US3422730A - Container fabricating apparatus - Google Patents

Container fabricating apparatus Download PDF

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Publication number
US3422730A
US3422730A US599768A US3422730DA US3422730A US 3422730 A US3422730 A US 3422730A US 599768 A US599768 A US 599768A US 3422730D A US3422730D A US 3422730DA US 3422730 A US3422730 A US 3422730A
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US
United States
Prior art keywords
container
mandrel
pressure pad
pressure
bottom closure
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 - Lifetime
Application number
US599768A
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English (en)
Inventor
Richard C Mitzelfelt
Leigh D Leiter
John E Junod
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Paper Co
Original Assignee
International Paper Co
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Filing date
Publication date
Application filed by International Paper Co filed Critical International Paper Co
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Publication of US3422730A publication Critical patent/US3422730A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/60—Uniting opposed surfaces or edges; Taping
    • B31B50/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding
    • B31B50/642—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding using sealing jaws or sealing dies

Definitions

  • This invention relates to the fabrication of paperboard containers, and in particular to the fabrication of the bottom closure of paperboard containers.
  • Paperboard containers are ⁇ widely used for packaging a variety of products, including foods and beverages, one well known paperboard container being the so-called gable top container of the type shown in C. R. Alden Patent No. 2,750,095, issued June 12, 1956.
  • Such containers are typically erected or assembled from blanks of a predetermined geometrical conguration which have been cut from a roll of paper sheet stock having a coating of a protective thermoplastic material such as wax or polyethylene. Also, score lines are impressed on the blanks to deline the to-p closure, bottom closure, and sidewall elements of the assembled container.
  • a paperboard container of this type is assembled on automatic machinery by folding and sealing a blank into a tubular body open at both ends, sealing together the bottom closure panels of the blank, lling the container with the desired product, and finally sealing together the gable top closure panels of the blank.
  • Increased pressure may be applied to selected areas of a container during the sealing operation by constructing the surface of the mandrel end to be flat, and by constructing the surface of the pressure pad to have raised areas and projecting pressure stakes. In this manner, more pressure is applied to those portions of the bottom closure structure which are pressed between the mandrel end and the raised areas and stakes of the pressure pad than to the other portions of the bottom closure structure.
  • the application of pressure on the bottom closure panels between the mandrel and pressure pad tends to force overlapping plies of the bottom closure elements outward, that is, toward the exterior of the container, wherever the lat mandrel end opposes unraised or relieved portions of the pressure pad surface, thereby to form bulges on the exterior surface of the container bottom.
  • These bulges on the bottom of the completed container are undesirable because they are likely to receive relatively more wear and scuing than other portions of the bottom.
  • the presence of bulges on the container bottom tends to make the container somewhat unstable, which not only is an undesirable characteristic from the standpoint of consumer acceptance but also contributes to excessive wear and scutln g of the container bottom.
  • a unique mandrel and pressure pad arrangement which produces a strong, leak-resistant bottom closure having a relatively at outer surface without requiring highly accurate alignment between mandrel end and pressure pad.
  • the surface of the pressure pad of this invention is totally at except for projecting pressure stakes, and the surface of the opposing mandrel end is divided into a pattern of relieved and unrelieved areas corresponding to the pattern of multiple layer areas of various thickness in a particular, folded bottom closure.
  • tubular carton blank is positioned over the mandrel end before the bottom closure is sealed, by providing the pattern of relieved and unrelieved areas in the surface of the mandrel end rather than in the surface of the pressure pad, a more positive and more consistent alignment is established between the pattern of overlapping plies of various thicknesses in the folded bottom closure and the corresponding relieved and lunrelieved areas.
  • This more positive alignment not only results in more accurate application of increased pressure to those portions of the bottom which require it, rwhich results in better sealing of the bottom closure elements, but also makes the accuracy of the alignment between the pressure pad and the mandrel end substantially less critical.
  • the more positive alignment between overlapping plies of various thicknesses in the folded bottom closure and the relieved and unrelieved portions of the mandrel end surface also permits more effective blocking of potential leak paths by the projecting pressure stakes in the pressure pad.
