US2663981A

US2663981A - Paper container

Info

Publication number: US2663981A
Application number: US176860A
Authority: US
Inventors: Roy S Sanford
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-07-31
Filing date: 1950-07-31
Publication date: 1953-12-29
Anticipated expiration: 1970-12-29

Description

R. s. SANFORD 2,663,981

PAPER CONTAINER Dec. 29, 1953 Filed July 51, 1950 2 Sheets-Sheet l z'xi- INVEFH'OR Rqy S. Sanford.

XML 1M ATTORNEYS Dec. 29, 1953 s, SANFORD 1 2,663,981 I PAPER CONTAINER Filed July 31, 1950 2 Sheets-Sheet 2 INVENTOR Roy SSQI wr ATTORNEYS Patented Dec. 29, 1953.

PAPER CONTAINER Roy S. Sanford, Oakville, Conn. Application July 31, 1950, Serial No. 176,860

9 Claims.

This invention relates to containers of paperboard or other sheet material, and more particularly to a novel liquid-tight and sift-proof container and to a means and method for making the same.

One of the objects of the present invention is to provide a novel paper container blank which is readily adapted for quick and eificient sealing at both ends, the construction being such that complete sealing of all pin holes and cracks is achieved, thus providing a container having end portions which are completely air-tight, when used for liquids, or sift-proof when employed for powdered materials.

Another object is to provide a closure for the upper end of a tubular container, so constituted as to permit portions of the container forming the end closure to be adhesively bonded together at a relatively high pressure sufiicient to effect a positive fiow of adhesive between the portions to fill and seal all cracks and openings therebetween at the container end.

A further object is to provide a novel closure for the upper end of a container of the above type, so constituted as to facilitate the filling of the container and the subsequent sealing of the end thereof.

Still another object is to provide a container of the above type having separate dispensing and filling openings so arranged as to facilitate the filling of the container and the subsequent dispensin of the material therein.

Yet another object is to provide a container of the above type having separate filling and dispensing openings and closure means therefor, and so constituted as to permit closing and sealing of the dispensing opening prior to-filling of'the container, and subsequent sealing of the filling opening, thus providing a container having a sanitary dispensing opening which remains sealed not only during the filling operation but until the dispensing opening is uncovered to dispense the contents of the container.

A further object is to provide a sanitary liquidtight and sift-proof container having separate dispensing and filling openings and formed from a single piece of sheet material such as paperboard.

Another object is to provide acontainer of the above type having a fillin opening adapted to be temporarily closed and sealed to permit sanitary shipment with the container empty, and adapted to be readily opened for filling and to be subsequently permanently sealed.

still another O j ct Q e invention is to provide, in connection with a container having filling and dispensing openings and closure means therefor, a novel means and method for closing said dispensing opening while leaving the closure means for the filling opening in open position.

A further object of the invention is to provide a means and method of effecting initial temporary and subsequent final sealing of a closure member on a container so constituted as to permit the temporary seal to be broken without damage to the container and to permit a permanent final seal to be effected thereafter.

Yet another object is to provide a blank for a container of the above type having a closure flap for a filling opening hingedly secured to a portion of the blank and secured to but readily detachable from another portion of the blank to permit handling of the blank without damage to tions of the dispensing opening closure means after the latter is closed.

A further object is to provide, in connection with a container having a protective coating of paraffin or other thermoplastic material anda heat-scalable end closure, a novel means and method for substantially preventing said coating from melting and dropping into the interior of the container during the heat-sealing operation.

Another object is to provide, in connection with a container of the type having separately operable and hingedly connected dispensing and filling flaps, means for separately sealing said flaps and for insuring a seal along the hinge line therebetween.

Other objects and novel features of the inven-' tion will appear more fully hereinafter from the following detailed description when considered in connection with the accompanying drawings, wherein one embodiment of the invention is illustrated. It is to be expressly understood, however, that the drawings are utilized for purposes of illustration only, and are not to be taken as a definition of the limits of the invention, refer once being had for this purpose to the accompanying claims.

