US2635803A - Valve bag - Google Patents

Description

April 21, 1953 c. H. HARTMAN VALVE BAG 2 SHEETSSHEET 1 Filed May 2, 1950 INVENTOR. CARL H.HARTMAN.

ATTORNEYS.

April 21, 1953 c. H. HARTMAN VALVE BAG 2 SHEETSSHEET 2 Filed May 2, 1950 l a i l \1 l INVENTOR. CARI- HlflAfiTMAN- 4; A TTORWEKS.

Patented Apr. 21, 1953 UNITED STATES PATENT orrlicsi VALVE BA'G Carl H. Hartman, New Rochelle, N.Y., assig'nor to St. Regis Paper Company, N ew. York, N. Y., a corporation of New York Applic'ation'May 2, 1950, Serial No. 159,460

4:01aims. 1

This invention relates to valve bags and more particularly to bags of that type having valve sleeve means protruding from the valve corner and adapted to be folded and tucked in after the bag is filled.

While known forms of valve bags of the socalled tuck-in sleeve type above referred to have been widely and successfully used for the packing of various commodities, yet for certain very fine or dusty materials, there has been found to be some tendency for small amounts of the materials to sift out through the tuck-in valve sleeve or be blown out, due to the bellows action of the bag when it isbeinghandled or shipped. While such losses of material through tuck-in sleeve valves are ordinarily so small as to be unimportant, yet with certain chemicals or colored materials, for example, such as fine pigments or the like, it becomes desirable to substantially wholly preclude the possibility of any of the material sifting or blowing out through the valve and to insure that the valve sleeve will be in effect doubly sealed against such losses, so that even small amounts of the, material will not escapeand disfigure the desired clean external appearance of the bag or discolor other articles or commodities which may happen to be nearby during shipment of the bags.

The present invention provides a simple, inexpensive and easily manufactured tuck-in type valve sleeve arrangement which is effective in eliminating all noticeable sifting or blowing out of fine powdery or colored materials at the valve corner. In accordance with theinvention, a double tuck-in type valve sleeve is provided, preferably, although not necessarily, by utilizing a single supplemental sheet which is so folded over as to form an inner sleeve wall and an outer sleeve wall, and preferably also a sleeve cuff to embrace the inner edge of the usual valve flap which is turned inwardly of the bag at the valve corner. The inner sleeve wall preferably protrudes further than the outer sleeve wall so that it may be readily and quickly grasped, then folded over and tucked in at least part way. Thegenerally shorter outer sleeve wall is so shaped at its end edges that same may then be readily folded over the tucked-in inner sleeve and finally both the inner and outer sleeve walls as thus folded are further tucked in to the valve corner, whereby provision is made for a plurality of tight sleeve folds,- one or another of which will block the passage of even the smallest amount of material.

The invention is applicable to bags having one, two or more plies of; paper or other flexible or pliable sheet material, including. if desired, a ply or lining of polyethylene or other thermoplastic material, and while the invention will be illus-' trated in connection with a multi-wall paper bag having its ends closed by a sewn seam, it will be understood that certain features of the invention will also be adapted for use with valve bags of the pasted end-type.

Further and more specificobjects, features and advantages of the invention hereof will appear from the detailed description given below, taken in connection with the accompanying drawings which form a part of this specification and illustrate by way of example a prefeiredxembodiment of the invention.

In the drawings:

Fig. 1(a) is a perspective view of the corner of a 'multi-wall paper bag, the corner being inturned for forming a valve of conventional construction and of a type suitable for the application of the novel sleeve of the present invention;

Fig. 102) is a view showing the preferred form of double walled sleeve embodying the invention, before it is applied to the valve corner of a bag;

Fig. 2 is a view showing the outline of a supplemental sheet in flat condition adapted to be formed into a sleeve according to the invention;

Fig. 3 is a top view of the corner of a bag such as shown in Fig. 1(a) but with the corner spread apart and with the supplemental sheet inserted in position underneath thevalve flap, this supplemental sheet having been folded over before insertion and being ready to be folded outwardly about the edge of the valve flap;

Fig. 4 is a side view of the construction of Fig.3 after the double walled sleeve area has been folded outwardly and the valve corner collapsed;

Fig. its a view similar to Fig. 4, but showing a corner of the finished sleeved valved bag with an end closure tape sewn in place; and

Figs. 6 and 7 show how the novel sleeve'is to be tucked in.

