The structure of diapers is usually composed of the surface layer, the diversion layer, the absorbing core and the back layer, among which, the surface material as a material in direct contact with the human skin, it needs to have good comfort and functionality, has excellent moisture absorption, does not store water, can quickly absorb the liquid and introduce the liquid into the following diversion layer or absorption core, and can prevent the liquid from regurgitating to the surface layer of the diaper to a certain extent, and keep the surface of the human skin dry.
This function is not only influenced by the properties of the absorbing core, but is also closely related to the properties of the surface layer, such as the design of 3D structures, perforation, or the unilateral wetting of the surface material.
1. 3D three-dimensional structure
The 3D three-dimensional structure can reduce the contact area between the human skin and the surface layer of the diaper, increase the softness and breathability of the surface layer, in addition to accelerating the infiltration of the liquid and realizing the rapid diversion of urine.
Generally, the non-woven fabric for the surface layer of diapers with 3D three-dimensional embossing is first hot-rolled by embossing rollers with different shapes and protrusions in the hot rolling process, and then cooled and shaped. And the bump part in contact with the human body is generally treated with a fluorine-free waterproof agent (Texnology®M380) or (Texnology®FCB016) for water-repellent finishing, so that this part can maintain good dryness and improve the comfort of the material.
2. Punching
Punching can not only increase the breathability of the diaper surface, but also allow the liquid to be quickly channeled through the hole to the absorbent layer, reducing the contact time of urine with the skin. At present, there are two main types of mesh materials used in sanitary materials: microporous membrane and non-woven mesh material.
At this stage, the perforated surface layer for diapers is generally made of water-repellent materials. In order to make the liquid only penetrate downward from the hole and reduce the reverse osmosis to the surface layer to a certain extent, it is necessary to combine and use the water absorption and water retention properties of the core to set the hole into a funnel shape with a wide top and a narrow bottom, which can also help the material to inhibit liquid reverse osmosis.
3. Single-guide wet finishing
Unidirectional moisture conduction requires that moisture transport be unidirectional, i.e., moisture can only be transported spontaneously in the direction of thickness in the material, or from one side of the material to the other, but not in reverse. The unilateral moisture conduction of the surface layer of the diaper can greatly reduce the seepage of urine and improve the dryness of the product.
At present, there are two main preparation technologies for unidirectional moisture-conducting nonwoven materials: structural design and chemical treatment. The structural design is mainly to use the difference in capillary diameter or wettability to design a composite structure with a moisture conduction gradient, so as to achieve the function of unilateral moisture conduction.
Chemical treatment mainly includes plasma grafting, modification and finishing. Plasma grafting modification treatment is carried out by treating the fiber surface, so that the free energy of the fiber surface is increased or decreased, and the wettability of the fabric is changed.
Finishing is mainly through the use of non-woven hydrophilic agent and carbon six waterproofing agent, so that the hydrophilicity of the front and back of the fabric forms a large difference, so as to achieve the directional transmission of moisture, compared with the former, the finishing process is easy to operate, the processing cost is low, if the non-woven fabric itself has a certain hydrophilicity, the hydrophilic/hydrophobic double-sided structure of the surface material can be directly realized through the single-sided waterproofing process.
In the single-sided waterproof finishing of non-woven fabrics, Texnology® technicians use Texnology®FCB016 to compound it with thickener to make a waterproof slurry, and through the printing and low-temperature drying process, on the basis of not damaging the original properties of the non-woven fabric, the non-woven fabric is endowed with good water repellency on one side, so that the skin-friendly layer of the processed surface material absorbs moisture and the non-skin-friendly layer repels water, and has a certain unilateral moisture conduction function, and the process formula is as follows:
Craft: Printing process
Texnology®FCB016 六 水 :6%
Texnology®ZCD :1.5%
Front Empty Screen Printing Water Repellent → Drying & Baking (130°C×90s)
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