  • more effective blocking is obtained because of the formation of a relatively flat outer surface of the bottom closure which thereby allows the pressure sta-kes in the pressure pad to penetrate relatively evenly into the outer surface of the container bottom rather than differentially over steps or folds in the bulged portions of the outer surface of conventionally formed bottom closures.
  • Another important feature of the pressure pad of this invention is the construction of the projecting pressure stakes to have specialized Iblade edges to block potential leak paths in different folds in the bottom closure panels.
  • each of those stakes which must reach especially remote potential leak paths is provided with a relatively sharp blade edge having two substantially planar sides which include an angle of about ninety degrees and a 'greater height than any of the other stakes.
  • those stakes which have a reduced force available to them for example, those in the proximity of the stakes with relatively sharp blade edges, are provided with fully radiused blade edges, that is, an approximately semicircular cross-section, and a somewhat greater height than the other stakes except the relatively sharp blade edge stakes, in order to make effective use of the reduced force available.
  • FIG. 1 is a sectional view of a mandrel and pressure pad arrangement embodying the principles of this invention, including a sectional view of a folded bottom closure positioned over the end of the mandrel;
  • FIG. 2 is a plan view of the surface of a mandrel end embodying the principles of this invention
  • FIG. 3 is a plan view of the surface of a pressure pad embodying the principles of this invention.
  • FIGS. 4, 5 and 6 are fragmentary sectional views illustrating the special configurations of the various blade edges with which the pressure stakes are provided in the pressure pad of this invention.
  • FIG. 1 shows a container 10 positioned over the end 12 of mandrel 120 with pressure pad 11 above the sealed bottom closure 100 of container 10. Details of a complete container forming machine in which mandrel 120 and pressure pad 11 may be employed have been omitted, since a mandrel and pressure pad arrangement embodying the principles of this invention may be employed with various Ikinds of container forming equipment, including the t-ype exemplified by the C. Z. Monroe patent referred to above.
  • Mandrel 120 may be provided with a hollow interior 121 which is in communication with holes 126 in the end of mandrel 120 shown in FIG. 2, by means of which compressed air may be introduced in order to -release a container from the mandrel after the bottom closure has been sealed; it is to be understood, of course, that other techniques well known to those skilled in the art may be employed to release a container from the mandrel.
  • T-he end 12 of mandrel 120 has an exterior surface which is divided into a selected pattern of relieved and unrelieved areas, the sectional views of the surface of mandrel end 12 and pressure pad 11 being taken along section lines 1-1 in FIGS. 2 and 3.
  • pressure pad 11 which has a totally flat surface except for projecting pressure stakes 111a, 111b, 112a, 112b, 113:1, 113b, 114:1, 114b, 115a, 115b, 116a, 116b, 117a, 117b, so that whatever bulges are formed in the completed bottom closure by forcing pressure pad 11 against a bottom closure of a container positioned over mandrel end 12, are caused to appear in the interior of the container, and so that the outer surface of the container bottom is substantially at.
  • the alignment of pressure pad 11 and mandrel end 12 in FIG. 1 is obtained by positioning the upper portion of the pressure pad 11 shown in FIG. 3 over the lower portion of the mandrel 120 in FIG. 2 so that section lines 1-1 in the two drawings coincide.
  • the particular configuration of relieved and unrelieved areas in the exterior surface of mandrel end 12 depends, of course, on the shapes, thicknesses and patterns of the folded bottom closure panels which constitute the bottom closure structure of the container being assembled.
  • the bottom closure structure 100 illustrated in FIGS. 1, 2 and 3 is a version of the unique short bottom panel structure shown in the above-mentioned co-pending application filed on even date herewith.
  • the areas denoted A, B and C represent portions of the mandrel end 12 which have been relieved below the surface S by various amounts, the exact amounts depending upon the thickness of the paperboard stock and the number of overlapping layers or plies in the folded bottom closure.
  • the circular symbols 12S-1 through 125-4 in FIG. 2 represent a plurality of recessed areas of depth D to provide pressure relief at each of a corresponding plurality of points of high stress concentration.
  • Such points are typically located where interior paperboard panels are folded into multiple layers and come together at points in the interior of the container to press against a single paperboard layer which forms the exterior layer of the container bottom.
  • the depth D of recessed areas 12S-1 through 12S-4 may be on the order of 0.062 inch.
  • mandrel end 12 is shown in FIGS. 1 and 2 as a separate cap attached to mandrel 120 by Way of cap screws 122a and 12211, and dowels 123a and 123b, but it is to be understood that mandrel 120 may be constructed with mandrel end 12 integral with the remainder of mandrel 120. Openings 124a and 124b may be provided through the mandrel end, if desired, in order to allow for drainage of solvents or other solutions which have been applied to clean the container forming equipment.
