Dehaired down Yield Estimation from Raw Cashmere Core Samples
Tube core sampling and laboratory card dehairing determine clean down yield, adjusting raw lot costs against moisture regain and industrial carding losses.
Down Cortex
Internal Structure
Internal structure components are measured against the standard morphology of fine down clusters to determine filling quality. Proteinaceous filaments form the central portion of the plumule branch in waterfowl plumage. The down cortex consists of spindle shaped cells packed with keratin that provide the structural integrity and elasticity of the fiber.
These cells are responsible for the loft and heat retention properties found in high quality insulation. Microscopic examination reveals the arrangement of these inner layers which differ significantly from feather structures.
Performance Attribute
Flexibility and resilience originate from the molecular arrangement within these protein layers. Within the down cortex, the interlocking keratin chains allow the material to compress and regain its original volume repeatedly. Mechanical durability ensures that sleeping bags and jackets maintain their thermal efficiency over many seasons.
A degraded inner core results in flattened clusters and poor fill power.
Chemical Stability
Natural oils protect the inner protein matrix from moisture and microbial degradation. Damage to the down cortex often occurs through harsh chemical cleaning or excessive heat during drying. Once the internal bonds are compromised, the plume loses its ability to trap air effectively.
Identification Method
Laboratory technicians use high magnification to distinguish between different species and grades of filling material. Analyzing the down cortex helps identify signs of overheating or chemical damage during the processing of raw plumage. Proper scouring at the mill preserves the structural health of these cells.
Manufacturers specify minimum fill power ratings to ensure the internal fiber structure meets the required thermal standards for the final product.