US2410189A - Creping machine - Google Patents

Description

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Cet. 29, 1946.

James W JZmuZIe Z Patented Oct. 29, 1946 Louis A. Straubel and James ,W. yStraubel, Green vBay, Wis.; said Louis A. VStraubel assigner to said James W. Straubel, as trustee "Application November 27, 1944, seriaiNo. sesgos This invention relates to a creping machine for lcreping dry vweb material, such as paper and the like, to impart thereto a high degree of softness and stretchability.

It has heretofore been proposed to crepe web material, such as paper, in a dry state by means of a pair of doctor blades ground to conform to the curvature of the creping rolls and'provided With-sharp leading edges held in tight surface contact with the surfaces of the rolls. For various reasons, such prior art devices have proved unsatisfactory for the commercial production of` creped paper. For one thing, the sharp edges of the doctor blades tend to tear the paper web, especially when lightv paper is being creped. Particles of dirt, grit or the like frequently become wedged between the sharp doctor either tear or weaken the paper as it passes thereagainst. v

In accordance withthe principles of our invention creping platesr are providedvhaving relative'- ly blunt, or rounded, leading edges.v Preferably, the rounded 'leading edges are held in closely spaced relation to the surfaces ofthe Acreping rolls, rather than in .tight vpressure relationship -as heretofore. The creping plates need not be s claims. (c1. 154-30) tion to provide a creping machine including creping plates having blunt, or rounded, leading edges and providing a restricted passage for the accumulation of the bunched creped paper, and including evening rolls driven at a much slower rate of speed than the creping rolls for insuring a uniform and even' distribution of the creped paper from such accumulation Within or between the creping plates.

,Other and further important objects of Athis invention will be apparent from the disclosures in the specification and the accompanying drawblade edges and the surfaces of the rolls and Itis therefore an important object of our invention toY provide a creping machine for the .creping of web material, such as paper and the like,in ardry` state, the machine being provided with creping plates having blunt, or rounded, leading edges that extend intofthe' deliveryside of.v the-bite-of thek creping rollsbut are prefer' ,ably slightly spaced from the roll surfaces or atleast not in pressure contact therewith. f

It is aofurtherimportant object of this invention to provide a creping machine for the creping offdry web material, such as paper, using creping plates having blunt, or rounded, leading edges spacedslightly apart to provide a restricted passage between the creping plates, the blunt leading :edges in cooperation with the surfaces of the creping rolls adjacentk the bite therebetween serving to. upset the web substantially' at the bite itself and'to cause the `upset paper to accumulate Ain'bunched4 condition between saidcreping plates.

ing.

On the drawing:

Figure 1 is a longitudinal sectional view of a creping machine embodying our invention.

Figure 2 is an end elevational view with the creping rolls removed.

Figure 3 is an enlarged, fragmentary view illustrating the arrangement of creping rolls and doctor plates. v

The reference numeral I 0 indicates a supply roll of web material mounted upon a stand II and provided with the usual braking means (not shown) for securing the proper tension on the web I2 as it is -unwound from roll. A pair of feeding and creping rolls I3 and I4 are mounted ina pair of stands I5 with their axes in vertical alignment. Said rolls I3r and I4 are provided with hard smooth surfaces, preferably of chilled steel, to prevent scoring of the rolls by the paper in the creping operation. The ends of the shaft I6 of the upper roll I3 are journalled in a bearing block I'I that is vertically adjustable between the upright guides I8 of said stand I5. A bolt I9 threaded through the cross piece 20 at each end vof the guide stands I8 serves to adjust the pressure between said feed rolls I3 and I4 at the bite 39 therebetween. Y'

A pair ofevening rolls 2i Vand 22 are mounted vin a stand 23 behind the feeding and creping rolls indicated by the reference numeral. I2a. "The v I It isa further important objectv of this invensurfaces of said rolls 2| and 22 may suitably be knurled, as indicated at K, although they may also be smooth.

