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US 4,976,900 AGranted
Method and apparatus for gushing air stream into metal molds in injection molding machine
AssigneeSanri Kabushiki Kaisha
InventorShigeru Tsutsumi
Life of this patent
Estimating the term…
Abstract
A method and an apparatus for injecting a steam into a mold in an injection molding machine by injecting a desired stream toward the opening of the metal mold including a gate and cavities in connection with the opening and closing operation of the metal mold thereby intending the cooling solidification of the molten resin on th gate portion and simultaneously intending removal of dewing and an oily matter on the surface of the metal mold.
Claims15
A method of injection molding, comprising the steps of:
- injecting a hot molten substance through a gate into a cavity defined by opposing surfaces of a metal mold, said metal mold being repeatedly opened and closed;
- and
- solidifying said hot molten substance by cooling, thereby yielding a molded article;
- wherein said method comprises the further step of gushing a stream of gas towards both said substance and both of said opposed surfaces of said metal mold each time each metal mold is opened, adequate to simultaneously aid cooling of said substance and remove dew and oily matter from said at least one mold surface by impingement of said gas;
- said stream of gas is also gushed towards said gate, adequate to cool and solidify a portion of said substance facing said gate, thereby clogging said gate.
2 more elements
An injection molding machine comprising:
- a mold adapted for repeated opening and closing, comprising a pair of opposed mold surfaces defining between them a mold cavity;
- a gate allowing entry of a hot molten substance into said mold cavity, said substance being of the type adapted for solidification by cooling to yield a molded article;
- and
- means gushing a stream of gas towards both said substrate in said cavity and both of said opposed surfaces of said mold each time said metal mold is opened, said gushing means supplying a stream of gas adequate to simultaneously aid cooling of said substance and remove dew and oily matter from said at least one mold surface by impingement of said gas;
- said stream gushing means is adapted to additionally gush said stream towards said gate adequately to cool and solidify a portion of said substance facing said gate, thereby clogging said gate.
2 more elements
Dependencies are inferred from the claim text.