Usage Method of BOPP Film Lamination Adhesive (for bonding BOPP film to paper or other substrates) typically includes the following steps. Specific operations should be adjusted based on the adhesive type (e.g., water-based, solvent-based, or solvent-free) and equipment conditions.

I. Pre-Use Preparation

Substrate Treatment
- Surface Cleaning: Ensure the BOPP film and the substrate (e.g., paper) are free of dust, oil, or moisture. Wipe with alcohol if necessary.
- Corona Treatment: The BOPP film surface must undergo corona treatment to increase surface energy (≥38 dynes/cm) for better adhesive bonding.
Adhesive Selection
- Choose the adhesive type based on the process:
  - Water-based adhesive: Eco-friendly, odorless, requires drying (e.g., for paper-film lamination).
  - Solvent-based adhesive: Fast-drying, suitable for high-speed lamination (ensure proper ventilation).
  - Solvent-free adhesive: Requires specialized equipment, eco-friendly but sensitive to operating temperature.
Equipment Inspection
- Ensure the coating machine, laminator, drying oven, etc., are clean and that temperature and pressure settings are adjustable.

II. Adhesive Preparation (If Required)

Dilution: Adjust viscosity using a dedicated thinner (water, alcohol, etc.) according to the manual, typically measured with a Zahn cup (e.g., 25-30 sec).
Additives: Some adhesives require a hardener (usually 1-3% ratio). The mixture must be used within the specified time.

III. Coating and Lamination

Coating
- Use an anilox roller or doctor blade to apply the adhesive evenly. The coating thickness is generally 1.5-3 μm (dry adhesive amount: ~1.5-3 g/m²).
- Insufficient coating may cause delamination, while excessive coating may lead to wrinkles or poor drying.
Drying (for solvent-based/water-based adhesives)
- Drying temperature: 50-80°C (higher for water-based adhesives). Ensure complete solvent evaporation to avoid bubbles or residue.
Lamination
- Press the coated BOPP film and substrate together using laminating rollers. Typical pressure: 0.2-0.6 MPa; temperature: 40-60°C.

IV. Curing and Aging

Initial Curing: Lightly press immediately after lamination to remove air bubbles. Allow initial curing at room temperature (~1-2 hours).
Aging: Place in an aging chamber (40-50°C) for 24-48 hours to ensure complete adhesive cross-linking and final bond strength.

V. Quality Inspection

Appearance: Check for bubbles, wrinkles, or delamination.
Peel Strength: Test according to standards (e.g., ≥1.5N/15mm).
Weather Resistance: Evaluate temperature and humidity resistance (e.g., 80°C oven or freeze testing).

VI. Precautions

Environmental Control: Maintain humidity ≤70% and temperature at 15-30°C.
Safety Measures: Use explosion-proof ventilation for solvent-based adhesives; wear gloves and masks.
Adhesive Storage: Store in a sealed, dark place. Water-based adhesives should be protected from freezing; solvent-based adhesives must be kept away from ignition sources.
Equipment Maintenance: Regularly clean coating rollers to prevent adhesive buildup.

Troubleshooting Common Issues

Delamination: Check corona treatment, adhesive coating amount, or aging time.
Bubbles: Adjust drying temperature or laminating pressure.
Adhesive Skinning: Seal the container immediately after use.

Before first-time use, conduct a small-scale test and strictly follow the adhesive manufacturer’s technical guidelines. Different brands (e.g., H.B. Fuller, Kangda) may have specific requirements—refer to their manuals for details.