US2292403A - Method of producing fiber containers - Google Patents

Description

Augo ll, 1942;

J. F. PETERS METHOD OF PRODUCING FIBER CONTAINERS Filed Jan. 18, 1959 3 Sheets-Sheet 1 d6 INVENTOR.

BY M /ATTORNEYS Aug. 11, 1942. J. F. PETERS 2,292,403

METHOD 0F PRODUCING FIBER CONTAINERS I Filed Jan. 18, 1959 s sheets-sheet 2 INVENTOR. },Z. a 0 14: BY m 1 15 5 W 4 ATTORNEYS A118. J. F. PETERS METHOD OF PRODUCING FIBER CONTAINERS Filed Jan. 18, 1939 I5 Sheets-Sheet 5 INVENTOR.

: ATTORNEYS Patented Aug. 11. 1942 METHOD OF PRODUCING FIBER CONTAINERS John F. Peters, Leonia, N. 1., assignor to American Can Company, New York, N. Y., a corporation of New Jersey Application January 18, 1939, Serial No. 251,621

9 Claims.

The invention relates to single service fiber containers for holding comestibles, such as frozen food products, and to the method of producing such a container.

An important object of the invention is to provide asingle service fiber container which is composed of few parts and in which the bodyis of single or one-piece-construction, with provision made for adequately reenforcing-and ad'- hesively" securing togetherv the corner portions of the container without the necessity of providing separate parts or open joint lines or seams.

A further object-of the invention'is to provide an improved method for creasing the container body blank and applying a thermo-plastic adhesive to'predetermined areas of the same at localities. where. adhesive connections, are decontainer body construction.) Fig. 2 is a" plan view of the completed fiber body blank in the fiat, the same being in readisired in further forming the container from such- I a body blank by folding the same along such imparted predetermined fold or crease lines.

Astill further object of the invention is to provide in a container of the character described means for applying melted paraflln or other waxlike material to opposite surfaces of a moving web from whichsuccessive container body blanks I are ,cut .or blanked. The method further includes novel means forimmediately chilling the applied parafiin during movement of the web and without requiring separate or remote chilling or drying operations.

A still further object of the invention is to provide a method of forming one-piece single service fiber container blanks from a moving Web of material after crease lines have been imparted to the web and after a thermo-plastic adhesive has been applied to localized portions only on opposite surfaces of the creased web.

hesively applied cover being loosened or separated from the container body.

Numerous other objects and advantages of the invention will be apparent as it is better understood from the following description, which, taken in connection with the accompanying drawings, discloses a preferred embodiment thereof.

In said drawings,

Fig. l is a perspective view of the completed fiber container with cover applied,- said view being partially broken away to better illustrate the ness to be folded and die shaped into final form illustrated in Fig. l.

Fig. Bis a plan view of .the cover blank in, the I hat and prior to beingdie-shaped and applied tothe upper open end of the container body.

Fig. 4 is a detail view in perspective illustrating the manner of tucking in one of the corner portions of the body blank. Fig. 5 is a detail perspective view of a come of the applied cover, said view being taken on "line 5+5 of Fig. 1.

A further object of the invention is to provide I a novel method of forming a completed container body from a prepared body blank and by subjecting the latter to a simple die pressing operation.

A further object of the invention is to provide a novel and economical method of forming a container cover from a previously creased and notched cover blank on which adhesive has been applied at localized areas thereof, and applying such a formed cover to a. filled container body of the character contemplated by the invention.

The invention further includes novel and im- Fig. 6 a schematic perspective view, partially in vertical section, illustrating the entrance end of the apparatus for preparing the body blank illustrated in Fig. 2.

Fig. 7 is a similar view of the discharge end of the apparatus illustrated in Fig. 6, it being understood that Fig. 7 when placed at the right of Fig. 6 illustrates the complete apparatus for preparing the body blank from a fiber or paper web.

- Fig. 8 is a detail fragmentary horizontal section also somewhat schematic in character, said figure being taken on line t3 of Fig. 7.

Fig. 9 is a detail view in side elevation, partially in vertical section, illustrating the manproved means for rendering the cold adhesive ner of heating the pre-applied thermo-plastic adhesive of the fiat body blank preparatory to folding the same into completed body formation.

Fig. 10 is a perspective view of a portion of the forming device for tucking in the four corners of the body blank of Fig. 2 and for shaping the same into final form illustrated in Fig. 1.

