EP0860371A1 - Packaging material - Google Patents
Packaging material Download PDFInfo
- Publication number
- EP0860371A1 EP0860371A1 EP98300605A EP98300605A EP0860371A1 EP 0860371 A1 EP0860371 A1 EP 0860371A1 EP 98300605 A EP98300605 A EP 98300605A EP 98300605 A EP98300605 A EP 98300605A EP 0860371 A1 EP0860371 A1 EP 0860371A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- strip
- packaging material
- coated
- cohesive
- 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.)
- Ceased
Links
Images
Classifications
-
- 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
- B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
- B65D5/42—Details of containers or of foldable or erectable container blanks
- B65D5/54—Lines of weakness to facilitate opening of container or dividing it into separate parts by cutting or tearing
-
- 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
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
- B65D65/403—Applications of laminates for particular packaging purposes with at least one corrugated layer
-
- 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
- B65D75/52—Details
- B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
- B65D75/5827—Tear-lines provided in a wall portion
- B65D75/5833—Tear-lines provided in a wall portion for tearing out a portion of the wall
- B65D75/5844—Tear-lines provided in a wall portion for tearing out a portion of the wall the portion of the wall being a narrow strip, e.g. between lines of weakness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/74—Auxiliary operations
- B31B50/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
Definitions
- This invention relates to packaging material, to a process for its production and to a packaged article comprising the packaging material.
- the invention relates to packaging material comprising a corrugated sheet of paper coated with a cohesive composition.
- Packaging material based on a corrugated sheet of paper coated with a cohesive composition is well-known and an example of such a product is the material sold by the applicant under the trade mark Cushionwrap R .
- the cohesive composition causes the paper to form an adhesive bond between coated sides but to form substantially no adhesive bond between a coated side and an uncoated side or another surface.
- Cohesive compositions are well-known in the art and are disclosed in, for example, GB 1458812 and EP-A-0656442.
- the packaging material generally includes a relatively thick sheet of corrugated paper backed with a sheet of liner paper and this can be difficult to tear, particularly when tightly wrapped around a packaged article.
- zip strip can be two parallel lines of perforation through the packaging material which allows the package to be opened with greater ease by tearing along the lines of perforation.
- a tear tape is generally a tape of a different material from that of the package and facilitates opening of the package by being pulled through, or away from, the package.
- US 4778059 and US 5098747 describe shipping cartons made from conventional double faced corrugated board.
- the cartons include a tear tape of a different material adhered to the inside of the carton which aids in tearing open the carton.
- the opened cartons are intended to form a tray to display the products which are packaged in the cartons.
- GB-A-2233316 also relates to cartons which, when opened, form trays for the packaged product.
- the cartons are made of double faced corrugated board and include two parallel lines of perforation to allow them to be opened more easily.
- US 5464151 discloses a container made of double faced corrugated board and incorporating a tear tape which is adhered to the inside of the container. Perforations provide a line of weakness for the tear tape but do not pass through the entire thickness of the board in order to avoid weakening the unopened container.
- the present invention aims to make packages formed from packaging material of the type based on corrugated paper coated with a cohesive composition more easily openable. This is achieved by perforating the material through a strip of paper which is applied directly to the coated side of the corrugated sheet.
- the present invention provides packaging material comprising a sheet of corrugated paper coated on at least one side with a cohesive composition and a strip adhered to a coated side of the sheet, perforations being present through the strip and the underlying sheet to provide a line of weakness to facilitate opening of the packaging material by tearing.
- the invention also provides a packaged article comprising the packaging material of the invention.
- the packaging material may be wrapped around the article.
- the packaging material is a single faced corrugated material having a cohesive coating on one side of the sheet and a backing liner on the other side.
- the backing liner will generally be of paper and the perforations which pass through the sheet and the strip preferably also pass through this liner.
- the strip is preferably adhered to the sheet by interaction between the cohesive coating on the sheet and a cohesive coating on the strip. This has the advantage of avoiding the need for a separate adhesive system for the strip and overcomes the problem of adhering the strip to the sheet when it is coated with the cohesive composition.
