US2136990A

US2136990A - Method and apparatus for the formation of bags and the like

Info

Publication number: US2136990A
Application number: US107956A
Authority: US
Inventors: Adrian O Daller
Original assignee: UTILITY PACKAGES Inc
Current assignee: UTILITY PACKAGES Inc
Priority date: 1936-10-28
Filing date: 1936-10-28
Publication date: 1938-11-15
Anticipated expiration: 1955-11-15

Description

Nov. 15, 1938. A. o. DALLER- METHOD AND APPARATUS FOR THE FORMATION OF BAGS AND THE LIKE Filed 001;. 28, 1936 6 Sheets-Sheet l NN v FRN INVENTOR 4M 0. 10m

BY J Nov. 15, 1938. A. o. bA LER 2,136,990

METHOD AND APPARATUS FOR THEFCRMATION OF BAGS AND THE LIKE Filed Oct. 28, 1936 6 Sheets-Sheet 2 INVENTOR A NEYS Nov. 15, 1938. A. o. DALLER METHOD AND APPARATUS FOR THE FORMATION OF BAGS AND THE LIKE Filed Oct. 28, 1956 6 Sheets-Sheet 5 INVE NTOR & M

1:. AT NEY5 Nov. 15, 1938. I A. o. DALLER METHOD AND APPARATUS FOR THE FORMATION OF BAGS AND THE LIKE 6 sheets-sheet 4 Filed Oct. 28. 1936 v INVENTOR M 0? My ATTO A. o. DALLER 2,136,990 METHOD AND APPARATUS FOR THE FORMATION OF BAGS AND THE LIKE Nov. 15, 1933.

6 Sheets-Sheet 5 Filed 001;. 28, 1936 ATT RNEYJ Nov. 15, 1938. N A. o. DALLER 2,135,990

METHOD AND APPARATUS FOR 'THE FORMATION OF BAGS AND THE LIKE 6 Sheets-Sheet 6 Filed Oct. 28, 1936 m T N E V m Patented Nov. 15, 1938 Q METHOD AND APPARATUS FOR THE FOR- MATION OF BAGS AND THE LIKE Adrian 0. Daller, Upper Darby, Pa., assignor to Utility Packages, Inc., New York, N. Y., a corporation of New York Application October 28,1936, Serial No. 107,956

23 Claims.

This invention relates to methods and apparatus for the formation of bags and to correlated inventions and discoveries whereby andwherewith the same may be enhanced.

This application is a continuation in part of my copending application Serial No. 6

which became Patent No. 2,072,421.

In general, it is an object of the invention to provide methods and apparatus whereby various of the steps involved in the formation of a lined package may be carried out with effectiveness and efllciency.

Another object is the provision of an improved method forforming carton liners and other types of bags.

Another object is the provision of an improved method for the sealing of the sides or other parts of the bags before they are finally sealed so as to become packages.

Another object is the provision of improved apparatus for the formation of carton liners and other bags.

Another object is the provision of improved ap paratus for the sealing of the sides or other parts of the bags before they are finally sealed so as to become packages. v A further object is the'provision of a method and apparatus for the efilcient and effective sealing of liners and other bags formed of wax paper and the like before the same shall have become packages.

Another object is the provision of a method and apparatus for preparing the liner or other bag so that the liner or bag may thereafter be sealed into a package.

Other objects of the invention will in part be obvious and will in part appear hereinafter.

The invention accordingly comprises the several steps and the relation and order of one or more ,of such steps with respect to each of the others, and the apparatus embodying features of construction, combinations of,elements and arrangement of parts which are adapted to effect such steps, all as exemplified in the following detailed disclosure, and the scopeof the application of which will be indicated in the claims.

For a -fuller understanding of the nature and objects of the invention, reference should be had to the following detailed description taken in connection with .the accompanying drawings, in

which:

Figures 1 and 2 are, respectively, side and plan views of bag-forming apparatus embodying the invention, with certain of the conventional parts omitted, and illustrate one manner in which steps embodying the invention may be performed;

Fig. 3 is a detail view illustrating a modified form of plunger and amodified form of sealing means;

Fig. 4 illustrates another modified form of such a mechanism;

Fig.5 is a diagrammatic showing of various of the steps involved in the formation of a bag by the use of the apparatus and methods illustrated in Figs. 1 to 5.. I Fig. 6 is a side view of a modified form of bagforming mechanism, certain of the conventional parts being omitted, and illustrating a manner in which a modified method may, be carried out;

Fig. 7 is a sectional view on the line 1--1 of Fig. 6; 1

Fig. 8 is a view similar to the first part of Fig. 4 showing the steps of constructing a bag by the method and apparatus illustrated in Figs. 6 and r Fig. 9 is a side view of a modification of the apparatus shown in Fig. 1; 1 f

