinning from the viewpoint of reducing the labor involved in assembling and disassembling the spinning pack, as well as reducing the consumption of various filter media, which are consumables. As a spinning device for multi-fiber spinning, a spinning pack having a spinneret in which a group of discharge holes corresponding to the number of yarns to be spun is drilled has been put into practical use.

Creating a multi-fiber spinning pack by drilling a large number of discharge hole groups in a conventional pack nozzle is important for cooling the yarn in the process of forming spun filaments, adhering between the spun filaments, and dividing the yarn groups. It causes a lot of problems in work etc.

Therefore, unlike single-strand spinning packs, multi-strand spinning packs usually have a large spindle diameter and have a large number of discharge holes drilled therein.

Since the single spin pack is relatively small and lightweight, a polymer supply port is provided at the center of the lower surface of the spinning pack, and a polymer introduction port is provided at the center of the upper surface of the spinning pack. A vertical mounting method is generally adopted in which the supply port and the polymer introduction port are aligned, tightly pressed from below to above, and fixedly held on the spin section.

However, the multi-strand spinning pack has become larger and
Due to the increased weight, it becomes extremely difficult to apply the above pack attachment method. Therefore, in a multi-fiber spinning pack, the polymer supply port is provided on the side wall of the spinning section, and the polymer introduction port is provided on the side wall of the spinning pack.
There is a method of inserting and inserting the pack into the spin section from above, aligning the polymer supply port with the polymer introduction port, and pressing the pack tightly in the horizontal direction from the side opposite to the polymer supply port to fix and hold the pack. Generally adopted.

For an overview of installation using this method, see Part 1.
An example of this is shown in the figure, and as a result of testing multi-fiber spinning using such a method, the inventors of the present invention found that
There are extremely problems with operability, such as stable spinning over long periods of time, fluctuation rate of polymer discharge between holes within the nozzle plane, and evenness in yarn quality performance between yarns in a multi-filament group and between filaments within a yarn. We found that there are many

Conventionally, in a multi-fiber spinning device, the spinning packs are each attached to pack holes drilled through partition walls, and the partition walls made of metal improve heat conduction from the heating medium to the inside of the block, and the polymer inside the pack is A method of indirectly heating the temperature uniformly (for example,
49-7211) was proposed. However, it is necessary to make the polymer temperature uniform within the pack of the spinning device, which has become larger and heavier, and has a large diameter and multiple fibers.
The problem of eliminating the stagnation area of the polymer flow at the upper center of the mouthpiece has not yet been solved.

The inventors of the present invention have conducted intensive studies in view of these problems, and as a result have come up with a multi-fiber spinning pack using a particularly improved heating method.

That is, the gist of the present invention is a multi-strand melt-spinning pack, which is characterized in that a heating element penetrating through the spinning pack is disposed in the substantial center of the spinning pack. It is something.

The present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing the internal structure of an example of a conventional multi-filament spinning pack and the attachment of the pack to a spin section, and FIG. 2 is an embodiment of the multi-filament spinning pack of the present invention. FIG. 3 is a longitudinal cross-sectional view showing the internal structure of a pack and its attachment to a spin section. In FIGS. 1 and 2, reference numeral 1 denotes a spin section main body which has a heating means and heats and maintains the spinning pack attached to the spin section at a constant temperature, and 2 indicates a spin section polymer supply port that supplies polymer to the spinning pack. , 3' is a conventional multi-filament spinning pack body, 3 is a multi-filament spinning pack body of the present invention, 4 is a polymer introduction port for introducing polymer into the spinning pack, and 5 is substantially opposite to the polymer supply port 2. This is a spinning pack holding bolt located in the position shown in FIG. 6 is a sealing member that connects and seals the polymer flow path between the polymer supply port 2 and the polymer inlet 4; 7 is a polymer filtration member composed of a wire mesh, filtration sand, a sintered metal filter, etc.; 8 is a large number of A breaker plate having distribution holes, 9 a spinneret with a large number of discharge holes and divided into a plurality of spinnerets, and 10 a bolt etc. that connects the spinneret 9 from below to above (not shown).
11 is an inner cap clamping plate that has the same function as the outer cap clamping plate,
Reference numeral 12 denotes a heating element which penetrates the spinning pack at the substantial center of the spinning pack.

