US2070685A - Bag and process and device for effecting closures therein - Google Patents

Description

W. W. ROWE Feb. 16, 1937.

BAG AND PROCESS AND DEVICE FOR EFFECTING CLOSURES THEREIN Filed Jan. 13, 1955 2 Sheets-Sheet 1 ml; m 4/ fi A I m M/Z/QZZZ EL'QL 61% ATTORNEYS w. w. ROWE 2,070,685

PROCESS AND DEVICE FOR EFFECTING CLOSURES THEREIN 2 Sheets-Sheet 2 Feb. 16, 1937.

BAG AND F1161 Jan. 15, 19 5s INVENT R.

ATTORNEYS,

Patented F b. 16, 1937 v t 2,070,685

UNITED STATES PATENT OFFICE BAG AND PROCESS AND DEVICE FOR EFFECTING CLOSURES THEREIN William Wallace Rowe, Cincinnati, Ohio, assignor, by mesne assignments, to Bemis Bro. Bag 00.,

t. Louis, Mo., a. corporation of Missouri Application January 13, 1933, Serial No. 651,577

1 Claim. (01. 150 7) My invention relates primarily to the forming construction and arrangement of parts in the of top closures in bags, preferably after the conbag and in the apparatus for closing the same,

ing of closures in bags of the cemented scam in 10 type. Developments have been made in cemented Figure 1 is a partial elevational view of a bag 10 of burlap and creped paper, giving a bag having bodying my invention.

l5 certain advantages because the seams therein Fig. 3 is a trimetric view showing .the top may be made quite impervious in the cementing closure of my invention. operation. Ordinarily such bags have a seam Fig. 4 is an elevation of an exemplary closing construction such that 'textile material may be machine embodying my invention.

cemented directly to textile material, and the Fig. 5 is a perspective view of my machine with cementing agent used is preferably a rubber laa bag entering it.

tex, or other rubbery substance. Bags of this Fig. 6 is a sectional view of the adhesive ap character have been successfully manufactured plying flap positioning and pressing means of my with side or center body seams and with adeinvention.

quately cemented body closures; but substantial Fig. 7 is a plan view of the same mechanism. 5 problems have arisen in the efiecting of top 010- Throughout the several figures I have shown after filling. Speed is necessary and it is incontextile material outwardly disposed and the pa- 30 plicated by the material with which the bags are such seams are not a limitation upon my presfilled; and haphazard closing methods do not -ent invention. It has been suggested to form a give adequate resillts. 4 top closure in bags of this characterby applying 40 e primary objects of my invention are-diover the edges of the mouth of a bag a separate rected to the solution of problems of this charstrip of material lapped thereabout. Preferably,

closing such that a closure may readily be efto the bag with the textile side inwardly disposed 45 method for closing bags of the character referred be outwardly disposed, thereby preserving the 50- These and other objects of my invention which light. Also it has been suggested to make top or will be pointed out hereinafter or will be apother seam closures in bags or other articles, parent to one skilled in the art upon reading which comprises coating the portions of adjacent ons, I accomplish by that certain plies intended to be adhesively secured together,

of an adhesive substance which remains tacky at least to similar bodies of adhesive substance, and'then protecting these surfaces with a protective covering strip. When seam formation is desired, this protective covering (1 the coating strip maybe removed an two previously treated surfaces brought together whereby they instantly adhere. The bag and the closure method and device herein described are applicable to all of these types of closures, as well as to others, and in the description which follows it will be understood that these teachings and others may be employed in the resultant bag structure.

With reference to the formation of top closures separate from the bag body which are to be folded and led onto the juxtaposed edges of the bag mouth after the'filling operation. Such a procedure calls for a careful positioning of the component parts, which is difficult to secure when one of the parts is completely disconnected from the bag body.

it is inconvenient to handle individual separate strips and to feed them onto the bag by machinery, it would appear that the use of the closure members in the form of a continuous rolled band or strip would be advisable. However, such use involves special problems, since it is necessary to cut the strips apart between the bags. When the supply of filled bags is irregular, problems arise in connection with the use of the adhesive and the application thereof, or doping of portions of the strip which are not to be used for the last filled bag, together with problems connected with loss of material between bags when the bags are widely interspaced, and the drying of adhesives before bags have been brought into position to receive the strip. Consequently one aspect of my invention is directed to the pro- 40 vision of a bag with a partially attached closure member. The bags are made in this form by the manufacturer, so that the adhesion of one side of the strip to a bag body wall may be made under optimum conditions, and so that the positioning of the strip with respect to both predetermined by the attachment thereof to one of the body walls, and so that it is merely necessary to fold the projecting portion of the strip over the other body wall with or without the application of adhesive, as determined by the particular closure method chosen.

In Fig. l I have shown a bag having a body I,

the mouth of the bag being indicated at 2. Adjacent the mouth I position a strip 3, adhesively securing it to one of the body walls in the position shown, so that the upper portion of the strip projects beyond the mouth of the bag. Also I prefer to have the strip project as shown at 4 beyond the side edges of the bag, for a purpose which will hereinafter be described.

