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All corrugated not created equal
Two boxes each indicate a gross weight of 65 pounds in the box makers' certificates. Do these corrugated boxes offer the same strength? Unfortunately, they may not.
The reason is paperweight. Take a look at the example pictured below. Box certificate number 1 says "200-burst strength" and box certificate number 2 says "32-edge crush test." Note that the burst strength certificate also specifies a "minimum combined weight of facings," but the edge crush test does not. The minimum combined weight of facings tells the amount - or weight - of paper used to manufacture the corrugated material.
Paperweight controls the grade of the corrugated. The greater the paperweight, the greater the bursting strength. Edge crush test corrugated does not adhere to any paperweight specifications. So, while box number 1 shown here has a burst strength of 200 pounds per square inch, bursting strenghts for a 32-edge crush corrugated (like box number 2) frequently range from 130 to 190 pounds per square inch. Therefore, even though both specify the same 65-pound weight limit, they do not offer the same strength properties.
If you have concerns about the performance of your edge crush test corrugated containers, you should look at comparably rated burst test containers.
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Mullen Tester - Whether you are using a fully automatic or hand-operated tester, the testing principle remains the same:
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A sample of the test material is clamped between two horizontal, flat circular
plates located on the apparatus.
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Fluid is displaced from the chamber by a piston moving at a constant rate of force, inflating a heavy rubber diaphragm to expand through the lower plate opening and against the unsupported area of the sample.
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At the same time, the gauge connected to the cylinder indicates the pressure rise in the cylinder.
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The instant the sample bursts, the pressure drops, leaving the gauge pointer stationary and indicating the force that was required to burst the sample.
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Mullen Digiburst - If digital capabilities are desired, the Mullen Digiburst is a fully functional peak pressure measurement display and recording device that was designed exclusively for use with the Mullen Burst and Hydrostatic Testers. The Digiburst consists of a digital display, transducer and printer (software also available for computer interface). The transducer is mounted on the tester either to the gauge body or manifold. Once connected, the transducer will capture the tester's readings under the above operating conditions and digitally transmit them to a printer or personal computer. The Digiburst advantage is the efficient and accurate recording of test results, an improved source of documentation, and with the software option - the ability to transmit test results to either a personal or networked computer in ³real-time² for compilation, evaluation and additional analysis. Readings include minimum, maximum, average, number of tests and a tare value for textiles - the user can select readings to be recorded in either PSI or KPA units.
System requirements for the software installation are:
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Windows 95/98/2000 or NT 4.0
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Pentium Processor 233 MHz
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32 Megabytes RAM
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10 MB Free Hard Drive Space
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COM Port (COM1 Preferable)
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PS/2 Mouse
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Microsoft Excel 97 or higher
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