In the drawings, wherein similar reference characters refer to similar parts throughout the several views,

Fig. 1 is a plan view of a blank adapted to be formed into the novel container of the present invention;

Fig. 2 is a perspective view of a partially assembled container and mechanism for forming the container;

Fig. 3 is a perspective view showing a step in the formation of the end closure and mechanism for forming the end closure;

Fig. 4 is a perspective view of a container with the end closure partially completed;

Fig. 5 is a perspective view showing another step in the formation of the end closure and mechanism for forming the end closure;

Fig. 6 is a perspective view of the upper end of a container showing a completed end closure; and

Fig. '7 is a perspective view showing the mechanism of Fig. 5 in more complete detail.

The present invention is particularly directed to a means and method for forming and sealing a container of sheet material, the bottom end of the container being preferably closed and sealed as set forth more fully in the copending application of Roy S. Sanford and Wilfred A. Eaton, Serial No. 644,547 filed January 31, 1946, for Paper Container, now U. S. Patent No. 2,596,224, owned by the same assignee as the present application. The upper end of the container is in general preferably formed as set forth in the copending applications of Wilfred A. Eaton, Serial No. 671,832, filed May 23, 1946, for Paper Container, now U. S. Patent No. 2,596,225, and Roger H. Casler, Serial No. 699,750 filed September 2'7, 1946, for Dispensing Containers, now U. S. Patent No. 2,581,237, likewise owned by the same assignee as the present application, the instant application setting forth certain improvements in structures of the above type, as will be more fully described hereinafter.

Containers of the type shown and described in the instant application and in the above referred to applications are ordinarily formed and filled by means of automatic machines, and when such containers are used for mill; and similar products, it has been found desirable for sanitary reasons, to separate as completely as possible, the operations of forming the container from the operation of filling the container. such a result can be obtained by forming the container in one room and filling and closing the container in an entirely separate room, the formed containers being transported to the filling room by suitable conveyor means which may be so constructed as to conform with sanitary requirements. As will be shown, the container of the present application is particularly adapted to meet these requirements, as the container may be substantially completed before being filled, the only operations required after filling being those of closing and sealing a filling flap.

It is likewise desirable in some cases to form the containers and ship them empty to another place for filling, in which case they must be sealed during shipment to prevent contamination of the interior, and subsequently opened, filled, and rescaled. The present invention provides for thi contingency, in that the container may be formed and temporarily sealed at one place, and thereafter opened without damage to the container, filled, and ermanently sealed at another place, ready for distribution to the customer, it being noted in this connection that the dispensing opening, which is closed when the container is formed, is not disturbed in any way during the subsequent opening, filling and rescaling operation, and consequently is not subject to contamination before reaching the consumer.

Referring more particularly to Fig. l, the present invention is illustrated therein as including a container blank 4 divided by scored folding lines 5 into preferably rectangular wall panels 5, I, 8, and 9, the panel 6 being provided with a glue flap I0 adapted to be adhesively secured to panel 5, which may be provided with a coating of adhesive I I along the lower edge thereof for that purpose, As set forth in the copending application of Roy S. Sanford and Wilfred A. Eaton, above referred to, the wall panels 6 and 8 are provided at their left ends with integral halffiaps I2 and I3, while the panels 1 and 9 are provided with full flaps l4 and IS, the flaps 12, i3, and l4, l5, thus being in opposed relationship when the container is assembled. Flaps l2 and i3 are provided with scored lines I6 and I! which divide the half flaps into separate panels of the same shape and substantially equal area, the inner surfaces of flaps l2 and i3 having a coating I 8 of a fiowable adhesive. The inner surface of flap i5 is provided with a similar adhesive coating 19 and the flap i4 is provided with narrow strips of adhesive coating 20. The blank is formed into a tube and the bottom closed and sealed as described in the above referred to application of Sanford and Eaton, the two panels of the half-flaps being folded together and inside of the container with their adhesively coated surfaces together and the flaps l4 and I5 being folded thereover and subjected to pressure to bond all of the flaps together and to force adhesive outwardly between the two panels of the half flaps toward the side walls and corners of the container to seal all openings therebetween.

