CA1156988A - Method of closing the top end of a carton - Google Patents
Method of closing the top end of a cartonInfo
- Publication number
- CA1156988A CA1156988A CA000316882A CA316882A CA1156988A CA 1156988 A CA1156988 A CA 1156988A CA 000316882 A CA000316882 A CA 000316882A CA 316882 A CA316882 A CA 316882A CA 1156988 A CA1156988 A CA 1156988A
- Authority
- CA
- Canada
- Prior art keywords
- side panels
- carton
- top end
- perimeter
- panel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 105
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 9
- 230000001939 inductive effect Effects 0.000 claims 6
- 239000011087 paperboard Substances 0.000 abstract description 8
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 235000013361 beverage Nutrition 0.000 description 7
- 238000007373 indentation Methods 0.000 description 7
- 239000004698 Polyethylene Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- -1 polyethylene Polymers 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- 239000011324 bead Substances 0.000 description 3
- 239000000123 paper Substances 0.000 description 3
- 208000003629 Rupture Diseases 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229920000136 polysorbate Polymers 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- WWYNJERNGUHSAO-XUDSTZEESA-N (+)-Norgestrel Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](CC)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 WWYNJERNGUHSAO-XUDSTZEESA-N 0.000 description 1
- YBYIRNPNPLQARY-UHFFFAOYSA-N 1H-indene Chemical compound C1=CC=C2CC=CC2=C1 YBYIRNPNPLQARY-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 101100456896 Drosophila melanogaster metl gene Proteins 0.000 description 1
- 101100286668 Mus musculus Irak1bp1 gene Proteins 0.000 description 1
- 101100000208 Mus musculus Orm2 gene Proteins 0.000 description 1
- 241000282337 Nasua nasua Species 0.000 description 1
- 241000282320 Panthera leo Species 0.000 description 1
- 206010038776 Retching Diseases 0.000 description 1
- 235000015076 Shorea robusta Nutrition 0.000 description 1
- 244000166071 Shorea robusta Species 0.000 description 1
- 101150094640 Siae gene Proteins 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000002844 continuous effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- UMFCIIBZHQXRCJ-NSCUHMNNSA-N trans-anol Chemical compound C\C=C\C1=CC=C(O)C=C1 UMFCIIBZHQXRCJ-NSCUHMNNSA-N 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
- B65D5/42—Details of containers or of foldable or erectable container blanks
- B65D5/4279—Joints, seams, leakproof joints or corners, special connections between panels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
- B65B51/10—Applying or generating heat or pressure or combinations thereof
- B65B51/22—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding
- B65B51/225—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding by ultrasonic welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
- B29C66/022—Mechanical pre-treatments, e.g. reshaping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/431—Joining the articles to themselves
- B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
- B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
- B29C66/4326—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms for making hollow articles or hollow-preforms, e.g. half-shells
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cartons (AREA)
- Making Paper Articles (AREA)
- Closing Of Containers (AREA)
Abstract
PAPERBOARD CARTON
Abstract of the Disclosure A one-piece blank forms a liquid-tight carton having plural rectangular side walls sealed or integral with one another at adjoining side edges and flat end panels of polygonal shape, the carton facilitating ultrasonic sealing of the end walls to the side walls through a unique set of sealing tabs on the side and end walls. The process and equipment for sealing the end walls to the side walls permits ultrasonic heating and sealing after the carton is full of liquid through a compression of the sealing tabs of these walls between facing dies which are diagonally aligned in relationship to the side and end walls. The carton formed by this blank facilitates nesting of multiple cartons, one above the other.
Abstract of the Disclosure A one-piece blank forms a liquid-tight carton having plural rectangular side walls sealed or integral with one another at adjoining side edges and flat end panels of polygonal shape, the carton facilitating ultrasonic sealing of the end walls to the side walls through a unique set of sealing tabs on the side and end walls. The process and equipment for sealing the end walls to the side walls permits ultrasonic heating and sealing after the carton is full of liquid through a compression of the sealing tabs of these walls between facing dies which are diagonally aligned in relationship to the side and end walls. The carton formed by this blank facilitates nesting of multiple cartons, one above the other.
Description
Back~round of the Invention The prior art includes one-piece, T-shaped blanks for forming cartons to hold liquids, such as beverages. One such prior art patent issued to Mitchell J. Matovich, Jr., on April 18, 1978 and bears U.S. Patent No. 4,084,489. The T-shape in such pxior blanks results from the provision of end closure panels at the opposite ends of one of the side wall panels of the carton. Each of the remaining side wall panels is provided at its ends with sealing tabs to be bent inwardly after the blank has been folded into the configuration of an open ended tube, and si.de seamed by means of a side seam flap carried by the same side wall panel with which the two end closure panels are associated. The free edges of the end ., D
~ ,~ . .
~ ~ ~ :
`` ~ .
~ closure pane1s are designed to be sealed to the sealing tabs
~ ,~ . .
~ ~ ~ :
`` ~ .
~ closure pane1s are designed to be sealed to the sealing tabs
2 on the ends o the side wall panels and, in the cited prior
3 application as well as mos-t prior art used to form flat-ended
4 cartons, the edges of the end closure panels, or at least the ~ last of the end closure panels to be closed, and the sealing 6 flaps on the side wall panels adjacent that end, are Eirst 7 heated to render the polyethylene or other material sealing 8 the carton in a semi-molten condition. ~fter such hea-ting, 9 the end closure panel is pressæd onto the top of the previously formed carton side walls to clo~e and seal the carton over its ~ contianed liquid.
12 The prior art also recognizes the fact that ~here are 13 substantial advan-tages to utilizing ultrasonic energy as a 14 means o heating and sealing cartons. Unortunatelyr ultrasonic heating requires that the pair of carton edges being sealed t~
1~ one another be placed under pressure between an ultrasonic 17 horn and an anvil, these two me~ers pressing toward one 18 ano~her during the application of ultrasonic energy~
19 Ultrasonic sealing involves the vibration of an ultrasonic horn relative to a stationary anvil which 21 must be heavy enough to remain stationary inspite o the 22 vibration o the ultrasonic horn against it. The marginal 23 edges of the paper carton which are placed between the 24 ultrasonic horn and the anvil are heated in the regions where they are hammered between the horn and the anvil. The heating 26 of these edges is dependent upon the pressure applied by the 27 rapid hammering of the ultrasonic horn against the paperboard 28 carton lying on the anvil~ If the anvil is too light in 29 weight, the anvil will vibra~e with the ultrasonic horn~
and very little relative motion will occur between the ~2 ultrasonic horn and the anvil. Therefore, very lit-tle heat will be induced in the paperboard carton. Yurthermore, the 3 anvil must provide a continuous area of support for the marginal edges beneath the ul-trasonic horn in order for a continuous seal to be effec-ted. In areas where the support 6 provided by the anvil to the marginal edges is discontinuous, 7 no heating will occur in the marginal edges, and therefore no 8 seal will result in those areas. A ~urther requirement for 9 efecting a continuous seal is that the paperboard carton ~0 itsel~ be continuouq in the regions where a seal i~ to b~
lI effected. Thus, gaps or tears in the marginal edges will 12 interrupt the formation of heat during the pounding of these 13 edges between the ultrasonic horn and the anvil~
14 When sealing the side walls of a previously ~everage~
filled carton to the top end closure pane], it is imposslble 16 to place a sealing an~il inside of the containerO Thus, no 1~ adequate means has been discovered to permit sealing such a 18 carton utilizing ultrasonic energy.
19 It is believed to be known to form the upper carton end (after beverage filling) into a gable roof which permits a 21 single gable roof seam to be sealed ultrasonically while 22 being pinched between an ultrasonic horn and anvil, each f 23 which lies in a plane which is perpendicular to a plane 24 defining the flat upper end of the carton. While such gable roofed cartons operate satisfactorily, they do not facilitate ~6 stacking on top of one another in a larger carton, as is 27 desirable when the beverage cartons are relatively small 28 ~as with one-half and one-third quart milk cartons)~ In 29 addition r the formation oE the gable top on these cartons requires a substantial increase in the amount of carton 31 material required for the beverage container since typically ~ i LS~ ~ ~ 8 1 the en-tire yable top is void o beverage and is simpl~ extra 2 paper stock material folded to provide -the gable roof.
3 I S~unmary of the Inve~tion I
4 ¦ The carton blank which is the subject oE the present
12 The prior art also recognizes the fact that ~here are 13 substantial advan-tages to utilizing ultrasonic energy as a 14 means o heating and sealing cartons. Unortunatelyr ultrasonic heating requires that the pair of carton edges being sealed t~
1~ one another be placed under pressure between an ultrasonic 17 horn and an anvil, these two me~ers pressing toward one 18 ano~her during the application of ultrasonic energy~
19 Ultrasonic sealing involves the vibration of an ultrasonic horn relative to a stationary anvil which 21 must be heavy enough to remain stationary inspite o the 22 vibration o the ultrasonic horn against it. The marginal 23 edges of the paper carton which are placed between the 24 ultrasonic horn and the anvil are heated in the regions where they are hammered between the horn and the anvil. The heating 26 of these edges is dependent upon the pressure applied by the 27 rapid hammering of the ultrasonic horn against the paperboard 28 carton lying on the anvil~ If the anvil is too light in 29 weight, the anvil will vibra~e with the ultrasonic horn~
and very little relative motion will occur between the ~2 ultrasonic horn and the anvil. Therefore, very lit-tle heat will be induced in the paperboard carton. Yurthermore, the 3 anvil must provide a continuous area of support for the marginal edges beneath the ul-trasonic horn in order for a continuous seal to be effec-ted. In areas where the support 6 provided by the anvil to the marginal edges is discontinuous, 7 no heating will occur in the marginal edges, and therefore no 8 seal will result in those areas. A ~urther requirement for 9 efecting a continuous seal is that the paperboard carton ~0 itsel~ be continuouq in the regions where a seal i~ to b~
lI effected. Thus, gaps or tears in the marginal edges will 12 interrupt the formation of heat during the pounding of these 13 edges between the ultrasonic horn and the anvil~
14 When sealing the side walls of a previously ~everage~
filled carton to the top end closure pane], it is imposslble 16 to place a sealing an~il inside of the containerO Thus, no 1~ adequate means has been discovered to permit sealing such a 18 carton utilizing ultrasonic energy.
19 It is believed to be known to form the upper carton end (after beverage filling) into a gable roof which permits a 21 single gable roof seam to be sealed ultrasonically while 22 being pinched between an ultrasonic horn and anvil, each f 23 which lies in a plane which is perpendicular to a plane 24 defining the flat upper end of the carton. While such gable roofed cartons operate satisfactorily, they do not facilitate ~6 stacking on top of one another in a larger carton, as is 27 desirable when the beverage cartons are relatively small 28 ~as with one-half and one-third quart milk cartons)~ In 29 addition r the formation oE the gable top on these cartons requires a substantial increase in the amount of carton 31 material required for the beverage container since typically ~ i LS~ ~ ~ 8 1 the en-tire yable top is void o beverage and is simpl~ extra 2 paper stock material folded to provide -the gable roof.
