CS216258B1 - Method of the dampness treatment of dimension timbers and parts from exotic woods for the music instruments - Google Patents

Description

CZECHOSLOVAK SOCIALIST REPUBLIC (19) DESCRIPTION OF THE INVENTION FOR COPYRIGHT CERTIFICATE 216258 (11) (Bl) (51) Int. Cl.3 B 27 K 5/00 (22) Enlisted 16 10 79 (21) (PV 6995-79) OFFICE AND DISCOVERY OFFICE (40) Published 29 05 81 (45) Published 15 05 84 (75)

Author of the invention KOBERLE MILAN ing., SPÁNO ALOJZ ding., MAJEK MATĚJ, BRATI-SLAVA, ŠVAGR JLRÍ, STŘÍBRNÁ, MAKALOUS ZDENĚK ing., DOU-DLEBY NAD ORLICÍ, MALLÝ RADOMÍR ing., HRADEC KRÁLOVÉ (54) exotic woody parts tools

The invention addresses a method of moisture treatment of cuts and parts of exotic woods of high density, intended for the manufacture of musical instruments.

The so-called moisture treatment method used for these blanks consisted of natural desiccation, which lasted 3-4 years for conventional tools and 5 to 6 years for better quality. Despite the long drying time, but under uncontrollable climatic conditions, surface and internal cracks have often been formed and thus the blanks have been degraded, mainly by the loss of wood resonance properties. Cracking occurred on finished products.

The aforementioned drawbacks are eliminated by the method of moisture treatment according to the invention, the principle of which is that the blanks and sections of exotic woods are heated for 5 hours with a 40 ° C dry thermometer and 37 ° C moist, then dried artificially with a 40 ° C dry bulb temperature. and a wet bulb temperature of from 35 ° C to 29 ° C, which varies with time and is followed by stabilizing air conditioning for 120 days at a dry bulb temperature of 26 ° C and a wet bulb of 17 ° C.

Due to the moisture treatment of the inventive stage and the mode in the individual phases, it is possible to achieve well-treated and dimensionally stabilized blanks. The essence of the second phase of the moisture treatment is that in its course, due to the small moisture gradient of the material and thus uniform drying, stresses occur which would cause cracking. Long-term air-conditioning for constant conditions in an air-conditioned warehouse, the material obtains dimensional stability that is important where wood and metal parts of a musical instrument are combined.

Prílďad prevedenia

The following applies to the individual phases: the temperature of the dry thermometer ts, the temperature of the wet thermometer tva the time τ given in Table 1.

Tab. 1 Phase 2 Phase 3 Phase Drying Stabil. drowse. heating 1. st. 2. st. 3. st. 4. st. 5. st. ts (° C) 40 40 40 40 40 40 26 tv (° C) 37 35 34 33 32 29 17 t (day) 5 hours 10 10-20 20-30 30-50 50-80 120 216258 i. ·: '.

Claims (1)

OBJECT OF THE INVENTION Moisture treatment method for blanks of high density exotic wood parts for musical instruments consisting of three well-defined and consecutive phases, characterized in that the blanks and exotic wood parts are heated for 5 hours at a dry thermometer temperature of 40 ° C and 37 ° C, then artificially dried at a constant dry bulb temperature of 40 ° C and a wet bulb temperature of 35 ° C to 29 ° C, which varies over time, followed by stabilization conditioning for 120 days at dry temperature thermometer 26 ° C and wet thermometer 17 ° C.