US2977038A - Insert for bag valves - Google Patents

Description

March 28, 1961 2,977,038

F. G. LA FAVE INSERT FOR BAG VALVES Filed Jan. 22, 1958 2 Sheets-Sheet 1 Ill///// I/III/(I/ INVENTOR.

FRANCIS GL4 [51' 1 5.

ATTOAIVEKX March 28, 1961 F. G. LA FAVE 2,977,038

INSERT FOR BAG VALVES Filed Jan. 22, 1958 2 Sheets-Sheet 2 INVENTOR. ['FA NC/J CZ LA/ZVE.

WWWJW INSERT FOR BAG VALVES Francis G. La Fave, Pensacola,-Fla., assignor to St. Regis Paper Company, New York, N.Y., a corporation of New York Filed Jan. 22, 1958, Ser. No. 710,530

3 Claims. (Cl. 229-625) the valve of a pasted end type of bag whereby the spout is prevented from catching and dislodging such sleeve.

'In order to aid the insertion of a filling spout into the valve of a bag, one side of the valve construction is offset relative to the other so that the spout can be pressed atent Various, further and more specific objects, features and advantages of the invention will appear from the description taken in connection with the accompanying drawings which form a part of this specification and illustrate by way of example one embodiment of the invention. The invention consists in such novel features and combination of parts as may be shown and described in connection with the articles herein disclosed.

In the drawings:

Fig. 1 is a fragmentary perspective view showing the valve corner of a multi-ply pasted end bag embodying the present invention;

Fig. 2 is a view similar to that shown in Fig. 1 showing the valve in open position such as occurs during filling of the bag;

Fig. 3 is a fragmentary plan view showing the valve corner construction of Figs. 1 and 2 but in an earlier stage of manufacture with the bottom flaps laid open and thus against one such ofiset side thereby to open the valve while the latter is being held manually. Thus in the valve construction of a pasted end type of bag it is normal to press the spout against the exposed triangular face of the valve flap while sliding the spout toward the valve opening, the valve preferably but not necessarily being manually squeezed open at this time. In a sleeved valve such sliding contact of the spout upon such exposed triangular face of the valve flap most easily occurs along the centerline of the latter flap in the path of a seam of the valve sleeve, which seam in the past normally has been positioned along such centerline. The seam comprises overlapping longitudinal edges glued together thereby forming a relatively stiff double thickness. Due to the stiffness of such seam, it is difficult to adhere or glue the seam area securely to the valve flap, and this often results in the filling spout catching or snagging the sleeve seam and dislodging or mutilating the sleeve, and may, for example, cause the sleeve to plug the valve opening by being crumpled therein.

One of the objects of the present invention is to overcome the above difficulties.

The invention in a preferred embodiment thereof comprises a sleeve valve construction for a pasted end type of bag bottom, the sleeve extending interiorly of the bag at the valve corner, the sleeve being so formed that it has no overlapping longitudinal edge surfaces which normally form the aforementioned seam, such seam thus being omitted in the present construction, the sleeve being formed instead with its longitudinally extending edges spaced from one another, for example by one-half inch, thereby in effect forming a longitudinally extending cutout portion in the sleeve. Such spaced apart longitudinally extending edges of the sleeve are positioned on the valve flap on either side of the path which is frictionally engaged with relatively greatest intensity by the spout when the latter is inserted into the valve thereby eliminating those sleeve portions which were heretofore caught or snagged by the spout whilebeing slid into the valve. If desired, portions of the outer margin or lip of the sleeve' which are opposite to the aforementioned spaced apart-edges or cut-out portion may contain several parallel slits which extend longitudinally of the sleeve. These may be formed to inhibit the spout from catching on this particular lip or margin of the sleeve. In the event that the filling spout does catch or snag such slit outer lip portion of the sleeve the latter will easily fold back allowing the spout to enter the valve without misplacing or mutilating the sleeve.

prior to final folding of such flaps and formation of the bottom;