3 I S~unmary of the Inve~tion I
4 ¦ The carton blank which is the subject oE the present
5 ¦ invention, as well as the method utilized for forming the
6 ¦ blank into the carton, IS speciEically adapted to ,~ ¦ facilitate ultrasonic sealing of marginal edge~ of the carton 8 ¦ upper end closure panel to the upper edges o the car~on side 9 ¦ walls after the carton has been~filled with a beverage.
10 ¦ The paperboard carton has ~he novel feature of a lI ¦ continl1ously unbroken sealing edge or tab extendiny around 12 ¦ the perimeter of the carton, which is unbroken even in the 13 ¦ vicinity of the corners between adjacent side panels~ This 14 ¦ invention also provides for an anvil which is sufficiently 15 ¦ heavy to provide the rec~uired static support to the paperboard 16 ¦ carton during ultrasonic heating while at the same time providing ~7 a small lip which supports the sealing tab of the carton 18 continuously around the adjacent side panels of the carton 19 while the carton may be filled with liquidr The sealing lip is prevented from yielding to the ultrasonic vibrations of ~1 the ultrasonic horn by reason of its small extension ~rom 22 the body of the anvil. The extension of the lip on the anvil 23 is therefore made ak an approximately 45-degree angle, since 24 this structural shape minimizes the inducement of vibrations in the lip by the ultrasonic horn. For this reason, the lip 26 of the anvil merely indents the sealing tab a short clistance 27 below the top of -the side panel. In order to prevent tearing 28 or breaking of the sealing tab of the carton in the region o-E
29 the corners between adjacent side panels of the carton, the lip of the anvil is formed with a gradual radius in the corresponding 31 corners Eormed in the anvil. The sealing -~ab is ~olded ~o form 52 ~ ;
-4~
~ :
1 a double thickness wall portion, which also serves to~prevent 2 tearlng in the vicini-ty of ~he corners. The small size of the 3 ¦ indentation oE the -tab effected by the sealing lip of the anvil 4 ¦ also serves to minimize the strain in the ~icinity of the cornars 5 ¦ of the sealiny tab and thereb~ prevent tearing.
6 ¦ Thus, the invention provides an ultrasonically sealed,
10 ¦ The paperboard carton has ~he novel feature of a lI ¦ continl1ously unbroken sealing edge or tab extendiny around 12 ¦ the perimeter of the carton, which is unbroken even in the 13 ¦ vicinity of the corners between adjacent side panels~ This 14 ¦ invention also provides for an anvil which is sufficiently 15 ¦ heavy to provide the rec~uired static support to the paperboard 16 ¦ carton during ultrasonic heating while at the same time providing ~7 a small lip which supports the sealing tab of the carton 18 continuously around the adjacent side panels of the carton 19 while the carton may be filled with liquidr The sealing lip is prevented from yielding to the ultrasonic vibrations of ~1 the ultrasonic horn by reason of its small extension ~rom 22 the body of the anvil. The extension of the lip on the anvil 23 is therefore made ak an approximately 45-degree angle, since 24 this structural shape minimizes the inducement of vibrations in the lip by the ultrasonic horn. For this reason, the lip 26 of the anvil merely indents the sealing tab a short clistance 27 below the top of -the side panel. In order to prevent tearing 28 or breaking of the sealing tab of the carton in the region o-E
29 the corners between adjacent side panels of the carton, the lip of the anvil is formed with a gradual radius in the corresponding 31 corners Eormed in the anvil. The sealing -~ab is ~olded ~o form 52 ~ ;
-4~
~ :
1 a double thickness wall portion, which also serves to~prevent 2 tearlng in the vicini-ty of ~he corners. The small size of the 3 ¦ indentation oE the -tab effected by the sealing lip of the anvil 4 ¦ also serves to minimize the strain in the ~icinity of the cornars 5 ¦ of the sealiny tab and thereb~ prevent tearing.
6 ¦ Thus, the invention provides an ultrasonically sealed,
7 ¦ flat top beverage con-tainer which facili-tates nesting of one
8 ¦ container above another during shipment. This is accomplished ~ ¦ by forming the sealing tabs a~ the en~s of adjacent side wall 10 ¦ panels integral with one another, rather than separ~ted fr~m lI ¦ one another by a V-shaped cut as was common in the prior art.
12 ¦ In eEfec-t, the sealing tabs of this invention are connected by 1~ ¦ corner webs. These sealing tabs thus run continuously around 14 ¦ three sides of the carton once it has been formed into an open 15 ¦ ended tube. The tabs are bent inwardly to form, in efect, a 16 ¦ double thickness wall portion at the upper perimeter of the 17 ¦ side wall panels.
18 i ~
21 ~
23!
31 ~
52 ~ _5_ ~ s~
~ j ~f-ter fillin~ the carton ~ith liquid, the doubl~ .thickness~
2 ¦ upper wall portion Eormed by the sealing -tabs and the side wall 3 I panels, together witk the perime~er edge o~ the kop end closure ¦ panel, are press forme~ between aajacen-t die faces, the faces 5 ¦ lyin~ in a plane inclin~d at an angle of approxima~el~ 45 degrees 5 ¦ with respect to the plane of both the upper end closure panel 7 ¦ anc~ the sic~e wall panel being sealed. This pressi~g opera~io~
¦s-tretches the webs whic~ interconnec-t the sealing tabs~ In oraer ¦ to assure that this s~re~ching ~oes no~ rup~ure -the ~ebs ~0 ¦interconnecting the.sealing tabs at the carto~ corr:ers, the 11 ¦carton is indented by the sealing die at a loca-tiorl imm~dia~ely 12 ¦below the seal, so that the outermos~ position xeache~ b~ the 13 ¦sealing tabs and -their interconnecting webs is insu~ficien~ ~o 1~ ¦cause tearing~ The double thickness a-t the sealed corner also 15 ¦assists in prohibiting rup-ture at this location.
16 ¦ After the die has been used -to form ~he adjacent sealing 17 ¦eclges in the manner described abover an ultrasonic horn is 18 ¦placed against -the perimeter edges, the contacting end o~ -the 19 ¦horn also defining a ~5 degree angle plane relative the side 20 ¦~7all and end closure panel of the car~on. Applica~ion of ~1 ¦untrasonic energy -to -the perimeter margin then seals the 22 ¦upper end closure ~o the side ~lall panels 23 ¦ After fillincJ and sealing, as previously described, the 24 ¦ carton forms a flat -~opped, pol~yonal skruc~ure which is adaptea 251 ~o nesting, one above the other, during shipm~nt.
26 ¦ These ana other advantages of khe present invention are 27 ¦best underskood throu~h the following detailec~ descripkion 28 ¦ of ~he preferred embodimenk which references the dra~ings, in 29 ¦ which: -~0 32 I -6~
l ,.
~ l I
~¦ Fi~lre :l :is a ~lan vi.ctl o~ tll~ carton bl~nk us~cl to ~orm 2 ¦ ~i-e cartc)ll o~ the ~resellt invcntioll;
¦ r`i~Jure 2 is a pers~pectivc view sho;?incf the carton OL th~
~¦ present invention partially ~orm2d fro~ -the blank of ~igure 1, 5 ¦ but prior to closure of tlle uppe~ ~nd closure panel onto the 6¦ side walls;
,~¦ Figure 3 is a sch~matic~ perspective view showing the ~¦ partially formed carton nf Fi~ure ~ located ~ithin a schematicall~
~¦ illustrated anvil and showing, in addition, the aie usea 10¦ compress the carton perimeter ~dges agains~ the anvil, 11 ¦ Figure 4 is a persp2ctive view o~ the carton formed by 12¦ the apparatus an~ process ol Figure 3 after pexim~ter ed~e 13¦ sealinc~;
1~ ~ ure 5 is an enlarged sectional view ta~en along lines 1~ ¦ 5-5 of ~igure ~ and sho;~ing the conEicJuration of the carton 16 end closure and side walls at the intexsection of two such 17 ¦ side walls;
18 ~ Eigure 6 is an enlarged sec,tional view tal;en alol~g lines 19 ¦ 6-6 o~ Figure 3 sho~ing the interr~lationship of the par~iall~
20 ¦ ~orm~d carton of Figure 2, the anvil and ~he die as the upper 21 ¦ carton end is sealed;
22 ¦ ~igure 7 is a sectional view similar to that o~ Fi~ure 23 ¦ sho~Jiny the di e fully in place on the an~il; and 24 ¦ Fic~ure 8 is a sec-tional view similar to that of Figures 6 2~ and 7 showincJ -the ultrasonic horn replacin~ the die above the 26 ¦ anvil ~or the ~inal sealin~ step o~ the metl~od used ~or ~oxming ?~7 ¦-the carton oE tlle pr~sent i.nvention 28 ¦ Detailed ~escript:ion o~ -tho Proforred r.n~ocl.~m~nt 2g ¦ Referriny initially to ~ic~ure lt the re~erence n~ er~l 30 1ll desicJnates ~ pol~ethylelle coated paperboara blan~; o.F T-sh~p~cl ~1 . ' ' .
-7~
~ p~
~ collCi~J~L-~lt~ C~ .ic~ cc,~ ccl~on, ~alc~ to hc lj.c~
2 tigllt, ma~ clcrived w~ o~lt Lcc~ cJ ~ othc.r car~on 3 compoll~nts. Tlle l?lanl; is cornpri.sed of four cclr~on side wall panels 13, 15 r 17, and 1~, separ~ted or delineated by indenta~ion lines or scorings 21 along ~.rnich foldin~ o kh~ blan~ in~o car~on ~ ¦ confi~ura~ion may -take plac~.
7 The wall panel 13 has inte~ral there~Jith ana delineate~
by indel~tation line or scoring 23, a lo~er carton end closure
12 ¦ In eEfec-t, the sealing tabs of this invention are connected by 1~ ¦ corner webs. These sealing tabs thus run continuously around 14 ¦ three sides of the carton once it has been formed into an open 15 ¦ ended tube. The tabs are bent inwardly to form, in efect, a 16 ¦ double thickness wall portion at the upper perimeter of the 17 ¦ side wall panels.
18 i ~
21 ~
23!
