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GB2266266A - Heat sealing of carton blanks - Google Patents

Heat sealing of carton blanks Download PDF

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Publication number
GB2266266A
GB2266266A GB9208967A GB9208967A GB2266266A GB 2266266 A GB2266266 A GB 2266266A GB 9208967 A GB9208967 A GB 9208967A GB 9208967 A GB9208967 A GB 9208967A GB 2266266 A GB2266266 A GB 2266266A
Authority
GB
United Kingdom
Prior art keywords
nozzle
heater
band
carton
machine
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.)
Granted
Application number
GB9208967A
Other versions
GB9208967D0 (en
GB2266266B (en
Inventor
Richard Wolfgang Emil Mosse
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.)
Tetra Laval Holdings and Finance SA
Original Assignee
Tetra Laval Holdings and Finance SA
Tetra Alfa Holdings SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tetra Laval Holdings and Finance SA, Tetra Alfa Holdings SA filed Critical Tetra Laval Holdings and Finance SA
Priority to GB9208967A priority Critical patent/GB2266266B/en
Publication of GB9208967D0 publication Critical patent/GB9208967D0/en
Publication of GB2266266A publication Critical patent/GB2266266A/en
Application granted granted Critical
Publication of GB2266266B publication Critical patent/GB2266266B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • B29C65/103—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 direct heating both surfaces 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
    • B29C66/43122—Closing the top of gable top containers
    • 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
    • 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
    • B29C66/87—Auxiliary operations or devices
    • B29C66/874—Safety measures or devices
    • B29C66/8744—Preventing overheating of the parts to be joined, e.g. if the machine stops or slows down
    • B29C66/87445—Preventing overheating of the parts to be joined, e.g. if the machine stops or slows down by introducing protection shields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
    • B29K2711/12—Paper, e.g. cardboard
    • B29K2711/123—Coated
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Combustion & Propulsion (AREA)
  • Package Closures (AREA)

Abstract

A carton packing machine has a heater nozzle (10) with a band of gas outlet jets extending through the wall thereof from an interior hollow space therein and has a shield member (30) constituted by a chevron shaped plate projecting from said wall above said outlet jets. The shield member (30) protects part of a wall of a carton (210) from undesired heating during heat sealing. <IMAGE>

