Standard Classification Mechanics for Raw Dew Retted Flax Straw
Classification of raw dew retted flax straw relies on stalk morphology, moisture limits, and chemical pectin degradation to predict mechanical scutching yields.
Moisture Content Loss on Drying
Gravimetric Analysis
Fibre moisture determination is a standard laboratory test used to establish the dry weight of raw textile materials. The measurement of moisture content loss on drying involves heating a sample of flax fibre in an oven at a specific temperature until it reaches a constant weight. By comparing the initial mass to the dry mass, technicians calculate the percentage of water held within the plant structure.
This value is recorded on the laboratory test certificate before the batch is released for spinning. The test prevents the processing of wet fibre, which can cause severe drafting problems and drafting roller slippage during the wet-spinning process.
Storage Condition
Flax fibres are highly hygroscopic and absorb water from the surrounding atmosphere. High moisture content loss on drying readings indicate that the raw fibre has been stored in damp conditions, which can lead to fungal growth and fibre decay. Control of storage humidity is therefore necessary to protect the material from degradation during transit.
Commercial Weight
Commercial transactions of flax fibres require a standardized moisture regain value to ensure fair pricing. Since buyers do not want to pay for excess water, moisture content loss on drying is used to adjust the invoice weight to a standard moisture level. This adjustment prevents disputes between the supply mill and the spinning factory by establishing a clear basis for the transaction.