US2090352A

US2090352A - Filament treatment

Info

Publication number: US2090352A
Application number: US638533A
Authority: US
Inventors: Herrmann Conrad
Original assignee: North American Rayon Corp
Current assignee: North American Rayon Corp
Priority date: 1931-11-05
Filing date: 1932-10-19
Publication date: 1937-08-17
Anticipated expiration: 1954-08-17

Description

- A gc. HERRMANN 2,090,352

FILAMENT TREATMENT Filed Oct 19, 1932 2 Sheets-Sheet l awe/M900 aayzfadffeffmaazdz,

C. HERRMANN F I LAMENT TREATMENT Filed Oct. 19 1932 2 Sheets-Sheet 2 Patented Aug. 17, 19 37 FEKAWNT TREATMENT.

Appilcation @ctoher 19, 1932, erial No. 638,533

In Germany November 5, 1931 V 6 (Claims.

My present invention has to do with a new and novel method for drying yarn of artificial origin so that the said yarn is not dried under undue tension.

In the usual process of manufacturing artificial yarn, the yarn is produced and wound upon spools, rollers, reels or the like. Usually after the wet-treatment steps are completed the yarn is dried. Because the spools, etc., upon which it 'is wound have unyielding centers or winding surfaces, the innermost layers of the yarn body are prevented from shrinking properly during the drying steps. This causes many disadvantages in the use of the filaments or yarn thus dryed.

Proposals have been made 'to wind the yarn upon spools with yielding or collapsible winding surfaces which decrease in size as the yarn shrinks. Further proposals concern the bolstering or padding of a spool or bobbin winding suring, but the center of the spool being rigid.

rollers, or bobbins, but whereby the filaments or yarn while still moist, or while remoistened, are passed through heated air, or other drying medium. The filaments are then wound or collected in the usual manner e. g., on spools 'or reels, in spinning pots, on twisting devices, etc.

Referring to the drawings:

Fig. 1 is a diagrammatic side elevation of one form of the apparatus used in carrying out my new method of filament treatment.

Fig. 2 is a diagrammatic side elevation of a modified form of apparatus as used with my new 40 method of filament treatment.

Fig. 3 is a diagrammatic side elevation of another modified form of apparatus which may be used with my novel method.

Fig.4 is a detail perspective view illustrating the drying chamber in use.

In carrying out my new method it is important that a uniform tension be exerted on the filaments when they are passing through the drying zone. The degree of tension should approach I zero, as nearly as practicable, that is, only the face, the padding being to a certain extent yield- (iCi. M 24) thread guide 3 and thence over a driven roller t. The filaments i then pass through a drying chamber 5 through which heated air or any other drying medium may be circulated. Nipples 6 and l are shown whereby conduits may be attached for this purpose.

After passing through the drying chamber 5 the filaments I are passed downwardly to form a loop 8 in order that the only tension exerted is the weight of the filaments per se. A thread brake 9 is disclosed for the purpose of forming this loop. The filaments I then pass through feed rollers I0-Ill to a collecting device not shown.

If it is desirableto exert any small additional positive tension, this could be accomplished by passing the filaments over a solid, easily rotatable roller immediately after it emerges from the drying zone. A freely movable roller loaded by weights may be used in conjunction with the firstnamed roller as disclosed in Fig. 2 of the drawings. In this modified form the same reference numerals as used in Fig. 1 will indicate similar parts, wherein the numeral I indicates the filaments which are led off from a reel II which revolves in a trough I2 containing the remoistening liquid. The filaments I then pass through two rods I3I3 which act to remove any excess liquid therefrom, and are then carried over the driven roller 4 after which the filaments I pass vertically downward through the drying chamber M. In this form the drying chamber I4 has' a water jacket whereby heated water or steam may be circulated in order to dry the filaments.

In order that additional tension may be placed on the filaments l, the filaments may after leaving the drying chamber I 4 be passed under an easily rotatable roller I6 having means for loading weight thereon. The filaments I may then be passed up and over another roller I l to the I feed rollers Ill-I0 and then be passed to a collecting means (not shown).

Yarn or filaments produced by a wet spinning process may be drawn fromthe cake or other' winding and/or take-up-means, and led through the drying zone by means of suitable take-up devices. The yarn may be already washed and either wholly or partially after-treated. It is preferable that no previous drying be effected, but that the filaments pass through the drying zone while still in a moistened condition. If the filaments have dried out, to a certain extent, they should be remoistened, for example, by rotating the dried package in a liquid, and the moistened filaments then drawn oiT in the manner set forth. Or, it may be advisable to subject the filament drawn over a wick 2| which is set in a liquid container 22, for the purpose of remoistening the filaments; The filaments are then carried over a driven roller 23 and pass vertically downward through the drying chamber 24.. After passing the drying zone they are then carried around a roller 25 and passed through feed rollers 26-26 to the collectory bobbin 21.

The'drawing off may be either over-head or tangential, or even downwardly. Since a surplus amount of the moistening liquid often adheres to the remoistened filament,'the excess of moisture may be removed by means of wiping devices, perhaps in the form of thread guides, squeezing rollers, and the like, in order to avoid needles 5 heat consumption. 1

Heated tubes, or tubes through which heated air passes may be used advantageously for the drying zone of the damp or remoistened single filament. The drying chamber may be so formed,

30 that several single filaments may pass therethrough side by side. The heating may be accomplished in any well-known manner.

The treating of the damp or remoistened single filament may also be repeated in a zone arranged 35 successively for the passage of the filament.

The filaments so dryed are then led to any well-known winding and/or twisting device.

These filaments, so treated, are freed from any interior tension, and show an extraordinary uniformity in their interior structure, thus doing away with the disadvantages present when ordinary methods are employed.

Having now set forth my invention as required 5 by the patent statutes, what I desire to claim is:

1. In a process for drying filaments of artificial origin, the step of passing a moist thread through a drying zone under uniform tension, the said tension being applied outside the drying zone.

2.- In a process for drying filaments of artificial origi the step of progressively passing continuous engths of moist filaments through a drying zone under uniform tension, the said tension being applied outside the drying zone.

3. In a process for drying filaments of artificial origin, the step of. progressively passing moist threads in continuous lengths through a drying zone under a uniform tension created by a mass of the thread which has passed therethrough.

4. In a process iordrying filaments of artificial origin, the step of passing continuous lengths of moist filaments through a drying zone under uniform tension, the said tension being applied outside the drying zone.

5. In a process for drying filaments of artificial origin, the step of passing a moist thread through a drying zone out of contact with any structure within the drying zone and under a uniform tension, the said tension being applied outside the drying zone.

6. In a process for drying filaments of artificial origin, the step of passing continuous'lengths of moist filaments through a drying zone out of contact with any structure within the drying zone 35 and under a uniform tension, the said tension being applied outside the dryingzone. i

CONRAD HERRMANN.