Referring now to Fig. 1 (a), there is here shown a conventional form of valve corner of a multiwall bag having opposed side walls as at I0, Ill and a valve flap l I which has been turned inwardly about diagonal fold lines l2, l2. The particular bag-here shown is of the type having gussets at its sides as at [3, although it will be understood that the invention is applicable to socalled "flat or non-gusseted bags, if desired.

Referring to Fig. 1(b), the double walled sleeve is here shown as having an inner wall constituted of opposed areas l4, 14', preferably of creped paper, and outer walls I15, 15 made integral with the inner walls by reason of. the folded-over cuff construction as indicated at [6.

3 The double walled sleeve, as shown in Fig. 1(b) may, is desired, be inserted in a valve corner, such as in Fig. 1(a), after the sleeve has been folded to the shape here shown, and by hooking the cup portion l6 over the inwardly directed valve flap edge l1. However, usually the sleeve will be formed and inserted in the manner hereinafter described. That is, first numerous supplemental sheets are cut out according to the outline shown in Fig. 2 and preferably creased along fold lines as at l8, l9 and 20 and also, if desired, along the median line 2|. Such sheets are then folded over along crease line it and the edge of the sleeve which includes this line is then inserted in under the valve flap edge I! in the manner shown in Fig. 3, while the mouth of the valve and the valve corner are 'held in spread apart condition. The overlapping portions of the under ply of the valve flap, and of the supplemental sheet are sealed together as by a line of paste therebetween in the position indicated at H (Fig. 3). Then the inner and outer sleeve walls are both folded over (along fold lines I9,

) and about the inner edge ll of the valve flap,

whereby the cuff portion I6 is completed and the inner and outer sleeve walls protrude upwardly of the valve corner. Thereupon the spread-apart corner of the bag may be collapsed about the median line 2| of'the valve, and the parts will assume the positions shown in Fig. 4. Then the usual form of closure tape 22 may be applied to the end of the bag and secured in the usual way as by a sewn seam 23.

(It will be noted that one of the. side areas, as at M, of the inner sleeve may be cut at its outer end so that it will terminate and provide an outer end edge 24, positioned at a slightly inwardly and upwardly directed angle as compared with the edge of area M. This enables the areas I 3 and i l to be readily separated'by the fingers for insertion of a filling nozzle in the usual way.

'It will further be noted that with the preferred example shown, the upper outer corner portions of the outer'sle'eve wall are cut away along diagonal lines as'at25, 25, which lines are positioned preferably so as to be parallel with the diagonal fold lines I2, l2 of the valve corner, but spaced outwardly therefrom by a sufficient distance to permit the sleeve and parts to be folded and manipulated in the manner hereinafter described. It will further be noted that the lower outer edge portions as at 26 of the outer sleeve wall terminate at a region intermediate between the bag edge and the outer end edge of the inner sleeve wall.

After the bag has been filled and the filling spout is removed, the inner sleeve portion, together with the sewn end closure tape are first folded over and tucked in to the position approximately as shown at 21 in Fig. 6, the outer sleeve Wall remaining for the moment protruding substantially to the position shown at 28. Then the outer lower edge portions of the outer sleeve wall are folded up over the areas at 21 and the whole sleeve assembly is then folded downwardly and inwardly, into the valve with the exposed parts then finally appearing substantially as at 2%) in Fig. 7. 7

It will be apparent that the diagonal cut-off portions at 25, 25' of the outer sleeve wall are such that ready access is had to the inner sleeve. wall for folding its outer corners over and then folding same downwardly and inwardly with a rapid tuck-in movement. sleeve parts will still protrude at the top of the However, the innerbag by a distance indicated at 30 (Fig. 6) sulficiently so that these portions can again be folded in after the outer lower end edge portion of the outer sleeve wall has been folded up onto the areas at 21.