Fig. 10 is a section, in perspective, of a web which has passed through the apparatus shown in Fig. 9;

Fig. 11 is a perspective view of the adhesiveapplying rollers and pressure roller shown in hesive onto both surfaces of the web of material passing therethrough;

Figs. 14 and 15 are perspective views of the adhesive-applying rollers shown in Figs. 12 and 13' Fig. 16 is a section, in perspective, of a web which has passed through the apparatus shown in Figs. 12 and 1 Fig. 17 is a perspective view of a sheet cut from a web which has passed through the apparatus shown in Figs. 12 and 13 and of a similar sheet which has undergone the first folding step;

Fig. 18 is a diagrammatic showing of various positions assumed by a sheet during its formation into a bag by the use of the apparatus and methods illustrated in Figs. 13-17; and

' Fig. 19 is a perspective view of a modified form of web which might be produced by certain rollers in the device shown in Fig. 9 and of various positions assumed by a sheetfrom that web during the formation of said sheet into a bag.

In the formation of bags, lined cartons, etc., it

is of importance that a high degree of 'efilciency of operation be obtained. It is also of importance in the formation of many types of packages that the goods be effectively sealed. One of the main purposes of such sealing in many cases is to prevent the entrance of moisture to a point within the package where it will affect the goods. Water-proof sheet material, .such, for instance, as waxed paper, and paper coated or impregnated with other moisture-proofing materials, is used to a large extent in such packaging operations, particularly as liners for cartons. ,For

The attainment of a sufficiently high degree of moisture-proofing in commercial operations to protect effectively the goods is, however, amatter of considerable diillculty and resort is often had in additional and otherwise unnecessary layers of moisture-proofing material on the outside of the carton. Other purposes of such sealing is to render carton liners or other bags sift-proof, grease-proof, stain-proof, etc., since it is of importance in many cases that the goods be retainedsecurely in the bag and that the outer surface of the package be not discolored or otherwise adversely affected. For instance, a sift-proof bag is of advantage for holding flour, and a siftand stain-proof liner containing coifee will prevent the discolora ion of the carton.

A feature of the present invention resides in the provision of methods and means whereby carton liners and'other bags, which have been effectively sealed in part and which may be specially prepared to be sealed completely into packages, may be readily provided, and the invention permits the provision of bags of many types and for a wide variety of uses. An additional feature of the invention resides in the provision of particularly eflicient modes of operation and 'mechanisms for the formation, at least in part, of bags, lined cartons and other packages, and various other features will be apparent from the following description.

In accordance with the invention, one or more stripes of adhesive may be, applied to a web of paper or other material in such positions that, when out and formed into bag shape, a stripe of dry adhesivewill be provided at the top of the bag, adhesive being applied at other positions desirable for the formation of the bag as desired. After filling, the bag may be sealed by means of a dry adhesive. It is contemplated that the bag formed in accordance with the present invention may have its top pointed and sealed by a straight line operation, which forms creases only at the ends of the bag. If the sheet material and adhesive used are of such nature that they do not seal readily, it is of importance that the dried adhesive extend about all the contacting inner surfaces of the bag, although this is not essential in other cases.

Where the side or other seams are secured along the contacting inner surfaces thereof by dry adhesive, there are certain advantages not only in the final closing of the seams, but also in the manipulation-of the web or sheet while or after the adhesive is first being applied. As soon as the adhesive has been or has dried, the web or sheets may be passed over rollers with the adhesive side or sides against various rollers in accordance with the particular type of feeding or folding machine used.

As will be apparent, the adhesive may be applied to sheets after cutting, or may be applied in whole or in part to a web or sheet at a point remote from the bag-forming mechanism, as at a paper manufacturing plant, if desired, and may in. all events be applied in any of a variety of positions and the bag formed in any'of a variety of ways.

Thus, the adhesive may be applied in stripes.

transversely or longitudinally on one or more sides of the web or sheet. The extended application, i. e., stripe, may be of any width and, as said before, certain of the stripes may be of adhesive which seals to itself when dry and certain others may be of adhesive which does not. As above indicated, the formation of bags from sheets of waxed paper may be readily carried out in accordance with the invention.

It is to be understood that in the broader aspects of the invention, any of a wide variety of sealing means may be utilized and that in the formation of lined cartons, a wide variety of mechanisms and steps may be utilized in effecting the operation.

In Figs. 1 and 2, there is illustrated a form of procedure and apparatus whereby lined cartons may be efficiently and effectively formed in accordance with the invention.

