Master Filtration Standard Operating Procedure (SOP) for Liquid Filter Bag Production

MASTER FILTRATION defines the standardized process for manufacturing liquid filter bags, ensuring consistent quality, performance, and compliance with industry standards.
 

1. Scope

This SOP applies to the production of liquid filter bags in Master Filtration, covering material preparation, fabrication, quality checks, and packaging.

2. Responsibilities

Production Team: Operate machinery, assemble filter bags, and follow quality protocols.

Quality Assurance (QA): Inspect materials and finished products.

Maintenance Team: Ensure equipment is calibrated and functioning properly.

Quality testing equipment (e.g., bubble point tester, integrity tester)

3. Materials & Equipment

Filter media ( polypropylene, polyester, nylon, PTFE)

Sewing machines (ultrasonic and thermal bonding equipment)

Metal or plastic rings for top support

Measuring and cutting tools

4. Production Procedure

4.1 Material Preparation

Material Inspection:

Verify filter media type, micron rating, and batch number.

Check for defects (tears, uneven coating, dirty media).

Cutting:

Cut filter media to specified dimensions using templates.

Ensure edges are clean and free of fraying.

4.2 Bag Assembly

Seam Construction:

Sew or weld seams using approved methods (stitching, ultrasonic welding).

Ensure no gaps or weak points in seams.

Ring Installation:

Attach metal/plastic support rings to the bag opening.

Secure gaskets for proper sealing in housings.

Bottom Closure:

Seal the bottom of the bag (stitched, welded).

4.3 Quality Control Checks

Visual Inspection:

Check for stitching defects, holes, or contamination.

Dimensional Check:

Confirm length, diameter, and ring alignment match specifications.

Integrity Testing:

Perform bubble point or pressure decay tests to validate pore size.

4.4 Packaging & Labeling

Cleaning:

Remove dust/debris (for critical applications, use cleanroom packaging).

Packing:

Place filter bags in sealed poly bags packaging.

Labeling:

Include:Micron rating, Material type, Batch number, Manufacturing date.