JPH0342335B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a new, hitherto unknown string-like body (bulky yarn) obtained by defibrating a bundle of a large number of filaments.

[Prior Art] A gas supply method in which a bundle of fibers such as glass fibers (hereinafter referred to as a fiber bundle) is continuously supplied to a bulking device including a tubular passage, and holes are opened in the passage or the outlet of the passage. A method of manufacturing bulky yarn in which high-pressure gas is blown through holes and the fiber bundle is defibrated into individual fibers by the action of this high-pressure gas is widely known, and the bulky yarn obtained in this way has good heat insulation properties. , used for various purposes.

[Problems to be Solved by the Invention] Conventional bulky yarns have the following problems.

When tension is applied to the bulky yarn, the part that is defibrated and swelled in the direction perpendicular to the longitudinal direction (bulky part) is stretched and loses its bulky properties.

Since it is necessary to apply tension to the warp and weft yarns during the textile process, conventional bulky yarns have problems such as loss of bulkiness when used as a material for textiles.

Composite yarns in which bulky yarns are wound around core yarns have also been proposed, but the manufacturing process is complicated, and such composite yarns have the disadvantage that the core yarns separate during handling.

An object of the present invention is to provide a bulky string-like body that does not stretch even when tension is applied, does not separate during handling, and has a simple manufacturing process.

[Means for Solving the Problems] In order to achieve the above object, in the string-like body of the present invention, the string-like body 1 made of a large number of filaments has the following configuration.

Intertwined portions 2 are formed in which the filaments constituting the string-like object 1 are intertwined at spaced apart locations of the string-like object 1, and the string-like object 1 is divided into a plurality of sections 3 by the intertwined sections 2. , in each section 3, the string-like body 1 has a first group of filaments f1 aligned in the longitudinal direction of the string-like body 1, and a second group of filaments _f1 that are disentangled and expanded in a direction perpendicular to the longitudinal direction. _f2 , and the filaments that belong to the first group of filaments in one section are made to belong to the second group of filaments in other sections so that the total length of each filament constituting the string-like body is equal.

Next, the present invention will be explained in more detail.

The filaments that should constitute the string-like body of the present invention include glass fibers, alumina fibers, silica fibers,
Inorganic fibers such as zirconia fibers and titania fibers, organic fibers such as Kevlar fibers, metal fibers such as brass fibers, carbon fibers, or composite fibers made by blending these can be used, but glass fibers or It is preferable to use composite fibers mainly composed of glass fibers.

The thickness of the fibers is suitably 3 to 30 μm, preferably 5 to 25 μm, and a sizing agent is added to these fibers and 50 to 100,000 fibers, preferably 200 to 50,000 fibers are arranged to form a fiber bundle. , such a fiber bundle is fed to the bulking device at a high feeding speed to shorten the residence time of the fiber bundle in the bulking device, and the air supply hole of the bulking device is The string-like body of the present invention can be obtained by selecting bulking conditions such that the bulking conditions can be easily varied, such as opening the opening perpendicular to the tubular passage of the bulking device.

When the air supply hole is opened obliquely to the tubular passage, the air blown into the tubular passage from the air supply hole flows in a fixed direction (fiber exit direction) through the tubular passage, and the air flows toward the fiber exit. However, if the air supply hole is opened perpendicular to the tubular passage, some of the air will also flow out in the direction of the fiber inlet, which is caused by variations in the diameter of the fiber bundle and swaying of the fiber bundle. However, due to changes in the relative positions of the fiber bundles at the entrance and exit of the tubular passage (for example, the fiber bundles are positioned in contact with the lower surface of the passage at the entrance, or are located in the center of the passage at the outlet), the fiber bundles flow out toward the outlet. A change occurs in the ratio of the amount of air flowing in and the amount of air flowing out toward the inlet, and the bulking conditions change.

Also, if the residence time in the bulking device is long,
Fluctuations in bulking conditions are easily averaged out, but if the residence time is short, averaging becomes difficult.

In addition, it is desirable that the drawing speed of the string-like body obtained by the method of the present invention is sufficiently lower than the feeding speed of the fiber bundle as a raw material so that bulking is performed under a low tension state.

