JP2002020939A - Narrow woven fabric and belt string using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a narrow woven fabric which scarcely sags, even when used for a long time or repeatedly used, can prevent a trouble that a hung baggage drops, and has a highly excellent elongation recovery property, and to provide a belt string using the narrow woven fabric. SOLUTION: (1) This narrow woven fabric in which polytrimethylene terephthalate multifilament yarns are used as at least warps has a stress retention of >=85%, after held in an elongated state under a load of 1/5 of the breaking strength in the warp direction of the woven fabric for 15 min. (2) The belt string is composed of the narrow woven fabric.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to narrow fabrics and belt slings, and more particularly, to excellent dimensional retention due to excellent elongation recovery, excellent handling and storage due to soft texture, Further, the present invention relates to a narrow woven fabric excellent in wear resistance and a belt sling using the same.

[0002]

2. Description of the Related Art Conventionally, a belt sling made of cloth is superior in flexibility as compared with a wire rope or the like, and is often used in terms of handleability and storability. As woven fabrics for belt slings, twisted yarns of multifilament yarns such as regular polyester fiber, polyamide fiber, polypropylene fiber, and ultra-high-strength aromatic polyamide fiber (aramid fiber) or twisted yarns such as natural fibers such as cotton and hemp are used. Narrow woven fabrics used for warp or weft are known.

[0003] Of these, those using regular polyester fiber multifilament yarn are generally most frequently used because they are relatively inexpensive and have excellent water resistance and weather resistance. However, narrow woven fabrics using regular polyester fiber multifilament yarns at least as warp have poor elastic recovery due to the crystal structure unique to polyester fibers, and can be used under tension for a long time,
The stress relaxation progresses with the number of times of repeated use, and the belt sling dimensions gradually increase, causing differences in the dimensions between belts of the same standard, the left-right balance of the suspended load is lost, and the suspended load tilts or There is a drawback that extremely dangerous troubles such as dropping easily occur. In addition, there was a problem in terms of durability due to poor wear resistance.

[0004] In the case of using a polyamide fiber (such as nylon 66) multifilament yarn, the elongation and recovery performance is slightly better than that of regular polyester, but depending on the weather conditions (temperature, humidity, water wetness, etc.) during storage or at the site of use. Dimensional changes are likely to occur, and as in the case of regular polyester fibers, the left-right balance of the suspended load is lost, and extremely dangerous troubles such as a tilted suspended load and a dropped suspended load are likely to occur. A belt sling using a polypropylene fiber multifilament yarn is inexpensive and has an advantage of excellent chemical resistance, but has the same problem as the belt sling using the polyester fiber or the polyamide fiber. In belt slings using natural fibers such as cotton and hemp, the belt tends to stretch due to water wetting due to rainfall, which may cause the load to fall, and if wet, the weight of the belt may become abnormal due to water content. Workability was further reduced, and there were many issues in terms of maintenance and storage / storage.

[0005] Further, a belt sling using aramid fiber multifilament yarn can obtain a relatively high strength, but the product cost becomes extremely high, and the strength utilization rate when fabricating is extremely lowered. Therefore, the strength loss is large and cannot be said to be rational. Further, there are many difficulties in terms of water resistance, weather resistance, and wear resistance. As described above, the conventional belt sling cannot satisfy various functions required by the user. Therefore, there has been a strong demand for the development of a belt sling which is rich in dimensional retention, has a soft feel, is excellent in handleability and storability, and has excellent wear resistance.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems of the prior art, to reduce the sag even after prolonged use or repeated use, to prevent the trouble of dropping the suspended load, and to improve the stretch recovery. An object of the present invention is to provide an extremely narrow fabric and a belt sling using the same.

[0007]

SUMMARY OF THE INVENTION In view of the above problems, the present inventors have found that the conventional unbalance phenomenon of the suspended load of the belt sling causes the stress relaxation phenomenon (creep phenomenon) in the warp direction of the narrow fabric forming the belt. As a result of intensive studies on the elongation and recovery behavior of various fiber materials, the inventors have found that the above problems can be achieved by using at least a specific fiber material for the warp, and have reached the present invention. It is.

