CA2099940A1 - Tear tape - Google Patents
Tear tapeInfo
- Publication number
- CA2099940A1 CA2099940A1 CA 2099940 CA2099940A CA2099940A1 CA 2099940 A1 CA2099940 A1 CA 2099940A1 CA 2099940 CA2099940 CA 2099940 CA 2099940 A CA2099940 A CA 2099940A CA 2099940 A1 CA2099940 A1 CA 2099940A1
- Authority
- CA
- Canada
- Prior art keywords
- tear tape
- overwrap
- package
- coating layer
- overwrap 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
Abstract
TEAR TAPE
ABSTRACT OF THE DISCLOSURE
A package includes a paper stock inner layer together with an overwrap of a transparent, tearable polypropylene which is wrapped around the paper stock and heat sealed at seams to provide a moisture impermeable covering for the paper stock package. A tear tape is positioned between the paper stock and the overwrap so that an end tab of the tear tape can be pulled to cause a tear line in the overwrap material. The tear tape is bonded by an adhesive to the inside surface of the overwrap and includes an end tab portion projecting through the seam. The tear tape is formed from polyester but carries on its inside surface a thin layer of a material for example acrylic or PVDC which is compatible with the polypropylene overwrap to form a heat seal therewith while being free from bonding to the paper stock. This prevents moisture loss from the package through the seam at the area of the end pull tab of the tear tape.
ABSTRACT OF THE DISCLOSURE
A package includes a paper stock inner layer together with an overwrap of a transparent, tearable polypropylene which is wrapped around the paper stock and heat sealed at seams to provide a moisture impermeable covering for the paper stock package. A tear tape is positioned between the paper stock and the overwrap so that an end tab of the tear tape can be pulled to cause a tear line in the overwrap material. The tear tape is bonded by an adhesive to the inside surface of the overwrap and includes an end tab portion projecting through the seam. The tear tape is formed from polyester but carries on its inside surface a thin layer of a material for example acrylic or PVDC which is compatible with the polypropylene overwrap to form a heat seal therewith while being free from bonding to the paper stock. This prevents moisture loss from the package through the seam at the area of the end pull tab of the tear tape.
Description
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TEAR TAPE
FIELD OF THE INVENTION
This invention relates to a tear tape, to a package when wrapped with an overwrap material carrying the tear tape and to a method of wrapping a package.
It has become common practice in recent years to wrap a package in a transparent overwrap material which is folded around the package body to provide seams of the overlapped wrapping material generally along the edges of the package body which are then bonded together to enclose the package body. Some such packages are sensitive to moisture loss and in order to maximize shelf life the overwrap material is bonded in a manner, generally by heat sealing, that provides a moisture impermeable seal at the seams around the package. In this way the overwrap material can be effectively moisture impermeable to prevent the deterioration which can occur from the moisture loss.
It is also highly desirable for customer satisfaction to provide a tear tape which allows the overwrap material to be torn and therefore readily removed in a simple tearing action. The tear tape comprises a narrow tape body which is attached by a bead of adhesive to the inside surface of the overwrap material so that the tear tape extends around the package body with an end tab portion of the tear tape exposed through one seam of the overwrap material to allow that end tab portion to be manually grasped and pulled. The tear tape body is formed of a material which has sufficient strength in a longitudinal direction to allow the pulling action to tear the overwrap material in a tear line following the tear tape thus dividing the overwrap material into two separate portions which can be readily removed from the package.
TEAR TAPE
FIELD OF THE INVENTION
This invention relates to a tear tape, to a package when wrapped with an overwrap material carrying the tear tape and to a method of wrapping a package.
It has become common practice in recent years to wrap a package in a transparent overwrap material which is folded around the package body to provide seams of the overlapped wrapping material generally along the edges of the package body which are then bonded together to enclose the package body. Some such packages are sensitive to moisture loss and in order to maximize shelf life the overwrap material is bonded in a manner, generally by heat sealing, that provides a moisture impermeable seal at the seams around the package. In this way the overwrap material can be effectively moisture impermeable to prevent the deterioration which can occur from the moisture loss.