As the bulking device, Air Kakoki AT-501 manufactured by Aiki Seisakusho Co., Ltd. can be suitably used. As the sizing agent, it is preferable to use a material with low adhesive strength such as epoxy resin, and the amount added is 0.1 to 10 wt% as solid content, preferably
A suitable content is 0.2 to 5 wt%.

In the string-like body 1 of the present invention, intertwined portions 2, 2, . . . are formed in which the filaments constituting the string-like body are intertwined at locations separated by a predetermined interval in the longitudinal direction.

In the entwined portion 2, the filaments are intertwined in a monofilament form or in a state in which a plurality of filaments are aligned in a braided cord form, and due to this intertwining, the filaments are slightly twisted.

By forming this entwined part 2, the string-like body 1
The filaments constituting the are bonded together so that they do not separate from each other.

The distance between the entangled portions 2 is suitably 1 to 30 mm, preferably 3 to 15 mm. If this length is too small, the proportion of the entangled portion 2 to the entire length of the string-like body becomes large, and the bulkiness of the string-like body 1 becomes poor. Moreover, if this length is too large, the filaments of the first group and the filaments of the second group tend to separate.

The length of the entangled portion 2 is 0.1 to 5 mm, preferably
A suitable value is 0.2 to 3 mm. If this length is too large, the bulkiness of the string-like body 1 will be poor, and if this length is too small, the filaments constituting the string-like body 1 will easily separate.

The string-like body 1 is divided into a plurality of sections 3, 3... by the entangled portion 2.
It is divided into... In the section divided and sectioned by the intertwined portions 2, the string-like body 1 has a first group of filaments f1 aligned in the longitudinal direction of the string-like body and preferably twisted, and a filament _f1 , preferably monofilament-shaped. It includes a second group of filaments f ₂ which are opened into filaments and expanded in a direction perpendicular to the longitudinal direction. The filaments belonging to the second group are defibrated and swell outward in a substantially arc shape from the axis (longitudinal direction of the string-like body) connecting the entangled parts, and are preferably defibrated into a monofilament shape. Note that the direction of this bulge is not limited to a specific plane including the axis;
It's random. It is appropriate that the maximum distance of this bulge from the axis is about 2 to 10 mm.

The filaments belonging to the first group are aligned in the longitudinal direction. This filament is preferably S
The filaments belonging to the first group have good integrity due to the twist in the direction or Z direction.

When focusing on a specific section, the length of the filament _f1 belonging to the first group is the same as that of the filament belonging to the second group.
When tension is applied to the string-like body, filament f ₁ , which is shorter than the length of f ₂ and belongs to the first group, counteracts the tension.

The filament f ₂ belonging to the second group is longer than the filament f ₁ belonging to the first group, swells outward from the longitudinal direction, and does not itself compete with the tension, but this filament f ₂ belongs to the first group. The filament f ₁ and the entwined part 2 are intertwined, and the tension applied to the string-like body 1 is absorbed by the filament f ₁ belonging to the first group, so even if tension is applied to the string-like body 1, the tension in this section is The length does not substantially extend beyond the length of the filament f 1 belonging to the first group, and the length of the filament f ₁ belonging to the first group does not extend substantially
The filament f ₂ belonging to the group is not stretched and loses its bulkiness.

It is appropriate that the number of filaments belonging to the first group is 10 to 50% of the total number of filaments. If this number is too large, the bulkiness of the string-like body 1 will be poor, and if this number is too small, the strength in the longitudinal direction of the string-like body 1 will tend to decrease.

When focusing on a specific section, the filament _f1 , indicated by the broken line belonging to the first group, and the filament _f2 , indicated by the solid line belonging to the second group, are intertwined and confused at the tangled part at the end of this section. In the next section, the filament f ₁ ' belongs to the first group and the filament f ₂ ' belongs to the second group.

