Features of Density Meter Wood Air Dry Density Test
Wood always has varying amounts of moisture inside it, with wet wood being heavier and dry wood being lighter. This means that the weight of the same type of wood with the same appearance depends on its moisture content. Exact weight is critical for shipping planning and maximizing truck weight. The wood density we usually refer to refers to the basic density of wood. Since the volume and quality of wood will change with the change of wood moisture content, the density of wood refers to the density of a certain moisture content. Commonly used are full dry density, air dry density and basic density. In practical applications such as production and distribution trade, the air-dry density is commonly used as an indicator. Today we will test the air-dry density of plywood with the Qunlong Density Meter and the Sealing Wax Method.
Features and Devices of Wood Density Meter
1. Gold-plated ceramic capacitive sensor
2. Density direct reading, minus cumbersome calculations
3. Standard RS232 data transmission function, easy to connect PC and printer
4. Fully automatic zero point tracking, buzzer alarm, overload alarm function
5. The mass of the measured object in the air is >0.25g
6. The buoyancy received by the measured object in the air is <-0.125
7. Dimensions: 270*200*265, weight: 6.5kg
8. Dimensions of one-piece sink: 165*115*85
9. Blue backlit LCD display
Wood Density Meter Technical Parameters
Model: BOS-300A
Weighing accuracy: 0.005g
Weighing range: 0.005g~300g
Density analysis: 0.001g/cm3
Density range: >1, <1 can be measured
Measuring time: about 10 seconds
Setting: temperature compensation setting, solution compensation setting
Functions: weight, density, volume
Wood air-dry density (sealing wax method) test steps:
1. Install the density meter and wax sealing machine, and turn on the power;
2. Set the Qunlong densitometer to solid mode, put the anti-floating frame in the water tank, and press the tare button;
3. Take a little paraffin in the wax sealing machine, after the paraffin solidifies and cools down, put it on the weighing rack of the density meter, weigh its mass in the air to be 9.190g, press the MODE key to record;
4. Put the wax block into the water tank, because the wax will float on the water surface in the water, so put it under the anti-floating rack, weigh its mass in the water as -1.285g (buoyancy), record according to MODE, the instrument will automatically The calculated wax block density is 0.875g/cmᶾ;
5. Modify the data about the wax density in the density meter to 0.875g/cmᶾ, and adjust the solid mode to the sealing wax method mode;
6. Put the wood on the weighing rack and weigh its weight in the air as 2.405g, press the MODE key to record;
7. Prick the plywood with a needle, completely immerse in the wax oil melted by the wax sealing machine, so that the wax completely wraps the plywood, take out the plywood wrapped by wax, wait for it to cool, then place it on a weighing rack, and weigh the sealed plywood. The mass of the waxed plywood in the air is 5.325g, press the MODE key to record;
8. Put the wax-sealed wooden block into the water tank, because it will float on the water surface in the water, so put it under the anti-floating rack, weigh its mass in the water as -1.795g (buoyancy), press MODE Record, the instrument automatically calculates that the air-dry density of the plywood is 0.632g/cmᶾ;
Precautions:
1. Before the test, the density of the wax should be clarified;
2. Be careful not to have air in the wax and the sample to be tested during the wax sealing process, otherwise it will affect the test results;
3. When the product is put into water for testing, attention should be paid to whether the test sample has air bubbles in the water. If there are, use a burette to absorb the air bubbles;
