Bursting strength: BST (Bursting Strength Test)
Bursting strength is the static bursting strength in kilopascals (Kpa). Bursting strength can be measured by a bursting strength tester.
The bursting strength of raw materials such as corrugated base paper and cardboard meets the relevant standards. The bursting strength of corrugated cardboard can be inferred from the raw materials used. It is equal to the sum of the bursting strength of each layer of boxboard and multiplied by a coefficient of 0.95. irrelevant.
For example, the bursting strength of single corrugated board and double corrugated board are calculated as follows:
Single corrugated cardboard (bursting strength) BST = (face paper BST + inner paper BST) × 0.95
Double corrugated cardboard (bursting strength) BST = (face paper BST + sandwich BST inner paper BST) * 0.95
Because there are gaps between each layer of corrugated cardboard, the cushioning capacity is increased, but it is easier to be broken individually. Therefore, in the above formula, the result obtained by multiplying the sum of the bursting strength of each layer of cardboard by a coefficient of 0.95 is the same as The actual situation matches. The bursting strength has nothing to do with the corrugated layer because: on the one hand, the bursting strength of the corrugated layer is much lower than that of the boxboard; reduce its bursting strength so that it is negligible.
Edge crush strength ECT (Edge Crush Test of Corrugated Fiberboard) and ring crush strength RCT (Ring Crush Test) edge crush strength is the edge compressive strength of corrugated cardboard, unit N/m (N/m). Ring compressive strength RCT mainly refers to the transverse compressive strength of containerboard and corrugated paper, unit N/m (N/m)
The edge compressive strength of corrugated cardboard is related to the ring compressive strength RCT of containerboard and corrugated paper, and the calculation formula is as follows:
Single corrugated cardboard edge compressive strength ECT = surface paper RCT + inner paper RCT + corrugated paper RCT × flute rate
Double corrugated cardboard edge compression strength ECT = surface paper RCT + inner paper RCT + sandwich paper RCT + first layer corrugated paper RCT × corresponding flute rate + second layer corrugated paper RCT × corresponding flute rate%
Some foreign packaging scientific research institutions have summarized a series of calculation formulas through a lot of research work, and a Finnish packaging scientific research institution has done a lot of tests, and the results obtained are representative and very in line with the actual situation. it thinks watts
The edge compression strength of corrugated cardboard can be expressed as follows:
Type A single corrugated cardboard edge compressive strength ECT = 1.0 (surface paper RCT + inner paper RCT + corrugated paper RCT × flute ratio)
B-type single corrugated cardboard edge compressive strength ECT=1.1 (surface paper RCT + inner paper RCT + corrugated paper RCT × flute rate)
C-type single corrugated cardboard edge compressive strength ECT=1.1 (surface paper RCT + inner paper RCT + corrugated paper RCT × flute rate)
Edge compressive strength ECT of AB type double corrugated cardboard = face paper RCT + 1.1 x inner paper RCT
