U.S. patent application number 09/736512 was filed with the patent office on 2001-05-10 for film tape for forming a cutting edge on dispenser cartons.
Invention is credited to Catterlin, Richard G., Drapala, Wieslaw A., Foubert, Roland A., Williams, Kimberly J..
Application Number | 20010000902 09/736512 |
Document ID | / |
Family ID | 22549634 |
Filed Date | 2001-05-10 |
United States Patent
Application |
20010000902 |
Kind Code |
A1 |
Foubert, Roland A. ; et
al. |
May 10, 2001 |
Film tape for forming a cutting edge on dispenser cartons
Abstract
A tape formed of a polymeric material and having a thickness and
stiffness suitable as a cutting edge on a dispensing carton for
convolutely wound foil, film or paper, the tape includes a coating
of adhesive and is applied at a laminating station in the carton
manufacturing process and is generally cut with the forming of the
carton blanks, and the cut in the tape may be formed with a
serrated edge.
Inventors: |
Foubert, Roland A.;
(Vancouver, WA) ; Drapala, Wieslaw A.; (Vancouver,
WA) ; Williams, Kimberly J.; (Vancouver, WA) ;
Catterlin, Richard G.; (Vancouver, WA) |
Correspondence
Address: |
H.B. FULLER CO.
3450 LA BORE RD.
VADNAIS HEIGHTS
MN
55110
US
|
Family ID: |
22549634 |
Appl. No.: |
09/736512 |
Filed: |
December 13, 2000 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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09736512 |
Dec 13, 2000 |
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09154005 |
Sep 16, 1998 |
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Current U.S.
Class: |
225/43 ; 225/48;
493/51; 493/56 |
Current CPC
Class: |
Y10T 156/1087 20150115;
C09J 2431/00 20130101; C09J 7/255 20180101; Y10T 156/1322 20150115;
C08L 31/04 20130101; C09J 7/22 20180101; C09J 2467/006 20130101;
C09J 7/35 20180101; C09J 2423/006 20130101; Y10T 225/10 20150401;
Y10T 225/249 20150401; C09J 7/241 20180101; B65H 35/008 20130101;
Y10T 156/1067 20150115; Y10T 156/1744 20150115; Y10T 225/243
20150401; Y10T 156/1317 20150115; Y10T 225/248 20150401; B65D
83/0882 20130101 |
Class at
Publication: |
225/43 ; 225/48;
493/51; 493/56 |
International
Class: |
B26F 003/02; B65H
035/10 |
Claims
What is claimed is:
1. An adhesive tape for use as a cutter bar for dispensing cartons,
said adhesive tape comprising: a) a backing of between about 2 mils
(0.05 mm) to about 7 mils (0.18 mm) in thickness comprised of a
polymeric film material selected from the group consisting of
polyester, polypropylene and polyethylene, and b) said backing
having opposite edges, and opposite sides, one of said sides being
coated with an adhesive having high adhesion to a fiber board for
forming dispensing cartons.
2. The tape of claim 1 wherein one edge of the tape is formed with
a saw-toothed edge.
3. The dispensing carton of claim 1 wherein said cutting edge is a
straight edge.
4. The tape of claim 1 wherein said adhesive is selected from the
group consisting of heat activated hot melt adhesives and hot melt
pressure sensitive adhesives.
5. The tape of claim 4 wherein said adhesive is an EVA based hot
melt adhesive.
6. The tape of claim 5 wherein said backing is corona treated.
7. A method of forming a cutting edge on a dispensing carton for
film, foil or paper comprising the steps of: a) forming a tape
having a polymeric backing coated with an adhesive on one side, b)
supplying a roll of said tape to the application station in a box
forming machine, c) applying the tape to the carton board in the
box forming machine and laminating the same, and d) cutting the
carton board into carton blanks and the tape lengthwise to form a
cutting edge on each blank.
8. The method of claim 7 wherein the method includes the step of
die cutting the carton board and the tape to form a serrated edge
in the tape adhered to the carton board.
9. The method of claim 7 wherein the method includes the step of
cutting the tape backing to form a serrated edge along an edge of
the tape.
10. The method of claim 7 wherein the tape comprises a backing
formed of a polymeric material selected from the group consisting
of polyester, polyethylene and polypropylene.
11. The method according to claim 10 wherein the adhesive comprises
an EVA hot melt adhesive.
12. The tape of claim 1 wherein said backing is heat resistant
between about 160.degree. F. (71.degree. C.) and about 350.degree.
F. (177.degree. C.).
13. The method according to claim 11 wherein said backing is corona
treated.