That is, the invention claimed in the present application is as follows. (1) A fabric in which a polytrimethylene terephthalate fiber multifilament yarn is used for at least a warp yarn, and a stress retention after 15 minutes in a stretched state in which a load of 1/5 of breaking strength is applied in the warp direction of the fabric. A narrow fabric having a ratio of 85% or more. (2) A belt sling made of the narrow fabric.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In a narrow fabric according to the present invention, a polytrimethylene terephthalate fiber multifilament yarn is used at least for a warp. The polytrimethylene terephthalate fiber used in the present invention is a polyester fiber having a trimethylene terephthalate unit as a main repeating unit. For example, the trimethylene terephthalate unit contains about 50 mol% or more, preferably 70 mol% or more,
More preferably 80 mol% or more, more preferably 9 mol% or more.
It refers to those having 0 mol% or more. Therefore, as a third component,
The total amount of other acid components and / or glycol components is
It includes polytrimethylene terephthalate fibers contained in a range of about 50 mol% or less, preferably 30 mol% or less, more preferably 20 mol% or less, and still more preferably 10 mol% or less.

[0010] Polytrimethylene terephthalate is obtained by converting terephthalic acid or a functional derivative thereof and trimethylene glycol or a functional derivative thereof in the presence of a catalyst.
It is synthesized by binding under appropriate reaction conditions. In this synthesis process, one or more suitable third components may be added to form a copolymerized polyester. Polyesters other than polytrimethylene terephthalate such as polyethylene terephthalate, nylon, and polytrimethylene terephthalate are separately synthesized.
It may be blended or composite spun (sheath core, side-by-side, etc.).

The third component to be added includes aliphatic dicarboxylic acids such as oxalic acid and adipic acid, alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid, aromatic dicarboxylic acids such as isophthalic acid and sodium sulfoisophthalic acid, and ethylene. Glycols, aliphatic glycols such as 1,2-propylene glycol and tetramethylene glycol, alicyclic glycols such as cyclohexanedimethanol, aliphatic glycols containing aromatics such as 1,4-bis (β-hydroxyethoxy) benzene, Polyether glycols such as polyethylene glycol and polypropylene glycol, ω-
Examples include aliphatic oxycarboxylic acids such as oxycaproic acid and aromatic oxycarboxylic acids such as P-oxybenzoic acid. Compounds such as benzoic acid or glycerin having one or three or more ester-forming functional groups can be used as long as the polymer is substantially linear. Further, matting agents such as titanium dioxide, stabilizers such as phosphoric acid, ultraviolet absorbers such as hydroxybenzophenone derivatives, crystallization nucleating agents such as talc, lubricating agents such as aerosil, antioxidants such as hindered phenol derivatives, and the like. A fuel, an antistatic agent, a pigment, a fluorescent brightener, an infrared absorber, an antifoaming agent and the like may be contained.

The method of spinning the polytrimethylene terephthalate fiber is not particularly limited. For example, a method of obtaining an undrawn yarn at a winding speed of about 1500 m / min, and then twisting it at about 2 to 3.5 times, Examples include a direct drawing method (spin draw method) in which a spinning-drawing process is directly connected, and a high-speed spinning method (spin take-up method) with a winding speed of 5000 m / min or more. The fiber properties of the raw polytrimethylene terephthalate yarn are such that the elastic recovery at 10% elongation is 70% from the viewpoint of preventing a reduction in the recovery from load elongation when used in a belt sling.
%, More preferably 80 to 10%.
0%. In the present invention, the form of the polytrimethylene terephthalate fiber used for the warp needs to be a multifilament yarn. When a monofilament yarn is used, the stiffness in the warp direction is increased, so that the handleability and the storability are reduced, and the elongation recovery in the warp direction required for the belt sling is reduced.

