1. Introduction
This testing machine is to assess strength or quality of bonding between the particles or fibres at the surface of a wood-based board and the layer below(unfaced panel) or between the coating materials and the underlying board(overlaid wood-based panels).The strength or quality is measured by the tensile load required to pull off a defined surface area of overlaid or unfaced panel.
2. Test
Wood-based panel sample size and quantity: 8 test pieces, each 50mm X 50mm, shall be taken from each wood-based board to be tested.
Test method:
1) A circular groove with inside diameter of 35.7±0.2mm shall be cut into the surface the wood-based panel test pieces(see below figure). For unfaced panels, depth of circular groove is 0.3±0.1mm and for overload wood-based panels, the groove shall not penetrate more than 0.3mm into the wood-based panel.
2) Use a hot-melt adhesive spread evenly across the face of the steel pad. The centring frame is used to position the pad exactly on the test piece. Whilst in the centring frame the pad shall be pressed onto the surface of the wood-based panel test piece. If the wood-based panel to be tested are thinner than 15mm, the wood-based panel test pieces shall be strengthened by bonding a 50mm X 50mm steel plate of at least 10mm thickness to their underside.
3. Technical parameters of testing machine
No. | Item | Spec. |
1 | Max. Load | 50KN |
2 | Resolution of test force | 1/±300000 |
3 | Resolution of displacement | 0.001mm |
4 | Precision of crossbeam displacement | ±0.5% |
5 | Precision of deformation | ±0.5% |
6 | Measuring range of test force | 1%-100%FS |
7 | Relative error of test force | ±1% |
8 | Relative error at zero point | ±0.5% |
9 | Speed of crossbeam | 0.01-500mm/min |
10 | Precision of crossbeam speed | ±1% |
11 | Speed range of load | 0.005%-5%FS/s |
12 | Precision of load speed | When speed is less than 0.05FS/s, precision is within ±1% of set value, when speed is more than 0.05FS/S, precision is within ±0.5% of set value |
13 | Speed of deformation | 0.005%-5%FS/s |
14 | Precision of deformation speed | When speed is less than 0.05FS/s, precision is within ±1% of set value, when speed is more than 0.05FS/S, precision is within ±0.5% of set value |
15 | Stroke of crossbeam | 800mm |
16 | Effective tensile height | 650mm |
17 | Effective test span | 400mm |
18 | Effective compression height | 700mm |
19 | Clamps for round specimen | Ø4-9mm |
20 | Clamps for flat specimen | 0-7mm |
21 | Diameter of compression platen | 100mm |
22 | Voltage and power | 220V±10%, 50Hz, 1KW |
23 | Dimension of main machine | 755X520X1780mm |
24 | Weight of main machine | about 400kg |
