Flotation Deinking Machine In Waste Paper Recycling

How Does a Flotation Deinking Machine Remove Ink from Waste Paper Pulp?

In the waste paper recycling industry, deinking is a key step that determines the quality of recycled pulp. The flotation deinking machine, as the core equipment in this process, separates ink particles from fibers through physicochemical processes, providing technical support for converting waste paper into high-value pulp.

What Is Flotation Deinking Machine?

A flotation deinking machine is a specialized device that uses the flotation principle to remove hydrophobic impurities such as ink particles, adhesives, and dust from waste paper pulp. Its basic working principle is as follows: a large number of microbubbles are introduced into the pulp. The hydrophobic substances, such as ink particles, adhere to the surface of the bubbles and rise to the pulp surface with the bubbles, forming a foam layer. The foam is then discharged by scraping or overflow, thus achieving separation from the fibers.

The advent of flotation deinking machine has transformed waste paper deinking from an early, extensive method primarily based on washing to a highly efficient and water-saving fine separation method. Compared to washing methods, flotation significantly reduces fiber loss—theoretically only about 5% of the total waste paper volume—and also requires less clean water.

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