ENVIROCELL TRAINING

ONE DAY ON-SITE SEMINAR FOR PRODUCTION PERSONNEL

PRACTICAL PAPERMAKING CHEMISTRY

This seminar is aimed at production personnel who may have little or no formal knowledge of chemistry, but who may have accumulated a lot of practical know-how over the years of working around paper machines. It may also be quite useful as an introductory refresher to others who may have had some chemical training, but who have been away from this area for some time. Although the emphasis throughout is on the practical side of papermaking chemistry, some of the underlying fundamental principles (particularly on colloid and polymer chemistry) are touched on to make sure that the foundations of papermaking chemistry are appreciated. The concept at the heart of optimising wet end chemistry is retention, which is taken as a central pivot for many of the discussions in each of the linked sessions.

PROGRAMME

Session 1: Key aspects of paper chemistry

· introduction on definitions, scope and terminology

• wet end and dry end chemistry
• colloid chemistry and wet end interactions

Session 2: General wet end chemistry

· retention concepts

· water management and closing up effects

· sources and control of problematic substances

· chemical measurement and monitoring at the wet end

Session 3: Chemistry of mill raw materials

· fresh water

· fibre and filler

· sizing chemicals

· dry and wet strength agents

· colorants and brighteners

· retention and drainage aids

· deposit and foam control agents

· size press and coating additives

Session 4: Chemistry of mill processes and products

· raw material dosing and water use

· wire and machine retentions

· chemical data from machine monitoring

· problem solving and opportunities for improvement.