The surface materials of diapers, sanitary napkins and pads are in direct contact with human skin, and various properties directly affect consumers' evaluation of products. Some enterprises are committed to developing new surface materials such as pearl fiber cushion and silk nonwovens. Due to the long penetration time, ordinary silk / viscose nonwovens have not been widely used. However, with the efforts of R & D personnel, a silk / es nonwoven diaper layer material has been developed, which has short water permeability time, low reverse permeability and comfort performance, and meets the requirements of ordinary surface materials. Let's see if it can cater to the market.
There are two reasons why silk/adhesive nonwovens have excessive liquid penetration times. First, the fiber fineness is small, and the spunlace carding process produces a lot of fluff on the surface of the non-woven fabric, which increases the surface gap of the non-woven fabric and reduces the surface tension of the woven fabric; second, the surface tension of the fiber is too small and does not have wettability.
After hydrophilic finishing of this nonwoven with TF629, the liquid breakthrough time was significantly reduced. However, the effect of the hydrophilic agent increases the water absorption capacity of the binder fibers, greatly increasing the amount of reverse osmosis, reaching more than 9g, which affects the dryness of the non-woven fabric. As the material of diapers surface layer, silk fiber should not be mixed with fibers with strong water absorption.
The higher the density of this nonwoven fabric, the greater the thickness, the less air permeability and the greater the reverse osmosis. With the increase of the number of spunlaces, the thickness decreases, the elongation at break increases, the air permeability decreases, and the liquid penetration time decreases; with the increase of the number of spunlaces, the breaking strength first increases and then decreases. When the number of spunlace is 5, a peak appears; with the increase of oil rate, the liquid breakthrough time and the amount of reverse osmosis decrease.
To sum up, this new type of silk/ES non-woven fabric can meet the relevant standard requirements, and its practicability and comfort are not much different from those of ordinary diapers surface materials, such as ES hot air non-woven fabric, and more healthy.
As far as the current technology level is concerned, the development prospect of this technologydiapers is considerable. For follow-up researchers, research can be carried out from the following aspects.
(1) Improve the pilling resistance of the silk/ES nonwoven surface.
(2) Increase the bulkiness of ES hot air nonwovens, enhance the entanglement between ES fibers and silk fiber layers, and improve peel strength.
(3) Reduce the carding difficulty of silk fibers, fiber carding damage, and the vertical and horizontal breaking strength ratio of silk/ES nonwovens.
(4) To study the properties of silk/ES nonwovens with convex and concave structure.
Conclusion: The consumption power of consumers is increasing day by day, the demand for daily necessities is increasing, and the requirements for the functionality and practicability of products are also getting higher and higher. diapers has the characteristics of light weight, many patterns, short water penetration time and good dryness, which can meet the needs of high-end customers. With the continuous progress of carding technology and spunlace production technology, a breakthrough will be made in the production process difficulty of non-woven materials. As a high-end product with a specific consumer group, the silk-thick spunlace nonwoven material has a very broad development prospect as long as manufacturers and enterprises work together to develop the market.