Envelope Bag Cage

Space-Optimizing, Flat-Plate Filter Support Framework

The Envelope Bag Cage is a highly specialized structural framework designed to support envelope-shaped (flat and rectangular) filter bags inside industrial dust collectors. Unlike cylindrical or tapered cages, the envelope design features a completely flat, rigid grid. This geometry is purpose-built for cartridge-style baghouses where the primary goal is packing the absolute maximum cloth surface area into the smallest possible chamber volume, making it the premier choice for compact modular dust collectors in grain processing, pharmaceutical facilities, and chemical powder handling.

Featured Model Configurations

• EBC-01 | Standard Compact Frame

  Material: Carbon Steel | Coating: Hot-Dip Galvanized | Temp Rating: 250°C

  The baseline flat frame for standard, modular dust collectors operating in moderate-humidity environments like grain processing.

• EBC-06 | Extreme Chemical Resistance

  Material: SS316 Stainless Steel | Coating: Anti-Acid Coating | Temp Rating: 360°C

  The ultimate solution for heavily acidic or alkaline off-gassing in specialized chemical and pharmaceutical processing units.

Key Technical Specifications

Custom manufactured with lengths ranging from 1,000 to 5,000+ mm, widths from 120 to 280 mm, and tightly controlled thickness profiles (25 to 65 mm). Built using heavy-duty wire (Φ2.8–5.0 mm). Exceptional structural integrity with a tensile strength of ≥ 340 MPa and a hardness of 60–75 HRB. Built to a strict ±1 mm dimensional tolerance to ensure a perfect fit in tight cell plates. Corrosion-resistant coatings are rated to survive ≥ 500 hours in continuous salt spray testing.

Why Choose  Envelope Bag Cages?

Choose SENOTAY Envelope Bag Cages if your facility uses flat or rectangular envelope-style filter bags in space-restricted dust collectors, requiring maximum surface area packing density and uniform airflow distribution without the risk of bag collapse or sagging.

• Flat-Plate "Envelope" Geometry: Purpose-built flat rectangular frame fits tightly packed modular baghouse cells, maximizing total filtration surface density per square meter of floor space.

• Eliminates Dead Zones & Bag Sag: Rigid flat-grid matrix keeps filter media completely flat, preventing bag-to-bag contact, localized abrasion, or collapsed air channels during pulse-jet cleaning.

• High Thermal & Chemical Versatility: Fabricated from carbon steel, 304 stainless steel, or 316L stainless steel with specialized coatings (galvanized, silicone, or epoxy), withstanding continuous temperatures up to 350°C.

• Burr-Free Automatic Spot Welding: 100% fusion-checked weld joints (≥340 MPa tensile strength) ensure a smooth, precise frame that prevents fabric snagging and corner tearing.

• Ideal for Sensitive & Compact Facilities: Preferred by pharmaceutical, grain handling, food processing, and chemical powder plants operating compact or modular dust collection units.

Why Leading Plants Choose SENOTAY Envelope Bag Cage  

Factory-Direct Pricing. Certified Quality. Dedicated Support.

• Best Price Guarantee

• Certified & Compliant

• ISO 9001 and CE certified.

• Fast, Reliable Delivery

Comprehensive After-Sales Support

• Lifetime Technical Support: Dedicated engineering consultations covering custom wire mesh pitches, high-velocity side venturi integration, and specialized top snap-in header designs.

• Full System/Parts Availability: On-demand access to matching low-profile filtration components, including replacement envelope filter bags, cell plates, and high-frequency pulse valves.

• Remote Troubleshooting: Prompt technical diagnostics for complex field anomalies, such as flat-grid deflection, uneven pulse-jet pressure drops, or accelerated corner cloth abrasion.

Trusted by industrial environmental equipment and air filtration plants worldwide. Ready for yours.

Material Properties of Envelope Bag Cage

These materials provide exceptional strength, corrosion resistance, and dimensional stability under harsh industrial conditions.

Types of Envelope Bag Cage

Physical and Mechanical Properties of Envelope Bag Cage

Specifications Table for Envelope Bag Cage

Main Features of Envelope Bag Cage

• This Compact rectangular (envelope) structural design for effective space usage.

• It is Optimized  airflow passage to minimize dust adhesion and pressure drop.

• It Enhanced mechanical strength and stability for pulse-jet or reverse-clean systems.

• The Smooth welding  joints ensure minimal filter bag wear and long bag life.

• Custom venturi, frame and connection options compatible with different dust collector  models.

• Supports both pulse-jet cleaning and shaking-type dust collectors.