[0013] The multifilament yarn may be uniform in the length direction or thick and thin.
Round, triangular, L-shaped, T-shaped, Y-shaped, W-shaped, Yatsuha-shaped, flat,
A polygonal type such as a dog bone type, a multi-leaf type, a hollow type or an irregular type may be used. The single-filament fineness of the multi-filament yarn is 0.1 to 11.1 from the viewpoint of abrasion resistance and feeling.
It is preferably about 0 dtex, and the fineness of the multifilament yarn is preferably about 56 to 1670 dtex from the viewpoint of arbitrarily setting the design strength and thickness of the narrow woven fabric. The multifilament yarn is optimally a raw yarn, but may be a bulky yarn such as a mixed fiber yarn, a false twist yarn, an air jet yarn, or the like. In addition, composite yarns using multifilament yarns may be used. In addition to silofil and core yarn, which are composites in spinning, alternately twisted yarns, covering yarns, composite false twisted yarns (including elongation difference false twisting), and two-feed air fluid injection It may be a processed yarn, and may be appropriately selected as needed.

Although the multifilament yarn can be used in the form of a non-twisted yarn, a substantially non-twisted yarn or a twisted yarn, it can be used under severe environmental conditions, can improve abrasion resistance, and can be further extended. It is preferable to use the yarn in the form of a twisted yarn from the viewpoints of improving recovery characteristics and enabling weft-free weaving. The form of the twisted yarn may be any of a single yarn twisted yarn, a twin yarn twisted yarn, or a triple yarn twisted yarn, but a twisting set is not required.
In addition, a so-called multi-twisted yarn in which the twist direction of the lower twist and the upper twist is different from each other is preferable, since non-glue weaving is possible, and high friction durability and a soft texture can be obtained.

The twist coefficient (K) of the twisted yarn [= the fineness of the original yarn (d
tex) ^1/2 × twist number (t / m)] is 1,000 to 50,000
It is preferably in the range of 00. If the twist coefficient is less than 1,000, the abrasion resistance is reduced, and the warp may need to be glued. On the other hand, when the twisting coefficient exceeds 5,000, the viscousness becomes strong, and problems are likely to occur in the operability in the preparation step and the weaving step and in the quality of the fabric. In addition, the twist-prevention set may be performed, but when not performed, the crystal structure is not loosened, so that the elongation recovery performance can be maintained at a high level.

In the present invention, the weft of the sling narrow woven fabric is not particularly limited, and regular polyester fibers,
Polypropylene fibers, polyamide fibers, synthetic fibers such as aromatic polyamide fibers, and natural fibers such as cotton and hemp may be used, but it is preferable to use a twisted polytrimethylene terephthalate fiber multifilament yarn used for the warp. preferable. The weft is not limited to the multifilament yarn as long as the function of the warp is not hindered, and a monofilament yarn can be used. Alternatively, fibers having relatively high rigidity may be used in order to maintain the shape of the belt sling in the width direction.

Further, the narrow woven fabric according to the present invention has a stress retention of 85% or more, preferably 90% or more after 15 minutes under an extended state in which a load of 1/5 of the breaking strength of the belt is applied in the warp direction. More preferably, it needs to be 95% or more. When the stress holding ratio is less than 85%, when a continuous load is applied for a long time or when a repeated load is applied, a fatigue phenomenon due to stress relaxation of a belt sling stretched by a load of a suspended load increases. As a result, the belt sling is elongated, and there is a danger of causing a serious accident such as a drop of the suspended load due to an imbalance between the left and right of the suspended load. The stress retention can be measured by a method described later.

The woven structure of the narrow woven fabric is not particularly limited, and a plain woven structure, a twill woven structure, a changed structure derived therefrom, and the like can be used. From the viewpoint of further improving the durability and safety reliability of the belt, the warp knitting is performed by connecting and weaving three narrow layers of independent upper, middle and lower layers together with a warp for bonding. A three-layer woven fabric is preferred. In this way, even if the binding warp is cut, the risk of instantaneous breakage of the belt sling can be avoided. Note that, for example, a structure in which warp floats are long and continuous, such as a satin weave structure, may be inferior in friction durability such as snuggling resistance and pilling resistance.