Between the sets of feeding and creping rolls and evening rolls there is mounted a pair of rigid creping plates 24 and 25. Said plates extend the full width of the rolls and are supported so as to be adjustable relative to each other to provide a .'gap 26 therebetween. For this purpose, the creping plates 24 and 25 may be suitably carried by sets of straps 21, 21 and 28, 28 from the roll supporting stand 23, the straps being slotted and provided with bolts 29 and 3.0 for securing-saidstraps to said supporting stand 23. Adjustment of the width of the gap 26 between said creping plates 24 and 25 may be performed by loosening the bolts 29 and 30 and moving the plates toward or away from each other.

The creping plates 24 and 25.-, as `best shown. Yin Figure 3, comprise a pair of rigid Aplates .having plane opposed surfaces '5I and 32, respectively, which are equally spaced from a plane tangent to said bite 39 between the 'feedingandcr'eping rolls I3 and I4. Said' surfaces 3l and 32 together form the restricted passage 2S. The leading edges 33 and 34 of said creping -plates 24V and 25 are rounded upon a radius that may vary Vbetween -g'and 1A of aninch. Rearwardly of said'leading edges JP3 and 34, the creping plates are relieved, as at 35 'and '35, respectively, toprov'ide clearance between the .plates and the surfaces ofthe rolls I3 .and 14. The creping plates are similarly relieved at their rear edges, as at '31. and 53 4for clearance with the surfaces of the evening rolls 2| and 22. I-t will kbe noted that sa'id leading edges 33 Vand 34 extend into close proximity with the bite, `indicated at'39, between said Arolls 'Iand 'I4 and into closely spaced relationship with the surfaces of said rolls, but preferably not in vactual contact therewith.

A pairo'f .draw rolls 4B and 4I `are mounted behind the eveningrollsin vertical pressure vlrelationship to each other upon la .stand 42. The upper roll 4.0, like the roll I3,hasashaft`4Il that is journalled at .its ends in bearing blocks lidi-,hat are vertically adjustable between `.the -upright guides of said `stand 42, as b-y means of -a pair of bolts `45. r-lhe rolls 4i! and 44 yare preferably` provided with asoft or yielding surface, suchas rubber or felt, so as not to calenderout thecrepe that is put into the web 42a. The :speed of the draw rolls 4G and 4I can-be regulated to-leaveany surface speed -of therolls Vand Y41| is the same as that of rolls I3 and I4, vthey willtend to -pull out-most of the-crepe but will nevertheless leave the paper considerably softer. From the draw rolls 4D and M the web I2asis rewound` .into a roll 41.

The lower feed roll `I4-znay.suitablybedriren by means of a-beltl -passin'gyarollhd agpulley 49 that is keyed tothe roll shafti. The upper feed roll vI3 is driven throughapairofmeshing pinion gears I and 52 secured to said/,shafts@Tand-145, respectively. This insures the rolls i3 and I4 being driven at the same rate of surface speed.

The evening rolls 2i Aand 22 may be geared together by pinions 53 andY 51,3but areindependlrently driven by any suitable means `(not shown) at a `greatly reduced surface speed with respect ito said feed rolls, as for instance in the ratio of l to'35. These rolls regulate therate of discharge -cf the bundles of creped paper from the accumulation 55. The reduced speed of the rolls is neces- .sary because the creped paper is Vin bundles as it :passes throughrthe evening rol-ls. These rollsthus :also serve to put back pressure on thepaper to `cause it to be upset back in the bite of the rolls I3 and I4.

The shaft V59 also carriesa sprocket gear 53 yaround which is trained a chain-54 for driving a sprocketgear -55 secured tothe .shaft 56 of the lower draw roll 4I. The upper draw roll '4D is percentage `of crepe :desired in the paper,.cr if .the

4 driven through intermeshing pinions 62 and 6I secured to the shaft 56 and the upper shaft 43, respectively, so that the draw rolls will be driven at the same surface speed. The surface speed of the draw rolls 40 and-4-I is preferably slightly less than that of the feed Arolls I3 and I4.

