Of annatto lumber dry it is one of annatto furniture production process important process. It can be divided for the following measure.
1 warm-up is handled
After material piles loading of kiln, beginning dry before, should undertake warm-up is handled normally, the purpose is right lumber heats, raise the temperature of lumber core layer, after so that be in,entering dry phase, can quicken in-house moisture to move to the surface. Do capable person compatibly to doing capable person partly, warm-up processing still can eliminate sawn timber to do the exterior tension that produces in the process in gas. To wet material and raw material, warm-up processing can make the lumber of moisture content on the high side evaporates one part moisture, make moisture content tends first even. Warm-up processing still can reduce the viscosity that fiber saturation is nodded and reduces moisture content, the surface layer that makes half gas does material to do capable person compatibly is capillary diastole, raise the conductibility of moisture thereby.
Warm-up processing can divide a pace to undertake. Make medium temperature lifts above all 40, 45 ℃ , maintain half hours to arrive 1 hour, make the equipment inside kiln and kiln wall and lumber surface heat, lest be when tall wet process,be in these apparently generation condenser water. Undertake warm-up is handled again next, it basically passes gush evaporate, or gush evaporate and heat to be united in wedlock, the medium condition that makes lukewarm, humidity lifts place asks at the same time, hold proper time, make lumber fully hot.
Annatto is dry it is convention of a kind of low temperature dry, its warm-up temperature should be compared fiducial the temperature of the first phase is high 5 ℃ ; Relative humidity, controallable difference of temperature of dry wet ball is 1, 3 ℃ , new sawn timber or first when moisture content is higher, difference of temperature of dry wet ball should slant small, namely humidity on the high side; Do capable person partly or enrage dry material, difference of temperature of dry wet ball slants big, namely humidity on the low side. Total principle is to make great majority lumber maintains both neither dry warm-up also does not undertake below the circumstance of moisture absorption.
The time of warm-up should make the central temperature of lumber not under medium temperature of the regulation 3 ℃ are accurate, can press method of the following experience to estimate, material every are thick 1cm, time is maintained 1.3, 1.5 hours, winter can be lengthened again 50% , 100% .
After warm-up ends, answer to fall the lukewarm, humidity of medium to be worth to the regulation of fiducial and corresponding phase, enter dry phase namely.
2 intermediate processing
Sawn timber does the early days of the process to be able to produce exterior tensile stress in kiln, serious when can cause a watch to crack, and medium, later period can appear case hardening, serious when can cause inside crack. Be handled among even if be in kiln dry process in order to eliminate the air wet process of surface layer tensile stress and case hardening. Carry opposite high temperature tall wet process namely, make lumber surface layer sufficient embellish is wet raise plasticity, can eliminate consequently dry stress reconciles except case hardening, still can make surface layer capillary at the same time diastole and gradient of slow down moisture content, with benefit at continueing dry. Enter via turning again after intermediate processing dry when, inside proper time, dry speed is accelerated apparently and won't cause the loss of lumber.
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