It is also highly desirable for customer satisfaction to provide a tear tape which allows the overwrap material to be torn and therefore readily removed in a simple tearing action. The tear tape comprises a narrow tape body which is attached by a bead of adhesive to the inside surface of the overwrap material so that the tear tape extends around the package body with an end tab portion of the tear tape exposed through one seam of the overwrap material to allow that end tab portion to be manually grasped and pulled. The tear tape body is formed of a material which has sufficient strength in a longitudinal direction to allow the pulling action to tear the overwrap material in a tear line following the tear tape thus dividing the overwrap material into two separate portions which can be readily removed from the package.
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The adhesive on the outer surface of the tear tape ensures an adequate bonding effect of the outer surface of the tear tape to the inner surface of the overwrap material. However it is not in any way possible to provide an adhesive material on the inside surface of the tear tape since this would otherwise bond to the package thus reducing the effectiveness of the tear tape to tear the overwrap material and more importantly tending to tear away the outer surface of the package itself which is totally unacceptable.
SUMMARY OF THE INVENTION
It is one object of the present invention, therefore to provide an improved tear tape construction, an improved resultant wrapped package using the tear tape construction and an improved method of wrapping a package.
According to the first aspect of the invention there is provided a wrapped package comprising a package body, an overwrap material formed of a transparent, tearable plastics material having an inner surface wrapped around the body to fully enclose the body with an outer surface of the overwrap material exposed outwardly of the body, the overwrap material being folded to form overlapping seams of the overwrap material along the package body, the overwrap material at the overlapping seams being bonded together to prevent moisture loss through the seams, a tear tape, adhesive means on an outer surface of the tear tape adhesively attaching the tear tape to the inner surface of the overwrap material, the tear tape being wrapped around the package body with an inside surface thereof in contact with the package body and having an end tab portion of the tear tape projecting through a seam of the overwrap material to allow manual grasping of the tear tape, the tear tape having longitudinal strength sufficient to enable it when pulled to tear the overwrap material to allow 3 2~99~.~
unwrapping of the package body, the tear tape being formed of a plastics material dissimilar from the overwrap material such that the plas.ics material of the tear tape is not heat bondable to the overwrap material and having a heat sealable coating layer on the inside surface of the plastics material of the tear tape, which heat sealable coating layer is not bonded to the package body and is heat bonded to the overwrap material so as to provide a bonded seal between the inside surface of the end tab portion and the overwrap material at said seam to prevent moisture loss between the inside surface of the tear tape and the overwrap material.
According to a second aspect of the invention there is provided a tear tape for application to an overwrapping sheet material for wrapping a package body, the tear tape comprising an elongate tape body formed of a plastics material having a longitudinal strength sufficient to enable it when pulled to tear the overwrap material to allow unwrapping of the package body, the tear tape body being formed from polyester and having on one surface thereof a layer of a material which is non-adhesive, is heat bondable to polypropylene and is not heat bondable to paper.
According to a third aspect of the invention there is provided method of wrapping a package comprising providing a package body, wrapping around the body an overwrap material formed of a transparent, tearable plastics material so as to define an inner surface wrapped around the body to fully enclose the body and an outer surface of the overwrap material exposed outwardly of the body, folding the overwrap material to form overlapping seams of the overwrap material along the package body, bonding the overwrap material at the overlapping seams together to prevent moisture loss through the seams, providing a tear tape having adhesive means on an outer surface of the tear tape, adhesively attaching 2 ~ 3 the tear tape to the inner surface of the overwrap material, wrapping the tear tape around the package body with an inside surface thereof in contact with the package body and having an end tab portion of the tear tape projecting through a seam of the overwrap material to allow manual grasping of the tear tape, the tear tape having longitudinal strength sufficient to enable it when pulled to tear the overwrap material to allow unwrapping of the package body, the tear tape being formed of a plastics material dissimilar from the overwrap material such that the plastics material of the tear tape is not heat bondable to the overwrap material and having a heat sealable coating layer on the inside surface of the plastics material of the tear tape, which heat sealable coating layer is not bonded to the package body, and heat bonding the heat sealable coating layer to the overwrap material so as to provide a bonded seal between the inside surface of the end tab portion and the overwrap material at said seam to prevent moisture loss between the inside surface of the tear tape and the overwrap material.
