BS EN ISO 8611-1:2022 pdf free download – Pallets for materials handling一Flat pallets Part 1: Test methods.
8.5.3.2 Test 5b — Determination of bending stiffness
Apply a datum load of (1,5 ± 0,5) % of the ultimate load determined in test 5a. Depending on the orientation of the load applicators, the deflection,y, shall be measured at points A (maximum ofy at A1, A2, A3, A4) or B (maximum ofy at B1, B2, B3, B4):
a) after positioning of datum load;
b) immediately after full test load is applied;
c) at end of the full load period;
d) after the relaxation period.
8.6 Test 6 — Wing pallet bending tests
8.6.1 Purpose
The purpose of these tests is to determine the bending strength (test 6a) and the bending stiffness (test 6b) of winged pallet during lifting with slings.
8.6.2 Procedure
Place the wing pallet, top deck uppermost, on four posts 50 mm x 50 mm positioned beneath the wings of the top deck flush with the ends of the pallet. The supports shall be fixed at such a height that a space of at least 50 mm is between the underside of the bottom deck and the ground or test frame. Each load applicator shall be positioned such that the dimension from the inside edge of the support to the centre line of the load applicators shall be 0,18 L i as shown in Figure 6. Place the load board on the load applicators and then apply the rest of the test load.
8.7.2.3 The size of a bag shall be such that, when inflated, the bag is in contact with the entire deck of the pallet. This is often possible with bags approximately 150 mm longer and wider than the top deck of the pallet to be tested.
8.7.2.4 Where bag sides overhang the pallet by more than 75 mm on either edge or end, an airbag support beam is necessary to maintain the bag overhang at the same level as the upper pallet deck during testing.
Where the load applied to the pallet is measured above the pallet during the test, the supports shown in Figure 8 shall not be used and the bag should fit the pallet as described in 8.7.2.3.
8.7.2.5 The containment or working pressure in the bag shall be adequate to structurally fail all pallets to be tested. Experience indicates that the working pressure shall be at least 0,07 MPa to 0,08 MPa.
8.7.2.6 The stroke or level of expansion in bag height depends on the design of the testing apparatus. Where expansion varies along the centre or edges of the bag, the region of least expansion shall govern bag selection. In order to avoid the influence of bag stiffness on the test data, the bag expansion shall be at least twice that necessary to cause pallet failure. The pallet supports shall be positioned as described in Figure 1 and shall be positioned with their centre lines 75 mm from the outer edges of the pallet.
8.7.2.7 Loading or testing rates shall be controlled by appropriately inflating the restrained airbag or by pressing the inflated airbag on to the upper pallet deck.