31 ~
52 ~ _5_ ~ s~
~ j ~f-ter fillin~ the carton ~ith liquid, the doubl~ .thickness~
2 ¦ upper wall portion Eormed by the sealing -tabs and the side wall 3 I panels, together witk the perime~er edge o~ the kop end closure ¦ panel, are press forme~ between aajacen-t die faces, the faces 5 ¦ lyin~ in a plane inclin~d at an angle of approxima~el~ 45 degrees 5 ¦ with respect to the plane of both the upper end closure panel 7 ¦ anc~ the sic~e wall panel being sealed. This pressi~g opera~io~
¦s-tretches the webs whic~ interconnec-t the sealing tabs~ In oraer ¦ to assure that this s~re~ching ~oes no~ rup~ure -the ~ebs ~0 ¦interconnecting the.sealing tabs at the carto~ corr:ers, the 11 ¦carton is indented by the sealing die at a loca-tiorl imm~dia~ely 12 ¦below the seal, so that the outermos~ position xeache~ b~ the 13 ¦sealing tabs and -their interconnecting webs is insu~ficien~ ~o 1~ ¦cause tearing~ The double thickness a-t the sealed corner also 15 ¦assists in prohibiting rup-ture at this location.
16 ¦ After the die has been used -to form ~he adjacent sealing 17 ¦eclges in the manner described abover an ultrasonic horn is 18 ¦placed against -the perimeter edges, the contacting end o~ -the 19 ¦horn also defining a ~5 degree angle plane relative the side 20 ¦~7all and end closure panel of the car~on. Applica~ion of ~1 ¦untrasonic energy -to -the perimeter margin then seals the 22 ¦upper end closure ~o the side ~lall panels 23 ¦ After fillincJ and sealing, as previously described, the 24 ¦ carton forms a flat -~opped, pol~yonal skruc~ure which is adaptea 251 ~o nesting, one above the other, during shipm~nt.
26 ¦ These ana other advantages of khe present invention are 27 ¦best underskood throu~h the following detailec~ descripkion 28 ¦ of ~he preferred embodimenk which references the dra~ings, in 29 ¦ which: -~0 32 I -6~
l ,.
~ l I
~¦ Fi~lre :l :is a ~lan vi.ctl o~ tll~ carton bl~nk us~cl to ~orm 2 ¦ ~i-e cartc)ll o~ the ~resellt invcntioll;
¦ r`i~Jure 2 is a pers~pectivc view sho;?incf the carton OL th~
~¦ present invention partially ~orm2d fro~ -the blank of ~igure 1, 5 ¦ but prior to closure of tlle uppe~ ~nd closure panel onto the 6¦ side walls;
,~¦ Figure 3 is a sch~matic~ perspective view showing the ~¦ partially formed carton nf Fi~ure ~ located ~ithin a schematicall~
~¦ illustrated anvil and showing, in addition, the aie usea 10¦ compress the carton perimeter ~dges agains~ the anvil, 11 ¦ Figure 4 is a persp2ctive view o~ the carton formed by 12¦ the apparatus an~ process ol Figure 3 after pexim~ter ed~e 13¦ sealinc~;
1~ ~ ure 5 is an enlarged sectional view ta~en along lines 1~ ¦ 5-5 of ~igure ~ and sho;~ing the conEicJuration of the carton 16 end closure and side walls at the intexsection of two such 17 ¦ side walls;
18 ~ Eigure 6 is an enlarged sec,tional view tal;en alol~g lines 19 ¦ 6-6 o~ Figure 3 sho~ing the interr~lationship of the par~iall~
20 ¦ ~orm~d carton of Figure 2, the anvil and ~he die as the upper 21 ¦ carton end is sealed;
22 ¦ ~igure 7 is a sectional view similar to that o~ Fi~ure 23 ¦ sho~Jiny the di e fully in place on the an~il; and 24 ¦ Fic~ure 8 is a sec-tional view similar to that of Figures 6 2~ and 7 showincJ -the ultrasonic horn replacin~ the die above the 26 ¦ anvil ~or the ~inal sealin~ step o~ the metl~od used ~or ~oxming ?~7 ¦-the carton oE tlle pr~sent i.nvention 28 ¦ Detailed ~escript:ion o~ -tho Proforred r.n~ocl.~m~nt 2g ¦ Referriny initially to ~ic~ure lt the re~erence n~ er~l 30 1ll desicJnates ~ pol~ethylelle coated paperboara blan~; o.F T-sh~p~cl ~1 . ' ' .
-7~
~ p~
~ collCi~J~L-~lt~ C~ .ic~ cc,~ ccl~on, ~alc~ to hc lj.c~
2 tigllt, ma~ clcrived w~ o~lt Lcc~ cJ ~ othc.r car~on 3 compoll~nts. Tlle l?lanl; is cornpri.sed of four cclr~on side wall panels 13, 15 r 17, and 1~, separ~ted or delineated by indenta~ion lines or scorings 21 along ~.rnich foldin~ o kh~ blan~ in~o car~on ~ ¦ confi~ura~ion may -take plac~.
7 The wall panel 13 has inte~ral there~Jith ana delineate~
by indel~tation line or scoring 23, a lo~er carton end closure
9 panel 25 which~ iIl this par~icular inst~nce, is square hecause 0 the four side wall panels 13 thr.ou~h lg are shown as beln~ o~
11 equal wid-th If ~wo side wall panels are to be o:E aiffe~nt 12 widths tl~an -the othex two, in alternation ~mong t~e four, 13 the xesultin~ carton would be a xectan~ular cross sec~ion 1~ and not square and the end panel 25 would accordingly be 15 r~ctan~ular and not square. Xf tllere were only three side 16 ~7all panels instead of fc,ur, the end panel 25 ~70uld, of 17 course, be triancJular.
18 ~ ~t the remainin~ end of the side ~7all r~anel 13, a top lg end closure panol 27 extenæs (without an inaentation or 20 scoring for delineation) from the s.id2 wall 13. ~he upp~r ~1 end wall 27 is wider than the lower end closure ~5 or side 22 wall 13 ancl, in addi'cion, extends further from the side 23 wall 13 than does the bottom end closure 25. The l~ncJth and 2a width of the end wall 27 is thus yreater than the width of ~n~ of the panels 13--19. This increasecl size is requircd for 26 oYerlapp:Lng scalincJ with the sicl~ wall pan~ls 15-19 as ~7ill be 27 unclerstood as -this description continues.
28 The side wall panels 15, 1~ and 19 eacll ha~e, at -their ~,~J lower ends, sealincJ flays or tabs ~ clc:l..in-al:ea ~y il~dent:ation ~0 or scor inCJ line.~; 3:1 ancl se~>al-atecl Erom one ~nc~thcr by ~ pair .
32 . .
~8~
p~L5~
..
1 of indentation or scoring li~es 33,35 The upper end of each 2 oE the panel~ l5r 17, ~nd 19 is also prov;ded with sealing 3 1aps or tabs 37, 39, and ~1, respectively~ delineated by indentation or scoring lines ~3, ~5, and ~7, respectivel~
~ The prior ar-t would suygest a separation of the tabs 6 37 ~ 39 ~1 r one from ~no~her~ ~n -th;s case r however, ~hey axe ~ connected b~ webs 53 and ~5 OL material. Xt has been found ~hat 8 these score lines 57 and 59 defining the webs prefera~ly ex~en~
9 all the way to the score lines 43 - 47r but could stop som~wha~ -shor~ of those score lines so ~hat the apexes of ~he trian~ular 11 webs 53 and 55 arè spaced slightly from the score lines ~ - 47.
12 Along its free edge, the side wall panel 19 is provîded 13 with ~ sealing tab 49 delineated b~ the indenta-~io~ or.: -14 scoriny line 51.
~inally, in the case o~ a car-~on par~icularl~ adapte~
16 to hold potable li~uids and provid2d internall~ wit~ a sipperr 17 as taug~t ~y Kalajian Patent No. 3,259~297, granted ~ul~ 5, 18 196G, one o~ the side wall panels, for example the side ~Jall lg panel 13~ may be prov.ided with a rectan~ular opening 1~3 ~0 adjacen~ to one end of the panel and extending parallel ~o 21 the long dimension of the side wall 13. The opening is 22 produced by cutting through the side wall panel -~o produce 23 either a flap connected at one end or a complete opening, 2a either of which w~ll support a sipper which is mounted in ~ manner ~lhich permits its rotation ~bou-t one end of -the 26 openingls3 so that it may be extendea from the carton ~uring 27 use.
28 ~ereas with prior designs the ends of the sealing fl~ps 29 37 through ~1 were often cu-t as~ay at an angle, the seal~ng ~iO
_g_ ' '.
1 ¦ flaps 37-~1 of the blank llr as inclic~ed above, remaln connected 2 ¦ to one another b~ V-shaped web sections 53 ~nd 55~ Each of the 3 ¦ scoring lines 57,5.9 i.s at an ancJle of approximately 45 de~rees 4 ¦ with respect to the àdjacen-~ scoring li.nes 21t ~3~ 45~ an~ 47~
~ ¦ Scor;ng lines 57 and 59 typically intersect the scoring lines 21 6 at the scoring lines 43,45,47 to facilitate a righ~ angle-bend between the siae panels 15,1~rl9~
. . The carton is shown in a partially formed condi~io~ in 9 Figure 3 ~ a number o-f steps ha~ing heen accomplished to ~0 bring the car~on -to this stage ~f com~letion. The firs~
1~ step is to bend or flex the several wall panels a~ ~heir 12 scoring lines 21 to bring them around in~o ~he ~orm of an 13 open-ended tube, with the sealing tab 4g on the side wall 1~ panel 1~ inside and overlapping the edge o~ the side wall 1~ panel 13, It is contemplated that the blan~ 11 will be 16 formed of a paper stock coated with polyethylene -to render 17 -i~ impervious to li~uids and the formation o~ the blan~
18 into an open ended tube is accomplished by placing a mandrel 19 insiae of the open ended tube and agains-t the sealing tab 4~, with ultrasonic energy bein~ applied to the exterior sur~ace .
