47 results about "Yarn count" patented technology

The utility model discloses a wick strip fabric which comprises a surface layer and a base layer, the surface layer comprises a first convex area and a first concave area, the base layer comprises a second convex area and a second concave area, the bottom end of the first convex area is connected with the top end of the second convex area, and the bottom end of the first concave area is connected with the top end of the second concave area. Two sides of the second convex area are connected with two sides of the first concave area so as to connect the surface layer and the base layer. The surface layer and the base layer form the combination of the filaments and the short fibers of the two system yarns, so that after velvet cutting of the fabric, the short fibers form velvet strips, the filaments below the velvet strips are fixed, the strength of the fabric is improved, the base layer is in a strip shape under the same density, the yarn count of the base layer is smaller than that of the surface layer, and the fabric is more attractive in appearance. Therefore, the air permeability of the fabric is improved, the structural stability of the surface layer is improved, meanwhile, the short fibers of the surface layer are not prone to breakage, and the velvet strips of the surface layer are bound due to the strip shape of the base layer, so that the fabric is not prone to being torn.

The invention discloses a production method for improving the conductivity of a staple fiber blended conductive yarn, and belongs to the technical field of textiles. According to the short fiber blended conductive yarn produced through the ring spinning siro spinning technology, the conductive fibers are in a continuous bundle shape in the yarn body, the fibers are in tight contact, and the contact resistance is small. Compared with the same fiber component, proportion and yarn count, the short fiber blended conductive yarn produced by directly mixing the fibers has the advantage that the conductivity is improved by more than 30%. Meanwhile, under the condition that the same conductivity index requirement is met, the using amount of the conductive fibers can be reduced by about 30%, and the purpose of reducing the production cost is achieved. In addition, different proportions of yarn components and adjustment of conductivity can be achieved through quantitative combination of the conductive fiber roving and the non-conductive fiber roving; the equipment transformation cost is not additionally increased during spinning, and the quality and efficiency of conductive yarn products can be improved.

The breathable non-woven fabric comprises a base layer, a breathable layer and a moisture removal layer which are sequentially arranged from inside to outside, the breathable layer comprises a base surface and an upper convex part, the top end of the upper convex part is attached to the moisture removal layer, the upper convex part and the base layer form a breathable cavity, the base surface is attached to the base layer, and the base surface and the moisture removal layer form a moisture removal cavity. Under the same volume density, rough yarn counts of the base layer form a compact structure to absorb generated water vapor, the breathable layer forms a loose structure through spun yarn counts, the water vapor is evaporated through air circulation through the breathable cavity formed between the breathable layer and the base layer, and redundant water vapor is absorbed through the moisture removal cavity, so that the moisture absorption effect is improved. According to the non-woven fabric, a more compact moisture removal layer is formed through the roving yarns, moisture is discharged in combination with fiber characteristics, meanwhile, the compact structure can prevent external moisture from entering, and therefore the non-woven fabric which is breathable, capable of removing moisture and waterproof is formed.

The invention discloses a fancy yarn blended by wool and cotton and a preparation method of the fancy yarn, and relates to the technical field of textile, the specific steps are as follows: superfine merino wool and high-quality long stapled cotton / combed cotton are selected, the ratio of the wool to cotton fibers is 1: 1, and scale part denudation or passivation treatment is performed on the wool fibers by adopting a biological enzyme or oxidation method; preparing soft wool; a novel fancy spinning technology is adopted, cotton roving and wool roving are synchronously drafted and spun, and blended yarn of a double-face loop structure with the specified yarn count of 9NM is spun; and dyeing, post-processing, detecting and evaluating the spun yarn. The key bottlenecks of cotton and wool blended products in the aspects of comfort (itching), durability (pilling) and dimensional stability (shrinkage) are systematically solved through the processes of wool softening pretreatment, blending proportion optimization, novel fancy spinning yarn formation optimization, 'inner-cotton and outer-wool 'double-sided structure and mild washing enzyme polishing and finishing, and the key bottlenecks of the cotton and wool blended products in the aspects of comfort (itching), durability (pilling) and dimensional stability (shrinkage) are systematically solved.

