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Analysis of the process of combustion of post-consumer wood using quantitative assessment indicators

100%

Kajda-Szcześniak M. , Jaworski T. J.

tom vol. 59, nr 196

91--107

The paper presents an analysis of the fuel and emission properties of selected types of post-consumer wood. The tested materials include flooring, wood door frames, and used furniture, as well as wood as a material for comparison. In addition, through the results of tests carried out in the laboratory, the paper presents possibilities related to the optimization of waste combustion plants equipped with combustion chambers with mobile grates. For this purpose, indicators of quantitative assessment were determined, i.e. the reaction rate, the fire point, mass loss during combustion, and the heat load of the grate.

Characteristic of post-consumer wood chips and particles used in particleboard production. Part II.

72%

Janiszewska D. , Frąckowiak I. , Andrzejak C.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2014

tom No. 87

75--78

Characteristic of post-consumer wood chips and particles used in particleboard production. Part II. The article presents the results of further research aiming at characteristic of post-consumer raw material obtained in industrial conditions, as described in Part I. This part presents the properties of post-consumer wood chips and obtained particles, such as formaldehyde content, pH and buffer capacity of particles. The sand content in tested chips was determined as well. The studies were carried out in comparison to pine wood.

Study of Physical and Mechanical Properties of Post-Consumer Wood of Different Age

72%

Gayda S. , Kiyko O.

tom Vol. 66, nr 212

Art. no. 177453

It should be noted that there is currently a problem with wood resources in the woodworking industry. A potential, unused wood reserve is post-consumer wood (PCW). The problem with the quality of this wood resource has not been fully resolved since there is no regulatory database. In fact, there is a lack of appropriate regulatory documents, which makes it impossible to describe to a full extent the physical and mechanical properties of PCW of common wood species of different ages as a source of additional raw materials for various woodworking technologies. Proceeding from the goal, the task of the study is to describe the physical and mechanical properties of postconsumer wood using the example of fir wood, which for a long period of time has been used to create furniture and joinery products. The task is also to identify patterns of change in the indicators of this resource with age - an expired service life or suitability. In order to use PCW in woodworking and to fill the scientific base with physical and mechanical indicators of fir wood of different ages with an expired product service life, the following characteristics were investigated: static hardness, swelling, coefficients of swelling, the value of transverse anisotropy, density, static bending strength, splitting strength along the fibers, modulus of elasticity in compression, and the modulus of elasticity in static bending. The characteristics of PCW of the widespread fir species in the range of use from 0 to 20 years were explored, with intermediate control over the properties every 5 years. The dynamics of the physical and mechanical indicators of fir PCW were revealed and it was found that in the course of operation time in various conditions they change, mainly decreasingly: static hardness by 9.2-9.6%; the value of transverse anisotropy by 30-32%; strength: static bending strength by 3.4-7.95%, splitting strength by 4.49-8.67%; modulus of elasticity: in compression by 3.89-4.08%, in bending by 2.75-6.64%. The main causes of changes in the properties of PCW with age: natural: weathering, partial internal rot, insect damage, other biological effects; mechanical: splitting, scratches, small holes from means of fastening and other defects due to use; operational: the influence of power and dynamic loads, the influence of surface finishing agents and other factors on the structural elements of wood products. A summary table was compiled for the selection of indicators of the physical and mechanical properties of fir PCW of different ages. When knowing the indicators and dynamics of the physical and mechanical properties of PCW with age, it can be recommended for manufacturing structural materials - blockboards and furniture panels.