Fig. 11 is a detail verical sectional view showing the manner of die shaping the cover from the fiat blank illustrated in Fig. 3.

Fig. 12 is a similar view showing the manner of heating the pre-applied cold thermo-plastic adhesive on the marginal edges of the cover.

Fig. 13 is a similar view illustrating the manher of die-pressing and squeezing the cover in position on a container body filled with the commodity to be packed and enclosed therein.

Referring to the drawings, and with particular reference to Figs. 1 to 5 inclusive, l0 indicates generally a one-piece body blank of oblong or rectangular configuration, preferably coated on both sides with pa'rafiin, and including a bottom panel or wall integrally formed opposite end walls l2 and side walls l3. The end walls are set off from the bottom wall by score or fold lines l4, while the side walls are similarly set off from the bottom as by fold or crease lines l5. The corner portions of the body blank are each set off from the side and end walls by crease or fold lines |6, |1 respectively, and constitute two identical triangular pleat or corner wall portions l8 and I9 separated by a score, crease or fold line 20. The companion triangular portions l8, I9 integrally formed with the side, end and body wall portions of the blank, when folded or tuckedinwardly along the lines l6, l1 and 20 constitute body reenforcing corner pleat walls of double thickness, as best seen at a in Fig. 1, and disposed at each corner of the container body.

Each triangular portion I8 of the body blank is provided on one side thereof with a chilled or dried area 2| of thermo-plastic adhesive, while the companion triangular portions I9 are similarly provided with such an area 22 of thermo-plastic adhesive, but on the opposite surface of such triangular portion of the blank. The configuration of the flat body blank of Fig. 2 is made by die cutting a fiber web after successive portions of the latter have been creased and provided with adhesive on localized opposite surfaces thereof and otherwise prepared to constitute the finished container body as hereinabove explained.

The cover blank is indicated generally at 23 and is of the same configuration as the body blank so as to snugly fit into engagement with the latter when the container is sealed. The

cover blank includes a top wall portion 24 and oppositely disposed side and end flanges 25 and 26 respectively set off by rectangular cut-away or notched corner portions indicated at b. The cover blank is preferably creased 0r scored in the flat at its side, end and corner portions respectively to provide side fold lines 21, 21a and 28, end fold lines 29, 29a and 30, and corner fold lines 3|, 32, at the described portions of the cover blank. The marginal side and end flanges of the cover are also preferably provided with co-extensive continuous areas indicated at 33 of pre-applied thermo-plastic adhesive, such as a vinyl acetate cement or the like.

The method and procedure for preparing and constructing the body blank illustrated in Fig. 2 will now be described, and for this purpose reference is made to Figs. 6 to inclusive.

In Fig. 6 there is shown a roll 34 of fiber, removably mounted as by trunnions 35 in a suitable bearing or bracket portion 36 of a machine frame, generally designated by the reference character 31. The web 38 of the roll is passed between suitable feed rollers 39 disposed on opposite sides of the web and driven by any suitable power source or inter-geared rolls, such gearing or driving mechanism not being illustrated and which may be of any preferred or desired character. From the feed rolls 39, the web passes between oppositely disposed creasing rollers 40, 40a, one of said rolls such as 40 having creasing ridges 4| thereon and the other of said rolls having similarly disposed creasing recesses 42 into which latter desired portions of the web are pressed by the ridges 4|, to impart to such web the desired side, end and corner crease lines hereinabove described, and which are best seen in the fiat body blank illustrated in Fig. 2. In other words, the roll 40 may be regarded as a male die member and the roll 40a a female die member driven in timed synchronization with one another so that the crease forming ridges 4| will accurately register with the creasing recesses 42 during the operation of the apparatus. The creasing rolls 40, 4001. may be of any desired size so as to impart to the web 38 suificient crease or fold lines at each revolution of the rolls to define one or a plurality of body blank sections to be subsequently severed and separated from the web.

After the web is creased, it is passed between an adhesive applying roller 43 partially submerged in a suitable bath 44 containing a liquid thermo-plastic adhesive, and a backing-up roller 45, both of said rollers being joumaled in the frame of the apparatus. The adhesive applying roll 43 may be provided with a suitable doctor blade 46 to remove surplus adhesive from the surface of the rotating roll, and a heating coil is schematically indicated at 41 through which hot oil, steam or hot water may be circulated in the tank or bath, to maintain the thermoplastic adhesive-in a fluid condition. The adhesive applying roll is suitably etched at localized portions of its periphery so as to apply adhesive to the moving web only at the triangular portions on one side of the latter indicated for example at 2| in Fig. 2.

