Abstract: A method of recovering a solvent including: supplying polymerization reactants including one or more monomers and a solvent to a reactor to obtain a polymer solution; supplying a stream including the polymer solution to a separator to separate an upper discharge stream including the solvent, wherein the solvent is in a gaseous phase, and a lower discharge stream including the polymer solution; heating a divergence stream including a part of the lower discharge stream from the separator by a heating device and refluxing the divergence stream to the separator; supplying a residue stream including a remainder of the lower discharge stream from the separator to a steam stripping process unit; and adjusting a vapor mass fraction of the divergence stream which is refluxed to the separator with a pressure adjustment valve after being heated by the heating device.

Abstract: Methods and devices for making holographic stereogram using electronic desktop printers are disclosed. A new printing medium comprising microscopic arrays of embossed holographic optical elements is provided. Methods of mass printing such stereographic images directly or indirectly are also disclosed.

Abstract: A device for printing additive color images comprising a modified desktop wire printer, a set of print wires with surface relief diffraction gratings incorporated at the tips, a steel print platen and a print substrate made of thermal plastic material, is disclosed. The striking strokes of the print wires impress a large plurality of tiny dot of diffraction gratings onto the substrate via the mechanism of micro embossing to form the image. Color differentiation is accomplished by varying the pitches of the diffraction gratings in the dots. An alternating technique of transfer printing to produce similar result is also disclosed.