GB2126191A - Packaging foodstuffs - Google Patents

Packaging foodstuffs Download PDF

Info

Publication number
GB2126191A
GB2126191A GB08321211A GB8321211A GB2126191A GB 2126191 A GB2126191 A GB 2126191A GB 08321211 A GB08321211 A GB 08321211A GB 8321211 A GB8321211 A GB 8321211A GB 2126191 A GB2126191 A GB 2126191A
Authority
GB
United Kingdom
Prior art keywords
casing
film
heat
edges
seal 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.)
Granted
Application number
GB08321211A
Other versions
GB2126191B (en
GB8321211D0 (en
Inventor
Hiromichi Inagaki
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.)
Nihon Tokkyo Kanri Co Ltd
Original Assignee
Nihon Tokkyo Kanri Co 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 Nihon Tokkyo Kanri Co Ltd filed Critical Nihon Tokkyo Kanri Co Ltd
Publication of GB8321211D0 publication Critical patent/GB8321211D0/en
Publication of GB2126191A publication Critical patent/GB2126191A/en
Application granted granted Critical
Publication of GB2126191B publication Critical patent/GB2126191B/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • A—HUMAN NECESSITIES
    • A22—BUTCHERING; MEAT TREATMENT; PROCESSING POULTRY OR FISH
    • A22C—PROCESSING MEAT, POULTRY, OR FISH
    • A22C13/00—Sausage casings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/26—Articles or materials wholly enclosed in laminated sheets or wrapper blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B32B2307/736—Shrinkable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Meat And Fish (AREA)
  • Packages (AREA)
  • Laminated Bodies (AREA)

Abstract

In a package for ham, sausage or similar food products, a casing (1) comprising a heat-sealable plastics film (3) laminated onto the inner surface of shrink nylon film (2) is curved into a cylindrical form so that two edges (1a, 1b) thereof overlap each other, and the inside of this overlapped portion is covered with a tape (6) made of the same laminate as that of the casing film (3). This tape is heat sealed onto the casing film to form an integral back patch (6). <IMAGE>

