System and method for making sheets, films, and objects directly from polymerization processes
A system for making sheets, films, and objects including a reactor-dryer for reacting at least one monomer to produce a polymer melt; a flash melter in communication with the reactor-dryer for heating the polymer melt received from the reactor-dryer; a flash tank in communication with the flash melter for removing volatile compounds from the polymer melt; and a control loop in communication with the flash tank for controlling the pressure of the polymer melt from the flash tank to a die forming unit. Methods of making sheets, films, and objects is further included.
1. A system for making sheets, films, and objects comprising:
a reactor-dryer for reacting at least one monomer to produce a polymer melt;
a flash melter in communication with the reactor-dryer for heating the polymer melt received from the reactor-dryer;
a flash tank in communication with the flash melter for removing volatile compounds from the polymer melt; and
a control loop in communication with the flash tank for controlling the pressure of the polymer melt from the flash tank to a die forming unit, wherein the control loop includes a first, second, and third pump and a distribution manifold, the die forming unit includes a first and second die, the first pump located after the flash tank but before a distribution manifold, the second pump located between the distribution manifold and the first die, the third pump located between the distribution manifold and the second die, and the first die and second pump and the second die and third pump are separate legs of the system interconnected with the manifold, wherein the first, second, and third pump function in unison to control the pressure in the control loop, the first pump maintains the pressure into the manifold, and the first pump is responsive to the pressure at the second and third pumps and increases the pressure if the pressure drops in the second pump.
2. The system for making sheets, films, and objects of claim 1 , further comprising;
a pre-mix vessel in communication with the reactor-dryer for receiving at least one of the group consisting of monomers, co-monomers, catalysts, and solvents and delivering them to the reactor-dryer.
3. The system for making sheets, films, and objects of claim 1 , further comprising:
at least one polymer gear pump located between the flash melter and the flash tank for controlling the mass flow of the polymer melt to the flash tank.
4. The system for making sheets, films, and objects of claim 1 , further comprising:
at least one polymer gear pump located between the flash tank and the control loop for controlling the mass flow of the polymer melt to the control loop.
5. The system for making sheets, films, and objects of claim 1 , further comprising:
at least one additive unit located between the flash melter and the flash tank for adding an additive to the polymer melt prior to polymer melt entering the flash tank.
6. The system for making sheets, films, and objects of claim 1 , further comprising:
at least one source of a co-extruded polymer located prior to the die forming unit.
7. The system of claim 2 wherein the control loop is configured to control the pressure to within +/−1 bar.
8. The system of claim 2 wherein the control loop is configured to maintain the pressure entering the die at a uniform set pressure.
9. The system of claim 2 wherein the control loop is configured to reduce a pressure spike.
10. The system of claim 1 , wherein the second pump independently controls the pressure and flow to the first die and the third pump independently controls the pressure and flow to the second die.