Generally, therefore, the tear tape which is conventionally formed of polyester and which is preferably biaxially oriented is supplemented by the provision of a layer on the inside surface of the tear tape body which is compatible with the overwrap material to allow a heat actuated bonding effect in the heat sealing process. This ensures a seal between the inside surface of the tear tape at the end tab portion and the adjacent portion of the overwrap material to complete the seal of the overwrap material around the package to further reduce moisture loss.
Preferably the overwrap material is formed of polypropylene which may itself have a covering layer of acrylic or maybe doped in order to improve the heat sealing characteristics.
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The heat sealable coating layer applied to the inner surface only of the polyester tear tape can itself comprise an acrylic material or a PVDC
material. Preferably the material is of a nature which flows at a temperature in the range 200 to 300F so that it is readily heat sealable and is compatible with the material of the overwrap. Such a layer can have a thickness less than 0.0002 inches (0.005mm) since the material is provided simply to give the required heat sealing characteristics and has no effect on the structural strength of the tear tape.
The layer can be applied as a coating for example as a water based material applied after the formation of the base sheet from which the tear tapes are slit, or can be coextruded with the base sheet. In the latter case, the thickness will be generally a little greater.
One embodiment of the invention will now be described in conjunction with the accompanying drawings in which:
DESCRIPTION OF THE DRAWINGS
Figure 1 is an isometric view of a package according to the present invention.
Figure 2 is a cross sectional view on an enlarged scale showing schematically the layers of the packaging material including the package body, the tear tape and the overwrap material, the cross section being taken along the lines 2-2 of Figure 1.
Figure 3 is a similar cross sectional view showing the package body, the tear tape and the overwrap material taken along the lines 3-3 of Figure 1.
In the drawings like characters of reference indicate corresponding parts in the different figures.
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DETAILED DESCRIPTION
The package of the present invention is shown in Figures 1, 2 and 3 and is illustrated in one example as a cigarette package including an outer package body formed of a paper material and indicated at 10. On the paper material is printed the necessary information including logos 11 and 12. The construction of the folded paper package is conventional and therefore will not be described in detail herein.
Around the paper package body is wrapped a layer of an overwrap material 14 which comprises a transparent, tearable plastics film which is generally but not exclusively of polypropylene which has the desirable characteristics of moisture impermeability, tearability, clear transparency and sufficient strength to resist abrasion or impact damage.
The overwrap material is wrapped around the package and folded at fold lines so as to shape the material to encompass the whole of the package with seams 14C one of which is visible along one side edge of the package.
The seams are provided by an overlapping of two layers 14A and 14B of the overwrap material which are heat sealed together by the application of heat and pressure to provide a complete circumferential seal around the seams so that the whole of the package is fully enveloped by the moisture impermeable material.
A tear tape 15 is wrapped around the package between the package and the overwrap to allow tearing of the overwrap at the line defined by the tear tape for unwrapping and removal of the overwrap.
The tear tape 15 includes a tape body 16 formed of a suitable plastics material to provide the required longitudinal strength to effect the tearing action. Preferably the tear tape body 16 is formed from polyester which is biaxially oriented which has been found to provide the required ,.=~
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degree of strength and other characteristics such as the ability to print indicia on the layer and the ability of the material to be wound into a cylindrical package of the material. In one example the thickness of the polyester material may lie in the range 0.00048 to .002 inches and the width of the tape body will be of the order of 1.6 to 10 mm and more preferably 2 to 5 mm.
