Boiling Water Shrinkage (BWS) is the percentage reduction in the length of a polyester filament after immersion in boiling water for a fixed period. It is calculated as: BWS (%) = (Original Length – Length After Boiling) / Original Length × 100% This indicator reflects the thermal setting level, molecular orientation, and dimensional stability of
In the textile and synthetic fiber industry, polyester fibers occupy an essential position due to their durability, stiffness, and other advantages. Titanium dioxide (TiO₂), a key additive in polyester production, plays a crucial role in shaping the melt’s properties, directly affecting fiber performance and applications. Today, we’ll dive deep into how this "invisible regulator" alters
In the chemical fiber industry, polyester chips (or melt) are the core raw material for producing polyester fibers. Their purity directly determines the quality of the final fiber products. Today, we will discuss one easily overlooked yet crucial indicator in polyester chips—iron content —and how it affects the quality of polyester fibers. 1. What Is
In the chemical fiber industry, polyester chips serve as the primary raw material for producing polyester fibers. Hidden within these chips, agglomerated particles may look insignificant at first glance, but they can easily become “invisible obstacles” in fiber manufacturing. Today, let’s break down this small yet critical issue to see how it impacts production and
In the polyester materials industry, blending and copolymerization are two common modification methods, each with distinct principles, processes, performance impacts, and application scenarios.
APET, PET, and PETG are three common polyester materials, and their differences are as follows: 1. Chemical Structure PET (Polyethylene Terephthalate): Polymerized from terephthalic acid and ethylene glycol. APET (Amorphous Polyethylene Terephthalate): A variant of PET with a more disordered molecular chain arrangement. PETG (Polyethylene Terephthalate Glycol): PET modified by introducing the 1,4-cyclohexanedimethanol (CHDM) comonomer. 2. Performance Characteristics
Q: Do you have low-melting PET Chips? The polymer must be semi-crystalline and not amorphous. A: Yes. We have bright-grade 180℃ and 230℃ low-melt polyester chips for yarn/fiber spinning. Q: We prefer the TM to be 180-205 degrees. Can your 180℃ LMP chip be used for POY yarn spinning, and the end usage is composite
How to Modify Polyester Fiber? Here are three main approaches: Chemical Modification, Physical Modification, and Process Modification.
There are mainly three methods to produce high IV PET chips. 1 Direct Polymerisation Method This method uses continuous polycondensation and direct esterification to produce an oligomer with a high degree of esterification. As the critical ratio of the carboxyl group increases, the reaction speed accelerates and the vacuum requirement decreases, making it easier to