What is tissue paper?
The so-called wet strength tissue paper, refers to the addition of wet strength of the paper. General judgment of wet strength paper, there are the following standards:
Wet/dry strength (tensile strength)>20%;
Paper that remains at least 15% dry strength and resistant to rupture or dissociation when wet or immersed in water.
Different products also have other properties, such as high stiffness and printability, good smoothness, especially appearance properties (such as holes, stains and dust, etc.).
In the process of chemical wood pulp or cotton pulp copying, wet strength is obtained by adding wet strength agents such as melamine resin and polyepichlorohydrin.
Ground drawings (Marine drawings), special waterproof requirements of the recording paper, banknote paper also belongs to a large category of wet strength paper.
Wet strength agent is the earliest use of UF resin, the MF resin, because contain a large amount of formaldehyde, and need in acidic system, can have very good wet strength effect, so gradually the UF and MF resin to be eliminated, and the use of gradually PAE or call the PPE resin, the resin can be in a neutral system can obtain good effect of wet strength, and do not contain formaldehyde.