Description

HEAT SEALING OF CARTON BLANKS IN CONSTRUCTING OR CLOSING CARTONS The present invention relates to the heat sealing of carton blanks in the construction or closing of cartons and, in particular, to carton packing machines including means for joining portions of the carton to one another by heat sealing, using heater nozzles to direct a flow of hot air to effect sealing of such carton blanks.
Cartons for the packing of liquids such as milk, fruit juice and soft drinks, are usually produced from plastics coated paperboard or cardboard by heat sealing the plastics coating layers together to construct the carton and to close it.
Conventionally the heat sealing operation is carried out by warming the plastics coating layers of the carton material with jets of hot air to raise the plastics coating to a heat sealing temperature before pressing together portions of the carton to be joined.
Where it is necessary to heat the internal surfaces of the carton material at the carton mouth prior to closing the mouth of the carton, this is conventionally done by inserting into the carton mouth a heater nozzle which takes the form of closed-ended tube having a multitude of gas jet outlets arranged in a band transversely about its periphery through which heated air supplied into the nozzle escapes and is directed on to the walls of the carton at the carton mouth.
The exterior of the carton mouth is heated by a pair of similar nozzles positioned spaced from respective opposite sides of interior heating nozzle, with which they form a nozzle assembly.
We have now devised an opening arrangement for cartons of this type in which a pouring spout is provided by a portion of a front panel of the carton which portion can be pulled forward during opening of the carton to provide the pouring spout. The upper margin of the pouring spout is defined by the upper edge of a shortened front panel which upper margin is sealed externally when the carton is closed during packing but must remain unsealed internally if the user is to be able to pull out the spout once the external seal has been broken.
The need now therefore arises for increased precision in the location and area of the zone of internal sealing produced during closure of the top of a carton of this kind. In particular, we have found a need to prevent hot air directed at the outside of the upper part of the carton from spilling over into the interior and causing inappropriate heating.
We have found that it is possible to decrease the tendency of the sealed zone to encroach in an undesired direction due to the spill over described above by using a shield member associated with the heater nozzle.
The present invention now therefore provides a carton packing machine comprising means for joining portions of a carton to one another by heat-sealing, which means comprises a heater nozzle having at least one gas outlet jet for the supply of heated gas to warm a said carton portion to a sealing temperature by directing said heated gas on to said portion, which nozzle is provided with a shield member extending from the nozzle in the general direction of the gas flow from the said jet.
Preferably, said heater nozzle is for positioning alongside the mouth of a carton to be closed, and has a plurality of said gas jets arranged to be directed against the walls of the carton adjacent the carton mouth.
Preferably, said nozzle has a proximal gas inlet and a closed distal end and comprises nozzle walls enclosing a gas passageway and further comprises a multitude of said gas outlet jets extending from said gas passageway to the external surface of said walls. Said nozzle walls may include a pair of substantially planar walls which meet at an obtuse angle and comprise a band of said gas outlet jets extending from said gas passageway to the external surface of the said walls.
Said shield member preferably lies immediately adjacent said band and extends alongside a portion thereof. The shield member may lie between the said portion of the band and the inlet end of said nozzle.
Said band may preferably have a first portion of lesser width and second and third portions of greater width, said second and third portions lying at respective ends of said first portion and said shield member extending alongside said first portion between said second and third portions of said band.
The heat sealing machine may comprise a nozzle assembly which includes said heater nozzle as a first heater nozzle and further includes a second heater nozzle and a third heater nozzle. The first and third heater nozzles mey be disposed one on either side of said second heater nozzle such that a carton mouth may be positioned over said second heater nozzle and between said first and third heater nozzles so as to be heated on interior surfaces by said second heater nozzle and on oppositely directed exterior surfaces by said first and third heater nozzles.
In transverse cross-section, said second nozzle may have the form of a waisted quadrilateral and said first and third nozzles may be positioned opposite the faces of the second nozzle which contain said waist.
