US2488038A

US2488038A - Method of forming valve bags

Info

Publication number: US2488038A
Application number: US692569A
Authority: US
Inventors: William E Sharkey
Original assignee: RAYMOND BAG Co
Current assignee: RAYMOND BAG Co
Priority date: 1946-08-23
Filing date: 1946-08-23
Publication date: 1949-11-15
Anticipated expiration: 1966-11-15

Description

Nov. 15, 1949 w. E. SHARKEY METHOD OF FORMING VALVE BAGS 5 Sheets-Sheet l Filed Aug. 23, .1946

Nov. l5, 1949 lW. E. SHARKEY METHOD OF FORMING VALVE BAGS',

5 sheets-sneu 2 Filed Aug. 23, 1946- INVENTOR.

Nov. 15, 1949 w. E. HARM-:Y 2,488,038

METHOD OF FORMING VALVE BAGS Filed Aug. 25, 1946 3 Sheets-*Sheet 3 IN V EN TORL mn-M,

Patented Nov. 15, 1949 William` E.

Sharkey; Middletown,

Ohio; assignor to The Raymond Bag Company, Middletovmfr,A Ohio, a. corporation ofA Ohio' Application August 23, 1946, Serial No. 692,569

1-1 Claims;

This invention relates toa sleeve fory a bag valve and to the method of inserting said sleevel in the bag.

' It is 4customary'to provide bags of certain types,

such as' cementbags and-v the like, Wit-hf valvesA through which a llin'g' spout may be insertedl and which will be closedV by the pressure of thel contents ofthe filled bag when the latter is in'-V verted'. 4 Suela bags are usually made of heavy paper, or like material; andY are often of the multi-ply type. When the valve is formedA by folding in Ya corner portion of the bag the stiffness of the materialV from which'the bag is formedis such as to frequently prevent theA walls of the valve from being pressed; into sufciently tight Contact one with the other tov prevent fine material from seeping through the val-ve; I n an elTort to prevent such leakage it has beenA common practice to provide the valvev with a supple'-I mental closure or Vsleeve of highly flexible material, such as soft paper; which ismore-completely crushed' by the contents of the bag than is the valve itself. While such sleeveshave materially reduced leakage it has been found difficult to devise a sleevev which will entirely prevent theescape of material through the valve, particularlywhen that material is of' a very fine character. Further, theV insertion of the sleeve requires an' additional operation', usually a` hand'v operation', at an intermediate stage in the manufacture of the bag',` andv thus retards andl increases the cost of' production;

One object of theinventionis to provide a valve prevent leakage more eiectively sleeve which will than it is prevented by existing sleeves;

A further object of the invention is to pro-A vide a valve sleeve which can be inserted mel chanically during the-usual manufacturing-proc*- ess.

A further object of the invention is Vto providek an efficient and rapid' method of insertingl the sleeveV during the manufacture of the bag.

A further object of the invention is to pro` vide such` a method by which the' sleeve mayl beinserted during the usualmanufacturing process without modification of the latter, and which will requirel very little additional equipment.

Other objects of the invention may-'appearas the sleeve and the method of insertingthesame are described in detail.

In the accompanying drawings Fig. 1 is a per-- spective view of thev upper end portion of a bag equipped with the improvedV valve sleeve, the upper end of thebag being open; Fig. 2 is aV section taken on the line `2`2v of Fig. 1*; Fig.

l ingY folded inwardlyA ,between a' vertical section taken through the valve-cornerl of: sucha bag; showing the saine' closed prior to filling; Fig; 4 isf' a perspective view of' a com--d pleted' bag; showing the positions of the va-lveY and sleeve" after` the bag' has *been4 ll'edi and i113- veitfe Fig'. 5 is a plan viewof a' at section* of bag material, show' form ofthe' improved; .sleeve and` various steps el the preferred method' of inserting the same'. A valve/d bag" is usually of the multi"ply-' type; butfor ciearnessofillustration have hereshown the sleeve as appliejdtoja' single ply-bag, it' being understood that this single p'ly would correspond' to the innermost ply'ofa' multi-ply bag and that the valve of a multi-ply bag would' have' the sam'ennmber'of plies as the walls of the-bag;

' vIii Fijg. 1" `th'erei's shown the` valveI corner por` tion ofy a'- bag comprising sidewalls *Il andl l, the` valve forming' portion whichv has 'been foldedy inwardly between the side wallsto'iorm the'val've'4 l2- Thebagis V-cjo'krnplete except' for theV connectof' the upper edge' portions thereof to closeA the' bag; the' sideu walls being'A spaced" slightlyY onethe'- other to more' clearly illustrate the construction. -The present bagis of" the gusseted` type, each of the' verticaljedge walls thereof'be the` `side walls to provide a gusset I3, as shown inFigs. 4;:...6A and'; andV thevalveforming portion of thebag includL ingv the -end* portion of the gusset at one edge of the bag'.

