US1787385A - Treating dry webs of woven material - Google Patents

Description

Dec. 30, 1930. MALY TREATING DRY WEZBS OF WOVEN MATERIAL Filed May 2. 1928 Patented Dec. 30, 1930 HERMANN IJIALY, GUBEN, GERMANY TREATING DRY WEBS OF WOVEN MATERIAL Application filed May 2, 1928, Serial No. 274,582, and in Germany May 10, 1927.

The invention relates to a method of and a machine-for moistening, chemically treating, and steaming dry webs of woven material.

.In the dry, and particularly in the hot refinement or dressing of the webs of woven material there has always been up to now the noxious result that the web becomes exceedingly dry. To compensate as far as possible this noxious condition, the'known moistening processes have been employed hitherto, which consist either in artificially moistening the air,'or leading the exceedingly dry webs along moist surfaces withouttouching the same,

1 or in sprinkling the web faces with finely atomized water, or inserting the dry webs between moistened cloths.

The two first-named processes sufier from the drawback, that afurther drying of the dry web, which is warmer than the surrounding air, takes place until a state of equalization of temperature arises between this dry and warmer web and the air. Only from this moment begins the hygroscopic action, and

this only 450 a degree corresponding to the moisture contained in the air.

The two last-named processes suffer from the well-known drawback that previous dressing effects, as e. g. pressing effects, are destroyed by them, and that these processes therefore can be employed only within narrow limits.

Now my present invention relates on the one hand to a process for moistening, by a simultaneous capillary and hygroscopic action, exceedingly and normally dry webs, to such an extent, that the subsequent dressing process up to the hot-pressing just consumes the moisture contained in the web, and, on the other hand, to a method and apparatus for applying Water or chemical agents to exceedingly or normally dry webs, with slmultaneous capillary, hygroscopic, and osmotic action, without moistening the web to such an extent, that a special subsequent drying operation is required.

To carry out my new process, I employ a machine as illustrated in the drawing, that accompanies and forms part of this speclfi- 50 cation.

The figure shows a front view of the machine.

The machine illustrated possesses two rollers 'w w that alternately act as magazine and receiving rollers. The rollers '20 and w are driven respectively by drive shafts b and 6 First the wrapping cloth Z is wound on roller 10 from roller 4,0 and then it is wound on roller 10 from roller 'w The rollers Q01, 10 are designed as perforated metallic hollow rollers. The wrapping cloth Z receives its driving motion from a pair of pressure rollers (Z d The motion of the wrapping cloth is constant; that of the winding rollers w 10 is accomplished by a leading friction drive. Besides imparting motion, the pair of pressure rollers 6Z1, (Z serves at the same time to evenly distribute the moisture taken up by the wrapping cloth. The degree of moisture of the wrapping cloth may be regulated by varying the speed of rotation of the moistening roller a.

' The machine is further provided with a suction or pressure pump 79, which is connected through pipes 0 c with the perforated hollow rollers e0 w. The latter may also be connected to a steam supply.

The process the described machine is intended for, takes place in the following manner:

The dry webs m, y are Wrapped into the wrapping cloth Z that is moistened with water or a suitable solution. During or after the wrapping procedure the air pump 29 is started. An equalization of the moisture contained in excess in the wrapping cloth Z then takes .place between the latter and the dry webs as,

y. This equalization takes place both through capillary action, as the two dry surfaces of each of the webs :0, y are in close contact with the moist surfaces of the wrapping cloth Z, and through hygroscopic action, as the air current set up by the air pump 32 as suction or pressure current, is forced to first pass through themoist layers of the wrapping cloth Z, before passing through the layers of the dry webs m, y. The air current cools down on passing the moist wrapping cloth and be comes saturated with moisture, and the dry web, that is hotter than the moist cloth, is

likewise cooled down, and this more quickly.

Hence, the moist air robs the hotter dry web of the high insulating capacity it possesses due to its high dry heat, whereby the equalization of moisture and heat between the moist cool wrapping cloth and the hotdry web is particularly facilitated.

The described process also affords the peculiar effect, that, even when employed a shortened manner, that is, when less moisture is to be applied to the web than corresponds to the coeflicient of equalization between the wrapping cloth and the web, this smalleramount of moisture is apknown dry steaming pressure steam is used.

producedfrom the moisture in the roll itself isused for steaming the material, while 1n contradlstmctlon thereto, m the hitherto process, fresh high After steaming. the web, the surplus moistureis drawn off infthe form of steam by the air pump p, until a suitable cooled state i has been reached,- by the air pump p. r

Due to the hitherto known dry steaming process operating with high pressure steam,

the web was exceedingly dried and overheated. This noxious effect cannot'arise with. my hereinbefore described process, as the moisture mtroduced'm the roll, 1s evaporated, whereby the webv is protected from becoming exceedingly dry and. overheated.

This is an important advantage that is afforded by my process. What I claim, is':'

1. The-process of treating dry webs of woven material consisting in moistening a wrapping cloth, forming the cloth and web into a roll in alternate layers, and leading a gaseous agent through the roll to uniformly transmit the moisture in the cloth to theweb. f

2. The process of treating dry webs of woven material consisting in moistening a wrapping cloth, forming the cloth and web into a roll in alternate layers, and leading steam through the roll to uniformly transmit the moisture in the cloth to the web.

4 3. The process of treating hot dry webs ofwoven material consisting in moistening a wrapping cloth, forming the cloth and web into afroll in alternate layers, and leading a gaseous agent through the roll touniformly transmit the moisture in the cloth to the web.

'4. The combination for treating dry webs of, woven material of a perforated hollow roller, a wrapping cloth, means for winding said dry web accompanied by said wrapping cloth on said roller, means for moistening said wrapping. cloth prior to its being wound with said dry web on said roller,

and means for sending a gaseous agent through said roller, wrapping cloth, and woven web. 7 p I v i 5. The combination for treating dry webs of woven material of a perforated hollow roller, a wrapping cloth, means for winding said dry web accompanied by said wrapping cloth onssaid roller, means for moistening said wrapping cloth prior to its being wound with said dry web on said roller,and

means for sending steam through said roller, wrapping cloth, and woven web.

G. The combination for treating of woven material of a perforated hollow roller, alwrapping cloth, means for winding said-dry web accompanied by said wrapping cloth on said roller, means for moisteningsaid wrapping cloth, prior to its being wound withsald dry'web on said roller, means for regulating the amount of moisture taken up by'said wrapping cloth,

and means forl sending a gaseous agent dry webs through said roller, wrapping cloth, and

woven web.

HERMANN MALY.

EMU

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