The tape body 16 includes an outer surface 17 and an inner surface 18. As shown in Figure 3 at the majority of the periphery of the package, the inside surface 18 lies adjacent or in contact with the package material 10. The outer surface 17 carries an adhesive layer 19 which acts to bond the outer surface of the tear tape body to the inner surface of the overwrap material. Preferably the adhesive layer 19 is of a hot melt type which is applied to the overwrap film on line with the packaging process so that it is applied to the overwrap film as the overwrap film is led to the packaging system and hence remains in the adhesive condition at the time that the tear tape is brought into contact with the overwrap material. As an alternative, however, the adhesive material may be of the pressure sensitive type.
On the outer surface 17 of the tape body is applied a layer of printed indicia 20 which is applied to the surface 17 prior to the application of the adhesive 19. The adhesive is sufficiently transparent that the indicia are visible through the adhesive layer and through the overwrap material as shown in Figure 1. On the underside 18 of the tape body 16 is provided an additional layer 22 which is a heat sealable coating layer and forms an integral part of the tape body and is carried thereby. The additional layer 22 covers the whole of the lower surface 18 but is not applied to the surface 17 of the tape body. The layer 22 is formed from a material which has the 2~9~g ability to flow under application of heat to a temperature in the range 200 to 300F. The layer may be formed of an acrylic material, PVDC material or some other suitable bondable layer either as a coextrusion with the tape body or as a subsequently applied coating. The thickness of the layer is very thin since it provides no structural strength to the tape but simply is provided in order to cooperate with the overwrap material in providing a seal.
The layer 22 is therefore non-adhesive so that it does not in any way adhere to the paper stock 10 in the area where it is an engagement with that paper stock so that there is no bonding between the tear tape and the paper stock which could cause tearing.
However the layer is arranged to be compatible with the overwrap material so that it engages the layer 14B in the seam area and is heat sealed to the layer 14B by the conventional heat sealing process which seals the layer 14A to the layer 14B of the overwrap material. Thus the heat seal extends around the full periphery around the seam without any break in the seal at the underside of the tear tape.
Thus as shown in Figure 1, the conventional end pull tab 25 of the tear tape projects through the seam between the layers 14A and 14B to be exposed on the outside of the overwrap to be grasped and pulled in the tearing action.
Since various modifications can be made in my invention as herein above described, and many apparently widely different embodiments of same made within the spirit and scope of the claims without departing from such spirit and scope, it is intended that all matter contained in the accompanying specification shall be interpreted as illustrative only and not in a limiting sense.
The adhesive on the outer surface of the tear tape ensures an adequate bonding effect of the outer surface of the tear tape to the inner surface of the overwrap material. However it is not in any way possible to provide an adhesive material on the inside surface of the tear tape since this would otherwise bond to the package thus reducing the effectiveness of the tear tape to tear the overwrap material and more importantly tending to tear away the outer surface of the package itself which is totally unacceptable.
SUMMARY OF THE INVENTION
It is one object of the present invention, therefore to provide an improved tear tape construction, an improved resultant wrapped package using the tear tape construction and an improved method of wrapping a package.
According to the first aspect of the invention there is provided a wrapped package comprising a package body, an overwrap material formed of a transparent, tearable plastics material having an inner surface wrapped around the body to fully enclose the body with an outer surface of the overwrap material exposed outwardly of the body, the overwrap material being folded to form overlapping seams of the overwrap material along the package body, the overwrap material at the overlapping seams being bonded together to prevent moisture loss through the seams, a tear tape, adhesive means on an outer surface of the tear tape adhesively attaching the tear tape to the inner surface of the overwrap material, the tear tape being wrapped around the package body with an inside surface thereof in contact with the package body and having an end tab portion of the tear tape projecting through a seam of the overwrap material to allow manual grasping of the tear tape, the tear tape having longitudinal strength sufficient to enable it when pulled to tear the overwrap material to allow 3 2~99~.~
unwrapping of the package body, the tear tape being formed of a plastics material dissimilar from the overwrap material such that the plas.ics material of the tear tape is not heat bondable to the overwrap material and having a heat sealable coating layer on the inside surface of the plastics material of the tear tape, which heat sealable coating layer is not bonded to the package body and is heat bonded to the overwrap material so as to provide a bonded seal between the inside surface of the end tab portion and the overwrap material at said seam to prevent moisture loss between the inside surface of the tear tape and the overwrap material.
