Update:Many packaging manufacturers face adhesion failure when laminating thick PE films for high-temperature sterilization. Zh...
Many packaging manufacturers face adhesion failure when laminating thick PE films for high-temperature sterilization. Zhejiang Ruico’s LB 165A and LB 165B two-component solvent polyurethane adhesive solves this pain point perfectly.
This adhesive system is specially optimized for 70–130 μm thick PE substrates, while compatible with aluminum foil, treated PP, PET, nylon and metalized films. Its low viscosity brings excellent surface wetting, matching high-speed gravure lamination machines. After proper processing, composite films can withstand 40 minutes of 100°C boiling and 30 minutes of 121°C retort treatment, with powerful initial tack and long-term stable bonding. The cured glue layer is transparent, odor-free and anti-aging, without damaging the printed appearance of packaging bags.
The standard mixing ratio of A and B agent is 20:3.5, adjustable to 20:3–4 for metalized film lamination. Operators can dilute raw materials with low-moisture ethyl acetate, acetone or MEK to 30%–45% working solid content. Aromatic and alcohol solvents cannot be used, which will destroy crosslinking reaction.
Pay attention to pot life control: mixed adhesive can be used for 8 hours under normal temperature, but only 2 hours in hot and humid tropical workshops. Dry coating weight is controlled at 2–3.5 g/m²; printed films need an extra 1 g/m² coating amount. Adopt three-stage gradient drying temperature to reduce solvent residue, and increase nip roller temperature and pressure to strengthen composite fastness.
Complete curing takes 7–14 days at room temperature to obtain full heat and chemical resistance. This product passes FDA, EU plastic safety standards and China GB 9685-2016, safe for food contact. Unopened products have a 9-month shelf life; avoid direct skin contact with hardener containing polyisocyanate.
Ruico suggests conducting small batch trials before mass production, as film additives and printing ink will affect lamination results. If you produce boiling bags and retort food pouches with thick PE layers, LB 165A/LB 165B is your best solution.
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