The operation of the machine of our invention .is as follows:

In starting up the machine, the leading end of the web I2 is fed into the bite 39 between the feeding andcrepingfrolls I3 and lli. The Web tendsto pass 1in a straight line between said rolls and not` to :adhereto either of them. As the web passes into the restricted passage 25 between the creping'platesthe friction of the web upon the plane 'surfaces 3i and 32, as well as the slower moving surfaces of the evening rolls 2I and 22, `causesrthe paper to backup and fold upon itself until van accumulation -of -bunched-up.-.paper as indicatedat'ii'., is produced. The pressureplaced upon the web ahead of the leading edges33 and 34 causes the paper to be upseton the `delivery `side of the rolls-Iand I4Y.substantially back into the bite 39. v

As the pressure-of the paper in back ,ofitforces thebunched-up accumulation G35-out .of the `pas'- sage 2G, the crepedpaper Zafis caused .-.tofpass Abetween the evening rolls 2i and 22 which serve .t0-deliver the -creped `;pap erevenly -and uniformly. The creped web-'I-Za is then passed through the bite of the rolls 402and 4I f-rom'which the creped web passes throughjtheV rewindento :be wound up yinto a roll 41. Thepressure betweenvthedraw rolls 40 and 4I is controlledsothatfthe resilient surfaces :of these rolls 'will no ttake out too :much

Aof the crepe. i

By virtue of the construction aboveifdescribed, the-.machine of our invention iscapable of Aproducing `commercially.a heavily :creped 'webofipapen. starting with'the web indry fcondition. As illustrative of some rof lthe'moreimportant dibmensions, the. leadingedges 33 .and 34 mayfbe vset within .3A -and .lilinch'es :from y.the bite. 39. .One rof the .leading edges may. be slight-lyJ .inlad- .vance of theother, `orfithe two :edges amaytL-be .in "vert-ical alignment. The restricted v.passage "2B may suitablylbe around lpfof :anginch in fwidth, depending upon `therbasic 'weightgof the .paper .being creped. vThe .knurledevening .rollsJZI and 12 2; maybespaced apart .bylas .much as 1/8 .and ofan'in'ch.

It will, of V-course,'beunderstood vthat various details of construction may-be var-ied through -a widerangew-ithout ydeparting from the principles of: this invention Landit is, v1,hereforev, not'the .purpose to :limit theipatent 'granted iher-eon other# wise. than fnecessitated L byith'e vscope fof@ thet fap- .pended'claims .Y

Whatiwefelaim is: i y Y In .la crepin'g f machine v -forl-paperand other 'web niateriaka @pair-of smooth` surfaced rolls forming abitethereb'etween Sinto which said web -is drawn, a painofirigidlymountedcrepingplates .prOVdi-ng: `a .restricted Lpassage therebetween and 4extending into. the :deliveryzside :of :said .bite-,fl said Vplates having `blunt leadingnedges:closely ad? jacent: to .but fniot :in :pressurezscraping v.relationyShip' wii'fh'jsaid roll'rsurfaces, v.sa-id :blunt :edges in cooperation' with: tnemalilsiof '.saiid :restrictedpassage having thev effect ofbackingasaid web vup upon .'-ritself vinvsaidbite `alfiead .of-said leading .edges to ,be there cre-ped, .and means rfor. drawing said, creped web ethrough and out -i of Vsaidmre- .stricted passage at ,a rate v`of tspeed; ysuch` las'. to cause said web to retain much of its crepe.

2. In a creping machine for paper and other web material, a pair of smooth surfaced rolls forming a bite therebetween into which said web is drawn, a pair of rigidly mounted creping plates providing a restricted passage therebetween and extending into the delivery side of said bite, said plates having blunt leading edges closely adjacent to but not in pressure scraping relationship with said roll surfaces, said blunt edges in cooperation with the walls of said restricted passage having the effect of backing said web up upon itself in said bite ahead of said leading edges to be there crepedy means for drawing said creped web through and out of said restricted passage at a rate of speed such as to cause said web to retain much of its crepe and a pair of spaced evening rolls for insuring a uniform and even feed of creped paper from said creping plates to said drawing means.

