“A perfectly good print run, ruined by bubbles after lamination. This order is going to cost me.”
Bubbling is one of the most common headaches in the printing and packaging industry. Whether it’s small blisters across the sheet or large areas of delamination at the edges, the result is the same: a whole batch goes to waste. We spoke with several lamination operators with over a decade of experience, and they shared a simple three-step troubleshooting method to quickly identify the problem and fix it.
Step 1: Check the Paper — Humidity Is the Hidden Culprit
Symptoms: Bubbles appear randomly across large areas, especially near the edges.
How to Check:
· Touch the paper to see if it feels damp or soft
· Fold the paper and look for wrinkles along the crease
Many bubbling problems aren’t caused by the machine—they start with the paper. If the paper’s moisture content exceeds 8%, the water turns to steam during lamination and creates bubbles.
Solutions:
· Let the paper sit in the workshop for at least 24 hours before laminating so it adjusts to the environment
· For rush orders, use a dehumidifier or preheat the paper
· Best moisture range: 5%–7%
Step 2: Check the Adhesive — Temperature and Pressure Must Match
Symptoms: Tiny, pinpoint bubbles, or bubbles that appear after lamination.
How to Check:
· Make sure the adhesive is well mixed, with no sediment or clumps
· Check if the heating roller temperature is stable (use a thermometer to test multiple spots)
If the adhesive isn’t fully dry before winding, or if the temperature is too low, you’ll get bubbles. This is especially true in winter—you need to set the temperature 5 to 10 degrees higher than in summer.
Solutions:
· Adjust the temperature based on the adhesive type (typically 80°C to 110°C)
· Maintain even pressure; regularly inspect the pressure roller for warping
· Let the product cool naturally after lamination before winding—don’t rush it
Step 3: Check for Dust — Cleanliness Is the Foundation
Symptoms: Small, raised bumps appearing randomly across the sheet.
How to Check:
· Inspect the paper surface under bright light for dust or paper debris
· Check the laminator’s pressure roller for stuck particles
Eighty percent of bubbling comes from dust. If your workshop isn’t clean, even the best machine won’t save you.
Solutions:
· Use an anti-static brush or blower to clean the paper surface before laminating
· Clean the pressure roller at the end of each day; perform a deep clean weekly
· Keep workshop humidity between 50% and 60% to reduce static and dust attraction
The Golden Rule
Damp paper, cold rollers, or a dusty start —These three are where most bubbles start.
Let paper rest, heat the glue, set pressure right, Clean your gear, and the job comes out tight.
Prevention Is Better Than Fixing
Problem Type Common Cause Preventive Measures
Large bubbles Paper too damp Let paper acclimate; use dehumidifier
Small, scattered bubbles Wrong temperature/pressure Match temperature to adhesive type; inspect pressure roller regularly
Raised bumps Dust or debris Clean paper surface; maintain pressure roller
