A cellulose pad can look acceptable when dry and still fail after repeated wet operation. Quality control therefore needs checks before production, during each process and on the finished block. The goal is not to publish one universal pass value; it is to define repeatable acceptance limits for the product the customer ordered.
Incoming material checks
1. Paper identification and condition
Record supplier, grade, GSM, roll or sheet batch, width and visible damage. Store paper dry and off the floor. Moisture variation can change corrugation and resin behaviour, so condition material consistently before a production trial.
2. Resin and adhesive verification
Confirm product identity, batch, shelf life, mixing instruction and storage condition. Record any approved dilution or viscosity measurement. Never change chemistry during a batch without documenting the reason and retesting the product.
In-process checks
3. Resin application consistency
Compare treated sheet mass or another agreed process-control measure across the working width. Watch for dry stripes, over-application, foam and roller build-up. Uneven treatment can cause local weakness or restricted absorption.
4. Drying and cure condition
Record temperature and line-speed settings together, because temperature alone does not show exposure time. Inspect for brittleness, tackiness, discolouration and sheet distortion. Confirm the method with the resin supplier and actual paper grade.
5. Flute geometry
Check flute pitch, height and angle at defined points across the sheet. Crushed or inconsistent corrugations change open area, bonding contact and airflow. Keep approved reference samples near the machine.
6. Adhesive line and bond
Inspect glue placement, continuity and squeeze-out. After curing, separate a sample using a documented method and record whether failure occurs in the paper, adhesive or interface. A repeatable shop-floor bond test is more useful than a visual claim.
Finished-pad checks
7. Dimensions and squareness
Measure height, length and thickness at agreed locations. Check diagonal difference or another squareness method. The tolerance should come from the customer's frame and installation method.
8. Face and edge condition
Inspect for torn flutes, blocked channels, loose sheets, resin stains, glue lumps and saw damage. Define how much cosmetic variation is acceptable and what affects function.
9. Wetting distribution
Use the intended water flow and observe how evenly the face wets. Dry zones may indicate product damage or a poor test manifold, so verify the distribution system before rejecting the pad.
10. Airflow or pressure comparison
Where equipment is available, compare pressure drop or airflow against an approved reference at the same test condition. Do not compare readings taken with different fan settings, pad sizes or wetting states.
11. Wet and dry integrity
Run a documented soak, drain and drying sequence appropriate to the product. Examine bond integrity, shape retention and surface condition. Longer validation may be required for a new material combination.
12. Identification and traceability
Mark every batch with production date, material batches, machine settings or job reference and inspection result. Traceability turns a customer complaint into a contained investigation instead of a guess.
Build a control plan, not a paperwork pile
Assign each check a method, frequency, sample size, acceptance limit, record and reaction plan. Start with the highest-risk characteristics and update the plan from real defects. For process-stage details, read our production-capacity guide and raw-material guide.
Honeywell India can discuss inspection access and process controls when configuring a new line. Product performance remains dependent on materials, settings, system design and end-user maintenance. Discuss your pad specification.