21 of the panel 13 where it overlaps the tab 49, The ultrasonic ~2 energy par-tially melts the polyethylene on ~he t~o surEaces 23 while the surfaces are held in contact with one another under 2~ pressure kill the polyethylene uses to effect a seal bet~Jeen these two sur~aces 2~ After the formation of this open ended tube, the bottom 27 panel 25 can be sealed to the tabs 29 to close the bo~tom of ~he 28 tube. This is generally accom~lished by ~irst folding the 29 tabs 29 toward the interior of the open-encled tube f~r~ea by ~0 ~10- . ,, ' :~
1 the side walls 13 throuyh 19, the score lines 33, 35 forming 2 overlappi.ng corner sections during this Eolding. The end 25 3 is then folded against the bot-tom oE the open-ended tube and, in particular, into àn overlapping relationship with the tabs 29. ~ mandrel is then placed on the inside or outsiaa of the tube and against the overlapping poxtion of the 7 end closure 25 and end tabs 29 and, on the opposite side, 8 an ul-trasonic hoxn is placed against the same overlapping members~
9 Ultrasonic energy is then applied to seal khe polyekhylen~ on the confronting sections. It will b~e sean from the previous 11 description that, in the case of the formation of the tuba as well 12 as ~he closure of the bot~om, it is possible, because there is no 13 liquid within the -tube, and because a portion o~ the ~ube ~emains 1~ open for access, to place a mandrel or anvil within the tube so that a confronting rela-tionship between such a mandrel and an 16 ultrasonic horn can be accomplished, with the parts to be 17 seale~ pinched between these confrontiny me~ers. It is, of 18 course, the object of the presen-t invention to allow ultrasonic 19 sealing of the open upper end of the tube sho-~ in ~i~ure 2 2.0 at a time when liquid fills the carton, 50 that a mandrel or 21 ultraso~ic horn canno-t be placed inside oE the carton 22 This sealing method for the upper closure end 27 is shown in 23 Figure 3. In order to aia in closing the carton, preferably 2~- the upper lid 27 may be folded to a closed position and released, prior to the condition of the carton shown in Figures 2 and 3 r 26 in ~7hat can be considered to be a limbering operation~
~7 Polyethylene coated paperboara tends to have a me~ory so that, 28 ¦when relieved of the flexing pressure, -the closure end 2 29 ¦tends to self~restore a part of the distance toward its 30 I .
~1 32 ~
~
~ ~L la~ 3 1 ori.c~inal position lying i n a plane par~lle:l. to the pl~ne oE
2 the side 13. The posi-tion of ~he closurc end 27 in F~gures 2 3 and 3 is a reasonable representa-tion of ~he a-l:ti tude of this closure end ~7 af ter :~he limbering op~r~tion ana prior to ~being pressed down and sealed. In addition, ~he lid has been pxeEorme~
6 to hawe its marginal portions at all three non-hinged e~ges extend up a~ abou-~ a ~5 degree an~le~ A limbering opera~ion may 8 also be completed on the sealing tabs 37 thrsugh 41, an~ ~h~se tabs ma~ be folded in~araly toward ~he cen~er of -~he open-ended tuba and beyona this point r SO as to lie 1at agains~ ~he u~per 11 por-tion o~ the waIl panels 15 through 19~ ~en xeleased from 12 this position, ~he sealiny tabs 37 through 41 will re~urn 13 par~ially toward the upper end o the car~on, as shown, but will 14 not return ~o a location which would make them coplanar. Ra~herr they remain folded belo~-the level of the upper margin o~ ~he 16 side panels 15-19.
1~ Referring again briefly to Figure 1, it should be noted 18 that, in oraer to fold the upp~r end closure panel 27 and ~he 19 sealing tab 37 extending rom the side panel 15 in separa~e ~0 directions, it is necessary to cut these members apart from Zl one another, as shown by the cut line 60 As will be full~
22 underskood through the description which follows, the cu~
23 line 60.extenas onl~ part-way from the ree edge of the sealing 24 tab 37 to~ard the score line 43, bu~ does not intersec-t ~he score line 73, so that a small lin~ or web of con~inuous, uncu~
~6 material remains between the tab 37 and the end closure 27 panel 27~
28 Referrin~ now to Fi~ure 3, the carton, filled with liquid 29 in its partially cor.lpleted condition as sh~wn in ~i~ure ~ r . . ~ , ,.
~ 3~
~ !i.s placecl in ~l three-siclecl anv.il 61 constructed to conform with 21 the outside' surfaces oE the co~'~ainer and to abut-~he side panels 31 15, 17, and 19. ~ccordingly/ the ~nvil 61 is sho~1n to include ~¦ ~ bac~ ~rame 63 i.nterconnectiny a lower U-shaped section 6 51 and an upper IJ-shaped section 6-/~ As previously stated~ at 61 the time -that the carton is placed into ~he anvil 61, i~ has 7 ¦been previously filled w.ith fluid and the upper ena closure '8 ¦2~ has been partially closed.,' An upper die 69, havin~
¦lower edges con~ormin~,with the u~per edges o the anvil 61~ , ~0 ¦is lowered, as shown by -the arrow 71r onto ~he an~il'61'to '.
11 ¦compress the upper closure end 27 a~ainst ~he sides 13-19 12 ¦of the container, This closuxe operation is best unders~ood 13 ¦by re~erence to ~.igure 6.
1~ ¦ ~s shown in Figure 6, the side wall 17 (~nd each of the 1~¦ other side walls in a similar mannex) is placed in abut~in~
16¦ relationship with -the upper U-shaped section G7 o~ the 17 ¦anvil 61~ The bend formea at the score line 45 between 18¦ the side panel 17 and sealing tab 37 is posi~ioned c~ove 1~¦ a diagonall~ beveled upper edge 73 of the anvil.61~ The uppe~
20¦ ~ie 69 includes a beveled edge J5 con~or~ling with t~le beveled'' 21¦ edge 73r and this edge 75, ~7hen the die 69 is lot~ered and pressed 22¦ onto ~he anvil 67, foxces bo~h the perime~er ed5e o~ ~he upp2r 231 closure end 27, the sealing tab 39 and upper perim~-tex pO~tion 2~1 f -the side panel 17 into abutting relationship, This 251 relationship is sho~m in Figure 7~ t'ne die 69 full~ lowered 26¦ on~o and pressing against the anvil 67 and sc~ueezing the three 27 layers of material 39~27~17 which form the sealing interface 28 at the upper perimetex of the carton.
2~ ~fter the die 69 has been loweled into a scfueezing relationshi ~0 as shown in ~igure 7, it is removecl, anc~ an ultrason;c hoxn 77r 31 having a beveled eage 79 identical to the beveled edge 75~ is -13- .
: '' '` :.`
~ ` ~
~ 3~
1 lo~ered into plac~ on the anvil 67. Ult.rasonic ener~y is 2 applied by the ~lorn 77 to the three layers of ma-teria:l 3~,27,.17 3 to heat the three ]ayers and seal the ~olyethylene coati~
thereon to for}n a sec~led corner edge.
The three layers oE material sealed at the edge lie 6 substantiall~ in a plane designated in Figure 8 b~ numaral 7 81. This plane is inclined at an angle of approxi~.atel~
8 45 degrees wi-th respect ~o both the upper end clvsure 27 9 ana the side wall 17.
It should be noted that, ~hile Figure 3 s~ows the die 11 69 moving stxaight do~n onto the anvil 67 ~as shown by ~he 12 arrow 71), the fact ~hat the die 69 onl~ abuts the anvil 13 61 on three sides may require that the force applie~ to the 14 die also have a hori~ontal component from ric~h-t to let in ~5 Figure 7 as there is no pressure applied by the die at the ~6 hinged eage~ In practice it is found that the xesulting orce 17 on the die in ~i~ure 7 should be diagonally down and left~ It 18 may be preferable ~or the die 69 to reciprocate in a diagonal 19 direction down and to the left in Figure 7 a-t an appropriate 2.0 angle, to equalize the fo~ces between these members. It 21 should also be recognized that the remaining two sealing tabs 22 37 and 41 on carton sides 15 and 19 are sealed in cL manne~
23 substan-tially ident.ical to the sealing shown in Figure 6-8 2~ of sealing tab 39 and side 17, three sides of the carbon being 25 sealed in this manner. Each of these sealed sides facilitates;
26 through the use oE a 45 deyree angle bend of the sealed 27 Iportions, the squeezing of the sealed members be~7een the 28 ¦anvil 61 and ultrasonic horn 77.
;~!9 ~2 -14- `
~ ,'"~
`. ~
~ 3~ : :
1 ¦ ~e:Eerrin~ notJ-to ~;~icJur~ 5, -the ef~ec~ of this sealing ~ ¦ method on the car~on corner ~rill be exan-ined. It ~JiIl be 3 ¦ noted through arl exa~ination of Fiqure ~ -that Lhe sealed ~ ¦portion of the carton side walls 15-19 extend ou~wardl~ ~eyond 51 the plane o~ the side lalls 15-l9~ This creates a problem o$
6 ¦ s~retchi~g of the ma-terial at the we~s 53 and 55 as well 71 as a stretching o~ the ma-~erial in the area o~ the score lines 81 43, 45, 47 ~Fi~ure 1) adjacent the webs 53 and 55 since ~he 9 ¦perime~ex dimension is increased~ This s~retching ~as a
11 equal wid-th If ~wo side wall panels are to be o:E aiffe~nt 12 widths tl~an -the othex two, in alternation ~mong t~e four, 13 the xesultin~ carton would be a xectan~ular cross sec~ion 1~ and not square and the end panel 25 would accordingly be 15 r~ctan~ular and not square. Xf tllere were only three side 16 ~7all panels instead of fc,ur, the end panel 25 ~70uld, of 17 course, be triancJular.
18 ~ ~t the remainin~ end of the side ~7all r~anel 13, a top lg end closure panol 27 extenæs (without an inaentation or 20 scoring for delineation) from the s.id2 wall 13. ~he upp~r ~1 end wall 27 is wider than the lower end closure ~5 or side 22 wall 13 ancl, in addi'cion, extends further from the side 23 wall 13 than does the bottom end closure 25. The l~ncJth and 2a width of the end wall 27 is thus yreater than the width of ~n~ of the panels 13--19. This increasecl size is requircd for 26 oYerlapp:Lng scalincJ with the sicl~ wall pan~ls 15-19 as ~7ill be 27 unclerstood as -this description continues.
28 The side wall panels 15, 1~ and 19 eacll ha~e, at -their ~,~J lower ends, sealincJ flays or tabs ~ clc:l..in-al:ea ~y il~dent:ation ~0 or scor inCJ line.~; 3:1 ancl se~>al-atecl Erom one ~nc~thcr by ~ pair .
32 . .
~8~
p~L5~
..
1 of indentation or scoring li~es 33,35 The upper end of each 2 oE the panel~ l5r 17, ~nd 19 is also prov;ded with sealing 3 1aps or tabs 37, 39, and ~1, respectively~ delineated by indentation or scoring lines ~3, ~5, and ~7, respectivel~
~ The prior ar-t would suygest a separation of the tabs 6 37 ~ 39 ~1 r one from ~no~her~ ~n -th;s case r however, ~hey axe ~ connected b~ webs 53 and ~5 OL material. Xt has been found ~hat 8 these score lines 57 and 59 defining the webs prefera~ly ex~en~
9 all the way to the score lines 43 - 47r but could stop som~wha~ -shor~ of those score lines so ~hat the apexes of ~he trian~ular 11 webs 53 and 55 arè spaced slightly from the score lines ~ - 47.
12 Along its free edge, the side wall panel 19 is provîded 13 with ~ sealing tab 49 delineated b~ the indenta-~io~ or.: -14 scoriny line 51.
