Stephen H Levis

Title: Innovations in Wood Pulp Bleaching: The Contributions of Stephen H. Levis

Introduction

Stephen H. Levis is an accomplished inventor based in Haverhill, MA (US). He has made significant contributions to the field of paper pulp processing, particularly in the area of bleaching mechanical wood pulp. His innovative approach has led to the development of a unique process that enhances the brightness of wood pulp.

Latest Patents

Levis holds a patent for a process titled "Process for bleaching mechanical wood pulp with sodium hydrosulfite." This patent describes a method where the pulp is treated in one or more refiners with a sodium hydrosulfite bleach liquor in the presence of a strong alkali, such as NaOH. The process ensures that the bleaching solution maintains an alkaline pH, preferably between 10 and 12. The pulp is discharged from the refiner at a pH of about 5 to 6, resulting in a brightness gain of at least 8 to 13 ISO points in the refiners.

Career Highlights

Stephen H. Levis has dedicated his career to advancing the technology behind paper pulp refining and bleaching. His work at Morton Thiokol Inc. has been instrumental in developing efficient and effective methods for improving the quality of wood pulp. His innovative techniques have set new standards in the industry.

Collaborations

Levis has collaborated with notable colleagues, including Thomas Joachimides and Bert A. Edstrom. These partnerships have fostered a collaborative environment that encourages innovation and the sharing of ideas.

Conclusion

Stephen H. Levis is a prominent figure in the field of paper pulp processing, with a patented process that significantly enhances the bleaching of mechanical wood pulp. His contributions continue to influence the industry and improve the quality of paper products.