Experiment on water absorption expansion rate of super core plate

Experiment on water absorption expansion rate of super core plate

Experiment on water absorption expansion rate of super core plate

Many people will worry about the problem of water absorption expansion deformation of plates. Today's experimental class brings the water absorption expansion rate experiment. The two protagonists are super core plate and particle plate.

Material preparation: super core board * 6, particle board * 6, steel ruler * 1, iron basket * 1, low-temperature thermostatic bath * 1, marking pen * 1, thickness gauge * 1

Step 1: number 12 experimental plates 1-12 with a marker pen (No. 1-6 is super core plate, No. 7-12 is particle plate), super core plate is one group, and particle plate is two groups.

Step 2: mark the center point on the front of each plate with the help of a steel ruler.

Step 3: debug the measuring instrument, measure the thickness of each plate before water absorption at the center point, and make records

Step 4: Put the experimental plates into the iron basket, and put the iron basket containing the plates into the low-temperature thermostatic bath. The water temperature in the instrument is 20 ℃, and leave the plates in the water for 24 hours.

Step 5: Take out the experimental plate after 24 hours.

Step 6: Measure the thickness of the central point of the plate after water absorption, make records, and calculate the water absorption expansion rate of each plate.

Conclusion: According to the calculation, the water swelling rate of the super core board is 3.1%, the water swelling rate of the particle board is 18.0%, and the water swelling rate of the super core board is recognized. By comparing the thickness of the super core plate and the particle plate after the test, it can be clearly seen that the water absorption expansion rate of the particle plate is much higher than that of the super core plate

The difference between core board and solid wood multilayer board is 1. Environmentally friendly multilayer board: most of them can reach E1 level, because there is not so much glue, generally they are qualified as long as they reach E1 level. Although the environmental protection cannot be compared with the solid wood board, it also conforms to the national standard; Solid wood core board: blockboard, as we say, is a large core board, which is formed by gluing and splicing the boards between two veneer boards. The middle board is made of wood boards processed into wooden strips of certain specifications and spliced by a splicing machine. This formaldehyde emission is still very high. 2. Among the boards of the same brand and thickness, multilayer solid wood boards are more expensive than large core boards, mainly because the number of layers of multilayer solid wood boards is determined by the number of sheets added, while the large core boards are determined by the thickness. 3. Multilayer board with practical performance: solid wood board has the advantages of good bending resistance, high strength, durability, good decorative effect, etc. Solid wood adopts traditional technology, rarely using nails, glue, etc; Solid wood core board: mainly adopts nails, and is also suitable for simple adhesive pressing process. Its own stability is worse than that of other plates, which is caused by the consistency difference of its core material, which may increase the deformation of the thin core plate. Therefore, thin core boards are not suitable for one-sided parts, such as cabinet doors