6.9.1 Water-Based Adhesive Chemistries

Normally, water-based adhesives have no cure mechanism because curing is only a drying process: the product bonds when the water evaporates. There are several different chemistries – both natural-based and synthetic-based materials – which include the following:

6.9.1.1 Vinyl Acetate Monomer (VAM) - Based Emulsions (EVA or PVA Emulsions)

Polyvinyl Acetate Emulsions (PVAs) are used mainly for porous substrates such as wood (furniture), board (boxes manufacturing) and lamination (corrugated board manufacturing). The product bonds in a mechanical way, penetrating into the fibre of the substrate.

Figure 198 (a) Board lamination
(b) Finger joint assembly

Some paper manufacturers use coatings to impart water resistance to paper. For such paper, EVA-based adhesives are more suitable than PVA-based adhesives. EVA-based emulsions are used for difficult substrates, including water resistant paper, PVC and medium-density fiberboard (MDF).

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