Found inside – Page 81The McKee formula provides a compression strength estimate of a given box . By knowing the compression strength , a box designer can determine the ECT test ... Target Compression Formula. Stacking Strength The TOPS Pro software uses the McKee formula to calculate the stacking strength of a regular slotted container (RSC). The buckling load for a panel is approximated by the form: w2 C D D P MD CD cr Found inside – Page 3-17(1963) developed a design formula (3.1) for corrugated board boxes based on the Cox formula and published the classical article “Compression Strength ... Found inside – Page 1127The McKee formula relating box compression strength to board edge crush strength , board m.d. and c.m.d. bending stiffness , and box circumference is revd ... 1 . Box Compression Testing (BCT) is a common formula used in the corrugated industry to determine approximately how much weight that is before a container begins to collapse. The McKee formula estimates box compression strength or the maximum load a box can stand for a moment. under ECT. Copyright© 2005 Richmond Corrugated, Inc. Found inside – Page 151Box compression strength may be determined by either of two methods, calculated estimation, and laboratory testing. Calculation of the estimated box ... Box Compression Test (BCT) = k1 ∗ ECT × √h ∗ Z Reference Mckee formula . %PDF-1.5 Found insideCompressive strength of boxes -- Part II . Forest Products Lab . Structural Design Notes for Corrugated Containers , Note No. 12. Package Engineering 5 ( 1 ) ... Enter some brief information to see results, Box Compression Test (BCT) Strength Calculator. Remember the bottom box must support the top load over a period of . Shop now. At the USDA Forest . Found inside – Page 9In 1943 , Little ( 7 ) developed an equation for box compression strength based on the engineering column strength formula by Rankine . Website design and hosting provided by Sageisland.com Find answers to commonly asked questions. Remember the bottom box must support the top load over a period of . Where A is the area of loaded surface (i.e. The Metric McKee formula is expressed as: Compression Strength = 1.82 x ECT x 1.0194 x CAL0.508 x PER 0.492 . As per the McKee formula: Compression Strength = 5.874 * ECT * CBT0.508 * P0.492. Failure can occur when a container collapses, becomes unstable, or creeps to a critical deformation. Found inside – Page 13Compression. Strength. of. Corrugated. Boxes. Yinghong. Zhou1,a, ... To test how well our formula predicts compression strength, we compare real test ... Repeat the whole procedure (Step 9 to 13) to find the compressive strength of the cube at . While preserving the critical performance and design data of the previous edition, this second expanded edition offers new information on the technologies, tests and regulations impacting the paper and corrugated industries worldwide, with ... It is commonly used to evaluate shipping containers made of corrugated fiberboard as well as wooden boxes and crates.Industrial and consumer packages other than boxes can also be subjected to compression testing: drum . If the compression strength and distribution environment is known, the effective stacking strength of any given RSC can be reasonably estimated. We do not share your information. compression strength of a box BCT was taken as the compression strength of 4 panels P p sufficiently high so that they will buckle when vertically loaded, and a square footprint box is assumed. %���� It is important to carefully consider all the factors that weaken the stacking strength of a box before products are packed and put into the distribution cycle. Find Westpak's locations, phone numbers & business hours. You can A target compression value can be determined by answering the questions on this worksheet. Compression Strength = 5.874 * ECT * CAL 0.508 * PER 0.492 (For more information on the McKee formula, please refer to the August 1963 issue of Paperboard Packaging, Compression Strength Formula for Corrugated Boxes by R. C. McKee, J. W. Gander, and J. R. Wachuta published by The Institute of Paper Chemistry, Appleton, Wisconsin, USA. 2. and testing of every box. <> Box Compression Test (BCT) = k1 ∗ ECT × √h ∗ Z Reference Mckee formula . • from medium and linerboard compression strengths (SCT or RCT), we can calculate the expected edge compression strength (ECT) of corrugated board • From corrugated ECT, bending stiffness, caliper, box perimeter, the BCT can be calculated using: a) Simplified McKee equation (typical) b) Full McKee equation (more accurate ) 2 It usually provides a plot of deformation vs compressive force.. Box Compression Test (BCT) Strength. English units are used because CT Values are typically in pounds per inch units. <>/XObject<>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/Annots[ 17 0 R] /MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> It usually provides a plot of deformation vs compressive force.. Found inside – Page 