(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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McKee et al. started the development of the BCT prediction formula with the empirical formula for the failure load of a rectangular plate vertically loaded. The edges of the plate are unrestrained and so are said to be simply supported using engineering mechanics terms. A box is really 4 connected corners
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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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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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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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Paul Dudiak's 1969 McKee Mk12 was originally built-to-order for Tito Nappi, who owned Team Nappi Racing of Rockford, Illinois. The team's driver was Kurt Reinold, who drove it to eight SCCA Formula A National wins between 1969 and 1971. He also won numerous SCCA Divisional races and the SCCA Central Division Championship of 1970.
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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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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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The McKee formula for Compression Estimation The style common method of calculating a grade compression failure load (CFL, also sometimes noted as Box Compression Test Strength or BCT), is the McKee formula. This formula was developed in the 1960's and is named after one of it's main inventors.
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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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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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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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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
