Personal care: Two-component ultra-fine products take on the important role
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Among personal care wipe products, the base material used in cosmetic and facial cleansing wipes is mainly spunlace man-made short fiber nonwoven fabrics. It is estimated that in the next five years, the production of wipes will pay more attention to the use of substrates with personalized characteristics, because the brand extension of many cosmetic wipe series products urgently requires breaking the gap caused by the use of general spunlace nonwoven substrates. The same market pattern. The two-component microfiber spunbond spunlace nonwoven wipes combine the advantages and technical advantages of spunbond nonwovens and spunlace nonwovens, and have undoubtedly become the dominant material for personal care wipes. .
Dalian Hualun Company and Jiangxi Ji’an Sanjiang Superfiber Nonwovens Company jointly developed my country’s first “two-component superfine fiber spunbond spunlace nonwovens” production line. The process flow of the method is: first place the PET and PA6 slices in two different drying towers to dry, then drop them straight into different screw extruders for melting, and then enter the melt filter for filtration. Then they are measured and transported to the spinning box by their respective metering pumps according to the process requirements. They are divided into 8 small streams by the component distribution plate, and the combined 8+8 small streams enter the spinneret and are ejected into fibers. Then after cooling and blowing and high-speed (5000m/min) airflow stretching, it enters the web laying machine to form a fiber web layer, which enters the hydroentanglement machine. After multiple passes of high-pressure hydroentanglement, the fibers are consolidated into cloth and the fibrils are cracked. It is formed into 16 monofilaments and becomes superfine fibers, which are dried and rolled into non-woven fabrics before leaving the factory.
It is worth noting that the fineness of laminated ultrafine fibers can reach 0.08dtex after hydroentangling, and the fiber specific surface area increases. After consolidation, a special three-dimensional station structure can be formed, and its fiber structure is denser. Better moisture absorption and breathability. At the same time, spunlace nonwovens overcome the shortcomings of spunbond nonwovens. Its cloth surface is flatter and cleaner, the product is softer, and its strength is far greater than that of short fiber nonwovens.
For spunbond spunlace nonwoven wipes, spunlace is a key process. Spunlace not only fully splits the orange petal-shaped short fibers into ultra-fine fibers, but also entangles them with each other under the action of high-pressure fine water jets, so that the fiber web can be reinforced and have certain physical and mechanical properties. The level of microfiber opening rate has a great influence on the performance of the product. If the fiber opening rate is high (more than 60%), the product will be soft, delicate, uniform and dense, and has high strength; if the fiber opening rate is low, it will not achieve the characteristics of ultrafine fibers. Therefore, the setting of spunlace process parameters is particularly important for fiber entanglement and fiber opening.
Research has found that in order to achieve good entanglement effects, it is key to select a reasonable water needle plate and optimize the water-entangling pressure ratio. If the pre-puncture pressure is set on the low side, it will greatly affect the final fiber entanglement and fiber opening effects; on the contrary, if the setting is on the high side, it will cause the fibers to open prematurely and form a denser layer on the surface of the product. fiber, which will weaken the effect of the second and third spunlace, causing the product to be “cooked rice”. In addition, corresponding modifications to the drafting machine, spunlace drum and mesh curtain will also optimize product quality, making the product more uniform, flat, smooth, soft, delicate and with less burrs. The pressure of the first spunlace is preferably set at 70% to 80% of the design value. The pressure of the second and third spunlaces is increased in sequence until the design value is reached, and the product effect is good. After spunlace fiberization, the moisture absorption performance of the microfiber is greatly improved. In addition, the dense structure of the microfiber spunlace cloth affects the heat penetration of the dryer, making the microfiber products more difficult to dry than ordinary polyester and nylon products. Therefore, the drying temperature setting of microfiber is 10°C to 15°C higher than that of ordinary polyester and nylon products with the same weight per square meter. ■Chen Shan (Zhejiang Sansan New Materials Co., Ltd.)
For personal care: Two-component ultra-fine products play an important role
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