Referring to the right hand portion of Fig. l, a score line 2| defines, in cooperation with angularly disposed

score lines

22, 23, 24 and 25, substantially isosceles trapezoidal shaped panels 26 and 2'1, and adjacent substantially triangular panels 28. Additional score lines 23a and 29 and a partially out line 30 define, in conjunction with score lines 5 and 2|, rectangular panels 3! and 32. Other angularly disposed

score lines

33, 34, and 36 define, in connection with score lines 5, 2|, and a score line 31, isosceles trapezoidal panels 38 and adjacent triangular panels 39, while the

score lines

5, 2 I, and 31 define a pair of rectangular panels 39a.

Top closure flaps

40 and 4| are provided, and are preferably formed integral with an adjacent to panels 3| and 32 respectively, and hingedly secured thereto along score lines 28a and 29. The flap 40 has an opening 42 provided with a dispensing portion or opening 43 and a preferably enlarged filling portion or opening 44. While the openings 43 and 44 form portions of a single opening 42 in the form illustrated, it will be understood that if desired, the openings 43 and 44 may be separately formed in the flap 40, in which event, a narrow web or bridge may separate the two openings. The outer closure flap M is adapted when folded to overly and close the opening 42, and is provided with a'tear strip or dispensing port forming member 45 separable from the flap 4| as along perforations 46, and adapted to cover the dispensing portion 43 of opening 42 when the flap 4! is in closed position. The separable member is preferably provided with an opening tab 41 extending therefrom, and having scored

folding lines

48 and 49 dividing the tab into

portions

50 and 5|. A score line 52 is provided substantially along the median line of flap 4|, thus dividing the latter into integral and hingedly connected portions 53 and 54. The portion 54 is separated from panel 32 by the out line 39, but in order to facilitate handling the blank, a small piece of paper 55 is left uncut to provide a separable connection or web between panel 32 and portion 54 of the flap 4|.

The

panels

26, 21, 28, 3| and 32 and the upper end of the glue flap ID are provided with an adhesive coating 56 as shown, and a strip of adhesive 51 is provided about the outer edge of closure flap 40 having a width approximately the same as that of the adhesive strip 56: A U-shaped strip of adhesive 58 of similar width is provided on flap 4|, the shapeof this stripbeing preferably such that there is no adhesive on the tear strip 45 or the perforations 46, although adhesive may be applied around the entire periphery of the flap if desired. While it is contemplated that the adhesive coatings |8, |9, 26, 56, 51 and 58 will be of the heat sealing type printed on the blanks in the pattern shown and dried before shipment, it will be understood that other types of adhesive may be used, and that if desired, the adhesive may be applied to selected areas of the blank during the various steps of forming a container from the blank in order to adhesively secure the parts as above described.

.Assuming that the glue flap ID has been adhesively secured to the wall panel 9 and the bottom flaps 2, I3, I4 and I5 folded and sealed to form a tubular container as described, the container is placed in a forming machine 59, partially shown in Fig. 2 with the lower end thereof resting on a suitable support, not shown. The machine is provided with a pair of relatively movable opposed slides 66 and another pair of opposed slides 6| arranged as shown, together with' a vertically movable plunger 62 adapted to fit into the open end of thecontainer and engage the interior surfaces of the panels 26, 21, 3| and 32. In forming the container top, the plunger 62 is partially entered into the mouth of the container, and the

slides

66 and 6| are moved inwardly substantially simultaneously, engaging the walls of the container adjacent score line 2|, and

folding panels

38, 39 and 39a inwardly, while

panels

26, 21, 28, 3| and 32 are folded outwardly with respect thereto, due to the engagement of the edges of plunger 62 with the inner surfaces of panels 26, 21, 3| and 32. This operation serves to break the scores between the adjacent panels and to partially preform the upper end of the container, thus facilitating the final closing and sealing operations.

