论文部分内容阅读
如今,一次性纸杯几乎成了单位和居家必备之品,客人来了,用纸杯给客人倒杯水,显得清洁干净,又很方便。然而,近期网上盛传“一次性纸杯的第一杯水”不能喝,原因是一次性纸杯内壁上通常涂了一层薄薄的蜡,是为了防止水渗透。蜡见热是会溶化的,一般情况下,如果水的温度超过了40℃,这层蜡就会溶化掉。所以,网上说一次性纸杯不要装40℃以上的热水,最好用来装冷饮。也就是说,使用一次性纸杯装热水时,第一杯水最好不要喝,最好等四五分钟,让纸杯中有害物质充分挥发后,倒掉;从第二杯开始饮用。值得注意的是,有的生产厂家就这样介绍的。据了解,正规生产厂家会使用食品级的蜡来做纸杯的内壁涂膜,因此即便是水温高溶解了纸杯上的蜡,安全问题也不大。不过,现在有的不法工厂为了减低成本,采用成本较低的工业石蜡来做纸杯内壁的涂膜,工业石蜡中含有对人体有害的苯和多环芳烃
Nowadays, disposable paper cups almost become the essential unit and home necessities, guests came, cupped cups of water to the guests, it seems clean and very convenient. However, recent internet rumors that “the first cup of water in a disposable paper cup” can not be drunk because the inner wall of the disposable cup is usually coated with a thin layer of wax to prevent water from penetrating. Waxing heat will melt, under normal circumstances, if the water temperature exceeds 40 ℃, this layer of wax will dissolve. Therefore, the online disposable cups do not install more than 40 ℃ hot water, preferably used to hold cold drinks. In other words, the use of disposable paper cups filled with hot water, the first cup of water is best not to drink, preferably four or five minutes, so that harmful substances in the paper cup after the full volatilization, drained; from the second cup began to drink. It is noteworthy that some manufacturers introduced this way. It is understood that regular manufacturers will use food-grade wax to do the inner wall of the paper cup coating, so even if the water temperature dissolves the wax on the paper cup, the safety issue is not large. However, some unscrupulous factories in order to reduce costs now, the use of low-cost industrial paraffin to make the inner wall of the cup coating, industrial paraffin contains harmful benzene and polycyclic aromatic hydrocarbons