WO1999059416A1 - Boyau emballe et fronce de film tubulaire pour emballage d'aliments et son procede de fabrication - Google Patents

Boyau emballe et fronce de film tubulaire pour emballage d'aliments et son procede de fabrication Download PDF

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Publication number
WO1999059416A1
WO1999059416A1 PCT/EP1999/003182 EP9903182W WO9959416A1 WO 1999059416 A1 WO1999059416 A1 WO 1999059416A1 EP 9903182 W EP9903182 W EP 9903182W WO 9959416 A1 WO9959416 A1 WO 9959416A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubing
shirred stick
heat
shirred
stick
Prior art date
Application number
PCT/EP1999/003182
Other languages
English (en)
Inventor
Yannick Perrot
Original Assignee
Cryovac, Inc.
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 Cryovac, Inc. filed Critical Cryovac, Inc.
Priority to AU41406/99A priority Critical patent/AU4140699A/en
Publication of WO1999059416A1 publication Critical patent/WO1999059416A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A22—BUTCHERING; MEAT TREATMENT; PROCESSING POULTRY OR FISH
    • A22C—PROCESSING MEAT, POULTRY, OR FISH
    • A22C13/00—Sausage casings
    • A22C13/02—Shirring of sausage casings
    • A22C13/023—Holders or packs of shirred casings

