JP2000136084A - Fiber sling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To judge the deterioration of a core material visually by covering a ring shape core material by a film having a transparentable transparency and arranging a reinforcement fiber. SOLUTION: The core material 1 of a fiber spring is covered by a film 2, which has a transparency with such extent that its inside can be seen through and is arranged with a reinforcement fiber 3. The reinforcement fiber 3 is formed by positioning the synthetic fiber in a lattice shape in the film 2 and on the surface of the film 2 in order to improve the mechanical strength such as the strength and elongation of the film. Thus, the fiber spring can restrain the invasion to the core material inside of the minute dust and liquid giving a bad influence to the core material by covering the ring shape core material bundled the fiber in a splashed pattern by the film and dissolve the aging strength drop of the fiber spring. As the film has a transparent transparency, the sate of the inside core material can be confirmed directly and visually and the deterioration of the core material can be judged easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber sling used for suspending and transporting heavy objects such as steel materials.

[0002]

2. Description of the Related Art Conventionally, in a steel material manufacturing process, an endless annular core material obtained by winding and bundling fibers in a skein shape is used as a fiber sling used when suspending and moving a steel material. Is known.

However, such a fiber protective cover is made of a woven fabric, and during use, fine dust such as dust, stone, sand, and iron scale, and liquids such as rainwater, seawater, oil, and chemicals are used as the woven fabric of the protective cover. Since the fibers constituting the core material pass through gaps in the tissue and are damaged or deteriorated, there is a problem that the strength of the fiber sling decreases over time.

Further, when the core material is deteriorated, it is structurally impossible to directly confirm the degree of deterioration by visual observation since the core material is completely covered with the fiber protective cover, and the deterioration of the core material is impossible. Must be determined by inspections such as the feel of the fiber protective cover from above, such as the hardness and unevenness of the thickness, and it is not possible to easily and accurately determine when to replace and replace the fiber sling. It was difficult, and the judgment required skill. In addition, if the determination is incorrect, the deteriorated fiber sling is continuously used, and there is a problem in maintaining safety.

[0005] In addition, even with a fiber sling that is considered to be usable continuously without deterioration of the core material and no decrease in strength, the protective cover is damaged by fraying, cuts, scratches, hooks, etc. of the sewn portion, and When the core material was exposed, the fiber sling had to be discarded to ensure the safety of the work, and the cost burden for the user was large.

Therefore, in order to solve this problem, as a fiber sling, an annular core material in which fibers are bundled in a skein shape is covered with a transparent film, and the outside of the film is detachable or partially removable. The present inventors have proposed a fiber sling covered with a fiber protective cover having an openable and closable structure (see Japanese Patent Application Laid-Open No. 10-1283).

[0007] The improved fiber sling is covered with a see-through film, and the fiber protective cover can be attached and detached and opened and closed, so that the state of the core material can be directly visually confirmed, for example, deformation or cutting. Thus, it is possible to quickly detect an abnormality occurring in the core material, such as, for example, and it is excellent in safety.

However, when a heavy object such as a heavy steel material is hung, the improved fiber sling causes the film covering the core to receive a compressive load or a tensile load from the hung object or the hook. However, there is a disadvantage that the film is easily damaged such as breakage or a hole by performing the suspending operation several times, and the core material, which is the main purpose of the film, cannot be protected.

For this reason, there has been a long-awaited need for a fiber sling which has both safety that allows the state of the core material of the fiber sling to be directly observed and durability that does not easily cause damage to the film covering the core material.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and suppresses intrusion of fine dust and liquid, which adversely affect the core material, into the core material, and reduces the fiber sling. Safety, convenience, and the ability to eliminate the deterioration in strength over time as much as possible, and to be able to directly check the state of the core material visually, and to judge the degree of deterioration of the core material to properly judge the time of disposal and replacement, An object of the present invention is to provide a fiber sling having high durability and excellent economy.

[0011]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have made intensive studies on the structure of the fiber sling and the material and form of the film covering the core material, and as a result, have reached the present invention. It was done.

