JP5147338B2 - Heat-resistant elastic filamentous body and method for producing the same - Google Patents

Description

  The present invention relates to an elastic thread-like body excellent in heat resistance and a structure including the thread-like body.

The elastic filamentous material generally contains rubber, polyurethane-based elastic long fiber, conjugate yarn, false twisted yarn and the like.
As a technique for improving the heat resistance of elastic yarns or elastic fibers (hereinafter generically referred to as elastic yarns), heat-resistant polyurethane elastic yarn (Patent Document 1), elastic modulus, alkali resistance and heat resistance A method for producing high elastic fibers (Patent Document 2), a coated elastic yarn excellent in heat resistance, a shrinkable fabric, and a dyeing method thereof (Patent Document 3) are disclosed.

However, all of the above elastic filaments have the disadvantage that the stretchability is greatly reduced when exposed to high temperatures for a long time, and the heat resistance is not sufficient, so the upper limit of the use temperature is limited, and industrial materials It was not satisfactory as.
On the other hand, coiled springs are used in various industrial applications and can be said to be elastic bodies that can be used even at high temperatures.
However, when the coil spring is extended, a gap is opened, and other objects are sandwiched in the gap. Therefore, the coil spring is generally used without any obstacle between both ends holding the coil spring.

Since long coil springs are very difficult to handle, the coil springs generally have Lmm (coil length) / Dmm (coil diameter) of 100 or less, and no L / D exceeds 100. .
For example, a coil having a coil diameter (D) of 1 mm and a coil length (L) of 100 mm is not known, and cannot be used as a filament.
As a coating for the coil spring, a foamed elastic body in which a metal coil spring is embedded has been proposed (Patent Document 4). However, L / D <100, and it was not handled as an elastic filament.
In view of the above situation, the present invention provides an elastic thread-like body that can be used at high temperatures and a structure including the elastic thread-like body.

Japanese Patent No. 2773743 Special table 2007-504370 gazette JP-A-5-78937 JP-A 61-184238

  An object of the present invention is to provide an elastic thread-like body that can be used at a high temperature and a structure including the elastic thread-like body.

As a result of intensive studies to obtain an elastic yarn-like body that can be used even at high temperatures, the inventor of the present invention has an elastic yarn that can be used even at high temperatures by braiding and covering the cylindrical outer circumference of a continuous coil spring with multifilaments or spun yarns. The present inventors have found that a state can be obtained and have reached the present invention.
That is, the present invention is as follows.
(1) The continuous coil length L (mm)> 1000, the coil diameter D (mm) <10, and the continuous coil spring having L / D> 100 is included in the core, and the cylinder of the continuous coil spring is included. A heat-resistant elastic yarn-like body having a braided outer periphery formed by multifilament or spun yarn. (2) The continuous coil spring is made of metal, and the relationship between the coil diameter Dmm and the wire drawing (wire material forming the coil) diameter dmm is 24> D / d> 4, 1 mm>d> 0.01 mm. The coil-pitch interval is 0.5 D or less, and the heat-resistant elastic filamentous material according to (1) above.
(3) The heat-resistant elastic filamentous material according to (1), wherein the continuous coil spring is braided under extension.
(4) A heat-resistant elastic structure comprising at least part of the heat-resistant elastic filamentous body according to any one of (1) to (3) above.

  The heat-resistant elastic filamentous body of the present invention can be used at high temperatures and is suitable as an elastic material in the industrial field.

