Solution casting process

Details Solution casting process Solution casting process

2006-08-11

2011-12-06

Johnson, Christina (Department: 1742)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

By casting liquids on a solid supporting or shaping surface

C264S216000, C264S331140

Reexamination Certificate

active

08070999

ABSTRACT:
A static and closed solution casting process comprises the following steps: dissolve a solute in a solvent to prepare a casting solution; place membrane-casting plate on bracket, and adjust the bracket to make the membrane-casting plate horizontal; pour the casting solution into membrane-casting plate such that the casting solution is uniformly spread out in the membrane-casting plate; arrange heating arrangement over the membrane-casting plate; arrange cooling side plate around the membrane-casting plate; arrange cooling bottom plate below the membrane-casting plate; supply cooling liquor to the connected interlayer of the cooling side plate and the cooling bottom plate; enclose the membrane-casting plate, the bracket, the heating arrangement, the cooling side plate and the cooling bottom plate inside an insulated case made by heat insulator; heat the casting solution in the membrane-casting plate by driving the heating arrangement to totally evaporate the solvent in the casting solution; and then continuously heat in order to enhance the crystallinity of the final membrane; stop heating; and remove the condensed solvent from the cooling bottom plate and peel the final membrane from the membrane-casting plate. This process is of simple technique, cheap equipment and low cost of membrane preparation, and the final membrane has the advantages such as high crystallinity and isotropic etc.

REFERENCES:
patent: 4248913 (1981-02-01), Jakabhazy et al.
patent: 5417832 (1995-05-01), Pellegrino et al.
patent: 5746917 (1998-05-01), Altmeier
patent: 2002/0135087 (2002-09-01), Yapel et al.
patent: 1330425 (2002-01-01), None
patent: 2602917 (2004-02-01), None
patent: 2602917 (2004-02-01), None
International Search Report of PCT/CN2006/002033, dated Apr. 26, 2007.

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