分配器分配系統必須根據精確的形狀和高度以點擊方式將粘合劑以不同的容器施加到PCB焊接掩模的表面。粘合劑必須具有非常強的吸附力(有時稱為“濕強度”)以固定組分直至其固化。固化的粘合劑必須確保SMD元件處于正確的取向,直到峰完成或回流焊接(二次雙面回流工藝)。粘合劑沉積物和形狀由不同因素決定,灌膠機,例如粘合劑粘度,粘合劑供應壓力。分配時間(時間/壓力系統),螺旋旋轉(螺旋旋轉系統),雙液灌膠機廠家,活塞沖程數(活塞系統),分配速度和噴嘴投影間隔。 SMT粘性分配過程有一些限制。小于0603(1608)的貼片組件不能放在SMT粘合劑上,否則由于運行材料而導致失效的風險相當高。另一個限制是膠粘點需要滿足高強度粘附組分,因此需要滿足更高的體投影。當然,這取決于噴嘴直徑和噴嘴凸起腳的高度。為了達到滿意度,需要考慮幾個重要參數。
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