The said nozzle may have a multitude of gas outlet jets arranged in a band extending around approximately three quarters of the perimeter of said nozzle including that part thereof which is opposite to said third nozzle and those parts extending between said third nozzle and said first nozzle.
Said band of gas outlet jets on said second nozzle may be relatively wide opposite said third nozzle and on each of those parts extending between said third nozzle and said first nozzle may have a relatively wide portion nearest to said third nozzle and a relatively narrow portion extending therefrom towards said first nozzle.
Said relatively wide portions of said band in the part thereof extending between said third nozzle and said first nozzle are preferably somewhat shorter than or of approximately equal length to the relatively narrow portions, e.g. from 30 to 50 percent of the length of the narrow portions.
The gas outlets jets in said relatively narrow portions of said band may preferably be angled to extend in use toward the mouth of a container being closed in said machine, i.e.
angled away from the closed end of the nozzle.
The invention includes a hot air nozzle for a carton packing machine which has a proximal gas inlet and a closed distal end and comprises nozzle walls including a gas passageway and further comprises a multitude of gas outlet jets extending from said gas passageway to the external surface of at least one of said walls and a heat shield member extending from said nozzle in the general direction of gas flow from said jets. Preferred features of such nozzles are described above.
The invention also includes a nozzle assembly which includes a heater nozzle of the invention as described above as a first heater nozzle and further includes a second heater nozzle and a third heater nozzle, wherein said first and third heater nozzles are disposed one on either side of said second heater nozzle such that a carton mouth may be positioned over said second heater nozzle and between said first and third heater nozzles so as to be heated on interior surfaces by said second heater nozzle and on oppositely directed exterior surfaces by said first and third heater nozzles. Preferred features for such nozzle assemblies are described above.
The relatively narrow portion of the band of gas outlet jets adjacent to the shield member may be from 30 to 60 percent the width of the relatively wide portion of said band of jets. Those gas jets which are angled to extend toward the mouth of the carton during use may be arranged at an angle to the nozzle wall as it extends towards the distal end of the nozzle, measured in a plane perpendicular to the wall of the nozzle at the jet, of from 100 to 1600, more preferably 120 to 1500, e.g. 1350.
The use of angled gas outlet jets in heater nozzles for sealing the mouths of cartons is more fully described in British Patent Application No. 9106306.5 filed 25th March 1991.
The invention wi).l be further described and illustrated by the description of a preferred embodiment shown in the accompanying drawings in which: Figure 1 is a plan view of a heater nozzle assembly according to the invention; Figure 2 shows a blank for use in a carton packing machine according to the invention to form a carton having an easy opening arrangement; Figure 3a is a plan view of a heater nozzle according to the invention incorporating a shield member; Figure 3b is a front elevation of the nozzle of Figure 3a; Figure 4a is a plan view of a second heater nozzle for heating the exterior of a carton during sealing which is incorporated in the nozzle assembly of Figure 1; Figure 4b is a front elevation of the heater nozzle of Figure 4a;; Figure 5a is a plan view of the heater nozzle for heating the interior of a carton during sealing incorporated in the nozzle assembly of Figure 1; Figure 5b is a elevation of the side marked "B" of the heater nozzle of Figure 5a; Figure 5c is a side elevation showing the side marked "C" of the heater nozzle of Figure 5a; Figure 5d is a side elevation of the side marked "D" of the heater nozzle of Figure 5a; Figure 5e is a side elevation of the side marked "E" of the heater nozzle of Figure 5a; and Figure 6 shows in schematic longitudinal cross-section a portion of the heater nozzle of Figure 3a in use to heat the upper portion of a carton during the closing thereof.
As shown in Figure 1, a heater nozzle assembly according to the invention for use in a carton packing machine according to the invention comprises a first heater nozzle 10, a second heater nozzle 12 and a third heater nozzle 14. Each of these heater nozzles has an open proximal end and a closed distal end 16, 18 and 20 respectively. The heater nozzles are arranged with the first and third heater nozzles lying adjacent opposite respective sides of the second heater nozzle 12 with a gap therebetween so that the mouth of a carton may be fitted over the second heater nozzle 12 and wills of the carton will come to lie between the second heater nozzle 12 and the first and third heater nozzles 10 and 14.
