US 2752085 A
Description (OCR text may contain errors)
June 26, 1956 w. H. BRYCE 2,752,085
PAPER BAGS Original Filed Aug. 3, 1949 2 Sheets-Sheet 1 m x Q N INVENTOR.
W. H. BRYCE June 26, 1956 PAPER BAGS 2 Sheets-Sheet 2 Original Filed Aug. 3. 1949 i is-.7
I I E. 11
l/VU/ CIA IN VEN TOR. w
filfarney United States Patent PAPER BAGS William H. Bryce, Memphis, Tenn., assignor to Dixie Wax Paper Company, Dallas, Tex.
Original application August 3 1949 Serial No. 108 341. Divided and this application Jnne 23, 1950, SeriafNo. 170,010
2 Claims. (Cl. 229-55) The present invention relates to the method of manufacturing paper bags and the bags produced thereby which latter are suitable for holding edible commodities, particularly potato chips.
An object of the invention is to produce a reinforced paper bag having high resistance to moisture and moisture vapors and yet have a transparent window through which the edible articles stored therein may be readily visible to the purchaser thereof.
Another equally important object of the invention is to produce bags of the aforesaid character from a stock roll of glassine paper with the aid of conventional coating and bag making machines whereby they may be economically manufactured and render the same commercially desirable.
Other objects of the invention will in part be obvious and in part pointed out hereinafter as the description continues.
Fig. 1 represents a schematic showing in elevation of the path of travel of the webs or sheets of paper from their respective stock rolls through a conventional waxing machine.
Fig. 2 is a detail plan view of the laminated and sealed together sheets of paper after being waxed and prior to its delivery to the bag forming machine.
Fig. 3 is a cross sectional view of the same.
Fig. 4 illustrates in perspective a bag formed from said laminated sheets of paper and said View being taken from the front face of the bag.
Fig. 5 is a similar perspective view showing the rear face of the bag.
Fig. 6 illustrates schematically a cross sectional View of a relatively wide sheet of glassine paper coated with wax compositions.
Fig. 7 is a similar cross sectional view of the same coated sheet of glassine paper as preformed prior to its delivery to the bag making machine.
Fig. 8 is a detail plan view of the same.
Fig. 9 illustrates in perspective an expanded bag as made upon the bag machine from this single sheet of glassine paper and said view being taken from the rear side of the bag.
Fig. 10 is an enlarged plan view of this paper bag, and
Fig. 11 is a cross sectional view taken on the line 11 11 of Fig. 10.
In preparing sheets of paper to render the same moisture-vapor proof prior to their delivery to a bag forming machine a stock roll 14 of glassine paper is mounted upon the waxing machine whereby its web 15 has molten wax applied to one or both faces thereof. A pair of spaced stock rolls 16 of paper arranged at the opposite sides of the roll 15 each have their webs fed to the waxing rollers whereby one or both sides of each may receive the molten paraflin wax. The molten paraflin wax stored in receptacle 18 is applied to one face of each of the webs 15 and 17 whereas the molten paraflin wax stored in the receptacle 19 is applied to the opposite face of each of said paper webs. After the webs of paper 15 and 17 are ice waxed they are joined together into one composite web 20 where the latter is dried and cooled over the refrigerating rollers 21 prior to being wound into single roll 22. It will be noted from Figures 2 and 3 that the web of glassine paper 15 is of a greater width than that of the webs 17 so that after waxing each web, the webs 17 are drawn over the marginal edges of the web 15 and forced together whereby the molten wax will cause the webs to adhere together, as best shown in Fig. 3, as they are continuously drawn through the waxing machine to form the composite single web 20 which latter is wound into the roll 22.
The waxing of the glassine web 15 greatly increases its transparency and if the webs 17 should be made from glassine papers, they become translucent when sealed to the web 15. However, I preferably use super-calendised opaque sulphite paper in forming the web 17 as it greatly reinforces the bag structure. The webs 17 may be in colors or a combination of colors to render the bags more attractive.
This stock roll 22 is thereafter mounted upon a conventional bag forming machine and its composite web 20 first fed through a former whereby the laminated edges thereof are folded over to form the tube of a width equal to that of the bags made therefrom. The marginal overlapping edges of the tube are hot sealed together to form the seam 23. One end of the tube is then folded over and sealed to form the bottom 24 of a bag and finally the cutter of the bag machine shears off the tube into the required length of the bag forming the usual opened or filling end 25 of the bag.
From Fig. 4 it is apparent that the web 15 forms a window throughout the entire length of each bag and the webs 17 reinforce the remaining portions of the bag. However, certain portions of the bags window may be reduced by printing upon the strip 15.
To produce bags according to the modified form of the invention as illustrated in Figs. 6 toll inclusive of the drawings, only a single stock roll 14 of glassine paper is employed. The web 1 of this stock roll is first waxed by the molten paraflin Wax contained in the receptacles 18 and 19 of the waxing machine and thereafter the coatings 4 and 5 are applied to the opposed marginal edges of this single Web from the molten wax-rubber-like composition contained in the receptacles 26 and 27 as represented in Fig. 1 of the drawings. After this rubber-like composition is applied, the so-coated web passes through the drying and cooling stages and is wound upon a stock roll similar to that of the roll 22.