The container is now removed from the preforming machine 59, whereupon the flap 40 is folded inwardly with the adhesive coating strip 51 adjacent panels 26, 21, 3| and 32. The flap 4| is then folded in overlapping relationship with flap 46, and the tab 41 is folded inwardly substantially at right angles to the flap 4|. The flap 54 is moved upwardly about score line 52 with sulficient force to break the connecting piece of paperboard 55, and with the flap 54 held in a substantially vertical position, the container is placed on a sealing machine 63, as shown in Fig. 3, the latter being provided with a pair of opposed slides 64, and another pair of opposed slides 65, arranged in a manner similar to the

slides

60 and 6| in the machine 59. A vertically movable sealing plunger 66 is provided with a die member 61 adaptedto engage the upp r surface ofportion 53 of flap 4|, and is also provided withanother die member 68 adapted to engage the portion of flap 46 not. covered by flap portion 53, a slot 69 being provided therebetween to reoeivethe vertically extending flap 54; As shown, the level of the lower surface of plunger portion 61 is slightly higher than that of plunger portion 68 in order to compensate for the thickness of the flap 54 to provide uniform pressure on the flaps during the sealing operation. The

slides

64 and 65 are moved inwardly to again

fold panels

38, 39 and 39a inwardly and panels 26, 21, and 2 8 outwardly as heretofore described, the plunger 66 thereafter being moved downwardly to engage flap 46 wi th flange forming panels 26, 21, 3| and 32, andto engage flap 4| with flap 46, it being understood that one of the slides 65 engages tab 41 to tuck the portion 56 thereof under the flange forming panel 2'|,as more fully described in the above referred to copending application of Roger H. Casler. In the event an adhesive of theheatsealing type is used, the,

slides

64 and 65 are provided with heating elements 70 and H respectively, while portions 61 and 68 of plunger 66 are provided with

heating elements

12 and 73,- The

slides

64 and 65 having been moved inwardly, serve to support the flange forming panels, and on downward movement of plunger 66 by suitable means, not shown, heat and pressure are applied to the flange forming panels and

flaps

40 and 4| to effect a secure bond between the engaging portions thereof and to positively flow the adhesive to seal and fill all openings therebetween. In the event other types of adhesive are utilized, it will be understood that the seal or bond between the above mentioned panels and flaps may be effected by pressure exerted by the plunger 66. Also inthe event the adhesive is of the type requiring the action of heat to facilitate drying and setting, the slides or plunger or both may be heater by suitable means for this purpose.

Following the above described operations, the container is substantially in the form shown in Fig. 4, with the flap portion 54 extending'upwardly and leaving port 44 open. In the event the container is to be coated with a protective material, it may be coated by dipping manually, or by automatic machinery, not shown, in a bath of molten wax or other suitable coating material, the latter being applied to the interior of the container and drained therefrom through the opening 44, and applied to the exterior by the operation of dipping the container in the bath. Thus the entire container is provided with a coating 14 and in the event wax or other thermoplastic material is utilized, it will be apparent that the adhesive coating 58 on flap 54 will have an overlying coating of a different thermoplastic heat scalable material which is preferably so ,chosen as to be heat sealable at a lower temperature than the adhesive coating 56, for purposes to be more fully described hereinafter. In any event, it is desirable that the adhesive coating 58 and the protective coating 74 be so chosen as to be capable of effecting bonds between flap 46 and of fact that the portion 53 sorifia l Ina-51 a]? ready been adhesiv-ely-seeured to Etherv fiat send ipo'r on crane hontainer-iorn iedby "the flange panels :26, 2 1 3'la1ld;'32, and by the -fiap 40, all *of thefinteriorly-exposed portions of the jfiap i53 arid the se arable dispensing port rormin memh will recei've a-eoating cf the protectivema'iteral, thus insuring that the 'portions thereof w ichare exposed to the container contents are erbvidea with a sanit"any 'proteotive ocating; In

the event no adhsive isapplied to the under surface of the tear strip 55, the coating material 't'"'"ds t'd-fill and seal openings between this ii) and the nap 4o','u ms insuring a leakproof iosur a; swell as a protective coarnew the outer surface of nap 40 adjacent the SEl-lfa-G f the 't'ai Strip 45 and around the dispensing port;

