Fastener Chain Warp Weft Fiber Configuration

The patent applies local quality by using flame retardant polyester fiber only in the warp direction where flame retardancy is most critical, while using high-strength synthetic fiber in the weft direction where tensile strength is needed to compensate for the weaker flame retardant fiber. This spatial differentiation of material properties resolves the contradiction between flame retardancy and tensile strength.

The patent creates a composite fastener tape structure combining two different fiber types: flame retardant polyester fiber in the warp and high-strength synthetic fiber in the weft. This composite approach allows the tape to simultaneously achieve both flame retardancy (from the polyester) and high tensile strength (from the synthetic fiber), directly resolving the technical contradiction.

The patent reduces manufacturing cost by applying flame retardant properties only locally where most needed (in the warp fiber direction), rather than treating the entire fastener tape uniformly. This localized approach achieves sufficient flame retardancy while reducing the amount of expensive flame retardant material required.

The patent optimizes the phosphorus content parameter within a specific range (3000-20000 ppm) to achieve effective flame retardancy while controlling material costs. By precisely controlling this chemical parameter, the patent balances performance requirements with manufacturing cost considerations.

The patent incorporates phosphorus into the polyester fiber structure during the fiber manufacturing process itself, before the fastener tape is produced. This preliminary incorporation ensures the flame retardant property is inherently built into the fiber and will not be easily removed or degraded by subsequent dry cleaning processes, thus maintaining both flame retardancy and durability.

The composite structure with flame retardant polyester fiber in the warp provides inherent flame protection that is integrated into the fiber structure itself, making it resistant to degradation from dry cleaning. The high-strength synthetic fiber in the weft provides structural stability that protects the flame retardant fibers during repeated cleaning cycles.

The patent changes the approach from applying flame retardant through dye (which causes uniformity issues) to incorporating phosphorus directly into the polyester fiber during manufacturing. This parameter change in the method of flame retardant incorporation eliminates the dyeing uniformity problem while maintaining effective flame retardancy.

The flame retardant phosphorus is incorporated into the polyester fiber during the fiber production process, before the fastener tape is manufactured and before any dyeing occurs. This preliminary incorporation of the flame retardant property avoids the need for flame-retardant-containing dyes and the associated uniformity problems entirely.