Abstract A method of drawing and heat treating undrawn filaments of condensation polymer between a heated feed roller rotating at a constant peripheral speed and a draw roller rotating a constant peripheral speed greater than that of the former, the surface of said feed roller being heated at a temperature within the range of from the second order transition point of said filaments to a temperature 55* C. higher than the second order transition point, characterized in that, A. A PRESSURE ROLLER IS PROVIDED WHICH ROTATES BY CONTACTING WITH THE AFORESAID HEATED FEED ROLLER AND PRESSES AGAINST AT LEAST THE FINAL TURN OF THE FILAMENT WOUND AROUND THE HEATED FEED ROLLER TO THEREBY FIX THE NECKING POINT AT THE POINT OF CONTACT OF THE TWO ROLLERS; AND B. A SLIT HEATER HAVING A GROOVE WIDTH OF 0.5-3.0 MM IS DISPOSED BETWEEN THE HEATED FEED ROLLER AND THE DRAWING ROLLER, THE TEMPERATURE (Y* C.) of the slit heater and treating time (x sec.) being so chosen as to satisfy the following conditions: y > OR = -1770.8 x + 255, 100 < OR = y < OR = 400, and 0.01 < OR = x < OR = 0.12.
Inventors
👤 Takaaki Fukushima
👤 Haruki Takizawa
👤 Kikuo Hori
👤 Yoshito Sato
👤 Haruhiki Mizumori
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-05 00:13
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D02J1/224
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
36 words
The method of claim 1 wherein the time (t sec) of contact of said filaments with said heated feed roller is 0.120 (T-Tg) + 28.420 > or = t > or = -0.003 (T-Tg) + 0.189
Claim 2
Dependent Claim
136 words
The method of claim 1 wherein said pressure roller has a surface of elastic material and is so disposed in contact with the periphery of said heated feed roller that its point of contact with said feed roller is positioned within a range of an angle Alpha , said angle Alpha being formed by a radius connecting said point of contact with the axial center of the heated feed roller and a radius connecting said axial center with the point at which the filaments depart from said heated feed roller when a pressure roller is not used, said angle Alpha not exceeding 20*, whereby said pressure roller presses the filaments in such a manner that at least the last wrap of said filaments wrapped around said heated feed roller is pressed against said heated feed roller.
Claim 3
Dependent Claim
65 words
The method of claim 1 wherein said undrawn filaments are imparted a pretension prior to their entry to said heated feed roller, said pretension being within the range of 10 to 90 percent of the tension at which the neck occurs as shown by a stress-strain curve of said undrawn filament measured at a temperature of 20* C. and a relative humidity of 65 percent.
Claim 4
Dependent Claim
35 words
The method of claim 1 wherein said undrawn filaments of condensation polymers are undrawn polyester filaments containing above 80 mol percent of ethylene terephthalate units, the monofilament denier of said filaments being below 150 denier.