In the illustrated construction, the moving parts may be driven from suitable power means, such as an electric motor, not shown, and suitably interconnected, as by gearing. Various operating parts and interconnecting mechanisms, which may be of types well known in the art, are omitted in order to avoid prolixity.

A pair of rolls l0 and II serve to draw a web I2 from a roll i3 over the roller l4 and under glue-applying rolls l5 and I6, whereby a wet adhesive, suitably supplied as from one or more glue troughs I1, is applied to the edges of the web to form stripes l8 and I9 Rollers Ila extend into troughs i1 and carry adhesive from them to rollers l5 and i6. Beyond the rolls [5 and I6 and underneath the web, there is provided a suitably formed member which may be a plate 20 heatedthroughout or at its ends to dry the wet adhesive. Means for drying adhesive may be positioned in the device wherever it is desired 1 to dry, on the web, adhesive which has previously been applied to the web. Where the web has wax over most of the surface, it is advisable toheat only those portions of a plate 20 over which a longitudinal stripe of adhesive is to be dried, e. g., the side ends in Fig. 2. Where there is little or no coating, like wax, which might be harmed by passing through, or over, or under a heated zone, the forward or rearward end or the entire plate 20 may be heated andused to dry the areas of wet adhesive as they pass. Conveyor belts 2i are driven from the roller II. In order to prevent the web frorn'becoming scorched when its movement is halted for any reason, suitable mechanism is provided to remove the plate upon the halting of the moving parts, including the rolls [0 and II.

In the present instance, the plate 29 is supported by means of an arm 22 pivotally mounted on a shaft 23 and supported by linkwork in: cluding a link 24, a bell crank 24a mounted on a shaft 24b and a link No. The link 240 is connected to a sleeve 25 which slides on a shaft 26. The shaft is normally rotated by means of gearing (not shown) operated from a belt 21 extending over a roll 28, driven, in the present instance, by means of the conveyor belt 2 I. The sleeve 25 is carried on a sleeve 29 of a centrifugal toggle mechanism 30, the other end of which is secured to the shaft at 3|. Whenever the roll H, and consequently the shaft 26, is operating the centrifugal toggle mechanism acts to draw the sleeve "to the right, causing the linkwork to swing into the position shown by full lines so as to hold the plate 20 in its operative which is slidably keyed to the shaft 26 and carries one end lines, and to move the plate away from the web.

Stripes of wet adhesive are applied transversely to the web by-means of an intermittently operated glue roll 33 supplied with a wet adhesive, as from a glue trough 34. There may be an intermediate roller, 34a, similar in function to roller lla. Desirably, the roll 33 is dropped upon the web, lifted momentarily, and dropped again, to provide stripes 35 and 38, and then is moved upwardly to receive glue before the application of two similar stripes. To effect this operation, I any well known or suitable mechanism, including a cam or other means to effect such movement, may be utilized. As mentioned before, the

wet stripes

35 and 33 may be dried if it is so desired. The web is out into sheets as by means of a rotary cutter 31, which is timed to cut the sheets between each pair of

stripes

35 and 36.

Each sheet 33, after it is cut, is carried by a high-speed conveyor 38a over folding rollers 39, under a form which, in the present instance, consists of a plunger 40 operated in synchronism with the other elements by any well known or suitable mechanism. Stop means 40a is provided to assure proper alignment of the sheet. Wires 40b may be stretched above the sheet to hold it against the conveyor. The plunger serves to press the sheet between the rolls 39 so as to fold the side portions of the sheets upwardly to provide the 'sides of the bag. The plunger then carries the folded sheet between additional folding members 4i and 42, which move successively against the plunger 'and fold inwardly first the un'glued, c'ut edges of the sheet and then the glued edges; so that

the'wet stripes

35 and 36 overlap the other edge portion. of the sheet. The tabs arethen turned up and these and the overlapping edge portions sealed, as by a pair of suitably heated Irgolls 43 and 44 past which the plunger moves the It is to be noted that the upper portion of the plunger is recessed so that the stripes of dried gluelB and is do not contact the plunger. Thus,

danger of thebag sticking to the plunger, or of.

removing adhesive later needed for the sealing of the bag, is avoided. The plunger is desirably recessed about its entire periphery, as shown, but may be. recessed merely at the sides along which the rolls 43 and 44 move. The plunger projects the bag, as indicated at 45, into a carton 48 on a. carton holder 41, and the plunger is thereupon drawn upwardly. Stripper fingers 48 are provided to prevent the withdrawal of the bag with the plunger, and the plunger is preferably formedhollow with an opening to the atmosphere to prevent a differential in air pressure being set up. The stripper fingers comprise the ends of a coil spring 48a wound about a shaft The lined carton may be transferred to a continuous conveyor 49 by a suitable mechanism such as a pusher bar 50 and rides directly from this conveyor to any desired position or to some other conveyor.

