Patent ID: 6604848
Filing Date: 2003-08-12
Classification: B29C,B29K,C08G

Abstract:
A continuous mixing apparatus for mixing a polyester resin continuously, comprising:a chamber (4) having a material feed port (2) and a material discharge port (3); a mixing rotor (5) inserted into said chamber rotatably; a plurality of vent openings (7) connected to vacuum pumps for reducing the internal pressure of said chamber; a material feed means (6) connected to said material feed port; a chemical agent feed means (10) connected to said chamber (4) and adapted to feed into the chamber a chemical agent which is for increasing the viscosity of a feed resin or for suppressing a lowering in viscosity of the feed resin; a drying section (14) located in said chamber on an upstream side of said chemical agent feed means, wherein at least one of said vent openings is connected to said drying section; a thickening section (15) located in said chamber on a downstream side of the chemical agent feed means, wherein at least one of said vent openings is connected to said thickening section; at least one first resin filling means located in said chamber upstream of said chemical agent feed means and downstream of the vent opening connected to the drying section; and at least one second resin filling means located in said chamber downstream of said chemical agent feed means and upstream of the vent opening connected to the thickening section; wherein in said drying section the feed resin, before the addition of said chemical agent thereto, is subjected to mixing while being dehydrated under reduced pressure, and in said thickening section the feed resin, after the addition of the chemical agent thereto, is subjected to mixing while being deaerated under reduced pressure, and wherein said apparatus does not have a chemical agent feed means upstream of said drying section.