JP6710008B2 - Cut resistant spun yarn - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cut-resistant spun yarn having excellent cut strength, a good balance between cut strength and tensile strength, and excellent flexibility, and protective clothing using the spun yarn.

Although general-purpose thermoplastic synthetic fibers such as nylon, polyester, and acrylic fibers are flexible and comfortable fibers for clothing, they are easily cut by cutlery and shear stress, and easily worn and punctured. Therefore, these general-purpose thermoplastic synthetic fibers are clothing products used in situations where there is a great risk of personal injury, such as fire fighting clothing, racing suits, workwear for steelmaking or workwear for welding, and work gloves. It cannot be said that it is suitable as a fiber material for protection of.

On the other hand, glass fibers, ceramic fibers and metal fibers obtained from a hard material are materials having excellent cut resistance, but have low flexibility and lack lightness. Further, the free end of the filament has a risk of piercing the body of an operator or a user, and it cannot be said that it is suitable as a fiber material for protection.

General-purpose thermoplastic synthetic fibers such as nylon and polyester fibers melt at around 250° C. and have a limiting oxygen index of about 20 and burn well in the air, whereas high-performance fibers such as aramid fibers are 250 It does not melt at around ℃ (decomposes at about 400 to 500 ℃), it has a limiting oxygen index of 29 to 30 and burns in the air when the flame is approached, but it cannot continue burning when the flame is moved away. It is a material with excellent flammability. Therefore, aramid fibers are preferred as protective clothing for clothing products used in situations where there is a high risk of exposure to flames and high heat, such as fire fighting clothing, racing suits, workwear for steelmaking and welding, gloves, etc. It is used. Among them, para-aramid fibers having heat resistance, high strength characteristics, and wound resistance are used for work gloves and the like for preventing cut wounds.

However, in the case of manufacturing a protective garment or the like using spun yarn of aramid fiber, the cutting force of the spun yarn and tensile strength or flexibility are in mutual relationship due to the high rigidity of the fiber, and the balance of these characteristics is high. It is extremely difficult to obtain a good spun yarn. That is, if the cutting force or tensile strength is increased, the flexibility becomes poor, and if the flexibility is increased, the cutting force or tensile strength decreases.

Patent Documents 1 and 2 propose the use of a spun yarn in which a meta-aramid fiber and a para-aramid fiber are mixed-spun in a fiber-reinforced resin composite. In such a proposal, in order to improve the affinity between the spun yarn woven and knitted fabric and the resin and the machinability, the meta/para aramid fibers are mixed-spun at a predetermined ratio, and in order to improve the strength of the mixed-spun yarn, The single fiber fineness of the aramid fiber is reduced to increase the number of single fibers in the mixed yarn. However, although the strength of the mixed yarn is improved by the mixed spinning of the meta/para aramid fiber, the processability is equivalent to that of the meta aramid fiber alone, and a spun yarn excellent in cut strength has not been obtained.

On the other hand, in Patent Document 3, in order to obtain a knitted fabric for clothing excellent in heat retention, a spun yarn obtained by mixing two kinds of acrylic short fibers having different single fiber fineness and a difference in single fiber fineness of 0.4 dtex or more. Is proposed to be used. One short fiber has a single fiber fineness of 0.7 dtex or less, and the other short fiber has a single fiber fineness of 1.3 dtex or less in order to prevent the texture from becoming hard. However, such a technique does not target high-performance fibers, and no consideration has been given to the cutting force.

JP, 2002-113788, A JP-A-8-174689 JP, 2010-203000, A

In view of such background of the prior art, the present invention is a cut-resistant spun yarn having a high cutting force and excellent flexibility, and a cut-resistant spinning excellent in flexibility and having a good balance between cutting force and tensile strength. It is intended to provide a yarn and a protective garment using the spun yarn.

In order to solve the above problems, the inventors of the present invention have earnestly studied the relationship between the cut strength, the tensile strength, and the flexibility of the spun yarn, and as a result, the single fiber fineness is 2.8 to 8.0 dtex. By making a spun yarn in which a series of aramid short fibers are mixed-spun at a constant mixing ratio, it is possible to obtain a cut-resistant spun yarn in which the cutting force is improved, the flexibility is imparted, and the tensile strength is retained. As a result, the present invention has reached a cut-resistant spun yarn that can improve all the properties that were conventionally in mutual relation.

