Widely used as an alternative to solvent-based adhesives, and tape packaging, hot melt adhesive systems are revolutionising production in businesses that rely on the cost-effective and swift bonding of materials. The packaging, printing, textile and non woven industries increasingly rely upon hot melt adhesives due to the savings they afford in both time and money.
How Hot Melt Adhesives Are Used
Hot melt adhesives effectively attach substrate surfaces in either a permanent or temporary bond. As solvent-free thermoplastics, hot melt adhesives are applied in a molten state. At room temperature, hot melt adhesives are in a solid form. However, when heated to 60°C, they become a viscous fluid and bond materials between temperatures of 60°C – 200°C. The adhesive sets rapidly when it cools, providing a strong bond. If required, the adhesive can be reheated and then bonded again.
Applied by spraying, extruding or rolling, with hot melt adhesives, joining either follows immediately after application or when the solidified layer is reheated. To match production requirements, adhesive systems vary in size from hand-held guns to bulk feeding drums. Once in a liquid state, the adhesive is pumped to the application head and applied to the substrate.
Jetting applicators are frequently used in packaging and assembly procedures, spraying either an intermittent or continuous bead of adhesive. Intermittent beads can be applied quickly, providing a stitching effect as an alternative to staples.
Spray-applicators have nozzles that spin a swirl pattern of adhesive, offering cost reductions in adhesive usage and simpler mounting equipment. They cover more surface area than bead applicators while creating a strong bond.
The Valco Melton range of adhesive applicators offers exceptional value for money with excellent reliability and adaptability. Fast adhesive delivery rates, coupled with precision and a high level of control, guarantee uniformity and quality throughout the production process.
Reduce Curing Time
Whereas water and solvent-based adhesives require significant time to dry, hot melt adhesives cool rapidly and bond at room temperature. In addition to eliminating the cost of drying ovens and other equipment, factories can use space previously given to curing and storage for more profitable aspects of production.
The Importance Of Regular Maintenance
To fully profit from the savings in both time and money that hot melt adhesives provide, a company needs to keep its production line running efficiently. Degraded adhesive can stop production, so it is essential to have frequent, expert maintenance that will sustain efficiency and avoid problems on high volume production runs.
Image Source: Pixabay