Sanitary reasons that "i1 0 be allowed to C01- leot on the outer surface of "the dispensing closure flap 4i andadia'eent areas, nd particularly adjacent the strip 45 and the 'perforations 3E. The upwardl extending flap 54 performs an important function in this oonnection, in "that it provides an' fictiveshield between the filling opening and the outer surfac'ek af flap 53 to prevent splashing of liquid on the latter from the region of the filling opening during the filling operation V V V The final "closing nd sealing is aocomplished by folding the flap i downwardly against flap "4! to'cove-r' opening 44; "and placing the 'upp er'end of ch'e'ccniaine dn a suitable mahine 'ifi, shown in Fig. Zfto effect sealing of the closure flap. The 'machine BJinay 'be provided with a :U- shaped lowerliie isaeapted to receive the upper 'endfo'fthe. conta ner and 'to' support the flange rorining paneis 26, 3] and 32, and a similarly shaped upper dief'fl movable by suitable 'means vertioally'with respect to the die 1s. with the nap *54 raises ro ciosing =po'sition, the too'of t'he container is ovd ifitor'thedie 16 with the flapil toward the' rear and the tab 41 at the front of tnecomainer as shownin Fig. '5, whereuponthed-i fl! "is moved downwardly to force the-nap 54 against the "upper surfaceof flap-c0 itoeifect a bond and"seal therehetween. In -the event the adhesive 'iltilized is of a heat-sealing type, a hea'ting element 18 maybe provided 'in -the=die 11. If foundfiesirable, a similar heater, not shown, may he provided for the lower die 16. -In order to insane complete sealing of the flap filtofiap "40, the "'di'es are so arranged as; to apply pressure across'and on 'bothsides of the hinge s'cor'e'lin'e 52. ltis also to beunderstood thatthese dies,'as well as the s1ides-'and plunger of machine 63, areso contoured as to compensate for the number of layers of paperboard material being bonded in clifierent areas, in order to insure adequate 'b'onding'pressuresbetween all surfaces. Since the portion '53 of flap M has previously been bondedto flap AG, andsince the 'u'ishaped ldiesapply pressure to the freepedges of flap'ilandiacross'the hinge line 52 it 'will'be the bath of coating material.

apparent that aftennllihg of the "container, the flap 55 may be readily sealed alongi-ts periphery and along the hinge line to prevent leakage from the container, this heing accomplished without disturbing the closure of the dispensing 'ope'ning, which has already been effected by the portion 53 of flap 4! as described. 7

In the event the coating material is par'aflin or some other low melting point material, and in the "event an adhesive of the-heat sealing type is employed in adhesively securing the flap i5! to the flap 40 to effect a final closure, it is desirable to localize the application of heat to the flap 54 during the heat sealing operation in order to prevent the coating from melting and drop ping into the container. Due to the-employ"- ment of the U shaped heated die 'Tlfwh'ich engages only the peripheral portion'of the 'flap fil, the heat is localized and melting of the coating is substantially eliminated.

As heretofore stated, it may sometimes be found desirable to form and coat the container,