Definitions

  • the present invention relates to a wrapped shirred stick of a tubular film and to a method of making it More particularly the invention relates to a shirred stick of a tubular film wrapped into a tubing of a thermoplastic material which is closed at both ends and is shrunk only at one of the two ends It also relates to a method of making said wrapped shirred stick by closing one end of a tubing of a heat- shrinkable thermoplastic material, shrinking part of said tubing comprising the closed end, introducing the shirred stick therein and then closing the other end of the wrapping tubing to enclose the shirred stick
  • tubular film Depending on the size (diameter) of the tubular film, they are generally classified as small size tubings (e g up to about 7 cm in diameter), intermediate size tubings (from about 7 cm to about 17 cm in diameter) and large size tubings (from about 17 cm to about 30 cm in diameter) They are typically employed for the packaging of pumpable products (e g processable meat emulsions, or meat slurries, processed and comminuted meat, cheese, and the like flowable products)
  • pumpable products e g processable meat emulsions, or meat slurries, processed and comminuted meat, cheese, and the like flowable products
  • Structural integrity of the shirred sticks is also essential as any structural irregularity may cause breakage, jamming, or malfunctioning with consequent shut-down and loss of production time on the stuffing machine
  • Typical lengths of the shirred sticks are up to about 60 cm, preferably up to 50 cm and more preferably up to 40 cm
  • a shirred stick of 40 cm may comprise 50-60 m or even more of tubular film, depending on the diameter of the tubular film and on the shirring method employed
  • a general suitable method will involve the following steps • supplying a metered length of tubing to a mandrel of suitable diameter
  • the larger sticks are provided with a tubular core, typically a tube of plastic material inserted into the bore of the stick immediately after shirring Deshir ⁇ ng is then prevented by a pin or a peg extending transversely through the walls of the plastic core at both extremities, thus restraining the stick end-wise
  • GB-A-1 ,526,782 describes the use of a tubular envelope closed at one end by sealing, fed with the shirred stick and closed by gathering and winding the other end with adhesive or wired tape This method has the inherent disadvantage that as soon as the packing material is removed to load the stick to the stuffing horn, the stick will tend to deshirr
  • US-A-3,528,825 describes a method of packing a shirred stick by loading it into a tubing of a heat-shrinkable thermoplastic film, closing both ends of said tubing and shrinking it snugly all around the shirred stick
  • the diameter of the outer tubing of heat-shrinkable material according to the teaching of said US-A-3,528,825, it would also be possible to avoid removal of the shrunk outer wrapping before stuffing or loading to the stuffing horn, thus preventing accidental deshir ⁇ ng
  • this method might satisfactorily be used when shirred sticks of heat-stable tubular films are packaged, it cannot be used when the shirred sticks are made with a heat-shrinkable material as the heat treatment required to shrink the outer wrapping will negatively affect the shirred stick
  • the inner packaged stick will shrink Furthermore it will shrink in an uncontrolled manner, where parts of it will shrink more than others, thus leading to an uncontrolled and non uniform diameter of the shirred stick tubing
  • US-A-4,671 ,414 also uses shnnkable materials, in particular sh ⁇ nkable net films, for wrapping up shirred sticks
  • shnnkable materials in particular sh ⁇ nkable net films
  • the shirred sticks are enveloped between two webs of net film projecting at both ends of the sticks, and are enclosed therein by shrinking the net film projecting ends to form a circular opening, the diameter of which is smaller than the diameter of the shirred stick
  • this method therefore cannot be used for the packaging of shirred sticks of heat-shrinkable films as the heat treatment at the stick ends will give uncontrolled shrink of the packaged shirred stick
  • this method will not avoid contamination of the inner surface of the shirred stick, e g by atmospheric dust, nor it will reduce considerably the danger of the stick to be damaged during handling
  • the film is preferably oriented and has heat-shrinking properties
  • sausage meat decreases in volume by about 15-20 %
  • a comparable shrink of the film where it is packaged, at the temperature used for cooking, is therefore necessary or at least desirable in order to keep the film in contact with the sausage meat
  • the shrink should be controlled as a too high shrink could split the film, while in other applications, particularly when intermediate or large size tubings are employed, a high shrink is generally highly appreciated
  • An object of the present invention is therefore to provide a method of packaging a shirred stick to avoid accidental deshirring and contamination of the stick inner surface
  • Another object of the present invention is to provide a method of packaging a shirred stick to avoid accidental deshirring and contamination of the stick inner surface, applicable also to shirred sticks of an oriented heat-shrinkable material
  • Still another object is to provide a wrapped shirred stick that can be easily manufactured and easily loaded on the customer stuffing machine without accidental deshirring of the stick at the loading step, wherein the shirred stick may also be of heat-shrinkable material
  • Fig 1 a is a schematic representation of a length of a tubing used as the shirred stick packaging material
  • Fig 1 b is a schematic view of the same length of tubing wherein one of the two ends has been closed
  • Fig 1 c is a schematic view of the same length of tubing wherein part of the tubing, comprising the closed end, is shrunk
  • the sequence of the Figures 1 a - 1 b ⁇ 1 c actually corresponds to the sequence of process steps for the preparation of the tubing used for packaging the shirred stick
  • Fig 2 is a schematic representation of a conventional shirred stick of tubular
  • Fig 3 is a schematic representation of a tubing of Fig 1 c loaded with the shirred stick of Fig 2
  • Fig 4 is a schematic view of the wrapped shirred stick according to the present invention
  • Fig 5 is a schematic view of the wrapped shirred stick according to the present invention ready to be loaded on the stuffing machine
  • Fig 6a represents an embodiment of the tubing of Fig 1 a while Fig 6c represents an embodiment of the partially shrunk tubing of Fig 1 c obtained starting from a tubing as in Fig 6a
  • a first object of the present invention is a wrapped shirred stick wherein, with reference to Fig 4, the shirred stick (2) is enclosed in a suitable length of a partially shrunk outer wrapping tubing (1 ), closed at both ends, characterized in that at least part (7) of the surface of said tubing which is adjacent to the shirred stick end (8) that will be loaded onto the stuffing horn, is shrunk
  • the outer wrapping tube (1 ) that contains the shirred stick (2) is closed at both ends, a first end (3) and a second end (5) by closing means (4) and (6) respectively Part of the outer tubing (1 ), indicated by the numeral (7) and schematically represented in the Figure by a hatched zone, is heat-shrunk
  • the shirred stick end (8) adjacent to said shrunk area (7) is the end which will be loaded onto the stuffing horn (not shown in the attached Figures) in the stuffing process
  • the wrapped shirred stick according to the present invention is obtained by first introducing the shirred stick into the partially shrunk tubing closed at one end of Fig 1 c Said partially shrunk tubing of Fig 1 c is obtained from a suitable length of the tubing of heat-shrinkable thermoplastic film of Fig 1 a
  • the diameter of the starting tubing is larger than that of the shirred stick to be packaged
  • the diameter of this tubing is only slightly larger than that of the shirred stick so as to allow the easy introduction of the shirred stick into the tubing while preventing the possibility of a substantial bending of the shirred stick within the pack
  • a tubing of a diameter from about 1 to about 50 % larger than that of the shirred stick to be packed is suitably employed
