US1933776A - Multi-ply bag and method of producing same - Google Patents

Description

Nov. 7, 1933.

J. N. TOOKER 1,933,776

MULTI-PLY BAG AND METHOD OF PRODUCING SAME Filed July 29, 1950 2 Sheets-Sheet l INVENTOR ATTORNEYS J. N. TOOKER 1,933,776

Filed July 29, 1930 2 Sheets-Sheet 2 John/1475 BY W; Wag

ATTORNEYS Nov. 7, 1933.

MULTI-PLY BAG AND METHOD OF PRODUCING SAME Patented Nov. 7, lQ33 v untrue stares insane PRilDlUCiING SAME awn rvmrnon or.

John N. 'looher, (Canajoharie, N. lh, assignor to Bartlett rlrlrcll,

Application July 29, i

7 Claims.

My invention relates to multi-ply bags and more especially multi-ply bags for cement and other weighty substances, and further relates to a method of producing such bags.

One of the objects of my invention is to provide a novel and improved bag andmethod of producing the same of the type in which the bag tube is formed by winding a strip of paper or similar material upon itself a plurality of times.

Another of the objects of the present invention is to provide a bag of the character indicated and method of" producing the same in which the several plies are secured together in such a manner as to obtain maximum strength and durability for the amount and quality of the paper or other material used.

Referring to the accompanying drawings:.

Figure l is a plan view of a strip from which the tube of my improved bag may be formed the lines of glue for securing the several plies of the completed bag tube together being indicated by broken lines;

Fig. 2 is a view in perspective of the strip forma bag tube;

Fig. 3 is a'view in perspective of the completed bag tube;

Fig. 4 is a plan view showing satchel bottoms partially formed on the ends of the tube;

Fig. 5 is a similar view showing the satchel ends before the outer flap of the ends are folded over; and

Fig. 6 is a plan view of the completed bag.

My improved bag as illustrated in the drawings is a five-ply paper bag that is particularly adapted for cement and other heavy substances. In forming this bag, a paper strip 2 having the grain of the paper running in the direction of its length, is tightly wound on a suitable mandrel d. Previously to the winding of the strip, however, glue is applied on its inner side ona transverse line 6 spaced from the inner end of the strip; on a transverse line 8 adjacent the outer end of the strip; on spaced lines 10 extending between the lines 6 and 8 and arranged adjacent and parallel to each longitudinal edge of the strip; on equally spaced lines 12 extending from each of the inner lines 10 a distance inwardly; and on spaced lines 1e extending transversely-of the strip.

The several lines of glue are suitably arranged so that when the strip is wound on the mandrel to form the tube, the inner end of the strip is secured to the overlying ply; the outer end of the strip is secured to the underlying ply; the i '69 lines 12 and 14, the corresponding lines 12 and wound upon itseliona cylindrical mandrel to New York, N. l2, 93d. Serial No.d7]l,53ll

14 of the several plies being arranged one over the other. When the strip has thus been wound on the mandrel, the tube is removed from the mandrel and flattened as indicated in Fig. 3, the inner and outer ends of the tube strip being preferably spaceda distance from the longi tudinal edges of the flattened tube as shown. The tube is so fiattenedand the glue lines i i are so arranged, that said lines 14 of the several plies are spaced in proximity to the longitudinal edges or the tube. Ina flattened bag tube ap--. proximately thirty inches long by eighteen inches wide which is a standard size for cement bags, the lines l-i are preferably spaced substantially two inches from the longitudinal edges of the tube. If desired the strips i i may be omitted from between the two outer plies oi the bag tube so that they will not show on the outer surface of the completed bag. No glue need be applied on the intner end portion of the strip beyond the glue line 8.

After the bagtube has been thus formed and flattened, and preferably before the glue has become thoroughly dried, the ends of the tube may be closed by means or" a suitable bottom= ing machine to iorm a satchel bottom on each end of the tube, with or without the usual valve. In forming a satchel bottom, the tube is slit at each end at 1'6 and the end pieces 18 are bent inwardly which forms projecting transverse flaps 20. One of these flaps 2c is bent over as shown in Fig; 5, and then the other flap is bent over thereupon as shown in Fig. 6 to form the completed bag tube, the glue-being applied in the usual manner to the flaps so as to secure them together and to the ii-shaped end pieces 18. The several glue lines ill of the several plies, of. each flap 2c are so positioned that the superposed outer glue lines 10 which secure together the plies of the outer flap are positioned over the inner glue lines 10 which secure together the pliesbf the inner flap, and the inner glue lines 10 of the outer flap are positioned over the outer glue lines 10 of the inner flap. By this method whereby the plies of the two flaps are secured together on superposed lines, the glue which is applied during the bottom forming operation to secure the two flaps together, insures that the five plies of one flap are secured to the five plies of the other flap, thus resulting in maximum; strength of the satchel ends. 4

