Medium-density fibre board

Mohamed, A. R. (2010). Development and material properties of new hybrid medium density fibre board from empty fruit bunch and rubber wood, 31(9), 4229-4236. 

Adhesives of the aminoplastic (see Step polymerization) and phenol formaldehyde (see Phenolic adhesives single-stage resoles and Phenolic adhesives two-stage novolacs) types are most widely used. Although basically similar, an adhesive for plywood manufacture will require a different formulation to one for particle board, or medium-density fibre board (MDF) since methods of application and processing differ. Thus, in plywood, large sheets of veneer must be uniformly coated with adhesive, usually by a roller or curtain coater in particle board, chips or wafers must be coated with very fine adhesive droplets, while small bundles of wet fibres must be sprayed with adhesive in the manufacture of MDF. Hence, formulation and production of resins has become a mixture of art and science, with resin manufacturers able to produce resins tailored for use in a particular board-manufacturing plant, or with a particular species of timber. 

Technical lamination in automotive and furniture industry is used to bond decorative films onto preformed hard substrates, for example, printed PVC films on dashboards or medium density fibre boards. Mainly adhesives based on polyurethane dispersions are used, which provide excellent adhesion and extremely high bond strength. 

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