US3462916A - Apparatus for heat sealing cartons - Google Patents

Apparatus for heat sealing cartons Download PDF

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Publication number
US3462916A
US3462916A US565972A US3462916DA US3462916A US 3462916 A US3462916 A US 3462916A US 565972 A US565972 A US 565972A US 3462916D A US3462916D A US 3462916DA US 3462916 A US3462916 A US 3462916A
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United States
Prior art keywords
carton
heat
nozzle bar
flaps
bar means
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US565972A
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English (en)
Inventor
Arthur H T Chin
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Fibreboard Corp
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Fibreboard Corp
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    • 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
    • B65B51/20—Applying or generating heat or pressure or combinations thereof by fluid pressure acting directly on folds or on opposed surfaces, e.g. using hot-air jets
    • 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
    • B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
    • 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
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72327—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of natural products or their composites, not provided for in B29C66/72321 - B29C66/72324
    • B29C66/72328—Paper
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8169—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps the mounting of said pressing elements being laterally movable, e.g. adjustable
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83421—Roller, cylinder or drum types; Band or belt types; Ball types band or belt types
    • B29C66/83423—Roller, cylinder or drum types; Band or belt types; Ball types band or belt types cooperating bands or belts

Definitions

  • the packaging of butter, ice cream and like perishables generally requires a mechanical lock, conventional glues or a carton overwrap to assure carton integrity and to prevent spoilage of the product retained therein.
  • the application of heat to the cartons flaps to effect sealed end closures gives rise to a number of problems which are not totally solved by conventional apparatus and methods.
  • such apparatus and methods are generally arranged to conduct or otherwise convey a substantial amount of heat whereby the packaged product becomes contaminated or otherwise damaged.
  • certain adhesive materials may be damaged or lost due to such high heat concentrations.
  • the carton oftentimes becomes scorched or otherwise defaced due to a high heat concentration at portions thereof.
  • a tight end closure is not always effected to assure a high degree of structural integrity to the carton for shipping and like purposes.
  • the instant invention provides an apparatus and method adapted to overcome such difliculties and particularly adapted for the packaging of perishables, such as ice cream and butter by using hot air for carton sealing purposes. Attention is drawn to United States Patent No. 3,248,843 and United States patent application Ser. No. 457,893, both assigned to the assignee of this application, which disclose apparatus and methods particularly adapted to employ air maintained at substantially high temperatures and volumes to heat seal adhesively treated carton flaps.
  • This invention is capable of utilizing heated air at a substantially low volume and temperature thus requiring less power input to the heating means employed to heat the air.
  • the nozzle bar employed to subject the carton flaps to hot air is further adapted to conduct heat directly to the carton flaps.
  • the heat may be thus concentrated at selected areas of the carton flaps to increase sealing rates, also eliminate scorching or other types of defacing of paperboard surfaces and prevent damage to the adhesive utilized.
  • carton end closures may be sealed rapidly, heat losses are minimized and little, if any, heat is transferred to the product contained in the carton.
  • An object of this invention is to provide an apparatus and method whereby a low volume of heated air may be utilized to effect an eificient carton seal expeditiously and economically without transferring appreciable amounts of heat to the cartons contents or causing carton defacing.
  • Another object of this invention is to provide an elongated and narrow nozzle bar means in a heat sealing apparatus arranged to efficiently and rapidly seal adhesively treated carton portions together.
  • a further object of this invention is to provide an apparatus for heat sealing carton flaps comprising a nozzle bar and flap control bar means adapted to be arranged for sealing various carton flap arrangements.