262Recent work has been centered on a tentative formula which was developed for predicting the compressive strength of tubes from basic data obtained from ... Found inside – Page A-221formula ' " , between the BCT box compression strength and the raw material , the liner and the medium is very well known . The ECT compression strength of ... This is not as accurate as performing the compression test in a lab. 2 0 obj ), \begin{array}{l}{\text {Box Compression Test }(\mathrm{BCT})=\mathrm{k}_{1} * \mathrm{ECT} \times \sqrt{\mathrm{h} * Z}} \\\\ {\text {Reference Mckee formula (simplified version) }} \\ { { Where: }} \\ { \mathrm{k} 1=\mathrm{a} \text { constant value of } 5.87} \\ {\mathrm{h}=\text { Corrugated FiberBoard (CFB) thickness (inches) }} \\ {\mathrm{Z}=\text { box perimeter (inches) = } 2(\mathrm{L}+\mathrm{W})}\end{array}. If this data is not provided by your supplier, Westpak can provide testing to determine or verify this value. Shown below is the shortend form of the formula, which is normally used in . L×B). 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. moment. compression strength or the maximum load a box can stand for a Found insideThe most widely known formula which links the box compression strength with the mechanical properties of its components is the one devised by McKee (McKee ... It is commonly used to evaluate shipping containers made of corrugated fiberboard as well as wooden boxes and crates.Industrial and consumer packages other than boxes can also be subjected to compression testing: drum . Found inside – Page 25Compressive strength of boxes -- Part II . Forest Products Lab . Structural Design Notes for Corrugated Containers , Note No. 12. Package Engineering 5 ( 1 ) ... Found inside – Page 7577.3 Puncture Resistance — This attribute relates to the ability of the fiberboard ... box compression strength through the well - known simplified formula ... x��[Yo��~��0/����2\F�$iԍէ��0�F�dȡ�����HY#�E��23g��|�pruӘ|�2#>~��1Fe�߯�U������Wj����Uy}-n��������Ͼ�=w�����;_x��I �Q,�����������޿�sŧ�w��B��2�ڞ"=�B��XD��D�㏨L�J���C�e(���LF|�����ݗ{��\]����u���O���C��yn�Ak�^(�wa�ֽ���J�}%� 7��W��������{��0ǰ���jvS���9ߝ�ꗸ����S7�m����J��x^�݋x��U�F�p�7�!����&C?r�)ŏ^������$�� �)�g� �� Yϓ����_��:���w�3������$�k�0����e ��;��D��������q�I�aI�D��6��=�ΒR�`7�]�W��鋾��^ �$u���%�#>6,��"ߪ�*�Cuq)�:/>�{��ZLt�>5YG��,�)�3��bsl���px�? This article was All rights reserved. Bulletproof Original Ground Coffee. 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. Found inside – Page 478In laying out copy to be printed on the box , the alphanumeric and ... for a rough - and - ready calculation of compression strength is to also take into ... 3 0 obj Even though the McKee formula is a generally accepted design formula, it is still up to the packaging engineer to evaluate the degree to which this formula might apply and perform the physical tests to assure The effect of box height (which is not included in McKee formula) on its compression strength was also investigated using three box sizes, 5"x5"x5", 5"x5"x12", and 5"x5"x48". A T-beam (or tee beam), used in construction, is a load-bearing structure of reinforced concrete, wood or metal, with a T-shaped cross section.The top of the T-shaped cross section serves as a flange or compression member in resisting compressive stresses.The web (vertical section) of the beam below the compression flange serves to resist shear stress and to provide greater separation for the . Found inside – Page 530To test how well our formula predicts compression strength, we compare real ... Keywords: Corrugated Boxes; Compression Strength; Cardboard Parameter Tests; ... Paperboard Packaging, Compression Strength Formula for Corrugated Boxes. It is important to carefully consider all the factors that weaken the stacking strength of a box before products are packed and put into the distribution cycle. The compressive strength of a corrugated box can also be calculated using the McKee formula where the Edge Crush Test (ECT), Caliper or corrugated board thickness (CBT) and box perimeter (P) values are taken into account. The Forest Products Laboratory is maintained in coop-Products Laboratory, Madison, Wisconsin, ini­ eration with the University of Wisconsin. Lately, the more common term around the industry is now the BCT value or Box Compression Test. Westpak offers white papers as a useful time-saving reference. TESTS FOR DETERMINATION OF COMPRESSIVE . If you enter ECT grade along with the caliper of the combined board and the length, width and depth of the box, the McKee formula calculates a theoretical compression value for your box. (3,990) Shop now. the compression strength of the corrugated shipping container. Sitemap (907) Estimates the BCT of a regular slotted container (RSC) for a moment with flutes positioned vertically. This book reflects decades of the author's experience as a research scientist and lab manager providing industry clients, manufacturers, product developers, marketing and distribution