and thereafter 'se'al it temporarily'to permit shipment empty to another location for filling and subsequent rescaling, the interior of the empty container being protected against contamination during shipment so as to avoid the need for sterilizing prior to filling. The present container is well adapted to this type 'ofoperation, the container in the form shown in Fig. '4 having its interior coated with wax or other suitable protective material through the opening 44, and the exterior preferably bein'gsiinilarly coated by the operation of dipping the container in Assuming that wax is used as the coating material, the coating is set by cooling in a suitable refrigerator, resulting in -a container coated with wax, and including a 'coatingof wax over the adhesive band 58 enclosure fiap 5'4. The wax'norrn'ally used for suohcoatings hasa lower melting point than the adhesive 58, thus 'permitting softening of the wax coating for heat sealing at a temperat-ure below that required to activate the-adhesive i38-for-heat sealing, and so low-as to leave the adhesive 58 substantially unafiected. The temporary closure may be affected in substantially the same manner'as the final closure heretofore describedthe 'upperportion of the container being placed between dies of a machine of the type shown in Fig.1? with the fiap'iid folded down against the "flap 4!). The heater H3 is so chosen or adjusted as to heat the diell 'siifficiently to soften the Wax coating over the adhesive 58 and on the uppe'r -surface offiap 40 sufficiently to soften or render the Wax'ooatirig tacky without disturbing the adhesive coating 58, the parts being pressed together by the op eration ofthe dies du'ring or after the softening operation to effect/a temporary "bond therebetween, which in the event the protective "coating is of'wax oro'ther suitable material, 'is's'trong enough tomaintain and seal the flap"?! in'closed position, but is not strong enough to damage the container during subsequent reopening of theclosure flap. Inthe event itis'found necessary to cool the waxcoating to insure a good bond, this may be accomplished by cooling 'the dies while maintaining pressure onthe ,fla-p's, .or by removing the container to another similar machine having dies maintained at a proper temperature to rapidly'cool the wax while holding the parts in engagement.

The contai r is ow rea y f sh pm nt empty to a filling stat n, Wh re th container can be reopened for filling by lifting the flap 54 and breaking the relatively weak bond betweenthe flap 54 and fiap 40. Subsequent to the filling operation, the container is placed in a machine of the type shown in Fig. '7 having dies maintained at a temperature suitable for activating the adhesive 58, and the final closure made by heat and pressure as previously described. In order to facilitate reopening the flap 54 and breaking the temporary wax seal, a cut-out 19 may be provided at the upper edge of panel 26 and a corresponding cut-out 80 on the edge of fiap 40, as shown in Fig. 1. When the top is formed and sealed, these cut-outs are substantially in register so as to expose a portion 8| of the outer edge of flap 54, thus permitting the latter to be grasped or acted on by a suitable tool to break the wax seal and lift the fiap to permit filling of the container.

From the foregoing, it will be seen that the present invention provides a novel blank and container structure which may be readily formed in a single piece from paperboard or other similar sheet material. Furthermore,it will be apparent that as shown in the drawings, and particularly in Fig. 6, a finished container is formed having a top closure which presents a substantially fiat and unbroken or non-recessed outer surface having distinctive advantages from a sanitation standpoint when used for the packaging of food products such as milk, for example. It will also be noted that the closure member presenting this flat unbroken outer surface includes not only a tab separable therefrom to provide a dispensing opening, but also a separate fiap which, prior to closing, is adapted to provide access to a filling opening for the container which is entirely separate and distinct from the dispensing opening. A protected dispensing opening is provided which may be sealed prior to filling of the container, and which remains undisturbed during the subsequent filling operation. The construction is such that the container may be substantially completely assembled in one room and filled in another room, the only operations performed in the filling room being those of filling, closing the filler flap, and sealing the latter, thus greatly minimizing the possibility of contaminating the product with which the container is filled. The container is also readily adapted for temporary sealing, and subsequent opening, filling, and resealing, a procedure which is often highly desirable.

While one form of the container has been shown, and described herein with considerable particularity, it will be understood by those skilled in the art that various modifications may be resorted to without departing from the spirit of the invention. For example, in some instances the fiap 40 may be dispensed with entirely if desired, in which case the portions 53 and 54 of closure fiap 4| may be adhesively secured to the flat end of the container formed by the

flange forming panels

26, 21, 3i and 32, rather than to the fiat end formed by securing the flap 40 to the flange forming panels. Other modifications may also be resorted to within the scope of the invention.

This application is a division of the copending application of Roy S. Sanford, Serial No. 783,904, filed November 4, 1947, for Paper Container.

