Nonwoven needle design and application considerations

1 Design principle of non-woven needles 1.1 How to avoid damage to fibers:
In the production of needle-punched nonwovens, we will find a lot of cilia dust, which is the fiber that the needle has cut during the puncture. The more cilia, the more fibers are cut. This greatly affects the breaking and tensile strength of the nonwoven fabric. Especially for the thin geotextiles, in order to make the fabric layer more solid, and then stab several times, the result is counterproductive, but the cloth surface is more and more punctured, which indicates that the edge of the triangular section of the hook tooth is two during the puncture process. A sharp edge will cut the fiber. How to avoid damage to the fiber during the puncture of the hook teeth is a subject of technical research in the needle industry.
Yulong Needle Co., Ltd. patented product (Y) high-efficiency non-woven needle, the hook tooth design is (Y) type hook tooth, the edge of the contact fiber is arc-shaped, so as to avoid damage to the fiber during puncture, greatly enhanced The strength of the nonwoven fabric.
1.2 How to extend the life of the needle:
When the needle is used for high-speed puncture in the cloth layer, the fiber is rubbed, and the undercut angle of the hook teeth is quickly turned into an obtuse angle, and the ineffective puncture becomes a waste needle. How to make the fiber settle to the bottom of the tooth groove during the puncture process, and let the fiber wear synchronously at the bottom of the hook tooth under the guidance of the hook tooth geometry, so that the hook tooth always maintains a certain lower cutting angle, and there is a good belt. The hair performance, the tooth shape design of the (Y) high-efficiency non-woven needle can achieve the above effects, thus greatly prolonging the service life of the needle.
1.3 Reduce the needle break rate:
The bottom surface of the hook tooth groove is convexly curved, which can disperse mechanical stress and enhance the rigidity of the needle body. The introduction of foreign high-quality special steel, (including V-primary); heat treatment using vacuum recrystallization annealing process; quenching spheroidization treatment, nitriding treatment, secondary tempering, and other advanced processes, are effective measures to enhance the rigidity of the needle body. (Y) high-efficiency non-woven needles have been adopted by more and more non-woven fabric manufacturers in China, replacing imported needles, and the products have been exported to Europe, America and Southeast Asia.
2, some problems encountered in the application of non-woven needles:
Sophisticated equipment, high-quality non-woven needles and advanced production technology complement each other. The selection of reasonable specifications, the best tooth-shaped non-woven needles, and the rational production process are the key to improving the quality of non-woven fabrics. In the past years, I have encountered many practical problems in contact with non-woven fabric manufacturers, and proposed to communicate with you:
2.1 How to enhance the breaking strength of non-woven fabrics:
Introduced in professional theory books (1) using dense teeth; (2) increasing the depth of penetration; (3) increasing the density of acupuncture. The theory is correct, but there are specific conditions, such as blind use, often counterproductive.
Some synthetic leather fabric manufacturers, originally used R pitch (6.3mm) needle, product quality can be; in order to enhance the fracture strength of the base cloth, use the fine tooth C pitch (3.3mm), deepen the penetration depth, the same specifications The tooth-shaped needle results in a loose structure, the strength is reduced, and the quality is worse than before. why? They can't understand! I think the reason is that the pre-spun fiber layer is very thick, with a large pitch of R (6.3mm), three edges, and nine teeth distributed on the upper, middle and lower sides of the fiber layer. During the puncture process, the fibers can be entangled up and down, and a better puncture effect can be exerted; if a pitch of C (3.3 mm) is used, the 9 teeth are short and dense, and the upper part of the chemical fiber layer is punctured to the bottom surface of the lower layer. The hook tooth has a large stroke distance and does not have a good entanglement effect, especially the staple fiber, which often causes the fiber to break, so that the quality of the nonwoven fabric is adversely affected and the strength is worse.
Generally speaking, the pitch of the pre-needle should be R (6.3mm); the main pitch should be M (4.8mm) and C (3.3mm) thin non-woven fabric, preferably using fine teeth C (3.3mm) or F (1.3mm), but be sure to note that with a fine-toothed needle, the depth of the puncture must be appropriate, not too deep. Generally, the depth (movement) of the needle can make the first tooth out of the bottom surface of the cloth layer. It should not be too deep. If it is too deep, it will damage the fiber and damage the cloth layer. Generally, the distance from the tip to the first tooth plus the thickness of the finished product may be slightly exposed. Generally, the car roof cloth is produced, and the crown needle is used for raising, and the fluff is not dense enough. The thorn is deeper, but the fluff is gone. I think it is too deep, and it is so deep that the fluff is taken off the cloth. . The crown needle has a lancet depth (movement), which means that the hook teeth are separated from the bottom surface of the cloth by 1-1.5 mm. This has a layer of fluff.
Many examples show that the needle is very particular in its application.
2.2 The selection of synthetic leather base cloth synthetic leather base cloth, especially ultra-slim fiber synthetic leather base cloth, the selection of non-woven needle is very strict and elegant. General pre-needle needle No. 38, pitch R; main needle 40 tooth pitch M and C; face needle No. 42 hook tooth depth, tooth protrusion have strict requirements (omitted) in production practice, the same specifications of the needle, the previous one The tooth depth and odontoid of the Taiwan machine and the latter machine are different. Very particular about it.
The company has a special needle for synthetic leather fabrics. It is designed to integrate the successful experience of needles from various factories at home and abroad. In practical applications, it is well received by customers and replaces imported needles.
2.3 How to avoid damage to the fiber warp and weft with reinforcing mesh layer Mesh cloth, paper felt and other non-woven fabrics, there is a layer of reinforced base fabric in the middle, how to avoid cutting the warp and weft yarn of the base fabric is the key to quality. Needle selection is the key. The shape of the hook and the depth of the hook teeth are very particular and have very strict requirements. About industrial use?

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