Ventilation for Textile Mills

In textile production, ventilation has three separate jobs, and all three directly affect productivity: collecting fibre and fly from the air, providing the humidity yarn and fabric need to run properly, and removing the heat produced by the machines.

Fibre and fly

In spinning, combing, weaving and knitting areas, fibre is constantly released into the air. If it is not collected, it builds up on machines, wraps around moving parts, gets into electrical panels and causes stoppages. It also adds a particle load to the air people breathe.

Fibre collection works differently from conventional dust collection. Fibre is light and long; instead of settling in the duct it tends to cling. The filter surface therefore needs continuous cleaning; rotary filters or automatically cleaned units are preferred.

Humidity control

The moisture content of yarn and fabric directly determines breakage behaviour and static build-up. In dry conditions yarn breaks more often, static increases and fly multiplies. That is why humidification in textile facilities is a production requirement, not a comfort choice.

Humidification is usually adiabatic; as the water evaporates it draws heat from the room, so it also has a cooling effect. But hygiene of the system matters: a poorly maintained humidifier creates a microbiological risk.

Process heat

Textile machines produce a lot of heat. In ring spinning halls and especially in finishing areas, room temperature rises quickly. A system installed without calculating the heat load cannot bring the temperature down, despite a high air change rate.

In these areas the solution is usually twofold: part of the heat is captured at source and exhausted directly, and the rest is handled by general ventilation or cooling. Heat recovery units give significant savings in these facilities, which run at high airflow all year round.

Dye house and finishing

In dye houses and finishing areas, humidity, heat and chemical vapour are present together. The exhaust air is laden with moisture; if duct and fan materials are not chosen accordingly, corrosion starts within a short time. Exhaust from high-temperature equipment such as stenter frames is handled as a separate line.

Garment making and sewing

In sewing areas the priorities are operator comfort and control of thread dust. In these areas, where many people work, the amount of fresh air is set by occupancy; cooling load in summer and heating load in winter are taken into account.

Points to watch

In textile facilities, ductwork must be checked more often than in other sectors because of fibre build-up. Leaving cleaning hatches accessible ensures that these checks actually happen.

Seasonal change

Ventilation needs in textile facilities change markedly with the seasons. In winter the outdoor air is dry, so the humidification load increases; in summer process heat and outdoor temperature come together and cooling takes priority.

To run efficiently between these two extremes, the system is designed in stages: when variable speed fans, a fresh air ratio adjustable by season and a heat recovery unit are used together, annual consumption falls significantly.

In textiles, fibre collection and humidification affect each other: as humidity rises, fly decreases. Designing the two systems together rather than separately lowers the total investment.