The density of the narrow woven fabric is adjusted to satisfy the specifications (width, thickness, design strength) of the belt sling,
It is preferable to appropriately select them in consideration of the fineness of the original yarn, the woven structure, and the like. For example, the warp density is determined by the cover factor (C
F) [= fineness (dtex) ^{1/2 of} warp × density of warp (book / inch)], approximately 10,000 to 20,000
It is selected in the range of 0, but is not limited to this. The narrow fabric is usually woven with a width of 15 to 330 mm. As a loom for weaving, a ribbon loom, a needle loom, or the like can be used. Needle loom
In addition to a small shedding amount, high-speed weaving is possible because warp yarns rarely come into contact with the loom parts, which is preferable from the viewpoint of reducing weaving costs.

The belt sling, after weaving, is subjected to an appropriate stretching treatment in the warp direction under heating conditions, whereby the thermal stability is improved and a more excellent elongation recovery function is exhibited. The heating temperature in that case is preferably in the range of 90C to 170C.
If the heating temperature is lower than 90 ° C., the heat holding effect is low, so that the stress holding performance is not sufficiently exhibited. If the heating temperature is higher than 170 ° C., the belt hardens easily due to the heat curing phenomenon of the polytrimethylene terephthalate fiber. In some cases, the handleability and storability may decrease. The stretching ratio is preferably in the range of -3.0% to 5.0%. Stretch rate is-
If it is less than 3.0%, since the slack of the warp in the greige is not sufficiently removed, it is difficult to obtain a high level of stress holding performance.
In a high stretching region exceeding 0%, the power of the stretching machine may be insufficient, or the sewing connection portion of the base fabric for the belt performed during stretching may be broken depending on the design standard of the woven fabric.

In order to improve the abrasion resistance of a belt sling often used in a severe environment, the belt sling is impregnated with a water-soluble polyurethane resin which is excellent in abrasion resistance during stretching and has a flexible resin film. Is more preferable. In order to further improve the smoothness of the belt sling surface, blending a silicon-based smoothing agent in the resin liquid is also an effective processing method. In addition, since the safety factor of the belt sling is stipulated by JIS to be 6 times or more, the elongation recovery performance is evaluated under the load condition of 1/6 or more of the actual breaking strength of the narrow woven fabric used for the belt sling. Is reasonable.

[0022]

The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the invention thereto. In addition,
The stress retention rate of the belt in the examples and the elastic recovery rate of the belt were measured by the following method using the stretching process of the belt,
The ηSP / C and the elastic recovery at the time of 10% elongation of the raw yarn were measured by the following methods. (1) Belt stress retention rate Using a Shimadzu tensile tester, gripping distance 10c
m, 1/100 of the breaking strength of the belt at a tensile speed of 1 cm / min.
The belt was stretched in the warp direction until the tensile stress value (A) corresponding to 5 was reached, and after remaining in this state for 15 minutes, the residual stress value (B) was read and calculated according to the following equation. Stress retention (%) = [B / A] × 100

(2) Elastic recovery rate of belt Using a tensile tester manufactured by Shimadzu Corporation, gripping interval 10c
m, 1/100 of the breaking strength of the belt at a pulling speed of 1 cm / min.
The elongation at the time when the belt was stretched in the warp direction until the tensile stress value corresponding to 5 was reached was defined as the initial elongation (C). In this state, the belt was left for 15 minutes, and then contracted again at the same speed.
A stress-strain curve was drawn, and the elongation when the stress became zero during shrinkage was calculated as the residual elongation (D) according to the following equation. Elastic recovery rate (%) = [(CD) / C] × 100

