Patent ID: 8932506
Filing Date: 2015-01-13
Classification: B29C,B29K

Abstract:
1. A method for molding resins inside a cavity formed within a mold, the method comprising: heating the mold to a temperature equal to or higher than a melting temperature of the resin before opening a plurality of paths installed so as to be openable and closable and optionally maintaining the resin inside the cavity at a pressure; injecting resins into the cavity through the plurality of paths; closing each of the plurality of paths such that the resins injected from each path converge, there being a time difference between when a first path and a second path of the plurality of paths are closed, by which the resin from the first path submerges into the resin from the second path; and cooling the mold so as to control solidification of at least the resin being injected from the earliest-closed path, wherein the resin has a crystallinity degree of 20% or more after cooling, wherein closing the paths comprises the steps of: closing the second path and solidifying the resin while the resin from the first path is maintained at pressure, and closing the first path after the temperature of the mold falls to a temperature lower than or equal to a heat distortion temperature of the resin.