(1) 20 to 95 mass of a para-aramid short fiber A having a single fiber fineness of 2.8 to 8.0 dtex, which is a spun yarn prepared by mixing only two or more kinds of aramid short fibers having different single fiber fineness. %, and a cut-resistant spun yarn containing 5 to 80% by mass of para- aramid short fibers B having a single fiber fineness of 1.0 to 2.7 dtex.
(2) When the mixing ratio of the short fibers A is Y (mass %) and the mixing ratio of the short fibers B is 100-Y (mass %), the following formula (I) is satisfied, and the above (1) is described. Cut resistant spun yarn.
AF×Y≧BF×(100−Y) (I)
(AF: Single fiber fineness (dtex) of short fiber A, BF: Single fiber fineness (dtex) of short fiber B)
(3) The cut resistance spun yarn according to (1) or (2) above, wherein the mixing ratio Y of the short fibers A is 20 to 80% by mass and the mixing ratio of the short fibers B is 20 to 80% by mass. ..
(4) The cut-resistant spun yarn according to any one of (1) to (3) above, wherein the single fiber fineness of the para-aramid short fibers A is 3.2 to 4.8 dtex.
(5) A spun yarn obtained by mixing only two or more kinds of aramid short fibers having different single fiber fineness, and 20 to 95 mass of the para-aramid short fibers A having a single fiber fineness of 2.8 to 8.0 dtex. %, and a single fiber fineness of 5 to 80% by mass of para-aramid short fibers B having a fineness of 1.0 to 2.7 dtex, and a twist coefficient K ₂ obtained by the following formula is twisted in a range of _2.5 to 6.0. A protective garment characterized by comprising a cut-resistant spun yarn obtained by .
Twist coefficient K ₂ =T ₁ /s ^1/2 (T ₁ : twist number (twists / 25.4 mm), s: cotton count)

(1) A spun yarn obtained by mixing two or more types of aramid short fibers having different single fiber fineness,
20 to 95% by mass of para-aramid short fibers A having a single fiber fineness of 2.8 to 8.0 dtex, and 5 to 80% by mass of aramid short fibers B having a single fiber fineness of 1.0 to 2.7 dtex. Cut resistant spun yarn.
(2) When the mixing ratio of the short fibers A is Y (mass %) and the mixing ratio of the short fibers B is 100-Y (mass %), the following formula (I) is satisfied, and the above (1) is described. Cut resistant spun yarn.
AF×Y≧BF×(100−Y) (I)
(AF; short fiber A single fiber fineness (dtex), BF; short fiber B single fiber fineness (dtex))
(3) The cut resistance spun yarn according to (1) or (2) above, wherein the mixing ratio Y of the short fibers A is 20 to 80% by mass and the mixing ratio of the short fibers B is 20 to 80% by mass. ..
(4) The cut-resistant spun yarn according to any of (1) to (3) above, wherein the short fiber B is a para-aramid short fiber.
(5) A protective garment characterized by comprising the cut-resistant spun yarn according to any one of (1) to (4) above.

According to the present invention, a cut-resistant spun yarn having high cut strength and excellent flexibility can be obtained by blending high-definition para-aramid short fibers at a predetermined mixing ratio. Further, by mixing the high-fineness para-aramid short fibers at a predetermined mixing ratio, it is possible to obtain a cut-resistant aramid spun yarn that has a good balance between the cut strength and the tensile strength and is excellent in flexibility. These cut-resistant spun yarns are suitable for protective clothing.

It is a graph which shows the relationship between the mixture ratio of a large fineness aramid short fiber, and the cut resistance of a glove. It is a graph showing the relationship between the mixing ratio of the fineness aramid short fibers and the product of the tensile strength of the spun yarn (single yarn, twin yarn) x the cut resistance of the glove.

Hereinafter, the cut resistant spun yarn of the present invention will be described in detail.
The cut resistant spun yarn of the present invention is a spun yarn obtained by mixing two or more kinds of aramid short fibers having different single fiber fineness, and a para-aramid short fiber having a single fiber fineness of 2.8 to 8.0 dtex. 20 to 95 mass% of A and 5 to 80 mass% of aramid short fibers B having a single fiber fineness of 1.0 to 2.7 dtex.