Description

SPECIFICATION Packaging foodstuffs This invention relates to the packaging of foodstuffs. In this packaging of foodstuffs such as ham, sausage, ground fish, meat or similar food products, casings of plastics materials are known which are packed with such food and heated (boiled) so that the casing is heat shrunk into a creaseless, stretched state tightly enclosing the food product.
Figure 1 of the accompanying drawings illustrates a known casing made of shrink nylon and having a back patch. In this known structure, a casing film 03 formed from a shrink nylon film 01 and a heat seal layer (polyethylene layer) 02 laminated onto the inner surface of the nylon film is curved to bring both edges thereof into butt contact, and adhesive tape 06 formed from a shrink nylon film 05 and a heat seal layer (polyethylene layer) 04 laminated onto the inner surface (bonded side) of the nylon film is applied to the inside of the butt-joint area of the casing film 03 and is heat sealed to said casing film 03 to make a cylindrical casing.
In this known structure, when the casing is used as a commercial article by packing meat or a similar foodstuff therein, closing both open ends of the casing by a clip or other fastening means, heat sterilising the pack by boiling and then cooling it, the butt-joined edges of the casing film 03 tend to curl outward as shown in Figure 2 of the accompanying drawings due to differences in the heat shrinkage characteristics between the nylon film 01 and the heat seal layer 02.
Too much curling weakens the bonding strength of this joint because the bonded area of the adhesive tape 06 is reduced, resulting in breakage of the pack. A solution to this problem is to use a wider adhesive tape 06 to provide an enlarged bonded area between the adhesive tape 06 and the casing film 01, but such an enlargement of the bonded area is impractical for a commercial product as it necessitates a large volume of adhesive tape and also requires more expensive heat sealing.
Further, projecting film edges such as those shown in Figure 2 make the external appearance of the product unsightly to reduce its commercial value.
A primary object of this invention is to eliminate this problem.
In accordance with one aspect of the present invention there is provided a method of packaging a food product, such as ham or sausage, in a casing of a heat shrinkable plastics material lined internally with a heat seal layer of plastics material, wherein opposite edges of the casing are brought into overlapping relation and a back patch of similar construction to the casing is applied to the interior of the casing to bridge the overlapped edges with the heat seal layer of the back patch in contact with both said edges before the packed food product is subjected to heat treatment to sterilise and/or shrink wrap the same.
In accordance with another aspect of the present invention there is provided a food product, such as ham or sausage, packaged in a casing of a heat shrinkable plastics material lined internally with a heat seal layer of plastics material, wherein opposite edges of the casing are in overlapping relation and a back patch of similar construction to the casing is interposed between the food product and the overlapped edges of the casing with the heat seal layer of the back patch fused by heat treatment to both of the overlapped edges of the casing.
The heat seal layer of the casing and of the back patch is preferably a polyethylene film.
A preferred embodiment of the present invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a sectional elevation of the joint area of a known ham packaging casing in which the two edges of the casing film are brought into abutment and adhesive tape is bonded to the inside of the casing across the edges of the casing to secure them in position, Figure 2 is a view similar to Figure 1 showing the curled condition of the edges of the casing over the back patch after heat sterilisation of the assembly of Figure 1, Figure 3 is a sectional view of a casing in accordance with the present invention showing the condition of the back patch area of the casing in which the two edges of the casing are overlapped and adhesive tape is applied to the inside thereof to secure the edges together, Figure 4 is a view similar to Figure 3 showing the condition of the casing of Figure 3 after heat sterilisation, and Figure 5 is a perspective view on a smaller scale of a ham packed in a casing according to this invention.
The present invention provides a back patch for a casing for packaging ham, sausage or the like, the back patch being capabie of retaining a desired bonding strength even after heat sterilisation. According to this invention, the two edges of a casing film made of shrink nylon with a heat seal layer (for example a polyethylene layer) on the inside thereof are brought toward each other and placed one over the other (overlapped) to form a cylindrical film, and then adhesive tape, which also has a heat seal layer on its bonding side, is applied to the inside of the overlapped edges of the casing film and is heat sealed thereto to join the edges of the casing film securely.
According to this back patch arrangement, when the adhesive tape is heat sealed, the over lapping edges of the casing film are also bonded together because the heat seal layer on the inside of the upper overlapping casing film edge is fused and bonded to the adjacent surface of the nylon film. Accordingly, no curling of the joined and bonded film edges takes place during the process until the heat sterilisation treatment.
When the casing film shrinks after heat sterilisation, the upper film edge will peel off and curl. This curling may extend over the entire width of the overlapped film edges when this portion is small in area. This curling occurs due to the difference in heat shrinkage characteristics between the shrink nylon film and the heat seal layer, so that if the width of the overlapped area is designed to make allowance for this difference, it is possible to prevent such curling occurring over the whole width of the overlapped area.
As described above, the overlapped edges of the casing film are joined together by adhesive tape applied to the inside thereof so that curling is allowed to take place only at the overlapped portion of the film but is prevented from occurring in the heat sealed area between the adhesive tape and the casing film, so that the strength of this back patch section of the film is unchanged after the heat treatment for sterilisation. Thus, it is a salient feature of this invention that curling caused by sterilisation heating is allowed to take place only at the overlapped part of the casing film but is prevented from occurring beyond the width of the adhesive tape (back patch) as described above to prevent any reduction in strength of the back patch area of the casing.
Figure 3 illustrates the above embodiment of this invention. In the drawing, numeral 1 indicates a casing film of shrink nylon film 2 with a polyethylene film 3 laminated onto the inner surface of the nylon film. Two edges 1 a and 1 b of the casing film 1 are brought toward each other and placed one (lea) over the other ( 1 b) to form a film cylinder.
Numeral 6 refers to adhesive tape composed of shrink nylon film 4 with polyethylene film 5 laminated onto the inner surface thereof. This adhesive tape 6 is thus the same in material and structure as the casing film 1. The adhesive tape 6 is applied to the inside of the overlapped edges of the casing film 1, thus covering the casing film edge 1 b on the inside, and is heat sealed to joint the two overlapped film edges la and 1 b. In this heat sealing operation, the laminated film is pressed from both the outside of the adhesive tape 6 and the outside of the casing film 1 by heated bars, inducing not only fusion of the polyethylene 3 of the casing film 1 and the polyethylene 5 of the adhesive tape 6 but also simultaneous melting of the polyethylene 3 on the inner surface of the casing film end 1 a overlying the other edge 1 b, causing the melted polyethylene 3 to bond, if not so strongly, to the adjacent surface of the nylon film 2.
When using the casing made of shrink nylon having the above structure according to this invention, meat or other food is packed into the casing, both ends thereof are closed hermetically with clips or other means 7 as shown in Figure 5, and then the whole pack is subjected to heat sterilisation. The pack is heated again for a short period of time to remove the creases formed on the film surface by the sterilisation heating, and is offered as a commercial product.
In the heat sterilisation step, a difference in heat shrinkage between the shrink nylon 2 and the polyethylene 3 is produced by heating and moisture absorption, causing curling of the upper film edge la outwardly of the casing, but the back patch portion of the casing film 1 remains bonded securely due to the adhesive tape 6 bonded onto the inside thereof. Therefore, there is no likelihood that the casing weakens and breaks in its back patch area.
It is also of significance that curling only occurs at the upper film edge 1 a, that is, only one curled strip is produced on the casing, which can halve the spoiling of the external appearance caused by the formation of two curled strips on known casings.