The coatings 2 and 3 of paraflin wax extend only over the medial portion of the web 1, as illustrated in Fig. 6, and a pair of spaced rollers feed the rubber-wax-like composition from the receptacle 26 to the surface 4 of the web and an additional pair of spaced rollers apply the coatings 5 to the opposite face of the web 1 from a receptacle 27 containing the molten rubber-wax-like composition. All coatings are applied as the web 1 is drawn continuously through the waxing machine.
The central wax coatings 2 and 5 may contain pure parafiin wax or a composition containing parafiin wax and an artificial resin of courmarone or indene types or mixtures thereof applied to the web 1 in the manner as described in my former Patent No. 2,118,152, dated May 24, 1938 or the wax composition may be prepared as that set forth in my prior Patent No. 2,271,492 dated January 27, 1942. However, the wax coatings 2 and 3 should not only render that area of the glassine sheet of paper so covered moisture-vapor proof, but should be such as will materially enhance the transparency of the paper sheet so as to provide a window through which articles may be readily viewed theretln'ough.
The wax composition coatings 4 and 5 preferably contain, in addition to the paraflin wax, a cyclized rubber 3 derivative and a rubbery hydrocarbon material such as is set forth in my Patent No. 2,367,563 dated January- 16, 1945. These waX-rubber-like coating compositions somewhat decrease the transparency of the glassine paper. web, butstill such areas of they glassine paper where so-coatedare. translucent. V
While the web 1 passes through the waxing machine and afterso coating the same, it is dried and cooled s'o that it'can be rewound upon a stock roll and'this so-coated roll of paper, similar to the roll 22, can thereafter be delivered to the bag making machine when required.
Prior to delivery of the coated stock roll to the bag machine or by an attachm'entto the latter, the opposite. marginal edges of the web 1 may be folded over in the.
manner as is best illustrated in Fig. 7 of the drawings to form the two ply sections 6 of the sheet and a center.-
transparent section orwindow 7 between the same.
As thisso-coated and folded sheet of glassine paper passes through a conventional hag makingmachine, the. marginal edges are caused to overlap and then are sealed together along the seam 8 to form the envelope. This. envelope has formed therewith the conventional bellowed. side walls 9 producing the rear wall 10 and. the front wall 11. The folded marginal sections 6 of the web 1 extend completely over the rear wall 10 and side Walls 9' of the bag as is best illustrated in Fig. 11 of the drawings'. As these folded sections 6 terminate with the opposite sides of the window section. 7 of the. web, only those portions 12 of. these folded sections extend along the opposite sides of the front wall 11 of, the bag. One end of the envelope so formed. by the bag. machine is turned'ovcr and sealed to the wall 10 tov form thebottom.
13' ofthe bag. As the so formed tube or envelope leaves;
the bag machine, it is sheared off to the proper length toprovide the opened end ofpthe. bag with the. usual flap144.
The. folded sections. 6 of the web will be heat sealed while passing through the bag machine due to the waxthat indicated by the numeral 15 in Fig. 10 of the drawings. The printing upon the bag is preferably made upon the glassine sheet prior to coating the same and may extend over portions of both the rear and front walls of the bag, whereby those portions of the glassine paper not having printing thereupon will permit articles within the bag to be viewed from the outside thereof, but better seen from the transparent window 15 than through the translucent. or non-printed sections of therear wall lti'of the bag.
The bag so manufactured will not only have moisturevapor-proofj qualities, but; will bereinforced by the multi; ply walls thereof and yet havea window-in the. front;wall thereof whereby one may readily see the contents thereof.
I claim: 7
l. A paper bag formed from a single web comprising a sheet of transparent paper, layers of waX-rubber-like compositions, covering the opposite. arginal portions of said sheet witha transparent medial portiontherehetweep said sheet. having said; covered marginal portions. being bent providing a double thickness thereof and said sheet beingbent forming a. paper bag with said double thicknessmarginal portions providing the. side and rear walls ofsaid bag and said transparent medialportion providing';
a. window within. the front: wall ofsaid bag.
2. A paper bag comprising a web. of transparent paper,
strips of. material positioned each on a marginal portion ofsaid paperweb, awaxcoating applied to bothfaces of said web and said strips for increasing the transparency, moisture and moisturervap or-proof qualities of said web and interlocking said. web and said. ma erial p o din said web with integral reinforcedmarginal' sections, sjaidf web being. folded into; a bag with. ai in egral margina References Cited in the file of thispatent UNITED STATES PATENTS 1,868,069 Munson July 19, 1932 1,950,232 Edgerly Mar; 6, 1934 2,367,563 Bryce Jan. 16, 1945 2,370,090 7 Thies et a1. Feb. 20, 1945 i