A cool, moisture-absorbing and quick-dry cotton-feeling elastic fabric comprises an elastic fabric body formed by interweaving warp and weft, the texture structure of the elastic fabric body is twill weave, and the warp adopts covering yarn with the skin layer made of cotton; the weft yarns are covered yarns with flat polyester as covering layers, and grooves are formed in the surface of the flat polyester; the count of the warp yarns is smaller than that of the weft yarns. The scheme that the warp is thicker than the weft is adopted, the twill weave design is combined, the weft covers the reverse side of the fabric, and the cotton appearance of the fabric is kept; through the flat polyester with the grooves in the surface, the contact area of the fabric and the human body is increased, the heat conduction performance of the fabric is improved, and the cool feeling and moisture absorption and quick-drying effects of the fabric are enhanced.

The invention relates to the field of core-spun yarns, and particularly discloses a vortex spinning elastic composite yarn core-spun yarn and a preparation process thereof. The preparation method of the vortex spinning elastic composite yarn core-spun yarn comprises the following steps: (1) compounding elastic fibers and skeleton fibers to prepare elastic composite yarns; (2) carrying out wool combination, blowing-carding and drawing on the short fibers to prepare pretreated short fibers; (3) carrying out vortex spinning on the pretreated short fibers and the elastic composite filaments to prepare vortex spinning elastic composite filament core-spun yarns; the denier number of the elastic composite yarn is 25D-40D, and the twist degree of the elastic composite yarn is 850-1400 twists per meter; the yarn count of the vortex spinning elastic composite yarn covering yarn is 16-40. The covering yarn has the advantages of being high in elasticity and stiffness and smoothness.

A woven textile fabric is provided that includes: a warp spun yarn selected from any of: 100% bamboo spun yarn or a blended yarn having at least 20% bamboo spun yarn and 0-80% cotton spun yarn, with a yarn count of 30 s to 80 s; and a 100% recycled multifilament textured polyester weft yarn with a denier of 10 D to 140 D, wherein the total content of recycled polyester in the fabric is at least about 35%, further wherein the fabric exhibits rating of 2 or above when the fabric is tested for pilling after 1000 rubs. The advantageous fabric has excellent wrinkle resistance, high tensile strength, and low pilling tendency.

The invention provides a bedding suite, and relates to the technical field of household textiles. The bedding suite comprises a quilt cover and a bed sheet. The quilt cover comprises a first fabric layer and a second fabric layer which are sewn together, single-strand yarn with the yarn count of 60-90 S or double-strand yarn with the yarn count of 80-200 S is selected as warp yarn of the first fabric layer, the warp density of the first fabric layer is 120-230 pieces per inch, and the weft density of the first fabric layer is 70-130 pieces per inch; the ratio of the gram weight of the first fabric layer to the gram weight of the second fabric layer is 1.1-1.20; the flatness of the first fabric layer is greater than or equal to level 3, the drip diffusion time of the second fabric layer is less than or equal to 6s, and the air permeability value of the second fabric layer is greater than or equal to 180mm / s; the drop diffusion speed time of the bed sheet is less than or equal to 6s, the flatness is more than or equal to level 3, and the back static friction coefficient of the bed sheet is more than or equal to 0.75. According to the bedding suite, the problem that when a quilt cover and a bed sheet are combined for use, breathability, moisture absorption, softness, flatness and skid resistance cannot be considered at the same time is solved, and the use experience of consumers can be greatly improved.

The utility model discloses a composite jacquard fabric, which relates to the technical field of fabrics and is characterized in that the composite jacquard fabric comprises an inner layer and an outer layer which are fixedly connected with each other, the inner layer is provided with a plurality of breathable grooves and a plurality of fixing grooves, and the end face of the outer layer close to the inner layer is fixedly connected with a plurality of clamping pieces. The outer layer is provided with a plurality of air holes, the air holes are communicated with the air grooves, and the number of yarns at the bottoms of the air grooves and the fixing grooves is larger than that of yarns at other portions of the inner layer. The cotton fibers and the polyamide fibers are arranged, and the overall service life, breathability and wearing comfort of the fabric are improved by means of the characteristics of breathability, wear resistance and good elasticity of materials.

