US3163352A - Paper bags - Google Patents

Description

Dec. 29, 1964 J. J. FEsco 3,163,352

PAPER BAGS Filed May 7, 1962 2 Sheets-Sheet l f90/VCH M TAPE car-arr mp5 Z F/6.5 F/a i4 )i F/a? Ej t t INVENTOR. Ja//A/ J /Fffco lli. BY

J. J. FESCO Dec. 29, 1964 PAPER BAGS 2 Sheets-Sheet 2 Filed May 7, 1962 United States Patent O 3,163,352 PAPER BAGS Sohn Il. Fesco, Baldwin, FLY., assigner to Stridley Paper Company, Ine., a corporation of New York Filed May 7, 1962, Ser. No. 192,731 3 Claims. (Cl. 22962) The present invention relates in general to paper bags and in particular to vacuum cleaner paper bags and a method for forming the same.

Disposable bags of the type which are used as dust collectors in vacuum cleaners or the like u1u-st be relatively inexpensive and yet must be provided with speciiic structural characteristics so as to be as air pervious as possible and yet be capable of retaining dust particles and other houshold debris picked up by the vacuum cleaner. In addition the bag must be provided with end closure seams which are strong so that they will not be opened when subjected to the pressures provided within conventional vacuum cleaners. Heretofore, in order to provide strong end type closure seams, the transverse edges of the blank which formed the vacuum cleaner bag were seamed shut by sewing machines or staples and the seams were then enfolded in adhesive by secured tape webs which were tightly pressed into position over the seams to form the desired strong air-tight end closures. The stitching or stapling operation is particularly important to prevent the opening or withdrawal of the pleats formed along the side edges of bags of this type. The dual operations involved in iirst stitching or stapling the end closure seams and then enfolding themwithin adhesive by secured tapes materially added to the cost of producing the vacuum cleaner bags.

In view of the foregoing it is an object of the present invention to reduce the cost of manufacturing vacuum cleaner bags which are provided with pleat securing means and strong airtight end closures.

It is another object of the present invention to obviate the necessity for stitching or stapling the transverse edges of the vacuum cleaner bags in order to provide strong air-tight end closure seams and to provide means for retaining the pleated portions of the bags in position in the region of the end closures.

It is another object of the present invention to provide strong air-tight end closure constructions in a vacuum cleaner bag or the like in which adhesive material securing the tape in 'position is also'utilized to provide a plurality of rivet-like closures lengthwise of the transverse edges of the bag, and particularly in the region -of the pleated portions.

Other and further objects and advantages of the present invention will become readily apparent to one skilled in the art from a consideration of the following specifications taken in connection with the appended drawings.

In the drawing which illustrates the best mode presently contemplated for carrying out the invention,

FIGURE 1 is a more or less schematic representation of a method for providing vacuum cleaner bags pursuant to the present invention;

FIGURE 2 is an end view on an enlarged scale of a blank from which the vacuum cleaner bag is formed, the blank being shown in an intermediate expanded condition thereof for clarity of illustration of the pleated structure;

FIGURE 3 is a sectional view on an enlarged scale taken on the line 3-3 of FIGURE l;

FIGURE 4 is a fragmentary view of a vacuum cleaner bag partly broken away and illustrating the condition thereof during various different steps in the manufacture thereof;

FIGURE 5 is a sectional view on an enlarged scale taken on the line 5-5 of FIGURE 4;

' I2 `adjacent each of the open endsV thereof.

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FIGURE 6 is a sectional view on an enlarged scale taken on the line 6 6 of FIGURE 4;

FIGURE 7 is a top plan view of the vacuum cleaner bag pursuant to the present invention;

FIGURE 8 illustrates a blank from which the vacuum cleaner bag illustrated in FIGURE 7 is formed, partially expanded for purposes of more clearly showing the pleated structure; and

FIGURE 9 is a view similar to FIGURE 1 and illustrates another embodiment of the method for forming the vacuum cleaner bags of the present invention.

The vacuum cleaner bags 10 illustrated in FIGURE 7 are made by forming an open ended tubular bag blank l2, as best shown in FIGURES 2 and 8, which is provided with a collar 14. The blank 12 is formed with pleats 2t) and 22 as a bellows-pinched tube on a conventional bellows-pinched machine, the latter being no part of the present invention. The blank 12 is provided with opposing upper and lower walls 16 and 13 respectively which are inter-connected by pleated side walls 2li and 22. The upper wall I6 is provided with a central aperture 24 about which the collar 14 is suitably secured, as by a suitable adhesive. The blank 12 is open at the opposite ends thereof and pursuant to the present invention the ends are closed by strong air-tight end closures in a relatively simple and inexpensive manner.

