US2509125A - Glued-bag and method of producing the same - Google Patents

Description

c. K. BILLEB l GLUED BAG AND METHODv 0F PRODUCING THE SAME 1 f EiledfJune 21, 1947 2 Sheets-Sheet l .xwhmw INVEN TOR. BQXQM ATTO/A/i/.

Iluulluillllululn May 23, 1950 c. K. BILLEB 2,509,125

GLUED BAG AND METHOD OF' PRODUCING THE SAME Filed June 21, 1947 2 Sheets-Sheet 2 Patented May 23, 1950 A l 1 32 yThe present' inventionerelates Lgenerally to'iimavantages -fofzth'e '-inventi'onswillbe sapparentrom Aproveinents in the art of manufacturingbag-like vnahe.following fdetaileddescripton. receptacles and relates lmore -specifcally Ito an clearrc(inceptionaoftheseveral stepszi-nvolved :improved 4bag 'structure 'and to an 'improved ginithempizm/zed :method-of 'producing :thefifnew method '.of'and apparatus forlproduoingthefim- --fgftuedsbagarandffottypcaifapparatus :,'forieect- 'proved structures or articles. ling#commercialfexploitationrof'dzlflezmethodunay 'It has .heretofore Lheen Acommon commeroial #befhadrbyfreferringtozthezdrawirrgs accompanynpractice to manufacture vvbags for :merchandising Ysing. and '-xfOI'mHg `1 a vipart of athis "specification .'ziiverse commodities, of heat Vsealalle ribon whereinrlike referencercharactersesgnatefilthe stockrgbyinitially forming the stock-into an 'elon- 10 ,fsamemnsimilar"parts in"thef variousfyiewsgated "flat :'tube, bythereafter severingthe 4tuloe 'Fig. :isfa-.di-agramrnaticeside iviewtof aftypoal finto sections `of suitable length by subsequently installation for automatically producing :my'rim- ,'folding an end .of each liiattene'd tube sect-ion l:proved@gluedfbfagsfrl aPdISU-CGSSSOH;

upon itself, and by finally 'applying heat and fFg. *Zeis'anfenlaiigedniagrammatic Sidewiew rpressure to eachiolded over porti-on itoi-heatseal l15 yofwthe bag-rhot-tom foldingfand eglueingrotorfconthe .end of the tube section andtoithus produce Istituti-ns1 aqua-ft of the" installation OfeEig.. 1s .a 'bag 'having a :thoroughly `sealed bottom. In .F-ig. :3 .is afvf-urth'erfenlargedfdiagramedepicting somecasesand especially Where aiiquidtightbot- -xthefsucoessivelbag bottom;formingfstepsfzmvpwed .tom was requiredthe tube endfhasbeen double in my new bag production method; Lfolded and heat sealed, and :While l'these prior '20 Eig. is :a @12m TAVS'W'J 4511 bOltO-mfplfin 0f heatsealing methods are quite "satisfaot'oryas .-onelothe\improvedlbags--producedby'mymesent .applied `to .stock whichlisvcapable .of being'sealed JIISSIIGO; -and with. the mere application of heat 'and g pressure, .-Fie. v`5 is a eansideralalyY enlarged fragmentary A.such stool; Yis not always 'available' andY 'mayfnot perspective VGWHO ythe13017110111 portion'- Ofeoneff be esati-sfactory .for 'the intended use. "It Ifre- :.25 he -umpmved abags, :shewingvfthe sealing Vfolcls quently happens .1;h9',1;..0ther types of non-,heatyepartialliyadisrupted to-folearlyfreveal therbagrzbotftered rinproducing .such ...glued Lbottom lbags `and @11d -iallpallllt fnnjheaieelable --matelfiaL it 1in-maintaininglthebagbottoms 'tightly and per- `l'S 1.107 my` desire or .intention to llnrleeeSSallY `mmlermy Seam@ againstaeakage when ktherbags limit ,the .inventionoy -mrtueaof --.ths :rrestricted ,Substances therethrough' the ^`tuhe .inwardly to voverlapping ,position and :Another 1.important object ofthis invention-is by '-adheslv'ely eumtmg 'the fovellapped ribbon topmvde animpmvedmethod .of Apmducmgheb edges. .I,thenseyenthetube.untosuocessive secmetioally 'sealed :glued v.'hottom vbags from s'rela- "mms "Sutab1e'-l-ength after Which'th'cmire' tivelyfthin vribbon stockfin rapid succession fand :gl