~inally, in the case o~ a car-~on par~icularl~ adapte~
16 to hold potable li~uids and provid2d internall~ wit~ a sipperr 17 as taug~t ~y Kalajian Patent No. 3,259~297, granted ~ul~ 5, 18 196G, one o~ the side wall panels, for example the side ~Jall lg panel 13~ may be prov.ided with a rectan~ular opening 1~3 ~0 adjacen~ to one end of the panel and extending parallel ~o 21 the long dimension of the side wall 13. The opening is 22 produced by cutting through the side wall panel -~o produce 23 either a flap connected at one end or a complete opening, 2a either of which w~ll support a sipper which is mounted in ~ manner ~lhich permits its rotation ~bou-t one end of -the 26 openingls3 so that it may be extendea from the carton ~uring 27 use.
28 ~ereas with prior designs the ends of the sealing fl~ps 29 37 through ~1 were often cu-t as~ay at an angle, the seal~ng ~iO
_g_ ' '.
1 ¦ flaps 37-~1 of the blank llr as inclic~ed above, remaln connected 2 ¦ to one another b~ V-shaped web sections 53 ~nd 55~ Each of the 3 ¦ scoring lines 57,5.9 i.s at an ancJle of approximately 45 de~rees 4 ¦ with respect to the àdjacen-~ scoring li.nes 21t ~3~ 45~ an~ 47~
~ ¦ Scor;ng lines 57 and 59 typically intersect the scoring lines 21 6 at the scoring lines 43,45,47 to facilitate a righ~ angle-bend between the siae panels 15,1~rl9~
. . The carton is shown in a partially formed condi~io~ in 9 Figure 3 ~ a number o-f steps ha~ing heen accomplished to ~0 bring the car~on -to this stage ~f com~letion. The firs~
1~ step is to bend or flex the several wall panels a~ ~heir 12 scoring lines 21 to bring them around in~o ~he ~orm of an 13 open-ended tube, with the sealing tab 4g on the side wall 1~ panel 1~ inside and overlapping the edge o~ the side wall 1~ panel 13, It is contemplated that the blan~ 11 will be 16 formed of a paper stock coated with polyethylene -to render 17 -i~ impervious to li~uids and the formation o~ the blan~
18 into an open ended tube is accomplished by placing a mandrel 19 insiae of the open ended tube and agains-t the sealing tab 4~, with ultrasonic energy bein~ applied to the exterior sur~ace .
21 of the panel 13 where it overlaps the tab 49, The ultrasonic ~2 energy par-tially melts the polyethylene on ~he t~o surEaces 23 while the surfaces are held in contact with one another under 2~ pressure kill the polyethylene uses to effect a seal bet~Jeen these two sur~aces 2~ After the formation of this open ended tube, the bottom 27 panel 25 can be sealed to the tabs 29 to close the bo~tom of ~he 28 tube. This is generally accom~lished by ~irst folding the 29 tabs 29 toward the interior of the open-encled tube f~r~ea by ~0 ~10- . ,, ' :~
1 the side walls 13 throuyh 19, the score lines 33, 35 forming 2 overlappi.ng corner sections during this Eolding. The end 25 3 is then folded against the bot-tom oE the open-ended tube and, in particular, into àn overlapping relationship with the tabs 29. ~ mandrel is then placed on the inside or outsiaa of the tube and against the overlapping poxtion of the 7 end closure 25 and end tabs 29 and, on the opposite side, 8 an ul-trasonic hoxn is placed against the same overlapping members~
9 Ultrasonic energy is then applied to seal khe polyekhylen~ on the confronting sections. It will b~e sean from the previous 11 description that, in the case of the formation of the tuba as well 12 as ~he closure of the bot~om, it is possible, because there is no 13 liquid within the -tube, and because a portion o~ the ~ube ~emains 1~ open for access, to place a mandrel or anvil within the tube so that a confronting rela-tionship between such a mandrel and an 16 ultrasonic horn can be accomplished, with the parts to be 17 seale~ pinched between these confrontiny me~ers. It is, of 18 course, the object of the presen-t invention to allow ultrasonic 19 sealing of the open upper end of the tube sho-~ in ~i~ure 2 2.0 at a time when liquid fills the carton, 50 that a mandrel or 21 ultraso~ic horn canno-t be placed inside oE the carton 22 This sealing method for the upper closure end 27 is shown in 23 Figure 3. In order to aia in closing the carton, preferably 2~- the upper lid 27 may be folded to a closed position and released, prior to the condition of the carton shown in Figures 2 and 3 r 26 in ~7hat can be considered to be a limbering operation~
~7 Polyethylene coated paperboara tends to have a me~ory so that, 28 ¦when relieved of the flexing pressure, -the closure end 2 29 ¦tends to self~restore a part of the distance toward its 30 I .
~1 32 ~
~
~ ~L la~ 3 1 ori.c~inal position lying i n a plane par~lle:l. to the pl~ne oE
2 the side 13. The posi-tion of ~he closurc end 27 in F~gures 2 3 and 3 is a reasonable representa-tion of ~he a-l:ti tude of this closure end ~7 af ter :~he limbering op~r~tion ana prior to ~being pressed down and sealed. In addition, ~he lid has been pxeEorme~
6 to hawe its marginal portions at all three non-hinged e~ges extend up a~ abou-~ a ~5 degree an~le~ A limbering opera~ion may 8 also be completed on the sealing tabs 37 thrsugh 41, an~ ~h~se tabs ma~ be folded in~araly toward ~he cen~er of -~he open-ended tuba and beyona this point r SO as to lie 1at agains~ ~he u~per 11 por-tion o~ the waIl panels 15 through 19~ ~en xeleased from 12 this position, ~he sealiny tabs 37 through 41 will re~urn 13 par~ially toward the upper end o the car~on, as shown, but will 14 not return ~o a location which would make them coplanar. Ra~herr they remain folded belo~-the level of the upper margin o~ ~he 16 side panels 15-19.
1~ Referring again briefly to Figure 1, it should be noted 18 that, in oraer to fold the upp~r end closure panel 27 and ~he 19 sealing tab 37 extending rom the side panel 15 in separa~e ~0 directions, it is necessary to cut these members apart from Zl one another, as shown by the cut line 60 As will be full~
22 underskood through the description which follows, the cu~
23 line 60.extenas onl~ part-way from the ree edge of the sealing 24 tab 37 to~ard the score line 43, bu~ does not intersec-t ~he score line 73, so that a small lin~ or web of con~inuous, uncu~
~6 material remains between the tab 37 and the end closure 27 panel 27~
28 Referrin~ now to Fi~ure 3, the carton, filled with liquid 29 in its partially cor.lpleted condition as sh~wn in ~i~ure ~ r . . ~ , ,.
~ 3~
~ !i.s placecl in ~l three-siclecl anv.il 61 constructed to conform with 21 the outside' surfaces oE the co~'~ainer and to abut-~he side panels 31 15, 17, and 19. ~ccordingly/ the ~nvil 61 is sho~1n to include ~¦ ~ bac~ ~rame 63 i.nterconnectiny a lower U-shaped section 6 51 and an upper IJ-shaped section 6-/~ As previously stated~ at 61 the time -that the carton is placed into ~he anvil 61, i~ has 7 ¦been previously filled w.ith fluid and the upper ena closure '8 ¦2~ has been partially closed.,' An upper die 69, havin~
¦lower edges con~ormin~,with the u~per edges o the anvil 61~ , ~0 ¦is lowered, as shown by -the arrow 71r onto ~he an~il'61'to '.
11 ¦compress the upper closure end 27 a~ainst ~he sides 13-19 12 ¦of the container, This closuxe operation is best unders~ood 13 ¦by re~erence to ~.igure 6.
1~ ¦ ~s shown in Figure 6, the side wall 17 (~nd each of the 1~¦ other side walls in a similar mannex) is placed in abut~in~
16¦ relationship with -the upper U-shaped section G7 o~ the 17 ¦anvil 61~ The bend formea at the score line 45 between 18¦ the side panel 17 and sealing tab 37 is posi~ioned c~ove 1~¦ a diagonall~ beveled upper edge 73 of the anvil.61~ The uppe~
20¦ ~ie 69 includes a beveled edge J5 con~or~ling with t~le beveled'' 21¦ edge 73r and this edge 75, ~7hen the die 69 is lot~ered and pressed 22¦ onto ~he anvil 67, foxces bo~h the perime~er ed5e o~ ~he upp2r 231 closure end 27, the sealing tab 39 and upper perim~-tex pO~tion 2~1 f -the side panel 17 into abutting relationship, This 251 relationship is sho~m in Figure 7~ t'ne die 69 full~ lowered 26¦ on~o and pressing against the anvil 67 and sc~ueezing the three 27 layers of material 39~27~17 which form the sealing interface 28 at the upper perimetex of the carton.
2~ ~fter the die 69 has been loweled into a scfueezing relationshi ~0 as shown in ~igure 7, it is removecl, anc~ an ultrason;c hoxn 77r 31 having a beveled eage 79 identical to the beveled edge 75~ is -13- .
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~ 3~
1 lo~ered into plac~ on the anvil 67. Ult.rasonic ener~y is 2 applied by the ~lorn 77 to the three layers of ma-teria:l 3~,27,.17 3 to heat the three ]ayers and seal the ~olyethylene coati~
thereon to for}n a sec~led corner edge.
The three layers oE material sealed at the edge lie 6 substantiall~ in a plane designated in Figure 8 b~ numaral 7 81. This plane is inclined at an angle of approxi~.atel~
8 45 degrees wi-th respect ~o both the upper end clvsure 27 9 ana the side wall 17.
It should be noted that, ~hile Figure 3 s~ows the die 11 69 moving stxaight do~n onto the anvil 67 ~as shown by ~he 12 arrow 71), the fact ~hat the die 69 onl~ abuts the anvil 13 61 on three sides may require that the force applie~ to the 14 die also have a hori~ontal component from ric~h-t to let in ~5 Figure 7 as there is no pressure applied by the die at the ~6 hinged eage~ In practice it is found that the xesulting orce 17 on the die in ~i~ure 7 should be diagonally down and left~ It 18 may be preferable ~or the die 69 to reciprocate in a diagonal 19 direction down and to the left in Figure 7 a-t an appropriate 2.0 angle, to equalize the fo~ces between these members. It 21 should also be recognized that the remaining two sealing tabs 22 37 and 41 on carton sides 15 and 19 are sealed in cL manne~
23 substan-tially ident.ical to the sealing shown in Figure 6-8 2~ of sealing tab 39 and side 17, three sides of the carbon being 25 sealed in this manner. Each of these sealed sides facilitates;
26 through the use oE a 45 deyree angle bend of the sealed 27 Iportions, the squeezing of the sealed members be~7een the 28 ¦anvil 61 and ultrasonic horn 77.