FIGURE l illustrates the method or" providing the blanks 12 with strong air-tight end closures. The blanks 12 are carried or moved in any suitable manner or by any suitable means in the direction of the -arrow Z6 so as to subject the blanks to the action of a suitable punching device or die 28. The punching die 28, as here shown, is constituted by a die plate 3u which is mounted on a ram or similar member 32 for vertical .reciprocation as indicated by the arrows 34. The die plate 30 is provided on its lower surface with two laterally-spaced rows of punch elements 36.

the underlying blank 12, the punch elements 36 will form a series of -holes `or apertures 3S in the underlying blank As best shown in FIGURE 2, the holes 3S in the upper wall 16 of the blank 12 will be in registry with similar holes defined in the underlying Wall I8. It should be noted that the blank shown in FIGURE 2 has been somewhat expanded to more clearly show the pleats and that as said blank is processed the pleats and upper and lower Wall are all in surface contact with each other. Moreover,

the end holes 38A in each line of holes or apertures formed in both the upper and lower walls of the blank will extend through the individual pleats 4d defined in each of the side walls 2d and 22 of the blank, it being noted that the end holes 38A in the upper and lower walls are in registry with the holes dened in the pleats 4?.

The blanks 12 provided iwith the holes or apertures 3S are carried to a succeeding position at which a suitable 'adhesive is applied thereto. best shown in FIGURE l, provision is made for a pau' of adhesive applicators 42 which are disposed so as to apply a strip 44 of a suitable adhesive both to the upper wall 16 and the lower wall I8 of each blank 12 along each row of apertures 38 defined therein. The adhesive is advantageously of the hot melt type and the applicators include suitable heating mean-s. As best shown in FIG- URE 4, it will be understood that each stripe 44 of adhesive extends along and inwardly of the adjacent marginal edge 46 of each of the upper and lower walls of the blank 12 so ras to permit for the adhesive to flow into the apertures or the holes 3S and also to deline an adhesive band which extends transversely of the blank l2 at each marginal end thereof so as in eiect to provide for the formation of four stripes of adhesive 44 there being two It will be understood that when the oper-v ating or actuating rain 32 moves the die plate 30 towardV More specifically, and as.

stripes of adhesive on the upper Wall 16 and two stripes of adhesive on the lower wall 1S each stripe extending along the adjacent marginal edge 46 of the associated wall. It is preferred that the adhesive span the hole and coalesce with the adhesive supplied from the opposing side of the blank. The blanks 12 are then passed through a pair of opposing tape folding devices 43 as best shown in FIGURE 3.` In each .folding device 48 the open end of each blank is enfolded in a tape Vweb Sti whichpcornes Vofi or extends from a tape supply roll 52.. Suitable guides 54 are provided for properly feeding the tape from the roll 52 to the associated folder 48. As best seen in FIG- URE 4, it will be noted that theV folded tape 50 completely enfolds each end of the blank 12 and overlies the adjacent adhesive stripe 44 on each surface of the adjacent portion of the opposite walls of the blank. As each blank leaves the associ-ated or companion folders 48, the tape is cut between the blank which has just received thetape and the next succeeding blank so as to provide for the separation of successive blanks. It will be understood that any suitable means may be provided for this purpose. The blarlts then pass through pairs of compression rollers S6 it being noted that the tape along each transverse marginal edge of the blank is subjected to the action of oneY pair of the compression'rollers as best shown in FiG- URE 1. The compression rollers force the tape against the underlying adhesive stripe so as to provide for a good desired bonding action between the tape and the adhesive stripe. Moreover, the rollers force the tape into the apertures 38 as best shown in FIGURES 5 and 6. FIGURE 6k is a section taken through the end holes 33A in each of a pair of opposing rows of holes 3S, the end holes 38A being in registry with holes 38B which have been formed in the pleats 40 as best shown in FIGURE 2. It will be noted from FIGURE 6 that the action of the rollers 56 is to force the adhesive V44 from the outer surfaces of the opposing walls 16 and 17 into theholes 38A and the intermediate holes 38B and also to force the overlying portions of tape Si) into the holes so as to effectively provide a bond or'rivet 58 `formed by the opposing portions 50A of the tape 56 and the intermediate adhesive 44. This ltape adhesive rivet has the highly desirable eiiect of preventing the pleats 449 from being pulled out or being expanded from between the upper and lower walls 16 and 1S at the ends of such walls yor at the four corners of the resulting bag 10. A similar tape adhesive rivet 60 is formed at each pair of opposing holes 3S inwardly of the end hole 38A as best shown in FIGURE 5. Consequently, it will be apparent that each of the originally opened ends of each blank 12 is now provided with a strong air-tight end closure 62 which is formed by a series of taped adhesive rivets which extend transversely of eachvof the original end openings and by the adhesive stripes 44 along each surfacek of theupper and lower walls at the Vadjacent marginal ends thereof enclosed by the folded tape web 50. Consequently, it will -be apparent that there has -been provided an end closure 62 which is highly eliicient and relatively inexpensive and which obviates the previously required necessity for wire stapling or providing a stitched seam at each open end of the l.blank 12 as required in the prior art.