The invention belongs to the technical field of textile processing, and particularly relates to an invisible jacquard knitted household fabric and a production process thereof. The fabric comprises the following components in percentage by weight: 53-56% of cotton, 35-38% of modal and 7-11% of spandex; the yarn count is 40-60 British single yarn, the spandex yarn is 30D, and the spinning mode is compact siro spinning; the fabric is of single-face jacquard weave, jacquard patterns are arranged from bottom to top, each path is formed by weaving 60% cotton / 40% modal blended yarn and spandex yarn together, and the jacquard weave distribution of a needle cylinder is divided into 42 paths from bottom to top. The fabric is formed by weaving cotton / modal and spandex filaments, adopts a single-face jacquard pattern, has the characteristics of softness, comfort, elasticity and good resilience, is not tight to wear, good in draping sense, not prone to deformation, strong in texture sense, excellent in wrinkle resistance and rich in texture layer, and has better texture than smooth fabric.

The utility model discloses a composite covering yarn, which relates to the technical field of covering yarns and is characterized by comprising an inner core, a plurality of reinforcing yarns are arranged on the peripheral wall of the inner core, a plurality of moisture absorption yarns are arranged on the peripheral walls of the reinforcing yarns, and the yarn count of the moisture absorption yarns is higher than that of the reinforcing yarns. Fixed yarns are spirally wound on the outer sides of the reinforcing yarns, the fixed yarns abut against the moisture absorption yarns on the peripheral walls of the reinforcing yarns, a plurality of spun yarns are arranged on the outer sides of the fixed yarns, and the wrapping density of the comfortable yarns is larger than that of the fixed yarns. The spandex fibers are arranged in the core-spun yarn, and the elasticity and the tensile property of the whole core-spun yarn are improved by utilizing the excellent elasticity of the spandex fibers.

The radiation heat protection forest fire extinguishing suit fabric comprises a surface layer, an inner layer and binding yarns used for connecting the two layers. The surface layer is of a tiny concave-convex structure formed by interweaving various fibers and yarns with different yarn counts, and the yarns of the surface layer comprise silver-plated nylon fibers and at least two of polyimide fibers, meta-aramid fibers and para-aramid fibers. The inner layer is formed by weaving inner layer yarns, and at least one of the inner layer yarns comprises para-aramid and flame-retardant viscose. According to the fabric, the radiation heat reflection efficiency is remarkably improved through the cooperation of chemical reflection of the silver-plated nylon fiber on the surface layer and physical diffuse reflection of the macroscopic concave-convex structure. And the inner layer realizes the balance of skin-friendly moisture absorption and high strength. On the premise of not increasing load, the radiation heat protection value and the heat protection performance of the fabric are greatly improved, the fabric has excellent antibacterial performance, antistatic performance and heat and moisture comfort, and all-around safety guarantee is provided for firemen.

The present application relates to the technical field of towel yarn, and particularly relates to a low-feather-loss high-water-absorption and soft elastic wool warp yarn as well as a preparation method and application thereof. The low-feather-loss high-water-absorption and soft elastic wool warp yarn is characterized in that the wool warp yarn is a blended yarn of cotton fibers and double-component elastic fibers, the proportion of the cotton fibers is 90-97%, the proportion of the double-component elastic fibers is 3-10%, the yarn count of the wool warp yarn is between 24.6 tex and 97.2 tex, and the twist factor of the wool warp yarn is between 220 and 280. The product is obtained through a specific cotton blending method, a cotton carding method and a spinning method, and the terry fabric obtained through the wool warp yarn has excellent characteristics such as a pure cotton soft and elastic touch similar to sponge, low feather loss and high water absorption.

The utility model discloses a high-elastic anti-wrinkle oxford fabric, and relates to the technical field of oxford fabrics. According to the technical scheme, the fabric is characterized by comprising two layers of fabric fixed to each other, warp of the fabric is composed of high-elastic roving and high-elastic spun yarn, the high-elastic roving and the high-elastic spun yarn are alternately arranged, the yarn count of the high-elastic roving is one half of that of the high-elastic spun yarn, the surface of the high-elastic roving is slashed with gum, and the surface of the high-elastic roving is slashed with the gum. According to the oxford fabric, the high-elastic roving and the high-elastic spun yarn are arranged, the stable gap is formed between the high-elastic roving and the high-elastic spun yarn, the spandex fibers are added, the durability of the spandex fibers is very good, and the shape and the elasticity of the spandex fibers can be kept after multiple times of stretching and shrinking, so that the oxford fabric added with the spandex has higher elasticity and wrinkle resistance.