According to a second aspect of the invention there is provided a tear tape for application to an overwrapping sheet material for wrapping a package body, the tear tape comprising an elongate tape body formed of a plastics material having a longitudinal strength sufficient to enable it when pulled to tear the overwrap material to allow unwrapping of the package body, the tear tape body being formed from polyester and having on one surface thereof a layer of a material which is non-adhesive, is heat bondable to polypropylene and is not heat bondable to paper.
According to a third aspect of the invention there is provided method of wrapping a package comprising providing a package body, wrapping around the body an overwrap material formed of a transparent, tearable plastics material so as to define an inner surface wrapped around the body to fully enclose the body and an outer surface of the overwrap material exposed outwardly of the body, folding the overwrap material to form overlapping seams of the overwrap material along the package body, bonding the overwrap material at the overlapping seams together to prevent moisture loss through the seams, providing a tear tape having adhesive means on an outer surface of the tear tape, adhesively attaching 2 ~ 3 the tear tape to the inner surface of the overwrap material, wrapping the tear tape around the package body with an inside surface thereof in contact with the package body and having an end tab portion of the tear tape projecting through a seam of the overwrap material to allow manual grasping of the tear tape, the tear tape having longitudinal strength sufficient to enable it when pulled to tear the overwrap material to allow unwrapping of the package body, the tear tape being formed of a plastics material dissimilar from the overwrap material such that the plastics material of the tear tape is not heat bondable to the overwrap material and having a heat sealable coating layer on the inside surface of the plastics material of the tear tape, which heat sealable coating layer is not bonded to the package body, and heat bonding the heat sealable coating layer to the overwrap material so as to provide a bonded seal between the inside surface of the end tab portion and the overwrap material at said seam to prevent moisture loss between the inside surface of the tear tape and the overwrap material.
Generally, therefore, the tear tape which is conventionally formed of polyester and which is preferably biaxially oriented is supplemented by the provision of a layer on the inside surface of the tear tape body which is compatible with the overwrap material to allow a heat actuated bonding effect in the heat sealing process. This ensures a seal between the inside surface of the tear tape at the end tab portion and the adjacent portion of the overwrap material to complete the seal of the overwrap material around the package to further reduce moisture loss.
Preferably the overwrap material is formed of polypropylene which may itself have a covering layer of acrylic or maybe doped in order to improve the heat sealing characteristics.
2~99~
The heat sealable coating layer applied to the inner surface only of the polyester tear tape can itself comprise an acrylic material or a PVDC
material. Preferably the material is of a nature which flows at a temperature in the range 200 to 300F so that it is readily heat sealable and is compatible with the material of the overwrap. Such a layer can have a thickness less than 0.0002 inches (0.005mm) since the material is provided simply to give the required heat sealing characteristics and has no effect on the structural strength of the tear tape.
The layer can be applied as a coating for example as a water based material applied after the formation of the base sheet from which the tear tapes are slit, or can be coextruded with the base sheet. In the latter case, the thickness will be generally a little greater.
One embodiment of the invention will now be described in conjunction with the accompanying drawings in which:
DESCRIPTION OF THE DRAWINGS
Figure 1 is an isometric view of a package according to the present invention.
Figure 2 is a cross sectional view on an enlarged scale showing schematically the layers of the packaging material including the package body, the tear tape and the overwrap material, the cross section being taken along the lines 2-2 of Figure 1.