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1 ¦ ~e:Eerrin~ notJ-to ~;~icJur~ 5, -the ef~ec~ of this sealing ~ ¦ method on the car~on corner ~rill be exan-ined. It ~JiIl be 3 ¦ noted through arl exa~ination of Fiqure ~ -that Lhe sealed ~ ¦portion of the carton side walls 15-19 extend ou~wardl~ ~eyond 51 the plane o~ the side lalls 15-l9~ This creates a problem o$
6 ¦ s~retchi~g of the ma-terial at the we~s 53 and 55 as well 71 as a stretching o~ the ma-~erial in the area o~ the score lines 81 43, 45, 47 ~Fi~ure 1) adjacent the webs 53 and 55 since ~he 9 ¦perime~ex dimension is increased~ This s~retching ~as a
10 ¦tendenc~ to rup~u~e or tear the ~aterial a~ ~he cornersO
~1 j~his tendency is reauced b~ a large radius corner bead 83 shown 1~ ¦protruding ~rom the corner of the anvil 61 at the lowe~
13 ¦extremu-t~ of the beveled edge 73, This protxuding co~ne~ bead 83 1~¦ is reproduced iden-tically in each of -~he two corners o~ the ~5 anvil 61 and producea in the tsJo corners 87 and 89 ~Figure ~) 16 ¦an indentation in th2 carton corner just below the sealin~
17 ¦lip~ As shown in Figure 5, this indentation 85 reduces to 18 ¦neglegible size, or even zeror the dimension ~l.by which the 19 I sealed lip ~3 of the carton must extend beyond the side wall.
20 ¦lS o~ the carkon for a preae~ermined length 9S of sealed lip 2~ ¦ 93D The corner bead 83 also provides a larger radius bend a~
~2 ¦each o~ the carton corners 87t89r which greatly facilita~es the 23 ¦use o~ ultrasonic energ~ ~r sealing 2~ ¦ ~he extension 91 of lip 93 beyond the wall 15 determines 25 ¦the extent to which the corners 87 and 8~ (Figure ~) of ~he 26 ¦carton are stretched during the sealing process, As can be 27 ¦seen from Figure 4, the upper end closure 27 of the carton 11 28 ¦is compressed during -the sealing operation, whereas the side 29 ¦wall portions 15, 17, and 19 are each expanded at the sealed 30 Icorners ~7 and 89. If this expansion is sufficient, it will.
32 ~ ~15-. . ~:
~ ~
~ 3~3 1 ! rup-ture the corners a~ the seal (a~ ~7ebs 53~55~ and cause a 2 lea~ in t.he container, The indentcltion S5 permits a wide 3 ¦ sealinc~ lip 93 with an ~nlarged radius a-t its cornersr while ¦ limiting or elimina~ing this Pxtension 91~
5 ¦ As is bes-t seen in Figure ~r the co.rner 97 ~ormed be~ween .
¦ the sides 13 and 15 must also seal with the end closure ~7, and q this seal is most difficult a~ ~he cut line 60 formR~ in ~he .8 carton blank be-tween -the en~ ta~ 37 and the end closure 27 9 B~ maXin~ this cut line 60 end ~hort of the score line 43 ~Figure 1), at whi.ch the sealing tab 37 i5 ben~, it is pos~ible
~1 j~his tendency is reauced b~ a large radius corner bead 83 shown 1~ ¦protruding ~rom the corner of the anvil 61 at the lowe~
13 ¦extremu-t~ of the beveled edge 73, This protxuding co~ne~ bead 83 1~¦ is reproduced iden-tically in each of -~he two corners o~ the ~5 anvil 61 and producea in the tsJo corners 87 and 89 ~Figure ~) 16 ¦an indentation in th2 carton corner just below the sealin~
17 ¦lip~ As shown in Figure 5, this indentation 85 reduces to 18 ¦neglegible size, or even zeror the dimension ~l.by which the 19 I sealed lip ~3 of the carton must extend beyond the side wall.
20 ¦lS o~ the carkon for a preae~ermined length 9S of sealed lip 2~ ¦ 93D The corner bead 83 also provides a larger radius bend a~
~2 ¦each o~ the carton corners 87t89r which greatly facilita~es the 23 ¦use o~ ultrasonic energ~ ~r sealing 2~ ¦ ~he extension 91 of lip 93 beyond the wall 15 determines 25 ¦the extent to which the corners 87 and 8~ (Figure ~) of ~he 26 ¦carton are stretched during the sealing process, As can be 27 ¦seen from Figure 4, the upper end closure 27 of the carton 11 28 ¦is compressed during -the sealing operation, whereas the side 29 ¦wall portions 15, 17, and 19 are each expanded at the sealed 30 Icorners ~7 and 89. If this expansion is sufficient, it will.
32 ~ ~15-. . ~:
~ ~
~ 3~3 1 ! rup-ture the corners a~ the seal (a~ ~7ebs 53~55~ and cause a 2 lea~ in t.he container, The indentcltion S5 permits a wide 3 ¦ sealinc~ lip 93 with an ~nlarged radius a-t its cornersr while ¦ limiting or elimina~ing this Pxtension 91~
5 ¦ As is bes-t seen in Figure ~r the co.rner 97 ~ormed be~ween .
¦ the sides 13 and 15 must also seal with the end closure ~7, and q this seal is most difficult a~ ~he cut line 60 formR~ in ~he .8 carton blank be-tween -the en~ ta~ 37 and the end closure 27 9 B~ maXin~ this cut line 60 end ~hort of the score line 43 ~Figure 1), at whi.ch the sealing tab 37 i5 ben~, it is pos~ible
11 to leave a shoxt web of material between the end closure 27 ana
12 tab 37 extending toward -the center of the carton a~a~ns-~ which
13 ~he end closuxe 27 can be sealed in order to preven~ an~ leaks
14 at this corner, As is best seen in Figure 4~ the sealing lip 93 extending l~ aroun~ three sides of -the upper perimeter of the carton 11 17 at a 45 dec~ree angle from the plane o~ the upper closure end 18 27 facilitates nesting of the botto~ of one carton 11 ~ithin 19 the peri~eter of the top of a lower car~on 90, when the cartons 11 and 90 are to be transported, as in a larger receptacler 21 stac~ed one on top o~ the other~
22 Throughout ~he description o~ this invention it has been 23 assumed that the carton, pxior to beinc3 placed în the anvil 61, 2~ haa been filled with a liquid 99 and that a sipper 101 ~ad been attached and sealea ~Jithin the opening 53, as shown in ~igure 4~
26 so tha-t the carton 11 is closed e~cep~ for the uppex closure end 2~ 27, and ~illed.
28 While this embodiment is described as using a mandrel to 2~
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~ .
1 form the carton seclling arrangement prior to use o-f a..horn, 2 alternatively the ultrasoni.c horn can perform both functions 3 in a single step; especially if the horn is mounted or diagonal 4 movement as discussed above.
The oregoing fea-tures will now be related specifically 6 to the requirements oE ultrasonically sealing the paperboard 7 cartons. Referring first to Figure 5t tha anvil 61, shown in croC s-8 section, has its lip 73 extending out at approximately 9 a 45 degree angle instead a~ straight out. In ~igure 3~
the lip 73 is shown to be con-tinuous and unbroken in its support oE the paperboard carton sealing tab comprising ~he continuous 12 sections 41, 39, and 37. Figure 3 and Figure 4 clearly 13 show that -the continuous lip 73 of the anvil 61 extends 14 away ~rom the body.o ~he anvil 61 a very short distance so that the sealing tabs have a very small indentation 16 85 formed as a result of the pressing o the lip against 17 the side panel, as illustrated in Figure 5. If, on the 18 other hand, the lip 73, as illustrated in Eligure 5, were ~9 to extend away from the body 61 of the anvil at right angles and for a substantial distance, such a lip would - ¦
21 be more susceptible of vibrating with the ultrasonic horn 22 69, instead of remaining static, such that very little 23 . heat would be imparted to the sealing tab placed 24 between the horn 69 and the anvil 61. Also, the larger indentation effected by such a lip would be more likely 26 to cause a tear in the corner 83 of the sealing tab. Thus, 27 the lip 73 is de~ined, as shown in Figure 5, to extend a 28 short distance at approximately a 45 degree angle. In order 29 to avoid Eorming a tear be-tween adjacent sealin tabs 37, 31 39, 41, the anvil is provided with a gradual radius on 32 .
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~ :
1 ¦ its lip in the vicinity of the corners between adjacen-t 2 ¦ sealing tabs, as illus-trated at 83 in ~igure 3. Thus, 3 ¦ instead of tearing the sealing tabs in the vicinity of * ¦ these corners 53 and 55, the sealing tabs are s-tretched 5 ¦ instead by the lip 73 in the vicinity of the corners 83.
6 ¦ Thus, the invention provi~es a continuous sealing tab which is 7 ¦ supported ~y a small indenting lip provided on an anvil ¦ having a unique configuration minimizing vibration in the 9 ¦ lip and eliminating tearing between a~jacent sealing ta~s 10 ¦ of the carton. Because the lip exten~s diagonally away 1~ ¦ from the anvil body, the sealing tabs are sealed at a 12 ¦ diagonal with the top end closure panel corresponding 13 ¦ to the diagonal along which the face of the sealing lip 73 14 ¦ of the anvil is formed. Figure 6 and Figure 7 clearly show 1~ ¦ the sequence during which the sealing lip is bent from a straight 16 ¦ configuration, as shown in ~igure 6 to a diagonal configuration 17 ¦ in Figure 7 corresponding to the diagonal along which the 18 ~ace of the lip 73 extends.
19 The invention has three features which prevent breakage of the continuous sealing tabs of the carton.
21 These features are directed to the area in which the stress 22 is a maximum amount, namely the outer corner edges 87 and 89, 23 as shown in Figure 5. The firs-t feature is the double fold of 24 the perimeter edges to form two layers, as clearly shown in Figure 5. Thus~ the stress is at a maximum along a folded 26 portion 93 as shown in Figure 5 and not along an outer edge 27 of the sealing tab. This reduces the probability of tearing 28 in the vicinity of the corners 87, 89, because the stress 29 occurs in a region interior of the edges of the sealing tabs. The edges of the sealing tabs are more susceptible ~ ~
~ .
1 -to tearing~ Thus, the double fold oF applicant's 2 invention eliminates any dependence upon the strength o~
3 ¦ ~he sealing tabs in ~he vicinity of their edges~ A second 4 ¦ feature which contribu-tes to the continuity of the sealing ~ ~ tabs is clearly shown in Figure 5 in which the length 91 o the 6 I extension o-E the co.rner 89 of the sealing tab beyond the side 7 ¦ wall panels 15 is kept to a minim~n by a proper selection o~
8 the configuration o the anvills sealing lip 73~ This 9 ¦ eliminates the amount of stre~ching and strain inauced in 10 ¦ the corner region 897 The amount of strain indùced in t~a 1~ ¦ corner region 89 is proportional to the distance 91 which 12 ¦ the corner 89 of the sealing tabs 41, 39, and 43 e~tends 13 beyond the adjacent side wall panel 15, as shown in Figure 5.