  • FIG. 1 is a view with parts broken away illustrating an apparatus embodying novel aspects of this invention as it would appear during a carton sealing operation;
  • FIG. 2 is an end elevational view of a heat sealing means employed in the apparatus illustrated in FIG. 1;
  • FIG. 3 is a side elevational view of the heat sealing means illustrated in FIG. 2 with portions thereof broken away for clarification purposes;
  • FIG. 4 is a cross sectional view taken in the direction of arrows 4-4 in FIG. 2;
  • FIG. 5 is a view taken in the direction of arrows 5-5 in FIG. 1 with parts broken away for clarification purposes;
  • FIG. 6 is a view taken in the direction of arrows 6-6 in FIG. 1 with parts broken away for clarification purposes;
  • FIG. 7 is a view illustrating an attachment for a flap hold-down bar employed in the apparatus of FIG. 1;
  • FIG. 8 is another embodiment of a heat sealing means of this invention.
  • FIG. 9 illustrates typical carton end flaps which may be sealed pursuant to the teachings of this invention.
  • the apparatus embodying novel aspects of this invention comprises a conveyor means 20 having spaced lugs 21 attached to continuous chains thereof.
  • the conveyor means is arranged for moving a conventional carton C along a linear path P in the direction of the illustrated arrow.
  • conveyor speeds of from 30 to f.p.m. have been successfully employed.
  • the carton may comprise adhesively treated major flaps F and F and minor flaps F and F
  • the term adhesive as used herein should be understood to mean any pie-applied fuseable coating adapted to be activated by heat for sealing paperboard or like panels together.
  • such adhesive may constitute a heat scalable wax, polyethylene, polyvinyl chloride or the like.
  • the carton may constitute paperboard or other suitable packaging material either partially or totally coated with such an adhesive.
  • the flaps are suitably arranged to be folded into position by conventional flap folding means (not shown), preferably mounted in a stationary manner in the apparatus.
  • a stationary hold-down bar means 22 is arranged over the carton to urge it downwardly, as more clearly illustrated in FIG. 6.
  • the lower, slanted surface of the hold-down bar is preferably arranged to make only a line contact with the carton to prevent undue scuffing thereof.
  • a flap control bar means 23 is arranged to position and hold flap F substantially in a fixed plane during such carton movement.
  • a tapered surface 23a of the flap control bar is preferably arranged within an angle A of from 5 to 20 relative to a vertically disposed plane to "correctly position flap F
  • surface 23a can be arranged in a tapered manner so as to gradually close flap F when it moves through the heat sealing means.
  • the hereinafter explained nozzle bar means could be likewise modified in a tapered manner to facilitate a gradual closing of the carton flaps.
  • the flap control bar is associated with adjusting means (FIG. 7) comprising spaced extensions 23b and 23b, secured thereto to selectively vary angle A.
  • the adjusting means preferably located at each end of the flap control bar, are identical and thus identical numerals accompany like elements.
  • the numerals depicting elements included in the assembled adjusting means located leftwardly in FIG. 7 are accompanied by a prime symbol however.
  • Extension 23b has an aperture suitably formed therein and arranged to receive pin 230 which mounts trunnion 23d.
  • the trunnion preferably comprises a threaded post 23a arranged to extend through an aperture formed in a stationary bar 23 and secured thereto by a nut 23
  • Adjustment screws 23g and 2311 are suitably threaded in bar 24 to permit rotation of flap control bar 23 about the axis of pin 23c and thus adjustment of angle A.
  • angle A FIG. 6
  • screws 23/1 and 23h would be extended a predetermined amount and screws 23g and 23g retracted a like amount. It should be noted that the ends of such screws are preferably rounded and merely abut flat outer surface portions of extensions 23b and 23b.
  • L-shaped braces 25 and 26 are secured to the stationary bed of the machine.
  • Bar 24, supporting adjustable flap control bar 23, is preferably secured to brace 25 by a bolt 27.
  • the braces are further arranged to support carton hold-down bar 22 by means of suitably arranged attachment means 28 and 29.
  • a heat sealing means 30 is attached to the machine to heat seal flaps F and F together as will be hereinafter more fully explained.
  • the heat sealing means comprises a housing 31 attached to the bed of the machine by an inverted L- shaped plate member 32 (FIG.
  • the housing preferably constitutes a metallic constituent, such as aluminum or bronze, constructed to conduct heat particularly through the nozzle portion thereof.