Figure 3 is a similar cross sectional view showing the package body, the tear tape and the overwrap material taken along the lines 3-3 of Figure 1.
In the drawings like characters of reference indicate corresponding parts in the different figures.
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DETAILED DESCRIPTION
The package of the present invention is shown in Figures 1, 2 and 3 and is illustrated in one example as a cigarette package including an outer package body formed of a paper material and indicated at 10. On the paper material is printed the necessary information including logos 11 and 12. The construction of the folded paper package is conventional and therefore will not be described in detail herein.
Around the paper package body is wrapped a layer of an overwrap material 14 which comprises a transparent, tearable plastics film which is generally but not exclusively of polypropylene which has the desirable characteristics of moisture impermeability, tearability, clear transparency and sufficient strength to resist abrasion or impact damage.
The overwrap material is wrapped around the package and folded at fold lines so as to shape the material to encompass the whole of the package with seams 14C one of which is visible along one side edge of the package.
The seams are provided by an overlapping of two layers 14A and 14B of the overwrap material which are heat sealed together by the application of heat and pressure to provide a complete circumferential seal around the seams so that the whole of the package is fully enveloped by the moisture impermeable material.
A tear tape 15 is wrapped around the package between the package and the overwrap to allow tearing of the overwrap at the line defined by the tear tape for unwrapping and removal of the overwrap.
The tear tape 15 includes a tape body 16 formed of a suitable plastics material to provide the required longitudinal strength to effect the tearing action. Preferably the tear tape body 16 is formed from polyester which is biaxially oriented which has been found to provide the required ,.=~
2~399~Q
degree of strength and other characteristics such as the ability to print indicia on the layer and the ability of the material to be wound into a cylindrical package of the material. In one example the thickness of the polyester material may lie in the range 0.00048 to .002 inches and the width of the tape body will be of the order of 1.6 to 10 mm and more preferably 2 to 5 mm.
The tape body 16 includes an outer surface 17 and an inner surface 18. As shown in Figure 3 at the majority of the periphery of the package, the inside surface 18 lies adjacent or in contact with the package material 10. The outer surface 17 carries an adhesive layer 19 which acts to bond the outer surface of the tear tape body to the inner surface of the overwrap material. Preferably the adhesive layer 19 is of a hot melt type which is applied to the overwrap film on line with the packaging process so that it is applied to the overwrap film as the overwrap film is led to the packaging system and hence remains in the adhesive condition at the time that the tear tape is brought into contact with the overwrap material. As an alternative, however, the adhesive material may be of the pressure sensitive type.
On the outer surface 17 of the tape body is applied a layer of printed indicia 20 which is applied to the surface 17 prior to the application of the adhesive 19. The adhesive is sufficiently transparent that the indicia are visible through the adhesive layer and through the overwrap material as shown in Figure 1. On the underside 18 of the tape body 16 is provided an additional layer 22 which is a heat sealable coating layer and forms an integral part of the tape body and is carried thereby. The additional layer 22 covers the whole of the lower surface 18 but is not applied to the surface 17 of the tape body. The layer 22 is formed from a material which has the 2~9~g ability to flow under application of heat to a temperature in the range 200 to 300F. The layer may be formed of an acrylic material, PVDC material or some other suitable bondable layer either as a coextrusion with the tape body or as a subsequently applied coating. The thickness of the layer is very thin since it provides no structural strength to the tape but simply is provided in order to cooperate with the overwrap material in providing a seal.
The layer 22 is therefore non-adhesive so that it does not in any way adhere to the paper stock 10 in the area where it is an engagement with that paper stock so that there is no bonding between the tear tape and the paper stock which could cause tearing.
However the layer is arranged to be compatible with the overwrap material so that it engages the layer 14B in the seam area and is heat sealed to the layer 14B by the conventional heat sealing process which seals the layer 14A to the layer 14B of the overwrap material. Thus the heat seal extends around the full periphery around the seam without any break in the seal at the underside of the tear tape.
