NINGBO INNO PHARMCHEM CO.,LTD. is a leading provider of high-quality chemical raw materials, and Polyvinyl Alcohol (PVA) is one of our flagship products. In the demanding world of textile manufacturing, PVA plays an indispensable role, particularly in the critical process of warp sizing. This article will delve into the specific requirements and benefits of using PVA as a textile auxiliary agent, focusing on its application in warp sizing and stiffening finishing.

Warp sizing is a fundamental process aimed at preparing yarns for weaving. The primary goal is to enhance the yarn's strength to withstand the tension and abrasion encountered during high-speed weaving. Additionally, sizing reduces yarn hairiness, minimizing breakages and ensuring smoother processing. A key requirement for a sizing agent is that it must be easily removable after weaving, a process known as desizing. Polyvinyl Alcohol excels in meeting these requirements due to its excellent film-forming ability and water solubility. The choice of PVA grade, specifically its alcoholysis degree (AD) and polymerization degree (DP), is crucial for optimal performance.

For sizing cotton yarns, especially in high-density weaving applications, a high-alcoholysis PVA (≥99% AD) with a high polymerization degree (e.g., PVA-1799, DP 1700-1800) is recommended. This grade provides superior film strength, creating a robust protective layer around the yarn. For synthetic fibers like polyester and nylon, or for blends, a partial-alcoholysis PVA (~88% AD) is often preferred. Lower DP grades of partial-alcoholysis PVA (e.g., PVA-0588, DP 500-600) offer easier dissolution, typically in warm water, and a more flexible film, which is advantageous for delicate fibers and easier desizing.

Beyond sizing, PVA is also utilized in stiffening finishes for fabrics. The requirement here depends on the desired outcome: permanent or temporary stiffness. High-alcoholysis PVA with high DP can impart permanent crispness, ideal for formalwear or industrial fabrics. Partial-alcoholysis PVA, on the other hand, provides temporary or softer stiffness, suitable for lightweight apparel. The selection of the correct PVA grade ensures that textile manufacturers can achieve the desired fabric handle, enhance weaving efficiency, and meet the specific finishing requirements of their products. NINGBO INNO PHARMCHEM CO.,LTD. offers a comprehensive range of PVA grades to meet these diverse textile needs, ensuring quality and performance for our clients.