GB2315456A - Apparatus and method for sealing flutes - Google Patents

Apparatus and method for sealing flutes Download PDF

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Publication number
GB2315456A
GB2315456A GB9615187A GB9615187A GB2315456A GB 2315456 A GB2315456 A GB 2315456A GB 9615187 A GB9615187 A GB 9615187A GB 9615187 A GB9615187 A GB 9615187A GB 2315456 A GB2315456 A GB 2315456A
Authority
GB
United Kingdom
Prior art keywords
sealing
parts
seal
flute
flutes
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
GB9615187A
Other versions
GB9615187D0 (en
GB2315456B (en
Inventor
Clive Peter Haines
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.)
David S Smith Packaging Ltd
Original Assignee
David S Smith Packaging Ltd
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 David S Smith Packaging Ltd filed Critical David S Smith Packaging Ltd
Priority to GB9615187A priority Critical patent/GB2315456B/en
Publication of GB9615187D0 publication Critical patent/GB9615187D0/en
Publication of GB2315456A publication Critical patent/GB2315456A/en
Application granted granted Critical
Publication of GB2315456B publication Critical patent/GB2315456B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/0044—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for shaping edges or extremities
    • 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
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/745—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool
    • 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
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/137—Beaded-edge joints or bead seals
    • 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
    • B29C66/80—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
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81422—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being convex
    • 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
    • B29C65/06—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using friction, e.g. spin welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • 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
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2024/00—Articles with hollow walls
    • B29L2024/006—Articles with hollow walls multi-channelled

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

Apparatus 1 for providing a seal in a flute of a fluted softenable material 2, comprises element 3 to force opposite surfaces of the material 2 towards one another such that friction softens the material sufficiently to collapse the flute and effect sealing. The forcing element 3 may comprise two substantially parallel elongate sealing parts 4, 4 a each having substantially arcuate tips 8. Sealing part 4 may extend beyond the part 4 a during sealing. Sealing part 4 may be provided with a cutting edge or blade to improve cutting where this is required. The sealing process may be assisted by providing the force element 3 with a heating element.