The carton may be formed from a blank as shown in Figure 2 which is adapted to form an easily opened carton. The blank 210 comprises front, rear and opposed side body-forming panels 212, 214, 216 and 218, conventional bottom forming panels 220 and a conventional fifth panel 222 bordering upon rear panel 214. The blank further comprises a top forming front panel 224 having an upper sub-panel 226. It further comprises topforming rear and side panels 228, 230 and 232, each having a respective fin-forming upper sub panel 234, 236 and 238. The panels are demarcated by preformed crease lines. Additional preformed crease lines are provided for the folding of the top and the bottom of the carton. These include preformed crease lines 240 and 242 extending from the bottom corners of the top-forming front panel 224 to the centre of its upper edge where it borders the sub panel 226.
The sub panel 226 in the top-forming front panel 224 comprises a central region 244 and flanking regions 246 and 248. The height of the central region is substantially less than the height of the flanking regions. When the blank is folded in a conventional manner, a seal may be formed on the interior of the blank in the areas shaded in the drawings.
It will be noted that the shaded area does not include any part of the central region 244 of the sub panel 226. The exterior faces of the flanking regions 246 and 248 as well as their internal faces are sealed together and the external faces of the two halves of the central region 224 are sealed to one another. This external seal is easily broken by pulling apart the wing portions formed by the triangular areas of the top-forming panel 224 lyng below the sub panel 226.
The top-forming front panel can then easily be popped forward as a spout having a rim provided by the top edge of the central region 244 of the sub panel 226.
The first heater nozzle 10 of the assembly of Figure 1 is in use directed against top-forming front panel 224 of the carton. As shown in Figures 3a and 3b, the first heater nozzle 10 has a multitude of gas outlet jets 22 extending from its exterior periphery to its interior hollow space and arranged in a band running across two front faces thereof which meet at an angle of 1340 defining a shallow nose. The gas outlet jets run perpendicular to their respective faces.
The band of outlet jets 22 can be divided into three portions, namely a first central portion 24 and first and second outer portions 26, 28. Outer portions 26 and 28 are relatively wide and the central portion 24 is relatively narrow. Immzdiately above the central portion 24 is positioned a shield member 30 in the form of a chevron shaped plate projecting from the nose of the nozzle above the central portion 24 of the band of gas outlet jets.
The third nozzle 14 of the assembly of Figure 1 is generally similar in shape to the nozzle 10 but lacks the shield 30 and the band of the gas outlet jets 22 thereon is of constant width. The width of the band of nozzles is similar to that of the wider parts 26, 28 of the band on the nozzle 10. The second heater nozzle 12 of the assembly of the Figure 1 in plan takes the form of a waisted quadrilateral and has two opposite flat side faces and two opposite dished side faces. A band of gas outlet jets runs around the nozzle 12 adjacent its closed end 18. On the dished face 32 which faces the third heater nozzle 14 the band is relatively wide.The jets are directed at right angles to the face 32 with the exception of those jets lying on the corners between the face 32 and the adjacent side faces which are directed at about 450 outward to the side from the face 32.
On each of the two flat faces 34, 36, the band of jets has a first portion 38 of greater width and a second portion 40 of lesser width, the length of the portion 40 being slightly greater than that of the portion 38 and the width of the portion 40 being approximately one third of that of the portion 38. On the remaining face of the nozzle 12, no gas outlet jets are provided except at the corner junctions between that face and the faces 32, 36 where a relativel;T tpll column of gas outlet jets is provided which are directed at about 450 to the adjacent side faces 34, 36.
Those gas outlet jets in the relatively narrow portions 40 of the band on the side faces 34 and 36 are angled upwardly at about 450 away from the base 18 of the nozzle 12.
As shown in Figure 6, the effect of the shield 30 is to block hot air passing through the gas outlet jets in the region 24 of the band of jets in nozzle 10 from following the dotted path in Figure 6 to reach the interior surface of the carton along the upper free edge of the central region 244 of the top-forming front panel 224 where it is important that no heat seal is inadvertently obtained. Instead, gas flow is diverted downwardly over the exterior of the wall of the carton blank 210. This improves the reliability with which an easy opening carton of the kind formed from a blank shown in Figure 2 can be sealed satisfactorily with the spout forming portion free to pull forward as the carton is opened by tearing the external seal between the surrounding portions of the carton wall.
Many modifications and variations of the invention as described with reference to the drawings are possible within the scope of the invention.