  • One or more bolt and spacer arrangements 32a may be arranged to threadably secure a side wall of housing 31 to member 32 in the manner shown.
  • an adjusting means comprising a bolt 32b, preferably arranged at each end of member 32, secures a horizontally disposed portion of member 32 to a plate 33, detachably secured to the bed of the machine.
  • the adjusting means further comprises screws 32c and 32d, threadably secured to such portion and arranged to selectively vary an angle B between such verti cally disposed plane and a vertically disposed axis of housing 31 (FIG. 5) for purposes hereinafter explained.
  • a spherically shaped washer 322 is preferably arranged between the head of bolt 32b and member 32 to facilitate such adjustment. For example, if it is desired to lessen angle B, screws 32c and 32c (FIG. 1) would be extended and screws 32d and 32d would be retracted from member 32. As above mentioned, it is preferred to employ an adjusting means at each end of member 32 for stabilization purposes. However, in certain machine applications a single adjusting means could be employed. Corresponding elements of the second adjustment means (illustrated in assembled form) are depicted by like numerals accompanied by a prime symbol Referring now more particularly to the construction and arrangement of housing 31 of the heat sealing means illustrated in FIGS.
  • a closure plate 31a is detachably secured to the bottom thereof to enclose a preheating chamber 31b.
  • the air is communicated to chamber 31b via conduit 31c and is thereafter permitted to flow through an elongated opening 31d.
  • the air is preheated due to contact with internal heated surface portions of metallic housing 31.
  • a conventional pump 34 rated at 2-15 c.f.m. of air and set at 2-10 p.s.i., for example, may be utilized to supply the incoming air via conduit 310 (FIG. 5).
  • Elongated opening 31d communicates with a plurality of slots 31e forming fins therebetween, radially arranged about a removable and cylindrically shaped heating means or cartridge heater 31
  • Heater 31 has been removed from housing 31 in FIGS. 2-4 for clarification purposes.
  • a Chromolox C 505 heater rated at 1100 watts and 240 V. AC. and also a heater rated at 525 watts and V. AC. have been used successfully.
  • the slots are further arranged to communicate with a nozzle bar means comprising a plurality of radially eX- tending and drilled passages 31g arranged intermediate tapered first and second side surface portions thereof and may be arranged within an angle C selected from a range of from 0 to 20 (preferably 5 to 15).
  • the thickness of the nozzle bar means may be varied along the length thereof to effect a gradual losing of the carton flaps if so desired for certain carton sealing applications.
  • Such passages are further arranged to communicate the air heated by heater 31 to drilled orifices 31h formed in such surface portions and arranged in substantial parallel relationship to a top surface portion of the nozzle bar means whereat the side surface portions terminate.
  • the orifices are preferably arranged to impart the heated air directly to opposed surface portions of adhesively treated flaps F and F (FIG. 6).
  • a conventional heat sensing means 311' such as a Fenwal 17202-0 thermoswitch or thermostat, is preferably attached to housing 31 to have the temperature of the heated air conducted thereto via narrowed portions of the housing to constantly control such temperature preferably within a range of from to 600 F.
  • a conventional control means 35 schematically illustrated in FIG. 5, may be utilized for automatically controlling the heat output of heating means 31
  • the tapered first and second portions of the nozzle bar means are preferably arranged to abut the portions of the carton flaps to be sealed (illustrated in spaced relationship in FIG. 6') during passage of the carton through the heat sealing means.
  • Such an arrangement permits the heating efiects caused by the air discharged via orifices 3111 to be supplemented by the heat conducted to the sealed flap portions through the metallic nozzle bar means.
  • the fins arranged to form slots 31e are constructed and arranged to heat and maintain the nozzle bar means at a temperature which is substantially the same as the temperature of the air emitted from nozzles 3171.
  • the flaps may be held in close proximity to each other to effect a rapid seal due to this atrangement which permits heat, at a substantially constant temperature, to be concentrated at the carton portions to be sealed.
  • the low pressure air further functions as a lubricant to prevent sloughing-olf of the pre-applied adhesive.
  • conveyor 20 continues to move the carton past compression means 36 (FIG. 1), preferably in the form of an endless belt, to rapidly effect a tight seal, i.e., no elaborate sealing or cooling means need be employed to seal the carton due to the low sealing temperature employed.