The present invention relates to a fabric comprising a first set of warp yarns, in particular comprising staple fibers, and a second set of warp yarns, in particular comprising synthetic filaments. The yarn count of the second group of warp yarns is lower than the yarn count of the first group of warp yarns, and the ratio of the warp yarn density of the first group of warp yarns to the warp yarn density of the second group of warp yarns is less than 2 / 1.

Drawing method and apparatus for an air spinning machine having a plurality of feeders, the method comprising the steps of preparing at least two textile webs to be fed at least by means of respective first and second guide elements located upstream of the air spinning device, drawing the webs separated from one another with a plurality of paired drawing rollers, the invention relates to an air spinning device comprising a plurality of pairs of draw-off rollers, each pair of said draw-off rollers comprising a drive roller and a guide roller, said draw-off rollers being adapted to perform a gradual draw-off of each of said webs simultaneously intercepted by said draw-off rollers, feeding said webs drawn and separated from each other to a spinning chamber of said air spinning device to obtain the desired blended yarn. The invention allows the use of webs of the same yarn count and of which the degree of draw is adjusted directly on the spinning machine, obtaining a final yarn with a final predetermined yarn count and any desired mixing percentage.

The invention discloses an infant textile fabric and a production method thereof, and belongs to the technical field of textiles. The infant textile fabric is composed of a plurality of layers of plain weaves, and both warp yarns and weft yarns are organic cotton; the fabric is six-layer plain weave gauze and is composed of warp yarns and weft yarns of six systems, a six-layer plain weave structure is woven on the same machine table, the yarn counts of the first layer and the second layer and the fifth layer and the sixth layer are thin, and the yarn counts of the third layer and the fourth layer are thick. The six layers of plain gauze are connected with the upper layer of weft yarns through the lower layer of warp yarns. The invention further provides a production method of the infant textile fabric. The infant textile fabric is obtained through a warping process, a slashing process, a denting process and a weaving process in sequence. The problem that a traditional six-layer plain weaving cloth cover is uneven is solved.

The utility model relates to the technical field of zippers, in particular to a single-sided double-layer anti-explosion zipper with a side elastic cloth belt, which is characterized in that the tension resistance, fracture resistance and low elongation of the cloth belt are remarkably improved by optimizing the parameters of warp yarns and weft yarns of the elastic cloth belt (the yarn count of the warp yarns is 81dTex-87dTex, the warp density is 16 pieces per inch to 20 pieces per inch, and the weft yarns are high-elasticity monofilaments); and the zipper is endowed with higher impact resistance. Besides, the fixing strip is arranged between the upper chain rack and the lower chain rack, it is ensured that the distance between the chain teeth is stable, the problem that the chain teeth are staggered due to external force is effectively solved, the zipper is more stable and reliable, the overall anti-explosion performance and use smoothness are greatly improved, and the anti-explosion zipper is particularly suitable for application scenes needing high-strength protection.

The invention discloses a high-strength low-twist yarn and a production method thereof, and belongs to the technical field of textiles. According to the production method of the high-strength low-twist yarn, tencel fibers are used as raw materials, and the high-strength low-twist yarn is produced through the procedures of blowing, cotton carding, drawing and rotor spinning in sequence. In the rotor spinning process, the count is set to be 5S-15S, the twist degree is set to be 200-500 twists per meter, the speed of a spinning cup is set to be 80000-100000 rpm, the speed of a cotton feeding roller is set to be 80-100 m / min, and the air suction negative pressure is set to be-800 Pa to-1000 Pa; the carding roller is subjected to nickel surface treatment; the spinning rotor is subjected to boron plating treatment; and a spiral convex groove is adopted for preventing the twisting head. According to the production method provided by the invention, the performance balance of low twist and high strength is realized, and the effective guarantee of the resultant yarn strength under the condition of low twist is realized.

A rubberized reinforcement layer for articles made of elastomeric material, preferably for vehicle pneumatic tires, wherein the reinforcement layer has a plurality of parallel and spaced-apart reinforcing elements, each reinforcing element consisting of at least one twisted multifilament yarn made of polyethylene terephthalate (PET), wherein the multifilament yarn has a yarn count (fineness) of 50 to 1100 dtex and a fineness-related maximum tensile strength of ≥ 70 cN / tex according to ASTM D885-16, and wherein the rubberizing layer has a thickness D, characterized in that the multifilament yarn has an elongation at break of 10 to 20 % according to ASTM D885-16, a crystallinity determined by DSC of 55 to 65 % and a birefringence Δn with 0.21 ≤ Δn ≤ 0.25.

