Mold, process of molding, and article molded by such process
OwnerJ. Larry Underwoodinventor
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Abstract
An article having a flange is molded between a mold core and a unitary mold cavity, the flange being formed during the process as a consequence of the existence of an undercut existing in a first surface of the cavity. A ridge is provided on a second surface of the mold cavity adjacent the undercut. A fluid, i.e., air, is injected between the cavity and the molded article as the core and cavity separate in such a volume and at such a pressure as will maintain the article in substantially complete and constant contact with the core as the core and article are withdrawn from the cavity. The flange conforms to the cavity wall until the article is free from the cavity, and subsequently the molded article is separated from the mold core.
Claims13
A process for molding an article having a flange between a mold core and a unitary mold element which cooperates with the mold core to form a mold space, the flange being formed during the process as a consequence of the existence of an undercut existing in a first surface of the unitary mold element, the process comprising the steps of:
- providing a ridge on a second surface of the unitary mold element adjacent the undercut,
- injecting a fluid between the unitary mold element and the molded article as the core and unitary mold element separate in such a volume and at such a pressure as will maintain the article in substantially complete and constant contact with the core as the core and article are withdrawn from the unitary mold element, the flange conforming to the unitary mold element wall until the article is free from the unitary mold element, and subsequently
- separating the molded article from the mold core.
A process for molding an article incorporating a flange using a mold unit including a unitary mold element which cooperates with a mold core to form a mold space within which the article can be molded, the mold core being displaceable in a predetermined direction relative to the unitary mold element for the purposes of enabling removal of the molded article and incorporated flange from the unitary mold element characterized by the steps of
- providing a first surface of the mold element with a recessed or undercut region for forming the flange during the molding of the article,
- providing on a second surface of the mold element adjacent to the undercut region means for releasing the flange from the undercut region during the withdrawal of the mold core and the article from the mold space,
- pressurizing the interior of the mold space during the displacement of the core along said direction, by means of a fluid which is of such volume and pressure as to ensure that the molded article moves with the core during its displacement in said direction, and
- upon the freeing of the flange from the mold space, permitting the flange to return into its required position or setting with respect to the remainder of the article.
Dependencies are inferred from the claim text.