Very good video. Some additional issues to consider: are relative humidity and the time in which the boxes are going to be stored. These variables can affect the result of the McKee formula up to 50% box resistance.
Excelent video! Thank you so much! I have a question: with your experience , generally how much reduce they BCT value with real conditions like HR or palletized?
Nice video 👍🏽, But Generally I have found that the BCT value is less when the box height is more, but the formula doesn't include the box height factor... Can you please explain that?
Hi. This is a good question.... Mckee used a box ration of 2:1:1 for all his test back in the 50's In other words he used boxes that were say, 400mm x 200mm x 200mm. He had to pick on something so settled on this. His equation is based on this premise. If a box it taller or shorter then you have to adjust the BCT data accordingly. Sometimes a box under say 100mm deeper can be stronger yhat one of 200mm. But under say 85mm its gets weaker. Taller than say 400mm it can be weaker. However there is no formula for working this out unless you have done 1000's of tests on boxes of deeper or shorter depths. You have to take an estimated firgure off the BCT from McKee's maths. I usually say 25% off for taller boxes and 15% off shorter than 100mm. However there is a lot more to using this calculation than is shown on this video.
Hello, I am a french student and I have now a scientific project which aims at judging the coherence of using cardboard as a construction material (currently used for the realization of Wikkelhouses). One of the four steps in my approach consists in evaluating the physical resistance of cardboard, and by saying so I mean evaluating qualitatively the maximum strength that the material is likely to receive; however, I do not possess any kind of those ECT machines, and my only option remains to do it handcrafted. So my question is : Is it actually possible to measure the max kgf supported by the cardboard with a handcrafted ECT ? And by handcrafted I mean putting an increasing load on my cardboard (like weights or dictionaries) until it folds, but i doubt about the fact that the real strength received by cardboard identifies as the weight that it supports (With the reaction force of the support) : So how is the Strength on the ECT machine measured ? Thank you in advance for your response :)
I'm trying to found some formulae to calculate this kind of resistence for wood boxes, do you know some? I work with furniture and I'm trying to reduce the thickness of some boards to relieve some weight, but I'm worried about the final resistence.
Thanks @Mazen Mahmoud, From my understanding of the box strength tests, (Mullen/Burst Test, and Edge Crush Test/ECT) the changing paper weight will have a greater effect on the Mullen or Burst Strength. This test is looking for the amount of pressure it takes to burst through the material. With a heavier paper, we may see higher pressures to bust through the material. This of course is not always the case. As for the effects on the ECT rating, the paper weight does matter, but in this test I believe the real factor when it comes to the paper is the fiber used for the different layers. A box rated for 32 ECT for example can hold the same max weight of 65 lbs as a #200 Burst tested box before failing. The burst tested box gets its strength from mass while the ECT box gets it strength from Physics and the Flutes of the Corrugated board. Hope this answers your question! Thanks for watching the video.
Hello, thanks for share video... good job...
Great way to learn the McKee Formula! Thanks Ben
Very good video. Some additional issues to consider: are relative humidity and the time in which the boxes are going to be stored. These variables can affect the result of the McKee formula up to 50% box resistance.
Thank you sir .this video is very useful
Thnk u very much, this video has help me a lot
If you want to greatly increase you Edge Crush Test value staple the edges instead of gluing.
Excelent video! Thank you so much! I have a question: with your experience , generally how much reduce they BCT value with real conditions like HR or palletized?
Nice video 👍🏽,
But Generally I have found that the BCT value is less when the box height is more, but the formula doesn't include the box height factor... Can you please explain that?
Hi. This is a good question.... Mckee used a box ration of 2:1:1 for all his test back in the 50's In other words he used boxes that were say, 400mm x 200mm x 200mm. He had to pick on something so settled on this. His equation is based on this premise. If a box it taller or shorter then you have to adjust the BCT data accordingly. Sometimes a box under say 100mm deeper can be stronger yhat one of 200mm. But under say 85mm its gets weaker. Taller than say 400mm it can be weaker. However there is no formula for working this out unless you have done 1000's of tests on boxes of deeper or shorter depths.
You have to take an estimated firgure off the BCT from McKee's maths. I usually say 25% off for taller boxes and 15% off shorter than 100mm. However there is a lot more to using this calculation than is shown on this video.
Hello,
I am a french student and I have now a scientific project which aims at judging the coherence of using cardboard as a construction material (currently used for the realization of Wikkelhouses).
One of the four steps in my approach consists in evaluating the physical resistance of cardboard, and by saying so I mean evaluating qualitatively the maximum strength that the material is likely to receive; however, I do not possess any kind of those ECT machines, and my only option remains to do it handcrafted.
So my question is : Is it actually possible to measure the max kgf supported by the cardboard with a handcrafted ECT ? And by handcrafted I mean putting an increasing load on my cardboard (like weights or dictionaries) until it folds, but i doubt about the fact that the real strength received by cardboard identifies as the weight that it supports (With the reaction force of the support) : So how is the Strength on the ECT machine measured ?
Thank you in advance for your response :)
Special thanks sir
I'm trying to found some formulae to calculate this kind of resistence for wood boxes, do you know some?
I work with furniture and I'm trying to reduce the thickness of some boards to relieve some weight, but I'm worried about the final resistence.
great work Ben thanks alot but i have a question , what is the effect of changing paper weight i think paper GSM will have a great effect on the BCT
and still waiting your next videos
Thanks @Mazen Mahmoud, From my understanding of the box strength tests, (Mullen/Burst Test, and Edge Crush Test/ECT) the changing paper weight will have a greater effect on the Mullen or Burst Strength. This test is looking for the amount of pressure it takes to burst through the material. With a heavier paper, we may see higher pressures to bust through the material. This of course is not always the case. As for the effects on the ECT rating, the paper weight does matter, but in this test I believe the real factor when it comes to the paper is the fiber used for the different layers. A box rated for 32 ECT for example can hold the same max weight of 65 lbs as a #200 Burst tested box before failing. The burst tested box gets its strength from mass while the ECT box gets it strength from Physics and the Flutes of the Corrugated board. Hope this answers your question! Thanks for watching the video.
Good bro
Great video! It was very useful. I just got a question, does this formula applies to gaylord containers as well?