Location History:
- Bjarred, SE (1993 - 1998)
- Saltsjobaden, SE (2000)
- Hammaro, SE (1996 - 2002)
Company Filing History:
4 out of 14 
3 out of 109 
1 out of 25 Years Active: 1993-2002
Title: Innovations of Lars Stigsson
Introduction
Lars Stigsson is a notable inventor based in Hammaro, Sweden. He has made significant contributions to the field of pulp and paper technology, holding a total of 10 patents. His work focuses on environmentally friendly processes that enhance the efficiency of pulp production.
Latest Patents
One of his latest patents is the "Totally Chlorine Free Bleaching Process Using Recovered Filtrate." This invention relates to a method for producing pulp that is cooked under alkaline conditions and bleached without chlorine-containing chemicals. The process involves recovering used cooking chemicals in a first recovery installation and used bleaching chemicals in a second recovery installation. These chemicals can be regenerated and reused, promoting sustainability in the industry.
Another significant patent is the "Polysulfide Pulping Process." This method involves the impregnation and chemical digestion of lignocellulosic material, along with the recovery of pulping liquors. A spent impregnating or cooking liquor is withdrawn, and sulphurous compounds are recovered in a partial oxidation reactor. These compounds are converted into hot liquid elemental sulphur, which is then mixed with a hot sulphide-containing liquor to create a polysulphide liquor that is used for carbohydrate stabilizing impregnation and cooking at relatively low temperatures.
Career Highlights
Lars Stigsson has worked with several prominent companies in the industry, including Chemrec Aktiebolag and Kvaerner Pulping AB. His experience in these organizations has allowed him to develop and refine his innovative processes.
Collaborations
Throughout his career, Lars has collaborated with notable colleagues such as Mikael Linstrom and Nils Bernard. These partnerships have contributed to the advancement of his research and the successful implementation of his inventions.
Conclusion
Lars Stigsson's contributions to the field of pulp and paper technology are significant and impactful. His innovative patents reflect a commitment to sustainability and efficiency in the industry. His work continues to influence the development of environmentally friendly processes in pulp production.