US2193755A - Bag - Google Patents

Description

March 12, 1940. T, M, VERY I 2,193,755

BAG

Filed May 12, 1938 2 Sheets-Sheet 1 Marh 12, 1940. T M, Avg. j 2,193,755 I BA G Filed May 1'2, 1938 2 Sheets-Sheet 2 Patented Mar. 12, 1940 UNITED STATES PATENT .IOFFlCE BAG True M. Avery, Glens Falls, N. Y., assignor to Union Bag & Paper Corporation, Hudson Falls, N. Y., a corporation of New Jersey Application May 12,

1 Claim.

bottom is closed by flaps formed by folding in-- wardly .the edges and then folding and pasting portions of the sides of the bag onto. the first folding flaps.

In making bags of this type, it has been the common practice heretofore to form slits in the side portions of the bag which are to constitute the bottom closing flaps to afford increased areas II for the pasting of these flaps down upon the previously folded flaps, but such slitting of the bag presents thedisadvantages that the flaps have a tendency to tear beyond the slits when the'end of the bag tube is opened during the process of forming the bag bottom, andin the finished bag, the weight of the material therein often causes the bottom flaps to tear beyond the slits, resulting in leakage of the contents of the The primary object of the present invention is to provide a novel and improved bag, which avoids such disadvantages, it providing a bag the bottom closing flaps of which are provided with tabs-or ears which project therefrom and afford increased or supplemental areas f01 the pasting and securing of such flaps to the pre-' viously folded botto'm flaps, thereby serving to distribute the load of the contents of the bag over .a larger area of the bottom thereof and thus-strengthening and avoiding tearing of the bag bottom, and these tabs or ears, which are formed prior to the folding of the, bottom flaps,

avoid any tendency of the flap forming portions:

of. the bag .to tear during the bottom forming operation, as occurs when the flap forming portions are-slitted, as heretofore. f These features of the present invention are particularly advantageous when the bags are made of "Cellophane or similar material which,

5 as well known, will tear very easily from a slit made therein, but which tearing is avoidedby the present; invention which obviates the necesf sity of employing slits such as those heretofore used generally in bags of the satchel bottom soty i the accompanying drawings: mg. .1 is a view of a strip of material from which the improved bag maybe formed;

m. an a view similar to Fig. 1 butshowing 1938, Serial No. 207,620 7 Fig. 3 shows the strip completely folded to form a bag tube;.

Fig. 4 shows a bag length cut from the bag tube;

Fi 5 after the same has edges inwardly and thus tom closing flaps;

Fig. -6 is 'a view similar to Fig. 5 but showing shows an end of the tubular bag length 5 been opened to fold the side form two of the hotthe closing flap at one side of the bag folded 10.

onto the previously folded bottom flaps;

Fig. 'l is a view of the completed bag, partly in section and partly broken away, the closing flap at the other side of the bag'being shown folded and pasted onto the previously folded 15 flaps;

Fig. 8 is a detail section taken on the line 8-4 in Fig. 5;

Fig. 9 is a detail section taken on the line 9-9 in Fig. 6; and I Fig. 10 is' a det Ili-Hi in Fig. '7. r

The present invention is applicable generally to bags having either a single wall or thickness.

ail section taken on the line or two or more walls or thicknesses, it being shown for example in the present instance as appliedto a bag of the so-called duplex 'type having two walls or thicknesses.

In carrying out the invention as shown in the present instance, the bags may be formed from 30 a strip composed of two sheets or webs I and 2 of paper, Cellophane or other suitable flexible material which are placed one upon the other in offset or staggered relation as shown in Fig. 1. Before superposing the sheets transverse rows spots of adhesive! and 4 are applied to one of the sheets adjacent to the lines, indicated at 5, on which the'bag' tube is to be severed in forming the bag lengths; these spots of adhesive serving to unite the sheets in the regions of the finished 40 bag bottom and the bag mouth. Each section of the strip is formed, adjacent to the line of severance 5, with a pair of tabs or cars 6 which are preferably'semi-circular in form and may be produced. by punching semi-circular cuts through those portions of both of the sheets which adjoin the portions thereof which are to form the final bottom closing flap, the bases of these;

semi-circular tabs or ears lying on divergent folded marginal edges lines I which represent the of the final bottom closing flap. The paste spots 3 are solocated that certain of these paste spots will lie at the bases of these tabs or; ears and will thereby secure together the tabs 01* ears on the two sheets. Thebag strip, whilein-i'iat or i 'web form, may also be punched with holes 8 which extend through both sheets and extend to opposite sides of the lines on which the bag tube is severed, a portion of each of these holes forming a thumb hole 9 at the mouth of the bag,

. and the other portion of each of these holes forming a cutaway portion ID on one of the bottom closing flaps.

The bags may be made rapidly on a bag machine of conventional form having a former to which the bag strip is fed, and having folders for folding the longitudinal edges of the strip inwardly on the line H as shown in Fig. 2 and for folding the opposite longitudinal margin of the strip inwardly on the line |2 to bring lines of adhesive 3 and I4, previously applied to the sheets and 2, onto the inwardly folded portions along the opposite margin of the strip, thus forming the strip into a bag tube as shown in Fig. 3, the lines of adhesive I3 and I4 forming the longitudinal seams of the bag. The bag tube thus formed is then severed, on the lines 5, to form a bag section as shown in Fig. 4.