The present invention will be specifically described below.
The elastic filamentous body of the present invention includes a continuous coil spring having a continuous coil length L (mm)> 1000, a coil diameter D (mm) <10, and L / D> 100 in a core portion. It can be obtained by forming a braid with a multifilament or spun yarn on the cylindrical outer periphery of the spring.
It is important that the length (Lmm) of the continuous coil spring is 1000 mm or more.
When it is less than 1000 mm, it is difficult to form a braid on the outer periphery, and it is difficult to use it as a practical filament.
It is important that the coil diameter (Dmm) is 10 mm or less. In the case of more than this, the handleability of the textile product in the processing machine is poor, and it is practically difficult to use it as a filament.
Moreover, it is important that L / D is 100 or more. When L / D is less than 100, it is difficult to use the same as a filament.
The continuous coil spring used in the present invention is preferably a metal. There are coil springs other than metal, but they are inferior in terms of repeated deformation and heat resistance. A coil-shaped spring can be designed arbitrarily by selecting a coiling machine and setting the conditions of the selected coiling machine.

It is important that the coil diameter Dmm and the wire drawing (wire material forming the coil) diameter dmm satisfy 24> D / d> 4. When D / d is 24 or more, a spring having a stable shape cannot be obtained, and it is not preferable because it is easily deformed. Preferably, D / d is 16 or less. On the other hand, when D / d is 4 or less, it becomes difficult to form a coil, and at the same time, stretchability is hardly exhibited. Preferably it is the range of 6-15.
It is important that the diameter d of the wire drawing is 1 mm or less. If it is less than 1 mm, the spring becomes heavy, and the stretching stress and the coil diameter increase, which is not preferable.

On the other hand, if the diameter of the wire drawing is 0.01 mm or less, the spring that can be formed is too weak, and even if it is quenched, it is easily deformed when a force is applied from the side, and is not practical.
The coil pitch interval is desirably 0.5 D (mm) or less. A coiled spring can be formed even with an interval longer than this, but it is difficult to form a braid around the outer periphery of the coil. This is not preferable because the stretchability is lowered and the external force easily deforms. Preferably it is 0.1D or less.
When the pitch interval is almost zero, the elasticity can be maximized, the spring itself is hard to get tangled, the wound spring is easy to pull out, and it has the advantage of being strong against deformation due to external force. preferable.

The material of the coil spring can be arbitrarily selected from known wire drawing. Examples of the wire material include piano wire, hard steel wire, stainless steel wire, oil temper wire, phosphor bronze wire, beryllium copper wire, and white wire. Stainless steel wire is desirable because of its excellent corrosion resistance and heat resistance, and easy availability.
A continuous coil-shaped spring can be obtained by coiling a drawn wire with a coiling machine, followed by quenching and cooling. Since the thin coil-shaped spring is easily entangled, it is preferable to perform quenching (tempering) and cooling continuously after the coiling machine.
When winding the spring, the coils may overlap and may be difficult to pull out. Such a case can be easily dealt with by winding a thin tape on a coiled spring.

  In the present invention, the cylindrical outer periphery of the continuous coil spring is braided and coated with multifilaments or spun yarns. The fiber material for braiding the cylindrical outer periphery of the spring includes fluorine fiber, aramid fiber, polyphenylene sulfide fiber, polyketone fiber, Carbon fiber, flame-resistant acrylic fiber, polyester fiber, nylon fiber, acrylic fiber, cotton, wool, silk, rayon fiber, cupra fiber, acetate fiber, polypropylene fiber, polyethylene fiber, saran fiber, glass fiber, ceramic fiber, etc. can be used It can be arbitrarily selected according to the application.

Since the contact surface with the spring is easily rubbed due to expansion and contraction, a material excellent in wear resistance is preferable. From the viewpoint of high heat resistance and excellent wear resistance, it is preferable to use fluorine fibers. However, the present invention is not limited to this, and in practice, it can be arbitrarily selected in consideration of practical performance and price depending on the application.
For example, an aramid fiber and a polyphenylene sulfide fiber are mentioned as those having excellent heat resistance.
When emphasizing versatility, nylon fibers and polyester fibers can be mentioned.
In the case where fire resistance is required, glass fiber, inorganic fiber, fluorine fiber, flame-resistant acrylic, and saran fiber can be exemplified.
When emphasizing design properties, acrylic fibers with good color can be used.
Furthermore, when importance is attached to the tactile sensation due to human contact, cellulosic fibers such as cupra, acetate, cotton, and rayon, silk, or synthetic fibers with fine fineness can be used.