FIG. 3 is a cross-sectional view of the lower part of the spinning pack, excluding the main body of the spin section, as seen from the A-A' plane of FIG. 2 (the multi-fiber spinning pack of the present invention). This is an example showing the distribution of the polymer flow within the pack body 3 and the arrangement of the heating elements 12 within the pack, and the arrows in the figure indicate the flow direction of the polymer.

It has already been explained in detail that the conventional multi-fiber spinning pack as shown in FIG. 1 has many problems in terms of operability, yarn quality, etc. One of the reasons for this is that when spinning multi-filament yarns such as multi-filament spinning, in order to uniformly cool the multi-filament yarn after spinning and to facilitate yarn division, it is necessary to A spinneret without any discharge holes is used as shown in Fig. 1, and since the upper center of the spinneret is filled with polymer gas, a stagnation area of the polymer flow occurs at the upper center of the spinneret surface, causing the above-mentioned problems. It turned out that it was.

In order to solve this drawback, the present inventors developed a non-heating system in which the polymer flow path is not placed in the upper center of the spinneret surface where the polymer flow retention area in the conventional multi-fiber spinning pack occurs, although it is not particularly shown in the drawings. Although spinning was carried out by inserting the above member, the various problems mentioned above could not be solved satisfactorily.

Furthermore, the present inventors have repeatedly studied and found that in the case of conventional large-diameter packs, the temperature distribution between the outer periphery of the pack near the heating element and the center part of the pack far from the heating element is such that the temperature distribution is lower at the center of the pack, and When using the pack mounting method as shown in the figure, if the clearance between the pack and the heating element is uneven on the pack pressing side and the opposite side, an even more severe temperature gradient will occur between the center of the pack and the outer periphery of the pack. I found out that it shows.

That is, by using the multi-fiber spinning pack 3 of the present invention having the central heating element 12 penetrating the spinning pack shown in FIG. The stagnation area of the polymer flow in the center of the spinneret is reduced, and the heating element 12 in the center of the spinning pack makes it possible to heat the center of the spinning pack, making the temperature distribution inside the spinning pack extremely uniform. The various problems associated with multi-fiber spinning packs were solved at once.

The spinning pack main body and the nozzle shape in the present invention may be circular, oval, or rectangular, and a plurality of nozzles may be arranged within the spinning pack. The central heating element is of a type in which a heater is enclosed in a heat transfer body, and may be, for example, what is generally called an aluminum cast heater, and may have a cylindrical shape or an almost regular shape. It may also be a prismatic body with a polygonal cross section.

According to the present invention as described in detail above, in multi-filament spinning, high-quality spun yarn can be obtained which is extremely stable in operation and has no unevenness between multi-filament spun yarns and between filaments within the yarn. be able to.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing the internal structure of an example of a conventional multi-filament spinning pack and the attachment of the pack to the spin section, and FIG. 2 is an inside view of an embodiment of the multi-filament spinning pack of the present invention. A vertical cross-sectional view showing the structure and attachment of the pack to the spin pack, and FIG. 3 is a cross-sectional view of the lower part of the spinning pack excluding the main body of the spinning pack as seen from the plane A-A' in FIG. 1-Spin part main body, 2-Spin part polymer supply port, 3-Pack main body, 4-Polymer introduction port, 9-
Spinneret, 12-central heating element.

Claims (1)

[Scope of utility model registration request] 1. A multi-strand melt-spinning pack, characterized in that a heating element penetrating through the spinning pack is disposed substantially in the center of the spinning pack.