Автор: Petar Antov

Статии

STRATEGIC PERSPECTIVES OF BULGARIAN PLYWOOD PRODUCTION AND TRADE

Автори: Nikolay Neykov, Petar Antov, Veselin Brezin

Резюме

Plywood manufacturing is one of the most important production lines and value adding alternatives in woodworking industry. Plywood production volumes have increased rapidly in the last few years all over the world and especially in Asian countries. In this new environment the European manufacturers face a great competition. In these market conditions the manufacturing companies can either do better, extracting the best they can and providing much greater quality, or go down to slow and painful market dropout. Bulgaria is on the crossroad- to improve its plywood production in terms of investments and quality, or let its manufacturers in stagnation, waiting until their doors get closed. All these facts define strategic analyses that can outline the future improvement of Bulgarian plywood production as a question of present interest for the woodworking industry.

Ключови думи: plywood, Bulgaria, strategies, analyses, matrices

EN Version

FORMAL-ANALYTICAL DESCRIPTION OF WOOD FOR THE PURPOSES OF THE CLASSIFICATION OF WOOD SPECIES. PART 1: QUANTITATIVE LEVELS

Автори: Nikolai Bardarov, Vladislav Todorov, Petar Antov, Mariana Kaludova

Резюме

Wood is a product of woody plants, formed by a complex of tissues - conductive, mechanical, reserve and secretory. However, it is not just a mechanical mixture of chemical compounds, but a complex biological and physico-chemical system composed of polymers, monomers, made up of cell walls and cell cavities (lumens). The knowledge of its structure allows the tree species to be determined, the conditions under which it is formed, as well as its behavior under different loads.

The paper examines the variation of the quantitative indicators of individual tissues and the possibility of using it to classify individual species.

Ключови думи: structure, levels, vessels, wood rays, fibers, parenchyma

EN Version

THE FORMAL-ANALYTICAL DESCRIPTION OF WOOD FOR THE PURPOSES OF THE CLASSIFICATION OF WOOD SPECIES. PART 2. WOOD FORMULAS

Автори: Nikolai Bardarov, Vladislav Todorov, Petar Antov, Mariana Kaludova

Резюме

The structure of wood can be examined at several qualitatively different levels of consideration (macro, meso, micro and nano). Each of these levels can be considered as a separate, single and relatively independent subsystem in the wood structure. They are determined by the characteristics of the species, the ecology of the global, regional and local habitats. Each of these levels requires a separate, more precise and comprehensive classification. If the quantities and distribution of the main tissues are known, the tree species can be grouped in groups of construction and conclusions can be made about its physical and mechanical properties.

This work examines the possibility for a more in-depth formal-analytical description of the individual tree species and a theoretical representation of wood structure that more adequately reflects its characteristic features.

Ключови думи: wood, structure, levels, vessels, core rays, fibers, parenchyma, wood formulas

EN Version

POSSIBILITIES FOR UTILIZATION OF WASTE WATER AND RESIDUAL WOOD FIBRES IN THE PRODUCTION OF HARDBOARDS

Автори: Viktor Savov, Petar Antov, Nikolay Neykov

Резюме

Despite the continuous introduction of new materials and technologies in the production of wood-based composites, hardboards (HB), remain in the range of wood products, due to their good consumer and exploitation properties. The production of these products is characterized by the intensive consumption of raw materials. In the wet production process, much of the raw material used is taken up by water involved in the formation of the wood-fibre mat. It forms a significant share in the value of the finished product, resulting in a smaller added value. At present, the utilization of wastewater from the production of the HB is unsatisfactory. Its high fibre content creates sludges that can be recycled or thermally utilized. The present study is aimed at reviewing the possible methods of utilizing the wastewater and fibre sludge in it. This will provide the Bulgarian producers with a means of enhancing production efficiency and applying the circular economy principles.

Ключови думи: utilization, wastewater, wood fibres, circular economy

EN Version