US1911001A - Creping machine - Google Patents

Description

' May 23, 1933. A, SHEESLEY 1,911,001.

CREPING MACHINE Filed Jan. 24. leso 2 sheets-Sheet 2 w gz; 1 u L 6i Q 1 L1 u. s W

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Patented May 1933 UNI-Teo; STATES HormonA A. simnsninr,` oF ron'rLANn, MAINE, AssxGNon To CONTINENTAL Parna- PATENT or-PicE & `BAG CORPORATION, OF NEW YORK, N. Y., A CORPQRATION F NEW YORK i .camine morfina Application filed vJanuary 24, 1930.l Serial No.` 422,971.

This'invention relates to improvements in machines for creping paper, or similar materlal to-adapt it for use in the manufacture of pa er towels and the like.

achines have been devised heretofore for thepurpose of creating crimps or folds of various sorts in a long strip or web of paper fed l continuously through the machine. These usually have involved the use of a plurality ofmetallic rollers which are grooved ,or corrugated or otherwise formed with cooperating teeth or projections adapted to -in a numberof longitudinal lines. v

Difficulties have arisen in these machines however, fparticularly in the way of providing a uni orm feeding of the paper throughout 'its .entire width. It is Ausually either `necessary or desirable that `the strip 'of paper handled by the machine be of considerable width, as much as 8O inches or even more,

-so that the problem of uniform advance of the paper over this entire width becomes an important one. Where paper is fed around and between a series of rollers havin a uniform diameter throughout their lengt ,there is a general tendency for the edges and adjacent portions of the web to be fed slightly in advance ofthe middle portion .of the web. So, in a creping machine, there is a tendency for the lateral lines of the crimpto become distorted and irregular and this distortion may at times be so great as to cause the paper tolbecome bunched and wedged between therollers. Where this uneven feeding of a lonO web has been encountered -in the handling o paper of considerable width in other types of machine, it has commonly been the practice yto provide feeding rollers which are crowned slightly toward their centers soas to compensate for the normal reduction in the feeding at this point.

It is impracticable, if not altogether impossible, however, to adopt this 'expedient in connection with creping rollers due to the fact that the corrugations in the surfaces of the creping rollers are quite shallow, being.

usuallybetween .02 and .03 of an inch in depth; it would be-exceedingly diicult to provide for this depth of kgroove uniformly over a roller which has a crown of almost, if not more than', an equal amount. .Furthermore, since the paper is wet as; it is being handled by therollers, it is necessary`to provide a slight clearance between them equivalent to the thickness of the paper, otherwise the material would be punctured and mutilated. Obviously, if a crown were provided on each of the pair of co-operating rollers it would be impossible to maintain a uniform clearance between them lequivalent to thethickness of the paper and it would not be possible to force the paper into the recesses.

of the rollers throughout their width.

The p-resent invention has for. its principal object the general improvement of creping machines and the provision of means 'for overcoming the 'obstacles usually encountered in these machines. A feature of the invention is the provision of a soft rubber roller, or roller of similar soft, yielding, elastic qualities, in such relation to the creping rollers as to insure their proper functionthe paper. In attaining these results this additional roller serves to hold the paper,

after it has been crimped, in the, grooves lor corrugations of one of the creping rollers,

`and thus .prevents formation 0f loops or the bunching of the paper in later sections of the machine. The use of` soft, iiexible or yieldable material lin the formation of this roller ascontemplated makes it possible to provide the desired crown which aids materially in the maintenance of a uniform feed throughout the wid-th of the roller: Other objects and advantages will appear as the invention is described in'detail in coning and to bring about a uniform feedingof 845 A in which:

Figure 1 is a diagrammatic end view of the cooperating creping rollers, showing their relation to the web of paper fed through the machine. Y

Figure 2 is a plan View, partlyA in Section, showing the relation of the rollers and. their driving gears, and,

Figure 3 is a detail view showing a section of the creped paper produced by the machine. Y

While the invention is disclosed herein as applied to a particu-lar form Aof creping machine adapted to produce a ,creped or crimped paper of a particular design, it is t'o be understood that this disclosure is merely for the purposes of illustration and that the in'- vention may, with slight modification, be applied to machines of other types.

