CA2017849A1 - Package and a method for sealing the package - Google Patents
Package and a method for sealing the packageInfo
- Publication number
- CA2017849A1 CA2017849A1 CA 2017849 CA2017849A CA2017849A1 CA 2017849 A1 CA2017849 A1 CA 2017849A1 CA 2017849 CA2017849 CA 2017849 CA 2017849 A CA2017849 A CA 2017849A CA 2017849 A1 CA2017849 A1 CA 2017849A1
- Authority
- CA
- Canada
- Prior art keywords
- tray
- lid
- plastic film
- package
- plastics material
- 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.)
- Abandoned
Links
Landscapes
- Packages (AREA)
Abstract
1990-05-30 14:26 L A GROTH & CO AB 46 8 316767 05 ABSTRACT
A package comprising a tray and a removable lid, which tray is made of plastics material and is especially intended for keeping and heating of ready-cooked food, and which lid is made of cardboard and/or plastics material. The package includes a plastic film (3) the area of which is at least as large as that of the lid (2) and which is heat-sealed to the lid and to the edge (la) surrounding the opening of the tray (1) and the characteristics of which are such that the lid and the plastic film are removable from the edge without the lid or the tray being destroyed.
The invention also comprises a method for sealing the package.
A package comprising a tray and a removable lid, which tray is made of plastics material and is especially intended for keeping and heating of ready-cooked food, and which lid is made of cardboard and/or plastics material. The package includes a plastic film (3) the area of which is at least as large as that of the lid (2) and which is heat-sealed to the lid and to the edge (la) surrounding the opening of the tray (1) and the characteristics of which are such that the lid and the plastic film are removable from the edge without the lid or the tray being destroyed.
The invention also comprises a method for sealing the package.
Description
1~9~-05-~ 14: 17 L R GROTH 8~ CO RB 46 8 316767 0Z
)i'7849 "DES~RIPTION
Technical field The pre~ent i~ventlon relate~ to a package and a method for sealing $he pac~age. The package comprlse~ a tr~y e~peclally lntended or keep1ng and heating ready-c~o~ed food, and a lld which i~ removable from the tray.
PriQ~ art It iB known to keep and to heat ready-cooked Pood in packages con~isting of a tray provided wlth a lld. it i8 essential that the food ~hould not be affected by the packaging materlal and that the lld should be ea~lly removable from the tray.
A package fulSllllng the8e requlrement~ comp~l~e8 an aluminium tray wlth a cardboard and/or alumin1um llq which ~8 attached to the tray by fol~ing the ed~e~ surroundl~g the opening of the tray inwardly over the lld, and whLch, can be removed therefrom after sald sdges have b en folded ,~way from the lid. Di~adva~tage~ of thls package are that seal~ng ls carried out manually, that the fo~d'cannot ~e heate~!ln~lde the package ln a microwave oven and that the ~eallng wlll not be liquldproof. ,' A package ln which the ~ood can be neated ln a micro-wave oven and whlch can be sealed mechanlcally compr~e~ atray of plastic~ material such as aPET and a lld made of plastic-coated cardboard, which ~ld can be welded ~heat-sealed~ to the edges of the trsy opening. A dlsadv~n,tage o this kind of package iA that the lld i8 dlfflcult to re~ove from the tray and often break~ when beinq removed.
Further, lt i~ ~nown to weld a plastic film to a CPE~
tray. Wit~ thl~ ~$nd of packa~e lt i8 difficult to tear and to remove t~e film without touchln~ the food. Moreover,,it i9 not po~slble to provlde the film with informatlon in tho,form of, for example, advertislny or a text statln~ the contents of the package, and packages of th$a,kind are theFefore often supplied ln cardboard cases provided;~w$t~-" uch infor~ation.-1 ~3gQ-~5-~ 14 ~ L i~ ~ROTH ~ C~l RR 46 8 31 l~i f 6~ 01 ;~)i'7~4 Desc~lption of ~he inv,e,~o,n It 1B an ob~ect of the pre~ent lnventlon to lmprove packages of the above-mentioned klnd and to seal these ln a ~lmple, nonexpen~ive and efflcient way.
Thls o~ect i~ accompl~hed by provldinq the p,ackage of the inventlon with the features tated in the charac!terlzlng portions of the claims.