This invention discloses a method for napping large jacquard fabrics with curved patterns, solving the problems of existing napping methods, which are only suitable for knitted jacquard and straight-line small jacquard fabrics, and suffer from poor uniformity, easy damage to the pattern, and large strength loss when napping curved large jacquard fabrics. This invention employs a fully collaborative design with differentiated twist of pure cotton warp and weft yarns, a two-up-two-down or three-up-one-down right-hand slant weave to reduce the contrast between the fabric's textured surface, equivalent pretreatment of the textured structure, and multi-roller bidirectional napping. The six processes—warp yarn selection, pattern selection, machine tool documentation, weaving, pretreatment, and napping—achieve napping of large jacquard fabrics. Process parameters can be adjusted within a reasonable range to suit curved patterns such as flowers, European styles, and botanicals. This invention has high industrial feasibility, producing fabrics with uniform napping, complete patterns, and meeting strength standards, filling the technological gap in napping curved large jacquard fabrics.

Provided is a pile fabric that can provide both a soft touch feel and durability (pile retention and / or suppression of pile loss). The pile fabric is provided with a base structure formed from a warp and weft and a loop pile formed from pile yarn. The pile yarn is twisted yarn with a twist factor of 2.0 or greater. When the pile yarn is untwisted yarn or weakly twisted yarn, insoluble yarn prior to water soluble yarn elimination is twisted yarn with a twist factor of 2.0 or greater. The proportion of pile height to pile yarn diameter is 40× or greater. The gap between adjacent pile yarn strands is 0.5 mm or less. The pile yarn is 50-120 English yarn count. The loop pile has snarling, and the snarling for adjacent piles is entangled.

A composite fabric and a preparation method therefor. The fabric consists of a base fabric layer (1), an adhesive layer (2) and a plastic film layer (3), wherein the base fabric layer (1) is a fabric formed by interweaving warp and weft yarns having a denier of 50-300 D. The composite fabric is divided into a patterned part (100) and a flat part (200), and the thickness difference between the patterned part (100) and the flat part (200) does not exceed 20 μm. By optimally configuring the pattern part (100) and the flat part (200) of the base fabric layer (1), the contradiction between the aesthetics of the three-dimensional pattern effect and the durability of the final composite fabric product is effectively solved. By means of the optimal yarn count and fabric structure, the composite fabric has a uniform, fine and soft surface and a high-quality feel.

The polyester-mixed cotton cloth comprises a surface layer and a base layer which are sequentially arranged from outside to inside, the surface layer comprises a first area and a second area, the first area is rhombic, the second area is hexagonal, four edges of the first area are respectively connected with four bevel edges of the second area, and the base layer comprises base cloth and a protruding area. The longitudinal diagonal line of the first area is connected with the protruding area, and the two parallel edges of the second area are connected with the protruding area. The double-warp and double-weft weave is added on the basis of the plain weave, friction among the yarns is reduced in the interweaving mode of the plain weave, the interweaving frequency is reduced on the basis that the fabric does not pill, the wear resistance of the fabric is improved, the yarn count of the surface layer is thicker than that of the base layer, and gaps between the warp yarns and the weft yarns of the base layer are large. The double-layer fabric is connected through the binding points, and included angles are formed in some areas where the base layer and the surface layer are connected due to the thickness of yarn counts, so that the air permeability of the fabric is improved.

The invention discloses a high-count cotton-nylon blended yarn and a preparation method and application thereof.The high-count cotton-nylon blended yarn is composed of raw cotton and nylon, the mass ratio of the raw cotton is 80-90%, the mass ratio of the nylon is 10-20%, and the yarn count is 70-80; the chinlon is subjected to spraying curing treatment by adopting an antistatic mixed solution before being prepared, and the antistatic mixed solution is prepared from cocamidopropyl betaine, polyethylene glycol, trisodium citrate and water. According to the invention, the antistatic mixed solution is prepared to pretreat the chinlon, and meanwhile, the process setting in the blending process is matched, so that the defects of low elasticity and easy static accumulation of the chinlon are improved, the cohesive force of the raw cotton and the chinlon is remarkably improved, and the obtained high count yarn is high in strength, antistatic and excellent in hand feeling and is suitable for popularization and application.