14 ¦ Thus, minimization of the extending length 91 minimizes the strain and helps to prevent -tear.ing of the sealing tabO The ~6 third eature which helps to prevent tearing between the sealing 1~ tabs 37, 39, and 41 in the vicinity of the corners 89 and 87 18 is the large radii 83 provided on the sealing lip 73 in the 19 vi~inity of the corners 87 and 89. These radii 83 reduce stress in the vicinity of the corners 85 of the inden~ation 21 in the sealing tabs in the carton by providing a more gradual 22 ~i foldin ~ the sealing tab to iorm the corners 87, 89.
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22 Throughout ~he description o~ this invention it has been 23 assumed that the carton, pxior to beinc3 placed în the anvil 61, 2~ haa been filled with a liquid 99 and that a sipper 101 ~ad been attached and sealea ~Jithin the opening 53, as shown in ~igure 4~
26 so tha-t the carton 11 is closed e~cep~ for the uppex closure end 2~ 27, and ~illed.
28 While this embodiment is described as using a mandrel to 2~
~0 ' . ' ',' ` '~ ~' ~'` ,`.
~ .
1 form the carton seclling arrangement prior to use o-f a..horn, 2 alternatively the ultrasoni.c horn can perform both functions 3 in a single step; especially if the horn is mounted or diagonal 4 movement as discussed above.
The oregoing fea-tures will now be related specifically 6 to the requirements oE ultrasonically sealing the paperboard 7 cartons. Referring first to Figure 5t tha anvil 61, shown in croC s-8 section, has its lip 73 extending out at approximately 9 a 45 degree angle instead a~ straight out. In ~igure 3~
the lip 73 is shown to be con-tinuous and unbroken in its support oE the paperboard carton sealing tab comprising ~he continuous 12 sections 41, 39, and 37. Figure 3 and Figure 4 clearly 13 show that -the continuous lip 73 of the anvil 61 extends 14 away ~rom the body.o ~he anvil 61 a very short distance so that the sealing tabs have a very small indentation 16 85 formed as a result of the pressing o the lip against 17 the side panel, as illustrated in Figure 5. If, on the 18 other hand, the lip 73, as illustrated in Eligure 5, were ~9 to extend away from the body 61 of the anvil at right angles and for a substantial distance, such a lip would - ¦
21 be more susceptible of vibrating with the ultrasonic horn 22 69, instead of remaining static, such that very little 23 . heat would be imparted to the sealing tab placed 24 between the horn 69 and the anvil 61. Also, the larger indentation effected by such a lip would be more likely 26 to cause a tear in the corner 83 of the sealing tab. Thus, 27 the lip 73 is de~ined, as shown in Figure 5, to extend a 28 short distance at approximately a 45 degree angle. In order 29 to avoid Eorming a tear be-tween adjacent sealin tabs 37, 31 39, 41, the anvil is provided with a gradual radius on 32 .
-17~
~ :
1 ¦ its lip in the vicinity of the corners between adjacen-t 2 ¦ sealing tabs, as illus-trated at 83 in ~igure 3. Thus, 3 ¦ instead of tearing the sealing tabs in the vicinity of * ¦ these corners 53 and 55, the sealing tabs are s-tretched 5 ¦ instead by the lip 73 in the vicinity of the corners 83.
6 ¦ Thus, the invention provi~es a continuous sealing tab which is 7 ¦ supported ~y a small indenting lip provided on an anvil ¦ having a unique configuration minimizing vibration in the 9 ¦ lip and eliminating tearing between a~jacent sealing ta~s 10 ¦ of the carton. Because the lip exten~s diagonally away 1~ ¦ from the anvil body, the sealing tabs are sealed at a 12 ¦ diagonal with the top end closure panel corresponding 13 ¦ to the diagonal along which the face of the sealing lip 73 14 ¦ of the anvil is formed. Figure 6 and Figure 7 clearly show 1~ ¦ the sequence during which the sealing lip is bent from a straight 16 ¦ configuration, as shown in ~igure 6 to a diagonal configuration 17 ¦ in Figure 7 corresponding to the diagonal along which the 18 ~ace of the lip 73 extends.
19 The invention has three features which prevent breakage of the continuous sealing tabs of the carton.
21 These features are directed to the area in which the stress 22 is a maximum amount, namely the outer corner edges 87 and 89, 23 as shown in Figure 5. The firs-t feature is the double fold of 24 the perimeter edges to form two layers, as clearly shown in Figure 5. Thus~ the stress is at a maximum along a folded 26 portion 93 as shown in Figure 5 and not along an outer edge 27 of the sealing tab. This reduces the probability of tearing 28 in the vicinity of the corners 87, 89, because the stress 29 occurs in a region interior of the edges of the sealing tabs. The edges of the sealing tabs are more susceptible ~ ~
~ .
1 -to tearing~ Thus, the double fold oF applicant's 2 invention eliminates any dependence upon the strength o~
3 ¦ ~he sealing tabs in ~he vicinity of their edges~ A second 4 ¦ feature which contribu-tes to the continuity of the sealing ~ ~ tabs is clearly shown in Figure 5 in which the length 91 o the 6 I extension o-E the co.rner 89 of the sealing tab beyond the side 7 ¦ wall panels 15 is kept to a minim~n by a proper selection o~
8 the configuration o the anvills sealing lip 73~ This 9 ¦ eliminates the amount of stre~ching and strain inauced in 10 ¦ the corner region 897 The amount of strain indùced in t~a 1~ ¦ corner region 89 is proportional to the distance 91 which 12 ¦ the corner 89 of the sealing tabs 41, 39, and 43 e~tends 13 beyond the adjacent side wall panel 15, as shown in Figure 5.
14 ¦ Thus, minimization of the extending length 91 minimizes the strain and helps to prevent -tear.ing of the sealing tabO The ~6 third eature which helps to prevent tearing between the sealing 1~ tabs 37, 39, and 41 in the vicinity of the corners 89 and 87 18 is the large radii 83 provided on the sealing lip 73 in the 19 vi~inity of the corners 87 and 89. These radii 83 reduce stress in the vicinity of the corners 85 of the inden~ation 21 in the sealing tabs in the carton by providing a more gradual 22 ~i foldin ~ the sealing tab to iorm the corners 87, 89.
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Claims (13)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of closing the top end of a carton comprising:
forming a carton as a tube having a polygonal cross-section and a closed bottom end, said carton having plural substantially flat side panels, one of which extends above the others, to form a polygonal top end closure panel, each of said others having a top perimeter edge which extends, unbroken, through the entire width of said side panel and, unbroken, into the top edge of an adjacent side panel;
filling said carton with a liquid;
folding said top end closure panel with respect to said one of said flat sides to a position wherein said top panel is substantially perpendicular to each of said side panels;
pressing the perimeter edges of said top panel and said top edges of said other side panels together to crease said perimeter and top edges into a mutually aligned, face-to-face, sealing relationship, both said perimeter and said top edges being continuous and unbroken throughout their length; and inducing ultrasonic energy into said perimeter and top edges to seal said end closure panel to said others of said side panels.
forming a carton as a tube having a polygonal cross-section and a closed bottom end, said carton having plural substantially flat side panels, one of which extends above the others, to form a polygonal top end closure panel, each of said others having a top perimeter edge which extends, unbroken, through the entire width of said side panel and, unbroken, into the top edge of an adjacent side panel;
filling said carton with a liquid;
folding said top end closure panel with respect to said one of said flat sides to a position wherein said top panel is substantially perpendicular to each of said side panels;
pressing the perimeter edges of said top panel and said top edges of said other side panels together to crease said perimeter and top edges into a mutually aligned, face-to-face, sealing relationship, both said perimeter and said top edges being continuous and unbroken throughout their length; and inducing ultrasonic energy into said perimeter and top edges to seal said end closure panel to said others of said side panels.
2. A method of closing the top end of a carton comprising:
forming a tube having a polygonal cross-section and a closed bottom end to form a carton having plural substantially flat side panels, one of which extends above the others, to form a top end closure panel, said other side panels each including an upper portion, adjacent ones of said upper portions having common edges;
filling said carton with liquid;
folding said top end closure panel with respect to said one of said flat side panels to a position wherein said top panel is substantially perpendicular to each of said side panels;
folding said upper portions of said others of said side panels inwardly to be disposed within the interior of said tube without separating said common edges;
pressing the perimeter edges of said top end closure panel against said upper portions to crease said perimeter edges of said top end closure panel in an abutting relationship with said upper portions without separating said common edges;
and inducing ultrasonic energy into said perimeter edges and said upper portions to seal said top end closure panel to said others of said side panels.
forming a tube having a polygonal cross-section and a closed bottom end to form a carton having plural substantially flat side panels, one of which extends above the others, to form a top end closure panel, said other side panels each including an upper portion, adjacent ones of said upper portions having common edges;
filling said carton with liquid;
folding said top end closure panel with respect to said one of said flat side panels to a position wherein said top panel is substantially perpendicular to each of said side panels;
folding said upper portions of said others of said side panels inwardly to be disposed within the interior of said tube without separating said common edges;
pressing the perimeter edges of said top end closure panel against said upper portions to crease said perimeter edges of said top end closure panel in an abutting relationship with said upper portions without separating said common edges;
and inducing ultrasonic energy into said perimeter edges and said upper portions to seal said top end closure panel to said others of said side panels.
3. A method for closing the top end of a carton previously formed as a tube having a polygonal cross-section and a closed bottom end and previously filled with liquid, said carton having plural substantially flat side panels, one of which extends above the others, to form a top end closure panel, comprising:
folding said top end closure panel with respect to said one of said flat sides to a position wherein said top panel is substantially perpendicular to each of said side panels;
folding the top portion of some of said side panels within the interior of said tube to extend over themselves and to form an uninterrupted perimeter sealing edge adjacent said top end of said carton;
pressing the perimeter edges of said top end closure panel against said uninterrupted perimeter sealing edge of said side panels to tightly abut said perimeter edges of said top end closure panel with said uninterrupted perimeter sealing edge; and inducing ultrasonic energy into said perimeter edges of said top end closure panel and said perimeter sealing edge of said side panels to generate heat along the abutment area of said perimeter edges and said perimeter sealing edge to seal said top end closure panel to said side panels.
folding said top end closure panel with respect to said one of said flat sides to a position wherein said top panel is substantially perpendicular to each of said side panels;
folding the top portion of some of said side panels within the interior of said tube to extend over themselves and to form an uninterrupted perimeter sealing edge adjacent said top end of said carton;
pressing the perimeter edges of said top end closure panel against said uninterrupted perimeter sealing edge of said side panels to tightly abut said perimeter edges of said top end closure panel with said uninterrupted perimeter sealing edge; and inducing ultrasonic energy into said perimeter edges of said top end closure panel and said perimeter sealing edge of said side panels to generate heat along the abutment area of said perimeter edges and said perimeter sealing edge to seal said top end closure panel to said side panels.