~e~cr~PtiOn of the fiqure~
The one figure of the drawing 18 a schematic, explodod perspective view showlng sealing of a package accord~ng to the invention.
Preferred embodiment The package according to the ~nvention comprl~s a tray 1 of thermoformed CPET with an opening surrounded by a folded, approximately 5 mm wlde edge which extends roun~ the whole of the tray 1, a l~d 2 of cardboard and pla~t~cq mater~al, suitably a mater~al marketed under the name of Inver,~ote (registered trademark) G ~ AP ~ethylene acryllc acl~?, and B
~llm or sheeting 3 of polye~ter, ~ltably a fllm mar~eted under the name of Mylar ~reg~tered trademark) OL.
The material~ of the ~ray 1, l~d 2 and fllm 3 are heat-~ealable to each other, however, 1f the lld were to ~e heat-sealed (welded) straight onto the tray, it would not;~epossible to remove it from the tray without it belng,d~troyed (torn).
The flgure shows the package ~eing sealed.
After the tray 1 has been f~lled wlth ready-co~ked food, it ~9 placed on a support 4 prov~ded w~th a ru~b~r plate S w~th upwardly oriented edge~ 5a ~urrounding the ba~le of the tray. Th~ can be done manually or by mean~ of a 8ul~able feeding device. A roll 6, on which the film 3 ~8 wou ~ in the form of a band, i~ located over and ad~acent the ~upport 4.
The width of the roll 6 and therefore of the film 3 c,orre-sponds to or i~ slightly wlder than the length of the~ tray 1, i.e. the greate~t di~tance between oppos~te part~ of the edge~
5~ 14: c~ L 1~ ~ROTH ~ C~ 46 8 316767 02 ;~1 )17~49 la. For each tray 1 placed on t~e plate 5, the film 3 18 intended to be advanced immed~ately over or in contact with the tray in the dlrectlon of the arrow a dlstance whlch corre-sponds to or i~ sligntly longer than the width of the tray, by a sultable device not shown ln the ~igure.
The l~d 2 ~ placed, manually or by a device not ~hown, on top of the film 2 exactly over the tray 1. The area of the lid 2 ~9 selected such that the lid will cover the tray open~ng and the entlre edge la.
At a distance over the plate 5 slightly exceedlng the helght of the tray 1 there ~ 8 arrange~ a wel~lng head 7. The head 7 i~ provided with a lower plane surface, the area of whlch corresponds to the area of the lid 2. T~e head 7 is movable toward~ and away from the tray 1 with the fllm 3 and 1~ lid 2 thereon, and lts temperature 18 ~uch that heat-sealing or weldng o~ the fil~ to the tray and of the lid to the f~lm wlll take place when the head i8 briefly pressed against these .
After or ln connectlon wlth the above de~cribed heat-sealinq a sleeve B wit~ a heated, lJpshaped lower edge 8B,whlch ~leeve ~urrounds the welding he~d 7 an~ i8 guided by same, i8 carried downwardly towards the tray 1, whereby the film 3 will melt immediately outslde the lid 2 ~o that the parts of the fSlm ~urrounding the lid wlll be separated from 26 the now flni~hed package, which wlll then be removed from the support 4 e~ther manua}ly or by ~ome suitable feeding-out devlce.
Owlng to the film 3 belng ln~erted between the lid 2 and the tray 1 and owing to the properties ~f the materlal of wh~ch they are made, there is prov~ded a package the content~
of wh~ch can be heated ~n a mlcrowave oven (also with the lld attached), and the top s~de of which can be preprlntsd or provlded wlth prlnt or the llke ln connection wlth ~ealing an~
the 1~ of whlch can ~e removed by the 90 called peel-off ?5 effect, i.e. the film i5 eaBlly removable from the tray wthout the lid gettlng torn or destroyed in some other way.
Although only one embodlment of the lnvent~on has been ... , . .; . ~ . . .
189~-05-30 14: ~4 L R GROTH & CO RB 46 8 316767 03 ~'~17849 de~cribed above and ~hown on the drawlng, it will be under-~tood that the invention i~ not limlted to ~ld embodiment but only by the scope of the claim~.
)i'7849 "DES~RIPTION
Technical field The pre~ent i~ventlon relate~ to a package and a method for sealing $he pac~age. The package comprlse~ a tr~y e~peclally lntended or keep1ng and heating ready-c~o~ed food, and a lld which i~ removable from the tray.