VY"The sleeve;comprisestwosectionsor strips, llll use@ to bale: which' is' ,uriner-V taneular ign fom, kof a 11 the Vertical width Qf .considerably .greater side walls, preferably by' p'eciive side' lillge Operation Each sleeve the inner end of the valve. The outer ends of the sleeve sections extend outwardly between the sides of the valve and the respective side walls of the bag and are preferably attached to the adjacent side walls of the valve, as by pasting. Thus the sleeve offers no intereference with the discharge of material into the bag from a filling spout inserted through the valve. The sleeve sections being connected with the side walls at their upper edges only and being connected with the valve adjacent to their outer ends it will be apparent that the inner lower portions of the sleeve sections, which constitute the major portions thereof, are unattached and are free to move with relation one to the other and to the side walls. Consequently when the bag has been filled and is inverted the contents of the bag will crush the free portions of the sleeve sections one upon the other, and will also crush the valve, somewhat in the manner shown in Fig. 4. The sleeve sections are pressed into such tight engagement one with the other as to very effectively prevent any seepage of material between the sleeve sections, and inasmuch as the outer ends of the sleeve sections extend beyond the inner end of the valve there can be no seepage through the valve.

The sleeve sections are inserted during the manufacture of the bag by attaching the edge portions thereof to the respective side walls prior to the folding of the valve, the sleeve sections being arranged in such positions on opposite sides of the valve forming portions of the bag material that they will be properly located with relation to the valve when the latter has been formed. Preferably, paste is applied to those portions of the bag material which are to form the sides of the valves before the valve is folded, so that the pasted portions thereof will be brought into contact with and caused to adhere to the respective sleeve sections during the valve forming operation.

The usual method of manufacturing a bag of this type comprises feeding a web, or webs, from a roll, or rolls, of bag forming material, such as heavy paper, and folding each web on longitudinal fold lines to form a substantially at continuous tube, the edge portions of which are folded inwardly to form the gussets. In the case of a multi-ply bag each outer web is folded about the inner web or webs so as to form a plurality of nested tubes. The longitudinal edge portions of each tube overlap and are pasted one to the other during the forming operation. The tube thus formed is then severed into sections of bag length. The forming and severing of the tube may be accomplished by any suitable mechanism, such as that shown in the Sharkey and Thompson Patent No. 2,038,452 of April 21, 1936. One corner of each bag section is then folded inwardly between the side walls of the bag section to form the valve. This may be accomplished manually but the valve is preferably tucked by a machine, such as that shown in my Patent No. 2,205,633 of June 25, 1940. The bag section with the tucked valve is then delivered, preferably directly, from the tucking machine to a sewing machine which sews the end portions of the side walls of the bag section one to the other, at both ends of the bag section, thereby closing the bag except for the valve opening. A sewing machine suitable for this purpose is shown in my Patent No. 1,915,765 of June 27, 1933.

rllhe sleeve is inserted in the bag during these forming operations, without in any way retarding or interfering with the same. Preferably, the sections of sleeve material are applied to the web of material I6, from which the bag is to be formed, prior to the folding of the web into tubular form. The location of the tube severing mechanism with relation to the web predetermines the transverse lines on which the tube is to be severed, and consequently there are predetermined lines of severance along the flat web, although there is no marking on the web to indicate these lines. In Fig. 6 one line of severance has been indicated on the web at I'I by a dotted line, and this line has a forwardly offset portion to provide the bag section with a tab I8 which forms a part of the valve forming portion of the material, to increase the length of the valve. The valve forming portion of the material, including the tab I8 and the adjacent portion of the web in the rear of the tab, is so located on the web that one of the longitudinal fold lines extends through the same, so that the several valve forming portions of the web will be folded into the gusset at one edge of the tube. Sleeve sections, I4 and I5, are attached to the web adjacent each line of severance and on opposite sides of the valve forming portion of the web, which is in the rear of the line of severance when the valve portion is at the forward end of the bag section. The two sleeve sections may be the end portions of a single strip of material and may be so applied to the web, but to facilitate the folding of the valve it is preferable that the sections be separated and applied to the web on opposite sides of the valve forming portion of the web, as herein illustrated. These sleeve sections may be applied to the web in any suitable manner, but preferably suitable mechanism is provided for forming the sleeve sections, applying paste along the edges thereof and placing the same on the web. The mechanism for so forming and applying the sleeve sections is not a part of the present invention and is not here shown except that I have shown sleeve applying rollers I9 contacting the moving web above a portion thereof which is supported in a horizontal portion, as by a roll 20. In Fig. 5 there is shown a section of the web I6 in a flat condition and severed along the line II, although the web is never severed while in the at condition. The dotted lines on this figure are the fold lines for the gusset I3 and for the valve I2, the pasted portions of the sleeve section being indicated at 2 I.