That is, the present invention has the following configuration. (1) A fiber sling obtained by covering an annular core material in which fibers are bundled in a skein shape with a film having transparent transparency and a reinforcing fiber disposed thereon. (2) The fiber sling as described in (1) above, wherein the film is made of polyvinyl chloride. (3) The film according to the above (1) or (2), wherein the film contains an ultraviolet shielding agent and / or a pigment.
The described fiber sling. (4) The fiber sling according to the above (1), (2) or (3), wherein the outer side of the film is covered with a fiber cloth having a structure that is detachable or partially openable and closable.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The fiber sling of the present invention includes an annular core material in which fibers are bundled in a skein shape. The annular core material in which the fibers are bundled in a skein shape has a configuration as shown in FIGS. 1 and 2, and refers to a so-called endless fiber sling. It should be noted that an annular core material in which fibers are bundled in a skein shape may be an eye type having annular portions formed at both ends.

The fiber of the core material is a synthetic fiber filament such as a polyester synthetic fiber, a polyamide synthetic fiber, a polypropylene synthetic fiber, a polyvinyl alcohol synthetic fiber, and the like. After several tens of wires are aligned, twisting up to about 300 T / M may be performed, or further twisting may be performed.

The number of times the core material is bundled in a skein shape is not particularly limited, and may be adjusted in accordance with the required strength of the fiber sling. By increasing the number of times of bundling, the strength of the fiber sling can be improved.

As shown in FIG. 2, the fiber sling of the present invention has a structure in which the above-mentioned core material 1 is covered with a film 2. The film 2 used in the present invention has such transparency that the inside can be seen through. To have transparency such as transparent or translucent such that the inside can be seen through means that the core 1
Can be easily confirmed.

The film 2 of the present invention has reinforcing fibers 3 disposed therein. The reinforcing fibers 3 are used for improving mechanical properties such as strength and elongation of the film.
The synthetic fibers described above are arranged in a lattice pattern inside or on the surface of the film 2.

Specifically, the lattice-shaped reinforcing fiber 3 is a sheet in which reinforcing fibers are arranged at regular intervals in a warp direction and a weft direction, and are laid in a grid pattern. The lattice-like reinforcing fibers are sandwiched between two films and laminated, and the reinforcing fibers are arranged in the film, or the lattice-like reinforcing fibers are fixed to one side of the film by pressure bonding, and are attached to the film surface. By arranging the reinforcing fibers, the reinforcing fibers are provided integrally with the film.

In order to improve the mechanical properties of the film in multiple directions, in addition to the above-described warp and weft directions,
A sheet in which reinforcing fibers are arranged in an oblique direction may be used, and may be arranged in the film or on the film surface.

The spacing between the lattices made of reinforcing fibers is not particularly limited, and may be adjusted so as to withstand the compressive load and the tensile load applied to the film. It is necessary to maintain a grid interval at which the state of the material 1 can be easily confirmed.

In the fiber sling of the present invention, by using a reinforcing fiber as a film for covering the core material, damage to the film caused by a compressive load or a tensile load caused by severe use of the fiber sling is suppressed. You can do it.

The material of the film is not particularly limited, but when a polyvinyl chloride film is used, the durability of the film is dramatically improved in combination with the effect of the reinforcing fibers described above. However, damage to the film can be suppressed as much as possible.

The thickness of the film is not particularly limited. However, considering that if the film is too thick, the flexibility and the flexibility of the fiber sling obtained are impaired, the thickness is set to 0.08.
mm or more and 1.5 mm or less.

The film may contain an ultraviolet ray shielding agent and / or a pigment. When the fiber sling is exposed to ultraviolet light, the core material is deteriorated by the ultraviolet light, so that the strength of the fiber sling is reduced. When the film contains an ultraviolet shielding agent or a pigment, the ultraviolet rays can be effectively shielded, and the above-mentioned deterioration of the core material due to the ultraviolet rays can be suppressed.

