Wisewoods Adds Second Dieffenbacher Z-Sifter In Thailand 

Wisewoods Co. Ltd. has commissioned a second Dieffenbacher Z-Sifter with Dryer Discharge Conveyor (DDC) for optimized material feeding at its medium-density fiberboard (MDF) site in Khao Yoi, Thailand, replacing two conventional sifters in an existing production line. The investment further enhances the processing of rubberwood, which is used as the raw material for 99% of the company’s products. It follows the successful start-up of Wisewoods’ new Cebro MDF plant from Dieffenbacher in August 2024, which was also equipped with a Z-Sifter for efficient processing of the challenging raw material.

“Since the latex residue in rubberwood usually has almost the same density as the wood fibers, conventional sifters, while effective at removing glue lumps, metals and large pieces of fiber, cannot remove the latex residues,” explains Visarut Palarit, Deputy Director at Wisewoods. “That’s why we rely on the Dieffenbacher Z-Sifter, which has a zigzag profile and was specifically developed for producing MDF from rubberwood. The Z-Sifter effectively removes most of the latex stains from our finished product,” he says.

For many years, the Z-Sifter has been a success story for Dieffenbacher, particularly in Southeast Asia. Over the past decade, the German machinery and plant manufacturer has supplied 15 of these “rubberwood specialists” to customers in Thailand, Vietnam, Malaysia and Indonesia. By the end of 2026, four additional Z-Sifters with DDC for optimized material feeding are scheduled to start operation in Thailand, including two at Panel Plus in Songkhla and two at Metro-Ply MDF in Surat Thani.

“In addition to enhancing product quality, we were able to reduce energy consumption in this area by around 50%. That’s because we have replaced two old sifters with one new Z-Sifter without any loss of capacity,” Palarit concludes.