  • said tubing will have a diameter from about 2 to about 25 % larger than that of the shirred stick to be packaged and more preferably from about 5 to about 15 % larger than that of the shirred stick
  • the tubing is closed at a first end (3), by means of a plastic or metal clip, a wire, a string, an adhesive tape, or any other means (4)
  • the tubing can also be closed by sealing Preferably however it will not be flattened but gather-sealed using however any appropriate sealing method
  • a part (I') of said tubing, comprising the closed end (3), will then be submitted to a heat treatment to get a substantial shrink thereof
  • the length of the tubing that will be submitted to the heat treatment (I') will depend on the size (diameter) of the shirred stick to be packaged, and the % longitudinal shrink of the tubing at the temperature selected for the heat treatment
  • the aim of said heat-treatment is to get a thickening and strengthening of that part of the tubing, identified in the end package of Fig 4 with the numeral (7), which will be adjacent to the shirred stick end (8) to be loaded onto the filling horn
  • the thickening and strengthening of said area will give raise to a shape stability thereof
  • a conventional shirred stick as represented in Fig 2 and indicated as (2), is then introduced into the partially shrunk tubing of Fig 1 c, with the end that will be loaded onto the stuffing horn towards and adjacent to the shrunk and closed end (3) of the outer wrapping tube
  • This can be done either manually or, preferably, automatically In this latter case the use of an auxiliary mandrel to which the shirred stick is transferred after compaction, would allow the correct insertion of the shirred stick into the tubing of Fig 1 c
  • Figure 3 is a schematic representation of this intermediate step in the packaging process, where the shirred stick has been introduced into the tubing of Fig 1 c
  • the packaging process is then completed by closing the other end of the tubing (5) This can be done by means of any conventional closing means (6) Suitable closing means are e g those already indicated for closing means (4) While however the closing means (4) need to withstand a heat-treatment, there are no similar limitations for the closing means (6)
  • a second object of the present invention is therefore a method of manufacturing a wrapped shirred stick which method comprises closing one end (3) of a suitable length of a tubing of heat-shrinkable thermoplastic film by closing means (4), submitting a part (I') of said tubing, comprising the closing means (4) to a heat-treatment to get a substantial shrink thereof, introducing the shirred stick (2) into the partially shrunk tubing (1 ), with the shirred stick end that will be loaded onto the stuffing horn towards and adjacent to the shrunk part (7) of said partially shrunk tubing (1 ), and then closing the other end (5) of the tubing (1 ) by closing means (6)
  • the length (I) of the starting heat-shrinkable tubing of Fig 1 a can therefore be suitably calculated on the basis of the length of the shirred stick, considering the additional length required to close both ends and the decrease in length due to the shrinkage of the length (I') of the tubing
  • the heat-shrinkable tubing will generally have a thickness of > 30 ⁇ m, preferably > 40 ⁇ m, and even more preferably > 50 ⁇ m
  • the heat-shrinkable film used for the wrapping tubing should have a longitudinal shrink of at least 20 %, preferably at least 25 %, and even more preferably at least 30 % at the temperature at which the heat treatment is carried out Free shrink is evaluated by ASTM Method D 2732
  • a tubing of a heat-shrinkable material 40-50 ⁇ m thick, may suitably be employed having a diameter of 23 cm
  • One end of said tubing is clipped
  • the length of tubing, from the end closure, that is submitted to a heat treatment at that temperature can suitably be comprised between about 6 and about 15 cm, also depending on the size of the central hole (9) required to fit the stuffing horn
  • heat-shrinkable tubing needs to be heat-shrinkable at least in the longitudinal direction
  • tubings heat-shrinkable both in the longitudinal and in the transverse directions are employed
  • Heat-shrinkable tubings are preferably obtained by extrusion, or by co- extrusion or extrusion-coating in case of multi-layer films, followed by orientation of the thus obtained primary tape, longitudinally and preferably also transversely
  • orientation identifies a stretching process carried out at a temperature higher than the Tg of the resins employed in the film and lower than the melting point thereof, i e at a temperature at which said primary tape is not in the molten state
  • Said heat-shrinkable tubings are preferably obtained via extrusion through a round die, quenching of the primary tubular tape thus obtained, re-heating of said tubular tape to the suitably selected orientation temperature and orientation by the trapped bubble method, wherein transversal orientation, if any, is obtained by increasing the internal air pressure and longitudinal orientation is provided by a differential speed of the pinch rolls which hold the trapped bubble
  • transversal orientation if any, is obtained by increasing the internal air pressure and longitudinal orientation is provided by a differential speed of the pinch rolls which hold the trapped bubble
  • the above method will allow the formation of seamless tubings
  • the oriented, heat-shrinkable film thus obtained when heated to a temperature close to the orientation one, will show a substantial free shrink
  • oriented, heat-shrinkable films obtained by stretching the primary tape at a temperature comprised between about 50 °C and about 98 °C it will be possible to shrink them to a substantial extent by heating them by immersion for few seconds in hot water
  • immersion in hot water the length (I') of closed tubing that is submitted to the heat treatment can better be controlled
  • preferred outer wrapping tubings will be those showing a longitudinal shrink of at least 20 %, preferably at least 25 %, and even more preferably at least 30 %, at a temperature ⁇ 98 °C
  • oriented, heat-shrinkable tubings are preferred for wrapping shirred sticks according to the present invention
  • a less preferred but still available alternative is to use a substantially non oriented heat-shrinkable film, such as a film obtained by the hot blown method where the film is stretched while still in the molten state By heating a hot blown film to a temperature close to the melting temperature of the resins employed a substantial shrink, particularly in the longitudinal direction, will be obtained
  • the heat-shrinkable film used for the wrapping tube may be a mono-layer or a multi-layer structure Any thermoplastic resin can be used therein as known in the art Moisture permeable or substantially impermeable resins can be employed depending on the desired permeability of said wrapping tubing
  • the heat-shrinkable film used for the wrapping tubing will comprise a gas-barrier resin, such as PVDC (saran), ethylene-vinyl alcohol copolymers, poly-vinyl alcohol copolymers, polyamides, and the like resins
  • a gas-barrier resin such as PVDC (saran), ethylene-vinyl alcohol copolymers, poly-vinyl alcohol copolymers, polyamides, and the like resins
  • the film can be transparent or opaque, clear or colored, and can contain the conventional additives used in the field It can be cross-linked, either by irradiation or chemically or both It may also be printed and bear instructions for use or indications of the type and characteristics of the shirred stick packaged therein
  • the wrapped shirred stick according to the present invention can then be safely handled without problems of contamination of the inner surface of the stick Furthermore, as it is conventionally known in the art to distribute a lubricating agent, such as oil or waxes, on the outer surface of the tubing to facilitate shirring and deshirring at the stuffing station, the use of an envelope instead of an open net will prevent loss of the lubricating agent during shipping, storing and handling of the shirred stick
  • the closure (6) at the other end (5) of the wrapping tubing will then be removed, e g by opening the clip or removing the wire, string, etc , and the stuffing process can then be initiated

