Spunmelt nonwovens of additional functions and realization methods
The additional functions of spunmelt nonwovens refer to functions other than the basic functions. The basic functions of spunmelt nonwovens are determined by the characteristics of the raw materials used and the spinning process. For example, nonwovens made with hydrophobic PP raw materials are hydrophobic; nonwovens made with hydrophilic PET raw materials Woven fabrics are also hydrophilic. In practical applications, different application fields have different performance requirements for nonwoven products. Nonwovens used to make sanitary products require hydrophilic and antistatic properties; nonwovens used to make medical products require It has many functions such as water repellency, antistatic property, oil repellency, alcohol penetration and blood penetration. These functions are not inherent characteristics of the product, but additional functions realized through other processes.
The additional functions of nonwoven products often include hydrophilicity, water repellency, antistatic, anti-aging, antibacterial, anti-mildew, hemostasis, anti-itch, mothproof, flame retardant, fragrance, deodorization, oil repellent Alcohol penetration, blood resistance, flexibility, photocatalyst, radiation protection, etc. There are two commonly used technological measures to realize these additional functions: adding functional masterbatch to the raw materials for blending and spinning and finishing the product.
Add functional masterbatch to raw materials for blending spinning
This process uses the mixing device before the raw material is fed in the production line to add the corresponding functional masterbatch to the raw material in a predetermined proportion, so that the spinning melt has functional components, so that the product has the corresponding additional functions before it is consolidated into a cloth. the goal of. The advantage of this method is that the existing equipment of the production line can be used to achieve the purpose of the process, and it can be produced without adding any equipment. The process is simple, the processing cost is low, and the hygienic conditions of the product are guaranteed. The function of the product manufactured by this method can be Long-lived.
Not all additional functions can be achieved by adding functional masterbatch to the raw materials for blending spinning process, because the functional additives added to the melt may affect the normal spinning of the melt. For example, some functional masterbatch will affect the mechanical properties of the spun fiber; some functional masterbatch will also produce smoke or peculiar smell during the spinning process, which will pollute the production environment. At this time, the additional functions of the product need to be achieved through the process of finishing the product
after-finishing of textile product
After finishing the product, the surface of the non-woven fabric is finished after the web is consolidated into a fabric. According to the process of sorting, it can be divided into "online sorting" and "offline sorting". According to the specific process used, it can be divided into chemical reagent method and physical method
According to the sorting process
When using the "off-line finishing" process, it is necessary to configure a set of finishing system outside the nonwoven production line. The required equipment includes unwinding device, processing equipment, drying equipment, tension control equipment and winding machine, etc. .
According to the specific process method used
The chemical reagent method is to prepare the finishing agent into a solution according to a predetermined ratio, and then select the corresponding application method according to the viscosity of the solution to add the finishing agent to the surface of the product, and the product will have the corresponding function after drying and finishing. At present, the more common finishing agent application methods are spraying method, coating method, and dipping method.
The physical method is the use of physical methods to modify the surface of the product, such as the use of electrostatic electret to add electrostatic charge to the melt blown cloth to improve the filtration efficiency of the melt blown cloth.
The spunmelt nonwoven fabric after functional finishing can have the functions of water repellency, oil repellency, alcohol resistance, blood penetration, chemical resistance, hydrophilicity, antistatic, anti-aging, antibacterial, flame retardant, etc., functional finishing It has become an important means to improve the differentiation and added value of nonwoven products.