A porous pipe having an excellent absorbing and draining function, a producing
apparatus capable of producing a porous pipe at high speed and low cost, and a
method of producing a porous pipe are provided. The porous pipe is a pipe formed
by spirally winding a tape. The pipe is formed by a hole forming portion 13
for forming a recess or a notch or a hole in the tape 2 molded by a
tape molding portion 11, and the hole forming portion 13 is located
between the tape molding portion 11 and a pipe forming portion 12 so
that the tape 2 is molded, holes 6 are formed, and a pipe 1 is
formed continuously. The holes 6 are formed into a predetermined shape by
elongating the hole 6 from a side of the pipe forming portion 12.
In the pipe 1 formed thereby, a peripheral wall portion of the hole 6
is gradually thin-walled toward an outer peripheral face of the hole.