At this time, at least part of f ₁ or f ₂ ' is transferred to the second
At least a part of f ₂ transfers to f ₁ ' and belongs to the first group. This kind of transition to a different group (change of affiliation) is done randomly, but when focusing on a certain filament, the number of times this filament belongs to the first group and the number of times it belongs to the second group in each interval are almost equal. Therefore, the total length of each filament constituting the string-like body is equal.

Note that the direction of twist given to the filaments of the first group is reversed in some places, and the number of twists in the S direction and the number of twists in the Z direction are approximately equal in the string-like body as a whole, causing twisting in the string-like body. Never.

A reversal of the twist direction may also occur within a section, in which case a small length of untwisted portion may occur in this reversal.

Note that the filaments belonging to the first group may swell slightly outward at such inverted portions, but this swell is extremely small compared to the swell of the filaments of the second group, and is similar to the above-mentioned string-like filaments. It does not affect the countervailing force to the tension applied to the body.

In addition, the length of the tangled part, the distance between the tangled parts, the number of filaments belonging to the first group in each section,
It is practically meaningless to control the degree of swelling of the filaments belonging to the second group to a constant value over the entire length of the string-like body, and the purpose of the present invention can be sufficiently achieved by keeping these within the above-mentioned range. can be achieved.

Furthermore, the string-like body of the present invention can be composed of relatively soft fibers such as glass fibers and organic fibers,
It can also be composed of brittle fibers such as silica fibers, and it is possible to obtain a string-like body that does not lose bulkiness even when tension is applied, and has high heat resistance, which has not been previously available.

The string-like body of the present invention can be used as a heat-insulating cloth used in the sheet glass bending process, a catalyst carrier, and as a packing material as it is or in the form of a braided string.

[Function] Since the string-like body of the present invention has a tangled portion in which the filaments are entangled, separation of the filaments during handling is prevented.

In addition, in the section formed between the entangled parts,
The string-like body includes a first group of filaments arranged in the longitudinal direction and preferably twisted, and a second group of filaments, preferably monofilament-shaped, which are opened and expanded in a direction perpendicular to the longitudinal direction. The filaments of the first group counteract the tension applied to the string-like body and absorb this tension, so even when tension is applied, the filaments of the second group are prevented from elongating and losing bulkiness. .

[Example] Using a fiber bundle made of 400 glass fibers (filament) with a thickness of 9μ to which 0.2wt% of epoxy sizing agent was added as a solid content, an air supply with holes opened perpendicular to a tubular passage was used. A string-like body having the following specifications was manufactured using an air processing machine AT-501 manufactured by Aiki Seisakusho Co., Ltd., which is equipped with holes.

The fiber bundle supply speed is 120m/sec, the withdrawal speed is 110m/sec, and the average pressure of compressed air is 5.0Kg/sec.
cm ² G.

Specifications of the string-like body Average length of the entangled parts 1 mm, average distance between the entangled parts 5 mm, average number of filaments belonging to the first group 150, degree of swelling of the filaments belonging to the second group (longitudinal Average value of the maximum distance from the direction axis) 3
mm. Even when a tension of 8 kg was applied to this string-like body, the bulkiness was not lost, and it was suitable as a material for textiles.

[Effect of the invention] Even when tension is applied, the bulky property is not lost, and the product does not separate during handling.

[Brief explanation of drawings]

FIG. 1 is an enlarged plan view for schematically explaining the structure of the string-like body of the present invention. In the figure, 1 is a string-like body, 2 is a tangled part, 3 is a section, f ₁ ,
f ₁ ' represents the first group filament, and f ₂ and f ₂ ' represent the second group filament.

Claims (1)

[Claims] 1 A string-like body obtained by defibrating a bundle of a large number of filaments, in which tangled portions are formed where the filaments constituting the string-like body are intertwined at spaces apart from each other. The string-like body is divided into a plurality of sections by this entwined part, and in each section, the string-like body is separated from the first group of filaments that are aligned in the longitudinal direction of the string-like body, and is unraveled and separated in the longitudinal direction. and a second group filament expanding in a direction perpendicular to the filament, and the filaments belonging to the first group filament in one section are the second group filament in another section so that the total length of each filament constituting the string-like body is equal. A cord-like body characterized by belonging to.