BASE PAPER FOR PRESS POCKET TYPE CARRIER TAPE

摘要

PROBLEM TO BE SOLVED: To provide a base paper for press pocket type carrier tape small in paper thickness change due to humidity change.SOLUTION: There is provided a base paper for press pocket type carrier tape having a surface layer, at least one intermediate layer and a back layer, where the intermediate layer or the intermediate layer and the back layer are layer containing needle-leaved tree bleached kraft pulp (NBKP) of 35 mass% or more as a raw material pulp, freeness of the raw material pulp is 300 mL to 440 mL. The layer containing the needle-leaved tree bleached kraft pulp of 35 mass% or more as the raw material pulp preferably contains further broad-leaved tree bleached kraft pulp (LBKP) of 30 mass% to 65 mass% as the raw material pulp. The surface layer and the intermediate layer contain preferably a wet paper strengthening agent and a sizing agent respectively.SELECTED DRAWING: Figure 1