Preparation of Composite Board Using Foil- and Plastic- Laminated Liquid Packaging Paperboard as Raw Materials

We investigated the properties of composite board formed using base sheets of aluminum foil- and polyethylene (PE) plastic-laminated liquid packaging paperboard (LP) as an alternative to recycling these items in wastepaper stream. Boards of different specific gravities ranging from 0.55 to 0.75 were made by pressing shredded LP blended with urea resin having resin content of 6% to 10% at 180℃. Subsequently, we also prepared mixed particleboard (wood (WD) particles and LP mixed), 3-layered particleboard (with LP as the middle layer; WD in the upper and lower layers), and wood particleboard all having resin content of 10% and various specific gravities. Static bending and internal bonding strengths and thickness swelling of the specimens were carried out to examine their properties. At the same specific gravity, the properties of LP particle- boards were affected by their resin content. The modulus of rupture (MOR), modulus of elasticity (MOE) and internal bond of the LP particleboards increased with increasing specific gravities of the boards at the same resin content, but thickness swelling of the LP particleboards showed a reversed trend. The average MOR of the LP particleboards approximated that of the mixed particleboards and was greater than those of the 3-layered particleboards and wood particleboards. Internal bond and thickness swelling of the LP particleboards were smaller than those of the other particleboards. Based on the above observations, we deemed that LP can be made into composite boards of adequate properties either alone or mixed with wood particles.