Referring now to the drawings, a web of paper 10, fed from any sui-tablesource in a Wet condition so that it is adapted to be readily molded into or "impressed `with any esired design, if fed around a corrugated .crimping roller 11 which is adapted to be driven at a suitable speed. Rotation of the roller may be effected by means of a pulley 13 mounted aft one end, driven by a belt 14 adapted to receive power from any suitable driving source. After passing partly around.

the roller 11 the paper encounters a second corrugated or grooved crimping roller 15. This roller is adapted to be driven at a constant speed' which is proportional to and preferably directly equal to that of the roller 11. For the purpose of driving this roller, a gear 16 meshing directly with a gear 12 carried by the shaft of the roller 11 may be provided. The rollers 11 and 15 are preferably formed of some metal, such as brass, or other alloy, which will not rust or be subjected to corrosion by the moisture oru other constituents in the paper. The surfaces of these rollers are corrugated, being provided with shallow grooves or depressions leaving a series of upstanding teeth or projections which extend across substantially their entire Width. In the production of al standard form of creped paper suitable for themanufac-y -ture of paper towels, and the like, it has been found desirable to employ teeth'or corrugaltions having -a depth of between .02 and .03

yof an inch and having` a pitch between teeth ofl abouti@ of an inch. The two rollers 11 and -15 are mounted in such relation as to have their teeth or corrugations intermeshing and'they are rotated at such' speed as to maintain them in mesh. It will be obvi- .ous, therefore, that as the paper is fed bethe paper,

periphery of the roller. Preferably, at suitable intervals along the surface of the roller a gap of any desired width forming a circumferential depression will be left between the teeth so that in the course of rotation of the roller these gaps will have no eiect upon the paper while the series of teeth are adapted j to grip the crimped portions of the paper and mar the regularity of the lateral crlmps in some suitable wayso as to produce the desired design. Y

Referring to Figure 3, a sample of the design produced by the machine is indicated. The lateral crimps produced by the co-operation of the pair of rollers 11 and 15 are visible across the entire width of the'strip of paper but they are particularly pronounced along the longitudinal lines 20 where they have not been marred due to the gaps between the teeth of the roller 18. In a series of longitudinal lines 21, however, formed by the teeth 19, the lateral crimps are almost lobliterated by the longitudinal impressions left by the teeth. Since the teeth of the roller 18 do not mesh with the teeth of roller 15, these need not have the same peripheral speeds, although the teeth 19 are less apt to tear the paper if the seeds of the two rollers are maintained the same. t

Upon leaving the co-operating portions of the rollers 15 and 18, the paper may be passed to any suitable conveyor system, on which it will be permitted to dry before being passed to suitable re-rolling or .cutting machines. This conveyor system may, for example, include a roller or pulley 22 adjacent to the roller 18 adapted to carry'a conveyor belt 23 in position to receive the creped web of paper and convey it to any suitable point for further disposition.

Theoretically, the series of rollers 11, 15 and 18 should be capable of producing the d esired effect on the paper withoutthe necessity of providing any 4additional means. However, in actual ractice it has been found thatthe various di culties, hereinbefor'e a1- luded to, are encountered in machines of this sort so that the result 'of the operation of the system thus far disclosed would be the production of irregular crimping efects, and pos-l EEO completely obviated. The roller 24 should' be formed of soft, flexible or'yieldable material having elastic qualities so that it is adapted to force or hold the paper in the grooves or cor--v rugations of the roller 15 without permanently distorting the soft surface ofthe roller.

In' view of the iineness of the corrugations in the roller 15, it is quite important that the roller 24 should be formed of relatively soft .andyieldable material which is capable of entering into the fine variations in the surface.