Claims (27)

1. A carton packing machine comprising means for joining portions of a carton to one another by heat-sealing, which means comprises a heater nozzle having at least one gas outlet jet for the supply of heated gas to warm a said carton portion to a sealing temperature by directing said heated gas on to said portion, which nozzle is provided with a shield member extending from the nozzle in the general direction of gas flow from said jet.
2. A machine as claimed in Claim 2, wherein said heater nozzle is for positioning alongside the mouth of a carton to be closed, and has a plurality of said gas outlet jets arranged to be directed against the walls of the carton adjacent the carton mouth.
3. A machine as claimed in Claim 2, wherein said nozzle has a proximal gas inlet and a closed distal end and comprises nozzle walls enclosing a gas passageway and further comprises a multitude of said gas outlet jets extending from the said gas passageway to the external surface of said walls.
4. A machine as claimed in Claim 3, wherein said nozzle walls include a pai#r of substantially planar walls which meet at an obtuse angle and comprise a band of said gas outlet jets extending from said gas passageway to the external surface of said walls.
5. A machine as claimed in Claim 4, wherein said shield member lies immediately adjacent said band and extends alongside a portion thereof.
6. A machine as claimed in Claim 5, wherein said shield member lies between said portion of said band and the inlet end of said nozzle.
7. A machine as claimed in any one of Claims 4 to 6, wherein said band has a first portion of lesser width and second and third portions of greater width, said second and third portions lying at respective ends of said first portion and said shield member extending alongside first portion between said second and third portions of said band.
8. A machine as claimed in any preceding claim, comprising a nozzle assembly which includes said heater nozzle as a first heater nozzle and further includes a second heater nozzle and a third heater nozzle, wherein said first and third heater nozzles are disposed one on either side of said second heater nozzle such that a carton mouth may be positioned over said second heater nozzle and between said first and third heater nozzles so as to be heated on interior surfaces by said second heater nozzle and on oppositely directed exterior surfaces by said first and third heater nozzles.
9. A machine as claimed in Claim 8, wherein in transverse cross-section said second nozzle has the form of a waisted quadrilateral and said first and third nozzles are positioned opposite the faces of the second nozzle which contain said waist.
10. A machine as claimed in Claim 8 or ClaIm 9, wherein said second nozzle has a multitude of gas outlet jets arranged in a band extending around approximately three quarters of the perimeter of said nozzle including that part thereof which is opposite to said third nozzle and those parts extending between said third nozzle and said first nozzle.
11. A machine as claimed in Claim 10, wherein said band of gas outlet jets on said second nozzle is relatively wide opposite said third nozzle and on each of those parts extending between said third nozzle and said first nozzle has a relatively wide portion nearest to said third nozzle and a relatively narrow portion extending therefrom toward said first nozzle.
12. A machine as claimed in Claim 11, wherein said relatively wide portions of said band in the part thereof extending between said third nozzle and said first nozzle are somewhat shorter than or of approximately equal length to the relatively narrow portions.
13. A machine as claimed in Claim 11 or Claim 12, wherein the gas outlet jets in said relatively narrow portions of said band are angled to extend away from the distal end of said nozzle and therefore in use toward the mouth of a container being closed in said machine.
14. A carton packing machine substantially as hereinbefore described with reference to and as illustrated in Figures 1 to 6 of the accompanying drawings.
15. A hot air nozzle for a carton packing machine which has a proximal gas inlet and a closed distal end and comprises nozzle walls enclosing a gas passageway and further comprises a multitude of gas outlet jets extending from the said gas passageway to the external surface of at least one of said walls and a heat shield member extending from said nozzle in the general direction of gas flow from said jets.
16. A nozzle as claimed in Claim 15, wherein sald nozzle walls include a pair of substantially planar walls which meet at an obtuse angle and comprise a band of said gas outlet jets extending from said gas passageway to the external surface of said walls.
17. A nozzle as claimed in Claim 16, wherein said shield member lies immediately adjacent said band and extends alongside a portion thereof.
18. A nozzle as claimed in Claim 17, wherein said shield member lies between said portion of said band and the inlet end of said nozzle.
19. A nozzle as claimed in any one of Claims 16 to 18, wherein said band has a first portion of lesser width and second and third portions of greater width, said second portions lying at respective ends of said first portion and said shield member extending alongside said first portion between said second and third portions of said band.
20. A nozzle assembly which includes a heater nozzle claimed in any one of Claims 16 to 19 as a first heater nozzle and further includes a second heater nozzle and a third heater nozzle, wherein said first and third heater nozzles are disposed one on either side of said second heater nozzle such that a carton mouth may be positioned over said second heater nozzle and between said first and third heater nozzles so as to be heated on interior surfaces by said second heater nozzle and on oppositely directed exterior surfaces by said first and third heater nozzles.
21. A nozzle assembly as claimed in Claim 20, wherein in transverse cross-section said second nozzle has the form of a waisted quadrilateral and said first and third nozzles are positioned opposite the faces of the second nozzle which contain said waist.
22. A nozzle assembly as claimed in Claim 20 or Claim 21, wherein said second nozzle has a multitude of gas ouw t jets arranged in a band extending around approximatzly thiee quarters of the perimeter of said nozzle including that part thereof which is opposite to said third nozzle and those parts extending between said third nozzle and said first nozzle.
23. A nozzle assembly as clalmed in Claim 22, wherein said band of gas outlet jets on said second nozzle is relatively wide opposite said third nozzle and on each of those parts extending between said third nozzle and said first nozzle has a relatively wide portion nearest to said third nozzle and a relatively narrow portion extending therefrom toward said first nozzle.
24. A nozzle assembly as claimed in Claim 23, wherein said relatively wide portions of said band in the part thereof extending between said third nozzle and said first nozzle are somewhat shorter than or of approximately equal length to the relatively narrow portions.
25. A nozzle as claimed in Claim 23 or Claim 24, wherein the gas outlet jets in said relatively narrow portions of said band are angled to extend in use toward the mouth of a container being closed in said machine.
26. A nozzle substantially as hereinbefore described with reference to and as illustrated in Figures 3a and 3b of the accompanying drawings.
27. A nozzle assembly substantially as hereinbefore described with reference to and as illustrated in Figures 1 to 6 of the accompanying drawings.
GB9208967A 1992-04-24 1992-04-24 Heat sealing of carton blanks in constructing or closing cartons Expired - Fee Related GB2266266B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9208967A GB2266266B (en) 1992-04-24 1992-04-24 Heat sealing of carton blanks in constructing or closing cartons