Thus as shown in Figure 1, the conventional end pull tab 25 of the tear tape projects through the seam between the layers 14A and 14B to be exposed on the outside of the overwrap to be grasped and pulled in the tearing action.
Since various modifications can be made in my invention as herein above described, and many apparently widely different embodiments of same made within the spirit and scope of the claims without departing from such spirit and scope, it is intended that all matter contained in the accompanying specification shall be interpreted as illustrative only and not in a limiting sense.
Claims (28)
1. A wrapped package comprising a package body, an overwrap material formed of a transparent, tearable plastics material having an inner surface wrapped around the body to fully enclose the body with an outer surface of the overwrap material exposed outwardly of the body, the overwrap material being folded to form overlapping seams of the overwrap material along the package body, the overwrap material at the overlapping seams being bonded together to prevent moisture loss through the seams, a tear tape, adhesive means on an outer surface of the tear tape adhesively attaching the tear tape to the inner surface of the overwrap material, the tear tape being wrapped around the package body with an inside surface thereof in contact with the package body and having an end tab portion of the tear tape projecting through a seam of the overwrap material to allow manual grasping of the tear tape, the tear tape having longitudinal strength sufficient to enable it when pulled to tear the overwrap material to allow unwrapping of the package body, the tear tape being formed of a plastics material dissimilar from the overwrap material such that the plastics material of the tear tape is not heat bondable to the overwrap material and having a heat sealable coating layer on the inside surface of the plastics material of the tear tape, which heat sealable coating layer is not bonded to the package body and is heat bonded to the overwrap material so as to provide a bonded seal between the inside surface of the end tab portion and the overwrap material at said seam to prevent moisture loss between the inside surface of the tear tape and the overwrap material.
2. The package according to Claim 1 wherein the plastics material of the tear tape is polyester.
3. The package according to Claim 2 wherein the heat sealable coating layer is provided on the inside surface only of the tear tape.
4. The package according to Claim 1,2 or 3 wherein the overwrap material is formed from polypropylene and wherein the heat sealable coating layer is of a characteristic such that it is heat bondable to the overwrap material.
5. The package according to Claim 1,2 or 3 wherein the heat sealable coating layer is an acrylic material.
6. The package according to Claim 1, 2 or 3 wherein the heat sealable coating layer is a PVDC material.
7. The package according to Claim 1, 2 or 3 wherein the heat sealable coating layer is formed of a material which flows at a temperature in the range 200°F to 300°F.
8. The package according to Claim 1, 2 or 3 wherein the tear tape has a layer of printed indicia on the outer surface thereof.
9. The package according to Claim 1, 2 or 3 wherein the thickness of the heat sealable coating layer is less than 0.0002 inch.
10. The package according to Claim 1, 2 or 3 wherein the plastics material of the tear tape is biaxially oriented polyester.
11. A tear tape for application to an overwrapping sheet material for wrapping a package body, the tear tape comprising an elongate tape body formed of a plastics material having a longitudinal strength sufficient to enable it when pulled to tear the overwrap material to allow unwrapping of the package body, the tear tape body being formed from polyester and having on one surface thereof a plastics layer of a material which is non-adhesive, is heat bondable to polypropylene and is not heat bondable to paper.
12. The tear tape according to Claim 11 wherein the plastics coating layer is provided on the inside surface only of the tear tape.
13. The tear tape according to Claim 11 wherein the plastics layer is of a characteristic such as it is heat bondable to polypropylene.
14. The tear tape according to Claim 11, 12 or 13 wherein the plastics coating layer is an acrylic material.
15. The tear tape according to Claim 11, 12 or 13 wherein the plastics coating layer is a PVDC material.
16. The tear tape according to Claim 11, 12 or 13 wherein the plastics coating material is formed of a material which flows at a temperature in the range 200°F to 300°F.
17. The tear tape according to Claim 11, 12 or 13 wherein the tear tape has a layer of printed indicia on the outer surface thereof.