Description

APPARATUS AND METHOD FOR SEALING FLUTES The invention relates to apparatus and a method for sealing flutes in an extruded plastics material.
Extruded plastics materials are used in a wide variety of applications due to their strength, and ease and cheapness of formation. These materials generally comprise a fluted structure, having two thin sheets spaced apart by substantially parallel webs, which form a series of longitudinally extending flutes in the material, which are usually open ended. The material is often referred to as corrugated plastic.
In some applications of this material, it is desirable for the ends of the flutes to be sealed off, to prevent ingress of dirt and other extraneous matter. This is especially so in the packaging industry when the material may be used for example for forming containers such as boxes, and inserts for containers. The material is creased and cut to enable it to be folded to a desired pattern, both the folds and cuts sometimes being required to be sealed.
Previous methods for accomplishing this have included stopping up the ends of open flutes with for example foam material. Another known method is to heat up the knife used for cutting the material, to try to melt the plastic at the cut edge. Stopping up the flutes with foam is difficult, and requires the provision of additional apparatus. Heating the cutting knife does not result in a satisfactory product, because quite often the seal formed is thin and easily broken by physical stresses imposed on the material in use. Neither method is suitable for forming sealed creases, and both require additional energy input for the injecting or heating procedures.
The present invention seeks to mitigate problems such as these.
According to the invention there is provided apparatus for providing a seal in a flute of a fluted material, comprising means to force opposite surfaces of the material towards one another such'that friction softens the material sufficiently to collapse the flute and effect sealing.
This arrangement allows the formation of a durable seal without the need for additional materials such as foam, or additional energy input.
It is preferred that the forcing means comprises at least two sealing parts, and that the parts are deployed such that one part extends beyond the end of the other part, towards the material to be sealed.
It is further preferred that each sealing part comprises a tip section having a substantially arcuate or rounded profile to enhance creation of frictional effects, and it is further preferred that the parts are disposed in substantially parallel, side by side relation, such that a gap is formed between the tips. This aids formation of the seal, by providing a place into which the material can flow.
The apparatus and the parts may be adapted such that the parts can be deployed separately or substantially simultaneously.
The tip of the furthest extending part may be provided with a cutting edge, to enhance cutting when this is desired.
It is preferred that the positions of the parts relative to one another can be varied, both vertically and horizontally or substantially so, so that the apparatus can perform with different grades of material.
Where one or more additional sealing part is employed, it is preferably disposed adjacent the other sealing parts to assist in sealing.
There may be additional heating means to aid the frictional forces in sealing.
The apparatus may be adapted such that the sealing parts operate with a linear motion as would be used for example in a flat bed process.
Alternatively, the apparatus may be adapted such that the sealing parts operate with a rotary motion.
According to a second aspect of the invention there is provided a method of forming a seal in a flute of a fluted material, comprising the step of applying means to the material to force opposite surfaces of the material towards one another such that friction softens the material sufficiently to collapse the flute and effect sealing.
The parts may be deployed simultaneously, and may be heated during and/or before the operation.
Apparatus embodying the invention will further be described by way of example with reference to the accompanying drawings, in which: Fig. 1 is a schematic representation of apparatus embodying the invention in use; Fig. 2 is an illustration of alternative profiles for a part of the apparatus of Fig.
1; and Fig. 3 is a schematic representation of an alternative embodiment of the invention.
Thus, referring to the drawings, there is illustrated apparatus 1 for providing a seal in a flute of a fluted material 2, comprising means 3 to force opposite surfaces 5, 6 of the material 2 towards one another such that friction softens the material sufficiently to collapse the flute and effect sealing.
Referring to Fig.1, the apparatus 1 is shown forming a seal in a sheet of material. As illustrated, the forcing means 3 comprises two substantially parallel elongate sealing parts 4, 4a, having substantially arcuate tips 8, and being controlled by control means (not shown) of the apparatus 1 which regulates the extent of its movement. The part 4 extends beyond the part 4a towards the material 2 when the parts contact the material. To accomplish this, for example where the parts are moved linearly to form the seal, the part 4 is moved further than the part 4a a desired amount by the control means. Alternatively, when the parts 4, 4a are in fixed relation, both parts are moved the same distance, but the part 4 is positioned in advance of the part 4a. An anvil surface (not shown) may be used underneath the lower surface 6 to support the material 2.
The sealing process may be assisted if the forcing means 3 is heated, for example by an electrical heating element, but this is not a requirement.
It will be appreciated that the configuration of either sealing part can be varied to suit different grades of material, and, for example to produce different effects or patterns in the material. Referring to Fig. 2, for example the part 4 may be provided with a cutting edge or blade to improve cutting where this is required.
The apparatus may also be provided with suitable control systems, (not shown) in order to effect adjustment of the positions of the parts 4, 4a relative to one another. Thus, in some applications it may be more convenient to have the sealing parts 4, 4a together, side by side, and in others it may be preferable to have a space between them. In addition, the amount which one sealing part 4 extends past the end of the adjacent sealing part 4a can be varied. It is preferred that the parts 4, 4a are removable from the apparatus easily, to be replaced in case of damage or wear.
The apparatus can be operated in such a way that the seal is performed by a linear movement of the parts 4, 4a. Thus, sheets of material could be moved under the apparatus and a cut performed. Alternatively, the apparatus itself could be controlled to move over a stationary sheet of material by appropriate control means, such as computer control means, in order to seal a desired shape in the material. Alternatively, the apparatus could be adapted for rotation of the parts 4, 4a to form the seal.
In an alternative embodiment, the parts 4, 4a comprise the edges of two discs, one having a smaller diameter than the other, and which are mounted together for rotation at their centres. The apparatus would then be rolled across the material, in much the same way as a pizza cutter to form the seal.
In a further alternative embodiment, an additional sealing part 9 (Fig. 3) can be provided to assist in the sealing process. This part is advantageously placed closely adjacent the sealing part 4a and can be positioned to stop short of the sealing part 4a, the three parts in combination thus forming three "steps".
In use, the apparatus illustrated in the drawings is brought into proximity with a sheet of material, such as an extruded, fluted, plastics material such as is sold under the Trade Mark "CORREX", and the parts 4, 4a are brought into contact with the material, either substantially simultaneously, or with a slight delay. The tips 8 of the parts 4, 4a contact the upper surface 5 of the material 2, pressing it down towards the opposite surface 6 without piercing it. The material thus slides over the end arcuate surfaces of the tips 8, firstly of part 4 and then part 4a, and frictional forces build up. These frictional forces cause the material in the area of the tips 8 to become softened, to flow into the gap 10 between the tips 8, fusing the surfaces 5, 6 together and sealing the flutes.
When the apparatus 1 is used to form a sealed cut, the shorter part 4a is positioned on the product side of the cut.
Any suitable material can be used for the sealing parts 4, 4a, 9, such as for example, steel or brass. The choice of material will be influenced by the adiabatic thermal properties required, which should ideally be balanced with "wear" properties of the parts. For example, brass is softer than steel and so may wear out faster.
Using the method and apparatus of the invention, it is possible to form a durable seal in one process step without the need for additional material or equipment.
The seal which is formed utilises sufficient material and is made over a sufficiently wide area to render it secure.