3. In a creping machine for paper and other web material, a pair of smooth surfaced rolls forming a bite therebetween into which said web is drawn, a pair vof rigidly mounted creping plates providing a restricted passage therebetween and extending into the delivery side lof said bite, said plates having rounded leading edges closely adjacent to but not n pressure scraping relationship with said roll surfaces, said rounded edges in cooperation with the walls of said restricted passage having the effect of backing said web up upon itself in said bite ahead of said leading edges to be there creped, the creped web bunching up in said restricted passage to form an accumulation therein, a pair of knurled rolls having slightly spaced surfaces for receiving the web therebetween from said accumulation and feeding the web uniformly and evenly and means for drawing said creped web through and out of said restricted passage and between said knurled rolls at a rate of speed such as to @aus said web to retain much of its crepe.

4. In a creping machine for the dry creping of paper and other web material, a pair of feeding and creping rolls having smooth hard surfaces providing a bite therebetween for receiving the web material, a pair of rigidly mounted creping plates having plane opposed surfaces providing a restricted passage therebetween, said plates having rounded leading edges positioned adjacent to said bite on the delivery side thereof and in closely adjacent relationship but not in pressure scraping relationship to said rolls, said rounded edges in combination with said opposed surfaces having the effect of backing said web up upon itself in said bite ahead of said leading edges to be there upset and creped, the creped web bunching up in said restricted passage to form an accumulation therein and a pair of spaced knurled rolls for controllably releasing said creped web from such accumulation.

5. In a creping machine for the dry creping of paper and other web material, a pair of feeding and creping rolls having smooth hard surfaces providing a bite therebetween for receiving the web material, a pair of rigidly mounted creping plates having plane opposed surfaces providing a restricted passage therebetween, said plates having rounded leading edges positioned adjacent Ito said bite on the delivery side thereof and in closely adjacent relations-hip but not in pressure scraping relationship to said rolls, said rounded edges in combination with said opposed surfaces having the effect of backing said web up upon itself in said bite ahead of said leading edges to be there upset and creped, the .creped web providing a pressure bite therebetween for receiving the web material, a pair of rigid creping plates .having opposed plane surfaces equally spaced from a plane tangent to said roll surfaces at said bite, said plates having rounded leading edges positioned adjacent to said bite on the delivery side thereof, means for adjustably supporting said plates in fixed adjusted position to provide a restricted gap between said opposed surfaces, said rounded leading edges in combination with said opposed plane surfaces having the effect of backing up said web upon itself in said bite ahead of said leading edges to be there upset and creped, the creped web bunching up in said restricted passage to form an accumulation therein.

7. In a creping machine for the dry creping of paper and other web material, a pair of feeding and creping rolls having smooth hard surfaces providing a pressure bite therebetween for receiving the web material, a pair of rigid creping plates having opposed plane surfaces equally spaced from a plane tangent to said roll surfaces at said bite, said plates having rounded leading edges positioned adjacent to said bite on the delivery side thereof, means for adjustably supporting said plates in fixed adjusted position to provide a restricted gap between said opposed surfaces, said rounded leading edges in combination with said opposed plane surfaces having the effect of backing up said web upon itself in said bite ahead of said leading edges to be there upset and creped, the creped web bunching up in said restricted passage to form an accumulation therein, and a pair of spaced rough surfaced rolls driven at a much slower rate of speed than said feeding and creping rolls to aid in the uniform delivery of the creped web material from said accumulation.

8. In a creping machine for the dry creping of paper and other web material, a pair of feeding and creping rolls having smooth hard surfaces providing a pressure bite therebetween for receiving lthe web material, a pair of rigid creping plates having opposed plane surfaces equally spaced from a plane tangent to said roll surfaces at said bite, said plates having rounded leading edges positioned adjacent to said bite on the delivery side thereof, means for adjustably supporting said plates in fixed adjusted position to provide a restricted gap between said opposed surfaces, said rounded leading edges in combination with said opposed plane surfaces having the effect of backing up said web upon itself in said bite ahead of said leading edges to be there upset and creped, the creped web bunching up in said restricted passage to form an accumulation therein, a pair of spaced rough surfaced rolls driven at a much slower rate of speed than said feeding and creping rolls to aid in the uniform delivery of the creped web material from said accumulation and a pair of resilient surface rolls for drawing; said creped web through said rough surfaced rol s.

. LOUIS A. STRAUBEL. JAMES W. STRAUBEL.

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