Biodegradable Composite Screw for Rust-Free Non-Conductive Fastening

The patent applies composite materials by combining biodegradable plastic base material with natural fiber reinforcements (such as wood fiber, bamboo fiber, or plant fiber). This composite structure provides both the mechanical strength needed for screw functionality and the biodegradability required for environmental friendliness, resolving the contradiction between strength and environmental harm.

The patent changes the chemical composition parameters of the plastic material by using biodegradable polymers (such as PLA, PBAT, or PHB) instead of conventional non-biodegradable plastics. This parameter change enables the screw to maintain lightweight properties while gaining natural degradation capability through microbial action, thus resolving the contradiction between weight reduction and environmental pollution.

The patent merges multiple functions into a single material system by incorporating natural fibers directly into the biodegradable plastic matrix during the extrusion and molding process. This consolidation approach allows the screw to achieve both structural integrity and biodegradability through a unified manufacturing process, reducing overall manufacturing complexity despite the advanced material requirements.