Patented June 29, 1948 2,444,143 ' UNITED STATES PATENT OFFICE 2,444,143: . PAPER BQ'I‘TLE CONSTRUCTION Frank D. Palmer, Ghicago, IlL, assignor to Frank D. Palmer, Inc, a corporation of Illinois Application February 8, 1946, Serial'No. 646,435 9 Claims. (01. 93-368) 7 i r This invention relates to an improvement in secured‘ thereto so as to form the blank ‘into a paper bottle construction and although suscept ible of other use, it has particular reference to rectangular tube. the construction of paper milk bottles. short ?aps 6 and '1 formed integrally with the wall panels 2 and 4 and, ?aps 8 and 9 respectively formed integrally with. the walls I and 3. The ?aps 6 and ‘I are ?rst folded inwardly, then the flap 9 and thereafterthe flap 8. The flap 9 is equipped with cut scoring indicated at Ill and One end‘ of the tube is closed by means of . Paper milk bottles havev already been quite widely adopted in the dairy industry but in the main, they have. been adopted only by the larger milk companies who are well able ?nancially to» procure the necessary paper bottle making equip ‘ ment, and who‘ have‘ the facilities for installing 10 H to form removable sections l2 and l3.‘ The flap 8. is equipped with out scoring Hi and operating such equipment together ‘with which cooperates with ‘a hinge formed "by a sterilizing equipment, usually in the form of paramning machinery and special ?lling ma crease l5 to form a hinged ear Hi which will over lie. the removable portion ll of the ‘?ap 9. The chinery adapted for the ?lling of paper bottles. flap 3 is also provided with "scoring H which is There are many smaller dairies who ?nd it, im practicable because of ?nancial considerations extended‘into a ?ap extension l8 where theends of the score lines are joined by a composite line to adopt paper bottles for their relatively small of severance formed by centrally disposed slitting distribution of bottled milk. indicated at [9 and scoring indicated at Ell-29. The present invention has forits object the pro vision of a paper milk bottle of exceptionally 20 The ends of the score lines I‘! in the flap 8 are joined by a‘crease formed hinge line 2L The car 22 surrounded by the lines l'l—.l'l, Ell-2e, Hand 2! will overlie the removable element iii simple form but which is nevertheless adequately leak-proof, of good appearance, and capable of being set up either by the dairy company or by of the?ap 9; a package forming concern without the addition of special costly package forming equipment. Other objects and advantages of the invention will be understood by reference to the following speci?cation and accompanying drawing (one sheet) wherein there is illustrated a paper milk bottle embodying a selected form of the inven tion. In the drawing, ‘ ~ Fig. 1 is a plan of the blank employed in form A The side margins of the ?ap 9 are adhesively ‘united to the inturned ?aps 6 and ‘I and the flap 8 is adhesively united to the underlying flap. 9 except that the ears £6 and 22 are saved against adhesive attachment of any area of the flap 9 30 outside of the removable elements l2 and I3. Theear i6 is adhesively attached to the element i2 and the ear 22 is adhesively attached to the 25 element I3. r In the production ‘of a carton embodying this ing' the paper bottle herein‘ shown; form, of end closure, the car it and removable 35 " Figs-2 and‘ 3 are perspectives of the bottom element l3 will initially be displaced as a unit end structure showing successive steps in. the about the hinge line IE to provide a ?lling open closing of said end of the container; ' ing indicated at 23 in‘ Fig. 4. The ear Z2 and ‘ Fig. 4 isra vertical section through‘the con the element l 3 will‘remain in their normal closed tainer on the plane represented- by the line 4—4 condition and the car 22 will not be displaced 40 of Fig. 3; from the ?ap 8 and its extension 18 until in the Fig.5‘ is, in part, a section on the line ‘5--5 hands of the consumer, who will be the ?rst one of Fig. 4, and in part, a side elevation in which to open the ear 22 and element I 3. This end there isillustrated a device which may be em construction may be considered the top end and ployedin ‘the operation of closing the bottle. Each of these figures,‘ 2 to 5 inclusive, repre sents the container in an inverted position, i. e., with the bottom‘ end up. 45 it is substantiallyin accordance with the struc ture shown in my co-pending application Ser. No. 632,251, ?led December 1, 1945. The ?apleX tension [8, as ‘best shown in Fig. 4, overlies the ' The improved paper bottle herein shown is adjacent end portion of the wall 3 and is ad formed from a, blank of the character illustrated 50 hesively attached thereto except that no portion in, Fig. 1. The blank is suitably creased to form of thel'ear '22 is adhered to the wall 3.‘ ‘ body, panels I, 2, 3 and 4‘ and a gluing ?ap 5 The bottom end of the container is closed by which, in. the process of forming the blank into means of a pair of flaps 24 and 25 which extend a carton, is overlapped on thefree marginal edge from the wall panels it and 3 respectively, and a portion oi the flap I and adhesively or otherwise st pair of flaps 21B ‘and. 21} which extend ‘from the 2,444,149; wall panels 2 and 4 respectively. The ?aps‘24 to 21 inclusive, like the ?aps 6 to 8 inclusive, are hingedly connected to the respective wall panels to each other and to the underlying ?aps 24 and 25 require some support for the ?aps 24 and 25 by means of creasing in the usual manner. The ?aps 24 and 25 are of such length that they each extend across substantially one-half the corresponding dimension of the end area of the most ?ap 26 to effect intimate adhesive bonding of these ?aps. so that pressure may be exerted on the outer The sealing strip 23 is not essential in the described construction or in the described container body and the flaps '26 and 21 are each method of closing the container end against the support provided by the air cushion in of substantially full size, that is to say, of such size