초록 ▼

Apparatus of injection molding three-layer moldings, especially bottle blanks with an inner and an outer layer of polyethylene terephthalate and a middle layer of recycled polyethylene terephthalate, employing a mold with several cavities. The material (component A) for the inner and outer layers is

Apparatus of injection molding three-layer moldings, especially bottle blanks with an inner and an outer layer of polyethylene terephthalate and a middle layer of recycled polyethylene terephthalate, employing a mold with several cavities. The material (component A) for the inner and outer layers is supplied through one molten-component conveying channel and the material (component B) for the middle layer through another molten-component conveying channel. The channels are separately heated and their temperatures independently regulated. The melt for component A flows the same distance as the melt for component B. The melts flow into the injection-molding dies such as to ensure a uniform front.

대표청구항 ▼

[ We claim:] [1.] Apparatus for injection molding of three-layer moldings, in form bottle blanks with an inner layer and an outer layer of polyethylene terephthalate and a middle layer of recycled polyethylene terephthalate, comprising: a mold with a plurality of cavities; a first molten-component c

[ We claim:] [1.] Apparatus for injection molding of three-layer moldings, in form bottle blanks with an inner layer and an outer layer of polyethylene terephthalate and a middle layer of recycled polyethylene terephthalate, comprising: a mold with a plurality of cavities; a first molten-component conveying channel for supplying said inner and outer layers with a first material; a second molten-component conveying channel for supplying said middle layer with a second material; means for heating said first and second channels separately and regulating their temperatures independently; said first material in melted form and said second material in melted form flowing through equal distances in said first and second conveying channels; injection molding dies receiving said first material in melted form an said second material in melted form, said first material in melted form and said second material in melted form flowing uniformly into said injection molding dies; a plasticizer in each said channel for plasticizing said first material and said second material; a first block part with individual heater accommodating said first conveying channel, and a second block part with individual heater accommodating said second conveying channel, said first block part and said second block part being mutually insulated; hot-runner blocks conveying said first material and said second material to said first block part and said second block part; said first material and said second material flowing from their respective plasticizers in said conveying channels to said dies through said hot-runner blocks and said block parts connected to said dies; a stopper in said injection molding dies and having translation and rotation motions; a first contour on said stopper for controlling said motions; a second contour in said injection molding dies and operating in conjunction with said first contour; said stopper having a pin at a front side of said stopper for controlling flows of said first material and said second material into said dies.