Method for producing terylene fiber using polyester waste

Abstract

A method for producing terylene fiber using polyester waste is disclosed. Firstly, dried polyester waste is sent into a screw extruder, then is melt and extruded to be polyester melt. Whereafter, the melt is filtrated twice to remove impurities. Then macromolecule polymerization reaction is taken place in the polyester melt to homogenize the molecular weight of macromoleclar polymer and to increase the viscosity of the polyester. Then the melt with increased viscosity is finely filtrated using melt precision filter. Whereafter, the melt is sent into a spinning box to execute metering spinning, then is cooled and solidified to be filaments. Finally, the filaments are wound according to various process requirements. The method can increase the quality of regenerated polyester spinning melt. The regenerated polyester melt has less impurities and homogenous viscosity after multiple filtrating. The fiber product has advantages of less end breakage rate, high full-bobbin rate, high finished product rate and less wastage.

What is claimed is: 
     
         1 . A method for producing terylene fiber using polyester waste is achieved by a nozzle assembled to a bottle, the nozzle comprising:
 a press cover, a revolving cover, and a cylinder to construct the appearance of the nozzle;   the press cover having a first tube extending therefrom, a first channel defined in the first tube for melting substances or liquid to flow through;   the revolving cover being screwed on an opening of the bottle for sealing the bottle;   the cylinder having an upper chamber and a lower chamber, the upper chamber abutting against the inner wall of the opening of the bottle;   a first melt precision filter, a spinning box, a connecting tube, a first piston, a spring, a second piston, a needle valve and an unidirectional valve being assembled into the nozzle;   the first melt precision filer having a second tube defined therethrough, a first filtrated mesh being set on the bottom of the second tube, a net being set on the top of the second tube;   the spinning box formed by a fourth tube, an annular fringe extended from the fourth tube and around the fourth tube, a second filtrated mesh being set on the top of the fourth tube, the bottom of the fourth tube being opened for the melting substances or liquid to flow into, the annular fringe having an annular groove defined therein; when the press cover is pressed down, the bottom of the first tube is abutted against the annular fringe;   the top of the connecting tube extending into the spinning box, the connecting tube having a second channel, the second channel communicating with the first channel of the press cover, a sealing member assembled between the spinning box and the connecting tube, the sealing member formed by a seventh tube, a sealing fringe extruded along the bottom periphery of the seventh tube, a plurality of ribs radially formed on the outer periphery of the seventh tube, a plurality of air paths defined between each of two neighbor ribs, the sealing fringe having a taper portion formed thereon;   the first piston assembled into the upper chamber of the cylinder, the first piston comprising a first inner tube, a first outer tube, a first connecting portion formed between the first inner tube and the first outer tube for integrating the first piston, the first inner tube surrounding the middle of the connecting tube, an up-sealing groove defined on the top of the first connecting portion of the first piston, a plurality of air holes defined between the up-sealing groove and the first inner tube; when the spinning box is assembled to the first piston, the annular groove of the spinning box is received in the up-sealing groove of the first piston and sealing with each other; a taper recess defined on the bottom periphery of the first inner tube; when the sealing member is assembled to the first piston, the taper portion is engaged with the taper recess for sealing;   the second piston assembled into the lower chamber of the cylinder, the second piston comprising a second inner tube, a second outer tube, a second connecting portion formed between the second inner tube and the second outer tube for integrating the second piston, a tapered section defined on the bottom periphery of the second inner tube of the second piston; when the connecting tube is moving downward, the bottom of the connecting tube is abutted against the second connecting portion of the second piston;   one end of the spring abutted against the sealing member, another end of the spring abutted against the lower chamber of the cylinder;   the needle valve formed by a rod, the rod having a disk at the bottom, a sealing section extended from the disk and surrounding the bottom of the rod; when the needle valve is upwardly passing through the second inner tube of the second piston and entering into the second channel of the connecting tube, the top of the needle valve is received in a necking portion and positioned by the necking portion; a fluid channel formed between the needle valve and the second inner tube of the second piston for the melting substances or liquid to flow into, the tapered section of the second piston engaged with the sealing section of the needle valve for sealing; and   the unidirectional valve placed in the lower chamber of the cylinder and near an entrance of the cylinder.   
     
     
         2 . The nozzle as claimed in  claim 1 , wherein the first filtrated mesh and the second filtrated mesh both have a top layer and a bottom layer, a plurality of diamond holes alternately defined on the top layer and bottom layer, a middle space formed between the top layer and the bottom layer, the diamond holes on the top layer and bottom layer communicated with the middle space. 
     
     
         3 . The nozzle as claimed in  claim 1 , wherein the first tube has two rectangular edges defined in the left and right sides of the inner wall of the first tube, two cutting edges respectively defined at the left and right sides of the outer periphery of the second tube of the first melt precision filter, the cutting edges engaged with the rectangular edges for stably connecting the first melt precision filter into the first tube of the press cover, a curved recess defined on the outer periphery of the fourth tube of the spinning box, the spinning box positioned in the first tube by an engagement between the rectangular edge and the curved recess. 
     
     
         4 . The nozzle as claimed in  claim 1 , wherein a plurality of fourth teeth is formed on the bottom peripheral of the fourth tube, a plurality of fourth gaps defined between each of two neighbor fourth teeth, the fourth tube having a plurality of fourth ribs formed on the inner wall of the fourth tube, a plurality of air channel defined between each of two neighbor fourth ribs. 
     
     
         5 . The nozzle as claimed in  claim 1 , wherein the top of the connecting tube has an enlarging portion, a plurality of sixth teeth formed on the top periphery of the enlarging portion, a plurality of sixth gaps defined between each of two neighbor sixth teeth, the spinning box communicated with the second channel of the connecting tube via the sixth gaps. 
     
     
         6 . The nozzle as claimed in  claim 1 , wherein the middle of the second channel is necked to form the necking portion, the top of the needle valve received in the necking portion and positioned by the necking portion, a plurality of protrusions axially formed on the periphery of the rod, a plurality of unfilled space defined between each of two neighbor protrusions. 
     
     
         7 . The nozzle as claimed in  claim 1 , wherein an annular recess is defined at the bottom of the sealing fringe of the sealing member, one end of the spring fixing in the annular recess of the sealing member. 
     
     
         8 . The nozzle as claimed in  claim 1 , wherein the lower chamber has a spring room for receiving the spring, the lower chamber and the upper chamber separated by the second piston, another end of the spring receiving into the spring room of the cylinder. 
     
     
         9 . The nozzle as claimed in  claim 1 , wherein the upper chamber has a vent defined thereon, the first piston assembled into the upper chamber of the cylinder and near the vent, the inner space of the cylinder isolated by the first piston. 
     
     
         10 . The nozzle as claimed in  claim 1 , wherein an annular pad is assembled between the top of the upper chamber of the cylinder and the opening of the bottle for further sealing the bottle.