  • compression means 36 preferably in the form of an endless belt
  • Two such belts are preferably employed to slightly compress the carton therebetween to effect such sealing.
  • Such compression means could also comprise suitably arranged compression bars or the like. It should be noted that constructions and arrangements substantially identical to those described above are also employed in parallel relationship on the opposite side of the machine to thus simultaneously effect an end closure at each end of the carton. Such compact arrangements differ from conventional ones wherein rather lengthy sealing means for effecting carton end closures are positioned in series.
  • FIG. 8 illustrates a modified form of the heat sealing means. Like numerals, accompanied by a prime symbol depict corresponding structures included in the first described heat sealing means embodiment.
  • a closure plate 31a is arranged to enclose a preheating chamber 31b. Elongated opening or slot 31d communicates with radially extending slots 312' and passages 31g which in turn communcate air to orifices 31h.
  • Heater 31f is arranged to have a portion thereof directly heat the air passing through passages 31d.
  • the following method is preferably employed to secure opposed carton portions together (in this instance flap F to F as illustrated in FIG. 1.
  • Conveyor 20 is arranged for moving carton C along linear path P during which movement control bar 23 is arranged for positioning and holding flap F in substantially the same plane during movement through heat sealing means 30.
  • the apparatus is further arranged for holding flaps F and F in close proximity to each other on each side of the nozzle bar means. Heated air at a low pressure, preferably from 1 to p.s.i., is discharged from orifices 31h and imparted directly onto selected portions of the adhesively coated flaps F and F As above mentioned, although the flaps are illustrated as being slightly spaced from the nozzle bar means in FIG.
  • the nozzle bar means may be utilized to perform a two-fold heat transferring function, i.e., discharging heated air via orifices 31h and conducting heat therethrough to the flaps.
  • Compression means 36 are arranged for compressing the flaps together to form carton end closures.
  • a temperature setting of from 400 to 480 F. for heater 31f was found to efliciently heat the air utilized for the sealing of a carton coated with polyethylene.
  • conveyor means was set at 82 feet per minute to convey approximately 70 cartons per minute through the heat sealing means.
  • Eflicient seals were obtained when the conveyor speeds were varied within a range of from 46 feet per minute to 117 feet per minute with the temperature setting being maintained within a range of from 440 to 480 F.
  • the air supply utilized was rated at approximately 6 cubic feet of free air per minute and maintained at approximately 2 to 3 p.s.i.
  • An apparatus for sealing opposed adhesively treated flaps of a carton together comprising conveyor means for moving said carton along a linear path, control bar means arranged in substantial parallel relationship to said linear path and having a surface formed thereon for positioning and holding one of said flaps during carton movement by said conveyor means and a heat sealing means comprising a housing having an elongated and narrow metallic nozzle bar means arranged thereon in substantial parallel relationship to said linear path, said nozzle bar means having first and second fiat surface portions terminating at an edge thereof, said first surface portion positioned in close juxtaposed relationship to said control bar means to have said one flap maintained in substantial contact with said first surface portion and the surface of said control bar means, said nozzle bar means further comprising a plurality of orifices formed in at least the first surface portion thereof and passage means formed therein for communicating heated air to said orifices and heating means operatively associated with said nozzle bar means for conducting heat through metallic portions thereof and for heating air communicated through said passage means whereby the adhesive on said one flap contacting the first flat surface portion of said nozzle
  • the invention of claim 1 further comprising holddown bar means arranged over and in juxtaposed relationship to said nozzle bar means for urging said carton towards said nozzle bar means, said nozzle bar means further arranged to extend substantially vertically upwardly towards said hold-down bar means.
  • said housing comprises a chamber formed therein
  • said heating means comprises a removable heating means inserted into said chamber and arranged to heat air in said chamber and to conduct heat to said nozzle bar means, said chamber further arranged to communicate with said passage means.
