Filterexp specializes in manufacturing high‑performance dust filter bags designed for industrial dust removal and flue gas emission management. We offer complete, application‑oriented filtration solutions across multiple industries. Our filter bags guarantee reliable long‑term operation, prolonged service cycles and strict adherence to environmental protection requirements.

Additional Processing

Heat Setting

Singeing

PTFE Membrane Lamination

Water

Oil Repellent Treatment

Anti-static Treatment

Sewing & Structural Processing

Specification

-Material: Polyester (PET), PPS, P84, Acrylic, Fiberglass, Aramid, Polypropylene (PP).

-Thickness: 1.2 – 2.5 mm.

-Weight: 450 – 650 g/m².

-Width: 1.5 – 2.2 m (customizable).

Description

What is the calendering process? 

Calendering, also referred to as glazing, is an essential finishing process for filter fabrics of dust filter bags. During calendering, filter media runs through a group of precisionpolished metal rollers under precisely controlled temperature and pressure.

Usually carried out after singeing to eliminate loose surface fibers and prior to heatsetting, this process compresses surface fibers of the fabric to achieve a smooth, compact and even surface finish. Temperature and pressure are finetuned based on filter media types, delivering ideal surface treatment while preserving the fabric’s native filtration performance.

What are the benefits of calendering for dustcollecting filter bags?

Calendering delivers significant performance improvements for dust filter bags, boosting filtration efficiency, service life and overall operational stability.

Superior dust release for easier cleaning The smooth calendered surface stops dust particles from penetrating deep into fabric fibers. Dust cakes build up on the material surface and peel away readily during pulsejet cleaning. This cuts cleaning cycles and reduces pressure drop across the system.

Higher filtration efficiency By compressing surface fibers and narrowing the fabric’s effective pore size, calendering raises fineparticle capture efficiency. It achieves more complete dust separation to satisfy stringent emission requirements.

Longer service life A compact surface layer lowers fiber abrasion from dust friction and mitigates internal fabric clogging. This effectively extends filter bag service cycles and cuts replacement expenses.

Optimized dimensional stability Calendering reduces fabric shrinkage. It preserves the filter bag’s original geometry under hightemperature or highhumidity working conditions, preventing deformation that would degrade filtration performance.

Consistent surface performance Calendering creates uniform smoothness and density over the full filter bag surface. It eliminates uneven filtration zones and supports steady, dependable filtration output.

What filter materials are suitable for calendering?

Calendering works well with most needlepunched felts and woven filter fabrics, particularly synthetic fibers capable of enduring the heat and pressure involved in this finishing process. Typical applicable materials are listed below:

-Polyester (PET) Most commonly used for calendering. Boasts favorable heat resistance and mechanical strength, ideal for generalpurpose industrial dust filtration.

-Polypropylene (PP) Lightweight and corrosionresistant. Wellsuited for calendering and performs reliably under acidic and alkaline filtration conditions.

-Aramid (Nomex) Hightemperature resistant. Calendering is feasible with precise temperature regulation, making it a solid choice for hightemperature dust filtration such as boiler flue gas treatment.

-PPS (Ryton) Outstanding heat and corrosion resistance. Compatible with calendering and extensively deployed in harsh industrial filtration environments.

-P84 (Polyimide) Delivers high filtration efficiency and temperature tolerance. Calendering further optimizes its surface performance for finedust capture.

-Acrylic Offers moderate heat resistance. Suitable for calendering and widely adopted for mediumtemperature dust filtration.

-Fiberglass Calendering is viable under tightly controlled temperature settings to prevent fiber damage. It serves hightemperature filtration cases where alternative materials fail.

Note Calendering parameters including temperature, pressure and roller speed shall be customized for each filter material, to achieve optimal finishing results while preserving the material’s native performance.

Comparison of filter media performance

Difference Between Calendering and PTFE Membrane Lamination