How can hot air permeable fabrics precisely control the pore structure to achieve dual optimization of breathability and barrier properties of diaper bottom sheets?

The core advantage of hot air permeable fabrics lies in the precise control of their pore structure. This control is not only reflected at the macro level, that is, the overall air permeability of the fabric, but also goes deep into the micro level, focusing on the shape, size and distribution of individual pores. Through advanced production technology and processes, hot air permeable fabrics can accurately control the arrangement and bonding of fibers to form fabrics with specific pore structures.
Macro-level air permeability control: At the macro level, the air permeability of hot air permeable fabrics mainly depends on their porosity and pore size. Porosity refers to the proportion of pores in the fabric, while pore size determines the difficulty of air circulation. By adjusting the parameters of hot air treatment, such as temperature, wind speed and time, the degree of curing and shrinkage of the fibers can be precisely controlled, thereby affecting the porosity and pore size. Higher porosity and moderately sized pores are conducive to the free circulation of air and improve the overall air permeability of the fabric.
Pore ​​structure regulation at the micro level: At the micro level, the pore structure regulation of hot air permeable fabric is more complicated. The shape, size and distribution of individual pores have an important influence on the air permeability and urine barrier properties of the fabric. By selecting different types of fibers for blending and adjusting the diameter and length of the fibers, a fiber mesh with a specific pore structure can be formed. During the hot air treatment process, the bonding mode and degree between fibers will also affect the shape and distribution of the pores. For example, finer fibers can form a denser fiber mesh, which is conducive to enhancing urine barrier properties; while appropriately thickening the fibers can increase pores and improve air permeability while maintaining urine barrier properties.

Hot air permeable fabrics have successfully achieved a balance between air permeability and urine barrier properties by optimizing the pore structure. The realization of this balance depends on the precise control of pore size, shape and distribution.
Relationship between pore size and air permeability: Pore size is one of the key factors affecting the air permeability of fabrics. Larger pores are conducive to the free flow of air and improve breathability; however, overly large pores may also cause urine leakage and reduce urine barrier properties. Therefore, hot air permeable fabrics ensure that breathability is met without sacrificing urine barrier properties by finely controlling the pore size. By adjusting the parameters of hot air treatment and the arrangement of fibers, a pore structure with moderate size and uniform distribution can be formed, which not only ensures the free flow of air, but also effectively blocks urine leakage.
Relationship between pore shape and urine barrier properties: Pore shape also has an important influence on urine barrier properties. Circular or elliptical pores are more conducive to the uniform distribution and rapid absorption of urine, reducing the accumulation and leakage risk of urine on the surface of the fabric. Irregularly shaped pores may cause urine to form channels inside the fabric, increasing the possibility of leakage. Therefore, in the regulation of pore structure, hot air permeable fabrics focus on forming pores with regular shapes and uniform distribution to enhance urine barrier properties.
The relationship between pore distribution and air permeability uniformity: The uniformity of pore distribution is crucial to the air permeability uniformity of the fabric. Uniform pore distribution can ensure the free flow of air on the surface of the fabric, reduce local moisture accumulation, and keep the baby's skin dry and comfortable. Uneven pore distribution may lead to a decrease in local air permeability and increase the risk of skin problems such as diaper rash. Therefore, during the production process, hot air permeable fabrics focus on forming fabrics with uniform pore distribution and consistent air permeability to meet the high requirements of the high-end diaper market for air permeability uniformity.

Hot air permeable fabrics achieve dual optimization of air permeability and urine barrier properties by finely controlling the pore structure, showing unique advantages in the application of diaper bottom sheets.
Improve the dryness and comfort of baby's skin: The air permeability design of hot air permeable fabrics effectively reduces the accumulation of moisture on the surface of the fabric and keeps the baby's skin dry and comfortable. This dry environment helps reduce the occurrence of skin problems such as diaper rash and improve the baby's comfort and health level.
Enhance urine barrier and reduce leakage risk: By optimizing the pore structure and shape, the hot air permeable cloth significantly enhances the urine barrier while ensuring breathability. This design not only improves the absorption efficiency of diapers, but also reduces the risk of urine leakage, providing more reliable protection for babies.
Meet the needs of the high-end market and enhance product competitiveness: As consumers' requirements for infant care products continue to increase, the high-end diaper market has higher and higher requirements for breathability and urine barrier. Hot air permeable cloth achieves dual optimization of breathability and urine barrier by precisely controlling the pore structure, meeting the needs of the high-end market and enhancing the competitiveness of products.
Environmental protection and sustainability: The production process of hot air permeable cloth is relatively environmentally friendly, reducing the use of chemical solvents, and is in line with modern consumers' pursuit of green and healthy products. With the improvement of environmental awareness, hot air permeable cloth made of renewable or biodegradable fibers is gradually becoming the development trend of diaper bottom film materials in the future.