Structural Boards Made of Hydrodynamically Activated Pine (Pinus sylvestris) Bark without Binders
Journal Title: Lesnoy Zhurnal (Russian Forestry Journal) - Year 2024, Vol 5, Issue 5
Abstract
Bark is a large-tonnage waste in a number of wood processing technologies requiring efficient use. One of the promising areas of bark use is the production of boards without synthetic binders. Research has been conducted on the production of structural boards from Pinus sylvestris bark without a binder. The method is based on preliminary hydrodynamic activation of bark. The initial bark undergoes primary crushing in a hammer mill. After that, it is mixed with water at a concentration of 6 %. Then the resulting mass is activated in a rotary pulsation disperser, a carpet is formed from it, cold pressing is carried out, and then hot pressing. As a criterion for assessing the degree of mass activation, water-retaining capacity is adopted. The dependencies have been determined between the duration of treatment and water-retaining capacity, as well as the strength of the boards and water-retaining capacity. The latter made it possible to obtain the optimal value of the water-retaining capacity equal to 290 %. A multifactorial experiment has been conducted to develop the optimal hot pressing mode. As a result, the optimal mode for pressing the boards has been determined: temperature â 190 °C; specific process duration â 2.8 min/mm; pressing pressure â 4.4 MPa. The properties of the boards produced in this mode are: density â 980 kg/m 3 ; bending strength â 24 MPa; swelling during soaking for 24 hours â 5 %; water absorption â 9 %. After soaking and subsequent drying to a moisture content of 5 %, the boards retain 75 % of their before soaking. In this case, the geometric dimensions return to the original ones. The resulting boards can be used as a sheet finishing and structural material, in house-building (as a base for floor and roofing materials), in furniture production, especially in severe temperature and humidity conditions. The conducted research shows the possibility of producing board materials with high performance properties from pine bark without binders.
Authors and Affiliations
Vladislav D. Eskin, Vladimir N. Ermolin, Anna I. Krivorotova
Keywords
Related Articles
- EP ID EP750044
- DOI 10.37482/0536-1036-2024-5-175-187
- Views 71
- Downloads 0
Comparative Analysis of the Ecological-Floristic Classification and the Russian Forest Typologies
At the beginning of the 20th century in Europe, a scientific direction was formed, called phytosociology, the founder of which was the Swiss botanist and ecologist J. Braun- Blanquet. The approach he developed has become...
Reproductive Indicators of Nasczokinâs Lime (Tilia nasczokinii Stepanov)
Tilia nasczokinii Stepanov (Naszokinâs lime) is endemic to the south of the Krasnoyarsk Territory and is of relict origin. Two of its populations grow in the vicinity of Krasnoyarsk on the left and right banks of the Y...
Dynamics of Biometric and Carbon Indicators of Pine Plantations Growing on the Abandoned Farmlands of the Krasnoyarsk Forest-Steppe
Today, the overgrowth of woody and shrubby vegetation on former agricultural lands is a serious problem. The aim of this research has been to investigate age-related changes in the forest inventory indicators of forest s...
Post-Fire Changes in Light Coniferous Forests of the Bashkir Nature Reserve
The assessment of the impact of fires on forest plantations in order to obtain information on the post-pyrogenic development of forest components over time is becoming increasingly relevant due to the increasing number o...
Biometric Parameters of Planting Material as a Test Indicator of Success of Pinus silvestris L. Plantations
The creation and cultivation of artificial plantations of conifers largely depends on the planting material quality. The paper is devoted to the study of the relationship between the main parameters of planting material...