PriQ~ art It iB known to keep and to heat ready-cooked Pood in packages con~isting of a tray provided wlth a lld. it i8 essential that the food ~hould not be affected by the packaging materlal and that the lld should be ea~lly removable from the tray.
A package fulSllllng the8e requlrement~ comp~l~e8 an aluminium tray wlth a cardboard and/or alumin1um llq which ~8 attached to the tray by fol~ing the ed~e~ surroundl~g the opening of the tray inwardly over the lld, and whLch, can be removed therefrom after sald sdges have b en folded ,~way from the lid. Di~adva~tage~ of thls package are that seal~ng ls carried out manually, that the fo~d'cannot ~e heate~!ln~lde the package ln a microwave oven and that the ~eallng wlll not be liquldproof. ,' A package ln which the ~ood can be neated ln a micro-wave oven and whlch can be sealed mechanlcally compr~e~ atray of plastic~ material such as aPET and a lld made of plastic-coated cardboard, which ~ld can be welded ~heat-sealed~ to the edges of the trsy opening. A dlsadv~n,tage o this kind of package iA that the lld i8 dlfflcult to re~ove from the tray and often break~ when beinq removed.
Further, lt i~ ~nown to weld a plastic film to a CPE~
tray. Wit~ thl~ ~$nd of packa~e lt i8 difficult to tear and to remove t~e film without touchln~ the food. Moreover,,it i9 not po~slble to provlde the film with informatlon in tho,form of, for example, advertislny or a text statln~ the contents of the package, and packages of th$a,kind are theFefore often supplied ln cardboard cases provided;~w$t~-" uch infor~ation.-1 ~3gQ-~5-~ 14 ~ L i~ ~ROTH ~ C~l RR 46 8 31 l~i f 6~ 01 ;~)i'7~4 Desc~lption of ~he inv,e,~o,n It 1B an ob~ect of the pre~ent lnventlon to lmprove packages of the above-mentioned klnd and to seal these ln a ~lmple, nonexpen~ive and efflcient way.
Thls o~ect i~ accompl~hed by provldinq the p,ackage of the inventlon with the features tated in the charac!terlzlng portions of the claims.
~e~cr~PtiOn of the fiqure~
The one figure of the drawing 18 a schematic, explodod perspective view showlng sealing of a package accord~ng to the invention.
Preferred embodiment The package according to the ~nvention comprl~s a tray 1 of thermoformed CPET with an opening surrounded by a folded, approximately 5 mm wlde edge which extends roun~ the whole of the tray 1, a l~d 2 of cardboard and pla~t~cq mater~al, suitably a mater~al marketed under the name of Inver,~ote (registered trademark) G ~ AP ~ethylene acryllc acl~?, and B
~llm or sheeting 3 of polye~ter, ~ltably a fllm mar~eted under the name of Mylar ~reg~tered trademark) OL.
The material~ of the ~ray 1, l~d 2 and fllm 3 are heat-~ealable to each other, however, 1f the lld were to ~e heat-sealed (welded) straight onto the tray, it would not;~epossible to remove it from the tray without it belng,d~troyed (torn).
The flgure shows the package ~eing sealed.
After the tray 1 has been f~lled wlth ready-co~ked food, it ~9 placed on a support 4 prov~ded w~th a ru~b~r plate S w~th upwardly oriented edge~ 5a ~urrounding the ba~le of the tray. Th~ can be done manually or by mean~ of a 8ul~able feeding device. A roll 6, on which the film 3 ~8 wou ~ in the form of a band, i~ located over and ad~acent the ~upport 4.
The width of the roll 6 and therefore of the film 3 c,orre-sponds to or i~ slightly wlder than the length of the~ tray 1, i.e. the greate~t di~tance between oppos~te part~ of the edge~
5~ 14: c~ L 1~ ~ROTH ~ C~ 46 8 316767 02 ;~1 )17~49 la. For each tray 1 placed on t~e plate 5, the film 3 18 intended to be advanced immed~ately over or in contact with the tray in the dlrectlon of the arrow a dlstance whlch corre-sponds to or i~ sligntly longer than the width of the tray, by a sultable device not shown ln the ~igure.
