JPH05311562A - Method for opening and blending filaments - Google Patents

Abstract

PURPOSE:To enable to open and blend filaments at the monofilament level by separately guiding the same or different kinds of continuous filament bundles through separated bundle guides in the substantially non-twisted state, forcibly subjecting the filament bundles to an electrostatically charging treatment, collecting the charged filaments and subsequently subjecting the collected filament to air-blowing treatment. CONSTITUTION:Substantially non-twisted continuous fiber bundles 2, 2' pulled out from the same or different kinds of at least two filament bundle bobbins 1, 1' are wound up on a pair of taking metal rolls 5, 5' and on a pair of separated rolls 6, 6', respectively, several times in a Nelson pitch state, pulled out and subsequently passed through separated fiber guides. In the processes, the filament bundles 2, 2' are forcibly subjected to an electrostatic charging treatment through frictional members 3, 3' or through forcibly charging devices 4, 4' such as corona charging devices. The charged continuous filament bundles 2, 2' are simultaneously sucked into an air gum 7 and subsequently blown out from the head of the air gum 7 to open the filament bundles 2, 2' into the monofilaments and simultaneously uniformly blend the opened filaments by the diffusing and shaking actions of the air brown out from the air-gum 7, followed by depositing the treated filaments on a collecting surface to provide the objective filament nonwoven fabric.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed fiber opening method in which at least two substantially non-twisted continuous fiber bundles wound up are opened into a monofilament and uniformly mixed to obtain a mixed fiber web. It is about the method. The method for obtaining such a mixed fiber web is used for mixing fibers of hot melt adhesive fibers, mixed fibers of different kinds of fibers, etc., and the mixed fiber web can be collected and adhered in a sheet form to form a long fiber nonwoven fabric. ..

[0002]

2. Description of the Related Art A method of mixing two kinds of untwisted continuous fiber bundles to obtain a web in a mixed fiber state is mainly a method of mixing an adhesive fiber with a main fiber. Or is proposed. For example,
Japanese Examined Patent Publication No. 2-38710 and Japanese Examined Patent Publication No. 1-37509 are cited.

[0003]

All of the above-described fiber mixing methods are carried out by a so-called spunbond manufacturing method in which the main fiber drawing and fiber mixing steps are continuously performed from the spinning stage. However, with these methods, it is difficult to mix various heterogeneous fiber bundles because the spinning process is continuous and the equipment is large. For example, it is not possible to mix fibers such as fibers obtained by melt spinning and fibers obtained by wet spinning. Further, it is difficult to mix the fibers uniformly. The present invention proposes a single-fiber opening method for fiber bundles in which at least two kinds of continuous fiber bundles that have been once unwound in a substantially untwisted state are defibrated into almost monofilament shapes and are uniformly mixed. To do.

[0004]

Means for Solving the Problems The inventors of the present invention have made extensive studies in order to solve the problems that could not be achieved by the conventional techniques described above, and as a result, have reached the invention as shown below. .. That is, according to the present invention, at least two continuous fiber bundles wound in a substantially non-twisted state are charged, then wound around a pair of rolls and sent out, then combined into one and set at a lower position. Introduced into the air gun, which is ejected by the action of high-pressure air sent into the air gun, and at the same time the filament opening action of each filament due to electrification and the air diffusion action open the two fiber bundles into filaments and mix them evenly. It is a method for opening mixed fibers of a fiber bundle, which is characterized by combining them.

The present invention will be described in detail below. The fibers used in the present invention are substantially untwisted continuous filament bundles and are various fibers such as organic fibers, inorganic fibers, synthetic fibers, and chemical fibers, but generally polyester, polyamide, polyolefin, polyvinyl alcohol, polyurethane. , Polycarbonate, aramid, polyarylate,
Rayon fiber, copolyester, copolyamide,
Copolyolefin fibers and the like. The form of use is that which is once taken up by a bobbin or the like. A schematic diagram of the device used in the present invention is shown in FIG. 1, by which its construction is described. Two substantially untwisted continuous fiber bundles
The bobbins 1, 1 ′ are rolled out so that no twist is substantially inserted. The two fiber bundles are passed through different yarn paths so as not to overlap with each other, and are separately charged by a method such as frictional charging, forced charging, or a combination of both. The charging position is 2, 2'before winding the fiber bundle around a pair of Nelson rolls,
Between Nelson rolls, 3, 3 ', or these may be used together. The material of the friction element used for the triboelectrification varies depending on the type of fiber bundle, but a metal rod with a surface chrome plating such as a mirror surface or a matte surface, a copper rod or the like is used. Further, in the forced charging, corona discharge is mainly used. Each of the charged individual fiber bundles has a pair of rolls 4,
4 ′ and separate rolls 5 and 5 ′ are wound in a Nelson shape several times so as not to cause yarn slippage and sent out. At this time, the two fiber bundles are charged and are trying to open due to the repulsive force, so that they are in a very wide state on the roll and the separate roll. For this reason, when two fiber bundles are passed through the same yarn path and simultaneously wound around a roll and a separate roll, the yarns overlap with each other, which causes sticking to the roll. That is, it is important to separate the yarn paths of the two fiber bundles. Further, when the two fiber bundles are passed through the same yarn path, the entanglement of the yarns and the winding of the rolls easily occur due to the difference in tension between the individual fiber bundles.

