| 摘要 |
<p>PURPOSE:To save material at the time of material change and improve the parison surface condition thru the first-in and first-out method by a mechanism wherein a plunger is provided slidably between a head-body and a core, and making a hole for the passage of the material at the plunger. CONSTITUTION:Melted material flows down through a vertical hole 6 of a plunger 5 from a material feed inlet 8 and is stored into a storage chamber 7. As the material accumulates, the plunger 5 rises in such a manner that material to be loaded piles one upon another in sequence. When the material is accumulated up to a given level in the storage chamber 7, an injection cylinder 13 is stretched to push the plunger down and extrudes the material in sequence from the bottom of the chamber 7 through a nozzle 17 to form a parison 18. Such the first-in/first-out technique allows the production of molding of high quality. With the lowering of the plunger scrapes the material whenever attached to the inner surface of the material is created because of smaller sectional area of the vertical hole 6 and prevents the retention of the material. In this manner, material for the proceeding extrusion can be limited at the material change.</p> |
