EP1813530A1 - Vorrichtung zum Formen einer Verpackung - Google Patents

Vorrichtung zum Formen einer Verpackung Download PDF

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Publication number
EP1813530A1
EP1813530A1 EP06101120A EP06101120A EP1813530A1 EP 1813530 A1 EP1813530 A1 EP 1813530A1 EP 06101120 A EP06101120 A EP 06101120A EP 06101120 A EP06101120 A EP 06101120A EP 1813530 A1 EP1813530 A1 EP 1813530A1
Authority
EP
European Patent Office
Prior art keywords
inner part
fill tube
packaging
former set
outer layer
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.)
Withdrawn
Application number
EP06101120A
Other languages
English (en)
French (fr)
Inventor
Cornelis Johannes Jacobus Veuger
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.)
Breedewegh BV
Original Assignee
Breedewegh BV
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 Breedewegh BV filed Critical Breedewegh BV
Priority to EP06101120A priority Critical patent/EP1813530A1/de
Publication of EP1813530A1 publication Critical patent/EP1813530A1/de
Withdrawn legal-status Critical Current

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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
    • B65B65/00—Details peculiar to packaging machines and not otherwise provided for; Arrangements of such details
    • B65B65/06—Details peculiar to packaging machines and not otherwise provided for; Arrangements of such details coated or treated with anti-friction or anti-sticking materials, e.g. polytetrafluoroethylene
    • 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
    • B65B39/00—Nozzles, funnels or guides for introducing articles or materials into containers or wrappers
    • B65B39/007—Guides or funnels for introducing articles into containers or wrappers
    • 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
    • B65B39/00—Nozzles, funnels or guides for introducing articles or materials into containers or wrappers
    • B65B39/04—Nozzles, funnels or guides for introducing articles or materials into containers or wrappers having air-escape, or air-withdrawal, passages
    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/22—Forming shoulders; Tube formers

