Polypropylene is widely used in the melt-blown process due to its following advantages:1.Controllable polymer viscosity: Thermal degradation can be achieved by using oxidants or peroxides in the extrusion process, or through the mechanical shearing effect of the extruder, or by controlling the operating temperature, so as to adjust and control the melt viscosity as required.
Melt-blown technology is a crucial method for large-scale production of ultrafine fibers. Its principle is that polymer materials are extruded through spinnerets, and then further stretched under high-temperature and high-velocity airflows to form ultrafine fibers. The application of ultrafine fibers in melt-blown nonwovens is unparalleled by other products manufactured using a single nonwoven technology. Thanks to the availability of various raw materials that can be continuously used for melt-blowing, melt-blown nonwoven technology has developed rapidly, driving the growth of the melt-blown nonwoven industry.
Short-fiber geotextiles are generally more flexible in slope protection projects, facilitating construction and maintenance with minimal impact on the environment. They are usually applied in dike and waterway projects of large rivers and lakes where there is no wave load.
Today, we will popularize the classification of commonly used masks on the market and the composition of non-woven fabrics in masks. First of all, the commonly used masks on the market are divided into two major categories: flat masks and three-dimensional masks. Below, we will find two actual pictures to show you.
When it comes to flame-retardant nonwoven fabrics, many people are familiar with them. This is because with the development of the nonwoven fabric industry, nonwoven fabrics have become common products in our daily lives. For instance, the thermal insulation covers used in agricultural vegetable greenhouses are mainly made of needle-punched nonwoven fabrics. In winter, greenhouse insulation materials have shifted from straw to thermal insulation covers; however, these covers have a drawback: poor fire resistance. The emergence of flame-retardant nonwoven fabrics has effectively solved the fire hazard problem in vegetable greenhouses and general greenhouses. Below, I will explain the flame-retardant principle of flame-retardant nonwoven fabrics (Note: The original text contained a suspected typo "耐磨性燃烧原理，" which has been corrected to "flame-retardant principle" based on context). Compared with other nonwoven fabrics, flame-retardant nonwoven fabrics have higher high-temperature resistance, a higher melting point, and better sealing performance.
The impregnation method is one of the earliest manufacturing processes for nonwoven fabrics, and most early nonwoven products were produced using this method. Currently, this method is still used for producing some low-grade, low-cost products, such as various disposable finger wipes, adhesive interlining base fabrics for luggage linings, packaging materials, and agricultural thermal insulation materials.
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