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Drying method of timber for pianos

A drying method and board technology, which can be used in drying solid materials, heating to dry solid materials, drying, etc., can solve the problems of poor drying effect of wood and long drying cycle.

Inactive Publication Date: 2013-08-28
NINGBO LUO PIANOS COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional wood drying process requires the drying temperature to be less than 100°C, the drying medium is humid air, and the drying cycle is long, especially for hard-to-dry hardwood species, which generally takes more than 20 days and nights; while the normal pressure superheated drying process requires a dry bulb thermometer The temperature of the wet bulb thermometer is between 100-135°C, and the temperature of the wet bulb thermometer is between 98-100°C; that is, the saturation temperature is continued to be heated under normal pressure to form superheated steam at normal pressure in the drying kiln to dry the wood. Although the drying cycle of this method is short, the drying effect of the wood is not good, especially the board applied to the piano

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1, a kind of drying method of piano plate, described steps are:

[0011] a. Put the selected plate into the drying kiln and heat it up. When the temperature rises from room temperature to 55°C dry bulb temperature and 47°C wet bulb temperature, preheat the plate;

[0012] b. Raise the plate to the predetermined processing temperature at a rate of 20°C / h dry bulb temperature and 16°C / h wet bulb temperature, keep the predetermined time for 4 hours and then start to cool down;

[0013] c. When the dry bulb temperature drops to 65°C and the wet bulb temperature is 57°C, maintain the medium condition, carry out humidity adjustment and balance treatment, and cool down and leave the kiln when the moisture content of the board is adjusted to 7% to 9%.

Embodiment 2

[0014] Embodiment 2, a kind of drying method of piano plate, described steps are:

[0015] a. Put the selected plate into the drying kiln and heat it up. When the temperature rises from room temperature to 58°C dry bulb temperature and 49°C wet bulb temperature, preheat the plate;

[0016] b. Raise the plate to the predetermined processing temperature at a rate of 20°C / h dry bulb temperature and 16°C / h wet bulb temperature, keep the predetermined time for 5 hours and then start to cool down;

[0017] c. When the dry bulb temperature drops to 68°C and the wet bulb temperature is 60°C, maintain the medium condition, carry out humidity adjustment and balance treatment, and cool down and leave the kiln when the moisture content of the board is adjusted to 7%.

Embodiment 3

[0018] Embodiment 3, a kind of drying method of piano plate, described steps are:

[0019] a. Put the selected plate into the drying kiln and heat it up. When the temperature rises from room temperature to 60°C dry bulb and 50°C wet bulb, preheat the plate;

[0020] b. Raise the plate to the predetermined processing temperature at a rate of 20°C / h dry bulb temperature and 16°C / h wet bulb temperature, and start to cool down after keeping the predetermined time for 6 hours;

[0021] c. When the dry bulb temperature drops to 70°C and the wet bulb temperature is 62°C, maintain the medium condition, carry out humidity adjustment and balance treatment, and cool down and leave the kiln when the moisture content of the board is adjusted to 8%.

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PUM

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Abstract

The invention discloses a drying method of panel for pianos. The method comprises the following steps: a, putting selected panel in a drying kiln to preheat the panel when the temperature rises to a dry-bulb temperature between 55 and 60 DEG C and a wet-bulb temperature between 47 and 52 DEG C from a room temperature; b, heating the panel to a predetermined treating temperature at a rate of dry-bulb temperature 20 DEG C / h and a wet-bulb temperature 16 DEG C / h, maintaining the temperature for a given time of 4 to 8 hours and then cooling the panel; and c, maintaining the medium condition when dry-bulb temperature drops to between 65 and 70 DEG C and wet-bulb temperature drops to between 57 and 62 DEG C so as to carry out humidifying equalization treatment, and then cooling the panel for unloading when panel moisture content is adjusted at 7 to 9 percent.

Description

technical field [0001] The invention relates to a wood drying process method, in particular to a drying method for piano boards. Background technique [0002] There are two main types of existing wood drying processes, one is the conventional wood drying process, and the other is the normal pressure superheating drying process, using steam as the heat source. The conventional wood drying process requires the drying temperature to be less than 100°C, the drying medium is humid air, and the drying cycle is long, especially for hard-to-dry hardwood species, which generally takes more than 20 days and nights; while the normal pressure superheated drying process requires a dry bulb thermometer The temperature of the wet bulb thermometer is between 100-135°C, and the temperature of the wet bulb thermometer is between 98-100°C; that is, the saturation temperature is continued to be heated under normal pressure to form superheated steam at normal pressure in the drying kiln to dry t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27K1/00F26B3/02
Inventor 冯岳飞吴智慧蔡家斌徐伟李涛张超华张开丰
Owner NINGBO LUO PIANOS COMPANY