  • an apparatus comprising heat sealing means for heat sealing opposed, adhesively treated portions of carton flaps together, a housing having a chamber formed therein, a nozzle bar means having a plurality of apertures formed therein for discharging heated air therethrough, heating means arranged in said chamber, a plurality of fins constructed and arranged in said chamber to substantially surround and contact said heating means and a plurality of slots formed between said fins and arranged to communicate air to said apertures after said air has been heated by said heating means and means for applying pressure to said flaps to seal them together.
  • said housing including said fins, is further constructed and arranged to conduct heat from said heating means to said nozzle bar means to heat and maintain the nozzle bar means at a temperature which is substantially the same as the temperature of the air discharged from said apertures.
  • an apparatus comprising a heat sealing means adapted to heat seal opposed, adhesively treated portions of carton flaps together
  • the invention comprising an elongated and narrow metallic nozzle bar means having at least one surface formed thereon, a plurality of apertures formed in said surface and passage means formed in said nozzle bar means arranged to communicate heated air to said apertures, a flap control bar closely juxtaposed and parallel to the surface of said nozzle bar means to hold one of the carton flaps in substantial contact with said surface and heating means operatively assocated with said nozzle bar means for simultaneously conducting heat therethrough and for heating air in the passage means thereof whereby said one carton flap is subjected to a combination of heat conducted through said nozzle bar means and heated air communicated through said apertures.
  • the invention of claim 12 further comprising adjusting means for moving said flap control bar to selectively vary the inclination thereof relative to the surface of said nozzle bar means.
  • the invention of claim 12 further comprising holddown bar means arranged in juxtaposed relationship to said nozzle bar means for urging said carton towards said nozzle bar means.
  • the invention of claim 15 further comprising adjusting means arranged for moving said nozzle bar means in a vertically disposed plane.
  • said adjusting means is further arranged for moving said nozzle bar means to selectively vary the angle between said vertically disposed plane and a vertically disposed axis of said nozzle bar means.
  • said nozzle bar means comprises first and second fiat surfaces arranged to taper towards each other and wherein the included angle therebetween is sealed from a range of from 5" to 19.
  • a plurality of said apertures are formed in each of said first and second flat surfaces.
  • thermoforming means further comprises a housing and said heating means is removably mounted therein.
  • An apparatus for heat sealing opposed adhesively treated portions of carton flaps together comprising a housing having a chamber formed therein, a metallic nozzle bar means having at least one flat and substantially uninterrupted surface and a plurality of apertures formed therein communicating with said chamber for discharging heated air therethrough, heating means in said chamber and associated with said nozzle bar means to conduct heat through metallic portions thereof such that said adhesively treated portions of said carton are heated by a combination of said heated air and heat conducted through the metallic portions of said nozzle bar means and means for applying pressure to said flaps to seal them together.
  • Apparatus according to claim 21 wherein said apparatus further comprises a plurality of fins constructed and arranged in said chamber to substantially surround and contact said heating means, and a plurality of slots formed between said fins and arranged to communicate air to said apertures after said air has been heated by said heating means.
  • Apparatus according to claim 22 wherein said housing and said fins are further constructed and arranged to conduct heat from said heating means to said nozzle bar means to heat and maintain the nozzle bar means at a temperature which is substantially the same as the temperature of the air discharged from said apertures.
  • nozzle bar means is elongated and has first and second flat and substantially uninterrupted surfaces terminating at a top edge of said nozzle bar means, said plurality of apertures being formed in both said first and second surfaces, said apertures communicating with said chamber by passage means formed in said nozzle bar means.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Package Closures (AREA)
  • Making Paper Articles (AREA)
US565972A 1966-07-18 1966-07-18 Apparatus for heat sealing cartons Expired - Lifetime US3462916A (en)

