Box Plant Basics - Board Tests

SKU: C-469Duration: 34 Minutes Certificate Included

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Course Details

Specs

Training Time: 34 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Corrugated boxes tend to fail in two primary ways: either by collapse under a compressive top-load created by stacking, or by rupture due to rough handling or heavy or awkward loading. Different tests can be used to predict the performance of corrugated board and corrugated boxes under these two conditions. Several other tests can be used to monitor corrugating and converting operations in box plants. This course describes several tests that can be used at box plants to predict product performance or to monitor operations. These include the box compression test (BCT), edge compression test (ECT), short-span compression test (SCT), bending stiffness, tensile stiffness, box drop test, burst strength test, puncture test, flat crush test (FCT), warp test, and pin adhesion test. It also lists the organizations which have developed standardized test methods for corrugated board and explains the importance of sample conditioning.

At the end of this module, you will be able to:

  • Identify the organizations which have developed standardized test methods for corrugated board
  • Explain the importance of sample conditioning
  • Describe the tests used to predict the stacking performance of corrugated board boxes, including the box compression test (BCT), edge compression test (ECT), short-span compression test (SCT), bending stiffness, and tensile stiffness
  • Describe the tests used to predict the performance of corrugated boxes during rough handling or with heavy or awkward loads, including the box drop test, burst strength test, and puncture test
  • Describe tests used to monitor corrugating and converting operations at box plants, including the flat crush test (FCT), warp test, and pin adhesion test

The following key questions are answered in this module:

What does "sample conditioning" mean?
"Sample conditioning" means that the samples are exposed to a certain temperature and humidity range for a specified amount of time before testing

What advantages does the short-span compression test (SCT) have over other compression tests?
The short-span compression test is faster and more accurate than many other compression tests

What is the flat crush test (FCT) used to predict?
The flat crush test can be used to predict the ability of corrugated board to withstand converting operations which subject the board to compressive forces, like die cutting and printing

Why is it important to minimize warp in corrugated board?
Warp is important because excessive warp can cause feed and runnability problems on box plant converting equipment

Besides box perimeter, what values must be known to use the McKee equatios to estimate the box compression test (BCT) value for a corrugated box?
The shorter McKee equation needs the board thickness and edge compression test (ECT) value for the corrugated board, while the longer (and more accurate) equation needs the edge compression test value, plus the MD and CD bending stiffnesses of the board.

Below is a transcript of the video sample provided for this module:

Up until now, we have discussed tests that can be used to predict the resistance of corrugated boxes to failure due to stacking. The other main way that corrugated boxes fail is by rupture due to rough handling and/or heavy or awkward loads. The box drop test was developed to predict the performance of boxes under these unfavorable conditions. During a box drop test, a box is filled with a standard load and sealed and then dropped onto its corners, edges, and/or flat surfaces from a standard height.

Use the additional resources and links below to learn more about this topic:

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