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Vacuum drying method for phoebe zhennan board

A technology of vacuum drying and nanmu, which is applied in the direction of wood drying, preliminary treatment to promote the drying of solid materials, and drying of solid materials. The effect of moisture

Inactive Publication Date: 2017-08-11
SICHUAN AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above existing prior art, the present invention provides a vacuum drying method for nanmu boards, which can effectively solve the problems of cracking and deformation of boards and long drying period during the drying process

Method used

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  • Vacuum drying method for phoebe zhennan board
  • Vacuum drying method for phoebe zhennan board
  • Vacuum drying method for phoebe zhennan board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment adopts 1000mm (length) * 100mm (width) * 30mm thick nanmu plank to carry out vacuum drying, and concrete steps are as follows:

[0024] (1) The 30mm thick nanmu boards are separated and stacked in the drying equipment by pads; preheated with 100°C saturated steam, the preheating time is 4.5 hours;

[0025] (2) Start vacuuming when the temperature of the wood core layer is naturally cooled to 50°C. The absolute pressure in the equipment is controlled to 0.008MPa. Stop vacuuming after about 30 minutes of vacuuming, and open the vacuum valve to release the vacuum, so that the drying equipment returns to normal pressure. ;

[0026] (3) Heating the wood, using 60°C steam heating, the dry bulb and wet bulb temperatures of the psychrometer are controlled at 60°C and 55°C respectively, when the temperature of the wood center layer reaches 50°C, stop heating, and the fan continues to run for 30 minutes;

[0027] (4) Vacuumize for 30 minutes, control the absolute...

Embodiment 2

[0033] This embodiment adopts 1000mm (length) * 100mm (width) * 30mm thick nanmu plank to carry out vacuum drying, and concrete steps are as follows:

[0034] (1) The 30mm thick nanmu boards are separated and stacked in the drying equipment by pads; preheated with 100°C saturated steam, the preheating time is 4.5 hours;

[0035] (2) Start vacuuming when the temperature of the wood core layer is naturally cooled to 50°C. The absolute pressure in the equipment is controlled to 0.012MPa. Stop vacuuming after about 30 minutes of vacuuming, and open the vacuum valve to release the vacuum, so that the drying equipment returns to normal pressure. ;

[0036] (3) To heat the wood, use 60°C steam to heat it. The dry bulb and wet bulb temperatures of the psychrometer are controlled at 60°C and 55°C respectively. When the temperature of the wood center layer reaches 50°C, stop heating, and the fan continues to run for 30 minutes;

[0037](4) Vacuumize for 30 minutes, control the absolute...

Embodiment 3

[0043] This embodiment adopts 1000mm (length) * 100mm (width) * 30mm thick nanmu plank to carry out vacuum drying, and concrete steps are as follows:

[0044] (1) The 30mm thick nanmu boards are separated and stacked in the drying equipment with pads; preheated with 100°C saturated steam for 4.5 hours.

[0045] (2) Start vacuuming when the temperature of the wood core layer is naturally cooled to 50°C. The absolute pressure in the equipment is controlled to 0.008MPa. Stop vacuuming after about 30 minutes of vacuuming, and open the vacuum valve to release the vacuum, so that the drying equipment returns to normal pressure. ;

[0046] (3) Heating the wood, using 50°C steam heating, the dry bulb and wet bulb temperatures of the psychrometer are controlled at 58°C and 55°C respectively, when the temperature of the wood center layer reaches 45°C, stop heating, and the fan continues to run for 20 minutes;

[0047] (4) Vacuumize for 30 minutes, control the absolute pressure in the e...

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Abstract

The invention discloses a vacuum drying method for a phoebe zhennan board. The vacuum drying method comprises the steps of preheating, steam heating, vacuumization, humidification treatment and the like. The preheating time is proportional to the board thickness. In the step of steam heating, the steam temperature is 50-70 DEG C, and a psychrograph is introduced into the process to monitor the humidity in a drying device. The vacuum degree of the drying device is kept at 0.008-0.012 MPa during vacuumization. When humidification treatment is conducted, the vapor temperature is 55-60 DEG C, the temperature difference of the psychrograph is controlled to be 5-6 DEG C, and the treatment time is 10-20 h. By adoption of the drying steps, the phoebe zhennan board cannot crack, color changes are small, the drying time is short, and the drying quality is high.

Description

technical field [0001] The invention relates to a wood treatment method, in particular to a vacuum drying method for nanmu boards. Background technique [0002] Phoebe is a precious tree species used in furniture in my country. Phoebe drying is a necessary link in the furniture manufacturing process. The quality of drying determines the utilization rate of Phoebe, and even affects the cracking and deformation during subsequent use. [0003] At present, the commonly used method of drying nanmu is conventional steam drying, and the drying speed is slow. In order to increase the drying speed, it is usually achieved by increasing the drying temperature. On the one hand, the increase in temperature will make the nanmu wood lose its original material color, and at the same time, the high temperature will cause the wood to crack and deform. The probability of drying is greatly increased. The utilization rate of nanmu wood dried by this method is not high, and the color changes grea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B1/00F26B5/04F26B21/14F26B25/22
CPCF26B1/00F26B5/04F26B21/14F26B25/22F26B2210/16
Inventor 肖辉陈玉竹徐善峰杨丽邵慧娟
Owner SICHUAN AGRI UNIV
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