HONEYCOMB FILTER

PROBLEM TO BE SOLVED: To provide a honeycomb filter which can achieve both low pressure loss and high collection efficiency.SOLUTION: A honeycomb filter 100 includes: a columnar and porous honeycomb structure which forms a plurality of first flow channels and a plurality of second flow channels; a plurality of first sealing parts which close the respective first flow channels on one end side of the honeycomb structure; and a plurality of second sealing parts which close the respective second flow channels on the other end side of the honeycomb structure. The first sealing parts and the second sealing parts satisfy all of the following conditions. (a) A length in a direction along the flow channel is 0.3-1.8 mm. (b) Porosity is 60-70%. (c) A pore diameter D90 is 30 μm or less. In regard to the pore diameter, 90% of an entire pore volume of the sealing parts have a pore diameter smaller than the pore diameter D90.SELECTED DRAWING: Figure 1 【課題】低い圧力損失及び高い捕集効率の両立が可能なハニカムフィルタを提供する。【解決手段】このハニカムフィルタ１００は、複数の第１流路及び複数の第２流路を形成する柱状で多孔質のハニカム構造体と、前記ハニカム構造体の一端側で各前記第１流路を閉じる複数の第１封口部と、前記ハニカム構造体の他端側で各前記第２流路を閉じる複数の第２封口部と、を備える。前記第１封口部及び前記第２封口部が以下の条件を全て満たす。（ａ）流路に沿う方向の長さが０．３〜１．８ｍｍである。（ｂ）気孔率が６０〜７０％である。（ｃ）細孔径Ｄ９０が３０μｍ以下である。ただし、細孔径Ｄ９０とは封口部の全細孔体積の９０％がそれよりも小さな細孔径を有している細孔径である。【選択図】図１