Air filter bag SEFAR TETEX®

wire meshknitted meshsynthetic composite

Overview
Sefar fluid bed dryer bags provide controlled drying, secure particle retention and contamination control with GMP-compliant options for regulated processes. Engineered for compatibility with leading OEM equipment and optimized across machine types, they deliver correct fit, effective airflow management and repeatable product quality.

Contamination-Free, Consistent Drying
Developed for OEM integration and diverse equipment, Sefar bags ensure secure retention and contamination control while supporting efficient drying cycles and consistent end-product characteristics.

Single Tube Bags
Single-tube designs are used in advanced fluid bed systems requiring high form stability and controlled airflow. Suited to reverse-air or pulse-jet cleaning, single-tube bags (including bonnet variants) are available in conical or envelope shapes. Filtration principle: outside-to-inside. Frequent cleaning cycles demand superior dimensional stability.

High-Performance Single-Tube Options
Sefar single-tube bags use closed multifilament fabrics to deliver stable form, secure retention and consistent performance for drying, mixing and granulation operations.

Single-Tube Coating Bags
Coating versions retain the same outer geometry and cap layout as standard bags. An open-mesh filter section enables high airflow for rapid, uniform coating while maintaining precise fit and static-controlled handling.

Multi Tube Bags
Multi-tube bags are the standard configuration for most fluid bed dryers. Designed for inside-to-outside filtration, they allow flexible sizing, support shaking systems and suit broad application ranges. Variants include circular multi-tube, D-shape multi-tube and bonnet types. Cleaning: shaking or lifting. Available with multiple bottom disc and mounting ring options.

Optimized Filter Bags for Drying and Mixing
Sefar closed multifilament filter bags are used across FBD processes such as drying, mixing and granulation, providing durable retention-optimized performance for clean and repeatable processing.

Coating Bags with Optimized Airflow
Coating bags keep the same skirt and cap arrangement as standard bags; their open-mesh filter areas ensure high airflow and uniform product coating with reliable fit and handling.

Filter Media Technology
The portfolio includes closed multifilament fabrics with antistatic structures and open-mesh fabrics tailored for fluid bed applications, with certified options for regulated use and optimized performance across industries.

Key Product Features

• Filter Efficiency
  Air permeability ranges matched to process and particle retention requirements to maintain consistent flow across equipment types.
• Material Compliance
  Certified materials and application expertise to support food-contact and pharmaceutical compliance (GMP/FDA/EU/ISO where applicable).
• Mechanical & Chemical Properties
  Engineered for dynamic airflow and high-volume processing: strong mechanical stability, secure fitting and validated resistance to frequent washing cycles.
• ATEX Directives
  Conductive filter fabrics and verified conductivity testing on finished bags to prevent electrostatic discharges in ATEX-classified environments.

Compatibility
Sefar fluid bed dryer bags are compatible with equipment from leading manufacturers and OEMs; OEM-specific cap and hook designs are available to ensure correct fit.

Manufacturing & Compliance
Options include food-compliant multilayer fabrics with conductive yarns for safe drying, mixing and granulation. Finished bags can be uniquely marked for full traceability to support validation and regulatory compliance. Welded seam technology improves durability and reduces particle leakage for longer service life in critical applications.

Technical characteristics / specifications

• Bag types: single-tube (conical, envelope), single-tube bonnet, multi-tube (circular, D-shape), bonnet variants.
• Filtration principles: outside-to-inside (single-tube) and inside-to-outside (multi-tube).
• Cleaning methods: reverse air, pulse-jet, shaking, lifting depending on bag type and equipment.
• Filter media: closed multifilament fabrics, open-mesh fabrics, multilayer food-compliant fabrics, antistatic and conductive yarn options.
• Compliance: GMP-compliant options, materials certified for food and pharma use, traceable batches and unique ID marking.
• Safety/standards: ATEX-compatible conductive fabrics; conductivity testing on finished bags.
• Mechanical properties: high form stability, secure retention, engineered airflow/particle retention balance, validated washability.
• Fit & installation: OEM-specific cap and hook designs, varied bottom discs and mounting ring types for correct fit.
• Quality features: welded seams for improved durability and reduced leakage; coating options with open-mesh sections for high airflow.