4. A method of closing the top end of a carton as defined in claim 3, wherein said folding step folds the top edges of said side panels immediately adjacent said top end closure panel.
5. A method of closing the top end of a carton as defined in claim 3, wherein said folding step further comprises indenting the corners of said top portion of adjacent ones of said some of said side panels to reside beneath the remaining portion of said top portion and avoid tearing of said uninterrupted perimeter sealing edge.
6. A method of closing the top end of a carton comprising:
forming a carton as a tube having a polygonal cross-section and a closed bottom end, said carton having plural substantially flat side panels which are mutually perpendicular throughout their length, one of which extends above the others, to form a top end closure panel, each of said others of said side panels having a top perimeter edge portion which extends unbroken through the width of said other side panels and unbroken into the top edge portion of an adjacent side panel;
filling said carton with a desired material; folding said top end closure panel with respect to said one of said flat side panels to a position wherein said top panel is substantially perpendicular to each of said side panels;
folding said top edge portion of said others of said side panels into a plane diagonal to the plane of a respective one of said others of said side panels to form an unbroken, uninterrupted sealing tab extending along each of said others of said side panels;
pressing the perimeter edges of said top end closure panel against said sealing tab to abut said perimeter edges upon said sealing tab along said diagonal plane; and inducing ultrasonic energy into said perimeter edges and said sealing tab maintaining said sealing tab stationary to produce heat sufficient to seal said edges to said sealing tab along said diagonal plane.
forming a carton as a tube having a polygonal cross-section and a closed bottom end, said carton having plural substantially flat side panels which are mutually perpendicular throughout their length, one of which extends above the others, to form a top end closure panel, each of said others of said side panels having a top perimeter edge portion which extends unbroken through the width of said other side panels and unbroken into the top edge portion of an adjacent side panel;
filling said carton with a desired material; folding said top end closure panel with respect to said one of said flat side panels to a position wherein said top panel is substantially perpendicular to each of said side panels;
folding said top edge portion of said others of said side panels into a plane diagonal to the plane of a respective one of said others of said side panels to form an unbroken, uninterrupted sealing tab extending along each of said others of said side panels;
pressing the perimeter edges of said top end closure panel against said sealing tab to abut said perimeter edges upon said sealing tab along said diagonal plane; and inducing ultrasonic energy into said perimeter edges and said sealing tab maintaining said sealing tab stationary to produce heat sufficient to seal said edges to said sealing tab along said diagonal plane.
7. A method of closing the top end of a carton as defined in claim 6, wherein said diagonal plane is at a 45-degree angle to said top panel and said side panels.
8. A method for closing the top end of a carton comprising:
forming a carton as a tube having a polygonal cross-section and a closed bottom end, said carton having plural substantially flat side panels integral with one another at adjoining side edges, one of which extends above the others, to form a top end closure panel;
filling said carton with a desired content;
folding the top portion of some of said side panels into a plane diagonal to the plane of a respective one of said some of said side panels to form an uninterrupted sealing surface;
pressing the perimeter edges of said top panel against said uninterrupted sealing surface to position said top panel relative said side panels so that said perimeter edges abut said uninterrupted sealing surface along said diagonal plane and the remaining portion of said top panel is disposed beneath the top edge of said side panels in a plane substantially perpendicular to said side panels; and inducing ultrasonic energy into said perimeter edges of said top panel and said uninterrupted sealing surface of said some of said side panels to seal said top panel to said some of said side panels along said diagonal plane.
forming a carton as a tube having a polygonal cross-section and a closed bottom end, said carton having plural substantially flat side panels integral with one another at adjoining side edges, one of which extends above the others, to form a top end closure panel;
filling said carton with a desired content;
folding the top portion of some of said side panels into a plane diagonal to the plane of a respective one of said some of said side panels to form an uninterrupted sealing surface;
pressing the perimeter edges of said top panel against said uninterrupted sealing surface to position said top panel relative said side panels so that said perimeter edges abut said uninterrupted sealing surface along said diagonal plane and the remaining portion of said top panel is disposed beneath the top edge of said side panels in a plane substantially perpendicular to said side panels; and inducing ultrasonic energy into said perimeter edges of said top panel and said uninterrupted sealing surface of said some of said side panels to seal said top panel to said some of said side panels along said diagonal plane.
9. A method for closing the top end of a carton previously formed as a tube having a polygonal cross-section and a closed bottom end and previously filled with liquid, said carton having plural substantially flat side panels, one of which extends above the others, to form a top end closure panel, comprising:
folding said top end closure panel with respect to said one of said flat sides to a position wherein said top panel is substantially perpendicular to each of said side panels;
folding the top portion of some of said side panels to extend over itself and form a double thickness unbroken perimeter sealing surface upon said some of said side panels;
pressing the perimeter edges of said top panel and said double thickness unbroken perimeter sealing surface of said some of said side panels together along a plane diagonal to the plane of a respective one of said some of said side panels; and inducing ultrasonic energy into said perimeter edges of said top panel and said continuous perimeter sealing surface of said side panels to seal said top panel to said some of said side panels along said diagonal plane.
folding said top end closure panel with respect to said one of said flat sides to a position wherein said top panel is substantially perpendicular to each of said side panels;
folding the top portion of some of said side panels to extend over itself and form a double thickness unbroken perimeter sealing surface upon said some of said side panels;
pressing the perimeter edges of said top panel and said double thickness unbroken perimeter sealing surface of said some of said side panels together along a plane diagonal to the plane of a respective one of said some of said side panels; and inducing ultrasonic energy into said perimeter edges of said top panel and said continuous perimeter sealing surface of said side panels to seal said top panel to said some of said side panels along said diagonal plane.
10. A method of closing the top end of a carton as defined in claim 9, wherein said top portion folding step folds said top portion of said flat side panels toward the inside of said carton.
11. A method of closing the top end of a carton as defined in claim 9, wherein during said pressing step said top portion of said side panels are stretched in one direction to have a longer dimension in that direction than they had prior to said pressing step.
12. A method of closing the top end of a carton as defined in claim 9, wherein said pressing step presses the corners of said double thickness perimeter sealing surface formed at adjoining one of said some of said side panels along a radius to relieve stress and avoid tearing of said double thickness perimeter sealing surface.
13. A method of closing the top end of a carton as defined in claim 12, wherein said top portion folding step minimizes the distance which the folded corner edge of said double thickness perimeter sealing surface extends beyond the planes of said flat side panels to relieve stress and avoid tearing said double thickness unbroken perimeter sealing surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000425452A CA1177803A (en) | 1978-06-02 | 1983-04-07 | Paperboard carton |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US91199078A | 1978-06-02 | 1978-06-02 | |
| US911,990 | 1978-06-02 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000425452A Division CA1177803A (en) | 1978-06-02 | 1983-04-07 | Paperboard carton |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1156988A true CA1156988A (en) | 1983-11-15 |
Family
ID=25431229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000316882A Expired CA1156988A (en) | 1978-06-02 | 1978-11-27 | Method of closing the top end of a carton |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS555375A (en) |
| CA (1) | CA1156988A (en) |
| DE (1) | DE2900625A1 (en) |
| FR (1) | FR2427253B1 (en) |
| GB (2) | GB2022507B (en) |
| IT (1) | IT1109335B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4569474A (en) * | 1979-12-04 | 1986-02-11 | Pneumatic Scale Corporation | Continuous sealing rim for carton |
| DE3229076A1 (en) * | 1981-08-07 | 1983-03-24 | Pola Chemical Industries, Inc., Shizuoka | METHOD AND DEVICE FOR WELDING THE BOTTOM OF A TUBULAR RESIN CONTAINER |
| FR2523073A1 (en) * | 1982-03-12 | 1983-09-16 | Cazas Ets | Support for food receptacle - has lid welded on by ultrasonic head against rigid support plate |
| DK169691A (en) * | 1991-10-03 | 1993-07-02 | Schouw Packing As | Translucent screen for illumination from behind |
| DE102013225737A1 (en) | 2013-12-12 | 2015-06-18 | Robert Bosch Gmbh | Method for producing a packaging and packaging machine |
| CN109502101B (en) * | 2018-11-19 | 2020-11-24 | 嵊州市东浦天地彩印包装有限公司 | Sealing device for color printing packaging |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2453397A (en) * | 1947-04-26 | 1948-11-09 | Joslyn Mfg And Supply Corp | Fuse link |
| US2891453A (en) * | 1954-12-20 | 1959-06-23 | Bergstein Packaging Trust | Method of making dispensing containers having strong end closures |
| US3060652A (en) * | 1956-11-30 | 1962-10-30 | American Can Co | Process for sealing containers |
| FR1290321A (en) * | 1961-03-03 | 1962-04-13 | Improvements to cardboard packaging and the like | |
| US3098599A (en) * | 1961-08-24 | 1963-07-23 | Roy S Sanford & Company | Carton |
| US3163973A (en) * | 1962-04-09 | 1965-01-05 | Lily Tulip Cup Corp | Cup sealing apparatus |
| US3525465A (en) * | 1968-09-09 | 1970-08-25 | United States Steel Corp | Hermetic container |
| US4011984A (en) * | 1975-11-03 | 1977-03-15 | Nolex Corporation | Carton blank, carton and method of forming carton |
| US4037370A (en) * | 1975-11-03 | 1977-07-26 | Nolex Corporation | Carton closing and sealing apparatus |
| ZA77281B (en) * | 1976-01-28 | 1977-11-30 | Ex Cell O Corp | Apparatus and method for vibration sealing |
-
1978
- 1978-11-27 CA CA000316882A patent/CA1156988A/en not_active Expired
- 1978-12-01 GB GB7846791A patent/GB2022507B/en not_active Expired
- 1978-12-01 GB GB08137045A patent/GB2101564B/en not_active Expired
- 1978-12-16 JP JP15566078A patent/JPS555375A/en active Pending
- 1978-12-21 IT IT52412/78A patent/IT1109335B/en active
- 1978-12-27 FR FR7836558A patent/FR2427253B1/en not_active Expired
-
1979
- 1979-01-09 DE DE19792900625 patent/DE2900625A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| IT1109335B (en) | 1985-12-16 |
| FR2427253B1 (en) | 1985-09-27 |
| JPS555375A (en) | 1980-01-16 |
| GB2101564A (en) | 1983-01-19 |
| DE2900625A1 (en) | 1979-12-13 |
| IT7852412A0 (en) | 1978-12-21 |
| GB2022507A (en) | 1979-12-19 |
| FR2427253A1 (en) | 1979-12-28 |
| GB2022507B (en) | 1983-02-16 |
| GB2101564B (en) | 1983-06-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |