Introduction

● Wet-laid nonwoven fabric is a revolutionary new material that is gradually becoming a favorite in the manufacturing industry due to its unique production process and wide range of applications.

● Compared with traditional textile materials, the production of wet-laid nonwoven fabric is not only efficient but also more environmentally friendly, converting fibers directly into fabric without complex weaving processes.

1. Raw Material Selection and Preparation

● The first step in manufacturing wet-laid nonwoven fabric is the selection and preparation of raw materials.

● The quality of the raw materials directly affects the performance and application of the final product.

● Common raw materials include natural fibers such as wood pulp and cotton pulp, as well as synthetic fibers like polypropylene and polyester.

● These raw materials undergo meticulous screening to ensure purity and consistency, laying a solid foundation for subsequent production processes.

2. Fiber Pretreatment

● Pretreatment is crucial for ensuring uniform fiber distribution in subsequent processes.

● It involves opening, comminuting, and purifying the fibers to remove impurities and uneven fiber bundles.

● Specific chemical additives, such as dispersants, wetting agents, and stabilizers, may be added to improve fiber dispersion and suspension stability.

3. Suspension Preparation and Adjustment

● Suspension preparation is the core step in wet-laid nonwoven fabric production.

● Pretreated fibers are mixed with water to form a uniform fiber suspension.

● The concentration, viscosity, and pH value of the suspension must be precisely controlled to ensure uniform fiber distribution and fabric formation.

● Adjustments are made to the suspension to achieve optimal forming conditions.

4. Forming and Dewatering

● The forming process converts the suspension into wet-laid nonwoven fabric.

● In the forming machine, the suspension is mechanically intercepted by a specific forming net, and fibers deposit on the net to form a wet web.

● The wet web undergoes dewatering to remove excess water through methods such as pressure squeezing, centrifugation, or vacuum suction.

5. Drying and Reinforcement

● The drying process ensures that the nonwoven fabric achieves sufficient strength.

● The wet web passes through a dryer where hot air or infrared heating evaporates the moisture in the fiber web, enhancing fiber bonding.

● The nonwoven fabric is then reinforced through a hot-rolling process, which causes melting and bonding between fibers to form a sturdy structure.

6. Post-processing and Inspection

● After hot-rolling reinforcement, the nonwoven fabric may undergo post-processing such as coating, printing, embossing, or cutting to specific sizes to meet various application requirements.

● Each batch of nonwoven fabric undergoes rigorous quality inspection, including tests on thickness, density, strength, and breathability, to ensure compliance with performance standards and quality requirements.

7. Packaging and Storage

● Inspected and qualified nonwoven fabric is neatly rolled and packaged for easy transportation and storage.

● Special attention is paid to packaging materials and methods to prevent damage to the nonwoven fabric during transportation and storage.

The manufacturing process of wet-laid nonwoven fabric involves a series of precise and complex steps, each having a significant impact on the performance and quality of the final product.

With technological advancements and growing market demand, production techniques for wet-laid nonwoven fabric are continuously innovating and developing to meet the needs of various industries and consumers.