14. A dispensing carton for use in dispensing foil, paper and film
comprising: a) a front panel, a bottom panel, a rear panel, each
having panels at opposite ends to form the ends of the carton; b) a
lid connected to the rear panel and a flange joined to the lid to
overlap said front panel; and c) a cutting edge formed on one of
said front panel and said flange joined to said lid for severing
lengths of material dispensed from said carton, said cutting edge
formed of a polymeric material selected from the group comprising
polyester, polypropylene and polyethylene and having a thickness
between 2 mils (0.05 mm) and 7 mils (0.18 mm) and adhered to said
one of said panel and flange by adhesive.
15. The dispensing carton of claim 14 wherein the adhesive
comprises an EVA hot melt adhesive.
16. The dispensing carton of claim 14 wherein the polymeric
material backing is heat resistant between about 160.degree. F.
(71.degree. C.) and about 350.degree. F. (177.degree. C.).
17. The dispensing carton of claim 14 wherein said cutting edge has
a serrated edge.
18. The dispensing carton of claim 14 wherein the cutting edge
projects above the edge of the front panel.
19. The dispensing carton of claim 14 wherein said backing is
corona treated.
20. The dispensing carton of claim 14 wherein said cutting edge is
a straight edge.
Description
BACKGROUND OF THE INVENTION
1. 1. Field of the Invention
2. This invention relates to a novel tape for forming a cutting
edge on cartons or boxes for convolutely wound rolls of film, paper
or foil products, and in one aspect to a new method for applying a
cutting edge in-line with the printing or sheeting station of the
carton manufacturing machine. The cutting edge is formed of a
polymeric material adhered to the carton for cutting lengths of
material from a roll in the carton.
3. 2. Description of the Prior Art
4. The prior art is replete with teachings of using a rectangular
dispensing carton for a roll of sheet material, which material is
intended to be dispensed and severed in the desired length from the
carton by the consumer. The cartons generally have a cutter on an
edge of the front panel or on the lid to aid in cutting the
material. The cutter is formed with a saw-toothed edge to guide the
cut across the width of the sheet material.
5. The saw-toothed or serrated cutting edge has been typically
formed of a metal (EP 352634 A dated 19900131, U.S. Pat. No.
5,078,311) or from the carton paper or board impregnated with resin
(WO 9635574 A2), or by reinforcing a paper carton with plastic or
vulcanized fiber materials with an ultrasonic fusion member (JP
8309890 A dated 19950522). U.S. Pat. No. 4,405,066 discloses a flip
top dispenser carton of the type related to the present invention
wherein the invention relates to the flaps forming the ends of the
carton. It also teaches that the longitudinally extending free edge
of the outer panel is straight and is provided with a plastic
reinforcing strip. The patent teaches the combination of a straight
edge 40 and the reinforcing strip 42 provides a rigid cutting
surface for tearing heavier rolls of film such as wax paper and
aluminum foil. The reinforcing plastic is applied to adjacent
blanks which are contiguous, such that a single cut, defining the
free edges of both blanks simultaneously forms the side edges of
both plastic strips, producing a cutting edge at lower cost than
the metal saw-tooth blades.
6. The present invention differs from the prior art in that the
present invention compares a film tape coated with an adhesive for
continuous application to a carton fiber board or to the blank to
form a resulting reinforced cutting edge on the lid flap or front
panel of a carton. The tape is applied to the carton board during
the normal box making process. The tape is formed of a polymeric
material which is strong enough to serve the numerous cutting
operations on the material dispensed from the ultimate carton but
not as sharp or likely to cause injury to the consumer as the
current methods.
SUMMARY OF THE INVENTION
7. The present invention provides a new film tape coated with
adhesive for application to the carton board of a carton for a
convolutely wound roll of sheet material in which the tape serves
as the cutting edge on the carton for the material. The tape is
formed of a polymeric film material in a continuous strip which is
stiff enough, when applied to the free edge of a carton to provide
the cutting function. The exposed edge may be a straight or a
serrated edge. Further, the tape of the present invention reduces
the number of stations used in the carton forming machine to apply
the cutting edge. The application of a metal cutting edge requires
the application station and a station for riveting or stapling the
metal to the blank. The method of the present invention requires a
laminating step or station in-line with the printing or sheeting
station to apply the tape before the blanks are cut or separated.
If the tape is applied to blanks placed in mirror-image to each
other, the tape is applied to both blanks simultaneously and the
tape is then cut lengthwise to form the cutting edge on each blank
and to separate the blanks.
