Irrigation hose

Claim 1

In an irrigation hose which is produced by melt-sticking a double layer thermoplastic resin film in a plane along longitudinal parallel lines so as to form at least two passages, one of said passages being a constant pressure passage and the other being a supply passage, said supply passage and constant pressure passage being connected by first communicating holes which are formed by first non-melt-stuck portions of said film spaced in a melt-stuck line provided between the supply passage and the constant pressure passage, said constant pressure passage having water-irrigating holes which are formed by second non-melt-stuck portions of said film spaced in an outside melt-stuck line defining a boundary of said constant pressure passage, the improvement which comprises providing first small melt-stuck portions in said film in the vicinity of said water-irrigating holes, the dimension in the longitudinal direction of the hose of each of said first small melt-stuck portions being 0.5 to 3 times as long as the dimension of said water-irrigating holes in the longitudinal direction of said hose, said first small melt-stuck portions being located so that a peripheral portion of each first small melt-stuck portion contacts with a circle having a radius which is 0.5 to 2 times as long as the dimension of said water-irrigating holes in a longitudinal direction of said hose, the center of said circle being at the inside end of an associated second non-melt-stuck portion of said film forming a said water-irrigation hole.