Issue link: https://iconnect007.uberflip.com/i/1513827
48 SMT007 MAGAZINE I JANUARY 2024 designed. Zones B and C can be jetted with conventional jetting nozzles because there are no components close to these regions. Conven- tional jetting nozzles do not have long channels as the needles do, for this reason, the resistance to flow is much smaller. Figure 3 and Figure 4 show the process capa- bility report for X and Y positioning. e posi- tioning in the X axis gives a process capability of ± 20.4 μm at 3-sigma and in the Y axis of ± 24 μm at 3-sigma. e process capability report for the dot diameter is shown in Figure 5. e depth. As can be observed the component is surrounded by packages with different dimen- sions and heights. is component required a solder paste type 6 with a Sn63Pb37 alloy. As a first step, a dedicated needle was designed. Figure 2 illustrates the needle, nee- dle holder, and bayonet. As can be observed in Zone A, a collision between one of the parts and the placed components can occur. To avoid this collision a needle with enough length must be used. e length of the needle shall be long enough to avoid collisions but as short as pos- sible to reduce the resistance to flow. Based on internal experience at Essemtec, high resis- tance to flow impedes jetability and tends to block the nozzle. For this case, a needle length of 6.5 mm with an opening of 0.15 mm was Figure 1: Component to be repaired, TQFP (thin quad flat package). Figure 2: Needle, needle holder, and bayonet. Figure 3: Distribution of the X positioning in Zone A. Figure 4: Distribution of the Y positioning in Zone A. Figure 5: Dot diameter distribution in Zone A.