Solvent-Free Polyurethane Laminating Adhesive for High-Speed 300m/min Flexible Packaging with FDA Compliance and Odorless Formula

Product Overview

Weeton 856A/856B is a two-component solvent-free flexible packaging laminating adhesive widely used for plastic/plastic, plastic/aluminum and other composite structures, including high-strength pharmaceutical packaging foil and aluminized inner layers. It features high peel strength, excellent surface wettability, excellent heat resistance, long pot life and no smell, and meets the requirements of high-speed lamination from 0 to 300 m/min.

Key Features

• High peel strength and excellent surface wettability
• Supports high-speed lamination from 0 to 300 m/min
• Excellent heat resistance and long pot life
• Odorless; cured adhesive layer is transparent, elastic and aging-resistant
• Suitable for boiling and steaming plastic/plastic structures
• FDA 175.105, GB9685 and EU 2002/72/EC compliant after full curing
• Does not affect the openability of the inner layer of composite film

Applications

• PET/milky white PE and PET/PE structures
• PET/CPP and PA/PE, PA/PCPP structures
• AL/PE structures for ordinary media
• High-strength pharmaceutical packaging foil and aluminized inner layers

Typical Technical Parameters

Directions for Use & Precautions

• Standard mass ratio is 100:60 (856A:856B); in high temperature and humidity reduce 856B content, and increase curing temperature and glue amount for CPP structures.
• Set glue container, hose, metering and coating roller temperatures per the typical use parameters (35-42C seasonal).
• Control precise tension and proper winding to prevent delamination, roll head size difference and film curl.
• Cure at 38-45C for 18-24 h for rewinding and slitting; aluminum foil composites need 45-50C for 36-48 h.
• When the machine is shut down over 40 minutes, clean the coating unit with a solvent/plasticizer mixture.
• If 856B shows small lumps in cold winter, preheat in the drying room or dosing tank before use.
• Install an efficient exhaust hood and follow isocyanate safety regulations.

FAQ