US1957839A - Valve bag - Google Patents

Description

H. E. LEE

VALVE BAG May 8, 1934.

Filed July 17, 1935 2 SheetsSheet 1 3nventor. HBRRY E. LEE

Cittorneg H. E. LEE

VALVE BAG May 8, 1934.

Filed July 17, 1933 2 Sheets-Sheet 2 IN VEN TOR. HARRY E LEE A TTORNE Y.

Patented May 8, 1934 UNITED STATES PATENT OFFICE VALVE BAG Harry E. Lee, Oswego, N. Y.

Application July 17, 1933, Serial No. 680,728

Y 3 Claims. (01. 150-9) This invention relates to paper valve bags, designed for packaging and transporting pulverized and other relatively light materials.

The primary object of the invention is to construct a bag, from a prepared tube comprising a single sheet or web of foldable fiber having the usual satchel-bottom and a specially constructed filling end formed with an integral portion that constitutes the valve when the latter is folded cuff-shaped, and through which the bag may be filled, by well-known means; said filling end being virtually folded and pasted like the bottom for generally sealing said end, and said cuff-portion being manipulatable following the pasting and filling operations, for closing the valve against leakage and sifting. And a further object is to produce a valve bag in one part with a minimum waste of the fibrous material, with few hand operations and at relatively low cost.

I attain these objects by the means set forth in the detailed description which fpllows, and as illustrated by the accompanying drawings, in which- Figure 1 is a broken diagrammatic plan, showing the severing and slitting of the continuous tube preparatory to forming the filling ends of two bag blanks by a single die operation; also showing the integral valve portions. Fig. 2 is a plan view of one of the blanks showing certain creasings or scorings by which the valve and other flaps of the filling end are folded and overlapped. Fig. 3 is a view showing the primary extending of the valve and other slitted portions. Fig. 4 is a similar view showing the main valve flap folded upon itself and additionally creased preparatory to forming the cuff. Fig. 5 is a view showing the overlapping and pasting of one wing of the cuff and one of the main satchel flaps to partially form the cuff. Fig. 6 is a view showing the folding and pasting of the opposite wing of the cuff and the corresponding satchel flap. Fig. 7 is a broken side elevation of the bag and an edge view of the pasted filling end with the cuff extended, also showing the filling pipe in operative position. Fig. 8 is a view of the completely filled bag showing the free end of the valve cuff folded and being tucked beneath the unexposed portion of the valve for closing and sealing the same. And Fig. 9 is a view showing the completely sealed valve.

In the drawings, Fig. 1, 2 represents the usual prepared tube from which two tubular bag blanks, as AA, may be severed substantially on a zigzag line 2, and at the same time, the tube may be slit on longitudinal lines 2a, all by a single stroke of a suitable die. This severing cut 2 primarily forms the integral cuff and related portions of the valve, as 3--3', that preferably project beyond the normal squared ends of the blanks (see Figs. 1 and 2), while the slits 2a define transverse flaps 2b-2c2d that comprise the satchel structure of the filling ends of the blanks. In effecting this severing operation, the die simultaneously cuts the tube 2 on a transverse line 26. This latter cut completely severs the relatively small rectangular medial portion 2 which alone is discarded as Waste. After the blank A, for example, is thus formed, it is creased and scored as on diagonal broken lines a--a', lines 3a and a central line a, as shown in Fig. 2. The crease a: coincides with the lateral folds a" of the tube A when the latter is fiat, as shown in Figs. 1 and 2, and permits the filling end to be tilted relatively to the tube 2, as shown in Figs. 6 and '7. The next step consists of slightly expanding the blank A to permit the extending of the satchel flaps 212-20 in opposite di-. rections; the infolding of the flap 2d and also the unfolding of the main-valvefiaps or portions 3-3, as shown in Fig. 3. This latter operation is followed by applying an adhesive, as at can, after which the integral portions 3b3c that comprise the wings of the cuff 3 are folded outwardly by means of the scorings 3a, upon the angular body 3' and the adjacent top ends of flaps 2b-2c, as shown in Fig. 4. This last operation securely affixes the corresponding edges of the wings 3b-3c of the cuff to the body 3' and the flaps 2b-2c, as indicated at ca: in Fig. 4. The wings 317-30 as well as the flaps 2b2c are then held extended in a common plane momentarily while transverse creases c and c are formed, and this is followed by applying the adhesive to flaps 2c-2d, and also to wing 30 as shown at 3d in the upper right corner of Fig. 4. The flap 2b and wing 3b are next folded inwardly as one part on the crease c, as shown in Fig. 5, and this is followed immediately by folding the flap 2c and the wing 30 on crease c in the opposite direction upon the flaps 2b-3b to which they adhere and thus complete the formation of the cuff 3 and the closing of the filling end of the bag, as shown in Fig. 6. This flattens-the cuff 3 and leaves its free end 3e extended beyond the adjacent ends of the flaps 2b2c ready for the insertion of the filling pipe, as B, by which the bag may be loaded, as shown in Fig. 7. Upon the removal of the pipe B, the operator folds the protruding free end 3c of cuff 3 backwards and inserts said end between the body 3' and the unexposed portion of the cuff, as shown in Figs. 8 and 9. This final folding and tucking of the cuff 3, which is the only manual operation required, securely closes and seals the valve against leakage or sifting even of the finest materials, like carbon-black, pulverized insecticides and the like.

My invention is extremely simple, and by its practice as herein shown and described, I am able to produce economically valve bags of any size from ten pounds to one hundred pounds capacity and equip each bag with a safe and reliable integral valve that is not dependent upon an adhesive to afiix and hold it firmly in the filling opening at or near the loading end of the bag. My integral valve is so designed and interlocked to the adjacent integral satchel structure of the filling end, of which the valve is an integral part, that the valve is not liable to become loosened, dislodged or distorted, nor to allow the contents to escape when the bag is subjected to rough handling or to the inevitable jarring and jolting of rail, truck or other transporting agencies.

Having thus described my invention, what I claim, is-

1. In a valve bag, a tubular body folded at one end to form opposed overlapping wings and having a fiap at said end which is connected to the wings and which is folded inwardly and then outwardly to lie beneath the wings and having its free end extended beyond the adjacent ends of the wings, the sides of the fiap being overlapped and with the central portion of the extended free end of the flap being foldable upon themselves and insertable between the inwardly and out- Wardly folded parts of the body of the flap.

2. In a valve bag, a tubular body folded at one end to form overlapping wings and having a flap at said end which is folded inwardly and then outwardly to lie beneath the wings and having its free end extended beyond the adjacent ends of the wings and having its sides overlapped, said extended end and sides of the flap being foldable upon themselves and insertable between the inwardly and outwardly folded parts of the body of the flap.

3. In a valve bag, a body having a pocket adjacent one end, the inner end of which pocket is closed, means carried by the body and overlying the outer side of the pocket and cooperating with the said outer side of the latter to provide an inlet for a filling pipe, said means having an extension which with the free end of the outer side of the pocket is foldable upon themselves and insertable in the pocket.

HARRY E. LEE.

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