The end of each bag'length which is to constitute the bottom of the bag is then opened into the form of a diamond fold, which may be accomplished by the well known bottoming mechanism of a bag machine of conventional type. This diamond fold is formed by pulling the side of the bag-provided with the cutaway portion ID and folding it against the body of the bag along the fold line IS, in consequence of which the edge portions of the bag are drawn inwardly to form the bottom flaps Hi. The drawing inwardly of the flaps l6 forms diagonal fold lines 1 between them and the opposite sides of the bag, and sincethe fold lines I extend across the bases of the tabs or cars 6 which are cut from those portions of the bag strip which form the flaps IS, the tabs or ears 6 will remain unfolded and will project beyond the fold lines I, as shown in Fig. 5.

The portion of the bag bottom provided with the cutaway portion I0 is then supplied with spots of adhesive l8, and a spot of adhesive I8 is applied through the cutaway portion I0 to this portion of the bag bottom, and spots of adhesive 2| are applied to the tabs or ears 6 and a spot of adhesive 2| is applied between the inner edges of the infolded flaps Hi to the outerportion of the closing flap 22. The extremity of the portion of the bag bottom having the cutaway portion is then folded on the fold line H! to form a bottom closing flap 20 which is pasted onto the flaps |6, as shown in Fig. 6, after which flap 22 is folded on the-fold line 23 onto the previously folded flaps I6 and 20 as shown in Fig. 7, so that the tabs or ears 6 which over lie portions of the flaps I6 and the flap 2|! as well as the closing flap 22 will be securely pasted to the underlying previously folded flaps by the paste spots 2| and 2| thus completing the bag bottom. By applying a spot of paste l8 through the cutaway portion Ill onto the portion of the flap 20 which is exposed through this cutaway portion, the outer portion of this flap is securely pasted to the underlying flaps IS.

The tabs or cars 6 provided on the bottom closing flap, when supplied with the paste spots 2| and pressed against the underlying or previously folded flaps I6, securely seal or securethe outer portion of the flap 22 to the flaps l6 and the spot of paste 2| applied to the flap 22 near portion of this flap to the previously folded flap 20.

In applying the invention to a duplex bag, as shown in the present instance, the paste spot I8 applied through the cutaway portion ID to the outer portionof the flap 20 will secure both outer plies of this flap to the flaps I6 since the outermost ply of the flap 20 is secured to the adjacent inner ply thereof by the paste spots 3, and the paste spots. 2| I and 2| applied respectively to the tabs or ears 6 and to the outer portion of the flap lying between the inner edges of the flaps IE will secure both outer plies of the flap 22 to the flaps I6 and 20 respectively, since the outermost ply of the flap 22 is secured to the adjacent inner ply thereof by the paste spots 3.

While the invention is shown applied to a bag of the duplex type comprising inner and outer walls or plies, obviously the invention is equally applicable to bags having a single wall or ply which can be made by the same method hereinbefore described but from a single sheet instead of two sheets, in which event the paste spot l8 applied through the cutaway portionlfl to the flap 20 will directly seal or secure the outer wall or ply of this flap to the flaps l6, and the paste spots 2| and 2| 3 applied respectively to the tabs or ears 6 and between the inner edges of the flaps IE to the outer portion of the flap 22 will directly seal orsecure the outer wall of the flap 22 to the flaps l6 and 20 respectively.

Although the paste spots 2| applied to the tabs and the paste spots 3 between the sheets adjacent to the bases of the tabs in a duplex" bag are preferably relatively small as shown, these paste spots will spread, when pressure is applied incident to the pasting together of the bottom flaps, sufficiently to cover ample areas of the tabs to firmly secure them, thereby avoiding objectionable squeezing of excess paste from between the flaps.

By providing the tabs or ears 6 on the bottom closing flap 22, this flap is secured over a larger extent of its area to the previously folded flaps than heretofore, thereby strengthening the bag bottom and distributing the stress of the load in the bag over a larger area of the bag bottom, thus enabling the bag bottom to effectively withstand any tendency to tear under the load, as in bags of the "satchel bottom type having slits in their bottom flaps.

Moreover, by employing these tabs or ears instead of slits as heretofore employed, the stress applied in opening the bottom of the bag into a diamond fold during the bottom forming operation will not tear the bag bottom, as frequently occurs in themanufacture of bags of the satchel bottom type having slitted bottom closing flaps.

Bags according to the present invention may be manufactured on bag machines of conven tional and well known form economically and with the same speed and facility as ordinary bags.

The method of making the bag is claimed in my divisional application Serial No. 235,073 filed October 14, 1938.

I claim as my invention:

A bag having pairs of bottom flaps one pair of which are folded inwardly from the edges of the bag and another pair of which are folded inwardly from the'sides of the bag onto the first mentioned pair of flaps and one upon the other, the flaps folded from the sides of the bag comprising inner and outer plies connected to one another by diagonal fold lines, the inner flap folded from one side of the bag having its inner portion notched to expose its outer portion which is secured to the flaps folded inwardly from the edges of the bag by a spot of adhesive located centrally of the width of the bag bottom, and the outer flap folded from the other side of the bag having tabs which arecut from. its inner ply and project in unfolded relation from the diagonal fold lines connecting its plies, said tabs being secured to underlying flaps by spots of adhesive which are located at opposite sides of the cen-' trally located spot of adhesive securing the inner flap, the inner ply of the outer flap having a gap therein which exposes a portion of the outerply of said flap, and said exposed portion of the outer ply of the outer flap having a spot of adhesive applied thereto which secures it to the inner flap. g

. TRUE M. AVERY.

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