  • Pressure pad 11 has a totally flat surface except for projecting pressure stakes 111a and 111b through 117a and 117b.
  • These stakes may be constructed from cylindrical shaft elements 31 each terminating in a blade or die-shaped cutting edge which is provided with a special configuration as explained below in connection with FIGS. 4, 5 and 6.
  • Each stake is located at a selected point in pressure pad 11 by positioning each cylindrical portion into an opening at a selected point in the pressure pad, where the shafts may be positioned by either a press fit, a keyway, or other well known technique. Selection of the points at which the stakes are located depends upon the location of potential leak paths in the bottom closure structure at which it is desired to apply increased pressure to compress the paperboard layers and thereby block the potential leak path.
  • pressure stakes are located in pairs along the edges of gusset portions and tuck-in and fold-over extensions of the various bottom panels, with the blade edge of each stake being positioned at right angles across the potential leak channel which is to be blocked.
  • each blade edge above the surface of pressure pad 11 depends upon the depth to which it is desired to penetrate the outer surface of the container bottom in order to compress the layers of paperboard which form the potential leak path.
  • a conventional blade edge 41 of rectangular section as shown in FIG. 4, is satisfactory.
  • Such a blade edge 43v is illustrated in FIG. 6, and in conjunction with the particular bottom structure 100 illustrated in FIGS. 1, 2 and 3, stakes 111a and 111b may be provided with this blade edge configuration.
  • FIG. 5 Another blade edge design is shown in FIG. 5, in which the blade edge 42 is fully radiused or rounded to have an approximately semicircular cross-section.
  • This blade edge may be employed where reduced force is available to penetrate to paperboard layers in the interior of the formed container bottom, such as may occur with stakes which are located in close proximity to stakes having the deep penetration design shown in FIG. 6.
  • stakes 112:1 and 112b in pressure pad 11 may be provided with blade edge configuration 42 where stakes 111a and 11111 are provided with blade edge structure 43.
  • the height of stakes 112a and 112b may be intermediate to the height of shallow penetration stakes with conventional rectangular blades 41 and the height of stakes with deep penetration blades 43.
  • pressure pad 11 may be provided with set screws 119 behind the stakes so that the heights of the stakes may be adjusted as desired.
  • pressure pad 11 may be provided with a conventional system of chambers 110 to accommodate a flow of cooling water to maintain pressure pad 11 at a desired temperature.
  • Mandrel and pressure pad apparatus for sealing together the bottom closure elements of a paperboard container and for forming a flattened outer surface on the container bottom closure sealed therebetween which comprises a mandrel cap for each of a plurality of corresponding mandrels, the exterior surface of each mandrel cap being divided into a predetermined configuration of areas selected ones of which are inwardly relieved to various depths to correspond to the configuration of multiple layer areas of various thicknesses of a predetermined container bottom closure structure in its folded position to receive in said inwardly relieved areas said multiple layer container bottom areas,
  • a pressure pad associated with each mandrel cap for cooperating with said mandrel cap to apply selected amounts of pressure to said bottom closure structure interposed between said mandrel cap and said pressure pad, said pressure pad being provided with a totally flat surface opposing said exterior surface of said mandrel cap, and a plurality of pairs of projecting pressure stakes located at selected points in said surface for applying increased pressure to corresponding pairs of points in said bottom closure structure.
  • each of said projecting pressure stakes is provided with a shaft element terminating at one end in a blade edge of predetermined configuration, said shaft elements being fitted into complementary recesses in the surface of said pressure pad so that said blade edge projects above the surface of said pressure pad by a predetermined amount.
  • apparatus for sealing together the bottom closure elements of a thermoplastic coated paperboard container and for forming a attened outer surface on ⁇ the container bottom closure formed therebetween which comprises,
  • a pressure pad associated with said mandrels and having a totally fiat surface which successively opposes the end of each of said mandrels as said mandrels rotate, for cooperating with said mandrels to seal together said folded bottom closure elements by applying selected amounts of pressure to said folded bottom closure elements between said mandrel end and said pressure pad, said pressure pad being provided with projecting pressure stakes at selected points in its surface to apply increased pressure at corresponding points in the bottom of said container in order to 7 8 block potential leak paths in the folded portions of References Cited said bottom closure, wherein the totally at surface UNITED STATES PATENTS of said pressure pad causes the exterlor surface of the sealed bottom of said container to be substantially 2,499,461 3/1950 Ch'rlstlansen 93-36-3 3,252,386 5/1966 Renners 93-44.1