After each bag section has been severed from the continuous tube it passes to the tucking machine and the gusset at the valve corner thereof isrextended, as by spreading wings 22, to fully extend the end portion 23 of the gusset, as shown in Fig. 7. While this valve forming portion of the gusset is in its extended position paste is applied to the inner surface thereof on opposite sides of the central fold line, as shown at 24, the paste applying means being shown conventionally at 25. The paste applying means are instantly withdrawn and the extended valve portionl is then folded inwardly along the central fold line to form the valve I2, as shown in Fig. 1, thus bringing the sides of the valve to which paste has been applied into contact with the end portions of the respective sleeve sections. As the bag section passes from the tucking machine the side walls thereof are the other and the ends of the sleeve sections are caused to adheretightly to the valve.

After the sleeve sections have been so applied pressed tightly one against.

and the valve formed the bast section passes through the sewing machine which closes the ends thereof, the line of stitching at the upper end of the bag extending through both the side walls and the pasted-edge portions of the sleeve sections. Thus the upper portions of the sleeve sections are pressed into and retained in tight contact one with the other, thereby closing the upper edge of the sleeve and completing the bag.

While I have shown and described one form of my improved sleeve and one method of inserting the same in the bag, I wish it to be understood that I do not desire to be limited to the details thereof as various modifications may occur to a person skilled in the art.

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

1. The method of inserting a valve sleeve in a valved bag which comprises securing edge portions of two sections of sleeve forming material to the inner surfaces of the respective side walls of the bag, before the valve is formed, adjacent to the valve ends of said side walls and on opposite sides of that portion of the bag material from which the valve is tobe formed, and folding the valve between the outer end portions only of said sections so that said sections extend inwardly beyond said valve.

2. The method of inserting a valve sleeve in a valved bag which comprises securing two sections of sleeve forming material to the inner surfaces of the respective side walls of the bag before the valve is formed, and in such positions that the formed valve will extend between the outer end portions only of said sections of sleeve forming material, and securing said end portions of said sections to the valve during the valve forming operation.

3. The method of inserting a valve sleeve in a valved bag which comprises securing edge portions of two sections of sleeve forming material to the inner surfaces of the respective side walls of the bag, before the valve is formed, adjacent the valve ends of said side walls and on opposite sides of that portion of the bag material from which the valve is to be formed, folding the valve between the end portion of said sleeve sections and securing said end portions of said side walls one to the other.

4. The method of inserting a valve sleeve in a valved bag which comprises pasting longitudinal edge portions of two sections of sleeve forming material to the upper portions of the inner end portions of the respective side walls of the bag before the valve is formed and on opposite sides of that portion of the bag material from which the valve is to be formed, applying paste to those portions of said bag material which are to form the sides of the valve, folding said valve between said sections of sleeve material and causing the pasted sides of said valve to adhere to the respective sleeve sections.

5. The method of inserting a valve sleeve in a valved bag which comprises securing edge portions of two sections of sleeve forming material to the edge portion of a substantially flat section of bag forming material and on opposite sides of the valve forming portion of said bag material, forming said bag material into a flat tubular bag section with said valve portion at one corner thereof, folding said valve portion between the ends of said sleeve sections, and securing the valve ends of the side walls of said bag section one to the other with said edge portions other 6. The method of inserting a. valve sleeve in. af

valved bag which comprises advancing a section of bag material having a portion from which a valve is to. be formed, securing edge portions. of two strips of sleeve forming material to said section of bag material on opposite sidesof said valve forming portion ofthe latter, forming said section of bag material into a substantially at tubular bag section with said valve forming portion at one corner of said bag section, folding said valve forming portion into said bag section to form the valve,` with the inner end of the valve between said strips of sleeve material, and Securing the valve ends of the side walls of said bag section one to the other with theattached-edge portions of said strips of sleeve material in contact one with the other..

