List of Hot Melt Glue Particle Coating Methods for Corrugated Paperboard: 4 Solutions with Advantages and Disadvantages Quick Check

What coating method is used for laminating corrugated cardboard?

Corrugated cardboard mounting (bonding of surface paper and corrugated core paper) is a high-frequency scene in the packaging industry.hot melt adhesive pelletsThe coating method directly affects the bonding quality, production efficiency, and adhesive cost. The following is a comparison list of four mainstream coating methods.

• 1. Roller coatingUniform application of rubber rollers, suitable for large-area flat coating; The advantages are uniform coating and fast speed; The disadvantage is that the amount of adhesive is difficult to adjust and the corners may not be coated. Suitable for mounting on standard cardboard boxes.
• 2. SprayingHot melt adhesive is atomized and sprayed through a nozzle; The advantages are flexible coverage and the ability to spray locally; The disadvantage is that the adhesive loss is large (about 15-20% scattering), and the nozzle is prone to clogging and needs to be cleaned regularly.
• 3. Scraper coatingScraper controls the thickness of the adhesive layer; The advantage is that the adhesive layer is extremely thin and precisely controllable; The disadvantage is that the viscosity of the adhesive is required to be high and it is not suitable for high-speed lines.
• 4. Extrusion line coatingSqueeze strip adhesive along the bonding line; The advantages are the least amount of glue and precise positioning; The disadvantage is that it is only suitable for linear bonding and not suitable for full width coating.

Frequently Asked Questions (FAQ)

Q: What is the reason for the deformation of corrugated cardboard after mounting?

A: Excessive glue or uneven coating can cause local heating and moisture. It is recommended to use roller coating to control the adhesive amount between 60-80g/m ², or use extrusion line coating to reduce the heating area of the surface paper.

Q: How long does it take for hot melt adhesive particles to be mounted before entering the next process?

A: Hot melt adhesive particles solidify quickly, usually taking 5-10 seconds to transport after coating and pressing, and fully curing after 30 seconds. It is much more efficient than cold glue.