How do paper umbrellas protect against rain

The umbrella surface of the paper umbrella is made of cotton paper, but why is the paper resistant to rain? One of the important media is – tung oil

Tung oil is an excellent dry vegetable oil extracted from plant fruits. It has the characteristics of fast drying, light specific gravity, good gloss, strong adhesion, heat resistance, acid resistance, alkali resistance, anti-corrosion, rust prevention and non-conductivity.

We extract tung oil from plants. After purification, extraction, and overheating, the water and other impurities in the oil are fully removed, leaving the unique components in the oil. After diluting it with a special liquid, it is fully wiped with cotton cloth on the surface of the paper umbrella. , so that it can fully absorb tung oil, placed in a cool place for 3-5 hours, after the tung oil on the umbrella surface is completely dry, the umbrella surface will appear transparent, so that the umbrella surface is attached with a layer of oil, which can play the effect of rainproof and sunshade.

The umbrella surface that has been brushed with oil is transparent and accompanied by a certain special smell, which is non-toxic and harmless. The smell will subside after the umbrella is placed in a ventilated place for 1-2 hours, which does not affect the use and rainproof effect.