It has been found that a soft rubber roller is admirably suited to this particular purpose. Rubber lhaving a density of between 100 and 110 under the standard P and J plastometer test has ,been found to be especially desirable. although it -will be understood that rrubber rollers having adiiferent density, as well as rollers formed of other materials, such as felt or the like, having the desired yielding and elastic qualities, will be suited to the requirements. The roller 24 may be formed more or less completely of rubber, or similar soft material, mounted simply upon a slender mandrel or it may be in the form merely of a relatively thin sheet of rubber applied to the outer surface of a roller formed primarily of metal or other suitable'material. The latter construction is regarded as somewhat preferable from the standpoint of expense of manufacture and it is just as effective for the intended purposes,

' provided the rubber sheet is of suicient thickness tohave-the desired yielding qualities.- A construction of this sort is indicated in Figure 2, in which the rubber sheet 25 is shown as applied to the surface of a metal vcylinder 26 which may be in thenature of a heavy pipe shrunk on or otherwise vcarried by a mandrel 27.

The two ends of the mandrel are preferably mounted in a pair of arms 28 pivotally suspended from any suitable point 290i. the main frame of the machine. will in this way be held against the surface of the'roller 15 by its .own weight, which will normally be suiicient. However, if a greater or less .pressure is desired between the contact' against the rotating roller 15. As a result of this arrangement it is possible to apply a The roller 24 1y uniform diameter and the member of yielding material is a crowned roller.

3. A combination'as claimed in claim 1 slight crown to the surface of the roller 24 which will aid materially in bringing about 'i a uniform feed of the paper throughout its width. It has been found thata crownof' between .02 and '.03 of an inch on a roller havlng a mean diameter'of 7 inches gives quite satisfactory results, although a crown of either greater lor less magnitude may be found preferable under varying conditions. Therefore, the-roller 24 not only servesto force and maintain the partly creped paper inthe grooves or corrugati'ons of the roller 15, but it aids'materially in the feeding of a continuous web of paper and in the maintenanceof a uniformity of action of this feed throughout the width of the web. If desired, a similar roller may be provided beneath the roller 11 to assist in producing uniformity of feed in advanceof the first crimping action between the rollers 11 and 15. Such a roller,

at the same time, would serve to provide a slight initial crimp in the paper.- The pro- ;vision of 'this additional roller, however, is

not at all essential as, in fact,.completely satisfactory resultsmay be'obtained by the.` use of a'v single iiexibleroller as indicated.

While various features of the invention have been described in considerable detail and certainspecic .dimensions have been mentioned, it is to be clearly understood that these have been specified merely by way of illustration of one admirable form of the invention. They are not to be regarded as imposing any limitations on its scope. Furthermore, the terms employed throughout the description are to be regarded merely as appropriately designating the various portions of one suitable form of the invention and not, as imposing any limitations thereon.

,What I claim is:

1. In a machine of the class described, means for feeding and crimpinga continuous web of paper, said means comprising a grooved roller, and means comprising a member formed of yielding material such as soft rubber adapted to extend across substantially the whole width of said grooved roller for I maintaining previously crimped paper against bunching and providing for an even wherein the grooved rolleris positively driven and the member of yielding material is a roller frictionally vdriven by said grooved.

roller.

4. A combination as claimed in claim 1V wherein the crimping means comprises a' plurality of grooved rollers providing for two successive crimping actions and wherein the member of yielding materialY contacts with the web at a point between said crimping actions. l v 5. In a machine of the class described a plurality of crimping rollers adapted to crimp a 5 web of paper continuously fed around and between said rollers, and separatenon-crimping means cooperating with one of said rollers to provide uniform feeding of the paper around said roller.

In' testimony whereof., I have signed my name to this speciicationthis 11th day of v J anuary- 1930.

HORACE A. SHEESLEY.

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