Die lip opening/closing device

A resin feeder comprising an extruder, an accumulator, and a T-die, wherein

• the T-die comprises a die lip and a die lip opening/closing device comprising:
• an opening/closing structure configured to open and close a die lip of a T-die in response to a linear motion of a pusher;
• and
• an actuator configured to actuate the pusher to move linearly,
• wherein the pusher comprises a plurality of sub-pushers disposed along a longitudinal direction of the die lip, and
• the actuator is provided for each of the sub-pushers, wherein
• the accumulator is configured to be filled with resin melted and kneaded in the extruder,
• the T-die is configured to be filled with the resin filling the accumulator,
• and configured that during the filling of the T-die with molten resin, the die lip is closed,
• and configured that when the T-die is sufficiently filled with the molten resin required for molding, the die lip opening/closing device is configured to open the die lip, and a molten resin sheet is extruded through a slit of the die lip, wherein
• each of the sub-pushers is provided with a pusher-bar,
• a pusher head is provided at an end portion of the pusher bar,
• the opening/closing structure comprises a receiving piece and a die lip piece,
• the die lip piece comprises a bending portion formed into a thin wall with a block cut out, a receiving piece connection to which the receiving piece is attached, and a fixing portion fixed to a body of the T-die,
• the receiving piece connection and the fixing portion are connected by the bending portion, and
• the pusher head is configured to press the receiving piece connection through the receiving piece.