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食品塑料包装袋为什么会出现异味又该如何处理

来源: 时间:2020-04-23 10:22:40 浏览次数:

  食品塑料软包装有时因为有异味而被用户拒收,还有内装食品被污染上不良气味则遭遇赔偿的事件。食品包装袋的异味,主要来自印刷油墨和油墨溶剂或复合胶黏剂和复合胶溶剂,有部分却来自复合包装的内膜。
因而在制作复合包装时应该注意以下几点:
(1)印刷图案的设计要选少色和单色元化,尽量避免实底满版的印刷图案。
(2)选用印刷油墨时,不要使用气味较大的表印油墨。不要使用含杂质的高沸点溶剂,如焦油苯、混合苯、回收的溶剂。
(3)复合不要使用气味高的单组分PS复合胶黏剂。
(4)复合时选用的内层薄膜材料,要检查它是否有气味,不要使用加有填充料的PE薄膜做复合的内层基材。
(5)尽力提高印刷速度,尽量降低印刷油墨的黏度,减少上墨量,保持烘干箱和厂房通风的畅通,将油墨和油墨溶剂残留降最低。
(6)要保持复合机烘道排风的流畅,上胶要适量,不要使用含杂质和水分多的酯类溶剂(倒出的溶剂和配好的胶水要盖好,防止吸入空气中的水分),复合机热鼓温度要在70℃左右。
最关键的是要尽量选用阻隔性能好的薄膜,做复合包装的内层材料。这样即便有溶剂残留和气味也不会接触食品使食品染上不良气味。比如使用阻隔性较差的PE薄膜做复合包装的内层材料,那么胶黏剂的残留气味,就容易渗透而污染内装的食品
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