BRIEF DESCRIPTION OF THE DRAWING
8. The present invention will be further described with reference
to the accompanying drawing wherein:
9. FIG. 1 is a perspective view of a roll of the tape material of
the present invention:
10. FIG. 2 is a schematic view of the application of the tape to a
sheet of fiber board moving through the box forming machine;
11. FIG. 3 is a plan schematic view of the tape applied to the
fiber board and then cut into mirrored pairs of box blanks with the
tape applied and cut on center to separate the box blanks before
the folding station;
12. FIG. 4 is a perspective view of a dispenser carton showing the
cutting tape applied along the top edge of the front panel forming
the cutting edge, and
13. FIG. 5 is a detail view showing the tape applied to two carton
blanks and cut to form a saw-tooth or serrated edge.
DESCRIPTION OF THE PREFERRED EMBODIMENT
14. The present invention provides a polymeric tape for forming the
cutting edge on a rectangular dispensing carton or box for
polymeric wrapping film, waxed or other paper, or metal wrapping
foil.
15. Referring now to the drawing, the tape 6 comprises a polymeric
backing 8 coated with an adhesive 9, preferably a hot melt
adhesive. The tape 6 is transversely or convolutely wound to
provide a continuous supply of tape to a carton making machine such
that it can be applied in-line at a laminating station. The
laminating station is in-line with the printing or sheeting station
of the carton forming machine.
16. FIG. 2 schematically illustrates the application of the tape 6
to a carton board 20 as it is advanced through the carton
manufacturing machine in the machine direction. The tape 6 passes
over a feed or idler roller 21 to an applying roller 22 and under a
pressure or laminating roller 23. One or both of the rollers 22 and
23 can be heated to apply a tape 6 coated with a hot melt adhesive
9. Beyond the laminating station is the die cutting station 25
which die cuts the carton blanks from the carton board 20 and cuts
the tape 6 to length on the blank and down the middle to separate
two carton blanks, see FIG. 3.
17. The carton 10 normally includes a front panel 11, a bottom
panel 12, a rear panel 14, and a lid 15, which is hingedly joined
to the rear panel 14, and a closing flap 16, joined to the free
edge of the lid 15, to cover a portion of the front panel 11.
Flanges 17 on the ends of the front, bottom and rear panels form
the ends 18 of the carton 10, and as illustrated the lid 15 can be
formed with a flange 19, which is torn away from the ends of the
lid 15 upon opening the carton 10. The carton 10 is rectangular,
having a length considerably greater than its width to support a
roll of sheet material, i.e., clingfilm, paper or foil, not shown.
Typically a cutter blade is riveted to the upper edge of the front
panel 11 or to the free edge of the closing flap 16. In the present
invention the cutter bar 30 is formed by the polymeric tape 6
bonded to the upper free edge of the front panel 11. The cutter bar
30 has a straight edge projecting just above but generally parallel
with the top edge of the front panel over which the material is
drawn and then torn across the cutter edge. The tape forming the
cutter bar can also be cut so as to form a saw-toothed or serrated
free edge to aid in cutting the sheet material.
18. As shown in schematic form in FIG. 5, the tape is applied to
blanks in contiguous manner, but spaced between the adjacent edges
formed to support the cutting bar 30. When the tape is applied to
the two moving blanks it is registered with the moving blanks and
laminated as explained above. The tape is then cut and in this
manner it can be cut to project just above the edge of the front
panel 11 or the flap 16 on the lid. As illustrated the tape is cut
to have a saw-toothed edge. Alternatively, the tape 6 can be formed
to be applied to individual blanks and formed with a straight or
serrated edge.
19. In the present invention, the tape 6 comprises a film backing 8
and an adhesive 9. The film backing is formed of polyester,
polypropylene, polyethylene or similar polymeric material having
sufficient strength to support the cutting function, and preferably
polyester. The backing is heat resistant between about
160.degree.F. (71.degree. C.) and about 350.degree. F. (177.degree.
C.), preferably at least 250.degree. F. (125.degree. C.). The
backing 8 has a thickness between 2 mils (0.05 mm) and 7 mils (0.18
mm), preferably 4 mils (0.1 mm), with a width of 0.25 inch (0.60
cm) to 1.25 inches (3.2 cm), and preferably the cutting edge on the
carton is 0.25 inch (0.60 cm) in width. If the tape is applied to
blanks placed in mirror images to each other, a wider tape is
preferred, preferably twice as wide as that used as the cutting
edge on each blank.
