Key Quality Control Factors for Custom Non-Standard Dust Filter Bags

During the operation of dust collection systems, the quality of custom non-standard filter bags directly impacts overall dust removal efficiency. To ensure stable system performance, focus on the following critical quality control elements:

1. Accurate Measurement of Installation Dimensions

Key dimensional parameters:

Collar inner/outer diameter: Must precisely match tube sheet holes to ensure airtight sealing.

Bag body length: Must avoid contact with the hopper and ensure uniform airflow distribution.

Overall length: Must fit the internal space of the dust collector.

It is recommended that professional technicians conduct on-site measurement and verification to ensure data accuracy.

2. Detailed Confirmation of Operating Conditions

Mandatory operating parameters to clarify:

Gas temperature range: Including normal and extreme temperature values.

Gas chemical composition: Focus on corrosive component content and pH value.

Dust characteristics: Including chemical composition, particle size distribution, and humidity.

Ash cleaning method: Different cleaning methods impose specific requirements on filter bag material and structure.

3. Scientific Selection of Filter Media

Material selection recommendations:

Normal temperature conditions: Polyester is recommended.

High-temperature/corrosive conditions: Specialized materials such as PPS, P84, or PTFE are preferred.

High-humidity conditions: Water and oil repellent treatment is required.

Ultra-low emission requirements: PTFE membrane-coated filter media is prioritized.

Selection principle: Choose the most cost-effective material solution based on actual operating conditions.

4. Rational Design of Collar Structures

Main structural types:

Spring ring structure: Enables easy installation with excellent sealing performance.

Flange-type structure: Suitable for high negative pressure applications with superior sealing.

Cuff-type structure: Features simplicity but has room for improvement in installation convenience and sealing. Verify tube sheet hole compatibility, preferably by providing physical images of holes or precision engineering drawings to confirm structural fit.

5. Optimization of Bag Bottom Structure

Reinforcement measures:

Extended bag bottom design to provide extra wear allowance.

Double-layer reinforcement process to enhance wear resistance in high-abrasion areas.

Special structural designs (e.g., hoop structures) to effectively disperse stress concentration.

6. Technical Specifications for Sewing Process

Quality verification points:

Sewing thread material: Must ensure chemical compatibility with the filter media, including matching temperature resistance and corrosion resistance (PTFE or PPS threads are recommended).

Process standards: Evaluate stitch uniformity, rational stitch density, and number of sewing lines (three-thread sewing offers higher structural strength than two-thread sewing).

Edge treatment: Verify that binding on critical areas (e.g., collars and anti-collapse rings) effectively prevents material abrasion and cracking.

7. Customization Requirements for Filter Cages

Custom design specifications:

Vertical accuracy control: Ensure vertical suspension of filter bags to avoid friction with the dust collector housing.

Wire spacing design: Spacing between cage wires must be precisely matched to filter bag type and ash cleaning intensity.

Surface treatment: Anti-corrosion treatments such as silicone coating or electro-galvanizing are recommended to prevent bag sticking caused by rust.