WHITE PAPER equivalent detection to that of a 1.8 mm ferrous ball, a metal detectable bristle with a cross-sectional diameter of 0.50 mm and a length of 50 mm would be required. Method - Durability The durability (with regard to break strength and elasticity) of metal detectable plastic (polyester + metal detectable component) bristles was assessed Table 3: Test data from 0.35 mm standard plastic (polyester) bristles Plastic n = 10 F max [N] dL at F max [mm] x ̄ 27.0 104.9 s 1.69 11.7 v } [%] 6.26 11.11 F max: Bristle Break Strength dL at Fmax: Bristle Elongation (elasticity) Graph 1 – Break strength (force) and elasticity of 0.35 mm standard plastic (polyester) bristles Load Cell: 200N HP Extensometer: Crosshead Grips: Pneumatic Grips - 8190 Newtons Jaws Insert: Oxidceramics Clamping Pressure: 4 bar Pre-Load: 1 Newtons Speed, Pre-load: 10 mm/min Test Speed: 20 mm/min Grip to Grip distance at start: 100 mm Figure 6. Zwicki 5kN bristle break strength and elasticity assessment equipment (Zwick Roell, Germany) and compared with that of standard plastic (polyester) bristles. Tests were performed by Zwick Roell, Germany, using a Zwicki 5kN bristle pull test apparatus, as shown in Figure 6. Results - Durability Test data is presented in the following tables and graphs. Table 3 and Graph 1 show results for 0.35 mm standard plastic (polyester) bristles. Table 4 and Table 4: Test data 0.35 mm metal detectable plastic (polyester + metal detectable component) bristles Metal detectable n = 10 F max [N] dL at F max [mm] x ̄ 16.0 48.3 s 0.826 1.3 v } [%] 5.16 2.74 F max: Bristle Break Strength dL at Fmax: Bristle Elongation (elasticity) Graph 2 – Break strength (force) and elasticity of 0.35 mm metal detectable plastic (polyester + metal detectable component) bristles Vikan A/S - Department of Research & Development 5 Copyright © 2021 Vikan A/S · All Rights Reserved
Download PDF file