1.1: Edge compressive strength: along the corrugated direction, the maximum force that corrugated cardboard per unit length can bear before pressing. Unit: N/m.
Edge Crush Strength=Comprehensive Ring Crush Strength of Surface Base Paper+Comprehensive Corrugated Paper Ring Crush Strength*Shrinkage Rate
Generally, the side pressure calculation is calculated according to the minimum ring pressure strength of the base paper (safe and reliable), and the actual test value will be appropriately larger than the theoretical calculation value.
1.2: Bursting strength: the maximum external force that corrugated cardboard can withstand uniformly increased per unit area before it breaks. Unit: Kg/cm2.
Cardboard burst strength = face paper burst strength + medium paper burst strength + bottom paper burst strength
*Because there will be a certain strength loss during the manufacturing process, the actual rupture strength of the test will be less than the calculated value of about 1 Kg/cm2.
1.3: Puncture strength: The new national standard GB6544-1999 has cancelled the requirements for puncture strength of cardboard. (Original standard GB6544-1986)