Abstract
This study analyzed feasibility of manufacture of composite particleboards resinated with a mixture of phenol–formaldehyde resin and 4,4′-methylenediphenyl isocyanate in the weight ratio 70:30. For this purpose 3-layer particleboards were produced with varying shares of Kraft scrap paper pulp in the core. Experimental boards were manufactured applying 0, 10, 15, 25, 50 and 75% substitution of wood chips with Kraft paper pulp. Analyses were conducted to determine physico-mechanical properties of boards, i.e. bending strength, modulus of elasticity, internal bond before and after the boiling test and swelling in thickness after 24 soaking in water. Based on recorded testing results it was stated that moisture resistant composite boards manufactured with a 25% substitution of wood chips with Kraft paper pulp meet the requirements of the EN 312 standard for boards used in humid conditions in terms of their strength and moisture resistance specified in the internal bond after the boiling test.
Highlights
Requirements of sustainable wood management make it necessary to search for alternative raw materials for manufacture of particleboards
A review of literature on the application of paper waste in particleboard production shows that in most studies amine resins and pMDI were used. For this reason the authors of this study investigated the potential production of such particleboards using phenol-formaldehyde (PF) resin and 4,4′-methylenediphenyl isocyanate
Summing up it may be stated that moisture resistant composite boards may be produced with a share of Kraft paper as a partial substitute of wood chips in the core of particleboards.The application of such waste in the manufacture of particleboards, despite their resination with a mixture of PF resin and pMDI, considerably reduces physico–mechanical properties of tested composite boards
Summary
Requirements of sustainable wood management make it necessary to search for alternative raw materials for manufacture of particleboards. Its application is connected with certain problems when used in commercial scale production processes. The specific character of methods applied to harvest annual crops results in relatively large amounts of mineral contamination originating e.g. from the soil. This requires additional operations in the preparation of stock materials for the manufacture of particleboards in order to purify the raw material
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