gt-nt f th tu, t. ,t attached@.theadjacenaourer wan omhemubuje- No. .Jes Ve presen Ilm/en 1011 lsf y 0 .larfsectiomtolprovideaetemporaisy hottomgolosure P1' OVIe'SIm-Ple an'd highly emclent zippafratus for l=50 ,hayingatdeastour..thcknessesof .the'sheetstock eiecting automatic exploitation vof '.theumproved.

p K y throughout its area. The ,preliminarilygiolded 1h35 producing method and -01`-manufactur1ng v4and.glued.bottotnportion offeaohhagseotion, is

Y .theimemved base-man expeditousandreliable thereafter folded .upon itseif.a1ongaiinexfmanner. tending across the ...bag .intermediate the lower These and other :more specific -objects and laid-. 55 and riipper edges .of v.th.e ..1'nitalfold, and the mesultant iinal fold is adhesively connected to the outer surface of the remainder of the preliminary fold and to the same outer wall of the bag beyond the zone of attachment of the original fold, thereby completing the bag bottom. The nal bag bottom closure thus produced, has at least eight thicknesses of sheet material throughout an area extending upwardly along the bag for a considerable distance, and also has at least as many thicknesses of stock at the extreme lower end thereof; and each bag closure is hermetioally sealed along three extensive superimposed areas of adhesive, thus providing a triple seal.

When carrying on commercial exploitation of my improved bag producing method, I prefer to utilize an installation substantially as shown diagrammatically in the drawings, in order to rapidly, automatically, and effectively construct the successive bags. Referring to Figs. 1, 2 and 3 of the drawings, the initial thin and flexible ribbonv8 of any relatively impervious sheet stock, such as regenerated cellulose, may be supplied in the form of a rotatably supported roll 9 from which the ribbon 3 may be constantly withdrawn by a set of draw rolls I0, supplied along an edge with glue or other adhesive by a center seam glue wheel II, and converted into a constantly advancing flat tube having a longitudinal glued seam I2 at the overlapped ribbon stock edges by a tube forming unit I3. The tube thus initially formed may be provided with opposite inwardly extending side pleats I5 extending parallel to the seam I2 as in Fig. 4, and immediately after the seam I2 has been completed, the advancing tube may be delivered by another set of draw rolls IS to a cut-olf knife assembly which severs the continuous tube into successive tube or bag sections |8 of suitable length, in a well known manner.

The successive tubular bag sections IB are delivered by a set of breaker rolls I9 from the severing zone to the upper rear portion of the periphery of a rotating bag blank conveying and bottom forming cylinder or rotor 20 having two revolving cylindrical tuckers 2| associated therewith. This cylindridal rotor 20 is rotatable within a frame and is provided with an annular series of equally spaced peripheral gaps 22 within each of which a clamping plate 23 is swingably disposed for oscillation about the axis of a carrier pivot 24, so that each plate 23 may clampingly cooperate with the opposite sides of its confining gap 22. While only two of these gaps 22 and plates 23 have been shown in the diagrams, there are in fact six or more sets of gaps and plates spaced uniformly about the axis of the rotor 20, and the supporting pivots 24 of these plates are mounted in and are revolvable by the rotor. The outer ends of each of the pivots 24 are provided with rock levers 25 each having a roller 26 journalled in its swinging end, and these rollers 25 coact and are constantly urged into engagement with fixed cams 2'|, by means of tension springs 28. This cam and lever assemblage is such that when the rotor 2|) is revolving in the direction indicated by the arrow, the successive clamping plates 23 will be swung into clamping engagement with the opposite sides of their confining slots or gaps 22 at timed intervals so as to clamp and to release various lower end portions of the successive bag blanks or sections I8.