In addition, the braided coating may have a bulky property. Since the spring itself feels hard, the tactile sensation is improved by covering the periphery with something having a bulky property. Further, by using a material having a bulky property, a buffering action can be expected, and resistance to external force and deformation is increased.
A braided coating having a bulky property can be obtained by using a multifilament or spun yarn having a bulky property and braiding so as not to be over-tightened. A too rough braid is not preferable because the coating is insufficient.

  A bulky multifilament or spun yarn can be obtained by a known method. For example, one or more types of multifilaments can be arranged and false twisted, or conjugate yarn multifilaments can be used. In the spun yarn, one or more kinds of short fibers are mixed and spun to obtain bulkiness. In particular, it is possible to obtain a spun yarn having high bulkiness by mixing, spinning, and heat-treating short fibers having different heat shrinkage rates.

Examples of insulating fibers that are versatile and have good wear and bulkiness include wooly nylon and ester wooly yarn.
It is also possible to combine insulating fibers having excellent wear properties and insulating fibers having a bulky property (mixed spinning, combining yarns, or multiple coatings).
The fiber material used for the braiding may be a raw yarn, but an original yarn or a pre-dyed yarn can also be used from the viewpoint of design properties and prevention of deterioration. By finishing, flexibility and friction can be improved. Furthermore, improve the handleability in practical use by speeding up the processing of known fibers such as flame retardant processing, water repellent processing, oil repellent processing, antifouling processing, antibacterial processing, antibacterial processing, deodorization processing, etc. You can also.

  It is important that the elastic filamentous body of the present invention is covered with a cylindrical fiber formed around a braided string or a braided string with the coiled spring extended. Preferably, the filamentous body having high stretchability can be obtained by coating under elongation of 30% or more, more preferably 50% or more.

The heat-resistant elastic structure containing at least a part of the heat-resistant elastic filamentous body of the present invention means a string, a tape, a sheet, a net, a net, a fabric or the like partially using the heat-resistant elastic filamentous body. These are heat-resistant elastic filaments processed by a known processing method to form a rope, to be attached to a part of a fabric or a net as a mouth rubber of clothes or gloves, a storage container, It can be a restraining tool.
At this time, it is preferable that the cut surface of the heat-resistant elastic filamentous body is folded back or covered with an adhesive or the like so that the metal is not exposed.
The structure thus obtained is used for applications requiring elasticity and applications requiring durability even when exposed to high temperatures.
As a specific example, it can be a rubber band such as a fire fighting suit used at a fire extinguishing site, a heat-resistant protective clothing used at a welding site, or a heat-resistant glove used at any scene.
Moreover, when it is used as a rubber string constituting a net of a storage tool provided in a bus or train seat, the durability can be greatly improved.
On the other hand, the stretchable rope is easy to fix the object and can be used in various situations,
Ordinary rubber is easily deteriorated and its use range is limited. Even in such a scene, the usable range can be expanded and the durability can be improved by the string-like material or the tape-like material containing the heat-resistant elastic thread-like material of the present invention.
For example, it is possible to provide a rubber band or rubber tape attached to a seat cover used in an automobile.
In this way, we have developed an innovative elastic filamentous body that dramatically improves the durability of the so-called “rubber has been damaged by the cold” and a structure using it. It is to provide.