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Food Science & Technology (AREA)
  • Packages (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un boyau enroulé et froncé, comme illustré dans la figure, qui consiste à fermer une extrémité (3) de longueur souhaitée d'un tube en film thermoplastique thermorétractable au moyen d'éléments de fermeture (4), à soumettre une partie (I') dudit tube, y compris l'élément de fermeture (4), à un traitement thermique en vue de son rétrécissement sensible, à introduire le boyau froncé (2) dans le tube partiellement rétréci (1), l'extrémité froncée du boyau étant chargée sur le tube de bourrage vers et adjacent à la partie rétrécie (7) dudit tube partiellement rétréci (1), puis à fermer l'autre extrémité (5) du tube (1) au moyen d'éléments de fermeture (6). Ce procédé est très simple et peut être mis en oeuvre pour emballer des boyaux froncés de films thermorétractables. Le boyau ainsi obtenu peut être chargé sur la machine à bourrer sans modifier accidentellement les parties rétrécies du boyau lors de son chargement.
PCT/EP1999/003182 1998-05-18 1999-05-10 Boyau emballe et fronce de film tubulaire pour emballage d'aliments et son procede de fabrication WO1999059416A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU41406/99A AU4140699A (en) 1998-05-18 1999-05-10 Wrapped shirred stick of tubular film for food packaging and method of making it