The invention discloses a large jacquard fabric sanding method suitable for arc-shaped patterns, and solves the problems that an existing sanding method is only suitable for knitted jacquard and linear small jacquard fabrics, and arc-shaped large jacquard fabrics are poor in uniformity, easy to damage patterns, large in strength loss and the like in sanding. According to the invention, pure cotton warp and weft differential yarn count twist matching is adopted, a two-up two-down right oblique weaving method is adopted to reduce the concave-convex contrast ratio of the fabric, the equivalent pretreatment of a concave-convex structure and the full-process collaborative design of multi-roller bidirectional sanding are adopted, and the sanding of the jacquard fabric is realized through six procedures of warp yarn selection, pattern selection, computer file weaving, weaving, pretreatment and sanding; and process parameters can be adjusted in a reasonable range to adapt to arc flower types such as flowers, European style and plants. The method is high in industrialization feasibility, the obtained fabric is uniform in sanding and complete in pattern, the strength reaches the standard, and the technical blank of arc-shaped jacquard fabric sanding is filled.

The invention relates to the technical field of spinning, in particular to Yun soft spun yarn and a spinning process and equipment thereof. The spinning equipment comprises a spinning frame, a drafting assembly, a winding assembly, a pressurizing assembly and a forming assembly. The Yun soft spinning yarn designed in the scheme is composed of three or more kinds of fine staple cotton and long staple cotton with the cotton assorting length difference being 2 mm or above, so that the uniformity of fibers is reduced, the number of the fibers in unit length is increased, hairiness smaller than 2 mm in the Yun soft spinning yarn is increased, the softness of the yarn is improved, the count of the yarn is 50 Ne or above, and the yarn quality is improved. According to the yarn twisting device, the twisting coefficient range is 240-280, gaps of fibers in a yarn body can be increased, the yarn softness can be improved, meanwhile, low-speed, dispersed and stable pressure exerting can be achieved through multi-stage pressure exerting in combination with the buffering effect of multiple buffers, the yarn is prevented from sliding on a roller, the phenomena of hard heads and uneven yarn evenness are avoided, and the uniform fineness and softness of the yarn are guaranteed.

This invention provides a textured jacquard fabric, its manufacturing method and application, and a sweatshirt. The textured jacquard fabric has a single-layer structure, woven from cotton yarn or cotton-polyester blended yarn, or from cotton yarn and / or cotton-polyester blended yarn and polyester filament. The front of the textured jacquard fabric presents a textured effect, including openwork, twill, or wavy patterns, while the reverse side has a terry loop structure. This invention uses cotton yarn, cotton-polyester blended yarn, or cotton yarn and / or cotton-polyester blended yarn and polyester filament as raw materials. Through variations in yarn count and weaving design, combined with finishing processes, a textured jacquard fabric is obtained where the front can present different textured effects such as openwork, twill, wavy patterns, raised textures, and shimmering stars, while the reverse side retains the looped effect of a sweatshirt. Simultaneously, this textured jacquard fabric also retains the natural softness and fluffy feel, warmth, and wearing comfort (skin-friendly comfort) of a sweatshirt's loops.

The utility model discloses a rotor of a self-cleaning rotor spinning machine, which comprises a cup body, a cup seat and a connecting component, a sliding surface is arranged on the inner wall of the cup body, a condensation groove is arranged at the bottom end of the sliding surface of the cup body, non-stick coatings are coated on the sliding surface of the cup body and the surface of the condensation groove, a connector is arranged at the bottom end of the cup body, and the connector is connected with the cup seat. The center of the cup base is fastened to a spinning machine rotor driving shaft through a screw, a positioning platform matched with a connector at the bottom end of the cup body is arranged at the top end of the cup base, the connecting assembly comprises a positioning pin and a gasket, and the connector of the cup body and the positioning platform of the cup base are fastened through the positioning pin. And the cup body can be conveniently replaced according to different fiber raw materials and yarn count specifications. An enterprise does not need to reserve a large number of whole revolving cup assemblies, and equipment purchase cost is reduced. Due to the split design, the cup body and the cup base can be made of the most matched materials respectively, and the light weight and dynamic balance characteristics are achieved.