Uticaj parenja na kvalitet sušenja i boju rezane građe bukve

Abstract

U radu su prikazani rezultati analize uticaja tzv. blagog parenja na konvencionalno sušenje i boju tako osušene rezane građe bukve. Osušena je šarža koja se sastojala od parenih i neparenih dasaka. Praćeni su vlažnost i profili vlažnosti tokom sušenja, a na kraju sušenja su određivani konačna vlažnost, razlika vlažnosti po debljini građe, skorelost i boja. Statistički značajna razlika između parene i neparene građe nije utvrđena ni kod jednog ispitivanog parametra. Rezultati pokazuju da se može očekivati isti (ili čak bolji) kvalitet sušenja parene bukove građe u odnosu na neparenu sušenu istim režimom. Osušena parena rezana građa je imala tamniju boju sa većim učešćem crvene u odnosu na neparenu građu. Utvrđena je nepreciznost merenja vlažnosti parenog i neparenog drveta bukve u sušari u području vlažnosti 7-15% i data preporuka za prevazilaženje ovog problema.

This paper presents the results of an analysis of influence of the 'light' steaming process on conventional drying and colour of beech timber. A stack consisting of steamed and unsteamed boards was dried. Moisture content and moisture content profiles were recorded, and at the end of drying final moisture content, moisture content difference across thickness, case-hardening and colour were determinated. No statistically significant difference between steamed and unsteamed timber was established in any of the examined parameters (MC, ΔMC, gap). The results indicate that equal (or even) better drying quality can be expected with steamed beech timber than with unsteamed timber, given the same drying schedule. Dry steamed timber was darker and more reddish than the unsteamed one. An imprecision of measurement by probes in the kiln was noticed in measuring steamed and unsteamed beech timber having a moisture content of between 7% and 15%, and a solution for overcoming this problem was given.