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McKee's formula for BCT R.C. McKee and co-authors from IPC Appleton in 1963 [1] published a formula that has withstood the test of time as the simplest and most accurate predictor for box compression strength and is thus incorporated today in commercial box design software with various empirically based correction factors
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The general full form of the McKee equation is: CFL = a * ECT b * { (D MD D CD) } a-b * Z 2b-1 where: a & b = constants determined by experimentation ECT = edge crush test Z = perimeter of the box in cm CFL = Case failure load in N D = bending stiffness of the board
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The formula is the equation of a linear regression of the RCT and SCT values of samples with different basis weights. Lorentzen and Wettre provide a general equation which should be considered as a standard example and not used directly without a careful check of the parameters. RCT CD= 120 x SCT CD - 97 or approximately RCT CD= 95 x SCT CD (N)
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Box Compression Test (BCT) = k1 ∗ ECT × √h ∗ Z Reference Mckee formula (simplified version) Where: k1 = a constant value of 5.87 h = Corrugated FiberBoard (CFB) thickness (inches) Z = box perimeter (inches) = 2(L + W) NOTES English units are used because CT Values are typically in pounds per inch units.
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"The McKee formula is a formula that can estimate the compression strength of a given box." I've been looking for this very information for ages. AGES. Finally! Thank you, Richmond Corrugated Box! McKee Formula. The McKee formula estimates box compression strength or the maximum load a box can stand for a moment. If you enter ECT grade along.
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The edge crush test is a laboratory test method that is used to measure the cross-direction crushing of a sample of corrugated board. It gives information on the ability of a particular board construction to resist crushing.
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McKee's formula: BCT = a.ECTb√DMDDCD Z2b-1 2 a, b: constants determined experimentally Z: perimeter of the box D:99981231160000-0800 bending stiffness of the board McKee's Formula Kraft Unit - Factory Address: Venkraft Paper Mills Pvt Ltd., Unit - 1 10th K.M.,Kelamangalam Road, Aggondapalli Village, Hosur-635110, Tamil Nadu, India.
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Metric McKee Formula As input to the calculations, the Metric McKee formula requires the combined board Edge Crush Test (ECT) in kN/m, Caliper (CAL) in mm and Case Perimeter (PER) in cm. The Metric McKee formula is expressed as: Compression Strength = 1.82 x ECT x 1.0194 x CAL0.508 x PER0.492
(PDF) Experimental Verification of McKee Formula
Simplified McKee equation (typical) Full McKee equation (more accurate ) Simplest and quickest way to estimate BCT "Maltenfort" equal deformation model for ECT: ECT C 2 SCT liner SCT medium C 0 .7 Simplified McKee equation for box compression (easy but not accurate) : Take-up factor for the medium ~ 1.42 for C flute BCT ( lbs )
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in the cross direction (CD), which he de fined as the parameter P m and parameters describing the bending stiffness of a cardboard box in two direc-tions D CD and D MD. McKee also used the param-eter P, meaning the perimeter of the box, a and b constants defined experimentally. The ratio of height H to the circumference P must be .1:7 » 0.143.
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La formule de McKee impériale exige les informations combinées portant sur le test d'écrasement des bords (ECT), l'épaisseur (CAL) et le périmètre de caisse (PER). Résistance à la compression = 5,874 * ECT * CAL0,508 * PER 0,492 Formule de McKee métrique
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Good Morning, I'm glassing quad fins for the first time using the McKee Formula. My goal is to ride this shortboard in steep waist/head high waves, so pivot and hold are more important than drive. I followed the math and measurements and still have four days before I glass these on, so I thought it'd be wise to run this by the experts here. Also see, pic below: BOARD SPECS 6'2" x 19.8" x.
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Overall, the box compression strengths (BCT) predicted by the McKee formula were off anywhere from 50.48% overestimate for the 5"x5"x48" box size to 69.36% underestimate for the 6"x6"x12" box.
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