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  • Making Paper Articles (AREA)
US599768A 1966-12-07 1966-12-07 Container fabricating apparatus Expired - Lifetime US3422730A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US59976866A 1966-12-07 1966-12-07

Publications (1)

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US3422730A true US3422730A (en) 1969-01-21

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Application Number Title Priority Date Filing Date
US599768A Expired - Lifetime US3422730A (en) 1966-12-07 1966-12-07 Container fabricating apparatus

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US (1) US3422730A (fr)
BE (1) BE707369A (fr)
DE (1) DE1611632A1 (fr)
DK (1) DK120372B (fr)
ES (1) ES348045A1 (fr)
FR (1) FR1563708A (fr)
GB (1) GB1185319A (fr)
NL (1) NL6716074A (fr)
SE (1) SE331226B (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3555975A (en) * 1968-03-04 1971-01-19 Bernard C Barnes Apparatus and method for automatically forming and sealing pliable containers
US3800682A (en) * 1970-09-08 1974-04-02 M Gournelle Apparatus for making containers of thermoplastic sheet material
US3912576A (en) * 1974-10-22 1975-10-14 Ex Cell O Corp Carton sealing apparatus
US3971300A (en) * 1975-04-25 1976-07-27 Nimco Corporation Apparatus for ultrasonic sealing of non-uniform folded carton bottom closure
US4279675A (en) * 1977-03-22 1981-07-21 Ex-Cell-O Corporation Method and apparatus for packaging
US4838847A (en) * 1987-03-04 1989-06-13 Shikoku Kakoki Co., Ltd. Packaging machine
EP0380252A1 (fr) * 1989-01-21 1990-08-01 Elopak Systems Ag Emballage
US5135463A (en) * 1991-03-11 1992-08-04 Champion International Corporation Bottom pressure pad for gable carton forming apparatus
US5762595A (en) * 1996-10-01 1998-06-09 Elopak Systems Ag Flat-sitting container bottom end closure and mechanism for forming same
US6260333B1 (en) 1999-10-19 2001-07-17 Sharon Manufacturing Co., Inc. Pressure pad for a container bottom sealing device
US6315705B1 (en) 1999-10-20 2001-11-13 International Paper Company Pressure pad having sculpted quadrantal regions
WO2006040010A1 (fr) * 2004-10-08 2006-04-20 Sig Technology Ag Dispositif permettant de comprimer au moins deux couches d'un fond plie d'un emballage multicouche et emballage multicouche
US20170313459A1 (en) * 2014-10-31 2017-11-02 Sig Technology Ag Device, In Particular for Closing a Head Region of a Foodstuffs Container Made of a Laminate Having an Edge Region Which is Skived and Partially Folded Over Itself

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499461A (en) * 1943-04-23 1950-03-07 Christiansen Christian Box sealing machine
US3252386A (en) * 1963-09-26 1966-05-24 Fmc Corp Apparatus for sealing end closures of cartons

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499461A (en) * 1943-04-23 1950-03-07 Christiansen Christian Box sealing machine
US3252386A (en) * 1963-09-26 1966-05-24 Fmc Corp Apparatus for sealing end closures of cartons

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3555975A (en) * 1968-03-04 1971-01-19 Bernard C Barnes Apparatus and method for automatically forming and sealing pliable containers
US3800682A (en) * 1970-09-08 1974-04-02 M Gournelle Apparatus for making containers of thermoplastic sheet material
US3912576A (en) * 1974-10-22 1975-10-14 Ex Cell O Corp Carton sealing apparatus
USRE29568E (en) * 1974-10-22 1978-03-07 Ex-Cell-O Corporation Carton sealing apparatus
US3971300A (en) * 1975-04-25 1976-07-27 Nimco Corporation Apparatus for ultrasonic sealing of non-uniform folded carton bottom closure
US4279675A (en) * 1977-03-22 1981-07-21 Ex-Cell-O Corporation Method and apparatus for packaging
US4838847A (en) * 1987-03-04 1989-06-13 Shikoku Kakoki Co., Ltd. Packaging machine
EP0380252A1 (fr) * 1989-01-21 1990-08-01 Elopak Systems Ag Emballage
US5135463A (en) * 1991-03-11 1992-08-04 Champion International Corporation Bottom pressure pad for gable carton forming apparatus
US5762595A (en) * 1996-10-01 1998-06-09 Elopak Systems Ag Flat-sitting container bottom end closure and mechanism for forming same
US6260333B1 (en) 1999-10-19 2001-07-17 Sharon Manufacturing Co., Inc. Pressure pad for a container bottom sealing device
US6315705B1 (en) 1999-10-20 2001-11-13 International Paper Company Pressure pad having sculpted quadrantal regions
WO2006040010A1 (fr) * 2004-10-08 2006-04-20 Sig Technology Ag Dispositif permettant de comprimer au moins deux couches d'un fond plie d'un emballage multicouche et emballage multicouche
US20170313459A1 (en) * 2014-10-31 2017-11-02 Sig Technology Ag Device, In Particular for Closing a Head Region of a Foodstuffs Container Made of a Laminate Having an Edge Region Which is Skived and Partially Folded Over Itself
US11001403B2 (en) * 2014-10-31 2021-05-11 Sig Technology Ag Device, in particular for closing a head region of a foodstuffs container made of a laminate having an edge region which is skived and partially folded over itself

Also Published As

Publication number Publication date
BE707369A (fr) 1968-05-30
FR1563708A (fr) 1969-04-18
SE331226B (fr) 1970-12-14
NL6716074A (fr) 1968-06-10
ES348045A1 (es) 1969-06-01
DE1611632A1 (de) 1971-01-21
GB1185319A (en) 1970-03-25
DK120372B (da) 1971-05-17

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