Twin-screw pulp-production systems, developed by Clextral for over 30 years, enable paper-industry manufacturers to produce high-quality special-grade pulp for writing and printing papers. Clextral systems are especially efficient for processing cotton linters to produce the consistent features and achieve the right “look-and-feel” for these prestigious papers. Manufacturers throughout the world, and in particular papermakers in cotton-producing areas in Africa and Asia, have adopted this technology to create added value and new business locally.
Long fibers annual plant fibers, such as cotton linters, hemp, flax and sisal enable the production of especially robust and sophisticated papers because they provide very resistant cellulose of exceptional strength. Cotton linters are fine, silky fibers that are attached to the seeds of the cotton plant after ginning. These fibers typically are usually short (3 mm) and are traditionally used as the preferred raw material in the manufacture of cellulose for high-quality writing and printing paper. Other fibers, such as esparto grass (also known as alpha or needle grass), can be added to certain writing and printing papers to improve their inking absorption performance, resistance to shrinkage and folding properties.
Clextral twin-screw process features
Clextral twin-screw pulp processing offers major advantages for making writing and printing paper:
- Very high quality papers with specific printability features
- Optimized pulp yield, through continuous processing
- Versatility in the use of cotton linters and other annual plants as raw materials
- Cost effective and environmentally-friendly manufacturing
- 10 to 15% reduction in energy consumption
- 10 to 30% decrease of chemicals
- Reduced water consumption
- Compact turnkey installation, requiring less floor space and simplifying engineering requirements
Clextral also offers its expertise and inhouse facilities to enable papermakers to develop and test new concepts and improve processing.