(3) Measurement of ηSP / C The polymer was dissolved in o-chlorophenol at 90 ° C. at a concentration (C) of 1 g / deciliter, and the resulting solution was transferred to an Ostwald viscometer and the sample was collected at 35 ° C. The falling time (second) (T) of the solution and the falling time (second) (T ₀ ) of the solvent were measured and calculated by the following equation. ηSP / C = (T / T ₀ −1) / C

(4) Elastic recovery rate of the original yarn at 10% elongation The fiber was attached to a tensile tester with a chuck-to-chuck distance of 10 cm, elongated at an elongation rate of 10% at a tensile speed of 20 cm / min, left for 1 minute, and then left , Contract again at the same speed,
A stress-strain curve was drawn, and the elongation when the stress became zero during shrinkage was defined as the residual elongation (E), which was calculated according to the following equation. Elastic recovery at 10% elongation (%) = [(10-E) / 1
0] × 100

Example 1 Polytrimethylene terephthalate having ηSP / C = 0.8 was obtained at a spinning temperature of 265 ° C. and a spinning speed of 1200 m / min to obtain an undrawn yarn, and then a hot roll temperature of 60 ° C. and a hot plate temperature of 140 ° C. Stretching magnification 3 times, stretching speed 800m /
Then, a 334 dtex / 96f drawn yarn was obtained.
The strong elongation, the elastic modulus and the elastic recovery at 10% elongation of the drawn yarn were 4.0 cN / dtex, 44% and 26.5 c, respectively.
N / dtex and 97%. 334d obtained
A tex / 96f polytrimethylene terephthalate fiber yarn was drawn and aligned, and a 55 t / m twisted yarn was used as a warp and a weft, and a three-layered greige of a flat structure with a warp joint type was obtained with a narrow width needle loom. . This machine is set on a stretching machine and impregnated with a water-soluble urethane resin solution at 140 ° C.
10% in the warp direction for 10 minutes at a width of 5.2
A stretched belt having a thickness of 3.8 mm, a density of 201 pieces / inch and a weft density of 46 pieces / inch was obtained. The breaking strength of this belt is 75,610 N / 5.2 cm width, and the breaking elongation is 5
3%. The properties of the obtained stretched belt are shown in Table 1. The stretched belt had excellent stress retention and elastic recovery. Further, it had a soft texture, and was excellent in handleability and storability of the belt sling.

Example 2 In Example 1, a width of 5.1 cm, a thickness of 3.8 mm, a density of 203 lines / inch and a weft density of 45 were used in the same manner as in Example 1 except that the stretching ratio was changed to 3.0%. A belt / inch stretched belt was obtained. The breaking strength of this belt is 75,650 N /
The width was 5.1 cm and the elongation at break was 51%. The properties of the obtained stretched belt are shown in Table 1. The stretched belt had excellent stress retention and elastic recovery. It has a soft texture,
The belt sling was excellent in handling and storage.

Example 3 In Example 1, the width was 5.1 cm, the thickness was 3.8 mm, the density was 204 lines / inch, and the weft density was 45 in the same manner as in Example 1 except that the stretching ratio was changed to 5.0%. A stretched belt having a density of books / inch was obtained. The breaking strength of this belt is 75,670N
/5.1 cm width and elongation at break were 50%. The properties of the obtained stretched belt are shown in Table 1. The stretched belt had excellent stress retention and elastic recovery. Moreover, it had a soft texture, and was excellent in handling and storage of the belt sling.

Example 4 In Example 1, 1,670 dtex / 192 was added to the weft yarn.
5.2 cm in width, 3.7 mm in thickness, and 201 in density in the same manner as in Example 1 except that two polyethylene terephthalate fiber yarns of f were used and the yarn was twisted at 80 t / m.
Thus, a stretched belt having a density of 46 pieces / inch and a weft density of 46 pieces / inch was obtained. The breaking strength of this belt is 75,560 N / 5.2c.
m width and elongation at break were 54%. The properties of the obtained stretched belt are shown in Table 1. The stretched belt had excellent stress retention and elastic recovery. Also, it had a soft texture and was excellent in handling and storage of the belt sling.

