SLOT DIE FOR EXTRUSION DEVICE

摘要

The invention discloses a slot die (10) for an extrusion device for the extrusion of preforms (1) in web or strip form from thermoplastic material which comprises a die gap (11) extending transversely to a direction of extrusion and intended for delivering a preform (1). The slot die (10) is characterized in that it comprises at least one adjusting element (12), which is arranged peripherally in the die gap (11), limits a widthwise extent (SB) of the die gap (11) and is mounted continuously displaceably and/or pivotably with respect to the die gap (11). The widthwise extent (SB) of the die gap (11) is dynamically and continuously variable by displacing and/or pivoting the adjusting element (12), so that a widthwise extent (VB) of a preform (1) extruded from the slot die (10) is continuously and infinitely variable over the length of extrusion thereof.

主权项

1. Slot die for an extrusion device for the extrusion of preforms in web or strip form from thermoplastic material comprising a die gap extending transversely to a direction of extrusion and intended for delivering a preform, wherein
the slot die comprises at least one adjusting element, which is arranged peripherally in the die gap, limits a widthwise extent (SB) of the die gap and is mounted continuously displaceably and/or pivotably with respect to the die gap; and the widthwise extent (SB) of the die gap is dynamically and continuously variable by displacing and/or pivoting the adjusting element, so that a widthwise extent (VB) of a preform extruded from the slot die is continuously and infinitely variable over the length of extrusion thereof characterized by the following features: the adjusting element has a side edge running obliquely in relation to the die gap and directed towards the die gap; the adjusting element is displaceable parallel to the direction of extrusion (ER); by displacing the adjusting element in a first direction, the side edge is pushed into the die gap, so that the widthwise extent (SB) of the die gap is reduced; and by displacing the adjusting element in a second direction, the side edge is pushed out from the die gap, so that the widthwise extent (SB) of the die gap is increased.