Abstract: A T-shaped film extrusion die for use in extrusion forming a film of a synthetic resin, has a manifold, a slot-like land, lips, inner deckles and inner deckle rods. Heat pipes are provided or disposed on both sides of the manifold so as to extend in parallel with each other in the lengthwise direction of the T-shaped die, and at least a part of the outer side surface of each of the heat pipes is exposed to the interior of the manifold over the entire length of the manifold.

Abstract: A T-shaped film extrusion die having a T-shaped die main body, a device for detecting the thickness of a resin film formed by extrusion to generate a detection signal, a device for generating a correction signal on the basis of a difference between the detection signal and preset thickness data, and a lip-width adjusting device for driving lip-width adjusting bolts on the basis of the correction signal to adjust the width between lips of the die so that the resin film has a preset thickness.

Abstract: A T-shaped extrusion die for extruding films ofthermally flowable synthetic resin, comprising a manifold, a slot-like passage, lips, inner deckles for varying the edge thickness and width of the resulting extruded film and inner deckle rods for regulating the width thereof, the extrusion die characterized in that the inner deckles are each divided into upper and lower inner deckle portions for conveniently varying the width of the resulting extruded film and the inner rods are each provided at its tip with a tongue shaped protrusion for regulating the width of the resulting extruded film without forming edge beads at both edges thereof.

Abstract: A T-shaped extrusion die for forming transparent, uniformly thick and edge beads-free synthetic resins with a high efficiency, comprising a die body having a manifold for containing a supply of the synthetic resin in molten state and a slot-like passage for the molten resin, adjustable lips for forming a slot-like discharge orifice, inner deckles useful mainly for varying the edge thickness of the resulting extruded film, support rods for supporting the inner deckles, and inner deckle rods for regulating the width of the resulting extruded film, the inner deckles being moved by moving the support rods in the manifold in sliding contact with the surface thereof to vary the edge thickness of the resulting film, the inner deckle and inner deckle rod being kept somewhat away from each other thereby to permit free movement of the latter even under a high molten resin pressure. In one embodiment, a remover for an oxidized or scorched resin is disclosed.