Also, by spacing the two narrow glue lines 10 apart, as shown, these glue lines do not add materially to the stiffness of the closed ends and it has been found that said ends may be subjected to the usual flexing strains during also have a tenderfcy to break or burst adjacent the transverse crease or fold in one side of the bag tube which substantially defines the inner extremity of the satchel end. In the present construction this tendency has been overcome by the bars or lines of glue 12 which extend from the flaps 20 inwardly an appreciable distance, and thus greatly reinforces the bag at the desired points. The lines of glue 14 spaced from the longitudi nal edges or creases of the bag have been found to add greatly to-the strength of the bag; In

secured to the underlying ply of the glue and the several plies secured together at the ends of the tube by said longitudinally extending lines of glue, flattening the tube thus formed, and forming a satchel bottom on one end of the tube so as to cause the overlying transverse flaps of the satchel bottom to be positioned with-the two lines of glue securing together the plies of the outer flap overlying the corresponding lines of glue securing the plies of the inner flap.

- 3. The method of forming a bag from a strip which comprises applying glue-t0 one. side of the strip along its longitudinal edges, across one hand in fi d a s' m t r other w i ty end and in short transverse bar's extending a 90 material, it is customary for the workman to grab the bag at the ,ends, with, the result that great strain is placed on the longitudinal edge portions of the bag?" Such strain has. a tendency to tear the bag adjacent the longitudinal edges, and such tear if unobstructed soon works completely across the bag. By arranging the lines of glue 14 in proximity to' these longitudinal edges, where the tear usually takes place, they not only assist in reinforcing the edge portions materially, but also if a tear should start in the longitudinal edges it ordinarily would. only creep up to the lines of glue, and thus no substantial quantity of cement would spill out.

The several glue lines 10, 12 and 14 are preferably of narrow width, approximately onequarter of an inch in width, and with respect to the lines of of glue 14 they should be of still narrower width and in fact of quite as narrow width as it is possible to apply economically. By making these several strips of narrow width, they reinforcethe plies of the bag at the necessary points without adding materially to the stiffness of the material of the bag, any stiffness having a tendency to weaken the bag and thus causing it to easily break while subjected to frequent bending strains during handling.

In case a valve is formed in one of the satchel ends, the glue is preferably omitted between tl: a

without departing from the spirit thereof or the scope of the appended claims.

What I claim is: V

l. The method of forming a bag from a strip which comprises applying glue to the strip along its longitudinal edges, across one end, and on a plurality of spaced trans /erse lines, winding the strip with the glue thus applied upon itself a plurality of times so as to form a bag tube with said end of the strip outermost and secured to the underlying ply by said glue thereon, and

6% the several plies secured together at the ends of the tube by said glue applied to said longitudinal edges of the strip, and the plies secured together longitudinally of the tube by said transself a plurality of times so as to form a bag tube with said end of the. strip outermost and distance inwardly from a line adjacent to each of its longitudinal edges, winding the strip upon itself a. plurality of times so as to form a bag tube with said end of the strip outermost and secured to the underlying ply by said glue onsaid end, and with the several plies secured together at the ends of the tube by said glue applied adjacent said longitudinal edges of the strip, and also by said transverse bars of glue, the corresponding bars of glue of the several plies being arranged in superposed relation, and forming a satchel bottom on the ends of the tube with said bars on each end of the tube extending across the creases that define the outer edges of the satchel bottoms.

4. In a bag of the type comprising a strip wound upon itself a plurality of times to form a tube with the ends of the tube closed and the tube flattened longitudinally, the improvement which comprises glue appliedso as to secure the several plies together on lines extending longitudinally of the tube and arranged. in proximity and parallel to opposite sides of the longitudinal edges of the flattened tube. v

5. In a bag of the type comprising a strip wound upon itself a plurality of times to form satchel ends and the tube flattened longitudi-' nally, the improvement which comprises glue applied between the plies so as to secure the plies together in a plurality of spaced bars extending a short distance inwardly from the closed ends of the tube and across the creases that define the outer edges of the satchel'bot- 1'25 toms.

6. In a bag of the type comprising astrip wound upon itself a plurality of times to form i a tube with the ends of the tube closed by a "tube with the ends of the tube closed by means of a satchel bottom,-the improvement which comprises glue applied between the plies of the transverse flaps of each satchel bottom on a plurality of lines extending longitudinally of the flaps with the lines of glue securing the plies of one flap overlying the lines of glue of the other flap,

7. ma bag of the type wo'und upon itself a plurality of times to form a tube with the ends of the tube closed by satchel ends, and the tube flattened longitudinally, the improvement which comprises glue 'applied be-, tween the plies so as to secure the plies together in a plurality of spaced bars extending a distance-inwardly from the closed ends of the tube, and theseveral plies together on lines extending longitudinally of the tube and arranged in proximity and parallel to opposite sides of the longitudinal edges of the flattened tube, the several plies between said closed ends being 1e substantially otherwise unsecured. JOHN N. TOQKER.

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