Reference will, therefore, be had to the apmaterial, which comprises preparing a blank of sheet material having a plurality of side wall panels provided with foldable end closing flaps at the bottom end thereof, flange forming panels at the upper ends thereof, a top closure flap integral with one flange forming panel provided,

with ported dispensing and filling portions, and a second top closure flap integral with another flange forming panel having a portion provided with a tear strip and another portion hingedly secured thereto, folding said 'blank and adhesively securing adjacent wall panels together to form a tube of polygonal cross section, folding and adhesively securing said foldable end flaps together in overlapping relationship to form a bottom closure, folding upper portions of said wall panels inwardly and said flange forming panels outwardly to form a substantially continuous fiange about the upper end of the container, folding and adhesively securing the first'named top closure flap to said flange and substantially simultaneously folding and adhesively securing the first named portion'of the second top closure flap to the first named top closure flap with said tear strip covering the ported dispensing portion of the first named top closure fiap and with the second named portion of the second top closure flap in open position, introducing a coating material into the container through the ported filling portion of the first named top closure flap and draining the coating material from the container therethrough, setting the coating material, filling the container with a desired product through said ported filling portion, and closing and adhesively securing the second named portion of the second top flap to the first named top fiap to close and seal the ported filling portion thereof.

2. The method of forming, coating, filling, and sealing the end of a tubular container of sheet material, which comprisespreparing a blank of said material having a plurality of side wall panels, foldable bottom closing flaps at one end of the side wall panels, flange forming panels at the other ends of said wall panels, a first top flap integral with one of said flange forming panels having a ported filling portion and a ported dispensing portion, and a second top flap provided with a, portion having a tear strip and a second portion hingedly connected thereto, applying a coating of heat scalable adhesive to selected portions of said blank, setting said adhesive coating, folding said blank into a-ftubular form with a pair of side wall panels in "engagement and applying heat and pressure to effect a bond therebetween, folding said bottom closing flaps in overlapping relationship with adhesive coated surfaces in engagement and. applying heat and pressure to effect a bondtherebetween and to close the bottom end of said container, folding upper portions of said wallipanels inwardly and said flange forming panelsoutwardly to form a substantially continuous flange about the upper end of said container, folding said first top flap with an adhesive coated surface in engagement with said flange and substantially simultaneously folding the first named portion of said second top flap with an adhesive coated surface in engagement with the upper surface of the first top flap and with the second named portion of the second top fiap extending upwardly, applying heat and pressure to effect a bond between said first top flap and flange and between said fiap and the first named portionof the second top flap while holding the other portion thereof in said upwardly extending position, dipping said container-in abath' orco'ating material whereby the hingedly connected portion of the second top flapinto engagement with the top of the first top flap to cover the ported filling portion thereof, and applying heat and, pressure to the hingedly con nected portion to effect an adhesive bond betweensaid portion and said first top flap to seal the top of said container.

3. The method of temporarily sealing, reopen ing, filling, and rescaling a. tubular paper board container of sheet material and of the type having an end closure member provided with a filling port and an end closure flapv provided with a coating of heat scalable material and adapted to be bonded to said member to close said port, which comprises covering said first named coating with a second coating. of a relatively weak heat scalable material heat scalable at a lower temperature than the first named material, engaging said fiap and member and applying heat in a degree sufiicient to render the second named coating operative to effect a bond between said flap and member and insuflicient to render said first named coating operative to efiect a bond therebetween, subsequently breaking the first named bond, opening. said flap, and filling the container with a desired product through said port, and thereafter again engaging said flap and member and applying heat in a degree s-ufficient to render the first named coating operative to effect a bond between said flap and member. 7

i, The method or coatingptemporarily closing and sealing, reopening and filling, and rescaling a container of sheetmaterial and of the type having a ported closure member and a cooperating closure flap provided witha coating of heatsealable adhesive, which comprises coating the container, including said adhesively coated flap, with a thermoplastic material heat scalable in a temperature range below that of said adhesive, closing said flap and applying heat thereto in a degree sufficient to render said thermos-plastic material operative to efifect a bond between said member and flap and insufficient to render said adhesive operative to eiTect a bond therebetween, subsequently breaking said bond, opening said flap and filling said container with a desired product through said port, and closing said flap and applying heat thereto in a degree sufficient to render said adhesive operative to effect a bond etween said fiap and member.

