公开(公告)号：US4954002A

公开(公告)日：1990-09-04

申请号：US776095

申请日：1985-09-17

申请人： Philip Wallis ,  Robert E. Burkhalter ,  Thomas D. Hall

发明人： Philip Wallis ,  Robert E. Burkhalter ,  Thomas D. Hall

IPC分类号： B43K5/18 ,  B43K7/08 ,  B43K7/10 ,  B43K8/04

CPC分类号： B43K5/18 ,  B43K7/08 ,  B43K8/04

摘要： In a writing instrument including an ink reservoir and an air hole, the air hole is spanned by a barrier formed as a porous non-absorbent ink repellent membrane of substantially uniform pore size. The barrier is non-porously sealed, for example by direct heating or ultrasonic welding, along its entire periphery to the wall of the air hole, the barrier allowing air to pass freely therethrough in both directions, but preventing escape of ink therethrough and therearound. The barrier is preferably formed of polytetrafluoroethylene with a pore radius of not more than 10 .mu.m and a thickness of not more than 200 .mu.m. The ink for use in the writing instrument preferably has a surface tension of not less than 30 mN m.sup.-1, a viscosity of not more than 10 cp and a wetting angle with the barrier of not less than 100.degree..

摘要翻译： 在包括墨水储存器和空气孔的书写工具中，空气孔被形成为具有基本上均匀的孔径的多孔非吸收性疏油墨膜形成的屏障跨越。 屏障是非密封的，例如通过直接加热或超声波焊接，沿着其整个周边到空气孔的壁，该屏障允许空气沿两个方向自由地通过，但是防止油墨通过其中和其周围逸出。 阻挡层优选由孔半径不大于10μm并且厚度不大于200μm的聚四氟乙烯形成。 用于书写工具的墨水优选具有不小于30mN m-1的表面张力，不大于10cp的粘度和不小于100°的屏障的润湿角。