US3715421A — Process for the preparation of polyethylene terep…

Claim 1

Independent Claim 302 words

Continuous process for the preparation of highly drawn polyethylene terephthalate filaments which comprises extruding molten polyethylene terephthalate through a spinnerette to form filaments, quenching the filaments, applying to the filaments a lubricating finish, passing the filaments successively over a feed roll system and a draw roll system, each system comprising at least two cylindrical rolls with each roll having a surface roughness with a roughness height as defined by ASA B 46.1 - 1962 of 0.5-2.2 microns, allowing a slipping of the filaments around the feed roll system and the draw roll system of one to five turns, driving at least one feed roll and one draw roll by a motor, arranging said systems so that the axis of the feed roll from which the filaments leave the feed roll system and the axis of the draw roll at which the filaments arrive at the draw roll system are parallel while the axes of at least two of the feed rolls of the feed roll system are skew set to each other and the axes of at least two of the draw rolls of the draw roll system are skew set to each other, gradually drawing the filaments, starting the drawing while the filaments pass around the last one to five turns before leaving the feed rolls which have a surface temperature of 75* - 130* C., and completing the drawing while the filaments pass around the first one to five turns after arrival on the draw rolls which have a surface temperature of 180* - 240* C. and a surface speed at least five times that of the feed rolls, drawing the filaments at a total draw ratio Of not less than 5.0, and finally winding up the drawn filaments at a speed of not less than 1,800 meters per minute.

Claim 2

Dependent Claim 302 words

Continuous process for the preparation of highly drawn polyethylene terephthalate filaments which comprises extruding molten polyethylene terephthalate through a spinnerette to form filaments, quenching the filaments, applying to the filaments a lubricating finish, passing the filaments successively over a feed roll system and a draw roll system, each system comprising at least two cylindrical rolls with each roll having a surface roughness with a roughness height as defined by ASA B 46.1 - 1962 of 0.5-2.2 microns, allowing a slipping of the filaments around the feed roll system and the draw roll system of one to five turns, driving at least one feed roll and one draw roll by a motor, arranging said systems so that the axis of the feed roll from which the filaments leave the feed roll system and the axis of the draw roll at which the filaments arrive at the draw roll system are parallel while the axes of at least two of the feed rolls of the feed roll system are skew set to each other and the axes of at least two of the draw rolls of the draw roll system are skew set to each other, gradually drawing the filaments, starting the drawing while the filaments pass around the last one to five turns before leaving the feed rolls which have a surface temperature of 75* - 130* C., and completing the drawing while the filaments pass around the first one to five turns after arrival on the draw rolls which have a surface temperature of 180* - 240* C. and a surface speed at least five times that of the feed rolls, drawing the filaments at a total draw ratio Of not less than 5.0, and finally winding up the drawn filaments at a speed of not less than 1,800 meters per minute.

Claim 3

Dependent Claim 23 words

Process as set forth in claim 1 including using a lubricating finish which contains not more than 10 percent by weight of water.

Claim 4

Dependent Claim 59 words

Process as set forth in claim 1, wherein the spun filaments before arriving at the feed roll system, pass over a pre-tension roll system comprising at least one unheated motor-driven roll, using a surface speed of the pre-tension unheated roll which is lower than the surface speed of the feed rolls with the speed difference not exceeding 2 percent.

Claim 5

Dependent Claim 55 words

Process as set forth in claim 1 including providing said rolls with a surface roughness range, as defined by DIN 4762, of 4.5 - 8.0 microns, a peak distance of not more than 140 microns, an average peak distance of 40 - 60 microns, and a profile curvature of not more than 0.030 microns 1.

Claim 6

Dependent Claim 21 words

Process as set forth in claim 4 including providing said rolls with an average roughness range of 1.6 - 3.0 microns.

Claim 7

Dependent Claim 21 words

Process as set forth in claim 1 including providing said rolls with a peak distance of not more than 140 microns.

Claim 8

Dependent Claim 20 words

Process in accordance with claim 6 including providing said rolls with an average peak distance of 40 - 60 microns.

Claim 9

Dependent Claim 21 words

Process in accordance with claim 1 including providing said rolls with a profile curvature of not more than 0.030 microns 1.

Claim 10

Dependent Claim 175 words

Continuous process for the preparation of highly-drawn polyethylene terephthalate filaments which comprises extruding molten polyethylene terephthalate through a spinnerette to form filaments, quenching the filaments, applying to the filaments a lubricating finish, passing the filaments over feed rolls and draw rolls which have a surface roughness which allows slipping of from one to five turns before the filaments leave the feed rolls and after the filaments arrive at the draw rolls, the feed rolls having a surface temperature of 75* - 130* C, and the draw rolls having a surface temperature of 180* - 240* C and a surface speed at least five times that of the feed rolls, partially drawing the filaments at the lower temperature of the feed rolls, continuing to draw the filaments between the feed rolls and the draw rolls, and completing the drawing of the filaments at the higher temperature of the draw rolls to attain a total draw ratio of 5 to 8, and winding up the drawn filaments at a speed of 1,800 to 6,000 meters per minute.

Claim 11

Dependent Claim 175 words

Continuous process for the preparation of highly-drawn polyethylene terephthalate filaments which comprises extruding molten polyethylene terephthalate through a spinnerette to form filaments, quenching the filaments, applying to the filaments a lubricating finish, passing the filaments over feed rolls and draw rolls which have a surface roughness which allows slipping of from one to five turns before the filaments leave the feed rolls and after the filaments arrive at the draw rolls, the feed rolls having a surface temperature of 75* - 130* C, and the draw rolls having a surface temperature of 180* - 240* C and a surface speed at least five times that of the feed rolls, partially drawing the filaments at the lower temperature of the feed rolls, continuing to draw the filaments between the feed rolls and the draw rolls, and completing the drawing of the filaments at the higher temperature of the draw rolls to attain a total draw ratio of 5 to 8, and winding up the drawn filaments at a speed of 1,800 to 6,000 meters per minute.

Claim 12

Dependent Claim 32 words

A process as set forth in claim 9 wherein the temperature of the feed rolls is 80* - 90* C, and the temperature of the draw rolls is 210* - 230* C.

Claim 13

Dependent Claim 23 words

Process as set forth in claim 9 including using a lubricating finish which contains not more than 10 percent by weight of water.

Claim 14

Dependent Claim 39 words

A process as set forth in claim 9 wherein said surface roughness consists of a coherent, non-porous, abrasion-resistant, impermeable coating of tiny, smooth-topped elevations of unequal height and irregular distribution in all directions on the surface of said rolls.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-02-06	1976-08-07	1977-02-06	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-02-06	1980-08-07	1981-02-06	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-02-06	1984-08-07	1985-02-06	$7700.00	Window Closed / Lapsed

Process for the preparation of polyethylene terephthalate filaments

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