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塑料焊接原理

影響超聲波焊接成功的5個重要因素之塑料材料

上一篇文章中，靈科超聲波分享了影響超聲波焊接成功的5個重要因素之焊接系統頻率這個點，其實在應用超聲波焊接時，塑料材料也會影響焊接效果。

對于塑料的超聲波焊接，只適合對熱塑性塑料進行焊接。因爲它們可以在特定的溫度範圍內熔化。而熱固性塑料加熱時降解，無法利用超聲波進行焊接。熱塑性塑料的可焊接性，取決于材料剛度或彈性模量，密度、摩擦系數、導熱系數、比熱容、玻璃化轉變溫度Tg或熔化溫度Tm。

一般來說，剛性好的塑料表現出優異的遠場焊接性能，因爲它們更容易傳遞振動能量。而彈性模量低的軟性塑料，因其會衰減超聲波振動，所以較難焊接。而對于超聲波鉚接或點焊則相反，塑料越軟，就越容易鉚接或點焊。

通常，塑料可分爲非結晶（無定形）和結晶兩種。超聲波能量很容易在非結晶材料中傳遞，因此非結晶塑料容易進行超聲波焊接。而超聲波能量不容易在結晶材料中傳遞，因此焊接結晶塑料時需要更大的振幅和能量，同時也要小心設計焊縫。

可進一步影響可焊性的因素有含水率，脫模劑，潤滑劑，增塑劑，填料增強劑，顔料，阻燃劑和其它添加劑，以及實際樹脂等級。另外，還應注意不同材料之間相容性程度不同。某些材料的特定等級之間才有一定程度的相容性，其余則不相容。

最後，還要考慮焊接是近場焊接還是遠場焊接。焊頭接觸零件的位置到焊接筋的距離小于6mm的情況，叫做近場焊接。大于6mm，叫做遠場焊接。距離越大，振動衰減越大，焊接就越困難。

靈科超聲波致力于高性能的超声波塑焊设备研发、制造，为客户供应珠海超声波、中山超声波焊接机、江门超声波塑焊机、阳江超音波设备清洗机等、根据厂家需求定制非标设备。靈科超聲波産品广泛用于各个领域：汽车塑料零件的超声波焊接，打印耗材塑料焊接，电子电讯超声波焊接，无纺布超声波焊接等。

靈科超聲波浅析塑料的焊接方式（一）

汽車焊接更精良，東莞超聲波塑料焊接助力不可或缺（二）

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