5. The method of temporarily sealing, reopening, filling, and rescaling a container of sheet material and of the type having a closure member provided with a filling port and an end closure fiap provided with a coating of heat sealable adhesive and an overlying coating of thermo-plastic material heat scalable in a temperature range below the heat sealing temperature range of said adhesive, which comprises closing said flap and applying heat thereto in a degree suiiicient to render said therm'o-plastic material operative to efiect a bond between said fiap and member to close an'diseal saidport,subsequently breaking said bond, opening said flap and filling said container through said port with a desired product, and thereafter reclosing said flap. and

applying: heat thereto. in a. degree sufficient. to.

render said adhesiveoperative to efiect a bond between said. fiapand. member to close and. seal said port.

6. The method of temporarily sealing, reopening, filling, and rescaling a container of sheet materialand of the type including a closure mem:

ber having a. filling port and closure flap having a coating of heat scalable adhesive, comprising applying a coating of relatively weak adhesive.

over said coating of heat sealableadhesive on said. flap, closing said flap over said member and applying pressureto. render said, relatively weak adhesive. operative to effect a bond between said flap and member toclose and seal said port, sub sequently breaking said bond, opening said flap and filling said container with a desired product through said port, and thereafter again closing said flapand applying heat thereto in a degree sufiicient to render said heat scalable adhesive operative to efiect a bond between said flap and member.

7. The method of temporarily sealing, reopenin filling, and rescaling a container of sheet material and of the type having a closure flap having a coating of heat scalable adhesive and adapted to be adhesively secured to the end of the container to close the same, comprising applying a, coating of relatively weak adhesive over said coating of heat scalable adhesive, engaging said flap with the end of said container to render said weak adhesive operative to effeet a bond between said fiap and container to temporarily close and seal the end thereof, subsequently breaking said bond and filling said container through the open end thereof, and thereafter again engaging said fiap with the end of said container and applying heat to said flap in a degree sufficient to render said heat scalable adhesive operative to efiect a permanent bond between. said flap and the end of said container.

8. The method of preparing for filling a tubular container of polygonal cross section and of the type having a flange at one end thereof, an end closure fiap provided with a dispensing tab separable therefrom adapted to be secured to said flange to cover one portion of said container end and a filler flap integral with and hingedly connected with the first named nap and adapted to close the remaining portion of the container end, which comprises adhesively securing selected portions of the first named flap to said flange, while leaving said separable dispensing member unsecured to said flange and maintaining said filler flap in open position, applying a liquid protective coating to said container 'to effect a seal between the unsecured portion of said separable dispensing portion and the adjacent flange, and thereafter setting said protective coating.

9. The method of forming, coating, filling and sealing the end of a rectangular paper container of the type having four side walls each provided with a flange at one end thereof, said flanges forming a continuous outwardly extending marginal flange, a first rectangular and closure flap integral with one wall flange and having ported dispensing and filling portions, and a second rectangular end closure flap integral with the wall'flange opposite said one wall flange and having a dispensing tear strip separable therefrom and a filler fiap hingedly secured thereto, which comprises adhesively securing the marginal portion of the first flap ing and adhesively securing said filler flap to t sa d marginal fla adh s vcly securing the first flap to close and seal the filling portion. selected portions of the second flap to the top of ROY S. SANFORD. the first flap with the tear strip covering the ported dispensing portion of the first flap while 5 efe e ces Ci in e fi e Of this patent maintaining the filler flap open to provide access to the container through the ported filling UNITED STATES PATENTS portion of the first flap, introducing a coating Nugnner Name Date material into the container through said filling 85,979 Hothersau July 6, 1937 portion and draining the coating material from 10 2,218,670 Benflett Oct. 22, 1940 the container therethrough, setting the coating 232L042 Prels J1me material, filling the container with a desired 232L050 seymer June 3, 1943 product through said filling portion, and 0105- 2371917 Wilcox May 1949