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Many operators find that the BOPP film surface cannot stick, and their first reaction is to add glue. In fact, increasing the adhesive amount from 40g/m ² to 80g/m ² does not increase the bonding strength by less than 20%, but instead causes overflow, waste, and slow curing. The fundamental reason is that the surface energy of BOPP film is only 30-34mN/m,hot melt adhesiveUnable to infiltrate – it’s not a lack of glue, it’s glue that can’t hold on.
The correct approachReplace with low surface energy specialized hot melt adhesive particles containing thickening resin and polar modifier, which can increase the adhesion of BOPP film by more than 3 times.
When the coating temperature was increased from 170 ° C to 200 ° C, the BOPP film wrinkled and deformed, and the adhesive liquid penetrated the film layer, causing delamination. High temperature does not equal high viscosity, exceeding the upper limit of material temperature resistance can have the opposite effect.
The correct approachThe coating temperature should be controlled at 170-180 ° C, and the opening time should be 3-5 seconds for the model to allow sufficient time for the adhesive to wet the film surface.
Some factories use universal hot melt adhesive particles to simultaneously bond kraft paper, copperplate paper, and BOPP film, resulting in only the BOPP surface being opened. The surface energy of different materials varies greatly, and targeted selection is necessary.
The correct approachBOPP film surface is individually coated with adhesive. Sunlife hot melt adhesive has BOPP specific models, and Guangzhou Sunlife Trading provides free comparative testing services. One set of samples can verify the difference in effectiveness.
EVA hot melt adhesiveWhat are they made of and can they be recycled? The difference between biodegradable and bio based packaging follows a global trend where consumers want to produce and purchase more environmentally friendly products. The awareness and recognition of more environmentally friendly and sustainable packaging materials (such as reusable, biodegradable, etc.) are growing, […]
Petroleum resin is a thermoplastic resin produced by pre-treatment, polymerization, distillation, and other processes of C5 and C9 fractions produced as by-products of petroleum cracking. It is not a high polymer, but an oligomer with a molecular weight between 300-3000. C5 petroleum resin ① Name and characteristics Chinese alias: C5 resin; Fatty hydrocarbon resin. English […]
Direct answer: One kilogram of hot melt adhesive granules specifically designed for books and periodicals, estimated to be able to hold approximately 80-120 books in a common A4 booklet (about 150 pages, with a book back length of about 29.7 centimeters); There are more pocket books and thin books, up to 150 or more; Thick […]
Direct answer:Hot melt adhesive pelletsThe cost of raw materials generally accounts for 65% to 80% of the factory price. Taking EVA type hot melt adhesive granules commonly used in book binding as an example, in 2026, the raw material cost will be approximately 9000-13000 yuan per ton, while the finished product price will mostly fall […]