A variety of types of adhesive materials may is desirable to use both the glue rolls l5 and I6 since, when dry, the adhesive unites more readily with itself than with the waxed paper.

As above indicated, the exemplified method and apparatus may be modified in a variety of .ways, a few of which are hereinafter exemplified.

In certain instances, the plunger itself may be heated, one form of heated plunger being exemplified at 84 in Fig. 4. When the plunger is heated, cold rolls 85 may be utilized. It may be noted in this connection that, where adhe-. sives which do not require the use of heat are utilized, heated members may, of course, be dis-.

pensed with.

In order to assist in the visualization of the steps hereinbefore described, various stages in the formation of the package-are exemplified in Fig. 5. Asheet, ready to be formed into a bag, is shown at a; at b, the sides of the bag are shown bent up; at c, the edges of one side are shown bent inwardly; at d, the edges of the other side are so shown; at e, the tabs are shown folded up and the overlapping portions sealed; at f, the'bag is shown inserted in a carton.

When it is later desired to change the bag to a package, stripes l8and l9 may be pressed together, with or without heat; and without a solvent or other reactivating agent.

In Figs. ,6, 7 and 8' there is exemplified a method and apparatus for forming bags by a diiferent type of shaping operation. Trans-' v'erse'stripes of adhesive may be applied to a web H0 by means of a roll H l operating similarly to the roll 33, except that a single stripe instead of a double stripe is applied. These stripes areshown at llla in Fig. 8. The roll I l I extends substantially across the entire width of the web. The web is drawn from a roll H2 under the roll ill and over a hot plate H3 by means of rolls H4 and H5. The hot plate H3 is preferably supported so that it will move away from the web if the motion of the web is stopped for any reason. A mechanism similar to that shownv in connection with the plate 20 may be used for this purpose. Adhesive is then applied to one edge of the web bymeans of a roll H6, similar to the rolls IE, to provide a stripe 6a, and transverse stripes of adhesive, just forwardly of the stripes laid down by the roll III, are applied by an intermittently operable roll H1, which is similar to the roll ill, except that it is recessed throughout a portion of its length, as indioatedat H8, so as to lay down a broken stripe of adhesive llla. (Fig. 8). The web is carried by a conveyor 9 under the rolls I I6 and I I! and past a cutter member I20, which cuts the web into sheets l2l (Fig. 8). A highspeed conveyor l22 carries each sheet over folding' rolls I23 and in the path of movement of a form. In the present instance, this is one of a series of forms I24 carried on an endless conveyor I25. The sheet l2l moves over the rolls I23 with the stripe of dry adhesive Illa at the forward edge of the sheet, and each form is recessed as indicated at l 26, so that the form will not contact the stripe. Each form carries a stop plate I23 at its inner end. As each form moves between the rolls I23, the ends of the sheet are folded upwardly about the form, and as the form moves downwardly, these ends are held in folded position by plates I21, I28, I29 and I3II. In order to bend down the unglued, upper end of the sheet, there is provided a reciprocating roll I3I carried on arms I32 from a suitably operated shaft I33. The roll I3I moves inwardly between the plates I28 and I30 and moves the unglued, upper end of the sheet against the top of the form and then moves rapidly away from the form. Slightly below the roll I3I (Fig. '7) there is provided a similarly operated roll I34 carried on arms I36 from a shaft I36 having a similarly reciprocal action imparted thereto. The roll I34 acts to fold over the glued, upper end of the sheet into overlapping relationship with the unglued upper end of the sheet, and to seal it thereagainst. Desirably, in most instances, the roll I34 will be a heated roll. It is to be noted that the forms I24 are of such size that, when the sheet is against the stop plate I23, the edge thereof carrying the broken stripe of adhesive H10. projects beyond the outer end of the form. In order to fold this edge inwardly and to seal the bottom of the bag, there are provided side folding plates I31 and I38 adapted to act successively to fold in the unglued portion of the edge and to fold a portion of the edge which carries adhesive stripe 111 into overlapping relationship-therewith. The plates I31 and I33 are carried, respectively, on shafts I39 and I40, to which a properly timed, reciprocal action is imparted by any well known or suitable mechanism. The upstanding tabs on the bottom of the bag are thereupon closed. To effect this action, there is provided a plate I44 having an upturned end I for bending over the forward tab, and an arm I42 carried on a rotating shaft I43 for bending forward the rearward tab at a time such that it also will move under the plate I44. Desirably. there is provided a heated plate I45 which may be part of, or independent of, the plate I44 for the purpose of sealing the tabs and the overlapping portions at the bottom of the bag. The bag so formed may be removed and inserted into a carton manually or by suitable mechanism, or a carton may be formed around the bag on the form I24 as it continues in its course in a manner well known in the art, and lined carton suitably removed. The bags or lined cartons thus formed may be filled and sealed, as by pressing together certain portions of the dry adhesive'along' I I la.