- the perforations are preferably in the form of two substantially parallel lines of cuts through the packaging material.
- the perforations may extend along the length of the strip.
- the lines are 2 to 3 cm apart and are spaced at a distance of about 1 to 2 cm in from the edges of the strip.
- the strip is of paper so that the packaging material remains predominantly paper based to ensure that it is recyclable.
- paper is intended to cover all interlaced fibrous products such as are derived from cellulosic materials.
- the corrugated sheet is of wet-strengthened paper and the strip and the liner, when present, are of kraft paper.
- the cohesive composition can be any composition which, when coated onto a substrate (such as, for example, paper), causes the coated substrate to bind strongly to other coated substrates but to form little or no adhesive bond to uncoated surfaces.
- a substrate such as, for example, paper
- Suitable compositions are well-known in the art and may be based on rubber, either natural, modified or synthetic.
- the composition may be applied to the sheet in the form of a latex of the rubber.
- the packaging material of the invention is conveniently produced by bonding the strip to the corrugated sheet by means of a cohesive composition and then perforating the resulting laminate. Therefore, in another embodiment, the present invention provides a process for producing the packaging material which comprises coating a strip with a cohesive composition, applying the coated strip to a sheet of corrugated paper coated with a cohesive composition so as to form an adhesive bond between the strip and the sheet and perforating the resulting laminate through the strip and the underlying sheet.
- sheet of packaging material 1 is a laminate comprising a corrugated sheet 2 which is coated on its uppermost face (as depicted in Figure 1) with a cohesive composition.
- a backing liner sheet 3 is adhesively bonded to the underside of the corrugated sheet 2 by a conventional adhesive system, for example a starch-based adhesive.
- Strip 4 runs across corrugated sheet 2 and is adhesively bonded to it by means of a cohesive composition on strip 4 which adheres to the cohesive composition on corrugated sheet 2.
- strip 4 is first coated on one side with a cohesive composition (preferably the same composition as is coated on corrugated sheet 2) and then applied to the coated side of corrugated sheet 2.
- Strip 4 has two series of perforations 5 which extend along the length of the strip. The perforations 5 are in the form of cuts, but could be holes or other shapes punched through the strip, and extend through both the corrugated sheet 2 and the backing liner sheet 3.
- Figure 2 illustrates the underside of the packaging material of Figure 1 (showing backing liner sheet 3). Perforations 5 extend along the backing liner sheet 3.
- packaging material 1 When packaging material 1 is used to package an article (such as, for example, a book), the article is placed on the uppermost side of the packaging material 1, as shown in Figure 1 i.e., the side which has the coated corrugated surface provided by corrugated sheet 2 and the strip 4.
- the packaging material is wrapped around the article by bringing different parts of the coated sheet 2 into contact, thus forming an adhesive bond between the cohesive coated surfaces and producing a package around the article.
- the backing liner sheet 3 forms the outside of the package with perforations 5 visible.
- the package is opened by tearing along perforations 5 and, as the packaging material 1 is torn, strip 4 provides reinforcement to keep the tear moving along perforations 5 rather than deviating away from the perforations 5 and into the unperforated corrugated sheet 2 and backing liner sheet 3.
- the packaging material of the invention can be used in all applications for which the conventional products based on corrugated paper coated with a cohesive composition are appropriate and, by virtue of the deformability of the corrugated sheet, can cushion the packaged articles against damage in the same way.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wrappers (AREA)
Abstract
Packaging material comprises a sheet of corrugated paper (2,3)
coated on at least one side with a cohesive composition and a strip (4)
adhered to a coated side of the sheet (2,3). The strip (4) and the sheet (2,3) are
perforated to provide a line of weakness (5) which facilitates opening of
the packaging material by tearing.
Description
This invention relates to packaging material, to a process for its production and to a packaged article comprising the packaging material. In particular, the invention relates to packaging material comprising a corrugated sheet of paper coated with a cohesive composition.
