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US 11,560,672 B2Granted
Methods for deinking UV prints
AssigneeNippon Paper Industries Co., Ltd.
InventorsHirohiko Koizumi, Masato Takayama, Seiki Yoneshige, Shisei Goto
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Abstract
The present invention aims to develop a technique for efficiently preparing deinked pulp from prints made with UV-curable inks. According to the processes for preparing deinked pulp of the present invention, high quality deinked pulp can be obtained by performing the steps of: disintegrating printed waste paper containing UV prints in water to give a waste paper slurry; and applying a mechanical process to the waste paper slurry using a rotary disintegrator.
Claims7
A process for preparing a deinked pulp, comprising the steps of:
- disintegrating printed waste paper containing UV prints in water to give a waste paper slurry;
- and
- applying a mechanical process to the waste paper slurry having a solids content of 0.5 to 5.0% by weight using a rotary disintegrator;
- wherein the rotary disintegrator comprises stationary blades and rotating blades, so that inks can be detached/pulverized from a waste paper pulp when a feed stream passes between the stationary blades and the rotating blades, and
- wherein the rotating blades have a blade width of 1.0 to 10 mm, and the stationary blades have a blade width of 0.3 to 2.0 mm.
2 more elements
Dependencies are inferred from the claim text.