7. The method of inserting a valve sleeve in a valved bag which comprises advancing a section of bag material having a portion from which a. valve is to be formed, securing edge portions of two strips of sleeve forming material to saidl section of bag: material on opposite sides ofv said valve forming portion of the latter, forming said section of bag material into a substantially flat tubularbag section with said valve forming portion at one corner of said; bag section, folding said valve` form-ing portion into said bag section to form the valve, connecting the endr portions of, said strips of sleeve material with said valve and sewing the valve ends of said side walls of said bag section one to the other by a seam extend.- ing through said edge portions of said strips of sleeve material.

i3. The method of inserting a valve sleeve ina valved bag which comprises continuously advancing a web of bag material having predetermined transverse lines of severance and having adjacent each line of severance a portion from which a valve is to be formed, attaching edge portions of two strips of sleeve forming material to said web adjacent each line of severance and on opposite sides of and adjacent to the valve forming portion of said web,Y folding said web on longitudinal 1inesone of which extends through said valve forming portions, to form a substantially iiat continuous tube with said strips of material within said tube, severing said tube on said lines of severance into bag sections, each having a valve forming portion at one corner thereof, folding said valve forming portion of each bag section between the side walls of the latter to form a valve, and connecting the adjacent ends of said side walls to complete the bag and to close the same except for the opening through said valve.

9. The method of inserting a valve sleeve in a valved bag which comprises continuously advancing a web of bag material having predetermined transverse lines of severance and having adjacent each line of severance a portion from which a valve is to be formed, attaching edge portions of two strips of sleeve forming material to said web adjacent each line of severance and on opposite sides of the adjacent valve forming portion of said web, folding said web on longitudinal lines, one of which extends through said valve forming portions, to form a substantially at continuous tube with said strips of material within said tube, severing said tube on said lines of severance into bag sections, each having a valve forming portion at one corner thereof, folding said valve forming portion of each bag sec tion between the? side walls of the latter to form a valve, connecting the inner portion of said valve with the adjacent ends of said strips of sleeve material, and connecting the adjacent ends of said side walls to complete the bag and to close the same except for the opening through said valve.

10. The method of inserting a valve sleeve in a valved bag which comprises continuously ad vancing a web of bag material having predetermined transverse lines of severance and having adjacent each line of severance a portion from which a valve is to be formed, pasting edge portions of two strips of sleeve forming material to said web on a line adjacent to and substantially parallel with each line of severance, folding the lateral portions of said web upwardly and inwardly about parallel fold lines to form a substantially fiat continuous tube, one of said folded lines extending through said valve forming portions of said bag material, severing said tube on said line-s of severance into bag sections each having a valve forming portion at one corner thereof, folding the valve portion of each bag section between the side Walls of the latter to form a valve, pasting the sides of said valve to the adjacent ends of the respective strips of sleeve material, and connectingthose ends of said lside walls which are adjacent said valve one to the other to secure the attached edge portions of said strips of sleeve material in tight contact one with the other.

11. The method of inserting a valve sleeve in a valved bag which comprises continuously advancing a web of bag material having predetermined transverse lines of severance and having adjacent each line of severance a portion from which a valve is to be formed, pasting longitudinal edge portions of two substantially rectangular strips of sleeve forming material to said web on a line adjacent to and substantially parallel with each line of severance, folding the lateral portions of said web upwardly and inwardly about parallel fold lines to form a Isubstantially flat continuous tube having a gusset in each lateral edge thereof and with said valve forming portions in one of said gussets, severing said tube on said lines of severance into bag sections, each having a valve forming portion at one corner thereof, extending the valve end of the gusset of each bag section, applying paste to the inner surface of the extended valve forming portion of said gusset, folding said extended portion between the side walls of said bag ysection and between the end portions of said strips of sleeve material to form a valve and to cause said strips to adhere to said valve, and sewing together the valve ends of said yside walls and the pasted end portions of said strips.

WILLIAM E. SHARKEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,852,026 Redington Apr. 5, 1932 1,949,879 Potdevin Mar. 6, 1934 2,060,451 Steen Nov. 10, 1936 2,275,505 Crawford et al Mar. 10, 1942 2,392,094 Lee Jan. 1, 1946