Why Envelope Bag Cage is Unique Compared to Other Bag Cages

The Envelope Bag Cage stands out due to its flat, space-efficient geometry. which improves dust releasing capability and maximizes filter bag area. The envelope shape allows closer cage arrangements without the airflow loss ideal for installations with compact dust collector layouts.

Additionally, due to reduced friction points and less mechanical wear, these cages significantly extend filter bag service life. Their robustness and low-maintenance operation make them a durable, cost-effective, and energy-efficient alternative to round or trapezoidal cages.

Why It’s Important to Have an Envelope Bag Cage in Your Dust Industry

• Enhanced      Filtration Efficiency – better air dispersion reduces      dust load and pressure loss.

• Extended Filter      Longevity – less bag-to-cage wear and consistent support during pulsing.

• Optimized Space      Utilization – perfect for compact or modular dust collection systems.

• Reduced      Maintenance Costs – corrosion-resistant finish      increases lifespan.

• Improved      Operating Stability – stable support framework      prevents filter deformation.

Advantages of Envelope Bag Cage

1. Easy installation      and replacement process.

2. Highly      customizable design to fit varied collector models.

3. Excellent      resistance to high temperatures and corrosive gases.

4. Improved dust      cleaning efficiency during reverse-pulse operations.

5. Lightweight yet      high-strength structure.

6. Sustainable      solution with long operational life.

Applications of Envelope Bag Cage

Envelope filter bag cages are essential in dust collection and air purification systems across numerous industries, including:

• Cement and  asphalt production

• Steel and metal  foundries

• Power plants  and energy facilities

• Chemical and petrochemical production

• Food and pharmaceutical operations

• Mining and quarrying sectors

• Woodworking and furniture manufacturing

• Waste recycling and incineration plants

Industries Using Envelope Bag Cage

• Cement Industry – for kiln and cement mill dust collection.

• Chemical &  Petrochemical – for capturing fine powders and vapors.

• Power Generation – ensures clean emissions from boilers.

• Food Processing – meet hygiene and emission standards.

• Metal Processing – collect metallic dust from grinding and cutting operations.

Why Choose Hebei OuTai Environmental Protection Equipment Co., Ltd

Hebei OuTai (Senotay) stands as a trusted manufacturer and global supplier of industrial dust filter bags.

Our Competitive Edge:

• We have Over 15      years experience in environmental air filtration systems.

• State-of-the-art      facility with international QC complianc.

• We  can have Custom-made designs to fit all      major baghouse systems.

• Quality      certification: We are ISO 9001:2015 certified.

• Global Service      Reach – We have Fast response, installation guidance and export logistics

Senotay’s commitment to quality ensures that every Acrylic filter bag performs efficiently in the world’s toughest environments.To save the environment is our main goal.

Explore More Dust Removal Accessories with Senotay.com

▪ Dust Filter Bag

    ▪ Polyester Filter Bag | FMS Filter Bag | Basalt Filter Bag | Nomex Filter Bag |

      PTFE Filter Bag | Acrylic Filter Bag | Fiberglass Filter Bag | P84 Filter Bag | PPS Filter Bag

▪ Dust Collector Bag Cage

    ▪ Dust Collector Bag Cage | Galvanized Bag Cage | Silicone Bag Cage | Trapezoidal Bag Cage | Envelope Bag Cage | Cage Venturi Tube

▪ Dust filter element

   ▪ Air Filter Element | Top-mounted Dust Filter Element | Oblique-insert Dust Filter Element | 

     Lifting Dust Filter Element | Six-Ear Quick-release Dust Filter Element | Threaded Dust Filter Element | Flange Dust Filter Element

▪ Electromagnetic pulse valve

    ▪ DMF-Z Right Angle Solenoid Pulse Valve | DMF-Y Submerged Electromagnetic Pulse Valve

▪ Industrial Electric Precipitation Accessories

    ▪ Cathode Wire | Dust Collecting Plate | Vibrating Hammer | Bearing In Dust | Electrostatic Precipitator Porcelain Sleeve

FAQs About Envelope Bag Cage

Q1: What makes envelope bag cages better than round cages?
A: The envelope shape improves airflow uniformity, maximizes filtration area, and allows compact system design.

Q2: Can Outai produce custom envelope bag cages?
A: Yes. We specialize in fully customized cages based on your dust collector size, filter bag type, and operational conditions.

Q3: What materials are used in manufacturing?
A: Carbon steel, galvanized steel, and stainless steel 304/316 with multiple coating options.

Q4: Are they suitable for high-temperature operations?
A: Yes. Our coated cages withstand continuous temperatures up to 350°C.

Q5: How long does an envelope bag cage last?
A: Under proper maintenance, these cages can last 8–10 years or longer.