What Is Cold Glue? A Complete Guide for Packaging Industry

Cold glue is a common water-based adhesive widely used in the packaging and printing industry. Different from hot melt glue that requires high-temperature heating, cold glue can be sprayed and bonded at room temperature without heating and melting. It cures naturally through water evaporation and substrate absorption, which makes it an energy-saving and cost-effective bonding solution.

Mainly made of PVA water-based materials, cold glue features stable bonding strength, high temperature resistance and clean glue layer. It leaves no traces on finished products, perfectly suitable for cartons, folding boxes, books, pharmaceutical packages and envelopes. With simple equipment cleaning and low consumption costs, it has become a mainstream choice for paper packaging production lines.

For smooth materials like coated films and plastics, plasma surface treatment can be matched to improve adhesion. Equipped with professional cold glue spraying machines and cold glue detection systems, automatic production lines can intelligently detect missing glue, offset glue and abnormal glue volume, eliminating full manual inspection, avoiding production shutdowns and defective products.

As a professional packaging automation supplier since 2008, KQ Auto provides one-stop cold glue spraying, glue quantity detection and plasma surface treatment solutions, supporting customized equipment for diverse high-speed packaging production needs worldwide.