Further, when the film is colored by containing a pigment, the brand (permissible load) of the obtained fiber sling can be easily identified by the color tone. The ultraviolet shielding agent referred to in the present invention specifically refers to an ultraviolet absorbing agent such as a benzophenone-based, benzotriazole-based, substituted acrylonitrile-based, or salicylate-based, or a ceramic-based ultraviolet shielding agent such as titanium oxide or zinc oxide. ,
There is no particular limitation as long as it has a function of blocking ultraviolet light exposed to the fiber sling and not transmitting the ultraviolet light to the core material covered with the film.

The pigment is not particularly limited either. However, neither the ultraviolet ray shielding agent nor the pigment is capable of securing transparency so that the mechanical properties of the film do not deteriorate and the state of the core material can be easily confirmed. Need to adjust to quantity.

The term "and / or" as used in the present invention means either one or both of them. In the present invention, the above-mentioned film is formed and processed so that the core material is covered with the film.

The structure to be covered includes fine dust and rainwater, such as dust, stone, sand, and iron scale, which adversely affect the core material.
Seawater, oil, liquids such as chemicals, refers to a structure in which the film suppresses the penetration of ultraviolet light and the like into the core material, the structure is not particularly limited as long as the film protects the core material, and is not particularly limited. Specifically, for example, a flat film is bent into a cylindrical shape, and both ends along the longitudinal direction of the film are completely melt-bonded using a welding machine, and the core material is sealed inside the film and formed into a cylindrical shape. The fiber sling which achieves the object of the present invention can be obtained by overlapping the ends at both ends in the longitudinal direction of the film, or by joining the portions with an adhesive tape or by fusion joining. In FIG. 2, reference numeral 4 denotes a fusion bonding portion at both ends of the flat film 2 along the longitudinal direction, and reference numeral 5 denotes an adhesive tape for bonding an overlap portion at both ends in the longitudinal direction of the film 2 formed into a cylindrical shape.

Further, the outer side of the film is woven, knitted or non-woven fabric, for the purpose of preventing film damage such as cuts, abrasions, scratches, etc. of the film expected when using the fiber sling and damage to the core material. To protect the film. An example thereof is shown in FIG. 3, in which the outside of a fiber sling in which a core material 1 is covered with a film 2 is covered with a fiber cloth 6 having a structure that can be detached or partially opened and closed.

The detachable structure means a structure in which the fiber cloth 6 can be opened and closed with a hook-and-loop fastener, a fastener, a button, etc., and can be detached from the fiber sling.
In FIG. 3, reference numeral 7 denotes a hook-and-loop fastener.

The partially openable structure means that the fiber cloth 6 cannot be completely removed from the fiber sling, but a part of the fiber cloth 6 can be opened and closed with a hook-and-loop fastener, a fastener, a button or the like. In this case, it is necessary to set the size and the location of the opening / closing part so that the state of the core material 1 inside can be visually confirmed from the opening / closing part.

The fiber fabric referred to in the present invention is a woven fabric, a knitted fabric, a nonwoven fabric, or the like mainly composed of synthetic fibers such as polyamide synthetic fibers, polyester synthetic fibers, polypropylene synthetic fibers, and polyvinyl alcohol synthetic fibers. Say.

As described above, the fiber sling of the present invention is obtained by coating a ring-shaped core material in which fibers are bundled in a skein shape with a film, so that fine core particles such as fine dust and liquid, which have an adverse effect on the core material. It is possible to suppress intrusion into the inside of the material and to eliminate a decrease in strength of the fiber sling over time. In addition, since the film has transparency that allows the film to be seen through, the state of the core material inside can be directly visually confirmed, and the degree of deterioration of the core material can be easily determined. In addition, since the reinforcing fibers are disposed in the film, mechanical properties such as strength and elongation of the film can be improved, and damage to the film that occurs when a fiber sling is used can be suppressed. Further, since the film contains a pigment or an ultraviolet shielding material, deterioration of the core material due to ultraviolet light can be suppressed.

