| 摘要 |
<p>PURPOSE:To enable the easy forming of pen nibs having a significantly deformed diametric cross section by providing a melt speed adjusting aperture having an aperture length controlled to enable a melt passage through a melt shaping aperture at almost the same speed against the melt shaping aperture between all the melt shaping apertures of a shaping opening and the interior of a die body. CONSTITUTION:A shaping opening C of a similar form to the diametric cross section of a pen nib having a desired diametric cross section form to be molded is formed in a continuous way through a melt sump B1 and a flow control B located behind, in front of a die A. Melt speed adjusting apertures B2, B3 and B4 which exist between all the melt shaping apertures 1 and the melt sump B1 to make both these parts continuous and control the melt velocity are of the same number as melt shaping apertures 1 and are adjusted lengthwise so that the melt passage through each melt shaping aperture 1 may be controlled to the same velocity. Thus unfinished tubular pen nibs of a similar cross section to the diametric cross section form of the shaping opening C are extruded from the shaping opening C.</p> |
