| 摘要 |
<p>By this invention, novel a continuous rotary thermo-forming system of the in-line type is provided. An extruded web of thermo-plastic material passes directly from the extrusion dies to a continuous thermoforming apparatus in which vacuum means are provided for drawing the thermoplastic material into mold cavities. The apparatus and method of this invention provides such a thermo-forming system in which male assist means are provided for assisting the vacuum means to effectuate a draw of the thermo-plastic material into the mold cavities and into the peripheral mold faces. A plurality of reciprocatable assist stations cooperate with the mold cavities. This serves to enhance the detail and/or depth of draw and resulting quality of the thermo-formed articles manufactured thereby. Thus, by the present invention, pressure assist devices are synchronized with rotary molding devices such that high speeds are achievable without the sacrifice of quality.</p> |
