By Monica Ek
ISBN-10: 3110213397
ISBN-13: 9783110213393
This 4 quantity set covers the whole spectrum of pulp and paper chemistry and know-how from beginning fabric to tactics and items together with marketplace calls for. This paintings is key for all scholars of wooden technological know-how and an invaluable reference for these operating within the pulp and paper or at the chemistry of renewable resources.
Volume three offers an summary of paper creation and the ways that the chemistry of beginning fabrics and approaches impression its caliber and homes. The paintings treats
- fundamental houses of the fibre wall and the consolidation of fibres in the course of urgent and drying,
- surface chemistry of fibres and their effect at the interplay among fibres/paper and different fabrics,
- mechanisms at the back of the adsorption of polyelectrolytes to fibres and fillers,
- acid and alkaline sizing of paper,
- basic fluid mechanical habit of fibre suspensions,
- web forming, net urgent and internet drying in a latest paper computing device,
- calandering and coating of paper.
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Additional info for Wood Chemistry and Wood Biotechnology (Pulp and Paper Chemistry and Technology)
Example text
Pines (Pinus radiata) have, however, been introduced. Australia has nevertheless some of the most ancient conifer species. 8). 3), but also for some other monocotyledonic trees as the Australian grass tree and lily trees. Bamboo can be seen as a special case of this type. 8). Since they are not important as raw material for the pulp and paper industry18 with the important exception of bamboo, they will not be discussed further. All other types of trees (maidenhair tree, conifers, gnetophytes, most hardwoods) are of either spruce- or oak type.
The main differences between non-wood and wood composition are the contents of lignin, extractive and inorganic material. In general, non-wood plants have lower amount of lignin, which makes them easily delignified. Some agricultural fibres have high amounts of extractives on the other hand, that is a drawback, causing problems in pulping and papermaking equipment. 1 %, whereas it can amount up to 5 % in non-wood. The main inorganic compound is silicon dioxide, leading to scaling in the pulping equipment.
Shelterwood. Tall, storm resistant trees, mainly pine and occasionally hardwood, are chosen for high shelterwood. For low shelterwood, the hardwood appearing after harvesting timber is used to protect plants against frost. 42 The above-mentioned methods are based on harvesting practically all the timber in the cutting area, except for seed trees or shelterwood. Other forestry methods are gaining interest, calling for more expert knowledge and long-term planning. They include for example edge felling of spruce forest, in which 10–20 m wide rows are cut with 5–10 years intervals.