Definitions

  • the present invention relates to fill tubes of the type used for packaging purposes, in particular to former sets for use in vertical form, fill and seal machines.
  • Packaging machines are known in which a product, such as a foodstuff, is sealed within one or more webs of polymeric material to form a package.
  • Such packages may take different forms such as bags, sachets, tubes, envelopes, boxes, capsules and the like.
  • the package may be evacuated or may be provided with a particular gas filling to preserve freshness.
  • One manner of making such packages is to use a former set.
  • the former set comprises a forming collar, which guides the web into a tubular shape around a fill tube. On the fill tube, a longitudinal seal is applied to form a closed tubular web.
  • the tubular web is continuously withdrawn from one end of the fill tube as portions of product are fed into the other end of the fill tube.
  • the filled tubular web leaving the lower end of the fill tube is sealed and severed, usually by an appropriate heat seal bar, to form individual packages.
  • the fill tube and forming collar are supported by a suspension frame.
  • Prior art former sets have generally used stainless steel fill tubes.
  • Food standard regulations impose strict limitations on the materials that may come into contact with foodstuffs. Furthermore, depending on the product being packaged, the interior of the fill tube is exposed to considerable wear. Frozen foods are particularly abrasive in this respect.
  • the suspension frame and forming collar have also generally been made of steel in order to comply with food regulations and in order to ensure sufficient strength. Steel is also desirable for the purpose of cleaning. Certain food standards require the use of particularly effective cleaning agents that are highly corrosive. It is however a considerable disadvantage of steel that the whole construction is extremely heavy.
  • Aluminium fill tubes are lightweight but are subject to corrosion by cleaning detergents. Furthermore, when used for wet products, the interior of the tube can be eroded by cathodic sacrifice due to electrolytic effects.
  • Forming collars have been made of non-metallic materials such as fibre reinforced epoxy but this is not suitable for the fill tube itself.
  • a particular problem with the use of plastics materials in this context is the presence of static electrical charge. Due to the constant movement of the packaging web over the forming collar and fill tube, static charge can build up. This is undesirable as it can cause powdery products and dust to be retained.
  • Another requirement of the exterior surface of the fill tube and forming collar is that of low friction. Many plastic surfaces offer relatively high frictional resistance to polymeric packaging materials.
  • An additional problem is apparent in the case that the fill tube or packaging web is wet. In this case, surface tension effects can cause the packaging web to adhere to the outside of the fill tube, preventing smooth processing.
  • a packaging former set having a fill tube comprising an elongate tubular body having an upper end, a lower end and a bore, the body comprising an inner part and an outer part or layer, the inner part being formed of a first, relatively hard material, the outer part being formed of a second, polymeric material having a friction reducing outer surface.
  • the inner and outer parts are intimately connected together preferably around their entire periphery.
  • each material can be optimized to meet the requirements of the environment to which the part is exposed.
  • the inner layer may be chosen to have the requisite hardness for withstanding abrasion by the products being packaged and should also meet the relevant food standard quality.
  • the materials of both inner and outer parts are preferably of food standard quality, meaning that they are authorized for entering into contact with food products.
  • the outer part may be chosen for its ability to provide a friction reducing outer surface, either directly or indirectly by its ability to be coated with other materials. By reducing friction, static effects may also be reduced. In general, it will also be of food standard quality. Both materials will preferably be chosen for their resistance to corrosion or damage, in particular by exposure to the product being packaged and to detergents of the type employed for cleaning.
  • the inner part is provided with a peripheral groove on an outer surface adjacent to at least its lower end and the outer part terminates at and is engaged in the groove.
  • the fill tube must be extremely resistant to damage that may typically occur during use and cleaning.
  • the edges of the outer part must not be exposed to shock which could cause them to be raised and subject to further damage or become susceptible to contamination. By recessing the edge of the outer part in a groove in the inner part, such exposure is largely precluded. While the use of a groove of a limited axial extent is preferred, it is noted that the outer part may be embedded into the inner part over substantially the whole surface should this be desired.
  • the outer surface of the outer part comprises a pattern or relief. It has been found that surface roughnesses of between 10 and 200 microns are ideal, depending upon the packaging materials used. Preferably a value of around 100 microns is favoured.
  • One preferred manner of achieving such roughness is by including micro particles or microspheres in the material of the outer part.
  • the micro particles may be any suitable inert material such as silicon, ceramics, glass or metal.
  • the friction reducing outer surface may comprise a friction reducing material such as polytetrafluoroethylene (PTFE) or wolfram disulfide.
  • the combination of a friction reducing material over an outer part having a surface relief produces an enhanced effect allowing ease of transport of the packaging web material over the fill tube.
  • the friction reducing material may be applied both to the outer part and also to any other exposed surfaces such as edge regions of the inner part.
  • the outer surface should be generally hydrophobic in order to reduce surface tension effects that could cause the packaging material to stick.
  • Wolfram disulfide and friction reducing materials that may be applied at temperatures below the melting temperature of the outer part have been found highly effective in this context.
  • the outer part has a thickness of between 0.2 mm and 2 mm, most preferably about 0.5 mm.
