Double layer polyester filter bag

Product description

Double layer polyester filter bag for reliable depth filtration

The Double Layer Polyester Filter Bag is designed for liquid filtration applications where improved filtration efficiency and longer service life are required compared to standard single layer felt filter bags. By using a two layer depth filtration structure, this filter bag captures particles more effectively while maintaining stable flow and pressure characteristics.

Double layer polyester filter bags are commonly selected as a step up from conventional felt bags when contamination levels are higher or when longer operating cycles are required.

Filtration principle

The Double Layer Polyester Filter Bag operates using depth filtration. The filter media consists of two polyester layers with different porosity levels. As liquid flows through the bag, larger particles are retained in the outer layer, while finer particles are captured in the inner layer.

This staged filtration approach provides:

• improved particle retention

• higher dirt holding capacity than single layer felt bags

• more stable pressure behaviour

• reduced risk of rapid surface clogging

Depth filtration allows contaminants to be distributed across the media thickness rather than accumulating on the surface.

Double layer media design

The two layer polyester construction balances filtration efficiency and service life. Each layer plays a specific role in particle retention and mechanical support.

The double layer design:

• increases effective filtration depth

• improves contaminant distribution

• extends filter change intervals

• supports consistent filtration performance

This makes the filter bag suitable for medium to high contaminant loads.

Design and construction

Double Layer Polyester Filter Bags are manufactured from high quality polyester fibers selected for strength and dimensional stability. The construction ensures reliable performance under industrial operating conditions.

Typical design features include:

• double layer polyester depth filtration media

• thermally bonded or stitched construction

• stable shape retention during operation

• sealing ring options to minimise bypass

• compatibility with standard industrial bag filter housings

Performance characteristics

Typical performance characteristics include:

• filtration grades suitable for coarse to fine particle retention

• higher dirt holding capacity compared to single layer felt bags

• predictable and stable pressure drop

• consistent filtration efficiency over the service life

These characteristics make the filter bag suitable for both continuous and batch filtration duties.

Material compatibility

Polyester provides good compatibility with a wide range of industrial liquids and offers higher temperature resistance compared to some other polymer filter media. Material compatibility should always be verified for specific process conditions.

Typical applications

Double Layer Polyester Filter Bags are commonly used in:

• industrial liquid filtration

• water treatment and pre filtration

• chemical processing

• food and beverage production

• process liquids with moderate contaminant loads

• general industrial filtration

Key benefits

• Double layer depth filtration for improved efficiency

• Higher dirt holding capacity than standard felt bags

• Stable pressure behaviour

• Longer service life

• Suitable for demanding industrial applications

• Easy installation and replacement

Configuration and quotation

Double Layer Polyester Filter Bags are supplied based on application requirements. Selection parameters include:

• filtration grade

• bag size

• operating conditions

• housing compatibility

Filtra International can support correct filter bag selection to ensure optimal performance.