It may be noted in this connection that the expression top of the bag as used herein indicates the end of the bag which is open after the bag is formed, regardless of the position of the bag at any particular stage in the operation.

In Fig. 8, m illustrates the sheet I21. ready for folding. The sheet is shown after the action of the roll I23 at n, of the roll I3I at o, of the roll I34 at p, of the plate I31 "at q, of the plate I 33 at r, and of the plate I44 at s. The finished bag,

after the final action of the arm I42, the plate I44 and the plate I46, is shown at t.

There are certain difficulties attendant upon apparatus which applies the type of adhesive described in my copendingapplication and referred to above. Whenever rollers, which have this adhesive on them, stand for even a short length of time in the air, a crust of dry adhesive forms on them. It has been found preferable to use .trough 2 I 1 and immediately but a single roller to transfer the adhesive from the source of supply to the web. This arrangement is shown in Fig. 9 in which rollers 2III and 2H draw a web 2I2 from a roll 2I3 over Idlers or otherwise formed in the metallic surface of roller 2I'5. The design formed by areas 260 is the same as the desired design of the adhesive on each sheet to be' cut off from the web. For

example, collar portions 260 supply a continuous or almost continuous laterally extending stripe of adhesive along the edges of the web. A pair of axially extending areas 2" provide pairs of adhesive areas on the web extending at least in part transversely of the web (see Fig. 10).

If it is desired, a pressing roller 262 may press the web 2I2 against the adhesive-applying roller 2 I 5. The pressing roller may have protuberances which register with the adhesive-filled depressions of roller 2I5, at the point of contact with the web, the rollers being positioned about their respective axes and being geared to assure this registry.

Various idling

rollers

264 and 266 guide the web, after it has received the adhesive, to the drying plate 220, which is similar to plate 20 described above and similarly operated. Rollers so positioned that that web surface having the fresh,.undried adhesive must press against the roller surface, may be provided with depressions which register with the areas of undried adhesive as the web passes over these rollers. Thelastmentioned rollers may be geared so that the pattern of the adhesive on the web and of the depressions are in registry. Successive sheets may be cut oiffrom the web by means of a rotary cutter 231.

Sheets cut off from a web, like the one shown in Fig. 10, may be supplied to any suitable bagforming mechanism, for example, the bag-forming mechanism in Fig. 1. In those cases where the transverse stripes extend only partly across the web, the elements which press the sheets around the form may be heated to assist in attaching the dry adhesive to some other portion of the sheet which does not have the special dry adhesive thereon.'

Figs. 12-15 show a modification of the apparatus, which modification applies and dries adhesive on both surfaces of a web. Such a web is shown in Fig. 16. A single unit or sheet cut from that web is shown, in Fig. 18, in successive formations as it is folded into a bag, the first change in shape being shown on a somewhat larger scale in Fig. 1'1.

The machine shown in Fig. 12 has, in addition to the elements shown in Fig. 9, an adhesive container 3" through which the surface of an adhesive-applying roller 3IIi passes. A scraper 3I6 removes the excess adhesive. Roller 3I5 carries the liquid adhesive from the container to of the web. This distance may be substantially equal to the depth of the bags to be made. Stripes 268 may extend from the other edge-such a distance that their ends are in registry with a portion of the stripes 235236 on the opposite surface of the web.

After leaving the second adhesive-applying roller, the web is subjected to the action of a second drying plate 320 which is similar in its action to the drying plate shown in Fig. 1. The mechanical linkages which operate plate may operate plate 320.

A cutter 231. separates the-advancing web into sheets by cutting transversely of the web and between the

adjacent stripes

235 and 236 and centrally along stripes 268 or between stripes 268 if they are applied as slightly separated'pairs.