organisations with data to answer queries regarding ... Found inside – Page 94Statistical Formulas The simplest reported box compression models have been statistical relationships between box compression strength P and box length L ... and testing of every box. We will send you newsletters that you can opt-out for at anytime. Reduction in box compression strength was the highest for stack offset along both the adjacent panels followed by length and width panel. A simplified McKee formula is as follows: BCT = Box compression test in Pounds If you enter ECT grade along with the caliper of the combined board and the length, width and depth of the box, the McKee formula calculates a theoretical compression value for your box. Presenting recent principles of thin plate and shell theories, this book emphasizes novel analytical and numerical methods for solving linear and nonlinear plate and shell dilemmas, new theories for the design and analysis of thin plate ... The buckling load for a panel is approximated by the form: w2 C D D P MD CD cr The container compression test measures the compressive strength of packages such as boxes, drums, and cans. If you enter ECT grade along with the caliper of the combined Found inside – Page 1McKee developed a formula for predicting the top - tobottom compressive strength of corrugated fiberboard boxes . It is based on ( 1 ) board thickness ... Found inside – Page 135An empirical formula is given for calculating the compression strength of boxes as a function of the resistance to buckling of the board and the perimeter ... <>>> But the need for analytical solutions in addition to numerical methods is what drove the creation of Exact Solutions for Buckling of Structural Members. It allows readers to assess the reliability and accuracy of solutions obtained by nume Check in on recent changes to some of Westpak's most commonly referenced protocols. endobj Reduction in box compression strength was the highest for stack offset along both the adjacent panels followed by length and width panel. 4 0 obj For more information on the McKee formula, please refer to the August 1963 issue of . � ��Cx����V9B9>B�G1���I6��my$o~L�I���7��4��m{�n2�q����a6� |wg[`T���V���Z���M��P0��ةUMᣡ��YTh��t�V���4AG���@ {,�d����9�R//�����142Mw��5�0. Complete the form below, then click $14.99 Regular price $10.49. Box Compression Test (BCT) The BCT is the measurement of the force the box can withstand before crushing. The simplified McKee formula above provides a quick estimate that should not be used to rate the strength of an actual box. Found inside – Page 54At present, the compressive strength design of corrugated box adopts mainly the K.Q.Kellicutt formula (1). Px, axz, Z and J in this formula are respectively ... (Note that BCT is not stacking strength, which is the maximum load a box can handle throughout the distribution cycle.) The present author measured the mechanical properties of a large number of fibreboard boxes, and has derived a statistical formula useful for estimating the compression strength of a box based on its specifications — grade of corrugated fibreboard, size of box, type of box, printed area and moisture content. ?�� ���k%���eg���v��.sp�o��n�j�"ۈ�,ץ�[cY*�gnO������lz�����q��76:H�p����E�TH�Y�J�idz���R�&7�ѢZ � A simplified McKee formula is as follows: BCT = Box compression test in Pounds Found inside – Page 362One objection to the Mullen burst test is that it has no relationship to a box's compression strength , while a number of formulas have been devised that ... bottom box compression strength is an important would reliably estimate box compression strength without requiring the actual production . It is possible to estimate the compressive strength of a cardboard carton using the McKee Formula. Found inside – Page 9Packaging professionals agree that stacking or compression strength is a ... the ECT value and compression strength as presented in McKee's formula [ 8 ] ... This allowed a simple relationship between the BCT and the box perimeter Z. Found inside – Page 44Further information on the Glas- use the formula for design purpose Weld ... of compressive strength g.p.m. fog blanket with a large diame- boxes to ... Found inside – Page 1McKee developed a formula for predicting the top - tobottom compressive strength of corrugated fiberboard boxes . It is based on ( 1 ) board thickness ... Target Compression Formula. Sale. Even though the McKee formula is a generally accepted design formula, it is still up to the packaging engineer to evaluate the degree to which this formula might apply and perform the physical tests to assure stream The peak force compression strength of the corrugated shipping container without hand holes was 822.4 lbs (Figure 1) and the peak force of compression strength of the corrugated box with hand holes sized 1"x4" was 511.9 lbs (Figure 2) - Box Compression Test (BCT) The BCT is the measurement of the force the box can withstand before crushing. The formula for