The wood used for making wood pulp is mostly wood waste with little other utilization value except for specially cultivated tree species. For example, the leftover materials left over from the cutting of plates and bars, the defective wood with too many twists and turns to be unusable, the intermediate wood cut down during the regular cutting and trimming of forests, and the construction waste materials taken out during the demolition of ancient wooden buildings, etc.

Generally speaking, coniferous trees such as pine and broad-leaved trees such as eucalyptus or Acacia are mainly used to produce wood pulp. The fiber of coniferous tree species is long, which is suitable for making products with high strength requirements such as paper shopping bags or envelopes, while the fiber of broad-leaved tree species is short, so the surface finish is good, which is suitable for making printing paper and household paper.

The wood used for pulping must be cut and crushed to make small wood chips, and then boiled with sodium hydroxide solution. The so-called chemical method refers to this process, which can separate cellulose and lignin. Lignin, like glue, binds cellulose together and is the main material to improve the strength of wood. The separated wood fiber is then filtered and bleached to make the wood pulp we often hear of.

For the convenience of transportation, wood pulp is not the same viscous material as slurry as we thought, but the dried and compressed fiber mass. The finished wood pulp looks like cardboard or felt, stacked together. Most paper-making factories do not produce wood pulp by themselves, but purchase from upstream manufacturers. Generally, only large paper-making enterprises will build a full set of paper-making production lines from wood pulp to paper products. More details from https://www.risingfortunepackaging.com/.