Further, by covering the outside of the fiber sling with a fiber cloth having a structure that is detachable or partially openable and closable, it is possible to prevent the film from being cut, scratched, scratched, etc. when the fiber sling is used. It is possible to prevent external damage and damage to the core, and at the same time, it is possible to attach and detach and open and close the fiber cloth, so that even if the fiber sling is covered and protected with the fiber cloth, the function of directly checking the state of the core inside can be checked visually. A fiber sling with high safety is obtained, in which the degree of deterioration of the core material can be determined without any damage, and the timing of disposal and replacement can be accurately grasped, which is very useful in industry.

[0035]

Next, the present invention will be described specifically with reference to examples. Example 1 Ten multifilaments of polyethylene terephthalate, brand 3000d / 384f were aligned and 25 T / M
Were twisted 80 times into a skein shape and bundled to obtain an annular core material having a circumference of 2M.

Subsequently, 1500d polyethylene terephthalate multifilaments are arranged in a grid pattern at intervals of 5 mm in the longitudinal and weft directions to obtain reinforcing fibers, which are made of polyvinyl chloride containing a blue pigment and an ultraviolet shielding agent. A translucent film containing 0.7 mm thick blue-colored reinforcing fibers, prepared by laminating and joining two sheets of plastic film, is folded into a tubular shape, and both ends along the longitudinal direction of the film are welded. Completely melt-bonded using a machine, the ends of both ends in the longitudinal direction of the film formed into a cylindrical shape are overlapped, and the portion is made of a 50 mm wide adhesive tape manufactured by SLIONTEC (trademark: filament tape, product number) 9130) to cover the core material to obtain an airtight fiber sling of the present invention.

Example 2 Polyfilament of polypropylene, brand 680 d /
Twenty of 120f are aligned and twisted at 25T / M, wound 180 times into a skein and bundled to form an annular circumference of 2M.
Core material was obtained.

Subsequently, a 1000 d polyethylene terephthalate multifilament arrayed in a grid pattern at 7 mm intervals in the longitudinal and weft directions was used as a reinforcing fiber, which was placed on one surface of a polypropylene film containing a red pigment. A translucent film containing a reinforcing fiber colored red with a thickness of 0.9 mm, prepared by press bonding, was bent into a tubular shape, and both ends along the longitudinal direction of the film were completely melt bonded and formed into a tubular shape. The core material was covered by overlapping the end portions at both ends in the longitudinal direction of the film and fusion-bonding the portions to obtain the fiber sling of the present invention having acid resistance.

Example 3 Twenty polyethylene terephthalate multifilaments, brand 3000d / 384f, were lined up at 25 T / M.
Wrapped in a skein 144 times
An annular core material having a peripheral length of 2.5 M was obtained.

Subsequently, a reinforcing fiber was obtained by arranging 3000d polyethylene terephthalate multifilaments at intervals of 10 mm in the longitudinal and weft directions in a grid pattern.
The transparent film containing reinforcing fibers having a thickness of 0.5 mm, which was prepared by laminating and joining the two films made of polyvinyl chloride containing an ultraviolet shielding agent with scissors, was bent into a cylindrical shape, and was stretched in the longitudinal direction of the film. Both ends along are completely melt-bonded using a welding machine, the ends of both ends in the longitudinal direction of the film formed into a cylindrical shape are overlapped, and the overlapped joint is bonded between the overlapped portions to adhere. A PVC pipe bond (vinyl chloride resin) manufactured by Konishi Co., Ltd. is applied with a brush and adhered by pressing, and further adhered to the surface with a 75 mm wide adhesive tape manufactured by SLIONTEC (trademark: Filament tape, product number 9130) Was wound and joined to cover the core material, and an airtight fiber sling was obtained.

Subsequently, three nylon 6 multifilaments, brand 1260d / 210f, were aligned and 100
T / M twisted warp, brand name 1260d / 21
0f is used for the weft, the warp density is 46 yarns / inch, the weft density is 24
A woven fabric having a length of 21/2 twill and a width of 210 mm was obtained. After dyeing and finishing the woven fabric in a conventional manner, hook-and-loop fasteners were arranged at both ears of the woven fabric, sewn into a freely openable and closable tubular shape, and the fiber sling was detachably covered with the woven fabric.