Packaging material based on a corrugated sheet of paper
coated with a cohesive composition is well-known and an example of
such a product is the material sold by the applicant under the trade
mark CushionwrapR. The cohesive composition causes the paper to
form an adhesive bond between coated sides but to form
substantially no adhesive bond between a coated side and an
uncoated side or another surface. Cohesive compositions are well-known
in the art and are disclosed in, for example, GB 1458812 and
EP-A-0656442.
A problem with packaging materials of the type mentioned
above is that packages made from them can be difficult to open.
The packaging material generally includes a relatively thick sheet of
corrugated paper backed with a sheet of liner paper and this can be
difficult to tear, particularly when tightly wrapped around a packaged
article.
It is known that the opening of packages can be facilitated by
incorporating a so-called "zip strip" or "tear tape" into the package.
The zip strip can be two parallel lines of perforation through the
packaging material which allows the package to be opened with
greater ease by tearing along the lines of perforation. A tear tape is
generally a tape of a different material from that of the package and
facilitates opening of the package by being pulled through, or away
from, the package.
US 4778059 and US 5098747 describe shipping cartons
made from conventional double faced corrugated board. The cartons
include a tear tape of a different material adhered to the inside of the
carton which aids in tearing open the carton. The opened cartons
are intended to form a tray to display the products which are
packaged in the cartons.
GB-A-2233316 also relates to cartons which, when opened,
form trays for the packaged product. The cartons are made of
double faced corrugated board and include two parallel lines of
perforation to allow them to be opened more easily.
US 5464151 discloses a container made of double faced
corrugated board and incorporating a tear tape which is adhered to
the inside of the container. Perforations provide a line of weakness
for the tear tape but do not pass through the entire thickness of the
board in order to avoid weakening the unopened container.
None of the prior art documents teaches anything about
facilitating the opening of single faced cardboard packaging.
The present invention aims to make packages formed from
packaging material of the type based on corrugated paper coated
with a cohesive composition more easily openable. This is achieved
by perforating the material through a strip of paper which is applied
directly to the coated side of the corrugated sheet.
Accordingly, the present invention provides packaging material
comprising a sheet of corrugated paper coated on at least one side
with a cohesive composition and a strip adhered to a coated side of
the sheet, perforations being present through the strip and the
underlying sheet to provide a line of weakness to facilitate opening
of the packaging material by tearing. The invention also provides a
packaged article comprising the packaging material of the invention.
The packaging material may be wrapped around the article.
Surprisingly, it has been found that it is possible to adhere the
strip directly to the corrugated sheet (rather than to a backing liner
on the sheet) without adversely affecting the way in which the tear
propagates along the perforations. In spite of being adhered to a
corrugated sheet, which is by definition non-uniform, the tear line
follows the perforations rather than deviating through the
corrugations in the sheet.
Preferably, the packaging material is a single faced corrugated
material having a cohesive coating on one side of the sheet and a
backing liner on the other side. The backing liner will generally be of
paper and the perforations which pass through the sheet and the
strip preferably also pass through this liner.
The strip is preferably adhered to the sheet by interaction
between the cohesive coating on the sheet and a cohesive coating
on the strip. This has the advantage of avoiding the need for a
separate adhesive system for the strip and overcomes the problem of
adhering the strip to the sheet when it is coated with the cohesive
composition.
The perforations are preferably in the form of two substantially
parallel lines of cuts through the packaging material. The
perforations may extend along the length of the strip. Suitably, the
lines are 2 to 3 cm apart and are spaced at a distance of about 1 to
2 cm in from the edges of the strip.
It is preferred that the strip is of paper so that the packaging
material remains predominantly paper based to ensure that it is
recyclable. The term "paper", as used herein, is intended to cover all
interlaced fibrous products such as are derived from cellulosic
materials. Preferably, the corrugated sheet is of wet-strengthened
paper and the strip and the liner, when present, are of kraft paper.
The cohesive composition can be any composition which,
when coated onto a substrate (such as, for example, paper), causes
the coated substrate to bind strongly to other coated substrates but
to form little or no adhesive bond to uncoated surfaces. Suitable
compositions are well-known in the art and may be based on rubber,
either natural, modified or synthetic. The composition may be
applied to the sheet in the form of a latex of the rubber.
