US1870672A - Bag - Google Patents

Description

1932- J. E. CORNELL 1,870,672

BAG

Filed Sept. 12. 1927 2 Sheets-Sheet l Aug. 9, 1932. J. E. CORNELL BAG Filed Sept. 12. 1927 g Sheets-Sheet 2 Patented Aug. 9, 1932.

UNITED STATES PATENT OFFICE JOHN E. CORNELL, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO CORNELL BAG CORPORATION, A CORPORATION 01 DELAWARE BAG Application filed September 12, 1927. Serial No. 218,969.

My invention relates to bags and more particularly to bags of the type having walls made up of a plurality of plies or thicknesses of stock material, such as paper, formed by.

5 wrapping a continuous strip in convolutions in the machine direction of the paper web.

One of the objects of my invention is to provide a bag having greater strength throughout the body of the bag than has been heretofore possible with the given quantity of materials.

Another object of my invention is to provide a bag, such as of paper, having walls comprising a plurality of plies made from a .15 single convolute strip stock with folded satchel bottom and top portions.

A further object of my invention is to provide a bag of the above described type having either an open mouth or a closed mouth with a valve filling opening.

It is also an object of my invention to provide a bag made by winding strip stock in convolutions in which a plurality of strips are employed in different widths, so that the body of the bag will have a greater number of plies than the end portions to avoid any undue bulkiness at the ends where the satchel bottoms are folded.

A further object of my invention is to provide a cylinder from which bags of the above described type are made from a single convolute strip of material preferably wound in the machine direction of the paper web, in which the outer end is secured to the adjacent convolution and the marginal edges of the convolutions are secured together and the inner ends of which may be secured or not, as desired.

It is also an object of my invention to provide a bag possessing the features described in the abovestated objects in which the intermediateportions of adjacent convolutions are in free sliding contact whereby the convolutions will be free to expand throughout their central portions to permit a uniform application of the stresses occasioned when the bag is filled or being filled with the substance which it is to contain. These and other advantages are accomplished by means of the ure 1 and looking in the direction ofthe arrows; and

Figure 4 is a perspective view showing a. completed bag. I

Figure 5 is a side elevation of the tube from which my bags are made, the dotted lines showing the location of the folds for forming the satchel ends.

Figure 6 is an elevation in cross section showing the completed bag with the valve filling opening at the top.

Figure 7 is a cross sectional view of Figure 6, taken on the line 7-7, looking in the direction of the arrows.

Figure 8 is a view similar to Figure 6 of a modified form of bag made with an open mouth. Figure 9 is a detail elevational view in cross section of a modified form of bag in which the body portion comprises a greater number of plies than the end, top and bottom forming, portions; and

Figure 10 is a fragmentary view in cross section disclosing one corner of a bag constructed in accordance with the disclosure in Figure 9. j i

The various novel features of the invention will be apparent from the following description and will be particularly pointed out in the appended claim.

Referring to the drawings, it will be noted in Figures 1 and 3 that my invention contemplates, first, the construction of a tube 10 made up by wrapping a strip of stock 11, such as paper, in convolutions, adjacent convolutions being in contact, and by securing the inner and outerends 14 and 14, respectively, of the convolute strip to adjacent portions of the wall in contact therewith, as by adhesive 15.

It has been found in forming bagsof this generalcharacter to'be highly desirable to provide a maximum of strength in the central portion of the bag and to so wrap the stock that the maximum of strength will run circumferential of the ha in a manner to resist expansion and burst ng along the side wall portions.- .In packing cement this is particularly important for the reason that cement and other finely divided powdered substances have the peculiar property, upon being dropped to the ground in use, of being compressed by the impact, due to the nature of the substance itself to the extent of form-,

longitudinaldisposition of thefibers in theweb, will be provided in a manner to resist the bursting action above referred to.

' My invention also contemplates the provision of adhesive on the upper and lower marginal edges of the tube, as shown at 12, so that the tube in effect is formed with a single ply ed e which is more readily adapted to the su sequent folding and securing operations for forming the satchel ends.

I also provide in the tube a notch 13, which may be-cut into the edge thereof, either prior to the wrapping operation, durin the wrapping operation, or subsequent t means for providing this notch being suitable, it merely being necessary to rovide some means whereby gripping mec anism may engage one edge of the tube to sefilparate the opposite sides in presenting the attened tube to mechanism for forming the satchel ends. I desire to provide one notch at each end, which may be on the same side of the cylinder, or onopposite sides, and

of forming open. mouthed bags, but that it is to be understood t at tubes may be provided wlth one notch only as in the case open mouthed bags may likewise be notched at the open ends in order to facilitate the bag being readily opened when manually handled by the person filling the bag.