that they each cover substantially the en 10 the container. However, by the provision of the sealing strip, leakage of compressed air from tire end area of the container body. The flaps 24 and 25 are ?rst folded inwardly, then either within the container is resisted to such an extent the flap 26 or the ?ap 21 followed by the remain that an adequate air cushion can more easily be ing one of these two. built up in the container to support, or in effect, To insure leak-proofness in the bottom of the to press the ?aps 24 and 25 outwardly against container around the corners formed by folding the over folded flaps 21 and 26. The ?aps 21 and 26 may be manually or mechanically held the flaps 24 to 21 inwardly as already explained, a suitable paper strip 28 is provided, said strip ex in the desired folded condition as, for example, tending continuously from the edge 29 of the by means of a shoe represented at 33, which may carton blank to the edge 30 thereof and being 20 be a normally stationary member under which arranged to overlap approximately equal portions of the blank on opposite sides of the fold lines which join the flaps 24 to 2‘! inclusive, to the respective wall panels. It is not essential ‘that the strip 28 extend equally to both sides of the fold lines joining the said flaps to the wall pan els and it may be so arranged as to extend far ther to one side of said fold lines than to the other. However, the arrangement shown is sat the formed containers are propelled in the proc ess of closing the bottom end of the container. The shoe may be hollow and provided with inlet and outlet openings to permit circulation of a tempering or cooling medium through theshoe ‘ for controlling or expediting the setting of the isfactory. The strip 28 is adhesively secured to the wall panels and ?aps so that when the said ?aps are folded to closure forming position the corre sponding portions of the strip 28 are also folded. The initial position is illustrated in Fig. 2 where in the ?aps 24 to 21 inclusive, are shown in an upwardly extending relation to the ends of the respective wall panels from which they extend and the corner sealing strip is shown approach ing the fold lines on which the respective ?aps are foldable. The ?rst step in closing the con tainer is to fold the flaps 24 and 25 inwardly adhesive between the flaps. The sealing strip 28 prevents leakage of compressed air outwardly between the adhesively united ?ap surfaces and thereby avoids any tendency to produce imper iectly bonded flaps. If desired, suitable means may be provided for sealing the opening 23 around the nozzle 32 to prevent air leakage at that point, but this is not necessary since an adequate supply of pressure 'air may include enough to compensate for such leakage. Also, it ' should be understood that it is preferable that only su?icient air pressure to adequately support the inner flaps be employed. , Various changes in the described arrange ment may be made without departing from the invention as described. as shown in Fig. 3. This is, of course, accom I claim: panied by corresponding folding of the under 1. The method of closing a container compris lying portions of the strip 28, corner portions 45 ing a tubular body having flaps at one end thereof being folded over as indicated at 3l-3l adapted to be folded into- mutually overlying re on the portions carried by the flaps 26 and 21. lation to close such container, which consists in The ?aps 26 and 21 are next folded inwardly, delivering compressed air into the container, fold the flap 2'! being shown ?rst folded over, the ing the ?aps successively inwardly into closure flaps 24 and 25 and the flap 26 over the flap 21, 50 forming position against the air cushion within although this order in respect of the flaps 26 the container, and effecting adhesive inter-at and 21 may be reversed. The provision of the tachment of the mutually engaging surfaces of strip 28 serves to provide a substantially con said ?aps. tinuous band in the bottom corner of the paper 2. The method of closing a container compris bottle with consequent reduction of the possi ing a tubular body having flaps at one end bilities of leakage developing in said corners. adapted to be folded into mutually overlying re By paraf?ning the bottle either by spraying lation‘ to close such container, which consists or by immersion in a bath of- molten para?in, in providing the container with a sealing strip preferably by the latter method, all voids be overlying portions of the container body and tween any parts of the bottom structure will be 60 closure flaps on opposite sides of the fold lines ?lled with para?in so that leakage is more ef about which the ?aps are foldable into closure 7 fectively prevented. forming position, delivering compressed airinto Containers such as here described are usually the container and maintaining such air delivery formed about a solid mandrel against which the to compensate for air escaping from the con end closure ?aps are pressed while effecting ad 65 tainer to thereby maintain an air cushion with hesive inter-attachment of the ?aps forming the end closure. However, with the described con struction it is practicable to close the end closure in the container, folding the?aps successively inwardly into closure forming position against the air cushion within the container, and effect flaps against compressed air delivered into the ing adhesive inter-attachment of the mutually container through the ?lling opening 23 by 70 engaging surfaces of said flaps, said sealing strip serving to prevent the escape of compressed air means of an air nozzle 32 which is connected to a suitable source of compressed air. The '?aps 24 and 25 may, of course, be initially folded in into the areas of adhesive inter-attachment to wardly without regard" to any support therefor but adhesive attachment of the flaps 26 and 2'! 