By mixing and spinning such a large fineness para-aramid short fiber A (hereinafter abbreviated as short fiber A) at a predetermined mixing ratio, an aramid short fiber B having a single fiber fineness of 1.0 to 2.7 dtex (hereinafter, It is possible to obtain a cut-resistant spun yarn having a higher cutting force and flexibility than a spun yarn composed of only short fibers B).

The effect of the cut-resistant spun yarn of the present invention is shown, for example, in FIGS. 1 and 2 of Examples described later. That is, as shown in FIG. 1, by setting the mixing ratio of the short fibers A within the range of 20 to 95% by mass, the cutting resistance is high and the cut resistance is high as compared with the spun yarn containing no short fibers A. An original spun yarn can be obtained. If the mixing ratio of the short fibers A is less than 20% by mass, the cutting resistance of the cut-resistant spun yarn will be insufficient, and if it exceeds 95% by mass, it will be difficult to secure the flexibility of the cut-resistant spun yarn. The mixing ratio of the staple fiber A in the cut resistant spun yarn is more preferably 20 to 80% by mass, and particularly preferably 35 to 70% by mass. By setting the mixing ratio of the short fibers A within the above range, as shown in FIG. 2, a spun yarn having improved tensile strength can be obtained without lowering the cut strength of the cut resistant spun yarn. This cut-resistant spun yarn has the product of cut resistance and tensile strength, which is 100 times the cut force divided by the basis weight, as the vertical axis, and the mixture ratio of large fineness para-aramid short fibers (to the spun yarn) as the horizontal axis. When taken, the product of cut resistance and tensile strength shows a maximum value, and the effect becomes remarkable especially in the range of 20 to 80% by mass of the short fiber A.

In the cut resistant spun yarn of the present invention, it is important that the single fiber fineness AF of the short fibers A is in the range of 2.8 to 8.0 dtex, and the single fiber fineness is 2.8 dtex or more, more preferably 3 If it is 0.0 dtex or more, a cut-resistant spun yarn having a high cut strength can be obtained, and if the single fiber fineness is 8.0 dtex or less, more preferably 5.0 dtex or less, a cut-resistant spun yarn having flexibility can be obtained. Because. Since the influence of the single fiber fineness of the short fibers A on each property of the cut resistant spun yarn is relatively small, it may be selected within the above range, but from the viewpoint of imparting tensile strength and improving flexibility, the short fibers The single fiber fineness AF of A is more preferably in the range of 3.2 to 4.8 dtex.

Further, in the cut-resistant spun yarn of the present invention, it is preferable that the following formula (I) is satisfied when the mixing ratio of the short fibers A is Y (mass %) and the mixing ratio of the short fibers B is 100-Y (mass %). ..
AF×Y≧BF×(100−Y) (I)
(AF; short fiber A single fiber fineness (dtex), BF; short fiber B single fiber fineness (dtex))

That is, it is preferable that the four elements of AF, Y, BF, and 100-Y satisfy the above formula (I), and by the formula (I), the product of the single fiber fineness AF and the mixing ratio Y in the short fiber A is short fiber. If the product of the single fiber fineness BF and the mixing ratio (100-Y) in B is equal to or more than the value, the tensile strength and cut strength of the spun yarn are improved in proportion to the number of short fibers. It can be a spun yarn. On the other hand, when the above formula (I) is not satisfied, it becomes difficult to secure the cutting force. The preferable ratio Y of the short fibers A is 40 to 90% by mass, although it varies slightly depending on the single fiber fineness of the short fibers A.

According to the cut-resistant spun yarn of the present invention, as shown in the example of FIG. 1, the cut-resistance is in an equilibrium state when the mixing ratio of the short fibers A is about 65 mass% or more, and the cutting resistance is linear even if the mixing ratio is further increased. Does not improve to This can be presumed to be able to ensure cut resistance by setting the product of the single fiber fineness (thickness) AF of the short fibers A and the number of single fibers to a certain value or more. Therefore, if the product of the single fiber fineness AF of the short fibers A and the mixing ratio Y is larger than the product of the single fiber fineness BF of the short fibers B and the mixing ratio (1-Y), a cut-resistant spun yarn can be obtained.

On the other hand, the single fiber fineness BF of the short fibers B is in the range of 1.0 to 2.7 dtex, and more preferably 1.2 to 2.7 dtex. The fiber fineness BF is selected. From the viewpoint of improving cut resistance, more preferable single fiber fineness BF is in the range of 1.4 to 2.6 dtex.

