Author：Baby & Adult Diaper Materials FROM：Diaper Materials Manufacturer TIME：2023-03-07
China has entered the WTO, the big family of international trade. With the opening and expansion of the market, the fierceness of market competition will be further deepened. In order to ensure that enterprises can have strong competitiveness and vigorous vitality in this open competitive environment, so that the profitability of enterprises can be effectively guaranteed, product development and innovation have become one of the indispensable ways.
At present, Non breathable PE film backsheet has been fully and widely used in the field of personal hygiene care products, especially women's sanitary napkins and panty liners. However, with the development of the economy and the improvement of consumers' living standards, the grade and requirements for such personal hygiene products will gradually increase. At the same time, from the point of view of the product life cycle theory, any product has a specific life span and will be replaced by newer and better products of the same or different types. The composite material of embossed film and non-woven fabric will be one of the development directions.
Non-woven fabrics can be divided into hot-rolled non-woven fabrics, hot-air non-woven fabrics, spunlace and needle-punched non-woven fabrics, spunbonded melt-blown non-woven fabrics, and chemically bonded non-woven fabrics according to their raw material fibers and processing technology. Various types of non-woven fabrics have different applicability due to large differences in performance.
Among them, hot-rolled, hot-air and chemically bonded non-woven fabrics belong to the category of short fibers, and their mechanical strength is lower than that of long-fiber non-woven fabrics such as spunbond and spunlace non-woven fabrics. Although spunbonded nonwoven fabrics have high vertical and horizontal strength and small vertical and horizontal differences, they have poor hand feeling and burr feeling, and are not suitable for direct contact with human skin.
2. Selection of composite process
The common dry lamination method needs to apply a layer of adhesive on the film substrate by transfer method or direct coating method. In order to adapt to production, the adhesive usually contains water-based solvents or other organic solvents, and it needs to be dried at high temperature for a certain period of time during molding. However, the temperature resistance of Non breathable PE film backsheet is generally not very good, which will cause shrinkage, curling or melting, especially for breathable films. Therefore, the common dry lamination method is applied to embossed films. When compounding with non-woven fabrics, there are great limitations.
Generally speaking, there are three main methods suitable for composite processing of cast film and non-woven fabric: non-woven fabric on-line mixed pressure method, hot-sol spraying method and EVA hot-melt transfer method.
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