Issue link: https://cp.revolio.com/i/989729
18 ista views • May 2018 • www.ista.org Evaluation of Stability of Unit Loads for Tilt and Shock Events During Distribution > CONTINUED FROM PAGE 17 Test Methodology Prior to beginning any testing, the faces for the unit load were identified as shown in Figure 8 below [21]. For the six-tier unit load, "layers" were designated as follows: 1.Top layer: top two tiers of packaged-product 2.Middle layer: middle two tiers of packaged-product 3.Bottom layer: bottom two tiers of packaged-product The testing procedure for the tilt test is detailed in Table 1. Due to the potential limitations and safety issues related to the mid-test measurement setup, it may not be possible to measure the offsets for each layer and for each Face. In this situation, it is recommended that only one offset value be measured for each tilt angle. A single marked case with the highest measured pre-test offset value regardless of the Layer and Face is to be used for the mid-test offset value measurement. Figure 8: Identification of Faces of Unit Load Step Action 1 Prepare three unit loads each replicate test of packaged product for each stack-pattern (Section 2.1) and tilt-angle (Section 2.2). Identify the Faces and Layers of the unit load as shown in Figure 8 2 Apply the stretch wrap per specifications provided in Section 2.1. Allow 1 hour of relaxation time for all stretch wrapped unit loads prior to testing Pre-test offset measurement (Figure 9) 3 Measure the pre-test offset for each layer of Face 2 and Face 4 of the unit load as stated in Section 2.2.1 and record in the values in Table 1. Mid-test offset measurement (Figure 9) 4 For each layer and tilt angle of the two stack-patterns, identify the Face with the largest individual offset (Table 1) and tilt the packaged-product along the selected Face. If the offset is the same for both faces, select either Face 2 or Face 4. 5 Using tilt test apparatus, slowly tilt each unit load along the pallet Face identified in Step 4 from its horizontal position to the first tilt level angle of 5ͼ. Measure the mid-test offset for each location identified in Step 4 while the tilt angle is maintained after 1 and 10 minutes (Table 2). Note IfÖ ThenÖ At any point testing becomes unsafe and/or Slowly return the unit load to the horizontal positon The unit load is no longer contained and/or Load shift exceeds 25ͼ and/or Post-test offset measurement (Figure 9) 6 Slowly return the unit load to the horizontal position and record the post-test offset measurements for each location identified in Step 4 in Table 3. 7 Repeat steps 3-6 for the next tilt angles of 10ͼ, 15ͼ, 20ͼ, 22.5ͼ and 25ͼ Table1: Tilt Test Procedure