System and method for adjusting the land channel length of an extrusion die

Abstract

The invention provides a system and method for adjusting the length of a channel of a flat portion in an extrusion die. The extrusion die having an adjustable flat channel can be formed from a mold body including a first mold body portion and a second mold body portion, a first lip body, a second lip body, and a flat channel body. The extrusion die can have a flow channel that includes a flat portion channel terminating in the exit aperture. The flow channel may be defined on one side by a first mold body portion, a flat portion channel body and a first lip body. The flow channel may be defined on the opposite side by the second mold body portion and the second lip body. In some examples, the length of the channel of the flat portion may be adjusted by configuring the planar channel body and / or the first lip body to move across the width of the flow channel.

Description

technical field

[0001] The present disclosure relates to extrusion dies, and more particularly, to systems and methods for adjusting the length of a flat channel on an extrusion die. Background technique

[0002] Extrusion dies are used to extrude molten thermoplastic material into relatively thin films or sheets. Conventional extrusion dies have a die cavity with the general shape of a coat hanger. These extrusion dies have been commonly referred to as hanger dies. A typical hanger mold includes an inlet, an inlet manifold, a generally triangular shaped pre-flat channel, a final flat channel and a mold outlet or gap. In operation, molten polymer flows through the extrusion die from the inlet to the die outlet. The size and shape of the various channels are selected to promote uniform polymer flow across the surface of the mold and produce a thin sheet or film of desired thickness.

[0003] In practice, panel manufacturers are often required to produce panels of differen...

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