After such a bag has been filled it is necessary merely to apply adhesive-to tion of the strip 3 and/or to the corresponding portion of the body wall of the bag over which said strip is to be folded, afterward folding the strip over into position and pressing it against the body wall, and holding it in such position long enough to allow the adhesive to set sufliciently to hold it in position. All of these operations may be done by machine. Since in the filling of bags with powdery materials, some of these materials may collect on the surfaces which are to be adhesively secured, such collection will not inhibit the adhesive union when the adhesive is applied after the filling of the bag. It will be clear also body walls is v the projecting poropposite body wall of the bag,

that by first securing the strip 3 to one of the body walls of the bag its position with respect to the finished bag is thereby determined, and there arises no problem similar to that which arises in the attempt to fold and position and adhesively secure a separate strip about the mouth of a bag.

If adhesive has previously been applied to the projecting portion of the strip 3 and the adjacent portion of the body wall, the surfaces will necessarily be protected by a cover strip which will be removed preferably after the filling of the bag, so that the dusting of its contents will not inhibit the adhesive character of the treated surfaces.

Within Fig. 2 I have shown adjacent body walls at la and lb. Cover strip 3 is shown as folded over the top of the bag and secured thereto by layers of adhesive 5 and 6.

In Fig. 3 the body walls of the bag are again indicated at In. and lb, and the strip portions at 3. It will be clear that the strip portions extending beyond the sideedges of the bag are cemented directly to each other at the points'l and 8, whereby siftage at the corners of the bag is prevented, and impervious seam construction is attained. My general process therefore is one of manufacturing, filling and sealing bags which comprises forming a bag, positioning adjacent the mouth thereof a sealing flap, securing said flap to one of the bag Walls adjacent the mouth, filling the bag, and afterward turning over and adhesively securing the remaining porwall of said bag. Due to the construction which I have hereinabove described is one which can.be performed by machinery such as I shall nowdescribe.

Turning to Figs. 4 to 'I, inclusive, I have shown a machine having a framework indicated generally at 9. on or adjacent the framemotive power such as the electric motor 10, which in this instance drives a gear box H from the driven shaft of which power is taken off for the remainder of my device. A starting box for the motor may be provided as at l2. The framework supports means for'carrying bags the machine, and while other arrangements are possible, I have shown a roller conveyor frame l3 over which a belt l4 passes, said belt also passing over sheaves l5 and H5 at the ends of the sheave l6 may be driven by a chain l1 from a main shaft l8, which in turn is driven by a chain Hi from the speed reduction gearing H. Side guides 20 and 2| may be provided adjacent the main conveyor to engage the sidesof the bags and to keep the bags in upright position. Instead of solid side guides I may, of course, employ belts or other conveyor mechanismswhich will not inhibit and may be arranged to assist the movement of the bags. Located above the main conveyor provide a forming and closing mechanism comprising essentially a series of initial pressure rolls, and means for turning over the attached flap into a horizontal position, and a means for applying adhesive to the turned over flap portion, and a means for bringing the fiap down against the together with means for pressing the adhesively secured parts together. Accordingly I have shown a first series of pressure rolls 22 mounted on a framework 23 Reference to Figs. 6 and 7 will show the bag 24 entering the machine and being engaged by this first series of rollers with the attached flap extending upwardly. I next provide a means to turn the flap down into conveyor. The v been treated on its undersurface with adhesive 33, which is horizontally disposed, but extending therefromto the first roll bag. While it is adequate to employ a plate former for the first bending operation,

one is preferably mounted in a movable Journal,

so that it may be caused to exert pressure against the material fed therethrough, but the movements of the journal are so controlled that the upper roll will be held away from the lower rollwhen no material is being fed therethrough, so

that the upper roll will not become coated with the latex or other adhesive.

When the flap has been bent over and secured to the body wall, as hereinabove described, the bag top is engaged by the second series of pressure rolls 35. These rolls are vertically disposed like the first set, and both sets are preferably driven at a speed somewhat higher than the speed of the conveyor belt I '4. Above the sets of pressure rolls I have indicated aplate 36. The mechanism just described coacts to keep the top edge of the bag riding fully within the pressure area of the pressure rolls. Since the lower end of the bag tends to trail somewhat, the rear end of the upper edge adhesive may controlled. The several rollers may, however, have individual mountings, and this is preferable under some conditions. Where rolls are employed they preferably terminate in sprockets 38, connected by chains so that the several sets of rolls will be simultaneously driven. One of the sets. of rolls may be fitted with bevel gears 39, driven from co-operating bevel gears 40 on the main shaft I8. The other set of rolls may be correspondingly driven from a jack shaft 4!, connected to the main shaft by a chain 42. In Fig. 6 I have shown grooves 43 in the rolls 35. The purpose of these grooves is to alleviate the pressure along a certain line at which the latex or other accumulate to form a relatively thick film or head. This prevents the extrusion of the adhesive from between the lapped layers, and also prevents the formation of so thin a film at all points over the surface as would fail to give goodoadhesion.

Since the right hand end of the device as shown in Fig. 4 is the entering end, and since the operator will normally be stationed here, I prefer to to the operator.

It will be clear that modifications may be made in my invention without departing from the spirit thereof. t

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:-

A composite bag of outer textile and inner paper materials prepared for filling and closing, comprising a composite sealing flap of inner textile and outer paper materials attached to one of the bag walls adjacent to and at least the full width of the mouth thereof and projecting therebeyond in such a position as to folded over and walls, the inner to the outer textile of the bag.

wnimM WALLACE aown.

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