The two revolvable cylindrical tuckers 2| which rare disposed above and forwardly of the rotor are rotatable in unison with but in directions opposite to the direction of rotation of the rotor cylinder 20, and each tucker 2| carries a pair of diametrically opposite radial tucking blades 30 which are adapted to enter and leave the successive rotor gaps 22, and which are also cooperable with adjacent adhesive or glue supply rollers 3| so as to receive adhesive therefrom. As shown in Fig. 2, there is a glue transfer roller 3| provided for each tucker 2|, and the glue transfer and tucking blades 3G are adapted to enter the successive rotor slots 22 on opposite sides of the conned and oscillating clamping plates 23. 'I'he tuckers 2| and the glue transfer rollers 3| are of relatively well known construction, but the manner in which these tuckers 2| coact with the rotor clamps and with the successive bag blanks I8 to provide triple bottom seals, is new, and the rotor cylinder is embraced between tuckers by a stationary wall and is provided at its lower front portion with a pick-off blade 32 for removing the completed bags therefrom and for delivering the finished product to a dryer or the like.

During normal operation of the equipment hereinabove described, and while exploiting my new bag producing method, the draw rolls I0, I6 are operating to constantly withdraw at ribbon stock 8 from the supply roll 9, and the glue roll Il is functioning to apply adhesive to the longitudinal side edge portion of the advancing ribbon, while the forming unit I3 converts the stock band into a continuous elongated flat tube having a central seam I2 and opposite side pleats I5 extending throughout its entire length, as shown in Fig. 4. Upon delivery of this fiattened tube from the second set of draw rolls I6, it is severed into predetermined lengths or tubular sections I8 by the knife assembly Il, whereupon the successive severed sections pass between the breaker rolls IS and are deposited upon the periphery of the rapidly revolving rotor 2l, beingguided by the rotor embracing wall in a well known manner, into the paths of revolution of the clamping plates 23 and of the tucker blades 30, preparatory to the application of the improved bottom closures.

The successive steps involved in the formation of the successive triple bottom seals, are illustrated diagrammatically in Fig. 3, and as shown at the extreme right, step I consists of the provision of a transverse fold or tuck 33 some distance from one end of each advancing bag section, by causing one of the glue coated tucker blades 30 of the upper tucker 2| to enter the adjacent rotor gap 22 to the left of the corresponding clamping blade 23. In addition to forming the tuck 33, the blade 30 deposits glue into this tuck; and as soon as the tuck 33 has been formed, the blade 23 is swung toward the left and compresses and clamps this tuck while the tuck producing blade 3U is withdrawn from the gap 22 as indicated by step II, thus also spreading the glue and projecting the end portion 34 of the bag blank I8 outwardly perpendicular to the main body thereof. Immediately followingstep II, the outwardly projecting portion 34 of the advancing tube section I8 is folded back and is pressed and glued against the adjacent centrally seamed outer wall 35 of the bag blank as shown in step III, by causing the portion 34 to engage the rotor embracing stationary Wall of the frame located between the tuckers, in a well known manner, thereby providing the preliminary bag bottom seal.

Each initial bottom seal is thereafter provided with a second transverse tuck 36 and glue application as depicted by step IV, by causing one of the glue coated tucker blades 30 of the lower tucker 2| to enter the same rotor gap 22 to the right of the same clamping blade 23. In addition to forming the tuck 33, this final tucking blade deposits glue into this tuck, and immediately following the formation of the tuck 36 the previously folded remote end portion 3'I of the bag I8 is projected outwardly perpendicular to the bag body and the tuck 33 is compressed, by causing the clamping blade 23 to swing toward the right, as indicated by step V. While the nal tuck 36 is thus clamped, the folded portion 31 of the bag section I8 will be folded back and pressed and glued against both the end part 38 and the seamed outer wall of the bag I8 as shown in step VI, by another stationary frame wall near the rotor periphery, thus completing the bag bottom closure and providing a triple glued seal for each of the successive bags. The clamping plate 23 will 'be subsequently released, and the successive nished bags I8 will be delivered to the dryer by the pick-on blade 32 in an obvious manner.