Each sheet, after it is cut, is carried by a high speed conveyor 38a. over folding rollers 39 under a form which, in the present instance, consists of a plunger 40 operated in synchronism with the elements by any known or suitable mechanism. The plunger serves to press thesheet between the rolls 39 so as to fold the side portions of the sheets upwardly to provide what may be called the sides 13 and I2 of the bag. Positioned adjacent the path of the plunger and beyond the rolls 39 are additional folding members 210. The latter may be small rollers, each of which bend up portions It, 18, and 80 of the sheet against oneof the other two vertical walls of the plungerv so as to provide the bottom of what may be called the end or seamed sides of the bag. As will be seen from Fig. 17, each long stripe 268, originally on the underside of the sheet, now extends downwardly on the outside and along the edge of one side wall 10, horizontally inward and along the upper edge of the fold 18 (which is flat against and parallel to side 13), horizontally along the upper edge of the outside surface of the lower part 14 of the side to be seamed, and finally horizontally outward along the upper edge of the fold 80 (which is flat against side 12) as is shown in Fig. 17 and at bin Fig. 18. I

The plunger next carries the folded sheet between additional folding. members 4| and 42, which move successively against the plunger and fold inwardly the right and left hand parts 82 i and 84 of the upstanding side portion of the sheet,

which side portion has stripes 268 on the outside (see Fig. 18, c) ,and then the right and left hand parts 36 and 88 of the upstanding side portion of the sheet which has

stripes

235 and 236 on the inside (see' Fig. 18, d). Members 4| and 42 may be heated, although it is not necessary when the special dry adhesive is pressed against another.

area which has the same type of adhesive thereon.

This causes those horizontal length of stripe 288 at the top'edges' of

flaps

18 and 80 to fold onto the horizontal length of stripe 288 at the top of 14. Stripe 235 overlies one stripe 283 and stripe 238 overlies the other stripe 288. Parts 32 and 88 form one seemed side of the bag. Parts 34 and 38 form the other seamed part of the bag. Pressure, with or without heat, by members 4| and 42,

- at the seam, with the lower surface new and desire to secure by Letters Patent is:

causes all these overlying stripes to hold the bag in folded condition. All of the seams are firm and moisture-proof. At any time after filling, the bag may be sealed by pressing together, while dry, the top edges of the bag so that, for example, stripes 2l8 and 2| 9 are in contact.

If it is desired, the transverse, stripes of adhesive may extend substantially across the web. If

copending application is used, for the complete cross or transverse stripes, it is not necessary that the bag-forming operations take place immediately before the adhesive dries, nor is it necessary to reactivate the dry adhesive before pressing one part of a stripe against'another part of the same or some other stripe. After any convenient time and at any convenient place, the web may be severed and the bags formed by pressing the dry adhesive in one position on a sheet against other dry adhesive in another properly chosen position on the same sheet. Added heat or reactivating agents are unnecessary. The material of the web may have originally been surfaced on one or both sides with material to give a smooth, glossy surface, e. g., wax. The seam up the side of the bag may be any form of overlapping; such, for example, as a union of two adjacent margins in the nature of a suture. Should the transverse dimension of the web be too small to give a deep enough bag, the separate sheets from the web may be caused to enter the bag-forming mechanism so oriented relatively thereto that stripes which'were longitudinal 'of the web are positioned at the side of the bag, and stripes which were transversemay be used, after the bag is filled, to seal the top of the bag.

Fig. 19 shows a web with adhesive applied as just described with longitudinal stripes 318 and '3l9, and transverse stripes 335 and- 336. The

same figure shows the, various steps in the folding of a sheet, from such a web, into a bag with a suture-like seam. The folding members 4| and 42, instead of folding successively, push in simultaneously to bind the material of the bag into a suture edge, as clearly shown in the formation steps a, b, cud, e and I. When two L.-shaped elements are joined together with the outside surfaces of the two shorter arms of the elements in contact with each other, the'seam thus formed is termed a suture. The word "suture in this specification and these claims refers to such a seam. In a suture, those surfaces of two joined elements; whichform a substantially continuous surface in the compound product, are the surfaces which are in contact. Thus, if the two elements are in general horizontal, no part of the upper surface of one element is in contact, of the other element.

Since certain changes in carrying out the above process and in the constructions set forth which embody theinventionmay be made without departing from its scope, it is intended that all matter contained in 'the'above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended to cover all the generic and specific features of the invention herein described, and all statements of the scope of the invention -which. as a. matter of language, might be said to fall therebetween. I Having described my invention, what I claim as .the adhesive described in my above-mentioned,

1. Bag-forming apparatus comprising means to apply transverse stripes of adhesive to a web, means to dry said adhesive, means to separate the web into sheets along lines with said transverse stripes of adhesive on either side thereof, means' to wrap said sheet into contact with a form with said transverse stripes juxtaposed to other edge portions of said sheet to form a seam leading toward the open end of the bag to be formed, and means to press the portions carrying said transverse stripes against said other portions to provide a seal.

