Precautions for Using Waterborne Adhesives for Composite Films

Shishi Xinguang Packaging Co., Ltd. began formal use of water-based adhesives two years ago. Its main purpose is to reduce the transfer of aluminum-plated films and shorten the lead time. Through long-term use, the company's technical staff has summed up some experiences for your reference:

Compared with solvent-based adhesives, although the operation of aqueous adhesives is relatively simple, but also pay attention to control some aspects.

(1) Since the amount of water-based adhesive sizing is very small, the engraved roller must select a dense and shallow laser engraved roller, usually 200 lines/35U, and the opening of the laser roller mesh is relatively large, so as to ensure the water-based adhesive The adhesive can be better transferred to the film.
(2) Before using the water-based adhesive, the water-based adhesive must be slowly stirred in the barrel for 5 to 10 minutes to ensure that the various additives in the water-based adhesive are uniformly mixed.

(3) The surface tension of the film should be tested before gluing. It is better to use dyne solution instead of dyne pen. The surface tension of the film should be at least 3.8 × 10-2N/m, and the surface of the ink should be Testing.

(4) Use a counter-rotating roller as much as possible. The reverse flattening roller has a great influence on the appearance. By adjusting the speed, the appearance can achieve the best effect. (5) The oven temperature is set to 80 °C, 85 °C or 95 °C (the temperature can not be switched on until the set temperature). Because the air volume is important for the drying of aqueous adhesives, the air inlet and exhaust of the oven must be maximized. The compound hot drum temperature is set to 75-85°C, and the compound hot drum pressure is set to maximum. (Note: For the setting of temperature, it is recommended to operate as much as possible under the above conditions when considering the tolerance of the film and process.)

(6) An air diaphragm pump must be used between the glue tank and the water-based adhesive barrel. Clean the pump before use. Do not mix with the solvent.

(7) To prevent jamming, the scraper must be released during shutdown and the top roller soaked in the aqueous adhesive to maintain rotation.