Claims (5)

Claims
1. A method of packaging a food product, such as ham or sausage, in a casing with a heat shrinkable plastics material lined internally with a heat seal layer of plastics material, wherein opposite edges of the casing are brought into overlapping relation and a back patch of similar construction to the casing is applied to the interior of the casing to bridge the overlapped edges with the heat seal layer of the back patch in contact with both said edges before the packed food product is subjected to heat treatment to sterilise and/or shrink wrap the same.
2. A method as claimed in claim 1, wherein the heat seal layer of the casing and of the back patch is a polyethylene film.
3. A food product, such as ham or sausage, packaged in a casing of a heat shrinkable plastics material lined internally with a heat seal layer of plastics material, wherein opposite edges of the casing are in overlapping relation and a back patch of similar construction to the casing is interposed between the food product and the overlapped edges of the casing with the heat seal layer of the back patch fused by heat treatment to both of the overlapped edges of the casing.
4. A packaged food product as claimed in claim 3, wherein the heat seal layer of the casing and of the back patch is a polyethylene film.
5. A method of packaging a food product and a packaged food product substantially as described in the Description with reference to and as shown in Figures 3-5 of the accomapanying drawings.
GB08321211A 1982-09-01 1983-08-05 Packaging foodstuffs Expired GB2126191B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1982132481U JPS5938266U (en) 1982-09-01 1982-09-01 Shrink nylon casing backing structure

Publications (3)

Publication Number Publication Date
GB8321211D0 GB8321211D0 (en) 1983-09-07
GB2126191A true GB2126191A (en) 1984-03-21
GB2126191B GB2126191B (en) 1985-09-11

Family

ID=15082379

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08321211A Expired GB2126191B (en) 1982-09-01 1983-08-05 Packaging foodstuffs

Country Status (13)

Country Link
JP (1) JPS5938266U (en)
KR (1) KR840005651A (en)
AT (1) AT386928B (en)
AU (1) AU542727B2 (en)
CA (1) CA1195545A (en)
DE (1) DE3327089A1 (en)
DK (1) DK399383A (en)
FR (1) FR2532281B1 (en)
GB (1) GB2126191B (en)
IT (1) IT1161500B (en)
NZ (1) NZ204963A (en)
SE (1) SE464078B (en)
ZA (1) ZA836097B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8701443A (en) * 1986-06-25 1988-01-18 Proveedora Hispan Holandes Sa ART PACKAGING FOR MEAT PRODUCTS AND THE LIKE.
US4940614A (en) * 1988-04-13 1990-07-10 Hoechst Aktiengesellschaft Tubular casing having an adhesive tape in the direction of its longitudinal axis
EP0432942A1 (en) * 1989-12-12 1991-06-19 Nihon Tokkyo Kanri Company Limited Sausage casings
WO1997004959A2 (en) * 1995-07-28 1997-02-13 W.R. Grace & Co.-Conn. Film, backseamed casings therefrom, and packaged product using same
WO1997012758A1 (en) * 1995-10-06 1997-04-10 W.R. Grace & Co.-Conn. Backseamed casing and packaged product incorporating same
WO2003030647A1 (en) * 2001-10-08 2003-04-17 Poly-Clip System Gmbh & Co. Kg Method for producing a casing
US6764729B2 (en) 1992-06-05 2004-07-20 Cryovac, Inc. Backseamed casing and packaged product incorporating same
EP3663219A4 (en) * 2018-08-15 2021-05-05 Savelev, Dmitrii Viktorovich Packaging

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9403249U1 (en) * 1994-02-26 1994-06-30 Westfälische Fleischwarenfabrik Stockmeyer GmbH & Co KG, 48336 Sassenberg sausage

