Abstract
In the paper industry, the pitch removal technology is important. There are some methods for the pitch removal. In this report, the method using talc is described which is applied generally in the world. Molecular structure, morphology and basic properties of talc are indicated. And it is shown how to manufacture talc powders from raw material. This report also contains production quantity of talc in the world, import quantity to Japan, estimated consumption of talc in the world and Japan, and consumption of talc in the paper industry.Talc is consumed in large quantities as a filler and a pitch control agent in the paper industry. The data of contact angle between talc and several liquids are quoted in connection with the pitch control ability of talc. Not all of the talc powders may be effective for the pitch control agent. Properties of talc are dependent on the production place of raw material and the condition of grinding by mill. Anyway it is indicated that the pitch control ability depends on the specific surface area of the talc.
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