The creased web with adhesive applied to localized portions of its lower surface is then passed over a suitable feed or guiding roller 48 suitably joumaled in the frame of the machine, and is thence passed between a second adhesive applying roller 49 having a doctor blade 50 and partially submerged in a tank or bath 5| of fluid thermo-plastic adhesive and similar in all respects to the bath 44. A heating coil 52, similar to the coil 41, is provided in the bath 5| for the circulation therethrough of a heating medium to maintain the adhesive at a relatively high temperature and in fluid condition. The adhesive applying roll 49 of course is also suitably journaled in the frame of the machine and, like the roll 43, is etched at localized spaced portions of its periphery so as to apply the triangular pertions of adhesive to the opposite side of the web, such triangular portions for example being indicated at 22 in Fig. 2.

The moving creased web 38 having localized areas of adhesive applied on opposite surfaces thereof is passed over suitable guide or feed rollers 53, 54 and 55, suitably joumaled in the machine frame, and is thence passed upwardly over a feeding and guiding roll 56 (Fig. 7) suitably journaled in the frame 31 of the apparatus. From the roll 56 the web is passed downwardly between companion paraffin coating rolls 51, 58, which apply melted paraflin or other suitable wax-like material to opposite surfaces of the web. To this end the roll 51 may be partially submerged in a tank or bath 59 of melted paraffin, which is maintained in a fluid condition by means of a heating coil schematically indicated at 60, and through which a heating medium such as steam, hot water or hot oil is circulated for this purpose. Similarly the paraflin applying and coating roll 58 is suitably journaled in the machine frame and is partially submerged in a bath iii of melted paraflin and also including a schematically illustrated heating coil 62, through which such a described heating medium is circulated.

The paraffin coated web is passed from the rolls and 58 over a feeding and guiding'r'oll 63 suitably journaled in the machine frame and preferably submerged in a tank 64 containing a cooling medium, for example cold water, which serves to immediately chill and set the applied paraffin on opposite surfaces of the web. The continuous circulation of the cooling medium in the tank 64 may be insured by cold water entrance and exit pipes 65 and 66 leading to and from the water cooling tank 64.

The cooled web is passed over a guide roller 61 and thence between upper and lower feed rollers 68, 69 to a vertically and horizontally re- 4 ciprocating punching and blanking die mechanism generally indicated by the reference character 10. Said mechanism comprises a vertically reciprocating blanking punch or head H movable between suitable guide members, said punch head being .reciprocated toward and away from the web by a mechanism, not shown, and which imparts movement to the head through a vertically extending stem member 12. The punch cooperates with a lower companion die member 13 and moves in timed relation with the movement of the web to successively separate and sever from the web the fiat body blank members l0.

During the punching operation the blanking head and-its lower die are also preferably moved or reciprocated horizontally in time with the movement of the web to facilitate the punching operation and to speed up production without necessitating temporarily holding the web stationary as the formed body blank is stamped therefrom. To this end the blank punch 1| and its lower die member 13 may be reciprocated or oscillated horizontally within a slideway' 14 by means of a rod 15 secured at one end to the blanking punch assembly and secured at its opposite end to a suitable crank or other reciprocating mechanism not shown. The severed body blanks l0 pass successively by gravity down an inclined chute I5 and thence are stacked as illustrated in a container or holder 11 from whence they may be removed as they accumulate to any desired place of deposit for the subsequent container body forming operation.

As best seen in Fig. 8, the blanking punch and die members are such as to form the corner portions of the body blank in a single operation at meeting edges of successive blanks without waste of material. For this purpose the corner forming die member 13 is of roughly triangular configuration to receive a mating portion of the punch member indicated at Ha in Fig. 8.

