A method and device for adjusting the concentricity of a die component of an extrusion assembly relative to a tip component in a manner that minimizes time and effort. The concentricity adjusting extrusion device includes an extrusion die body assembly including a die subassembly and a body, a die tip module and an adjustment sleeve subassembly; wherein said adjustment sleeve subassembly adjusts the concentricity of the die subassembly relative to the die tip module.

A method and device for adjusting the concentricity of a die component of an extrusion assembly relative to a tip component in a manner that minimizes time and effort. The concentricity adjusting extrusion device includes an extrusion die body assembly including a die subassembly and a body, a die tip module and an adjustment sleeve subassembly; wherein said adjustment sleeve subassembly adjusts the concentricity of the die subassembly relative to the die tip module.

There is described a method and system for regulating an extrusion process by obtaining a first thickness at a first position along an extrudate as material is extruded through a die gap of a die; comparing the first thickness with an expected thickness of the extrudate at the first position to obtain a value for an error, the expected thickness modeled in real-time using a size of the die gap as input; and varying the size of the die gap when the error exceeds a threshold to compensate for the error. There is also described a method and system for determining an expected thickness of a material during an extrusion process.

An extruder having an extruder crosshead, a die, and a die retaining assembly. The extruder crosshead has an annular major surface while the die has a first die surface facing and conformal to that major surface. The die also has a second die surface opposed to the first die surface. The die-retaining assembly is attached to the extruder crosshead, evenly and variably pressing the second die surface with controlled pressure such that the substantially opposing first die surface is pressed into the major surface of the extruder crosshead. The die-retaining also includes movable elements which abut the die in order to move the die. The die-retaining assembly can be used to evenly reduce the pressure exerted by over the second die surface so that the position adjustment elements can be used to more easily adjust the position of the die.

An extruder having an extruder crosshead, a die, and a die retaining assembly. The extruder crosshead has an annular major surface while the die has a first die surface facing and conformal to that major surface. The die also has a second die surface opposed to the first die surface. The die-retaining assembly is attached to the extruder crosshead, evenly and variably pressing the second die surface with controlled pressure such that the substantially opposing first die surface is pressed into the major surface of the extruder crosshead. The die-retaining also includes movable elements which abut the die in order to move the die. The die-retaining assembly can be used to evenly reduce the pressure exerted by over the second die surface so that the position adjustment elements can be used to more easily adjust the position of the die.

A parison separation device (30) according to an embodiment includes a cutter (31) with a cutting edge (35), the cutting edge (35) extending in a one direction and facing upward, and a block (33), the cutter being attached to an upper part of the block (33), inclined surfaces (37) being formed on both sides of the block (33) in a thickness direction of the cutting edge (35), each of the inclined surfaces (37) including a component that is inclined increasingly downward as it gets closer to one direction side end, in which the parison separation device (30) is disposed on a discharging direction side of a discharging port of a parison and configured to cut the parison discharged from the discharging port.

A film forming apparatus includes a die device which extrudes a molten resin in a tube shape to form a film and a controller which controls the die device. The die device includes an inner peripheral member which defines an inner periphery of an annular discharge port, an outer peripheral member which surrounds the inner peripheral member and defines an outer periphery of the discharge port, and an adjustment portion which applies a load to at least one of the inner peripheral member and the outer peripheral member to elastically deform the at least one of the inner peripheral member and the outer peripheral member and change a radial width of the discharge port. The controller controls a thickness of the film with the load applied by the adjustment portion.

A film forming apparatus includes a die device which extrudes a molten resin in a tube shape to form a film and a controller which controls the die device. The die device includes an inner peripheral member which defines an inner periphery of an annular discharge port, an outer peripheral member which surrounds the inner peripheral member and defines an outer periphery of the discharge port, and an adjustment portion which applies a load to at least one of the inner peripheral member and the outer peripheral member to elastically deform the at least one of the inner peripheral member and the outer peripheral member and change a radial width of the discharge port. The controller controls a thickness of the film with the load applied by the adjustment portion.

An extrusion device includes a material inlet; a material outlet; a material guidance system; a body, which passes through the material outlet and a cross-sectional area through which the extrusion material is expelled from the material outlet changes; a drive device; a cooling line system for guiding coolant. A first part of the cooling line system is suitable for guiding the coolant along the axis, a second part is suitable for guiding the coolant out of the body and around the drive device, and a third part of the cooling line system guiding the coolant outwardly, into a discharge line for the coolant at an incline to the axis. The second part of the cooling line system adjoins the first part of the cooling line system, and the third part adjoins the second part against a flow direction of the extrusion material from the material inlet to the material outlet.

An extrusion device includes a material inlet; a material outlet; a material guidance system; a body, which passes through the material outlet and a cross-sectional area through which the extrusion material is expelled from the material outlet changes; a drive device; a cooling line system for guiding coolant. A first part of the cooling line system is suitable for guiding the coolant along the axis, a second part is suitable for guiding the coolant out of the body and around the drive device, and a third part of the cooling line system guiding the coolant outwardly, into a discharge line for the coolant at an incline to the axis. The second part of the cooling line system adjoins the first part of the cooling line system, and the third part adjoins the second part against a flow direction of the extrusion material from the material inlet to the material outlet.