Comparison of Chemical Pulp, Mechanical Pulp and Chemi-mechanical Pulp

Pulping refers to the process that use chemical, mechanical or chemi-mechamial ways to remove the unnecessary impuritie in the fiber materials. Genrally, paper pulping process can be classified into pulp cooking, pulp washing and pulp bleaching. As we know, there are a numbers of paper pulp manufacture methods, they are can be summed up into three main types including chemical pulp, mechanical pulp and chemi-mechanical pulp.

Chemical pulp

The chemical pulp is the most widely used pulping way in the paper and pulp making. Sulfate pulp and sulfite pulp are two typical types of chemical pulp.

sulfate pulp: sulfate pulp can apply for water-absorbing products manufacture, it also used to process the paper or paper board with high tensile strength, tearing strength, burst strength. Fluff pulp is the standard type of the sulfate wood pulp. Fluff pulp is made from the wood fiber, but the linters. Fluff pulp made from the chemical pulping has high purity and good absorbability. In the global trade, most of fluff pulp is sulfate pulp and all be bleached.

sulfite pulp: sulfite pulp is a kind of chemical pulp made by sulfite process. It is clean and soft, easy to bleach. According to the process, sulfite pulp can be applied to manufacture the artificial fiber, writing paper, print paper, grease-proof paper and glazed transparent paper.

Mechanical wood pulp

Mechanical wood pulp also known as ground wood pulp, it plays vital role in the paper and pulp indstry. Mechanical pulp is obtained by grindingfiber material with mechanical means. The mechanical wood pulp has high content of lignin, short fiber makes it fragile. Mechanical pulp is usually used with chemical pulp together to manufacture paper like news paper.

Chemi-mechanical pulp

Chemi-mechanical wood pulp made by grinding wood chips, shavings into fibers with grinder. For understanding the fiber, formally add a little chemicals in the preprocesing or pulp processing.