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Are hot-rolled non-woven fabrics and hot-air non-woven fabrics one thing? Are they referring to a product?

by:Sunshine     2021-03-04
Study: Published: 2019-12-06 07:37:00 Hits: 1764 belongs to a non-woven hot air bonding (hot-rolled, hot-air) non-woven fabric. Hot-air non-woven fabric is a non-woven fabric produced by combing fibers and using hot air on drying equipment to penetrate the fiber web and heat it. Hot air bonding refers to the use of hot air on drying equipment to produce thermal fusion bonding through the fiber web. Different heating methods have different product performance and style. Generally, hot-air bonded products have the characteristics of fluffy, soft, good flexibility, and strong warmth retention, but they are low in strength and easy to deform. Non-woven fabric and hot air non-woven fabric' styleu003d'box-sizing: content-box; border: 0px; vertical-align: middle; max-width:; margin: 0px auto; width: 614px; height: 411px;'/ u003e Hot air adheres to most fiber webs by mixing a certain proportion of low-melting adhesive fibers or using two fiber components, or the powder device applies a certain amount of fiber glue powder in the fiber web before entering the oven. The melting point of the powder is lower than the melting point of the fiber, and it melts rapidly when heated, resulting in adhesion between the fibers. The heating temperature of hot air bonding is generally lower than the melting point of the main fiber. Therefore, in the selection of fibers, the matching of the thermal properties of the main fiber and the binder fiber should be considered to make the gap between the melting point of the binder fiber and the melting point of the main fiber large. Reduce the thermal shrinkage of the main fiber as much as possible and maintain the original performance of the fiber. The strength of the binder fiber is lower than that of the ordinary fiber, so the addition amount should not be too large, and it is generally controlled at 15% to 50%. Due to its small thermal shrinkage, bicomponent fibers are very suitable for use alone or as bonding fibers for the production of hot-air bonded non-woven fabrics to form a good point bonding structure. The products produced by this method have high strength and softness. Thermal bonding can be used to reinforce fiber webs composed of thermoplastic synthetic fibers, such as polyester, polypropylene, etc., which are commonly used in the production of non-woven fabrics. Since cotton, wool, hemp, viscose and other fibers do not have thermoplasticity, the fine net formed by such fibers alone cannot be reinforced with thermal gel. However, a small amount of cotton, wool and other fibers can be added to the thermoplastic fiber web to improve some properties of the non-woven fabric, but generally not more than 50%. For example, a hot-rolled bonded non-woven fabric made of cotton/polyester with a mixing ratio of 30/70 can significantly improve moisture absorption, feel and softness, and is very suitable for medical and health care products. The strength of the non-woven fabric decreases as the content of cotton fiber increases. Of course, for a complete non-thermoplastic fiber network, powder thermal bonding reinforcement can also be considered. The thermally bonded nonwoven fabric can be heated in different ways. The bonding method and process, fiber type and carding process, and fiber web structure will ultimately affect the performance and appearance of the nonwoven fabric. For fiber webs with low melting point or bicomponent fibers, hot roll bonding or hot air bonding can be used. For ordinary thermoplastic fibers and their blends with non-thermoplastic fiber webs, hot rolling bonding can be used. The hot-rolling bonding method is generally suitable for thin products with a fiber web basis weight in the range of 20~200g/m, and is most suitable for thin products with a fiber web basis weight in the range of 20~80g/m. The fiber web is too thick and the intermediate layer with poor adhesion is easy. Produce stratification. Hot air bonding is suitable for quantitative products of 16~2500g/m. In recent years, the development of thin hot-air bonded nonwovens has been rapid. In addition, thermal bonding is also commonly used in the production of composite non-woven fabrics (such as melt-laminated non-woven fabrics), or as a supplement to other reinforcement methods. For example, mixing a small amount of fibers with a low melting point into the fiber web can significantly improve the strength and dimensional stability of the needle punched product after being strengthened by hot air bonding. The hot air adhesive product has the characteristics of high swelling pressure, good elasticity, soft touch, strong heat preservation, and good air permeability, but its strength is low and it is easy to deform. With the development of the market, hot-air bonded non-woven products are widely used to manufacture unique style disposable products, such as baby diapers, adult incontinence pads, feminine hygiene materials and napkins, bath towels, disposable tablecloths, etc. Thick used in the production of winter clothing, bedding, baby sleeping bags, mattresses, sofa cushions. High-density hot-melt adhesive products can be used to produce filter materials, sound insulation materials, and damping materials. Related tags: Previous: Take you to understand the difference in the name of the North and South, why are the southern customers called non-woven? 【Illustration】
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