The packaging material of the invention is conveniently
produced by bonding the strip to the corrugated sheet by means of a
cohesive composition and then perforating the resulting laminate.
Therefore, in another embodiment, the present invention provides a
process for producing the packaging material which comprises
coating a strip with a cohesive composition, applying the coated strip
to a sheet of corrugated paper coated with a cohesive composition
so as to form an adhesive bond between the strip and the sheet and
perforating the resulting laminate through the strip and the
underlying sheet.
The invention will now be described, by way of example only,
with reference to the accompanying drawings, wherein:
In Figure 1, sheet of packaging material 1 is a laminate
comprising a corrugated sheet 2 which is coated on its uppermost
face (as depicted in Figure 1) with a cohesive composition. A
backing liner sheet 3 is adhesively bonded to the underside of the
corrugated sheet 2 by a conventional adhesive system, for example a
starch-based adhesive. Strip 4 runs across corrugated sheet 2 and is
adhesively bonded to it by means of a cohesive composition on strip
4 which adheres to the cohesive composition on corrugated sheet 2.
Thus, in order to adhere strip 4 to corrugated sheet 2, strip 4 is first
coated on one side with a cohesive composition (preferably the same
composition as is coated on corrugated sheet 2) and then applied to
the coated side of corrugated sheet 2. Strip 4 has two series of
perforations 5 which extend along the length of the strip. The
perforations 5 are in the form of cuts, but could be holes or other
shapes punched through the strip, and extend through both the
corrugated sheet 2 and the backing liner sheet 3.
Figure 2 illustrates the underside of the packaging material of
Figure 1 (showing backing liner sheet 3). Perforations 5 extend
along the backing liner sheet 3.
When packaging material 1 is used to package an article (such
as, for example, a book), the article is placed on the uppermost side
of the packaging material 1, as shown in Figure 1 i.e., the side which
has the coated corrugated surface provided by corrugated sheet 2
and the strip 4. The packaging material is wrapped around the
article by bringing different parts of the coated sheet 2 into contact,
thus forming an adhesive bond between the cohesive coated
surfaces and producing a package around the article. Once
packaged, the backing liner sheet 3 forms the outside of the package
with perforations 5 visible. The package is opened by tearing along
perforations 5 and, as the packaging material 1 is torn, strip 4
provides reinforcement to keep the tear moving along perforations 5
rather than deviating away from the perforations 5 and into the
unperforated corrugated sheet 2 and backing liner sheet 3.
The packaging material of the invention can be used in all
applications for which the conventional products based on
corrugated paper coated with a cohesive composition are appropriate
and, by virtue of the deformability of the corrugated sheet, can
cushion the packaged articles against damage in the same way.
Claims (8)
- Packaging material comprising a sheet of corrugated paper coated on at least one side with a cohesive composition and a strip adhered to a coated side of the sheet, perforations being present through the strip and the underlying sheet to provide a line of weakness to facilitate opening of the packaging material by tearing.
- Packaging material as claimed in claim 1 which is a single faced corrugated material having a cohesive coating on one side of the sheet and a backing liner on the other side.
- Packaging material as claimed in claim 1 or claim 2, wherein the strip is adhered to the sheet by interaction between the cohesive coating on the sheet and a cohesive coating on the strip.
- Packaging material as claimed in any one of claims 1 to 3, wherein the perforations are in the form of two substantially parallel lines of perforation.
- Packaging material as claimed in any one of claims 1 to 4, wherein the strip is of paper.
- Packaging material as claimed in any one of claims 1 to 5, wherein the cohesive composition is based on rubber.
- Packaged article comprising the packaging material of any one of claims 1 to 6.