  • such material thicknesses for the outer part are sufficient to achieve the desired effects while being sufficiently stable to mechanical stresses and easy to apply using coating techniques. It is however also understood that greater thicknesses could be used e.g. using coextrusion techniques to form the inner and outer parts.
  • a longitudinal groove is formed in or through the outer part over substantially a lower half of its length.
  • a removable seal plate may be embedded into the fill tube. The seal plate acts to provide counter pressure for the longitudinal seal assembly of a vertical fill/seal machine. Since this part is exposed to wear, its periodic replacement is desirable.
  • a gas flushing channel is provided leading from a gas inlet nozzle situated towards the upper end of the body to a gas outlet adjacent the lower end of the body.
  • the gas flushing channel may be used for packaging products under a particular atmosphere. Air may thereby be evacuated from the package prior to sealing and replaced or supplemented by e.g. nitrogen or another suitably inert or bacteriostatic gas.
  • the bore of the fill tube should be "smooth".
  • the gas flushing channel may preferably be recessed e.g. into a wall of the inner part.
  • the bore is located eccentrically with respect to the inner part such that the wall has a varying thickness
  • the gas flushing channel may then be formed within a thickened section of the wall.
  • the gas flush channel is formed as a groove in the outer surface of the inner part that can be subsequently covered e.g. by the seal plate.
  • the inner part may comprise any suitable food quality material of adequate hardness and durability.
  • exemplary materials include stainless steel, aluminium and their alloys.
  • the inner part comprises polyvinylidene fluoride (PVDF).
  • PVDF polyvinylidene fluoride
  • a particular advantage of this material is its ease of manufacture as it can be readily machined to form the above-mentioned circumferential groove and gas flush channel. It also has short term resistance to heat up to temperatures of 270 °C and long term resistance up to around 180-190 °C. This is useful in allowing the outer part to be bonded thereto without adversely affecting the structure of the inner part.
  • the outer part comprises a mouldable polymeric material, preferably having a melting point of less than 200 °C.
  • Polyamide has been found most suitable for this purpose and has shown itself to be exemplary in forming a good bond with the underlying inner part.
  • the combination of polyamide and PVDF has been found exceptionally effective.
  • polymeric coatings have been used for providing non-stick coatings to objects.
  • Such non-stick polymeric materials of which PTFE is exemplary, characteristically have high melting points and require coating at temperatures above 400 °C using sintering techniques. Such materials are not suitable for application using moulding or spray moulding techniques.
  • a packaging former set comprising a fill tube as described above together with a forming collar surrounding and spaced from the fill tube for guiding a generally flat web of packaging material into concentric engagement with the fill tube.
  • the packaging former set may further comprise a suspension frame for supporting the fill tube and forming collar within a packaging machine and for maintaining the desired spacing.
  • both the suspension frame and the forming collar substantially comprise polymeric materials.
  • the former set has the advantage of considerably lower weight compared to existing metal former sets.
  • substantially comprise polymeric materials is intended to mean that the main structural components are polymeric. It is understood that minor components and fixation elements such as bolts or the like may nevertheless be formed of metal.
  • the packaging former set may further comprise an attachment, preferably a bayonet mount, by which further accessories such as a bag spreader or converter box, mounted on a mounting ring may be attached to the fill tube.
  • an attachment preferably a bayonet mount, by which further accessories such as a bag spreader or converter box, mounted on a mounting ring may be attached to the fill tube.
  • a method of manufacturing a fill tube for a packaging former set comprising providing an elongate cylindrical inner part of a relatively hard material of food standard quality the inner part having an internal bore, applying an outer layer of a polymeric material on an outer surface of the inner part and providing a friction reducing outer surface to the outer layer.
  • the outer layer is provided by heating the inner part and coating with the polymeric material in a molten state at a temperature of around 200 °C.
  • Polyamide has been found most suitable for application using such spray moulding techniques.
  • the material of the outer layer is thus melted into engagement with the inner part without causing distortion thereof.
  • the outer layer contracts on cooling to cause it to be pretensioned into intimate engagement with the inner part.
  • the method further comprises forming a groove in the outer surface of the inner part adjacent to an end thereof, prior to applying the outer layer.
  • the groove may be formed by machining although it is also possible to use appropriate moulding techniques.
  • the method comprises applying a mask to the outer surface of the inner part prior to applying the outer layer and subsequently removing the mask to expose areas of the inner part where no outer layer is required.
  • a longitudinal groove may be formed in this way through the outer layer for receiving a seal plate.
  • any exposed edges of the outer layer may be thermo-fixed to bond them to the inner part. This may be performed by application of local heat and optionally pressure to such edges, in particular along the joint with a seal plate.
  • the local heat is applied at around the melting temperature of the polymeric material, for polyamide, around 190 °C.
  • the friction reducing outer surface is provided by applying a surface roughness to the outer layer.
  • a surface roughness is achieved by the inclusion of micro- particles or micro-spheres in the material of the outer layer.
  • the micro particles may be any suitable inert material such as silicon, ceramics, glass or metal and may be included in the polymeric material prior to hot-coating it onto the inner part.
  • friction reducing properties may be improved by applying a low friction finish over the outer layer.
  • a most suitable finish is wolfram disulfide in particular Dicronite DL5TM. Thermo fixing of the outer layer after coating with wolfram sulfide has been found effective in improving the retention of the wolfram sulfide.
  • the invention also relates to a packaging machine comprising a fill tube or a former set as described above.