In the cut resistant spun yarn of the present invention, as the aramid fiber constituting the short fiber B, a meta-aramid fiber and a para-aramid fiber may be used alone or in combination. Here, as the meta-aramid fiber, for example, polymetaphenylene isophthalamide fiber (manufactured by DuPont, trade name "Nomex") can be mentioned, and as the para-aramid fiber, polyparaphenylene terephthalamide fiber (Toray DuPont, trade name "Kevlar"), copolyparaphenylene-3,4'-diphenyl ether terephthalamide fiber (manufactured by Teijin Techno Products, trade name "Technora") and the like. Among these aramid fibers, para-aramid fibers are particularly preferable because they have a high elastic modulus and are excellent in tensile strength and cut strength.
Further, the para-aramid fiber constituting the short fiber A is a polyparaphenylene terephthalamide fiber (manufactured by Toray DuPont, trade name "Kevlar"), a copolyparaphenylene-3,4'-diphenyl ether terephthalamide fiber described above. (Manufactured by Teijin Techno Products Ltd., trade name "Technora") and the like.

The fiber lengths of the short fibers A and the short fibers B are preferably 25 to 1000 mm, more preferably 30 to 100 mm, and particularly preferably 30 to 65 mm from the viewpoint of the flexibility of the cut-resistant spun yarn and the processability in the spinning process and the like. Is.

The cut-resistant spun yarn of the present invention can be produced by existing cotton spinning, soft spinning or worsted spinning equipment after short cutting of continuous yarn having crimps or continuous yarn having no crimps. Although the thickness of the spun yarn depends on the application, it is usually preferably used in the range of 40s to 5s. If it is less than 5 s, the workability of the cut-resistant spun yarn is poor, and if it exceeds 40 s, it becomes difficult to obtain a cut-resistant spun yarn having excellent tensile strength. A preferred form of the cut-resistant spun yarn used for knitting woven or knitted fabrics or gloves is a spun yarn single yarn or a spun yarn twin yarn in which two spun yarn single yarns are aligned and twisted in the opposite direction to the spun yarn single yarn. .. The yarn count of the spun yarn twin yarn is preferably 40/2s to 5/2s, and within the above range, the workability is not significantly impaired.
It should be noted that the English cotton count has a yarn length of 768.10 m (840 yards) per 453.6 g (1 lb) is called the 1st count, and the thinner the yarn, the larger the count.

In order to obtain the cut-resistant spun yarn of the present invention, it is preferable that the single yarn and the double yarn are twisted in a twist coefficient (K ₂ ) calculated by the following formula in a range of 2.5 to 6.0. If the twist coefficient (K ₂ ) is less than 2.5, the entanglement between the aramid short fibers becomes too weak, and the ends of the short fibers tend to stick out of the spun yarn, resulting in a woven and knitted fabric with a lot of tingling. On the other hand, when the twist coefficient (K ₂ ) is more than 6.0, the strength becomes excessively strong, the double twist is strongly generated, the workability is deteriorated, and the tensile strength of the cut-resistant spun yarn is also decreased. The texture tends to deteriorate. A more preferable twist coefficient (K ₂ ) is in the range of 2.5 to 3.5. The twist direction of the cut-resistant spun yarn single yarn may be either S or Z. The twisting direction of the twin yarn is preferably opposite to the twisting direction of the single yarn.

Twisting coefficient K ₂ =T ₁ /s ^1/2
T ₁ : Number of twists (times/25.4 mm)
s: Cotton count

The protective clothing of the invention, in that it consist of cut resistant yarn of 100% of the present invention, a high switching-creation of the spun yarn has a strong and said excellent properties tensile is exerted regret without Although preferred, it may be used in combination with other fibers or yarns such as interwoven or interwoven knitting. Preferably, the cut-resistant spun yarn is in the range of 70 to 100% of the weight of the entire product such as woven fabric and knitted fabric.

Further, the protective garment of the present invention may be composed entirely of the cut resistant spun yarn of the present invention, or may be a partial use thereof. For example, in work gloves, the cut-resistant spun yarn or woven or knitted fabric of the present invention can be used in a specific portion such as a fingertip portion or a palm portion depending on the work content. A resin coating may be applied to the woven or knitted fabric, the protective material, and the protective clothing, if necessary.