- Process for producing the packaging material of any one of claims 1 to 6 comprising coating a strip with a cohesive composition, applying the coated strip to a sheet of corrugated paper coated with a cohesive composition so as to form an adhesive bond between the strip and the sheet and perforating the resulting laminate through the strip and the underlying sheet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9703746A GB2322349B (en) | 1997-02-22 | 1997-02-22 | Packaging material |
| GB9703746 | 1997-02-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0860371A1 true EP0860371A1 (en) | 1998-08-26 |
Family
ID=10808168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98300605A Ceased EP0860371A1 (en) | 1997-02-22 | 1998-01-28 | Packaging material |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0860371A1 (en) |
| DE (1) | DE860371T1 (en) |
| GB (1) | GB2322349B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0968929A1 (en) * | 1998-07-03 | 2000-01-05 | Carrs Paper Limited | Wrapping materials |
| WO2001030659A1 (en) | 1999-10-26 | 2001-05-03 | Unilever Plc | Divisible multi-carton package |
| EP2454999A1 (en) * | 2010-11-17 | 2012-05-23 | Jürgen Rathenberg | Receiving device for stool samples with detachable attached sections and method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2833404A (en) * | 1956-03-09 | 1958-05-06 | Gen Foods Corp | Shipping bundle or package |
| US3203618A (en) * | 1963-10-28 | 1965-08-31 | St Regis Paper Co | Shipping wrapper |
| DE2846008A1 (en) * | 1978-10-23 | 1980-05-08 | Depro Design & Production Gmbh | Packing carton with tear-open closure - has perforation lines in sidewall covered by plastics film having corresponding tear-open tape |
| WO1992002424A1 (en) * | 1990-08-03 | 1992-02-20 | St. Regis Packaging Limited | Improved packaging carton and blank therefor |
| US5568877A (en) * | 1994-09-19 | 1996-10-29 | Boise Cascade Corporation | Method of manufacture for container for hot food |
| JPH08310525A (en) * | 1995-05-17 | 1996-11-26 | Asahi Kakoshi Kk | Corrugated board box and production thereof |
| US5704481A (en) * | 1994-11-18 | 1998-01-06 | Ivex Corporation | Easy open package |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5135790A (en) * | 1987-02-11 | 1992-08-04 | H. B. Fuller Company | Tear tape opening system |
| GB9324873D0 (en) * | 1993-12-03 | 1994-01-19 | British Sisalkraft | Packaging material |
-
1997
- 1997-02-22 GB GB9703746A patent/GB2322349B/en not_active Expired - Fee Related
-
1998
- 1998-01-28 DE DE0860371T patent/DE860371T1/en active Pending
- 1998-01-28 EP EP98300605A patent/EP0860371A1/en not_active Ceased
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2833404A (en) * | 1956-03-09 | 1958-05-06 | Gen Foods Corp | Shipping bundle or package |
| US3203618A (en) * | 1963-10-28 | 1965-08-31 | St Regis Paper Co | Shipping wrapper |
| DE2846008A1 (en) * | 1978-10-23 | 1980-05-08 | Depro Design & Production Gmbh | Packing carton with tear-open closure - has perforation lines in sidewall covered by plastics film having corresponding tear-open tape |
| WO1992002424A1 (en) * | 1990-08-03 | 1992-02-20 | St. Regis Packaging Limited | Improved packaging carton and blank therefor |
| US5568877A (en) * | 1994-09-19 | 1996-10-29 | Boise Cascade Corporation | Method of manufacture for container for hot food |
| US5704481A (en) * | 1994-11-18 | 1998-01-06 | Ivex Corporation | Easy open package |
| JPH08310525A (en) * | 1995-05-17 | 1996-11-26 | Asahi Kakoshi Kk | Corrugated board box and production thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0968929A1 (en) * | 1998-07-03 | 2000-01-05 | Carrs Paper Limited | Wrapping materials |
| WO2001030659A1 (en) | 1999-10-26 | 2001-05-03 | Unilever Plc | Divisible multi-carton package |
| EP2454999A1 (en) * | 2010-11-17 | 2012-05-23 | Jürgen Rathenberg | Receiving device for stool samples with detachable attached sections and method |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9703746D0 (en) | 1997-04-09 |
| DE860371T1 (en) | 1999-02-25 |
| GB2322349A (en) | 1998-08-26 |
| GB2322349B (en) | 2000-06-21 |
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