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP98108991 1998-05-18
EP98108991.5 1998-05-18

Publications (1)

Publication Number Publication Date
WO1999059416A1 true WO1999059416A1 (fr) 1999-11-25

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PCT/EP1999/003182 WO1999059416A1 (fr) 1998-05-18 1999-05-10 Boyau emballe et fronce de film tubulaire pour emballage d'aliments et son procede de fabrication

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Country Link
AU (1) AU4140699A (fr)
WO (1) WO1999059416A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002100180A1 (fr) * 2001-06-13 2002-12-19 Ab Tripasin Filet tubulaire contenant un boyau vide
WO2005110101A1 (fr) * 2004-05-03 2005-11-24 Teepak Properties, Llc Systeme a boyaux alimentaires alimente par bande
US7476147B2 (en) 2004-05-03 2009-01-13 Viskoteepak Belgium Nv Belt fed food casing system
EP2019042A1 (fr) * 2001-06-12 2009-01-28 Sangenic International Limited Bobine pour dispositif de stockage de dechets
EP3162212A1 (fr) * 2015-11-02 2017-05-03 Hilmar Reiß Tube sans butée pour boyaux de saucisse et procédé pour sa fabrication

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3528825A (en) 1967-12-04 1970-09-15 Union Carbide Canada Ltd Shrink wrapped shirred casings
NL7505413A (nl) * 1974-05-08 1975-11-11 Union Carbide Corp Zelfdragende "stick" en werkwijze tot verkrijging daarvan.
FR2291015A1 (fr) * 1974-11-18 1976-06-11 Union Carbide Corp Baton tubulaire renforce de boyau plisse et comprime et son procede de fabrication
US4013099A (en) 1975-03-12 1977-03-22 Hoechst Aktiengesellschaft Sheathed tubular stick
GB1526782A (en) 1976-07-16 1978-09-27 Oppenheimer Casing Co Ltd Package for shirred casing material and a method of producing it
EP0004638A1 (fr) * 1978-04-06 1979-10-17 Hoechst Aktiengesellschaft Gaine tubulaire à filets de boyau plissé et son procédé de fabrication
EP0027592B1 (fr) 1979-10-19 1983-01-26 Gerhard Peter KG Boyau tubulaire plissé enveloppé dans un tube de filet
EP0066193B1 (fr) 1981-05-27 1985-04-10 Teepak, Inc. Bâton de boyau plissé gainé
US4671414A (en) 1982-12-28 1987-06-09 Wolff Walsrode Aktiengesellschaft Process for packing tubular shirred food tubular casings

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3528825A (en) 1967-12-04 1970-09-15 Union Carbide Canada Ltd Shrink wrapped shirred casings
NL7505413A (nl) * 1974-05-08 1975-11-11 Union Carbide Corp Zelfdragende "stick" en werkwijze tot verkrijging daarvan.
FR2291015A1 (fr) * 1974-11-18 1976-06-11 Union Carbide Corp Baton tubulaire renforce de boyau plisse et comprime et son procede de fabrication
US4013099A (en) 1975-03-12 1977-03-22 Hoechst Aktiengesellschaft Sheathed tubular stick
GB1526782A (en) 1976-07-16 1978-09-27 Oppenheimer Casing Co Ltd Package for shirred casing material and a method of producing it
EP0004638A1 (fr) * 1978-04-06 1979-10-17 Hoechst Aktiengesellschaft Gaine tubulaire à filets de boyau plissé et son procédé de fabrication
EP0027592B1 (fr) 1979-10-19 1983-01-26 Gerhard Peter KG Boyau tubulaire plissé enveloppé dans un tube de filet
EP0066193B1 (fr) 1981-05-27 1985-04-10 Teepak, Inc. Bâton de boyau plissé gainé
US4671414A (en) 1982-12-28 1987-06-09 Wolff Walsrode Aktiengesellschaft Process for packing tubular shirred food tubular casings

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2019042A1 (fr) * 2001-06-12 2009-01-28 Sangenic International Limited Bobine pour dispositif de stockage de dechets
WO2002100180A1 (fr) * 2001-06-13 2002-12-19 Ab Tripasin Filet tubulaire contenant un boyau vide
WO2005110101A1 (fr) * 2004-05-03 2005-11-24 Teepak Properties, Llc Systeme a boyaux alimentaires alimente par bande
US7476147B2 (en) 2004-05-03 2009-01-13 Viskoteepak Belgium Nv Belt fed food casing system
EP3162212A1 (fr) * 2015-11-02 2017-05-03 Hilmar Reiß Tube sans butée pour boyaux de saucisse et procédé pour sa fabrication

Also Published As

Publication number Publication date
AU4140699A (en) 1999-12-06

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