The cut-resistant spun yarn and protective clothing of the present invention are particularly suitable for applications that require severe environmental conditions. This includes not only those used for direct protection purposes, but also those that eventually fulfill the protective function. Specifically, other than work or industrial gloves, arm covers, apron, ankle covers, Work shoes, basement socks, work clothes for welding; for sports, sports outerwear, pants, shoes, baseball and soccer socks, fencing uniforms; firefighting clothes, welding work curtains, fire hoses, tire cords , Chair upholstery cloth, various reinforcing cloths, etc., but not limited thereto.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples. In addition, the measuring method of each characteristic value in the following Examples and Comparative Examples is as follows.

[Test method for spun yarn]
JIS L 1095:2010 "General spun yarn test method" 9.5 (single yarn tensile strength and elongation) JIS method a) Standard time, 9.8 (hooking strength), spun yarn single yarn and spun yarn twin The tensile strength of the yarn was evaluated. A tensile tester was used to measure the load (N) when the sample was cut at a gripping interval of 250 mm and a pulling speed of 300 mm/min.

[Cut resistance and cut resistance (cut resistance)]
The cutting force (N) of the palm of the glove was measured according to JIS T 8052:2005 "Protective clothing-Mechanical properties-Test method for cutting resistance to sharp objects". 100 multiplied by divided by SetsuSoryoku (N) of woven or knitted fabric basis weight (g / ^{m 2),} was determined cut resistance. The larger the cut resistance value, the more difficult it was to cut.

[Flexibility]
Judgment when wearing gloves produced in Examples and Comparative Examples and operability of fingers (ease of movement, easiness of bending) were judged, and those with softness and good operability of fingers were evaluated as "○", and those with good hardness. Was determined to be "x".

(Examples 1-3, Comparative Examples 1-2)
As the high fineness para-aramid short fiber A, a para-aramid fiber staple manufactured by Toray DuPont (trade name Kevlar (R), tensile strength 15.7 cN/dtex, limiting oxygen index 29, single fiber fineness 3.33 dtex, fiber length 51 mm, crimp number 8 peaks/2.54 cm) were used.
As ordinary aramid short fiber B, para-aramid fiber staple manufactured by Toray DuPont (trade name Kevlar (R), tensile strength 17.6 cN/dtex, limiting oxygen index 29, single fiber fineness 1.67 dtex, fiber length 51 mm, winding A reduction factor of 8 peaks/2.54 cm) was used.

The high-fineness para-aramid short fibers A and the ordinary para-aramid short fibers B are mixed in the cotton-blowing process by a conventional method at a predetermined ratio (mass ratio) shown in Table 1, and then a card in the spinning process. A spun yarn 20s (cotton count/single yarn) having a twist number of 13.0 (twists/2.54 cm) and a twist direction Z was produced through each process of cotton, kneading, roving, and ring spinning. The twisting coefficient K is 2.9.

Two spun yarns (single yarns) thus obtained were aligned and twisted in the S direction opposite to the single yarn at a twist number of 8.4 (twists/2.54 cm) to obtain a double yarn 20/2s. The twisting coefficient K is 2.7. The twist number ratio (twisted yarn twist number/single yarn twist number) was set to 65%.

Next, 5 spun yarns (20/2s) obtained were supplied to a 7-gauge type glove knitting machine (Shima Seiki Seisakusho Co., Ltd.) to knit a glove having a palm weight of 520 to 570 g/m ^2. It was

(Example 4)
As the high-fineness para-aramid short fiber A, the same para-aramid fiber staple having a single-fiber fineness of 3.33 dtex as used in Example 1 was used.
As the aramid short fiber B, a para-aramid fiber staple manufactured by Toray DuPont (trade name Kevlar (R), tensile strength 18.1 cN/dtex, limiting oxygen index 29, single fiber fineness 1.2 dtex, fiber length 51 mm, crimped) Several 8 peaks/2.54 cm) were used.
20s of spun yarns (cotton count/single yarn) were produced in the same manner as in Example 1, and the yarns were aligned and twisted under the same conditions as in Example 1 to obtain 20/2s double yarns. Five spun yarns (20/2s) thus obtained were supplied to a 7-gauge type glove knitting machine (Shima Seiki Seisakusho Co., Ltd.) to knit gloves with a weight shown in Table 1.

