As the part that directly contacts the skin, the surface layer is the first level of panty-shape diaper quality. How to produce qualified products, we must first start with this main structure. Whether the surface layer can play its own role is closely related to the materials used by the producer. Let's briefly talk about materials and related requirements.

Brief introduction of panty-shape diaperlayer

Baby diapers, diapers, women's sanitary napkins, women's sanitary pads, and adult incontinence products have similar main structures, including the following main structures: coating, liquid storage layer, and isolation layer. The main function is as a separation and filter material, when the liquid is discharged, the liquid can smoothly enter the absorbent core through this layer of fabric. Therefore, this nonwoven must be somewhat hydrophilic and non-absorbent, and have enough pores to allow liquids to pass smoothly and into other transfer layers under the surface layer. Therefore, it is particularly important to improve and improve the performance and quality of the parts in direct contact with the human body.

General requirements for panty-shape diaperlayer nonwovens

The main requirements are: have a certain strength, the vertical and horizontal strength is less than that; good water permeability enables the liquid to quickly enter the absorbent pad; low humidity, keeping the skin dry, that is, the liquid is not easy to return from the absorbent pad to the surface of the human body, making the skin feel dry and comfortable, Low moisture regain; no peculiar smell, uniform appearance, white, in line with hygiene requirements; soft, breathable and comfortable; soft to the touch, smooth and plump surface, small fiber fineness; no allergy, itching and toxicity to human skin; keep the skin clean, after the test Total pilling mass is 3.0mg; no noise when used and folded.

The direct contact of the surface layer with the skin is the beginning of the panty-shape diaper liquid absorption, but in fact the liquid absorption is almost zero, only guiding the urine into the core layer. It is closely related to the raw material, thickness and structure of nonwovens. From the molecular point of view, there are three main forms: 1. The fibers directly absorb water molecules; 2. The capillaries between fibers; 3. The water presses the water molecules through the fabric gap. Due to the requirement to keep dry, hydrophobic fibers with low hygroscopicity are usually selected, ie, the first form of water absorption such as cotton fibers is excluded. Binder fibers are generally not used as surface layer materials (but can be used for women's daily pads), and Section 2.3 is the main form of water permeability. In the past few years, polypropylene nonwovens have the highest utilization rate of panty-shape diaper materials, mainly because polypropylene fibers are hydrophobic. The acrylic non-woven fabric can quickly penetrate the panty-shape diaper layer into the diversion layer through the treatment of the hydrophilic surfactant, but the hydrophilicity also increases after the surfactant treatment. When the panty-shape diaper is under pressure, urine is prone to reverse osmosis, which affects the dryness of the surface.

At present, the surface material mainly adopts hot air nonwovens, and the developed surfactant can also balance the requirements of liquid rapid penetration and low reverse osmosis. However, with the upgrading of technology, there will be new requirements and challenges, which requires the panty-shape diaper industry personnel to have the determination to break through and the perseverance to face difficulties.