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The raw material is long fibered softwood fluff pulp in roll form. The pulp are defibrized in a hammermill. Defibration is the process of freeing the fibres from each other before entering the papermachine. Important parameters for dry defibration are shredding energy and knot content. Normally an air-laid paper consists of about 85% fibre.
Wood-free paper is used in a variety of applications: Writing and printing papers: Wood-free paper is the most common type of paper used for writing and printing. [23] It is available in a variety of weights and finishes, making it ideal for a variety of applications [17] Envelopes: Wood-free paper is the most common type of paper used for ...
Use of recovered paper increased in the 1970s mainly in graphic and hygienic papers, and accelerated in the 1980s. The annual growth in use of recovered paper increased by 6% between 1980 and 1996. The use of virgin fibres only increased 2% in the same period. In 1997 recovered paper production was 42% of the total paper production. [2]
Fluff pulp was first developed for use in disposable sanitary napkins. [2] Kotex's first advertisement for products made with wood pulp (Cellucotton) appeared in 1921. [3] Disposable diaper producers also were early to convert to fluff pulp because of its low cost and high absorbency. Normal usage of fluff pulp in a diaper was about 55 percent.
The kraft process (also known as kraft pulping or sulfate process) is a process for conversion of wood into wood pulp, which consists of almost pure cellulose fibres, the main component of paper. The kraft process involves treatment of wood chips with a hot mixture of water, sodium hydroxide (NaOH), and sodium sulfide (Na 2 S), known as white ...
Insects and pests can destroy woodblock prints by eating through the paper or leaving droppings that stain the paper. A common cause of holes in Japanese woodblock prints is the deathwatch beetle (Xestobium rufovillosum). These beetles were commonly found in wood used to build furniture in the Edo period. Woodblock prints that were stored on ...