Claims (16)

1. Apparatus for providing a seal in a flute of a fluted material, comprising means to force opposite surfaces of the material towards one another such that friction softens the material sufficiently to collapse the flutes and effect sealing.
2. Apparatus according to Claim 1, wherein the forcing means comprises at least two sealing parts.
3. Apparatus according to Claim 2, wherein the parts are deployed such that one part extends beyond the end of the other part, towards the material to be sealed.
4. Apparatus according to claim 1 or claim 2, wherein each sealing part comprises a tip section having a substantially arcuate or rounded profile to enhance creation of frictional effects.
5. Apparatus according to any of Claims 2 to 4, wherein the parts are disposed in substantially parallel, side by side relation, such that a gap is formed between the tips.
6. Apparatus according to any preceding claim, adapted such that the parts can be deployed separately or substantially simultaneously.
7. Apparatus according to any of Claims 2 to 6, wherein the tip of the furthest extending part is provided with a cutting edge.
8. Apparatus according to any of claims 2 to 7, wherein the positions of the parts relative to one another can be varied.
9. Apparatus according to any of claims 2 to 8, comprising at least one further sealing part.
10. Apparatus according to any preceding claim, further comprising heating means.
11. Apparatus according to any preceding claim, wherein the sealing parts are adapted to operate with a linear motion.
12. Apparatus according to any preceding claim, wherein the sealing parts are adapted to operate with a rotary motion.
13. Apparatus substantially as hereinbefore described with reference to the accompanying drawings.
14. A method of forming a seal in a flute of a fluted material, comprising the step of applying means to the material to force opposite surfaces of the material towards one another such that friction softens the material sufficiently to collapse the flutes and effect sealing.
15. A method according to Claim 14, wherein the parts are deployed simultaneously.
16. A method according to Claim 14 or Claim 15, wherein a sealing part is heated before and/or during sealing.
GB9615187A 1996-07-19 1996-07-19 Apparatus and method for sealing flutes Expired - Fee Related GB2315456B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9615187A GB2315456B (en) 1996-07-19 1996-07-19 Apparatus and method for sealing flutes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9615187A GB2315456B (en) 1996-07-19 1996-07-19 Apparatus and method for sealing flutes

Publications (3)

Publication Number Publication Date
GB9615187D0 GB9615187D0 (en) 1996-09-04
GB2315456A true GB2315456A (en) 1998-02-04
GB2315456B GB2315456B (en) 2000-04-05

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GB9615187A Expired - Fee Related GB2315456B (en) 1996-07-19 1996-07-19 Apparatus and method for sealing flutes

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4515648A (en) * 1981-12-28 1985-05-07 Rohm Gmbh Method of making a gastight multiple-walled plastic panel
US5384002A (en) * 1991-10-15 1995-01-24 William C. Heller, Jr. Fluted plasticboard sealing apparatus
AU2059495A (en) * 1994-06-08 1995-12-14 Corex Plastics (Australia) Pty Ltd Improved machine for modifying twin-walled sheet
WO1996016791A1 (en) * 1994-12-02 1996-06-06 Shannon B.V. Method for introducing sealing edges into panels of thermoplastic material, and an assembly therefor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5183672A (en) * 1991-04-16 1993-02-02 Gary W. Fetterhoff Apparatus for forming at least one fold line pattern in a rigid plastic material
GB9213265D0 (en) * 1992-06-23 1992-08-05 Fra Mo Snc Sheet perforation
DE4221180A1 (en) * 1992-07-01 1994-01-05 Stribel Gmbh Method and device for producing optical elements

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4515648A (en) * 1981-12-28 1985-05-07 Rohm Gmbh Method of making a gastight multiple-walled plastic panel
US5384002A (en) * 1991-10-15 1995-01-24 William C. Heller, Jr. Fluted plasticboard sealing apparatus
AU2059495A (en) * 1994-06-08 1995-12-14 Corex Plastics (Australia) Pty Ltd Improved machine for modifying twin-walled sheet
WO1996016791A1 (en) * 1994-12-02 1996-06-06 Shannon B.V. Method for introducing sealing edges into panels of thermoplastic material, and an assembly therefor

Also Published As

Publication number Publication date
GB9615187D0 (en) 1996-09-04
GB2315456B (en) 2000-04-05

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Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20020719