防油纸袋之所以能够取代塑料制品，成为油炸、高热食品行业的选包装除了防油、环保以外当然也和防水不无关系。防油纸袋的原材料是淋膜防油纸，我们都知道一般的纸袋包装很容易湿透，不像塑料袋，外面湿了，里面的东西没事，而纸袋在防湿方面就差的很多。防油纸袋的出现彻底改变了纸袋的这一缺陷，防油淋膜纸袋既然能够快速地代替塑料袋，其不只是因为能够防油的性能，而且防油纸袋拥有了了塑料袋80%的性能，防油纸袋具备一定的防湿性能。

The reason why oil resistant paper bags can replace plastic products and become the packaging choice for fried and high heat food industries is not only related to oil resistance and environmental protection, but also to waterproofing. The raw material for oil proof paper bags is coated oil proof paper. We all know that ordinary paper bag packaging is easy to get wet, unlike plastic bags. When the outside is wet, the contents inside are fine, while paper bags are much worse in terms of moisture resistance. The emergence of oil proof paper bags has completely changed this defect of paper bags. Since oil proof film paper bags can quickly replace plastic bags, it is not only because of its oil proof performance, but also because oil proof paper bags have 80% of the performance of plastic bags, and oil proof paper bags have a certain degree of moisture resistance.

防湿性是指防油纸袋内层的塑料薄膜可以阻挡水蒸气透过纸袋袋。薄膜分子中不含亲水性的羟基、羧基时，就认为其防湿性好。防湿性随温度发生较大的变化。薄膜的防湿性适用于所有的肉制品包装。若产品水分以水蒸气形式从包装薄膜内侧透过来，或产品吸收从外侧透进来的水蒸气，则产品的风味、组织、内容量也会发生变化。特别是对含水分很少的干香肠类的包装，以及防止定量制品的自然损耗是极其重要的。

Moisture resistance refers to the plastic film on the inner layer of the oil proof paper bag that can block water vapor from passing through the paper bag. When the film molecule does not contain hydrophilic hydroxyl or carboxyl groups, it is considered to have good moisture resistance. The moisture resistance varies greatly with temperature. The moisture resistance of the film is applicable to all packaging of meat products. If the moisture in the product seeps through the inner side of the packaging film in the form of water vapor, or if the product absorbs the water vapor that seeps in from the outer side, the flavor, organization, and content of the product will also change. Especially for the packaging of dry sausages with low moisture content, it is extremely important to prevent natural loss of quantitative products.

防油纸袋的防水性往往与纸质的好坏有着直接的关系，纸质的鉴别一般有3种方法。

The waterproof performance of oil proof paper bags is often directly related to the quality of paper, and there are generally three methods for identifying paper.

撕裂法  横撕纸袋，有毛茬的为木浆纸，强度高；若撕裂口整齐没有毛茬，则为草浆纸或木浆成分少，强度低。

The tearing method tears the paper bag horizontally, and the paper with bristles is wood pulp paper with high strength; If the tear opening is neat without any stubble, it indicates that grass pulp paper or wood pulp has low composition and low strength.

手搓法  把纸袋浸泡在水中一段时间，取出后用两手对搓，不起毛或耐搓的表示纸质好。

The hand rubbing method involves soaking the paper bag in water for a period of time, then taking it out and rubbing it with both hands. If it does not fuzz or is durable, it indicates that the paper is good.

火烧法  火烧后，纸灰成型不散碎的纸质好；纸灰碎而不成形的纸质差。 通过这三种一般人都可以辨别淋膜纸做成的防油纸袋纸质的好坏。

After being burned, the paper ash is formed into a non shattering paper; Paper dust is broken but not formed, resulting in poor paper quality. Through these three methods, ordinary people can distinguish the quality of oil proof paper bags made of coated paper.