Fig. 4 is a view similar to Fig. 3 but showing the valve corner prior to the positioning or application of the valve sleeve;

Fig. 5 is a perspective view from below of the valve sleeve employed in Figs. 1-3;

iFig. 6 is a view similar to that of Fig. 4 showingthe valve corner of a valve bag prior to the positioning or application of the valve sleeve therein, but with a modified pasted area, such area being modified by eliminating the paste between the bottom fold lines;

Fig. 7 is a perspective view from below of the valve sleeve adapted to be employed with the valve corner construction of Fig. 6, the valve sleeve being similar to that shown in Fig. 5 with the exception of the application thereto of adhesive along selected areas thereof as shown in the shaded areas; and

Fig. 8 is a fragmentary plan view showing the modified form of valve corner construction employing the sleeve of Fig. 7 applied to the valve corner shown in Fig. 6, the valve corner construction being shown with the bottom flaps laid open and thus prior to final folding of such flaps and formation of the bottom.

Referring to Figs. 1-4, a bag 11 is shown having a .valve construction which embodies the present invention. Bag 11 is a multi-ply, pasted end paper bag having a valve flap 12 and valve sleeve 13. As shown in Fig. 5, sleeve 13 is formed with its longitudinal edges 13a, 13b spaced apart in parallel relation thereby in efiect forming a longitudinal cut-out or slot portion 14 extending throughout the length of the sleeve. This, as aforementioned, is in contrast to the conventional practice of forming such sleeves with overlapping longitudinal margins.

It .is possible initially to form the sleeve 13 in the conventional manner with overlapping pasted margins and then to cut material from the finished sleeve to form the longitudinal cut-out 14. Alternatively, the sleeve 13 can be formed by folding sleeve sides 13c and 13d inwardly from a flat condition along lines 13a and 13] respectively, so that the edges 13a and 13b are initially spaced from one another as shown in Fig. 5, and without initially forming an overlapping seam which is later removed.

- Usually, but not invariably, it is desirable for the spaced edges 13a, 13b to extend the entire length of the sleeve in order to provide protection from mutilation or displacement by a filling spout. If, however, the sleeve extends further into the interior of the bag than would a filling spout during filling of the bag, then it is possible to form the sleeve so that such spaced edges 13a, 13b extend only from the outermost lip or end of the sleeve to a point at least as far along the length of the sleeve as a filling spout extends during filling of the bag;

In forming bag 11, the bag bottom is prepared for folding as shown in Fig. 4, a stepped end type of bottom being here shown. Adhesive then is applied to the areas shaded in Fig. 4. No adhesive is applied to area 121) in order that no adhesive will come in contact with the upper portion of the valve sleeve between the spaced edges 13a, 13b (or through the cut-out portion 14'). The extension sleeve 13 is then positioned on valve flap 12 as shown in Fig. 3. Thereafter side flaps 16 and 17 are folded over fold lines lea and 17a, respectively, and pasted \to form the finished stepped end bottom shown in Figs. 1 and 2.

Slits, such 18, 19 and 29, may be cut in the top front edge of sleeve 13 on the side opposite the cut-out portion 14 to prevent the spout catching this edge, that is, to provide an edge portion that will easily give way to let the spout pass should the spout catc such edge.

The longitudinal cut-out portion 14 and the slits 18, 19, 29 are placed so that there is no tendency for the sleeve 13 to be mutilated or displaced by the insertion of a filling spout. Since a filling spout is most easily inserted along centerline 12a of the valve flap 12, the spaced edges 13a, 13b are located along but spaced from such centerline. Consequently, portions of the sleeve 13 do not engage the spout directly along the path (12a) where such spout otherwise most likely would catch and displace or tear same.

It will be noted from Fig. 4 that paste is applied to the valve flap 12 on either side of the centerline 12a as follows: (a) from the upper edge 12c down to line 12d, the latter being spaced above the centerline 12a by a distance equal to one-half of the width of the area 12b; and (b) from the edge lZe up to the line'12f, the latter also being spaced from the centerline 12a by a distance equal to one-half of the width of the area 12b. Hence the lines 12d and 12 are parallel to one another and equidistantfrom the centerline 12a and are located in such a manner'that, as aforementioned, the adhesive or paste will not reach the upper inner portion of the valve sleeve 13 when the latter is applied.

