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液料点胶之使用注意

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  首先点胶量的大小通常认为胶点直径的大小应为产品间距的一半,这样就可以保证有充足的胶水来粘结组件又避免胶水过多。点胶量多少由时间长短来决定,实际中应根据温度和胶水的特性选择点胶时间。其次点胶压力方面,通常压力太大易造成胶水溢出、胶量过多;压力太小则会出现点胶断续现象和漏点,从而导致产品缺陷,所以需要根据环境温度和胶水粘度等因素进行调节。再者,点胶机针头通常要选取针头内径大小为点胶胶点直径的1/2左右的针头,点胶过程中,应根据产品大小来选取点胶针头。还有针头与工作面之间的距离,不同的点胶机采用不同的针头,有些针头有一定的止动度,因此需要把握好点胶距离,甚至每次工作开始之前应做针头与工作面距离的校准,即Z轴高度校准。


液料点胶之使用注意


  除却点胶机本身的因素,胶水的粘度直接影响点胶的质量,粘度大,则胶点会变小,甚至拉丝;粘度小,胶点会变大,进而可能渗染产品,而胶水温度应为23℃~25℃;环境温度对胶水的粘度影响,温度降低粘度增大,出胶流量相应变小,更容易出现拉丝现象。胶水固化温度曲线生产厂家已给出,在实际应尽可能采用较高温度来固化,使胶水固化后有足够强度。


  另外胶水一定不能有气泡。一个小小气泡就会造成许多产品没有胶水;每次中途更换胶管时应排空连接处的空气,防止出现空打现象。



安达自动化旗下的iJet-7系列点胶机,适用于多规格的电路板、基材,为芯片封装、电路板组装、SMT点红胶、医疗用品等产品的点胶应用而设计。欢迎各大商客来电咨询,热线电话:400-660-7690转1。


(内容来源于网络,小编整理报道。)


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