US1949622A - Bag - Google Patents

Description

A. POTDEVIN March 6, 1934.

BAG

Filed June 9, 1931 2 Sheets-Sheet l IN VEN TOR. 4 4 mu;

BY gwf'd a MW A TTORNEYS.

March 6, 1934. A. POTDEVIN 1,949,622

BAG

2 Sheets-Sheet 2 Filed June 9, 1931 INVEN TOR. 44%.: m BY M A TTORNEYS? I Patented Mar. 6, 1934 BAG' Adolphl'otdevin, Garden City, N. Y., assignor to Potdevin Machine Company, Brooklyn, N. Y., a. corporation of New York Application June 9, 1931, Serial No. 543,086

2 Claims.

My invention is directed to an improvement in bags of the muti-wall valve type such as are employed for cement, for instance, in which the bags are closed at both ends and then filled through a so-called valve instead of through an open end of the bag.

'One of the objects of my invention :'s the provision of a bag of the class indicated in which the paper webs constituting the bag walls are cut in a novel manner or shingled so that when they are folded over and pasted the bag will be of increased strength at all seams and at its ends as well as being leak-proof. This is of importance when the bags are to be used for heavy materials such as cement, for example, wh ch is in the form of a dry powder and unless the bag is construc ed in such fashion that the various overlapping portions of the bag are strong and well pasted together leakage will occur.

:0 A further object of my invention is the provision of a bag of the class indicated wherein the valve end is of minimum thickness and maximum fiex'bility whereby filling of the bag through the valve is facilitated. 1

A still further object of my invention resides in the manner of cutting off the bag lengths so that one end of the bag will be complementary to the other whereby paper waste is entirely eliminated.

In the drawings accompanying myapplication;

Fig. 1 is a tube secton cut from the bag material;

Fig.2 is a transverse section through Fig. 1;

Fig. 3 is a plan view of the valve end of the tube after the first folding operation and after adhesive has been applied;

Fig. 4 is a view showing the next step in the folding operation;

Fig. 5 shows the valve end of the tube after the folding operation and sealing have been completed;

Fig. 6 is a transverse sectional view taken through the folded or valve end of the tube;

Fig. 7 is a longitudinal sectional view through the bag showing both ends folded and sealed;

Fig. 8 is a view simlar to Fig. 1 showing a modified form of my invention;

Fig. 9 is a view showing the first step in the folding operation of the bottom of said modified form after the adhesive has been applied;

Fig. 10 is a view of the top or valve end of the modfied form showing the first step in the fold ing and sealing operation;

Fig. 11 is a view showing the final sealing operation of the valve end;

Fig. 12 is a view similar to Figs. 1 and 7 showing another form of my invention;

Fig. 13 is a vLew showing a step in the folding and sealing operation of the bag of Fig. 12; and

Fig. 14 is a longitudinal sectional view of one end of the bag of Fig. 13.

It is to be appreciated that the invention of this application relates to a continuous operation in that the paper is fed into a machine, formed into a tube, the tube severed into bag lengths and 05 each end folded in or bottomed to complete the bag in a manner to be hereinafter described.

Referring to the drawings in detail and first of all to Figs. 1 to 7, inclusive, wherein I have shown a two-ply bag for convenience of illustration, it being understood that any desired number 'of plies may be employed. The outer tube or ply is designated 1, while the inner tube or ply has been designated 2. For clarity of description the upper and lower walls" of tube 1 have 15 been designated 3 and 4, respectively, and the upper and lower walls of tube 2, 5 and 6, respectively.

As the multi-wall tube is advanced continuously the same is severed at intervals to provide sucgo cessive bag lengths. In this severing operation the inner tube 2 is severed straight across for its entire width to provide an even or unbroken edge 8 on wall 5 and the same type of edge 9 on wall 6, while the outer tube 1 is severed to pro- 35 vide a flap 10 on the lower wall 4 and a recess or cutout portion 11 in the upper wall 3. In forming the end of the bag, as above described, it will be appreciated that a recess is provided in the opposing end of the succeeding section of the 9 outer tube 1 corresponding to the flap 10 and a flap on the opposite wall of the same tube corresponding to the recess 11. Opposite ends of any bag length, therefore, are complementary as will be understood. For instance, referring to Fig. 1, it will be seen that the opposite end of the bag from that just referred to will be provided with a flap 12 corresponding to the cutout 11 and with a recess or cutout 13 corresponding to the flap 10.