.2. Bag-forming apparatus comprising means to apply stripes of a wet adhesive to the edges-of a web, means to apply transverse stripes of adhesive to the web, means to dry said adhesive, means to separate the web into sheets along lines with transverse stripes of adhesive on either side thereof, means adapted for maintaining said adhesive in dry condition, means to wrap said sheet around a form with said transverse stripes contacting other edge. portions of said sheet while said stripes are still dry, and means to press the portions carrying said transverse stripes against said otherportion to provide a seal.

3. Bag-forming apparatus comprising means to apply stripes of wet adhesive to the edges of the web, means to dry said adhesive, means to apply transverse stripes of adhesive to the web after the first-mentioned stripes have been dried, means to separate the web into sheets along the lines with transverse stripes of adhesive on either side thereof, means to shape said sheets so that said transverse stripes contact other portions of said sheet, and means to press the portions carrying said transverse stripesagainst said other portions to provide a seal.

4. Bag-forming apparatus comprising means to apply a wet adhesive in stripe form at a suitable position on a web, means to apply wet adhesive in stripe form at another position on the web, means to dry at least part of the applied adhesive, means to separate the web into sheets, a form, means to wrap a sheet around said form so that certain portions of said sheets contact each other and so thatvat least some of said contacting portions have said dried adhesive thereon in dry condition and so that certain other portions having said dried adhesive thereon are not in contact with each other and are in such a position relative to each other that they may later be placed in contact with each other, and means to seal said some portions.

5. Bag-forming apparatus comprising means to apply a wet adhesive in stripe form at a suitable position on a web, means to apply wet adhesive in stripe form at another position on the web, means to dry at least part of the applied adhesive, means to separate the web into sheets, a form, means to p a sheet around said form so that certain portions of said sheet overlap and so that at least some of said overlapping portions have said dried adhesive thereon in dry condition and so that certain other portions having said dried adhesive thereon are not in contact with each other and are in such a position relative to each other that they may later be placed in contact with each other,

and means to seal said some overlapping portions, and so that said last-mentioned portions of said dry adhesive lie along the side seamsof the bag as wrapped around said form.

6. Bag-forming apparatus comprising means to apply wet adhesive in stripe form at a suitable position on a sheet, means to apphr wet adhesive in stripe form at another position on said sheet,

means to dry at least part of the applied adhesive, means to wrap said sheet around a form so that certain portions of said sheet overlap and so that at least some of said overlapping portions have said dried adhesive thereon and so that certain other portions having said dried adhesive thereon are not in contact with each other and are in such a position relative to each other that they I may later be placed in contact with each other, and means to seal said overlapping portions with- .out moistening the same.

'7. Bag-forming apparatus comprising means to apply wet adhesive in stripe form at a suitable position on a sheet, means to apply wet adhesive in stripe form at another position on said sheet, means to dry said adhesive, means to fold said sheet into bag form so that certain portions of said adhesive remain exposed at the top of said bag and so that certain portions of said sheet overlap and so that at least some of said overlapping portions have said dried adhesive thereon, and means to seal said overlapping portions without moistening the same.

8. Bag-forming apparatus comprising mechanical means adapted for applying astripe of dry adhesive longitudinally of a web, mechanical means adapted for -applying adhesive onto said web in transverse stripes, mechanical means adapted for then separating said web into sheets, and mechanical means adapted for then forming said sheets into bags with said last-mentioned stripes along and holding the seams together and with said stripe of dry adhesive so placed that after the bag has been filled the said stripe of dry adhesive may be availed of to seal the bag into a package.

9. Bag-forming apparatus comprising means adapted for applying adhesive to one surface of a web, means adapted for drying said adhesive, means adapted for applying adhesive to the other surface of said web after'said first adhesive is dry, means adapted for separating said web into sheets, and means adapted for forming said sheets into bags secured'by said adhesive.

10. The method of forming a bag comprising applying spaced longitudinal stripes of adhesive to one surface of a web, applying stripes on each surface of said web and transversely to said web, I

separating said web into sheets, folding each of said sheets into a bag with said longitudinal spaced stripes along the top.

11. The method of forming bags which comprises providing a stripe of dry adhesive on at least one side of a web, applying adhesive on said web in transverse stripes, drying said adhesive,

transversely separating the web into sheets along lines-with adhesive on either side of said lines of separation, forming each sheet into bag shape with the two, opposite, side edges of the web at the top of each respective bag and sealing the edges adjacent said lines of separation.

12. The method of forming bags comprising applying to a web adhesive in transverse stripes, said stripes extending at least part way across said web, drying said adhesive, transversely separating the web into sheets along lines of separation having portions of said adhesive on either side.

oi said lines, forming each sheet into a bag with the'side edges of the web at the top of the bag, and sealing the edges adjacent said lines by the application of heat.