Example 5 The same procedure as in Example 4 was carried out except that the stretching ratio was 3.0%, and the width was 5.0 cm, the thickness was 3.7 mm, the density was 203 lines / inch, and the weft density was 45. A belt / inch stretched belt was obtained. The breaking strength of this belt is 75,580 N /
The width was 5.0 cm, and the breaking elongation was 52%. The properties of the obtained stretched belt are shown in Table 1. The stretched belt had excellent stress retention and elastic recovery. It has a soft texture,
The belt sling was excellent in handling and storage.

Example 6 The procedure of Example 4 was repeated, except that the stretching ratio was changed to 5.0%, the width was 5.0 cm, the thickness was 3.7 mm, the density was 203 lines / inch, and the weft density was 45. A belt / inch stretched belt was obtained. The breaking strength of this belt is 75,590 N /
The width was 5.0 cm, and the breaking elongation was 50%. As shown in Table 1, the obtained stretched belt had excellent stress retention and elastic recovery, and had a soft texture, so that the belt sling was excellent in handleability and storability. .

COMPARATIVE EXAMPLE 1 Two layers of 1,670 dtex / 192f polyethylene terephthalate fiber yarns were aligned and 80 t / m twisted yarns were used as warp and weft yarns. A structure greige was obtained. The greige machine is set on a drawing machine, impregnated with a water-soluble urethane resin liquid, and subjected to a 1.0% drawing process in the warp direction at 160 ° C. for 10 minutes.
A stretched belt having a width of 5.2 cm, a thickness of 3.5 mm, a density of 203 pieces / inch and a weft density of 46 pieces / inch was obtained. The breaking strength of this belt was 74,820 N / 5.2 cm width, and the breaking elongation was 20%. The properties of the obtained stretched belt are shown in Table 1, and both the stress retention and the elastic recovery were low. In addition, the texture of the belt sling was hard, and there was some difficulty in handling.

Comparative Example 2 In Comparative Example 1, the width was 5.1 cm, the thickness was 3.5 mm, the density was 205 lines / inch, and the weft density was 45 in the same manner as in Comparative Example 1 except that the stretching ratio was 3.0%. A belt / inch stretched belt was obtained. The breaking strength of this belt is 74,860 N /
The width was 5.1 cm and the elongation at break was 19%. The properties of the obtained stretched belt are shown in Table 1, and both the stress retention and the elastic recovery were low. In addition, the texture of the belt sling was hard, and there was some difficulty in handling.

Comparative Example 3 Comparative Example 1 was the same as Comparative Example 1 except that the stretching ratio was changed to 5.0%, the width was 5.0 cm, the thickness was 3.5 mm, the warp density was 206 / inch, and the weft density was 44. A stretched belt having a density of books / inch was obtained. The breaking strength of this belt is 74,870N
/5.0 cm width and elongation at break were 18%. The properties of the obtained stretched belt are shown in Table 1, and both the stress retention and the elastic recovery were low. In addition, the texture of the belt sling was hard, and there was some difficulty in handling.

[0035]

[Table 1]

[0036]

The narrow woven fabric of the present invention has excellent elongation and recovery properties, and thus has excellent dimensional retention, and has a soft texture, so that it has excellent handling and storage properties, and has excellent abrasion resistance. It is suitable as a material for belt slings. In addition, the belt sling of the present invention stretches with a relatively low load, and therefore has an excellent shock absorbing effect.For example, when used for transporting a helicopter, the belt sling is generated at the moment when the luggage placed on the ground separates from the ground surface. It also has the advantage that the impact of the helicopter frees the security problem of putting the helicopter in the air in danger.

Claims (2)

[Claims] 1. A woven fabric using a polytrimethylene terephthalate fiber multifilament yarn at least as a warp yarn, and a stress after 15 minutes in an elongated state in which a load of 1/5 of breaking strength is applied in the warp direction of the woven fabric. 85% retention
A narrow fabric as described above. 2. A belt sling comprising the narrow fabric according to claim 1.