Polyester nonwoven interlining Series 0

Industry Knowledge

How to balance the need for softness and strength when designing polyester nonwoven interlinings?

Balancing the need for softness and strength is a key challenge when designing polyester nonwoven interlinings. Here are some strategies and methods to achieve this balance:
The specifications of polyester fibers need to be carefully selected. Finer fiber diameters generally result in a softer feel because fine fibers can form a finer surface and more micropores, increasing air permeability and moisture permeability. However, too fine fibers may affect the strength of the nonwoven fabric, so a balance needs to be found in fiber diameter.
Adjusting the distribution density of the fibers is also key. Properly increasing the distribution density of the fibers can increase the strength of the nonwoven fabric, but at the same time it may increase its stiffness and affect the feel. Therefore, it is necessary to find the optimal distribution density that can maintain sufficient strength and a soft feel through experiments and tests.
The use of advanced production processes and technologies is also an important means to achieve a balance. For example, the use of advanced fiber interlacing or combining technologies can make the surface of the nonwoven fabric softer and more comfortable without sacrificing strength. At the same time, optimizing production process parameters such as temperature, pressure and time can also have a positive impact on the performance of nonwoven fabrics.
Conducting adequate performance testing and evaluation is a key step to ensure that the balance is achieved. Through standardized test methods, the softness and strength of nonwoven fabrics are comprehensively evaluated, and adjustments and optimizations are made based on the evaluation results.
Balancing the softness and strength requirements of polyester nonwoven interlinings requires comprehensive consideration of fiber specifications, distribution density, production processes and performance testing. Through sophisticated design and scientific testing, high-quality nonwoven interlining products that meet strength requirements and have a good feel can be produced.

What impact does the change in distribution density have on the air permeability and moisture permeability of polyester non-woven fabrics?

Changes in distribution density have a significant impact on the air permeability and moisture permeability of polyester non-woven fabrics.
Effect of breathability
Changes in pore structure: The breathability of polyester non-woven fabrics mainly depends on its internal pore structure. When the distribution density increases, the number of fibers per unit area increases and the pores between fibers become smaller, resulting in a narrower path for gas molecules through the fabric and an increase in air permeability resistance, thus reducing the air permeability of the non-woven fabric. On the contrary, when the distribution density decreases, the pores increase and the air permeability improves.
Tightness of fiber interweaving: High distribution density means that the fibers are more tightly intertwined, which will also hinder the passage of gas molecules and reduce breathability. The lower distribution density makes the interweaving between fibers looser, which is conducive to the flow of gas molecules.
Effect of moisture permeability
Moisture transfer path: The moisture permeability of polyester non-woven fabrics refers to the ability of moisture to pass through the fabric in the form of vapor. Changes in distribution density also affect the path of moisture transfer. In high-density non-woven fabrics, the pores between fibers are smaller and may be blocked by contact points between fibers, limiting the transmission path of moisture vapor and reducing moisture permeability. Low-density non-woven fabrics provide more moisture transfer channels, which is beneficial to improving moisture permeability.
Fiber hygroscopicity: Although polyester fiber itself has relatively poor hygroscopicity, changes in distribution density will still affect the overall moisture absorption and moisture permeability of the fabric. In high-density non-woven fabrics, the tight interweaving between fibers may limit the absorption and diffusion of moisture by the fibers to a certain extent, while low-density non-woven fabrics may be more conducive to the rapid absorption and transfer of moisture.
Changes in distribution density have a direct and significant impact on the air permeability and moisture permeability of polyester non-woven fabrics. During the design and production process, the appropriate distribution density needs to be selected based on specific application requirements to balance the requirements of air permeability and moisture permeability.