  • the packaging machine is operable to feed a web of polymeric material over the forming collar and into circumferential relation with the fill tube.
  • the packaging machine is further operable to supply a product to the bore of the fill tube and to seal the web around the product to form a closed package.
  • Figure 1 shows a perspective view of a former set according to the present invention
  • Figure 2 shows a cross-sectional view through the former set taking along line 2-2 of Figure 1;
  • Figure 3 shows a perspective view of the fill tube of Figure 1, viewed from the lower end;
  • Figure 4 shows a perspective view of the lower end of the fill tube of Figure 3.
  • Figure 5 shows a longitudinal cross-section through the seal bar of Figure 4 along line 5-5 .
  • FIG. 1 there is shown a perspective view of a former set 1 for a vertical fill/seal packaging machine according to one aspect of the present invention.
  • the former set 1 comprises a fill tube 2 comprising an elongate generally cylindrical body 3.
  • a forming collar 4 is provided around the fill tube 2 and both the fill tube 2 and the forming collar 4 are held in spaced concentric relation by a suspension frame 6.
  • the suspension frame 6 also serves to support the former set 1 within a packaging machine (not shown).
  • An elongate seal plate 10 is provided on the exterior of the fill tube 2, extending to a lower end 12 thereof.
  • Towards an upper end 14 of the fill tube 2 there is provided a gas nozzle 16.
  • the fill tube 2 has a friction reducing outer surface 26.
  • Figure 2 shows a cross-section through the fill tube 2 of Figure 1, taken along line 2-2 .
  • the fill tube 2 comprises a relatively thick inner part 18, a relatively thin outer part 20 and a friction reducing outer surface 26.
  • the fill tube 2 also comprises a bore 22, which extends from the upper end 14 to the lower end 12.
  • the bore 22 is arranged eccentrically with respect to the inner part 18.
  • a gas flushing channel 24 extends longitudinally through the thickest region of the wall 23.
  • the gas flushing channel 24 extends from the gas nozzle 16, to an outlet 25 ( Figure 3) in the bore 22 adjacent to the lower end 12.
  • an annular gap 32 formed between an outer surface of the fill tube 2 and the forming collar 4.
  • the inner part 18 of the fill tube 2 is made out of PVDF.
  • the outer part 20 comprises polyamide. Other materials may also be used, to the extent that they meet food hygiene standards. In particular, stainless steel and aluminium may be used for the inner part 18 and their combination with an outer part 20 formed of polyamide is considered to be extremely advantageous especially for hard and abrasive products such as frozen foods.
  • the fill tube has an outer diameter of about 16 cm and a length of about 90 cm.
  • the bore diameter is about 14.5 cm and the thickness of the wall 23 varies from about 0.5 cm to 1 cm in the region of the gas flushing channel 24. It will be immediately evident that other dimensions may also be used according to the packaging requirements. Typical dimensions may range from 4 to 25 cm in outer diameter and 60 to 150 cm in length.
  • the forming collar 4 is formed of fibre reinforced epoxy material, coated with a non-stick wolfram disulfide coating. It is understood that other materials may be used including stainless steel and aluminum.
  • the suspension frame 6 is also manufactured from polymeric materials. Nevertheless, other conventionally used materials can be used, at least for certain component parts thereof.
  • Figure 3 shows a perspective view of the fill tube 2 of Figure 1 with the seal bar removed, viewed from the lower end 12.
  • a mounting flange 34 can be seen at the upper end 14 for attachment of the tube 2 to the frame 6.
  • Figure 3 also shows the manner in which the gas flushing channel 24 is formed by machining a longitudinal groove 30 from the outside of the tube 2 and the outlet 25 into the bore 22.
  • the bore 22 is widened to form a socket 36. Studs 38 are located within the socket 36 to form a bayonet attachment for the mounting ring of a bag spreader (not shown).
  • Figure 4 shows a close up view of the lower end 12 of the fill tube 2.
  • the outer part 20 and inner part 18 are recessed together at this point to avoid undesired separation of or damage to the outer part 20.
  • a circumferential groove 28 is formed around the outside of the inner part 18, close to the lower end 12.
  • the groove 28 has a relatively abrupt lower edge 40 and tapers away towards the upper end 14 of the fill tube 2.
  • the outer part 20 lies intimately against the inner part 18 and terminates at the lower edge 40 of the groove 28. In this manner, the lower extremity of the outer part 20 is protected from damage.
  • Figure 4 also shows the extremity of the longitudinal groove 30.
  • the longitudinal groove 30 extends completely to the lower end 12 of the fill tube 2. It may however terminate at a distance from the lower end 12. It should also be noted that different grooves could be formed for respectively providing the gas flushing channel 24 and receiving the seal plate 10.
  • Figure 5 shows a partial longitudinal cross-section through the fill tube 2 taken along line 5-5 of Figure 4. In this view, the cross section of the circumferential groove 28 may be seen. Also visible in Figure 5 are the friction reducing outer surface 26, which covers both the outer part 20 and the exposed surfaces of the inner part 18 and the internal shape of the socket 36.
  • a web 8 of packaging material is fed over the forming collar 4 and drawn downwards through the annular gap 32 to wrap it around the fill tube 2.
  • the tubular web 9 is then sealed to itself to form a longitudinal seam by the application of heat and pressure against the seal plate 10 using an appropriate sealing device.
  • product to be packaged may be supplied to the bore 22.
  • the tubular web 9 may then be sealed closed by cross seals and severed at preset intervals to form individually sealed packages of product.
  • a certain type of gas such as nitrogen.
  • the gas may be supplied via the gas nozzle 16 and gas flushing channel 24 to the interior of the tubular web as it leaves the lower end 12 of the fill tube 2, prior to forming the cross seal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
EP06101120A 2006-01-31 2006-01-31 Vorrichtung zum Formen einer Verpackung Withdrawn EP1813530A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06101120A EP1813530A1 (de) 2006-01-31 2006-01-31 Vorrichtung zum Formen einer Verpackung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06101120A EP1813530A1 (de) 2006-01-31 2006-01-31 Vorrichtung zum Formen einer Verpackung

