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Aluminum foil coated paper has a layer of metal film on its surface, which is dense, smooth, and has low surface energy,Hot melt adhesive granulesIt is difficult to wet after coating, and the initial adhesion is much lower than that of copperplate paper or kraft paper. Many packaging factories have reported that “even when the temperature is high and the amount of glue applied is sufficient, it cannot stick”, and the fundamental reason is that the glue type is incorrect – the universal EVA hot melt adhesive particles have insufficient affinity for low surface energy materials, and high adhesion specialized models need to be selected.
It is recommended to use modified EVA or APAO based hot melt adhesive particles with a higher proportion of tackifying resin. This type of adhesive has a moderate softening point (80-95 ° C), a slightly longer opening time, and can be fully wetted on the aluminum foil surface before curing. The peel strength can reach 4N/cm or more. Sunlife hot melt adhesive has launched a special model for aluminum foil coating scenarios. After testing by multiple cosmetics box factories, the bonding strength has increased from 60% of universal adhesive to over 95%.
Bookbinding is a problem that every reader needs to face, and hot melt adhesive is a widely used binding method nowadays. This method has more advantages and disadvantages compared to traditional staples and glue binding. Next, let’s explore in detail. Advantages Hot melt adhesive is a very strong glue, so bound books are very sturdy. […]
Wireless glue binding machines are widely used in graphic and text fast printing stores. Common problems and solutions in the binding process of glue binding machines include: 1、 Poor quality behind the book core milling1. If the book core is not neat or placed neatly, it should be ensured that each piece of paper is […]
Determine whether the material used to make the box is the same as before, and whether the surface has been treated, such as copperplate paper, with completely different properties from the original one. The performance differences of hot melt adhesives for the same purpose in the market are not significant. It will be difficult to […]
Conclusion The amount of glue used is small, and there are many varieties (books, packaging, and quick printing require a little each). Buying each item alone cannot meet the minimum order quantity, and the unit price is high. Using “mixed batch and combined order” – combining multiple categories of orders from the same supplier, or […]