The present invention will be described based on examples.
The evaluation method used in the present invention is as follows.
(1) Coiling state Coiling was performed using a coiling machine, and the following criteria were used.
Continuous coiling with 10 or more coils is possible. : ○
Continuous coiling with 10 or more coils is not possible. : ×
(2) Braidability to coil Using a stringing machine according to the coil diameter, a braid was formed from ester fibers while stretching the coil, and the following criteria were used.
We were able to form a braid. : ○
There is no work in the string making machine. : ×
(3) Handleability as a yarn state The braided filament was grasped with both hands, knotted, and judged according to the following criteria.
I was able to make a knot. : ○
I can't make a knot. : ×

(4) 50% elongation stress (cN)
Using a Tensilon measuring instrument placed in a test room controlled in a standard state (20 ° C. 65%), the sample length was 100 mm and the tensile speed was 500 mm / min, and the stress at 50% elongation was determined.
(5) 50% stretch recovery rate (%)
A 100 mm sample was pulled at 500 mm / min with a Tensilon measuring machine, returned after 50% elongation, the distance (Amm) at which the stress became zero was determined, and the recovery rate was determined by the following equation.
50% elongation recovery rate (%) = ((100−A) / 100) × 100
(6) Heat resistance After marking 100 mm in a relaxed state, both ends of the mark were fixed to a metal frame that was stretched 25 mm and 25% stretched. In this stretched state, heat treatment was performed for 16 hours in a drier set at 120 ° C.
After heat treatment, it was allowed to cool at room temperature for 15 minutes and then removed from the metal frame.
The sample was relaxed at room temperature for 15 minutes and the distance between the marks was measured.
Degradation is determined from the length (mm) after the heat treatment test using the following formula, and the recovery rate is calculated as follows: Yes, when the recovery rate is 90% or higher, 70% or higher to 90%, Δ, 50% or higher to 70 Less than% was taken as x, and less than 50% was taken as xx.
Recovery rate (%) = 100 × (25− (length after heat treatment−100)) / 25

[Example 1]
Coiling a stainless steel wire (Sumitomo Metal Steel Wire Co., Ltd.) with a diameter (d) of 0.2 mm using a coiling machine SH-7 (Oriimec Co., Ltd.) and heat-treating at 270 ° C. for 20 minutes with a temper. And cooling to obtain a spring having a pitch interval of zero, a coil diameter (D) of 1.6 mm, and a continuous length (L) of 2000 mm (D / d≈8, L / D≈1250). Using this spring as a core, 220 dt (72f) Woolley Nylon Black was used to perform braiding under 140% elongation with a 16-punch stringing machine to obtain the elastic thread-like body of the present invention.
"Comparative Examples 1 and 2"
In the same manner as in Example 1, coiling was performed on a coiling machine using a stainless steel wire having a predetermined diameter, and braiding was performed using a stringing machine to obtain an elastic yarn body. .
When the coil length was less than 1000 mm, the string making machine was not set up and a filamentous body could not be obtained. When the coil diameter was 10 mm or more, knots could not be made by hand, and handling as a filament was difficult.
[Comparative Examples 3 and 4]
An elastic thread-like body was obtained in the same manner as in Example 1 using 10 polyurethane elastic yarns 18700 dt or round rubber (# 12) as a core.

  The heat-resistant elastic filamentous body of the present invention can be used at high temperatures and can be suitably used as an elastic material in the industrial field.

Structure of elastic filament Cross-sectional schematic diagram of FIG.

Claims (4)

A continuous coil spring having a continuous coil length L (mm)> 1000, a coil diameter D (mm) <10, and L / D> 100 is included in the core, and a cylindrical outer periphery of the continuous coil spring is included. Stretch heat-resistant elastic filamentous material characterized by being braided with multifilament or spun yarn (however, a braiding composition in which a thread-impregnated resin is wound around a spring member in a braided shape, and heated Excluding those used for frame structures consisting of braided structures that are molded by curing.) The continuous coil spring is made of metal, and the relationship between the coil diameter Dmm and the wire drawing (wire material forming the coil) diameter dmm is 24> D / d> 4, 1 mm>d> 0.01 mm, The stretchable heat-resistant elastic filamentous material according to claim 1, wherein the coil pitch interval is 0.5D or less. The method for producing a stretchable heat-resistant elastic thread according to claim 1 or 2, wherein the continuous coil spring is braided under stretch . Heat-resistant elastic structure which comprises at least a portion of the stretch resistant elastic filaments according to any one of claims 1-2.

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