The modified form ofmy invention, shown inFigui'e 2, has its inner end, 16, left unsecured and in this respect difl'ers from the form shown in Figure 1, the outer end 17 bein secured as by means of adhesive 18 to the ad acent portion of the side wall in the same manner as the outer end shown in Figure 1. By leavin the inner end free the convolute 'mentalities is caused to ereto, any

them in the form shown in Figure 5 to the mechanism forming the satchel ends at the top and bottom. By means of grippin fingers engaging the wall portions throng the notches 13,. provided at the upper and lower edges of the bag, the opposite wall portions are separated and the bag by suitable instrudotted lines 24 with the overlapping ortions secured by adhesive in a manner to orm the closed satchel ends 25 and 26 at the top and bottom, respectivel as shown in Figures 4, 6 and 7. It is pre erred in this type of bag to leave one end of the top unsecured, as shown in Figure 6, whereby a valve filling opening 27 is provided, of the type now in use and familiar to those skilled in the art.

It is also within the scope of my invention to provide an open mouth bag of the type shown in Figure 8, which may or may not have a notch provided at the open end of the tube constituting the ba structure.

Referrin now particu arly to Fi res 9 and 10, it Wlll be noted that my inventlon contemplates a modified form of bag having a wall constructed of a plurality of plies, the end portions of which are formed from extensions 22 of a part only of the plies constituting the main wall of the bag.

It has been found from experience that the satchel ends constituting the tops and bottoms of bags of this general character, due to the fact that they are folded over in overlapping relationship and secured with adhesive, are stronger than is necessary to support e folded along the the load of the contained material. In view of this excess strength, a large quantity of -material, which involved undue waste and to form the convolute tube that the narrow strip is positioned between adjacent wide strips 20. The ends 22 of the wide strips extend beyond the ends of the strips 21 and are secured together by means of adhesive 23, so as to form end portions from which the satchel'ends are formed, having a reduced number of plies as compared with the number of plies constituting the main body portion of the bag. The manner of forming the satchel end is shown in Figure 10, where the extensions 22 of the plies 20 are secured together and are folded over to-form the bottom. Due to the manner of folding, the bottom is of sufiicient strength, independently of the fact that only a reduced number of plies are provided.

In practice it will be found that I have provided a bag of greater strength than has heretofore been realized for the amount of material employed and that I have provided a bag which is very eflicient in operation as well as easy and inexpensive to manufacture. I find that in providing the convolute strip wrapped in the machine direction of the paper that an increased strength is realized, which resists the bursting action and that the provision for the relative slippage between adjacent convolutions that all of. the plies share equally in resisting the spreading load of the bag and contents when in use. At-

tention isalso directed to the provision for the notches 13 and the securing of the mar ginal edges of the tube whereby/the handling of the bag by the satchel end forming mechanism is greatly facilitated. I preferably form my bag with a closed top having a valve filling opening, but it is to be understood that my invention contemplates an open mouth bag of thetype shown in Figure 8.

Attention being directed now particularly to Figures 9 and 10, it will be noted that this form of my invention effects a great saving in material, with a maximum of strength provided in the wall portions of the bag, as well as the end, top and bottom forming portions.

This is accomplished by wrapping an intermediate layer of less width in between the convolutions of greater width, the extended ends of the latter forming the portions from which the top and bottom are formed. All of these features may be practiced according to the modified form in Figure 1 or Figure 2, it being a matter of preference as to whether or not the inner end of the convolute strip is secured.

My invention contemplates in the modified form shown in Figures 9 and 10 the securing of the marginal edges of the narrowstrip to the adjacent contacting portions of the wider strip so that it will be held at the edges against displacement, but so as to permit the central portions to slide freely in contact with the adjacent convolutions.

Attention is directed to the fact that the narrower strip may be located centrally in the dir tion of the width of the wide strip as in bags] having folded tops and bottoms, or may be located along one edge of the wide strip, leaving the extensions of the wide'strip for forming the bottom as in the case of the open mouth bag. In the open mouth bag the narrow reinforcing strips may be flush with the upper edge if desired.

Attention is further directed to the fact that it is not necessary in practicing my invention to have the wide and narrow strips alternately arranged as my invention also contemplates for the provision of aplurality of narrow strips or a plurality of wide strips placed together and subsequently wound in convolutions.

I claim:

A bag having multi-ply side walls, comprising a single strip of paper wrapped in convolutions, the marginal edges of adjacent convolutions being secured together, with intermediate portions of adjacent convolutions in free sliding contact, and means securing the inner edge portion to the next adjacent convolution substantially throughout its len th.

igned at Chicago, Illinois, this 8th day of September, 1927.

JOHN E. CORNELL.

as I

Images