It is within the scope of the present invention to provide the end closures 62 by utilizing a tape web which itself is provided with a suitable adhesive rather than by providing for a stripe 44 of adhesive on each outer surface of the upper and lower walls adjacent the open ends of the blank 12 as previously described. More specifically and as best shown in FIGURE 9, after each blank 12 is provided with the rows of apertures 38 provided therein in the previously described manner, the blanks are passed through the tape folders 48 as previously described, the blanks traveling in a direction of the arrow 25. However, in the present embodiment, provision is made for a tape web 64 which is coated on one surface thereof with `a suitable water or heat activated adhesive 66. The tape web 64 is enfolded about the adjacent open end of the blank 12 in the same manner as previously described so as to engage the adhesive coating 66 thereof with the blank. rThereafter the tape 64 is cut from the blank, as previously described and the blank is then subjected to the action of the pressure rollers 56 as previously described. These pressure rollers force the tacky adhesive coating 66 into the lholes 38, 38A`and 4t) in the same manner as previously described to form the taped adhesive rivets 58 and 6? to produce the vacuum cleaner bag 10 provided with the end closures 62 as previously described. It .will be understood that in all respects the end closure 62. provided by the process illustrated in FIGURE 9 isV the same as the end closure 62 provided by the process illustrated in FlGURE 1.

While I have described the presented preferred embodiments of the invention, it will be understood that various changes and modifications may be made therein K without however departing from the spirit and scope of the present invention as defined in the appended claims.

I claim: 1. A bag having opposing upper and lower walls and pleated side Walls extending therebetween to define a bellows tube, apertures being defined in said tu-be at at least one end thereof,V a coating formed of adhesive material t provided at the outer surface of each of said upper and lower walls at said end of said tube, said coatings extending into said apertures so as to fill said apertures with coalesced adhesive material, and a tape folded over said end of said tube and secured thereto by said coatings, said tape extending Yinto said apertures from -both said upper and lower walls and being secured together in spaced relation in said apertures by the adhesive material filling said apertures and interposed between the opposing portions of said 'tape which extend into said apertures and means provided for access into the interior of said bag. 2. A bag as in claim 1, said adhesive material being of the hot melt type. l

3. A bag as in'claim 1, said adhesive material being formed as a coating on one surface of said tape.

References Cited in the file of this patent UNITED STATES PATENTS 2,542,245 Gottesman Feb.-20, 1951 2,660,100 Dayle Nov. 24, 1953 2,865,556 Williams Dec. 23, 1958 2,899,347 Kindseth Aug. 11, 1959 2,955,517 Honsel Oct. 11, 1960 2,968,432 Craighead Jan. 17, 1961 3,029,012 Leslie Apr. 10, 1962 3,038,651 Cloudsley June 12, 1962

Claims (1)

1. A BAG HAVING OPPOSING UPPER AND LOWER WALLS AND PLEATED SIDE WALLS EXTENDING THEREBETWEEN TO DEFINE A BELLOWS TUBE, APERTURES BEING DEFINED IN SAID TUBE AT LEAST ONE END THEREOF, A COATING FORMED OF ADHESIVE MATERIAL PROVIDED AT THE OUTER SURFACE OF EACH OF SAID UPPER AND LOWER WALLS AT SAID END OF SAID TUBE, SAID COATINGS EXTENDING INTO SAID APERTURES SO AS TO FILL SAID APERTURES WITH COALESCED ADHESIVE MATERIAL, AND A TAPE FOLDED OVER SAID END OF SAID TUBE AND SECURED THERETO BY SAID COATINGS, SAID TAPE EXTENDING INTO SAID APERTURES FROM BOTH SAID UPPER AND LOWER WALLS AND BEING SECURED TOGETHER IN SPACED RELATION IN SAID APERTURES BY THE ADHESIVE MATERIAL FILLING SAID APERTURES AND INTERPOSED BETWEEN THE OPPOSING PORTIONS OF SAID TAPE WHICH EXTEND INTO SAID APERTURES AND MEANS PROVIDED FOR ACCESS INTO THE INTERIOR OF SAID BAG.

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