Prior to forming the blank into body shape, both surfaces of the blank are heated so that the triangular adhesive areas 2| and 22 will be made tacky. To this end and as best seen in Fig. 9, the web of material or punched out body blank is passed between a pair of upper and lower spaced chambers 18, I9, schematically illustrated in cross section in said figure, and through which chambers hot air or other heating medium is circulated by means of connecting pipes or conduits 80, 8|. The heat imparted to opposite surfaces of the web or blank softens the adhesive areas 2i and 22 and renders the body blank capable of being immediately thereafter formed into the completed container body illustrated in Fig. 1.

Fig. 10 illustrates a portion of a body forming mechanism for folding upwardly the end and side walls of the flat blank l0, and also tucking in the corner portions a thereof into an inwardly extending pleated wall of double thickness adhesively secured together and to one of the container walls at each corner of the container body. The body-forming device comprises an upper vertlcally reciprocating die member 82 and a lower stationary companion die member, indicated at 83. The upper die member is reciprocated from any source of power, not shown, as by means of a centrally disposed vertical stem 84. The lower stationary die member 83 includes oppositely disposed side walls 85 and end walls 86, each of double thickness, so as to provide for the circulation therethrough of a cooling medium 81, such as cold water, within such end and side forming walls of the lower die member. Cooling fluid entrance and exit pipes 88 and 89 may be provided to conduct the cooling fluid to and from the closed water jacket embodied in said die wall members of the stationary lower die.

The forming device further includes triangularly shaped corner die parts or sections 90, which operate to tuck in the corners of the container.

as the flat body blank of the latter is forced downwardly thereagainst by the upper die member 82.

It will be observed that the end die walls 86 are higher than the side die walls 85 with the resuit that when the container blank is positioned on the lower die member and engaged by the upper die member, the end walls i2 of the body blank are folded or wiped upwardly and inwardly on the fold lines l4 before the upper die carries the blank into engagement with the side walls 85, which latter thereafter fold or wipe upwardly and inwardly along the fold lines IS the sidewall members l3 of the container body. Prior to these side and end wall forming operations, thetriangular corner die parts 90 engage the fold or crease lines 20 at the corner portion of the blank, and tuck the same inwardly. This takes place immediately prior to the end and side walls being folded or wiped upwardly, as clearly seen from an inspection of Fig. 10. This is due to the corner die parts being of somewhat higher elevation than the end die walls 85, thereby initially bring-r inginto operation the tucking in function of such corner the parts.

Further downward movement of the upper die member 82 presses the nearly completed folded body blank out of the path of and below the engaging area of the corner die parts, thereby permitting the inwardly tucked corner pleats to be brought closely together as seen at a in Fig. 1. The adhesive areas being at such time warm and tacky results in the companion triangular corner wall portions l8 and I9 being securely bonded together and the moist adhesive area 2| or 22 on the opposite surface of the blank securely bonded to the adjacent side wall member iii of the formed container body. The upper die member 82 is suitably cut away as shown at 9| adiacent its corner portions to provide sufiicient clearance at this locality to accommodate the pleat of double thickness at the corner portions of thebody when the same is pressed and adhesively secured together and to an adjacent side or end body wall of the container.

The cooling action of the cold water within the die walls serves to immediately chill and set the tacky adhesive so that there will be no tendency of the adhesively secured corner wall portions of the blank to separate after the formed body is removed from between the forming die members.

From the foregoing, it will be seen that the invention contemplates novel and eflicient means for preparing and producing a fiber container body of one-piece construction, wherein provision is made for adequately reenforcing the corin Figs. 11 to 13 inclusive.

It will be understood that the container cover blank of Fig. 3 is notched at its comers, appropriately creased as indicated and described, and provided with a thermo-plastic adhesive along its marginal flanges, by the same method which has been illustrated and described with reference to preparing the body blank member. Therefore it is not deemed necessary to illustrate or further describe the preparation of the container cover blank. Minor variations in the creasing and adhesive applying rollers, as illustrated in Figs. 6 and 7 will be sufficient to enable the cover blanks to be prepared from a continuously moving web,'

as in the instance of the preparation of the container body blank illustrated in Fig. 2.

The creased cover blank with a cold adhesive applied to the marginal portions thereof is engaged between upper and lower die members 92 and 93 (Fig. 11) which serve to hold the marginal portions of the cover along the previously applied and described crease or fold lines, thereby providing in said cover a central panel portion 94 defined by an annular recess 95 having an upstanding wall portion 96 disposed between said recess and the adhesively coated marginal portions or flanges 25, 26 of the cover. This construction serves to reenforce and rigidify the cover and also render the same in readiness for application to the filled container.