13. The method of forming bags comprising applying to a web adhesive in transverse stripes, said stripes extending at least part way across said web, drying saidadheslve, transversely separating the web into sheets along lines of separation having portions of said adhesive on either at the inside and with the portions carrying adhesive applied by the second applying means overlapping other surfaces of the sheet, and means to seal the overlapping portions, said form being recessed at the end adjacent the top of the bag to prevent contact of said dry adhesive with' said form at least at points over which said sealing means act;

15. Bag-forming apparatus comprising a form adapted-to receive thereagainst material which is to be formed into a bag and which has adhesive on at least a part thereof, pressure means positioned to be resisted by said form and adapted for sealing said material to itself, said form havmeans to wrap a sheet around saidform and to cause edge portions of the sheet to overlap, sealing means, means to cause relative movement of the sealing means and said form to bring the sealing means against said overlapping edge portions to seal the same, said form being recessed at one end where said sealing means would press said sheet against said formwere said form not recessed, to prevent contact of part of the inner surface of the wrapped sheet with the form when the outer surface thereof is in contact with said sealing means, and means to cause said operations to be repeated to wrap and seal other sheets on said form after the removal of each bag formed thereon.

17. Bag-forming apparatus comprising a plunger, means to deliver sheets in the path of movement of the plunger, means to fold the ends of each sheet upwardly over the plunger, means to overlap the lateral edge portions of the said ends of the sheet, and means to seal the overlapping portions, said plunger being recessed at its rearward end on a line forwardly of the rear edges of the sheet at least at the points at which said sealing means act.

18. Bag-forming apparatus comprising an endless conveyor, an endless series of forms projecting radially from said conveyor, each form being recessed at its inner end, means to move individual sheets into the path of movement of individual forms with an end of the sheet extending past the recessed portion of the form, and means to wrap each sheet around a form and to seal the overla ping edge portions, and means to last-mentioned adhesive carrying means, means for operating the webcarrying means, means for applying a'wet adhesive to portions of the web while it is moved by the web-carrying means, a hot plate beyondthe applying means for drying the adhesive, means for moving the hot plate out of position when the movement of the web-carrying means is halted, means to separate the web into sheets, and means to form a bag out of each sheet.

20. Bag-forming apparatus comprising means to apply stripes of a wet adhesive to the. edges of a web, means to dry said adhesive, means'to apply transverse stripes of adhesive to the web, means to separate the web into sheets along lines with transverse stripes of adhesive on either side thereof, means to wrap said sheet into bag shape and around av form and with said transverse stripes overlapping other edge portions of said sheet, and means to press the portions carrying said transverse stripes against said other portions to provide a'seal, said wrapping and pressing means being adapted to form open bags without utilizing the first-mentioned adhesive.

21. Bag-forming apparatus comprising means to apply stripes of a wet adhesive to at least one edge of the web, means to dry said adhesive, means to apply transverse stripes of adhesive to the web, means to separate the web into sheets along lines with transverse stripes of adhesive on either side thereof, a plunger, means to move each sheet in the path of the plunger, folding means in the path of movement of the plunger, means to turn the edge portions, of the sheet and having thereon said transverse stripes, inwardly to cause them during the continued movement of the plunger to overlap and become the side seams of-the bag to be formed, and a pair of sealing members beyond the last-mentioned means in the path of move ment of. the plunger arranged to turn up the tabs and to seal the overlapping edge portions of the 22. Bag-forming apparatus comprising means to apply stripes of adhesive to a web, means to dry the stripes, means to apply other stripes of adhesive on the web, means to separate the web into sheets with the stripe of'dried adhesive at one edge thereof, and the other stripes at certain other edge portions, a continuously moving series of forms, means to project each sheet adjacent one of said forms with said stripe of dry adhesive forwardly, means to wrap the sheet about said form with an edge portion of the sheet carrying the latterly applied adhesive overlapping another edge portion of the sheet, means to seal said overlapping edge portions, means to form and seal the end of a bag opposite the end carrying said stripe of dried adhesive, means adapted to prevent the means for sealing the overlapping portions from contacting the sheet with the form along the surface carrying said dry adhesive, said last-mentioned means including a recess in said form.

23. The method of forming packages, which comprises -pr ovidinga stripe of dry adhesive on one surface adjacent one edge of a sheet, adhesive being provided elsewhere on the sheet for use in the formation of a bag from the sheet but not on the opposite surface adjacent said edge, forming the sheet into abag with said stripe of dry adhesive on the inside of, and along, the top of the bag, whereby said stripe is in a position for finally. sealing the top of said has without the reactivat-