The uppermost of said adhesive-bearing areas (Fig. 4) thus extends across the fold line 16a and the lowermost of such areas also extends across its respective fold line 17a.

Referring now to Figs. 6, 7 and 8, a modification will be described which is identical to that above described with the following exceptions: The valve corner construction of Fig. 6 is identical to that shown in Fig. 4 with the exception that adhesive or paste is entirely eliminated between the fold lines 16a and 17a. Thus on the uppermost section of the flap 12, as viewed in Fig. 6, paste is applied to the relatively restricted area 21 between the uppermost edge 120 of such flap and the fold line 16a, and with respect to the lowermost portion of said flap 12, the adhesive is applied to an area 22 similarly restricted between the lowermost edge 12:: and the fold line 17a.

Referring to Fig. 7, it will be noted that adhesive or paste is applied to the valve sleeve 13 itself at areas 23 and 24, respectively, which extend from the outermost edges 13a and 13 respectively, inwardly toward the centerline of the sleeve respectively to lines 25 and 26, the lines 25 and 26 being spaced from their respective edges 13b and 13a by a selected amount.

The paste or adhesive areas 23 and 24 are thus positioned for adhering the outer marginal area of the valve sleeve to the areas 27 and 28, respectively, when applied to the valve construction as shown in Fig. 8.

Thus, if desired, the adhesive or paste is applied to the valve sleeve itself rather than to the bottom of the valve.

While the bag described above is a multiwall pasted end type paper bag, it Will be understood that the invention is also applicable in non-analogous forms to single wall bags or to sewn end bags. The invention is, in fact, applicable to any bag in which a valve flap extension is employed and in which it is desired to prevent mutilation or displacement of such extension during filling of the bag, it being understood that the location of the spaced apart longitudinal edges of the sleeve (cut-out portion) is on a part of the bag valve along the path which the spout frictionally engages with substantial intensity, as along line 12a above-mentioned.

While the invention has been described in detail with respect to a preferred embodiment, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention and it is intended to cover all such changes and modifications in the appended claims.

I claim:

1. In a valve construction formed in a valve bag adapted to be filled by a filling spout extending into such valve, such construction including a valve opening and a flap for closing said opening, supplemental sheet means having an exterior edge lying adjacent the surface of said flap, said sheet means extending from said exterior edge towards the interior of the bag and being formed with longitudinally extending edges which are spaced apart from one another and which are secured to such valve flap, such spaced apart longitudinal edges being located along a selected path of such valve construction to leave a longitudinally extending central region of said valve flap uncovered by said sheet means, such path thus offering no obstacle to the passage therealong of such filling spout.

2. In a valve formed in a valve bag and including a valve flap, a sleeve secured to such valve flap and extending along at least a portion of the length thereof and towards the interior of the bag, said sleeve having longitudinally extending spaced apart edges so disposed relatively to said valve flap as to expose therebetween a longitudinally extending central region of said flap.

3. In a valve formed in a valve bag and including a valve flap, a sleeve secured to such valve flap and extending along at least a portion of the length thereof and towards the interior of the bag, said sleeve having longitudinally extending spaced apart edges so disposed relatively to said valve flap as to expose therebetween a longitudinally extending central region of said flap, and a slit running inwardly from the exterior end of said sleeve at a region thereof'diametrically opposite the exposed region of said flap.

References tilted in the file of this patent UNITED STATES PATENTS 1,993,377 McNulty Mar. 5, 1935 2,176,499 Hoppe et al Oct. 17, 1939 2,891,716 Lee June 23, 1959 FOREIGN PATENTS 474,425 Great Britain l i Oct. 29, 1937 745,327 Great Britain Feb. 22, 1956 963,832 Germany May 16, 1957

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