초록 ▼

An injection mold for producing a plastic injection molding having a layer of plastic molding material on the front of a metallic support. The injection mold has a first mold half over the front of the support with a mold cavity therein for holding the injected plastic material which forms the layer

An injection mold for producing a plastic injection molding having a layer of plastic molding material on the front of a metallic support. The injection mold has a first mold half over the front of the support with a mold cavity therein for holding the injected plastic material which forms the layer on the front of the support. The injection mold has a second mold half at the rear of the support with another recess for being filled with pressure fluid for pressing the front of the support against the first mold half, which seals the cavity for the injected plastic molding material to prevent leakage and to keep the line of the plastic material layer around the mold cavity on the support sharp. The pressure fluid may be supplied to the rear of the support before the molding composition is injected into the cavity at the front of the support. The pressure fluid at the rear of the support may be the same material that is applied on the front of the support. The recess in the second mold half at the rear of the support is adjacent but alongside the cavity defined in the first mold half above the front of the support, and their adjacent edges are either directly one above the other or each slightly overlaps the other recess.

대표청구항 ▼

A method of manufacturing a plastic injection molding comprising: inserting a support, having a front side and a rear side, into a mold cavity of an injection mold; injection a plastic injection molding composition with high pressure into the mold cavity for forming a layer of the plastic material o

A method of manufacturing a plastic injection molding comprising: inserting a support, having a front side and a rear side, into a mold cavity of an injection mold; injection a plastic injection molding composition with high pressure into the mold cavity for forming a layer of the plastic material on at least the front side of the support; but not on a region of the front side which is free of the plastic material; and during the injecting of the composition, supplying pressure fluid against the rear side of the support, generally to the rear of the plastic material-free region of the front side, for urging the plastic material-free region against the mold part thereover for preventing the plastic material composition from flowing onto the plastic material-free region. A plastic injection molding machine comprising: an injection mold including a top mold part and a bottom mold part between which a support for plastic injection molding composition can be positioned and held; the top mold part, which is for being over the front of the support, having a first support region which supports the front of the support; a first recess formed in the first support region and defining a mold cavity over the front of the support for receiving injected plastic injection molding composition under high pressure and the composition being for applying a layer of plastic material to the front side of the support in the mold; the bottom mold part, which is for being over the rear of the support, having a second support region which supports the rear of the support; a second recess formed in the second support region for being filled with a pressurizing fluid that acts against the rear of the support and presses the support against the first support region of the upper mold part; the second recess laterally generally adjoins the first recess; with the proviso that the top mold part support region has a sealing section that is shaped for contacting the front of the support and, as a result of such contact, for defining a region contacted by substantially all of said sealing section from which coating composition can be excluded.