20. The adhesive 9 exhibits high adhesion characteristics to the
film backing and the carton board such that it maintains a good
bond under the normal wear and tear exerted on the carton. A
preferred adhesive formulation is:
1 Wt-% Material Available From 20.0 AC 830 Allied Signal, Inc.,
Morristown, NJ 4.0 Be Square 195 Bareco Products, Rock Hill, SC
28.0 Unitac R99 Union Camp Corporation, Jacksonville, FL 12.0
Norsolene A110 Sartomer Company, Exton, PA 0.50 Lenox 10 Alphachem
International Corp., Lake Oswego, Or. 10.0 AT2820 AT Plastics
Edmonton, Alberta Canada 25.5 Elvaloy HP771 Dupont, Wilmington,
DE
21. Alternatively, for a properly treated film, the adhesive 9 can
be any available hot melt adhesive that exhibits high adhesion
characteristics to carton board. When other hot melt adhesives are
used, the tape backing is preferably corona treated to improve
adhesion of the adhesive to the backing. Other means of improving
the adhesion can also be used, such as treating the backing with
adhesion promoters.
22. Available hot melts for the adhesive 9 can be any typical hot
melt adhesive or hot melt pressure-sensitive adhesive such as an
ethylene-vinyl acetate copolymer (EVA-based) hot melt adhesive; a
metallocene based hot melt pressure-sensitive adhesive such as
those comprising at least one homogeneous linear or substantially
linear interpolymer of ethylene and at least one C.sub.3 to
C.sub.20 alpha-olefin; EMA-based hot melt and hot melt
pressure-sensitive adhesive (ethylene methylacrylate); EnBA-based
hot melt adhesive (ethylene n-butyl acrylate); hot melt adhesives
based on polyethylene and polypropylene homopolymers, copolymers
and interpolymers, or rubbery block copolymer hot melt adhesives.
In general, if EVA-based hot melt adhesives are used, they
typically comprise about 15% to about 40% EVA, about 10% to about
35% wax, about 20% to about 40% resin, and about 0.2% to about 0.4%
anti-oxidant. These adhesives exhibit high adhesion characteristics
to the carton board, and the backings 8 can be treated to improve
its adhesion to the adhesives.
23. It is surprising that even though the tape is relatively thin,
it performs as a very good cutting edge, especially when the tape
projects just above the panel.
24. The tape is used in the carton manufacturing process to be
applied to the carton material as the same moves through the carton
forming machine in the machine direction. The tape is applied at
one station in the process to laminate the adhesive coated surface
against the carton board and is then cut to form a cutting edge
along the edge of the front panel or the closing flap on the lid.
The tape may be cut to form a straight edge or a serrated edge.
Alternatively, the tape is cut to form serrations along one edge
during the manufacture of the rolls of tape. The application of the
cutting edge tape takes place at one station and after a registered
amount of tape is dispensed, registered and laminated to the carton
board adjacent the edge of the carton board forming the free upper
edge of the front panel, it is cut from the roll.
25. For the embodiment where the cutting edge extends beyond the
edge of the front panel of the carton, whether the edge is straight
or serrated, the adhesive is coated on the backing such that the
exposed edge is free of adhesive, if the adhesive used is
pressure-sensitive. If the adhesive us becomes cured after
application, then the adhesive can be present on the exposed edge
as well.
26. The adhesive thickness ranges from a coating weight of about 3
to about 10 g/sq ft (g/929 cm.sup.2), preferably of about 3.3 to
about 4 g/sq ft. (g/929 cm.sup.2).
27. An alternative way of using the tape to form a cutting
mechanism is to apply the tape to carton board that will be cut
into a single rectangular shape that can act as an insert into the
box that holds the roll of film to be cut. A wide tape can be used
so that the inserts can be made in a mirror image and the tape can
be cut down the center with 1/2 ending up on each insert. The top
edge of the insert can be either a straight edge or a serrated
pattern. Alternatively the tape can be applied along the edge of
the carton board so that it extends above the edge of the carton
board when the insert is cut out, providing a sharper surface
against which to tear the film to be cut.
28. Inserts produced in the method described above can be inserted
as cutting mechanisms into dispensing cartons made of carton board
or larger institutional dispensing boxes made of corrugated.
29. When the tape is used in a fashion such that it extends above
the edge of the carton board, the tape can be manufactured so that
only 1/2of the surface is coated with adhesive. This would assure
that the surface of tape that extends above the carton board is
free of adhesive on both sides.
30. Having disclosed the present invention and equivalents thereof,
it is to be understood that other changes can be made therein
without departing from the spirit and scope of the invention
claimed in the appended claims.
* * * * *