摘要:
A T-shaped film extrusion die (1) for use in extrusion forming a film of a synthetic resin, comprising a manifold (2), a slot-like land (3), lips (4), inner deckles (5) and inner deckle rods (6), characterized in that heat pipes (7) are provided or disposed on both sides of said manifold (2) so as to extend in parallel with each other in the lengthwise direction of said T-shaped die (1), and at least a part of the outer side surface of each of said heat pipes is exposed to the interior of said manifold (2) over the whole length thereof.
摘要:
An improved apparatus providing for uniformity of web thickness. In one aspect, the apparatus includes a plurality of gap-controlling, thermal energy sources (44), and in heat-exchange communication with the thermal energy sources, an assembly (70) for compensating for temperature variation proximate to the thermal energy sources and across the apparatus width. The thermal compensating assembly includes a heat exchange jacket (72), and in combination therewith, a heat-exchanging, working fluid that undergoes a phase change in performing its heat exchange function. In another aspect of the invention, the apparatus includes an element (100) disposed along an exit slot-forming lip (18'), that reduces localized thermal gradients along the lip. This element functions as a heat sink and a heat source proximate to the lip gap, and likewise includes a heat-exchanging, working fluid that undergoes a phase change.
摘要:
Bei einer Vorrichtung zum Extrudieren von thermoplastifizierten Kunststoffen durch eine Schlitzdüse (12), insbesondere eine Breitschlitzdüse, deren Düsenspalt (16) von zwei Flankenflächen eines Düsenkörpers (14) bestimmt ist, deren eine als flexible Lippe (18) ausgebildet sowie mit einem quer zum Düsenspalt verlaufenden Hebelarm (26) versehen ist, sind an die flexible Lippe mehrere Hebelarme angeformt, und jeder Hebelarm ist zur Veränderung der Spaltweite (e) des Düsenspaltes um eine zum Düsenspalt parallel gedachte Drehachse (M) durch eine ihn durchsetzende Stellschraube od.dgl. mechanisch ausgebildete Verstelleinrichtung (28) begrenzt führbar. Zudem soll das Schraubenende der den Hebelarm durchsetzenden Verstelleinrichtung drehbar in einem Einsatz (29) des Düsenkörpers lagern und die Verstelleinrichtung mit einem radialen Mitnehmer (30) versehen sein, der mit Mitnehmern weiterer Verstelleinrichtungen durch eine drehende Getriebestange od.dgl. Verbindungselement verbunden ist.
摘要:
In a heat displacing type die adapted to extrude a sheet of molten resin, a heat displacing unit (51) provided with a heater (54) is secured to an upper die block (11). A lip gap (15) is defined between a flexible lip (13) and a stationary lip (14) respectively provided for the upper and lower die blocks. The lower end of a bolt extending through the heat displacing unit (51) is normally in contact with or secured to the flexible lip (13) while the upper end is secured to the upper portion of the heat displacing unit (51). In a modified embodiment the bolt is air cooled. With this die a resin sheet having uniform thickness and smooth surface can be obtained.
摘要:
An apparatus and method for continuously producing a sheet composed of a plurality of materials co-extruded in segments along the width of the sheet are provided. The extrusion die has a slit extending along the width of the die, the slit being divided into a plurality of adjacent sections along the length of the slit. The widths of each of the segments are variable and can be accurately controlled. Feeding means for feeding material to each of the separate adjacent sections is provided. The method and apparatus are effective to produce a thermoplastic sheet having two or more layers in a central portion of the sheet and only a single layer at the edge portions of the sheet.