During the wet forming process of Spunlace Nonwoven Fabric (wet-laid nonwoven fabric), it is very important to control the uniform distribution of the fiber mixture to achieve stable nonwoven fabric structure and thickness. Here are some key steps and controls:
Raw material preparation and preprocessing:
Select fiber raw materials with uniform quality and suitable length, and perform necessary pre-processing, such as cleaning, drying and cutting, to ensure fiber consistency and processability.
Fiber mixing and dispersion:
Use appropriate mixing equipment to mix different fiber raw materials evenly to avoid aggregation and separation of fibers.
Through mechanical stirring, air dispersion and other methods, ensure that the fibers are fully dispersed during the mixing process to form a uniform fiber mixture.
Preparation and adjustment of suspension:
Mix the fiber mixture with water and other additives to prepare a uniform fiber suspension.
Adjust the concentration, viscosity and fluidity of the suspension as needed to ensure that the fibers are evenly distributed in the suspension.
Forming and dehydration:
In the forming machine, the suspension is converted into a wet web through specific forming wires.
Control the speed and tension of the forming web to ensure even fiber deposition on the wet web.
Use methods such as pressure extrusion, centrifugation or vacuum moisture absorption for dehydration to remove excess moisture and ensure the uniformity and stability of the fiber web.
Detection and adjustment of fiber distribution uniformity:
During the production process, the uniformity of fiber distribution is regularly checked.
Use appropriate detection methods, such as optical microscope observation, image analysis, etc., to evaluate the uniformity of fiber distribution.
According to the test results, the raw material mixing ratio, suspension preparation parameters or molding process parameters are adjusted in time to improve the uniformity of fiber distribution.
Drying and consolidation:
During the drying process, hot air or infrared heating is used to evaporate the water in the fiber web and enhance the bonding force between fibers.
Through reinforcement processes such as hot rolling, the density and uniformity of non-woven fabrics can be further improved.
Post-processing and inspection:
Post-processing as required, such as coating, printing, embossing or cutting to specific sizes.
Conduct quality inspections on finished products, including thickness, density, uniformity and other indicators to ensure that products meet standard requirements.
In short, during the molding process of wet-laid non-woven fabrics, by strictly controlling key steps such as raw material preparation, fiber mixing and dispersion, suspension preparation and adjustment, molding and dehydration, the uniform distribution of the fiber mixture can be effectively controlled, thereby achieving stable Nonwoven construction and thickness. At the same time, regular testing and adjustment of the uniformity of fiber distribution is also an important means to ensure stable product quality.