| 摘要 |
<p>A film extruder employs an internal deckle system including a tapered wedge flag (48) composed of a pair of rectangular metal bars (49, 50) disposed in the pre-land area (17) of the die one above the other with the opposing edges of each bar having a tapered surface (51, 52). The tapered surfaces (51, 52) cause the bars (49, 50) to increase or decrease the total width of the flag when one of the bars is moved and to provide sufficient sealing pressure to effectively seal off the pre-land area (17). Preferably, the tapered wedge flags (48) are disposed below the usual plug (45) at each end of the extruder and apply sealing pressure against a deckle rod (65) adjustably placed below the tapered wedge bars (49, 50).</p> |