Referring to Fig. 12, theformed cover is passed in proximity to a suitably disposed heating chamber 91 into which a heating medium, such as hot air, is conducted as through a pipe connection 98. Hot air from said chamber impinges against the lower adhesively coated surface of the cover flanges and 26, thereby softening said adhesive and rendering the same in a moist or tacky condition. Immediately thereafter the cover is applied to the filled container as illustrated in Fig. 13, and subjected to the action of companion forming and squeezing dies. An

. inner die member 99 enters into the annular recess 95 of the formed cover, substantially filling the same, while an outer die member I00 is moved inwardly against the cover flange to press the latter downwardly and tightly against the container body wall adjacent the open end. of the latter. The adhesive firmly secures said flanged portions of the cover to the body wall entirely around the container periphery to hermetically seal the receptacle and its contained product,

such for example as a frozen comestible IOI.

'A cooling fluid, preferably cold water, is circulated as by pipes I03, I04 and I05- through marginal chambers or portions l02' of the companion die members 99 and I00, thereby serving to immediately chill and set the adhesive as soon as the desired union between the cover and body parts has been effected and obtained.

From the foregoing it will be apparent that the invention contemplates the provision of an economical single service package for comestibles, such as frozen food products and the like, and also an improved method for preparing and sealing such package with its enclosed product. The entire package is composed of two parts since the body is of integral reenforced one-piece construction. The paraflin coating on the inner and outer walls of the container and its coverresults in a highly sterile container for the reception of a food product, since the temperature at which the melted paraffin is applied is sufficient to completely sterilize the fiber or paper of which the container is formed. The provision of such parafiin coating also materially augments the heat seal formed between the adhesively connected parts, thereby tending to render the filled container completely sterile, as well as resistant to moisture and entrance of atmosphere.

It is thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form,

construction, and arrangement of parts mentioned herein and in the steps and their order of accomplishment of the method described herein, without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the container and method hereinbefore described being merely a preferred embodiment of the invention.

I claim:

1. The method of producing one-piece fiber container bodies from a moving web of material, which consists in first creasing said web to form fold lines at predetermined portions thereof, successively applying localized areas of thermoplastic adhesive to said web on opposite surfaces thereof, blanking out successive portions of said moving web into fiat body blanks of one-piece construction, and then folding inwardly portions of said body blank along said formed crease lines to providea fiber container having end and side walls adhesively secured together.

2. The method of producing fiber containers from a continuously moving web of material, which consists in first creasing said web to form fold lines at predetermined portions thereof, successively applying localized areas of thermoplastic adhesive to said Web on opposite surfaces thereof, coating said web with a molten wax-like material, chilling and setting said wax-like coating by passing said web through a bath of cooling medium, blanking out successive portions of said moving web into flat body blanks of onepiece construction, folding inwardly portions of said body blank along said formed crease lines to provide a container having end and side walls, and tucking in corner portions of said body blank to provide inwardly extending reenforcing pleats of double thickness at said corner portions.

3. The method of producing one-piece single service fibercontainers, which consists in first creasing a moving web of fibrous material to form fold lines at predetermined portions thereof, successively applying localized areas of thermoplastic adhesive to said web on' opposite surfaces thereof, maintaining said adhesive in a fluent condition during application thereof, coating both sides of said web with molten paraffin,

maintaining by heat said paraflin in a molten condition to sterilize the fiber web, blanking out successive portions of said moving web into fiat body blanks of one-piece construction, folding inwardly portions of said body blank along said formed crease lines to provide container end and side walls, and tucking in creased corner portions of said body blank to provide inwardly extending adhesively coated reenforcing pleats of double thickness at said corner portions, heating said adhesive on said body blank at said corner partions to secure such portions firmly together in a completed container body of one-piece construction.

4. The method of producing fiber containers from a continuously moving web of material, which consists in first creasing said web to form fold lines at predetermined portions thereof, successively applying localized areas of thermo-plastic adhesive to said web on opposite surfaces thereof, maintaining said adhesive in a fluent conditions during application thereof, coatingboth sides of saidweb with molten parafiin, maintaining said parafiin in a molten condition to sterilize the'fiber web, chilling and setting said paraffin by passing said web through a bath of cooling medium, blanking out successive portions of said moving web into fiat body blanks ,of one-piece construction, folding inwardly portions of said body blank along said formed crease lines to provide container end and side walls, folding and tucking inwardly the corner portions of said body blank along other of said crease lines to provide inwardly extending adhesively coated reenforcing pleats of double thickness at said corner portions, heating said adhesive on said body blank at said corner portions and pressing such portions firmly together to adhesively secure the same to a container wall to provide a completed container body of one-piece construction.