The l~d 2 ~ placed, manually or by a device not ~hown, on top of the film 2 exactly over the tray 1. The area of the lid 2 ~9 selected such that the lid will cover the tray open~ng and the entlre edge la.
At a distance over the plate 5 slightly exceedlng the helght of the tray 1 there ~ 8 arrange~ a wel~lng head 7. The head 7 i~ provided with a lower plane surface, the area of whlch corresponds to the area of the lid 2. T~e head 7 is movable toward~ and away from the tray 1 with the fllm 3 and 1~ lid 2 thereon, and lts temperature 18 ~uch that heat-sealing or weldng o~ the fil~ to the tray and of the lid to the f~lm wlll take place when the head i8 briefly pressed against these .
After or ln connectlon wlth the above de~cribed heat-sealinq a sleeve B wit~ a heated, lJpshaped lower edge 8B,whlch ~leeve ~urrounds the welding he~d 7 an~ i8 guided by same, i8 carried downwardly towards the tray 1, whereby the film 3 will melt immediately outslde the lid 2 ~o that the parts of the fSlm ~urrounding the lid wlll be separated from 26 the now flni~hed package, which wlll then be removed from the support 4 e~ther manua}ly or by ~ome suitable feeding-out devlce.
Owlng to the film 3 belng ln~erted between the lid 2 and the tray 1 and owing to the properties ~f the materlal of wh~ch they are made, there is prov~ded a package the content~
of wh~ch can be heated ~n a mlcrowave oven (also with the lld attached), and the top s~de of which can be preprlntsd or provlded wlth prlnt or the llke ln connection wlth ~ealing an~
the 1~ of whlch can ~e removed by the 90 called peel-off ?5 effect, i.e. the film i5 eaBlly removable from the tray wthout the lid gettlng torn or destroyed in some other way.
Although only one embodlment of the lnvent~on has been ... , . .; . ~ . . .
189~-05-30 14: ~4 L R GROTH & CO RB 46 8 316767 03 ~'~17849 de~cribed above and ~hown on the drawlng, it will be under-~tood that the invention i~ not limlted to ~ld embodiment but only by the scope of the claim~.
Claims (4)
1 A package especially for keeping and heating of ready-cooked food, comprising a tray having an opening and being made of plastics material, a removable lid made of at least one of cardboard and plastics material, a plastic film, the area which is at least as large as that of the lid, the plastic film belong heat-sealed to the lid and to the edge surrounding the opening of the tray, the lid and plastic film being removable from said edge without the lid and the tray being destroyed.
2 A package according to claim 1, in which the tray is made of thermoformed CPET and the plastic film is made of polyester.
3 A method for sealing a package comprising a tray and a lid, the tray being made of plastics material and especially intended for keeping of ready-cooked food and healing of same in a microwave oven, and the lid being made of cardboard and/or plastics material, wherein a) the tray with contents is placed on a support, b) a plastic film, the area of which is larger than that of the tray opening, is placed over the tray, c) the lid, the area of which is larger than that of the tray opening, is placed on top of the plastic film, d) the plastic film is welded to the tray and the lid is welded to the plastic film in one and the same operation.
4 A method according to claim 3, wherein the area of the plastic film is essentially larger than that of the lid when the plastic film is placed over the tray and is given substan-tially the same length-width dimension as the lid in connec-tion with its being welded to the tray.
A method according to claim 4, wherein the plastic film in the form of a band is advanced to a position over the tray in which the plastic film is given substantially the same length-width dimension as the lid through separation by means of heat.
A method according to claim 4, wherein the plastic film in the form of a band is advanced to a position over the tray in which the plastic film is given substantially the same length-width dimension as the lid through separation by means of heat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2017849 CA2017849A1 (en) | 1990-05-30 | 1990-05-30 | Package and a method for sealing the package |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2017849 CA2017849A1 (en) | 1990-05-30 | 1990-05-30 | Package and a method for sealing the package |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2017849A1 true CA2017849A1 (en) | 1991-11-30 |
Family
ID=4145099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2017849 Abandoned CA2017849A1 (en) | 1990-05-30 | 1990-05-30 | Package and a method for sealing the package |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2017849A1 (en) |
-
1990
- 1990-05-30 CA CA 2017849 patent/CA2017849A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |