جستجوی مقالات مرتبط با کلیدواژه "recycling of mdf wastes" در نشریات گروه "صنایع چوب و کاغذ"

In this study, the fibers contained in the medium density fiberboard wastes were recycled using a digester. These fibers were then used to produce cellulose nanocrystals. Morphology, chemical structure and resin residues on fibers were investigated. The acid hydrolysis method was utilized to production cellulose nanocrystals. The properties of nanocrystals made from virgin and recycled fibers were investigated. The results showed changes in the morphology and chemical structure of the recycled fibers. The fibers recycled using digester had better quality as compared to the recycled fibers using conventional recycling method (using autoclave). Elemental analysis showed that after recycling, resin residues remained on the fibers. Due to the shorter duration of heat treatment and the elimination of mechanical separation and better quality of recycled fibers, it can be said that the utilization of digester considered as an efficient method for recycling medium density fiberboard wastes. Investigation of nanocrystalline cellulose properties showed that there was no difference between nanocellulose produced from virgin and recycled fibers and the recycled fibers can be well utilized to production of cellulose nano crystals.

In this study, the utilization of fibers recycled from MDF wastes and waste papers for manufacturing fiberboards was investigated. The proportion of waste paper to recycled fibers from MDF wastes was 70/30 and 50/50. Also the effect of utilization of poly vinyl acetate adhesive on properties of boards was investigated. Boards were manufactured at density of 0.3 g/cm3 and dimension of 30×30×1.2cm. Practical properties of boards including thickness swelling, bending strength, modulus of elasticity and internal bonding were measured. The results showed that the utilization of adhesive can improve all of board properties. Change in proportion of recycled fibers to waste paper had different influences on various properties of manufactured fiberboards. The proportion of 70/30 of waste paper to recycled fibers from MDF wastes led to improving bending strength and modulus of elasticity of fiberboards, while the manufactured boards from proportion of 50/50 had better results about thickness swelling and internal bonding. Overall, it can be concluded that recycled fibers from MDF wastes mixed with waste paper can successfully utilize in producing fiberboards.