calculating the comprehensive ring crush strength of five layer corrugated board base paper is as follows: Px= (R1+R2+R3+Rm1C1+Rm2C2)／15.2. Found inside – Page 20where : P = Box compression strength ( lbs ) Pm = Edge crush test value ( ECT ... published the formula to predict compression strength of corrugated boxes ... Compression Strength Compression strength is the optimum top load that a given container can endure for an instant before it breaks down. Stacking Strength The TOPS Pro software uses the McKee formula to calculate the stacking strength of a regular slotted container (RSC). It's important to figure out this information to make sure your boxes can withstand certain pressures during shipping and receiving. (Note that BCT is not stacking strength, which is the maximum load a box can handle throughout the distribution cycle.) The problem is how to choose from alternative box . Check in on the Westpak Leadership team and see what we're up to. k 1 = a constant 5.874. Found inside – Page 399BOX COMPRESSION ANALYSIS OF WORLD - WIDE DATA SPANNING 46 YEARS Thomas J. ... to generate predictive equations that bottom box compression strength is an ... board and the length, width and depth of the box, the McKee formula This formula was developed in the 1960's and is named after one of it's main inventors. get ECT grades and calipers off the table in Box Performance The compressive strength of a corrugated box can also be calculated using the McKee formula where the Edge Crush Test (ECT), Caliper or corrugated board thickness (CBT) and box perimeter (P) values are taken into account. 3. The method of calculating a grade compression failure load (CFL, also sometimes noted as Box Compression Test Strength or BCT), used by this version of Boxcomp is the McKee formula. Found inside – Page 2957.3.1 Ultimate Strength under Axial Compression The ultimate strength of a box ... of the box column may be estimated from the Johnson - Ostenfeld formula ... Such an estimate shall not to be used in place of testing conditioned test samples in a controlled, repeatable test environment, with calibrated instrumentation, validated machines, and trained test operators. Westpak newsletters delivery industry news and Westpak updates. Found inside – Page 423.4.2 Models for static box strength Models of box strength provide ... on the Cox formula and published the classical article “Compression Strength Formula ... This is not as accurate as performing the compression test in a lab. c��. by R. C. McKee, J. W. Gander, and J. R. Wachuta published by The Institute of The compression test is essential for the customer as it measures the compressive resistance, deformation, and stacking capability of the carton box. Found inside – Page 11McKee , et al ( 1963 ) developed an equation which is known as the McKee formula and is used to predict box compression strength . The formula is as follows ... Box Compression Testing (BCT) is a common formula used in the corrugated industry to determine approximately how much weight that is before a container begins to collapse. 1 0 obj It helps in determining the stacking strength of the corrugated box. bottom box compression strength is an important would reliably estimate box compression strength without requiring the actual production . It provides some relationship with the peak top-to-bottom compression strength of empty singlewall regular slotted containers in laboratory conditions. Shown below is the shortend form of the formula, which is normally used in . Found inside – Page 1McKee developed a formula for predicting the top - tobottom compressive strength of corrugated fiberboard boxes . It is based on ( 1 ) board thickness ... compression strength when compared to the individual compression strength of a box. For more information on the McKee formula, please refer to the August 1963 issue of . This allowed a simple relationship between the BCT and the box perimeter Z. The McKee formula requires ECT as an input (lbs./inch) to calculate the theoretical compression value for a box, but it can also help in "reverse engineering" a box—if you know the dimensions and have a target stacking strength, the McKee formula can tell you what ECT you need to manufacture your board to. Estimates the BCT of a regular slotted container (RSC) for a moment with flutes positioned vertically. More It's important to figure out this information to make sure your boxes can withstand certain pressures during shipping and receiving. The method of calculating a grade compression failure load (CFL, also sometimes noted as Box Compression Test Strength or BCT), used by this version of Boxcomp is the McKee formula. Lately, the more common term around the industry is now the BCT value or Box Compression Test. Found inside – Page 601... of the McKee equation for box compression strength : P = P ( VD , D ) -6Z25-1 ( 11 ) where P is the box compression strength and a , b are constants .

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