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Paper recycling in an increasingly environmentally conscious world is gaining importance. Increased recycling activities are being driven by robust overseas markets as well as domestic demand.
Recycling technologies have been improved in recent years by advances in pulping, flotation deinking and cleaning/screening, resulting in the quality of paper made from secondary fibres approaching that of virgin paper. The process is a lot more eco-friendly than the virgin-papermaking process, using less energy and natural resources, produce less solid waste and fewer atmospheric emissions, and helps to preserve natural resources and landfill space.
By using recycled paper, companies can take a significant step toward reducing their overall environmental impacts. This study deals with the scientific and technical advances in recycling and deinking including new developments.
You'll find out about the latest on:
- Paper recycling and how new developments will affect your business
- Recycled fibre processes for different types of paper and board grades
- The effects of recycled fibre on paper machines and the control of stickies
Contents include:
Introduction
- Aspects of paper recycling and the challenges ahead
- Advantages of recycling
- Recycling statistics
- Challenges for paper recyclers
Process steps in recycled fibre processing
- Process steps and equipments for recycled fibre processing
- Slushing and pulping
- Deflaking
- Refuse removal
- High-density cleaning
- Coarse and fine screening
- Flotation
- Washing
- Thickening
- Kneading and dispersion
- Fine cleaning
- Deinking processes
System and process design for different paper and board grades
- Fine paper systems
- Market pulp systems
- Standard newsprint and improved paper grades
Effects of recycling on pulp quality
- General effect of recycling on chemical and mechanical pulps
- Factors affecting the recycle potential
- Methods for enhancing the strength of recycled fibres
Chemicals used in deinking systems and their function
- Alkali
- Stabilizers
- Hydrogen peroxide
- Surfactants
- Dispersion agents
- Collecting chemicals
- Frother
- Defoamer
- Calcium salts
Enzymatic deinking
- Enzymes for deinking
- Possible mechanisms of enzymatic deinking
- Performance of enzymes in deinking
- Effect of enzyme on quality of fibre and paper
- Effect of enzyme on pulp yield
- Effluent characteristics and treatability
- Benefits and limitations
- Conclusions
Bleaching of deinked pulp
- Bleaching with chlorine-containing chemicals
- Chlorine free bleaching
Refining of recycled fibres
- Effect of refining on different recycled fibres
Effects of recycled fibre on paper machines
- Effect on machine runnability
- Sheet properties
Control of stickies
- Problems due to stickies
- Control of stickies
- Additives