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US56597266A 1966-07-18 1966-07-18

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BE (1) BE699593A (mo)
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597900A (en) * 1969-07-28 1971-08-10 Mead Corp Machine for bonding together a pair of thermoplastic coated panels
US3754456A (en) * 1971-05-27 1973-08-28 Reynolds Metals Co Blank constructions for hermetically sealed cartons and methods of forming same
US3777448A (en) * 1972-08-01 1973-12-11 Georgia Pacific Corp Nd apparatus for heat-sealing paperboard package closure flaps
US3921371A (en) * 1974-04-03 1975-11-25 Richard G Lee Carton sealing machine
US20030041963A1 (en) * 2001-08-20 2003-03-06 Lie-Zhong Gong Reactivatable adhesives
US20150033676A1 (en) * 2009-08-04 2015-02-05 Coating Excellence Int Llc Method and apparatus for bag closure and sealing
WO2015028475A1 (de) * 2013-08-26 2015-03-05 Lemo Maschinenbau Gmbh Schweissvorrichtung für differierende schweisslagen und schweissverfahren

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1306021A (mo) * 1971-02-12 1973-02-07
DE3606204A1 (de) * 1985-04-10 1986-10-16 Windmöller & Hölscher, 4540 Lengerich Vorrichtung zum fortlaufenden verschweissen von mehrlagigen folienbahnen
CN112407461A (zh) * 2020-11-27 2021-02-26 邢台职业技术学院 一种高效节能的包装自动封口设备及其使用方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3248843A (en) * 1963-01-14 1966-05-03 Fibreboard Paper Products Corp Apparatus and method for sealing cartons
US3249024A (en) * 1961-11-08 1966-05-03 Machinery Dev Corp Method and apparatus for assembling cartons
US3336464A (en) * 1965-02-25 1967-08-15 Kliklok Corp Device for heating compressed air, particularly for heat bonding purposes in folding box machines
US3340777A (en) * 1965-02-25 1967-09-12 Kliklok Corp Machines for bonding, by heat and pressure, panels of paperboard having a thermoplastic coating thereon

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US3249024A (en) * 1961-11-08 1966-05-03 Machinery Dev Corp Method and apparatus for assembling cartons
US3248843A (en) * 1963-01-14 1966-05-03 Fibreboard Paper Products Corp Apparatus and method for sealing cartons
US3336464A (en) * 1965-02-25 1967-08-15 Kliklok Corp Device for heating compressed air, particularly for heat bonding purposes in folding box machines
US3340777A (en) * 1965-02-25 1967-09-12 Kliklok Corp Machines for bonding, by heat and pressure, panels of paperboard having a thermoplastic coating thereon

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597900A (en) * 1969-07-28 1971-08-10 Mead Corp Machine for bonding together a pair of thermoplastic coated panels
US3754456A (en) * 1971-05-27 1973-08-28 Reynolds Metals Co Blank constructions for hermetically sealed cartons and methods of forming same
US3777448A (en) * 1972-08-01 1973-12-11 Georgia Pacific Corp Nd apparatus for heat-sealing paperboard package closure flaps
US3921371A (en) * 1974-04-03 1975-11-25 Richard G Lee Carton sealing machine
US20030041963A1 (en) * 2001-08-20 2003-03-06 Lie-Zhong Gong Reactivatable adhesives
US20150033676A1 (en) * 2009-08-04 2015-02-05 Coating Excellence Int Llc Method and apparatus for bag closure and sealing
US9809335B2 (en) * 2009-08-04 2017-11-07 Coating Excellence International Llc Method for bag closure and sealing
WO2015028475A1 (de) * 2013-08-26 2015-03-05 Lemo Maschinenbau Gmbh Schweissvorrichtung für differierende schweisslagen und schweissverfahren
DE102014216990B4 (de) 2013-08-26 2022-02-10 Lemo Maschinenbau Gmbh Verfahren und Vorrichtung zum Schweißen differierender Schweißlagen eines Produktes

Also Published As

Publication number Publication date
DE1611622B1 (de) 1972-10-12
BE699593A (mo) 1967-11-16
SE354625B (mo) 1973-03-19
NL6707264A (mo) 1968-01-19
GB1144757A (en) 1969-03-12

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