| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester binder fiber used for obtaining a wet nonwoven fabric for a filter reduced in its shrinkage at time of drying or heat treatment in a papermaking process and excellent in nonwoven fabric properties (strength, or the like). SOLUTION: The polyester binder fiber for use in the wet nonwoven fabric for the filter has a fiber length of 3-25 mm and a sheet area shrinkage factor defined as follows of 30% or less. Herein, the sheet area shrinkage factor (%) is a value calculated according to ä(A<SB>0</SB>-A<SB>1</SB>)/A<SB>0</SB>}×100. A<SB>0</SB>in the formula is the area of a sheet before shrinkage treatment and A<SB>1</SB>is the area of the sheet after shrinkage treatment. Herein, the sheet has a weight basis of about 50g/m<SP>2</SP>and is formed from an aqueous dispersion containing 80 wt.% of the polyester binder fiber and 20 wt.% of NBKP using a square sheet machine and subjected to slackening and shrinkage treatment at 120°C for 5 min by a hot air circulating type dryer after dried. Further, the wet nonwoven fabric for the filter contains 5-50 wt.% of the polyester binder fiber. COPYRIGHT: (C)2004,JPO&NCIPI
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