打膠機使用的熱熔膠粘劑是一種靠界面作用(化學力、物理力)把各種材料牢固地粘合在一起的物質，簡稱為膠。人類使用膠粘劑的歷史十分悠久，早期人類受天然界粘接現象的啟發，開始利用自然的膠粘劑，如血膠、骨膠、松脂、自然瀝青、淀粉、石灰等。

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