济南塑料袋：同样是液体，为什么塑料袋装水、装啤酒不会渗出来，而装油却会？

来源：http://www.scuhtg.com/ 日期：2024-08-28

方便塑料袋的发明，可以说大大方便了我们的生活。所以现在大到小到外面小摊买东西的时候，都会给我们用塑料袋装着，就是为了提的时候方便。对于平常出门不带包的人来说，真的是非常的方便，也非常的干净卫生。在有些时候，它不仅可以装一些固态的东西，还可以装液体。比如青岛啤酒。

The invention of convenient plastic bags has greatly facilitated our lives. So now, from supermarkets to small stalls outside, they always put things in plastic bags for us to carry conveniently. For people who usually go out without carrying a bag, it is really convenient and very clean and hygienic. At times, it can hold not only solid objects but also liquids. For example, Tsingtao Beer.

其到了青岛，每年的啤酒节的时候，很多人都会来青岛参观，很多的路边摊上都是大桶的啤酒，对于购买的人，只需要用袋子装下就可以，非常的方便，对于商家来说袋子的也更便宜，所以也节省了成本。可以说塑料袋无论是装水装啤酒或者是装固态的东西都是非常的，但是我们也发现塑料袋唯独不能装油，会发现渗漏的现象。所以很多人也是非常的不理解，为什么同样是液体，无论是装水或者是装啤酒都不会渗透出来，但是装油类却会发生渗出来的现象

When they arrive in Qingdao, many people come to visit during the annual Beer Festival. Many roadside stalls are filled with large barrels of beer. For buyers, they only need to pack it in bags, which is very convenient. For businesses, the price of bags is also cheaper, so it also saves costs. It can be said that plastic bags are perfect for holding water, beer, or solid objects, but we have also found that plastic bags cannot hold oil and may experience leakage. So many people also don't understand why the same liquid, whether filled with water or beer, won't seep out, but when filled with oil, it will seep out

塑料袋其实也有各种质量的，也分不同的。对于普通商家来说，当然是尽可能的便宜。而且生产塑料袋的厂家在生产过程中会加入一些填充的材料，例如石灰粉。我们知道这种材料其实是有轻微的腐蚀成分的，所以会导致塑料袋的分子之间存在一定的间隙。只是非常小，我们用肉眼是无法看到的。水和啤酒的密度，相对来说都比油大一些。

Plastic bags actually come in various qualities and prices. For ordinary merchants, of course, it is as cheap as possible. Moreover, manufacturers of plastic bags will add some filling materials, such as lime powder, during the production process. We know that this material actually has a slight corrosive component, which can cause certain gaps between the molecules of the plastic bag. It's just very small, we can't see it with the naked eye. The density of water and beer is relatively higher than that of oil.

也就是说它们的分子结构在体积上要大于油。而且水分子结构本身就大，再加上它有表面的张力，所以同样一个塑料袋装水或者啤酒的时候，都不会发生渗漏的现象，但是装油的时候就会发生。

That is to say, their molecular structure is larger in volume than oil. Moreover, the structure of water molecules themselves is large, coupled with their surface tension, so when a plastic bag is filled with water or beer, there will be no leakage, but when it is filled with oil, it will occur.

当然也不全是油的原因，还有一方面就是塑料袋，因为塑料袋主要的生产成分是聚氯乙烯，和油一样都属于有机物。我们知道在物理学上有一种相溶的原理，也就是说油可以随着时间的延长，而不断的溶解塑料袋本身。但是水和塑料袋是完全不同的成分，自然也就不会发生溶解的现象。

Of course, it's not entirely due to oil, but also plastic bags, because the main production component of plastic bags is polyvinyl chloride, which, like oil, belongs to organic matter. We know that there is a principle of compatibility in physics, which means that oil can continuously dissolve the plastic bag itself over time. But water and plastic bags are completely different components, so naturally there will be no dissolution phenomenon.

在不断的溶解过程中，塑料本身就会发生一些间隙，再就是因为油的分子结构比袋子的间隙还要小一些，所以就会发生渗透的现象。所以油类装进塑料袋的时候之所以会渗透出来，一方面是塑料袋本身的原因，另一方面就是有本身的原因。本身因为油类的结构较小就会发生渗漏，再加上溶解的过程中就会导致缝隙越来越大，渗透越来越多。

During the continuous dissolution process, there will be some gaps in the plastic itself, and because the molecular structure of the oil is smaller than the gaps in the bag, permeation will occur. So the reason why oil seeps out when packed into plastic bags is partly due to the plastic bags themselves, and partly due to their own reasons. Due to the small structure of oil itself, leakage occurs, and the dissolution process leads to larger gaps and more permeation.

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