5. The method of producing one-piece fiber container body blanks from a continuously moving web of material, which consists in first creasing said web to form fold lines at predetermined portions thereof including corner portions of the body blank, successively applying localized areas of thermo-plastic adhesive to said web on opposite surfaces thereof at said corner portions, maintaining said adhesive in a fluent condition during application thereof, coating said web with a molten wax-like material, maintaining by heat said wax-like material in a molten condition to sterilize the fiber web, chilling and setting said wax-like coating by passing said web through a bath of cooling medium, and blanking out successive portions of said moving web into flat body blank of one-piece construction having crease lines for subsequent folding of the same into completed container bodies of one-piece construction adhesively secured together at the corner portions thereof.

6. The method of producing one-piece fiber container bodies from a moving web of material, which consists in first creasing said' web to form fold lines at predetermined portions thereof, successively applying localized areas of thermo-plastic adhesive to said web on opposite surfaces thereof, blanking out successive portions of said moving web into fiat body blanks of onepiece construction, folding inwardly portions of said body blank along said formed crease lines to provide a fiber container having end and side walls adhesively secured together, notching, creasing and applying adhesive to localized portions of a fiber container closure blank, forming said closure blank into a completed container cover, rendering said cover adhesive tacky by the application of heat, and applying said cover to the filled container by a die-squeezing action to adhesively secure marginal portions of the (.over to the open end of the container body.

7. The method of producing fiber containers from a continuously moving web of material, which consists in first creasing said web to form fold lines at predetermined portions thereof, successively applying localized areas of thermoplastic adhesive to said web on opposite surfaces thereof, coating said web with a molten waxlike material, chilling and setting said wax-like coating by passing said web through a bath of cooling medium, blanking out successive portions of said moving web into fiat body blanks of one-piece construction, folding inwardly portions of said body blank along said formed crease lines to provide a container having end and side walls, tucking in corner portions of said body blank to provide inwardly extending reenforcing pleats of double thickness at said corner portions, notching, creasing and applying adhesive to localized portions of a fiber container closure blank, die-pressing said closure blank into a completed container cover, rendering said cover adhesive tacky by the application of heat, and applying said cover to the filled container by a die-squeezing action to adhesively secure marginal portions of the cover to the open end of the container body.

8. The method of producing one-piece single service fiber containers, which consists in first creasing a moving web of fibrous material to form fold lines at predetermined portions thereof, successively applying localized areas of thermo-plastic adhesive to said web on opposite surfaces thereof, maintaining said adhesive in a fluent condition during application thereof, coating both sides of said web with molten parafiin, maintaining said parafiin in a molten condition to sterilize the fiber web, blanking out successive portions of said moving web into flat body blanks of one-piece construction, folding inwardly portions of said body blank along said formed crease lines to provide container end andside walls, tucking in creased corner portions of said body blank to provide inwardly extending adhesively coated reenforcing pleats of double thickness at said corner portions, heating said adhesive on said body blank at said corner portions to secure such portions firmly together in a completed container body of one-piece construction, notching, creasing and applying adhesive to localized portions of a fiber container closure blank, forming said closure blank into a completed container cover. rendering said cover adhesive tacky by the application of heat, and applying said cover to the filled container by a die-squeezing action to adhesively secure marginal portions of the cover to the open end of the container body.

9. The method of producing fiber containers from a continuously moving web of material. which consists in first creasing said web to, form fold lines at predetermined portions thereof, successively applying localized areas of thermoplastic adhesive'to said web on opposite surfaces thereof, maintaining said adhesive in a fluent condition during application thereof, coating both sides of said web with molten paraffin,

a bath of cooling medium, blanking out successive portions of said moving web into flat body blanks of one-piece construction, folding inwardly portions of said body blank along said formed crease lines to provide container end and side walls, folding and tucking inwardly the corner portions of said body blank along other of said crease lines to provide inwardly extending adhe-

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