Patent ID: 6440352
Filing Date: 2002-08-27
Classification: B41J

Abstract:
A manufacturing method for a liquid container capable of generating a negative pressure, wherein said liquid container includes:an outer wall; and an inner wall having an outer surface equivalent to an inside surface of the outer wall and having a liquid accommodating portion capable of containing liquid therein, and liquid supply portion for supplying the liquid out of the liquid accommodating portion; wherein said liquid container has a polygonal cross-section having sides and corner portions, said method comprising the steps of: providing a mold corresponding to an outer shape of the liquid container; providing a substantially cylindrical shaped first parison for the outer wall, said first parison having a diameter smaller than that of the mold; providing a substantially cylindrical shaped second parison for the inner wall; and expanding the first and second parisons by injecting air so that a thickness of the inner wall in a corner portion is smaller than that in a central portion of each side, so that the first parison extends along the mold, so that the inner wall and the outer wall are separable from each other, and so that a space defined by the inner wall and a space defined by the outer wall are similar in configuration to each other.