Plastic Industry / Reuse of Cleaning Water: Interview with Hagiwara Industry Co., Ltd.

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■Issue: How to remove foreign substances from the washing water of blue sheets The plastic industry is currently facing environmental issues such as CO2 emissions from manufacturing and incineration, as well as the problem of plastic waste, due to its reliance on petroleum-derived materials. As the top domestic manufacturer of blue sheets, which are plastic products, the company has launched Japan's first used blue sheet recycling project, "ReVALUE+," as part of the industry's overall promotion of SDGs. A major challenge in this project was the "foreign substance separation issue," which involved how to remove foreign substances (such as soil and sand) from the washing water of blue sheets. ■Reason for Selection: High performance, maintainability, improvement of work efficiency and environment There are several methods for separating foreign substances from dirty washing water. The company conducted experiments using various methods but was unable to achieve satisfactory results. Just when they were about to give up, they were introduced to FILSTAR by another company. Upon conducting experiments, they found that it had separation performance beyond their expectations. Furthermore, the fact that it does not require cleaning or replacing dirty filters promised significant improvements in maintenance, work efficiency, and work environment, which became the decisive factor for selection and implementation. ―Please download to see the continuation―

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Applications/Examples of results

■Painting Factory Collection of paint sludge and paint residue Reduction of cleaning burden inside tanks Suppression of odors caused by the accumulation of paint sludge ■Machinery Industry Removal of cutting powder and sludge inside tanks Collection of abrasive grains from grinding machines ■Automotive Industry Removal of foreign substances during cleaning on the painting line ■Water Treatment Industry Removal of foreign substances such as sand and debris from groundwater, industrial water, well water, and storage tanks Removal of foreign substances from cooling tower circulating water ■Chemical and Pharmaceutical Industry Removal of foreign substances and recovery of products during the manufacturing line Replacement of sedimentation tanks in the chemical material manufacturing process ■Semiconductor Industry Separation and recovery of diamond polishing agents Separation, recovery, and classification of glass powder during LCD panel cleaning Recovery of plated materials in the liquid during the gold plating process on substrates Removal of foreign substances from copper plating bath water in IC packaging Removal of foreign substances from circulating water in scrubbers during factory exhaust gas treatment ■Food Industry Removal of foreign substances mixed in the manufacturing line Collection of skins from vanilla beans and removal of seeds Separation and recovery of burnt residues from cooking oil Removal of activated carbon from sake ■Jewelry Industry Recovery of precious metals from washing water