At a Glance
- 0 Pop-Opens in Validation
- 22% Higher Line Throughput
- 3x Bond Margin in QA
Production validation on a high-speed folder-gluer line.
UV varnish was blocking fiber penetration on the side seam
The converter had stable line speed but inconsistent fiber tear, especially on narrow pharmaceutical carton formats with heavy varnish coverage.
- Cartons were opening after packing and transport simulation.
- Existing adhesive built surface tack but not enough substrate anchoring.
- Rejected lots created pressure from brand owners and QA teams.
A low-viscosity, deep-penetrating carton adhesive tuned for varnished board
Senda adjusted penetration, open time, and compression response so the glue line could anchor below the coating layer before final set.
Products Used:
- Pharma Carton Side-Seam Formula
Built for coated substrates and narrow glue flaps running at high speed.
Execution
Board and coating characterization
Senda profiled absorbency and glue-line behavior across the customer core carton constructions.
On-line compression study
Machine settings were retuned to maximize seam integrity without slowing the line.
Release qualification
Drop, vibration, and chamber testing confirmed seam stability before commercial rollout.
Commercial result
Commercial result
Across validated production lots after the switch.
Higher confidence allowed a faster validated line speed.
Reduced because QA data was consistent and repeatable.
Related resources
- Bonding UV & Coated Stocks: A Folder-Gluer Technical Guide
Penetration, open time, and compression on varnished carton board—the primary guide for this case study.
- PSA Selection for Plastic Packaging Substrates
When film-laminated board or PSA closure zones are in scope—substrate energy and peel targets before folder-gluer trials.
- Request a 1 kg folder-gluer trial
Prepaid sample for side-seam fiber-tear screening on UV-coated pharma carton constructions.
" We struggled to get reliable fiber tear through heavy UV varnish on narrow pharma flaps. Senda's formulation passed our pop-open and transport-simulation lots and runs cleaner than the incumbent on the folder-gluer line. "
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