Bursting Strength Test BST (Bursting Strength Test)
Break strength is the static rupture strength in kpa. Bursting strength can be measured by a burst strength tester. The burst strength of raw materials such as corrugated medium and cardboard is in accordance with the relevant standards. The burst strength of corrugated board can be inferred from the raw materials used. It is equal to the sum of the burst strength of each layer of board paperboard multiplied by a factor of 0.95. Layer independent.
For example, the burst strengths of single corrugated cardboard and double corrugated cardboard are calculated as follows:
Single corrugated cardboard BST=(Paper BST+Paper BST)×0.95
Double corrugated cardboard BST = (Paper BST + BST BST) *0.95
Because there is a gap between the corrugated cardboard boxes in each layer, the buffering capacity increases, but it is more easily broken by each, so in the above formula, the sum of the bursting strengths of the cardboard boxes in each layer is multiplied by a coefficient of 0.95. The actual situation is consistent. The burst strength is not related to the corrugated layer because, on the one hand, the corrugated layer has much lower burst strength than the boxboard. On the other hand, because the burst strength is a static burst resistance, the corrugation layer has a greater buffer, and thus greatly Reduce its burst strength so that it is negligible.
Puncture Energy Test PET
The puncture strength is the dynamic burst strength in joules (J). It truly reflects the impact of corrugated cardboard and cartons. The determination of the puncture strength is more complicated than the burst strength because it is not only related to the linerboard but also to the corrugated layer. Puncture strength and burst strength are both linearly correlated. In actual estimation, the approximate puncture strength can be obtained based on burst strength. The formula is as follows: PET = 0.0054BST + 2.16358 Edge Crush Test of Corrugated Fiberboard and Ring RCT (Ring Crush Test) The edge crush strength is the edge compression strength of the corrugated board, in units of N/m. Ring pressure RCT mainly refers to the transverse compressive strength of linerboard and corrugated paper, in units of N/m. Corrugated paperboard side pressure strength and boxboard paper and corrugated paper ring pressure strength RCT, calculated as follows:
Single Corrugated Cardboard ECT=Rough Paper RCT+Rectangle RCT+Corrugated Paper RCT×Rate Double Corrugated Cardboard ECT=Rough Paper RCT+Paper RCT+Rice Sandwich RCT+First Corrugated Paper RCT×Responsive Bursting Rate+Second Corrugated Paper RCT×Responsive Bursting Rate %
Some foreign packaging scientific research institutions have concluded a series of calculation formulas through a lot of research work. A packaging scientific research institution in Finland has made a lot of tests, and the results obtained have been representative of the actual situation. It believes that the edge pressure of corrugated board can be expressed as follows:
A type single corrugated cardboard ECT=1.0(Rough paper RCT+RCT+Corrugated paper RCT×Rate)
B type single corrugated cardboard ECT=1.1 (Rough paper RCT+RCT+Corrugated paper RCT×Rate)
C type single corrugated cardboard ECT=1.1 (Rough paper RCT+RCT+Corrugated paper RCT×Rate)
AB Double Corrugated Cardboard ECT=Rough Paper RCT+1.1×Ripe Paper RCT+1.05×Ribbon Paper RCT+A Corrugated Card RCT×Corrugated Rate+B Corrugated Paper RCT×Responsive Bursting Ratio×1.1BC Double Corrugated Cardboard ECT=1.1×(Paper) RCT + paper RCT + core paper RCT + A corrugated paper RCT × corresponding rate + B corrugated paper RCT × corresponding rate)
Note: The calculations by this formula are actually biased.