I wish to emphasize at this point that the manner or mode of cutting the paper so as to form the ends of the bag eliminates paper waste and in addition provides a construction in which thorough pasting of the bag ends is assured as will be brought out hereinafter. This method of cutting or forming the ends of the bag lengths also reduces the thickness of the ends of the bag as compared with prior structures. The elimination of paper waste will of course eliminate the necessity of the provision of means for freeing the 1m machine of waste paper and the advantage of this will be appreciated if it be borne in mind that the paper in actual practice passes through the bag making machine as a continuous tube and at high speed.

After the tube has been cut off as above described the valve end thereof is opened up, the side 14 and valve portion 15 folded in diagonally and the upper wall of the tube folded back upon itself, as illustrated in Fig. 3. The side portion 14 is then coated with adhesive as shown at 16, adhesive also being applied to the face of the lower wall 6 of the inner tube 2 and the face of the tab 10 on the lower wall 4 of the outer tube 1. The folded back portion of the tube is then folded forward, as viewed in Fig. 3, along the broken line 17, as shown in Fig. 4, over the paste 16. The tube is then folded from the position shown in Fig. 4 to the position shown in Fig. 5 along the broken line 18 to bring the posted portion of the wall 6 upon the unpasted portion of the wall 5 of the same tube in the recess or cutout 11, and this same part of the inner tube contact? ing with the upper face 3 of the outer tube 1, so that the lower wall 6 of the inner tube will be sealed to the upper wall of the same tube as well as to the upper wall of the outer tube. In this same continuous operation the flap 10 is brought over into superimposed relation with the upper wall 3 of the outer tube 1 so that we have the end of this tube folded over and sealed down, as illustrated in Fig. 5.

It will be understood that the opposite end of the bag is similarly bottomed except that both turned in portions or corners are pasted and sealed, instead of leaving one unpasted portion such as 15 for a valve.

It will be seen, therefore, that my construction provides a bag in which one wall of the inner tube is pasted or glued directly to the opposite wall of the same tube as well as to the opposite wall of the outer tube and that one wall of the outer tube is pasted or glued to the opposite wall of the outer tube, thereby insuring a thorough sealing of the bag end to prevent leakage and also preventing, due to the shingled effect produced in the cutting off operation or forming of the bag end, a much more flexible end than provided in valve bags as heretofore constructed and wherein the shingled effect is not employed.

Referring to the embodiment of my invention illustrated in Figs. 8, 9, 10 and 11, the tubing from which the bags are to be formed is cut in a manner similar to that described in connection with Fig.1 except in that the lower wall 6 of the inner tube 2 instead of being cut straight across, as in the case of Fig. 1, is provided with a tab 19, while all four walls of the tube are cut 'or slit longitudinally as indicated at 20 a 21 so that in the bottoming of the bags tag side portions 22 and 23 at one end of the bag,v Fig. 9, and valve portions 14 and side portions 15 at the other end -of the bag, Fig. 10, can be folded in a greater distance or depth than with the construction of the bag above described, to provide an increase in the pasting area, as will be appreciated by comparison, for example, of Fig. 3 with Figs. 9, 10 and 13. In all other respects the bag of Figs. 8 to 11 is the same as the bag of Figs. 1 to 'l.

The bag of Figs. 12, 13 and 14 is the same as the bag of Figs. 8 to 11 except that the bag of Figs. 12 to 14 comprises three plies, 24, 25 and 26, instead of the two plies of Figs. 8 to 11, the two plies 24 and 25 of this last form of my invention each being provided with a tab 19', corresponding to the tab 19 of Fig. 8.

I wish it to be understood that the number of plies or thicknesses illustratedandabove described is not to be taken as limiting the scope of my invention, my invention comprehending the use of any number of plies that may be desired but in all cases the overlapping portions or those portions which I have referred to as tabs herein will be cut in step formation, as above described.

It is to be understood also that my invention comprehends employing plies not only of the single thickness which have been illustrated herein but of several thicknesses when desired.

What I claim is:--

1. As an article of manufacture a bag length the walls of which are multi-ply, the plies constituting each wall of the bag length being shingled at each end of the bag length, the shingled formation at one end of the bag length being complementary to the shingled formation at the opposite end of the bag length, the shingled plies of one wall of the bag length extending beyond the shingled plies of the other wall of the bag length at the same end of the bag length.

2. As an article of manufacture a bag the walls of which are multiply, the plies constituting one wall of the bag being shingled intermediate its sides at one end of the bag, the plies in the op-- posite wall of the bag at the same end of the bag being shingled intermediate its sides, and extending beyond the end of the first mentioned wall, both walls of the tube being slitted lengthwise along the sides of the shingling, the opposite corners of both walls of the shingled end of the tube being inturnedalong said slits, and the shingled portion of the longer wall of the tube being folded over to overlap the shingling of the shorter wall to which it is sealed.

ADOLPH POTDEVIN,

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