| 摘要 |
PURPOSE:To provide a tape fastener base material reduced in a lowering of tearing strength and generating no delamination by using a long fiber nonwoven fabric composed of a core-sheath type composite fiber wherein polyester is core a component and polyolefin is a sheath component. CONSTITUTION:When a long fiber nonwoven fabric composed of a core-sheath type composite fiber wherein polyester whose main repeating unit is composed of ethylene terephthalate is a core component and polyolefin is a sheath component is subjected to calendar processing at temp. equal to or less than the m.p. of polyolefin, the polyolefin component flows to fill the fiber gaps constituting the nonwoven fabric. Herein, since the polyolefin resin is not perfectly melting and the flexibility of the fabric remains, a lowering of tearing strength is reduced. Further, since the nonwoven fabric is composed of the core-sheath type composite fiber and the difference between the melting points of the polymers constituting the core and sheath component is large, the pressed part at the time of hot press bonding by a hot emboss roll is not made plastic perfectly and a temp. condition capable of bonding fibers can be properly selected. Therefore, the interlayer delamination of the nonwoven fabric can be prevented. |