Publications (1)

Publication Number Publication Date
EP1813530A1 true EP1813530A1 (de) 2007-08-01

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Family Applications (1)

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EP06101120A Withdrawn EP1813530A1 (de) 2006-01-31 2006-01-31 Vorrichtung zum Formen einer Verpackung

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EP (1) EP1813530A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202000005068A1 (it) * 2020-03-10 2021-09-10 Gimsa S R L Assieme formatore per macchine confezionatrici

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH373683A (de) * 1962-11-12 1963-11-30 Sig Schweiz Industrieges Vorrichtung zum Abfüllen von sperrigem schüttbarem Gut
DE10027581A1 (de) * 2000-06-02 2001-12-13 Hastamat Verpackungstechnik Gm Schlauchbeutelmaschine zur Herstellung von Beuteln mit Kantensiegelung
JP2002002619A (ja) * 2000-06-26 2002-01-09 Mitsubishi Gas Chem Co Inc 粉粒体包装体の製造方法及び製造装置
US20030084650A1 (en) * 2001-10-08 2003-05-08 Gerhard Kuss Bagging machine to manufacture seal edged bags

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH373683A (de) * 1962-11-12 1963-11-30 Sig Schweiz Industrieges Vorrichtung zum Abfüllen von sperrigem schüttbarem Gut
DE10027581A1 (de) * 2000-06-02 2001-12-13 Hastamat Verpackungstechnik Gm Schlauchbeutelmaschine zur Herstellung von Beuteln mit Kantensiegelung
JP2002002619A (ja) * 2000-06-26 2002-01-09 Mitsubishi Gas Chem Co Inc 粉粒体包装体の製造方法及び製造装置
US20030084650A1 (en) * 2001-10-08 2003-05-08 Gerhard Kuss Bagging machine to manufacture seal edged bags

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 05 3 May 2002 (2002-05-03) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202000005068A1 (it) * 2020-03-10 2021-09-10 Gimsa S R L Assieme formatore per macchine confezionatrici

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