When the yarn paths of the two fiber bundles are separated, as a method of taking the yarn paths, for example, as shown in FIG. 3, in the case of mixing two fiber bundles, a parallel yarn path is taken. , A pair of rolls and a separate roll are separately wound in parallel in a Nelson shape, and when either one or both of them are normally Nelson-applied when the air gun is introduced at the lower position of the rolls, a little from the traveling direction 7, 7'of the fiber bundle. It is conceivable to introduce two fiber bundles into one air gun at diagonally displaced positions. However, if the yarn is guided in this way, the fiber bundle must be forcibly introduced into the air gun against the traveling direction of the Nelson of the fiber bundle, which is also affected by the electrification of the fiber bundle. However, the fibers cannot be mixed well. Each fiber bundle must be wound on a separate Nelson roll for stable and satisfactory mixed fiber opening. The rolls are arranged on the same side as shown in FIG. 2 even if they are on the opposite side to the air gun as shown in FIG. It doesn't matter. The position of the bobbin is also not particularly limited. When three or more fiber bundles are mixed and opened, they are similarly wound around separate Nelson rolls, then combined into one and introduced into an air gun.

The fibers sent by the rolls and Nelson rolls are simultaneously guided to two air guns 6 for sucking and ejecting the fiber bundles by high pressure air installed between the rolls and slightly below, and ejected from the tip to the air. At this time, the two fiber bundles are charged and uniformly mixed at the monofilament level due to the action of opening the fibers to the form of monofilament by the repulsive force and the diffusion and swinging action of the jet air. The mixed web is collected and adhered by a suitable method to form a long fiber non-woven fabric. As an example of a combination of fibers to be mixed, a mixed fiber of a main fiber and an adhesive fiber for the purpose of adhesion, and a mixed fiber of different fiber types having completely different properties for the purpose of imparting a composite function, Examples thereof can be very diverse, such as mixing fibers of different denier fibers, and it is also possible to mix fibers of different spinning methods such as polyester and rayon such as melt spinning and wet spinning fibers. According to the method of the present invention, various kinds of fibers can be mixed as described above only by using a relatively simple device and process.

[0008]

EXAMPLES The present invention will now be described with reference to specific examples, but the present invention is not limited to these examples.

Example 1 Using the apparatus shown in FIG. 2, a polyethylene terephthalate untwisted continuous fiber bundle 300dr / 144f and a polyester untwisted continuous fiber bundle 30dr / 18f having a slightly lower melting point were fed at a fiber feed rate.
A mixed fiber web was obtained by blowing at 1000 m / min and an air pressure of 2 kgf / cm ² . When this web was thermocompression-bonded and then dyed, and the state of mixed fiber opening was observed with a microscope, both fibers were very finely opened to a monofilament state and were uniformly mixed.

Example 2 High speed spun fiber bundle of polyethylene terephthalate 270dr /
When 48f and continuous spun rayon fiber 300dr / 100f were treated with the apparatus shown in Fig. 2, although a very small amount of bundle-like portion was observed in the rayon yarn, the obtained web was in a state in which both were finely mixed. It was a thing.

Comparative Example 1 Using the apparatus shown in FIG. 2, the same untwisted continuous fiber bundle as in Example 1 was wound into a fiber bundle immediately after the yarn was rolled out, passed through the same yarn path, and rubbed to rub the metal. When they were blown by a roll or the like, the two overlapped on the metal roll, and the fiber bundle was wound around the metal roll and broken.

Comparative Example 2 Two fiber bundles (polyethylene terephthalate fiber 300dr
/ 144f (2 pcs.) And then pass through parallel yarn paths, and after triboelectrification, take out in the state shown in Fig. 3
At the same time, the yarn was introduced and blown. The suction state of the yarn was unstable at the suction port of the air gun, and the fiber bundle was wrapped around the roll.

[0013]

As described above in detail in the embodiments, the method of the present invention is such that after spinning and drawing, two fiber bundles once wound on a bobbin or the like are passed through separate yarn paths and charged. Then
By blowing with an air gun, the two fiber bundles are uniformly mixed at the monofilament level. According to this method, uniform mixed fiber opening of the same kind or different kinds of fiber bundles can be easily realized.

[Brief description of drawings]

FIG. 1 is a schematic view of an example of a mixed fiber opening device used in the present invention.

FIG. 2 is a schematic view of an example of the mixed fiber opening device used in the present invention.

FIG. 3 is a schematic view of a state in which two fiber bundles are wound around a pair of Nelson rolls.

[Explanation of symbols]

 1,1 'Untwisted continuous fiber bundle supply bobbin 2,2' Untwisted fiber bundle unwound from bobbin 3,3 ', 4,4' Friction element or forced charging device 5,5 'Metal take-up roll 6, 6'Separate roll 7 Air gun 8,8 'Normal traveling direction of fiber bundle

Claims (1)

[Claims] 1. At least two continuous fiber bundles wound in a substantially non-twisted state are charged, wound around a pair of rolls and sent out, then combined into one and placed at a lower position. Introduced into the air gun, ejected by the action of high-pressure air sent into the air gun, and at the same time the filament opening action by the charging and the air diffusion action,
A mixed fiber opening method for fiber bundles, which comprises opening two fiber bundles into filaments and mixing them evenly.