Paper breaks when it gets wet, how did ancient paper umbrellas waterproof?

The story of the White Lady and Xu Xian started on the premise of an oil paper umbrella, and the paper was able to keep out the rain for several reasons.

First of all, the umbrellas are made with special paper, the full name of which is oil paper, and such paper is inherently waterproof. Oil paper is made up of hard and heavy raw paper, and in the old days people would coat it with a layer of tung oil when they used it, so it would be called oil paper. This kind of paper has the folding resistance and not reflective, the most important thing is that it has the effect of waterproof, very suitable for the production of umbrellas, while ordinary paper is a touch on the broken, also can not be waterproof can not be involved in the production of umbrellas. Therefore, people in ancient times often use this kind of oil paper umbrellas, rather than ordinary paper made of umbrellas.

In addition to this, there is another reason is that the ancient production of paper, is mainly the use of bark, cotton and linen and so on very stretching effect of raw materials, of course, the price of this raw material is also very high. They produced paper texture will also be very thick, similar to the paper we use now carton packaging paper. This kind of paper has a certain waterproof effect, but in the rainstorm attack, this kind of paper will not work at all, also out of the situation will indeed appear broken.

Oil paper is still used to a large extent in today's production life, for example, the current construction site, may be in the rain when the choice of oil paper to cover the building materials, of course, now the cost of oil paper will be lower. Most of the umbrellas sold on the market now are made of waterproof cloth umbrellas, this kind of umbrellas, compared to the traditional oil paper umbrellas are stronger, but our traditional oil paper umbrellas are now in constant development to add a lot of cultural flavor, but also very popular with people.