The combination of folds thus made possible has been found to be quite surprisingly effective in eliminating even small amounts of dusting or blowing out of fine particles contained in the bag, and the construction is also well adapted to exclude from the bag troublesome small insect pests, as well as preventing the entrance of moisture, or the escape of moisture in case the commodity to be packed is one which should not be allowed to dry out.

While the invention has been described in detail with respect to a particular preferred example thereof, it will be understood by those skilled in the art, after understanding the invention, that various changes and modifications may be made without departing from the spirit and appended hereto.

What is claimed as new and desired to be secured by Letters Patent is:

I 1. In combination, a bag having its corner portionturned inwardly to form a valve with an inwardly directed valve flap, a double walled tuckin type sleeve secured in said valve, both walls of such sleeve protruding outwardly of the valve corner, the inner sleeve wall protruding further than the outer sleeve wall and upper outer portions of the outer sleeve wall end edge being out ofi to'facilitate ready access to the inner sleeve wall, the outer end of which is shaped and positioned to permit folding same and tucking it into the outer sleeve wall, the remaining outer end edge'portions of the outer sleeve wall protruding far enough to then be folded over the tucked in inner sleeve wall, and both walls protruding far enough from the bag corner to then be again folded under and tucked inwardly of the valve.

2. In combination, a. bag having its corner portion turned inwardly along diagonal fold lines to form a valve with an inwardly directed valve fiap, a double walled tuck-in type sleeve secured;

in said valve, both walls of such sleeve protruding outwardly of the valve corner, the upper portion at least of the inner sleeve wall protruding further than the adjacent portions of the outer sleeve wall and upper outer portions of the outer sleeve wall end edge being out off along diagonal lines spaced outwardly of said first named diago-:

then be again folded under and tucked inwardly of the valve. V

3. In combination, a bag having its corner portion turned inwardly to form a valve with an inwardly directed valve flap, the end of the bag being closed by a sewn seam, a double walled tuck-in type sleeve secured in said valve, both of said sleeve walls being closed along their upper edges by said sewn seam, but the upper portion at least ofthe inner sleeve wall protruding further than the adjacent portions of the outer sleeve wall to facilitate ready access to the outer end of the inner sleeve wall, the outer end of which is shaped and positioned to permit folding thereof downwardly and tucking it part way inwardly of the valve, the remaining outer end edge portions of the outer sleeve wall protruding far enough to then be folded over the tucked in inner sleeve wall, and both walls protruding far enough from the bag corner to then be again folded under and tucked inwardly of the valve.

4. In combination, a bag having a corner portion folded inwardly to form a valve with an inwardly directed valve flap, a supplemental sheet folded over along the median line of the valve and also folded over along a line adjacent the inner edge of said valve flap and transversely of said median line to provide a double walled tuckin type valve sleeve, both walls of which protrude substantially outwardly beyond the bag wall, the inner end portions of said double wall sleeve being again folded over to form a and embracing the inner edge of said valve flap, the upper por- 15 Number tion of the outer end of the outer sleeve wall terminating along a line intermediate the bag wall and the outer end of the inner sleeve wall, the latter being shaped and positioned to permit same to be first grasped and tucked in independently of the outer wall, the protruding outer wall portions being of sufficient length to then be grasped and folded over the tucked in inner wall portions and then be tucked into the bag.

CARL H. HARTMAN.

References Cited in the file of this patent UNITED STATES PATENTS Name Date Redington Apr. 15, 1930 Weaver Feb. 12, 1934 Du Bois Feb. 21, 1939

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