Method for improving removal effect of stickies in waste paper pulp

Abstract

The invention discloses a method for improving a removal effect of stickies in waste paper pulp. The method comprises the steps of: breaking waste paper comprising the stickies accounting for less than or equal to 10 percent of the weight of the waste paper at the temperature of between 40 and 60 DEG C first; placing pulp obtained after the breaking into a pulp screen, and screening the pulp under the condition that the screening water temperature is between 40 and 60 DEG C; and diluting accepts obtained after the screening until the weight concentration of the paper pulp is between 0.8 and 1.5 percent, adding 0.01 to 0.5 percent of nonionic surfactant into the pulp based on the absolute dry mass of the paper pulp, adding 0.0025 to 0.5 percent of anionic dispersant, and floating at the temperature of between 40 and 50 DEG C after the mixture is stirred uniformly, wherein the anionic dispersant is one of anionic polyacrylamide, polyacrylate and polymethacrylate. The method has a more remarkable effect on the removal of the stickies such as pressure-sensitive adhesives and hot melt adhesives in most of waste paper pulp comprising an ONP, an OMG, an MOW and the like.

Description

technical field

[0001] The invention relates to the removal of stickies in waste paper pulp, in particular to a method for improving the ink removal effect in waste paper pulp. It belongs to the technical field of secondary fiber recycling. Background technique

[0002] Adhesives in waste paper are a major problem plaguing the paper industry today. In recent years, with the rapid development and wide application of labels containing adhesives and various coated papers, adhesives have entered waste paper The characteristics of size, shape and viscosity after the circulation system have also become various, which has a serious impact on the operation of the paper machine and the quality of the paper, making the sticky problem faced by the waste paper recycling system increasingly serious. Therefore, Effectively removing stickies and reducing their negative impact on paper machine parts has become the main task of stickies control in the current waste paper recycling process. ...