Лако-красочные материалы — производство

A. Veneer Splicing

Particleboard with a decorative wooden veneer surface usually employs a hot-melt adhe­sive to effectively mate veneer edges down the length of the joint. Polyamide hot-melt adhesives are widely used for this veneer splicing process. The adhesive is more often than not supplied as a thread and positioned as such in a zigzag configuration. A heated press is employed to activate the adhesive followed by rapid cooling and setting. The rapid set required is best achieved with polyamide hot-melt adhesives, since their setting tempera­tures are much higher than, for example, those for EVA types, and since the range between application and setting temperatures achievable with polyamides is narrow. Another important feature of polyamide resins in the context of this application is the low melt viscosities achievable, thus ensuring rapid spreading and wetting of the molten film.