Soundproof Sheet Manufacturing via Differential Fiber Coating Melting

The patent applies parameter changes by controlling the melting points of coating layers on different fibers. By selecting fibers with coating layers having specific melting points (first coating layer melts at lower temperature, second coating layer melts at higher temperature), the patent achieves precise control over internal structure formation during the heating process without requiring complex accumulation processes. The structured fiber body is formed by differential melting and bonding of coating layers at different temperature stages.

The patent implements preliminary action by pre-coating the fibers with thermoplastic materials before accumulation. The fibers are prepared in advance with coating layers that have predetermined melting characteristics, allowing the internal structure to be controlled during the heating process rather than requiring complex real-time control during material accumulation. This preliminary preparation simplifies the manufacturing process while maintaining precision.

The patent uses parameter changes related to temperature to control the internal structure formation. By heating the fiber accumulated body to different temperature stages (first temperature to melt first coating layer, second temperature to melt second coating layer), the patent achieves precise internal structure control in a relatively short time without requiring slow, gradual material accumulation. The differential melting points enable rapid structural organization.

The patent exploits phase transitions of the thermoplastic coating layers (solid to liquid at specific melting points) to control internal structure formation. When heated to the melting point of the first coating layer, it transitions to liquid state and bonds fibers together, forming a structured arrangement. This phase transition mechanism enables rapid structure control compared to gradual accumulation methods.

The patent applies local quality by creating different material compositions at different locations within the soundproofing sheet. The first and second fibers with different coating layers are distributed throughout the fiber accumulated body, and during heating, these different materials melt at different temperatures and locations, creating a structured internal arrangement with varying density and composition in different regions, thereby improving soundproofing characteristics.

The patent uses parameter changes (temperature) to achieve different material distributions within the sheet. By controlling the heating temperature to melt specific coating layers at different stages, the patent creates a structured internal composition with varying material content in different regions, improving soundproofing performance without requiring complex manufacturing processes.