Film forming machine

Abstract

To provide an apparatus for molding a film capable of reducing the adjusting time.SOLUTION: An apparatus for molding a film comprises: a die for extruding a molten resin from a discharge port; a plurality of die lip actuators disposed along an extending direction of the discharge port, each of which is to adjust a width of a corresponding position of the discharge port; a width identification unit for identifying a width of the discharge port; and a controller for controlling the plurality of die lip actuators on the basis of the width of the discharge port identified by the width identification unit prior to the molding.SELECTED DRAWING: Figure 5

Claims

[Claim 1] A die including a lip portion that defines the discharge port, which extrudes molten resin from the discharge port, A plurality of die lip actuators are arranged along the extending direction of the discharge port, and each adjusts the width of the corresponding position of the discharge port by displacing the lip portion; A width-determining unit for determining the width of the discharge port, A control unit that controls the plurality of die lip actuators based on the width of the discharge port, which is determined before molding by the width-specific unit, Equipped with, The control unit is a film molding apparatus that, when the film thickness at a certain circumferential position detected during molding is thinner than an allowable range, and the width of the discharge port at that circumferential position is wider than a predetermined reference width, controls the die lip actuator during molding to displace the lip portion so as to narrow the width of the discharge port. [Claim 2] A displacement amount determination unit for determining the amount of displacement of the lip portion, The control unit further comprises a determination unit that determines a target displacement amount, which is the target amount of displacement of the lip portion at each circumferential position when the control unit displaces the lip portion, The film forming apparatus according to claim 1, wherein when the control unit displaces the lip portion, it provides feedback control to the die lip actuator so that the amount of displacement specified by the displacement amount specification unit approaches the target amount of displacement determined by the determination unit, thereby displacing the lip portion at each position in the circumferential direction. [Claim 3] A displacement amount determination unit for determining the amount of displacement of the rod of the die lip actuator that displaces the lip portion, The control unit further comprises a determination unit that determines a target displacement amount, which is the target amount of displacement of the lip portion at each circumferential position when the control unit displaces the lip portion, The film forming apparatus according to claim 1, wherein when the control unit displaces the lip portion, it provides feedback control to the die lip actuator so that the amount of displacement specified by the displacement amount specification unit approaches the target amount of displacement determined by the determination unit, thereby displacing the lip portion at each position in the circumferential direction.

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