Chip Requirements from the Pulp Mill’s Standpoint

Specifications for pulp chips customarily dictate the kind of wood, moisture content or age, freedom from bark and charred wood, and uniformity of size. Each kind of wood has different pulping characteristics. Old chips yield less fiber, make weaker paper, and need more chemical and time during cooking. Bark has little or no fiber value; it and charred wood impair cleanliness of pulp. Chip size affects yield and strength of pulp and ideally should be uniform, particularly in the fiber direction. Southern pine chips that pass a 3/4 inch screen and are retained on a 1/2 inch screen are of most desirable size for kraft pulp. There are some disadvantages to using chips from sawmills, but there can be mutual benefit to both parties concerned.

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