[0042]

As described above, according to the present invention, an annular core material in which fibers are bundled in a skein shape is covered with a film.
It is possible to provide a fiber sling that can suppress entry of fine dust and liquid, which adversely affect the core material, into the core material, and that hardly causes a decrease in strength over time. In addition, since the film has a transparent transparency, the state of the core material inside can be directly visually confirmed, and the degree of deterioration of the core material can be easily determined. In addition, since the reinforcing fibers are disposed in the film, mechanical properties such as strength and elongation of the film can be improved, and damage to the film that occurs when a fiber sling is used can be suppressed. Further, when the film contains an ultraviolet shielding agent or a pigment, deterioration of the core material due to ultraviolet rays can be suppressed, and the brand (permissible load) of the fiber sling can be easily identified by the color tone.

Further, even if fine damage such as pinholes occurs in the film covering the core material, damage to the film can be immediately sensed due to partial contamination or discoloration of the core material.

Further, by covering the outside of the fiber sling with a fiber cloth having a structure which can be freely detached or partially opened and closed, ultraviolet rays which degrade the core material can be almost completely shielded, and the deterioration of the core material can be reduced. It is possible to reduce as much as possible. In addition, it is possible to prevent film damage such as cuts, abrasions, and scratches expected when using the fiber sling and damage to the core material, and at the same time, it is possible to attach / detach and open / close the fiber cloth. Highly safe fiber sling that can determine the degree of deterioration of the core material and accurately grasp the time of disposal and replacement without impairing the function of directly checking the state of the core material inside even if covered and protected with Is obtained, which is very useful industrially. In addition, by making the fiber cloth detachable from the fiber sling, if the fiber cloth becomes dirty or damaged, remove the fiber cloth from the fiber sling, wash and replace it, until the core material deteriorates and the strength decreases. It can be used repeatedly and is economical.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an example of a fiber sling of the present invention.

FIG. 2 is an enlarged perspective view of a portion A in FIG.

FIG. 3 is an enlarged perspective view of a main part showing another example of the fiber sling of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core material 2 Film 3 Reinforcement fiber 4 Melt joint part 5 Adhesive tape 6 Fiber cloth 7 Surface fastener

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kengo Sasa 1 Kimitsu, Kimitsu City, Chiba Prefecture Inside Nippon Steel Corporation (72) Inventor Hideyuki Yoshida 1 Kimitsu, Kimitsu City, Chiba Prefecture Nippon Steel Corporation (72) Inventor Haruji Kasamori 1-3-3 Asahigaoka, Matsuto City, Ishikawa Prefecture Tamura Sogyo Co., Ltd. (72) Inventor Takashi Horie 1-3-3 Asahigaoka, Matsuto City, Ishikawa Prefecture Tamura Sogyo Co., Ltd. (72) Inventor Kunio Akasaki 23 Uji Kozakura, Uji City, Kyoto Prefecture Unitika Central Research Laboratory (72) Inventor Shuhei Kurata 23 Uji Kozakura Uji City, Kyoto Prefecture Unitika Central Research Laboratory (72) Inventor Kajiwara Koji 4-3-1, Koutaro-cho, Chuo-ku, Osaka-shi, Osaka Unitika F-term (reference) 3F004 LB06

Claims (4)

[Claims] 1. A fiber sling comprising a ring-shaped core material in which fibers are bundled in a skein shape, which is covered with a film having transparent transparency and a reinforcing fiber disposed thereon. 2. The fiber sling according to claim 1, wherein the film is made of polyvinyl chloride. 3. The fiber sling according to claim 1, wherein the film contains an ultraviolet shielding material and / or a pigment. 4. The fiber sling according to claim 1, wherein the outside of the film is covered with a fiber cloth having a detachable or partially openable / closable structure.