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9208967A GB2266266B (en) 1992-04-24 1992-04-24 Heat sealing of carton blanks in constructing or closing cartons

Publications (3)

Publication Number Publication Date
GB9208967D0 GB9208967D0 (en) 1992-06-10
GB2266266A true GB2266266A (en) 1993-10-27
GB2266266B GB2266266B (en) 1996-01-17

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GB9208967A Expired - Fee Related GB2266266B (en) 1992-04-24 1992-04-24 Heat sealing of carton blanks in constructing or closing cartons

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GB (1) GB2266266B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0805748A4 (en) * 1994-10-04 1999-02-03 Tetra Laval Holdings & Finance SEAL FOR THE LOWER PART OF A CARTON

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1042415A (en) * 1964-05-11 1966-09-14 Basf Ag Apparatus for continuous heat sealing of plastics sheeting
GB1190233A (en) * 1966-06-21 1970-04-29 Grace W R & Co Method and Apparatus for Sealing Wrapper Flaps
GB1195578A (en) * 1966-09-28 1970-06-17 Tetra Pak Ag A method of producing a Tube from a Web and apparatus for performing the same
GB1238373A (en) * 1968-05-06 1971-07-07
GB1375471A (en) * 1971-07-09 1974-11-27

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1042415A (en) * 1964-05-11 1966-09-14 Basf Ag Apparatus for continuous heat sealing of plastics sheeting
GB1190233A (en) * 1966-06-21 1970-04-29 Grace W R & Co Method and Apparatus for Sealing Wrapper Flaps
GB1195578A (en) * 1966-09-28 1970-06-17 Tetra Pak Ag A method of producing a Tube from a Web and apparatus for performing the same
GB1238373A (en) * 1968-05-06 1971-07-07
GB1375471A (en) * 1971-07-09 1974-11-27

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0805748A4 (en) * 1994-10-04 1999-02-03 Tetra Laval Holdings & Finance SEAL FOR THE LOWER PART OF A CARTON

Also Published As

Publication number Publication date
GB9208967D0 (en) 1992-06-10
GB2266266B (en) 1996-01-17

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