What role does resin viscosity play during the molding of WPC outdoor trash cans?

Resin viscosity serves as a fundamental parameter that dictates the entire manufacturing process and ultimate quality of Wood-Plastic Composite (WPC) outdoor trash cans. During injection molding or extrusion processes, optimal viscosity ensures proper material flow into complex mold cavities, complete fiber impregnation, and effective air bubble elimination. If viscosity is too high, the material struggles to fill thin-walled sections completely, potentially creating structural weaknesses and surface defects. Conversely, excessively low viscosity can lead to fiber segregation, where wood particles separate from the polymer matrix, compromising the composite's mechanical strength and weather resistance. Manufacturers carefully control resin viscosity through temperature regulation and additives to achieve uniform distribution of wood flour throughout the polymer, which directly impacts the trash can's durability against impact, moisture, and UV radiation. Proper viscosity management also minimizes production defects such as warping, sink marks, and incomplete filling, ensuring consistent product quality. Furthermore, it influences the surface finish quality, affecting both aesthetic appeal and cleanability. Ultimately, mastering resin viscosity parameters allows producers to optimize manufacturing efficiency while delivering WPC trash cans that withstand harsh outdoor conditions for extended periods.