The Characteristics of Kraft Pulping of the Lop Woods of Catalpa bungei C.A.Mey.

In this paper,the characteristics of kraft pulping and papermaking of the lop woods of three different clones Catalpa bungei C.A.Mey.with two diameter grades were studied.The results showed that the optimum alkali dosages for the lop wood with bigger diameter and smaller diameter are 21% and 22%,respectively.Under this cooking conditions,the unbleached kraft pulps,with kappa number of 21 and pulp yields of 41% and 34% respectively,can be obtained.With the same cooking conditions,there are obvious differences of pulping characteristics for the lop woods with two different diameter grades;however,there are no big differences in kappa number,pulp yield and reject ratio for different clones of Catalpa bungei C.A.Mey..It is relatively harder to bleach the lop wood of 8401,while the bleachabilities of 8402 and Golden Catalpa bungei C.A.Mey.lop woods are better.

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