Our industry, in brief
Specialty cellulose is a sophisticated niche business
Specialty cellulose manufacturing is essentially a refinement of the wood pulping process – a highly sophisticated refinement. Wood chips are cooked with an ammonium sulfite liquor to produce pulp, extracting lignin and other components of wood fiber. The remaining specialty cellulose is screened, bleached, washed, dried and packaged for customers.
Customers generally use specialty cellulose to make high-quality branded products. Technical expertise is a must, particularly in terms of the chemistry of the specialty cellulose we produce for each business line – cellulose ethers, cellulose acetate, nitrocellulose, and microcrystalline cellulose (MCC). Tembec’s particular focus is on the degree of polymerization and viscosity control.
|Renewable resource||Tembec manufacturing||Customer process and business|
|Softwood||Specialty cellulose production||Etherification > Cellulose|
|Acetylation > Cellulose acetate|
|Nitration > Nitrocellulose|
|Acid hydrolysis > MCC|
The difference with commodity dissolving pulp
Commodity dissolving pulp is generally used in the production of textile rayon. Unlike specialty cellulose, there is little differentiation in the manufacturing process for commodity dissolving pulp destined for different viscose customers.
Commodity dissolving pulp has more impurities than specialty cellulose. It does not require the advanced technical knowledge required with specialty cellulose production.
Specialty and commodity markets 2015:
Total world capacity 6.5 million metric tons
Two major sources of fiber for specialty cellulose – forests and cotton fields
The great bulk of global specialty cellulose production is sourced from wood fiber – a plentiful resource. A small slice of global production is represented by cotton linter pulp (CLP), sourced from cotton fiber.