(Example 5)
As the aramid short fiber B, a para-aramid fiber staple manufactured by Toray DuPont (trade name Kevlar (R), tensile strength 16.8 cN/dtex, limiting oxygen index 29, single fiber fineness 2.5 dtex, fiber length 51 mm, crimped) A spun yarn was produced in the same manner as in Example 4 except that several ridges/2.54 cm) were used, and 5 spun yarns (20/2s) obtained were used for a 7 gauge type glove knitting machine (K.K. Shima Seiki Seisakusho) and knitted the gloves with the fabric weight shown in Table 1.

Table 1 shows the results of evaluation of the spun yarns obtained in Examples and Comparative Examples and the gloves knitted with the spun yarns by the above-described test method.
In addition, in Examples 1 to 3 and Comparative Examples 1 and 2, the relationship between the mixing ratio of the large fineness short fibers A and the cut resistance is shown in FIG. 1, and the mixing ratio of the large fineness short fibers A and the spun yarn (single yarn, twin yarn). Fig. 2 shows the relationship between (1) tensile strength x glove cut resistance.

From the results of Table 1 and FIG. 1, the gloves produced in Examples 1 to 3 have a soft and rich texture, and the mixing ratio becomes higher up to the mixing ratio of the short fibers A of 80% by mass. Cut resistance of gloves is improved. Even if the mixing ratio of the short fibers A exceeds 80% by mass, the cut resistance of the gloves was maintained. On the other hand, it was recognized that the tensile strength of the spun yarn decreased almost linearly as the mixing ratio of the short fibers A increased.

Also, when the single fiber fineness of the short fiber B mixed with the thick fineness para-aramid short fiber A is changed (Examples 4 and 5), a glove having a soft and rich texture is obtained, and the cut resistance of the glove is improved. Creativity improved. The larger the monofilament fineness of the short fibers B mixed with the short fibers A, the higher the cut resistance of the glove tends to be, whereas the tensile strength of the spun yarn tends to be decreased.

Further, from FIG. 2, the product of the cut resistance and the tensile strength of the spun yarn twin yarn shows a peak at a mixing ratio of the short fibers A of 50 to 80% by mass, and in particular, a mixing ratio of the short fibers A of 50 to 70% by mass. In the range, it can be seen that a spun yarn having cut strength, tensile strength and flexibility is obtained.

The cut-resistant spun yarn of the present invention and the woven/knitted fabric formed thereof are preferably used as protective clothing such as fire fighting clothes, racing suits, iron/welding work clothes, and gloves.

Claims (5)

A spun yarn obtained by mixing only two or more kinds of aramid short fibers having different single fiber fineness, and a single fiber fineness of ara-aramid short fibers A having a single fiber fineness of 2.8 to 8.0 dtex is 20 to 95% by mass. A cut-resistant spun yarn comprising 5 to 80% by mass of a para- aramid short fiber B having a fiber fineness of 1.0 to 2.7 dtex. The cut resistance according to claim 1, wherein when the mixing ratio of the short fibers A is Y (mass %) and the mixing ratio of the short fibers B is 100-Y (mass %), the following formula (I) is satisfied. Spun yarn.
AF×Y≧BF×(100−Y) (I)
(AF: Single fiber fineness (dtex) of short fiber A, BF: Single fiber fineness (dtex) of short fiber B) The cut resistant spun yarn according to claim 1 or 2, wherein the mixing ratio Y of the short fibers A is 20 to 80% by mass and the mixing ratio of the short fibers B is 20 to 80% by mass. The cut-resistant spun yarn according to any one of claims 1 to 3, wherein the single fiber fineness of the para-aramid short fibers A is 3.2 to 4.8 dtex. A spun yarn obtained by mixing and spinning only two or more aramid short fibers having different single fiber fineness, and a single fiber fineness of ara-aramid short fibers A having a single fiber fineness of 2.8 to 8.0 dtex is 20 to 95% by mass. 5 to 80% by mass of para-aramid short fibers B having a fiber fineness of 1.0 to 2.7 dtex, and twisted in a twist coefficient K ₂ of 2.5 to 6.0 calculated by the following formula. Protective clothing characterized by using cut-resistant spun yarn .
Twist coefficient K ₂ =T ₁ /s ^1/2 (T ₁ : twist number (twists / 25.4 mm), s: cotton count)

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