18. The tear tape according to Claim 1 1, 12 or 13 wherein the thickness of the plastics layer is less than 0.0002 inch.
19. A method of wrapping a package comprising providing a package body, wrapping around the body an overwrap material formed of a transparent, tearable plastics material so as to define an inner surface wrapped around the body to fully enclose the body and an outer surface of the overwrap material exposed outwardly of the body, folding the overwrap material to form overlapping seams of the overwrap material along the package body, bonding the overwrap material at the overlapping seams together to prevent moisture loss through the seams, providing a tear tape having adhesive means on an outer surface of the tear tape, adhesively attaching the tear tape to the inner surface of the overwrap material, wrapping the tear tape around the package body with an inside surface thereof in contact with the package body and having an end tab portion of the tear tape projecting through a seam of the overwrap material to allow manual grasping of the tear tape, the tear tape having longitudinal strength sufficient to enable it when pulled to tear the overwrap material to allow unwrapping of the package body, the tear tape being formed of a plastics material dissimilar from the overwrap material such that the plastics material of the tear tape is not heat bondable to the overwrap material and having a heat sealable coating layer on the inside surface of the plastics material of the tear tape, which heat sealable coating layer is not bonded to the package body, and heat bonding the heat sealable coating layer to the overwrap material so as to provide a bonded seal between the inside surface of the end tab portion and the overwrap material at said seam to prevent moisture loss between the inside surface of the tear tape and the overwrap material.
20. The method according to Claim 19 wherein the plastics material of the tear tape is polyester.
21. The method according to Claim 20 wherein the heat sealable coating layer is provided on the inside surface only of the tear tape.
22. The method according to Claim 19 wherein the overwrap material is formed from polypropylene and wherein the heat sealable coating layer is of a characteristic such that it is heat bondable to the overwrap material.
23. The method according to Claim 19 wherein the heat sealable coating layer is an acrylic material.
24. The method according to Claim 19 wherein the heat sealable coating layer is a PVDC material.
25. The method according to Claim 19 wherein the heat sealable coating layer is formed of a material which flows at a temperature in the range 200°F to 300°F.
26. The method according to Claim 19 wherein the tear tape has a layer of printed indicia on the outer surface thereof.
27. The method according to Claim 19 wherein the thickness of the heat sealable coating layer is less than 0.0002 inch.
28. The method according to Claim 19 wherein the plastics material of the tear tape is biaxially oriented polyester.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US90958392A | 1992-07-06 | 1992-07-06 | |
| US909,583 | 1992-07-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2099940A1 true CA2099940A1 (en) | 1994-01-07 |
Family
ID=25427499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2099940 Abandoned CA2099940A1 (en) | 1992-07-06 | 1993-07-06 | Tear tape |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2099940A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5806281A (en) * | 1996-05-31 | 1998-09-15 | Kt Industries Inc. | Tear tape adapted for complete sealing of package overwrap |
| US7828150B2 (en) | 2000-06-21 | 2010-11-09 | Glaxosmithkline Llc | Container for medicament powder |
| CN105416764A (en) * | 2015-11-25 | 2016-03-23 | 王辉 | Pull ring label for ring-pull can |
| US9555955B2 (en) | 2010-03-15 | 2017-01-31 | Wm. Wrigley Jr. Company | Package assembly |
-
1993
- 1993-07-06 CA CA 2099940 patent/CA2099940A1/en not_active Abandoned
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5806281A (en) * | 1996-05-31 | 1998-09-15 | Kt Industries Inc. | Tear tape adapted for complete sealing of package overwrap |
| US7828150B2 (en) | 2000-06-21 | 2010-11-09 | Glaxosmithkline Llc | Container for medicament powder |
| US9555955B2 (en) | 2010-03-15 | 2017-01-31 | Wm. Wrigley Jr. Company | Package assembly |
| CN105416764A (en) * | 2015-11-25 | 2016-03-23 | 王辉 | Pull ring label for ring-pull can |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |