Hot melt adhesive is melted into a liquid state using a hot melt machine through thermal energy. The melted adhesive is then delivered via the machine's hose and spray gun to the surface of the substrate. Upon cooling, the hot melt adhesive solidifies, completing the bonding process. It meets all requirements for carton sealing while overcoming the drawbacks associated with previous carton sealing methods.

Advantages of Hot Melt Adhesives

1. Fast Bonding: The entire bonding process can be completed in just 1–3 seconds (or even faster).

2. Compact Equipment: Hot Melt Adhesive machines are small in size, making them convenient to place in a corner of the workshop and easy to operate.

3. Low Production Cost per Unit: Offers the most economical production cost for unit products.

4. Excellent Bonding Effect: Provides high bonding strength, enhancing the overall strength of cartons and making them less prone to deformation or cracking.

5. No Waste Disposal Issues: Complies with environmental protection standards and meets packaging requirements for export products.

6. Anti-Tampering Function: Helps verify whether packaged items have been tampered with or opened without authorization.

7. Customizable Spray Patterns: Allows adjustment of spray methods for identification and anti-counterfeiting purposes.

Characteristics of Hot Melt Adhesives
Hot melt adhesive is a 100% solid, solvent-free, and water-free thermoplastic polymer. At room temperature, it remains solid, but when heated to a certain temperature, it melts into a flowable and adhesive liquid. In its molten state, it appears as a light brown translucent or off-white substance.

The primary component of hot melt adhesive is the base resin, which is a copolymer of ethylene and vinyl acetate (EVA) synthesized under high pressure. It is further formulated with tackifiers, viscosity modifiers, antioxidants, and other additives.

As a 100% solid material, hot melt adhesive melts upon heating and solidifies upon contact with air and cooling, completing the bonding process in just a few seconds. Compared to solvent-based and water-based adhesives, its main advantages include:

1. Instant Bonding: Ensures high-efficiency production.

2. No Drying Equipment Required: Saves space.

3. Non-Toxic and Non-Flammable: No risk of pollution or environmental hazards.

4. Long-Term Storage Stability: Does not deteriorate over time.