Application methods of optical brighteners for papermaking
There are three application methods: Pulp whitening: (The dosage is generally about 0.05%~0.2% of the dry pulp weight, pH value 7~8) Disulfonic acid varieties are suitable for neutral or alkaline papermaking, such as C.I., 85, 113, 134, etc.; Acidic papermaking requires Optical brighteners to be stable to acid and aluminum sulfate, and tetrasulfonic acid varieties […]
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