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2897087A (en) * 1956-03-05 1959-07-28 Tee Pak Inc Food package
SE300784B (en) * 1963-02-14 1968-05-06 Tetra Pak Ab
GB1013656A (en) * 1963-05-21 1965-12-15 Tetra Pak Ab A tube or tubular package formed from a packing laminate
GB1041117A (en) * 1963-05-21 1966-09-01 Tetra Pak Ab A packing laminate and a method of manufacturing a tube thereof
CH453934A (en) * 1965-02-12 1968-06-14 Rheinische Blattmetallgesellsc Method for producing a sausage-like package
DE2352553C3 (en) * 1973-10-19 1979-03-22 Alkor-Werk Karl Lissmann Gmbh & Co Kg, 8000 Muenchen Use of a PA-PE composite hose as a sausage casing for cooked sausages
DE2903117A1 (en) * 1979-01-27 1980-08-14 Wolff Walsrode Ag COUPLED TUBULAR SLEEVE, METHOD FOR THE PRODUCTION THEREOF, DEVICE FOR EXERCISING THE METHOD AND USE OF THE HOSE SLEEVE AS A PACKAGING MEANS
JPS5626001A (en) * 1979-08-02 1981-03-13 Keinan Sanki Kk Apparatus for preventing abnormal fineness
DE3013320A1 (en) * 1980-04-05 1981-10-15 Hoechst Ag, 6000 Frankfurt FOR FOODSTUFFS, IN PARTICULAR SAUSAGE PRODUCTS, TUBULAR SLEEVE SUITABLE WITH A STITCHED SEAM AND METHOD FOR THEIR PRODUCTION
JPS5796925A (en) * 1980-11-27 1982-06-16 Nihon Totsukiyo Kanri Kk Connection of bag
DE3105718A1 (en) * 1981-02-17 1982-09-02 Hoechst Ag, 6000 Frankfurt FOR FOODSTUFFS, ESPECIALLY SAUSAGE PRODUCTS, SUITABLE SMOKE-PERMITTING TUBULAR SLEEVE WITH A STITCHED STITCH AND METHOD FOR THE PRODUCTION THEREOF

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8701443A (en) * 1986-06-25 1988-01-18 Proveedora Hispan Holandes Sa ART PACKAGING FOR MEAT PRODUCTS AND THE LIKE.
US4940614A (en) * 1988-04-13 1990-07-10 Hoechst Aktiengesellschaft Tubular casing having an adhesive tape in the direction of its longitudinal axis
EP0432942A1 (en) * 1989-12-12 1991-06-19 Nihon Tokkyo Kanri Company Limited Sausage casings
US6764729B2 (en) 1992-06-05 2004-07-20 Cryovac, Inc. Backseamed casing and packaged product incorporating same
US7540834B2 (en) 1992-09-25 2009-06-02 Cryovac, Inc. Backseamed casing and packaged product incorporating same
WO1997004959A2 (en) * 1995-07-28 1997-02-13 W.R. Grace & Co.-Conn. Film, backseamed casings therefrom, and packaged product using same
US5866214A (en) * 1995-07-28 1999-02-02 W. R. Grace & Co.-Conn. Film backseamed casings therefrom, and packaged product using same
US6110600A (en) * 1995-07-28 2000-08-29 Cryovac, Inc. Film, backseamed casings therefrom, and packaged product using same
WO1997004959A3 (en) * 1995-07-28 1997-07-03 Grace W R & Co Film, backseamed casings therefrom, and packaged product using same
WO1997012758A1 (en) * 1995-10-06 1997-04-10 W.R. Grace & Co.-Conn. Backseamed casing and packaged product incorporating same
WO2003030647A1 (en) * 2001-10-08 2003-04-17 Poly-Clip System Gmbh & Co. Kg Method for producing a casing
US7059102B2 (en) 2001-10-08 2006-06-13 Poly-Clip System Gmbh & Co. Kg Method for producing a casing
EP3663219A4 (en) * 2018-08-15 2021-05-05 Savelev, Dmitrii Viktorovich Packaging

Also Published As

Publication number Publication date
AU542727B2 (en) 1985-03-07
IT8367758A0 (en) 1983-07-13
NZ204963A (en) 1985-11-08
FR2532281B1 (en) 1987-01-09
ZA836097B (en) 1984-04-25
CA1195545A (en) 1985-10-22
SE8304454D0 (en) 1983-08-17
AU1528183A (en) 1984-03-08
DK399383A (en) 1984-03-02
ATA311683A (en) 1988-04-15
FR2532281A1 (en) 1984-03-02
AT386928B (en) 1988-11-10
DE3327089A1 (en) 1984-03-01
SE8304454L (en) 1984-03-02
KR840005651A (en) 1984-11-16
GB2126191B (en) 1985-09-11
IT1161500B (en) 1987-03-18
JPS5938266U (en) 1984-03-10
DK399383D0 (en) 1983-09-01
GB8321211D0 (en) 1983-09-07
SE464078B (en) 1991-03-04

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 20030804