The improved bag producing method is thus I' carried on continuously, effectively, and automatically with the aid of simple equipment, to complete successive improved bags I8 such as shown in Figs. 4 and 5, in rapid succession. Each of the final bags I8 is provided with an adhesive seal between the folded portions 34, 31, with a second adhesive seal between the bag wall 35 and the remote end portion 38 of the blank, and with a third adhesive seal between the folded portion 34 and the wall 35 and portion 38, as clearly shown in the partially disrupted perspective view of Fig. 5. By utilizing relatively impervious stock or material in the production of these bags, the triple bottom seal thus provided will hermetically seal the bag bottom against egress or ingress of air, vapor or other fluent substances; and by forming the Ibags I8 with the bottom folds overlapping the seams i2, these seams are thoroughly reinforced and protected against opening when the bags are nally filled with commodity. While the normally concealed sealing portions 38 may be made of the same length as the covering portions 34, 31, such lengthening serves no useful purpose and considerable stock is saved by shortening these portions 38 as shown; and when the bags I8 are provided with side pleats I5 the lower outer corners of the bottom of each bag will have sixteen thicknesses of stock While the medial bottom portions will have eight thicknesses, thereby providing a relatively rigid bottom even when relatively thin and flexible sheet stock is utilized.

From the foregoing detailed description it will be apparent that my present invention provides an improved glued bottom bag adapted to be manufactured from relatively inexpensive stock, and the bottom of which is thoroughly reenforced and sealed against leakage. By utilizing the improved method in the manufacture of these bags. the speed or rate of production may be enhanced to a maximum and the cost may be minimized; and the apparatus shown and described herein, while embodying many well known features is reliable and highly eicient in operation, and may be readily modified and adjusted to produce the improved bags in various shapes and sizes. The invention has in fact gone into extensive and highly successful commercial use especially for the production of flat pleated bags I8 from transparent and relatively thin and flexible regenerated cellulose and the like, and these commercial bags I8 have proven very satisfactory for the purpose of packing and merchandising diverse commodities which are amply protected and maintained in fresh and wholesome condition by virtue of the improved triple sealed bottom construction. The improved flat bags may be decorated by printing or otherwise, with suitable indicia, and the side pleats I5 materially enhance the holding capacities of the receptacles.

It should be understood that it is not desired to limit this invention to the exact steps of the production method or to the precise details of construction of the bags, herein described and shown, for various modifications Within the scope of the appended claims may occur to persons skilled in the art; and it is also contemplated that specific descriptive terms used herein be given the broadest possible interpretation consistent with the disclosure.

I claim:

1. An article of manufacture comprising, a bag having a flat substantially rectangular tubular body one end of which has substantially coinciding free edges, said one end being initially folded and glued to the outer surface of the tubular body, and said initially folded portion being refolded in the same direction along a fold line located between the transverse center line thereof and the said free edges and glued against a portion of the initial fold and directly against the tube surface.

2. An article of manufacture comprising, a bag having a fiat substantially rectangular tubular body provided with a longitudinally seamed Wall and one end of which has substantially coinciding free edges, said one end being initially folded and glued to the outer surface of the seamed Wall, and said initially folded portion being refolded in the same direction along a fold line located between the transverse center line thereof and the said free edges and glued against a portion of the initial fold fand directly against the tube surface.

3. The method of producing glued bottom bags, Which comprises, forming a flat substantially rectangular tubular blank having substantially coinciding free edges at one end thereof, initially transversely folding said end of the blank and gluing the fold against the adjacent outer surface of the tube, and refolding the initially folded portion in the same direction along a fold line located between the transverse center line thereof and the said free edges and gluing the second fold against a portion of the initial fold and directly against the tube surface.

CLYDE K. BILLEB.

REFERENCES CITED The following references are of record in the le o-f this patent:

UNITED STATES PATENTS Number Name Date 917,124 Pierson Apr. 6, 1909 1,782,240 Litchfield Nov. 18, 1930 1,926,065 School Sept. 12, 1933 1,950,232 Edgerly Mar. 6, 1934 1,975,253 Connolly Oct. 2, 1934 2,012,357 Shea Aug. 27, 1935 2,013,672 Royal Sept. 10, 1935 2,023,782 Driver Dec. 10, 1935 2,294,848 Moore Sept. 1, 1942 2,345,434 Sterling Mar. 28, 1944

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