Differentiation of Processing Methods of Pumped Wood

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UDС

674.41

DOI:

10.17238/issn0536-1036.2017.3.143

Abstract

The feasibility of wood processing containing heart rot is substantiated in the article. The subject of research is the processing methods of wood with heart rot. Hardwood and coniferous wood with good strength and heat insulating parameters, is in high demand. As a result, the raw stock of this wood in the European part of the country is constantly decreasing. Deficiency of hardwood and coniferous wood requires the involvement of nonmerchantable wood into processing. The existing approach to choosing the method of its processing is determined only by the type of the used equipment. In the sawmill production, the heart rot is often removed by sawing of double flat-faced cants or heart boards. In the plywood production, billets with a rot diameter of up to 100 mm are processed on peelers with a cam diameter of outer spindles of 110 mm. Wood with heart rot is used for the production of plate materials, but the total content of decay in wood chips should not exceed 5 %. Often wood with heart rot is sawed for firewood for sale to the population. The approach differentiation for choosing the processing method of wood with heart rot is to justify the type of obtained materials and products of various functional purposes, depending on its size. The following methods of wood processing are proposed in accordance with the rot gradation by diameter: up to 50 mm ? drilling of heart rot from timber; from 50 to 100 mm ? peeling of a healthy peripheral part of the trunk; over 100 mm ? sawing of cut lumber from timber. To ensure the competitiveness the products made from wood with heart
rot, should have higher performance criteria compared to existing materials and products. Wood materials with heart rot of a diameter of up to 50 mm are most advisable to use for the production of rounded logs, where the useful yield is about 80 %. Drilling a small diameter hole will not result in a significant reduction in the carrying capacity of logs. When processing wood with heart rot of a diameter of 50...100 mm, we propose to use sound wood peeling for the subsequent jointing of plywood products. A universal way of wood processing with heart rot of a diameter of 100 mm and more (and also less than 100 mm) is the production of pallets for platforms.

Authors

A.A. Lukash, Candidate of Engineering Sciences, Associate Professor N.P. Lukuttsova, Doctor of Engineering Sciences, Professor

Affiliation

Bryansk State Engineering Technological University, pr. Stanke Dimitrova, 3, Bryansk, 241037, Russian Federation; e-mail: mr.luckasch@yandex.ru

Keywords

added-value pumped wood processing, plywood, rounded log, flaw in wood.

For citation

Lukash A.A., Lukuttsova N.P. Differentiation of Processing Methods of Pumped Wood. Lesnoy zhurnal [Forestry journal], 2017, no. 3, pp. 143–151. DOI: 10.17238/issn0536-1036.2017.3.143

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