75 gether in closure forming position. thereby insure e?ective bonding of said ?aps to _ . v3. The method of closing a container compris 2,444,143 5 ing a tubular ?oody having ?aps at one end adapted to be folded into mutually overlying relation to close such container, which consists in providing the container with a sealing strip overlying portions of the container body and clo sure ?aps on opposite sides of the fold lines about which the ?aps are folda'blle into closure form ing position, delivering compressed air into the 6 7. The method of closing a container embody ing a tubular body having one end closed and provided with a ?lling opening and its other end provided with adhesive bearing ?aps adapted to be folded into mutualy overlapping, adhesively interconnected relation in closure forming posi tion on‘ said other end of the body, which con sists in providing the container with a sea-ling strip on its inside and overlying portions of the container, folding the flaps successively inwardly into closure forming position against the air 10 closure flaps and tubular body on opposite sides of the fold lines on which said ?aps are foldable cushion within the container, and effecting ad into closure forming position, delivering com hesive inter-attachment of the mutually engag pressed air into the body of the container through ing surfaces of said flaps, said sealing strip serv said ?lling opening, then folding said ?aps into ing to prevent the escape of compressed air into the areas of adhesive inter-attachment to there 15 closure forming position and holding the outer most of said flaps in said position while the air by insure effective bonding of said flaps together pressure rwithin the container presses said ?aps in closure forming position. into intimate inter-engagement, said sealing 4. The method of closing a container embody strip serving to prevent the escape of compressed ing a tubular body having one end closed and provided with a ?lling opening and its other end 20 air into the zones of inter-engagement between said flaps, and coating the container inside and provided with adhesive bearing ?aps adapted to out with water proo?ng material. ‘be folded into mutually overlapping, adhesively 8. The method of closing a container compris interconnected relation in closure vforming posi ing a tubular body having one end closed and tion on said other end of the body, which con sists in delivering compressed air into the body 25 provided with a ?lling opening and its other end provided with adhesive-bearing flaps adapted to of the container through said ?lling opening, be folded into closure~forming position on said and then folding said flaps into closure forming other end of the ‘body, which consists in folding position and holding the outermost of said ?aps said ?aps into closure-forming position, holding in said position while the air pressure within the container presses said ?aps into intimate inter 30 the outermost of said flaps in said position, and delivering compressed air into the body of the engagement. container through said ?lling opening so as to 5. The method of closing a container embody cause said compressed air to press said ?aps into ing a tubular body having one end closed and intimate, adhesively secured interengagement. provided with a ?lling opening and its other end 9. The method of closing a container compris provided vwith adhesive bearing flaps adapted to 35 ing a tubular body having one end closed and be folded into mutually overlapping, adhesively provided with a ?lling opening and its other end interconnected relation in closure forming posi provided with adhesive-hearing flaps adapted tion on said other end of the body, which consists to toe folded into closure-forming position on said in providing the container with a sealing strip on its inside and overlying portions of the 010 40 other end of the body, which consists in provid ing the container with a sealing strip on its in sure flaps and tubular body on opposite sides side and in overlying relation to portions of the of the fold lines on which said flaps are foldable closure flaps and tubular body on opposite sides into closure forming position, delivering com of the Ifold lines on which said ?aps are fold pressed air into the ibody of the container through said ?lling opening, and then folding said flaps 45 able into closure-forming position, folding said flaps and the overlying portions of said sealing into closure forming position and holding the strip into closure-forming position, holding the outermost of said ?aps in said position while the outermost of said ?aps in said position, and de air pressure within the container presses said livering compressed air into the body of said con ?aps into intimate inter-engagement, said seal ing strip serving to prevent the escape of com 50 tainer through said ?lling opening so as to cause said compressed air to press said flaps into in pressed air into the zones of inter-engagement between said ?aps. timate, adhesively secure interengagement, said sealing strip serving to resist passage of com 6. The method of closing a container embody pressed air into the zones of interengagement be ing a tubular body having one end closed and provided with a ?lling opening and its other end 55 tween said ?aps. FRANK D. PALMER. provided with adhesive bearing flaps adapted to be folded into mutually overlapping, adhesively interconnected relation in closure forming posi tion on said other end'of the body, which con REFERENCES CITED The following references are of record in the sists in delivering compressed air into the loody 60 ?le of this patent: of the container through said ?lling opening, UNITED STATES PATENTS then folding said ?aps into closure forming posi Number Name . Date tion and holding the outer-most of said flaps in 1,634,073 Labombarde ______ __ June 28, 1927 said position while the air pressure within the Bergstein ________ __ Mar. 23, 1937 container presses said ?aps into intimate inter 65 2,074,357‘ 2,419,991 Dunning __________ __ May 6, 1947 engagement, and coating the container inside and out with water proo?ng material.