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Publication numberUS3810813 A
Publication typeGrant
Publication dateMay 14, 1974
Filing dateJul 20, 1972
Priority dateJul 20, 1972
Publication numberUS 3810813 A, US 3810813A, US-A-3810813, US3810813 A, US3810813A
InventorsG Ellis
Original AssigneeSesame Industries Ltd
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Closure-forming strip with an attached tear strip structure
US 3810813 A
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Description  (OCR text may contain errors)

May 14, 1974 G. ELLIS CLOSURE-FORMING STRIP WITH AN ATTACHED TEAR STRIP STRUCTURE Filed July 20, 1972 United States Patent Office US. Cl. 161-145 1 Claim ABSTRACT OF THE DISCLOSURE The invention resides in a tear strip structure wherein a conventional closure-forming strip gummed on one side has a tear tape adhesively bonded to the gummed side of the strip. The tear tape occupies a minor medial longitudinal section of the strip and is not adhesive at room temperature or when moistened.

Gummed tape is widely used in effecting closure of various types of packages, such as paperboard and corrugated paperboard cartons and the like. Conventional tapes of this nature are usually formed of kraft paper having one side coated with a water-sensitive or a pressure sensitive adhesive.

In opening such packaged cartons, it is necessary to slit or tear the tape along the joint between the closure flaps of the carton so that the flaps can be engaged at the joint and swung open. Usually, a knife or like cutting instrument is used to slit the tape.

The present invention seeks to provide a tape slitting means incorporated in the structure of conventional gummed strips whereby such strip may be readily severed or slit along its medial longitudinal section.

The invention comprises an elongated strip which may be of paper having a water-sensitive, pressure sensitive or heat sensitive adhesive coating on one side, and a tear tape both side surfaces of which are non-adhesive when moistened or subjected to temperatures of the order of room temperature adhesively bonded to the adhesive coated surface of the strip. The tear tape is located substantially midway between the side edges of the strip and has a width of minor degree with respect to the strip. Thus, there is a minor normally non-adhesive medial section in the longitudinal direction of the completed structure bounded on each side by a marginal Water-sensitive adhesive section.

The invention will be described with reference to the accompanying drawing, in which FIG. 1 is a plan view of a tape structure in accordance with the invention,

FIG. 2 is a section on line 2-2 of FIG. 1,

FIG. 3 is a cross-section of a tape suitable for use in the structure, and

FIG. 4 is a diagrammatic elevation of a machine for forming the structure of the invention.

Referring to FIGS. 1 and 2, is a gummed strip, which may be of conventional form such as a kraft paper strip 11 having a layer 12 of water-sensitive adhesive on one side thereof. It will be understood that this adhesive layer is stable at room temperature and requires to be moistened to render it adhesive.

It is also understood that with slight modifications a pressure-sensitive or a heat-sensitive adhesive could be used in place of the water-sensitive adhesive.

3,810,813 Patented May 14, 1974 Superimposed on and adhesively bonded to the adhesive layer 12 is a tear tape 13. While the tape 13 may be of any suitable construction, it is preferably of greater tensile strength than that of the strip 10. It is positioned on the mid longitudinal section of the strip and extends substantially from end to end thereof. Its width is but a minor portion of the overall width of the strip. In the modification shown, it is about one-third of the overall width. Moreover, it has a thickness which is preferably substantially less than that of the strip.

A suitable tear tape has been found to be that disclosed in FIG. 3. This tape, as shown, comprises two layers 14 and 15. Layer 14 comprises a plurality of elongated fibrous threads or strands or filaments 16, which may be of cotton, rayon, polyester, polyamide, or other synthetic man made or natural fibers, films, or strands. They are embedded in a synthetic resin material 17, such as polymerized vinyl chloride, cellulose acetate, methyl methacrylate, polystyrene, hot-melt adhesive compositions, and the like.

Layer 15 consists of a hot-melt adhesive, which may be of the same or different composition as that of material 17, bonded adhesively to layer 14. Layers 14 and 15 are both stable at ambient temperatures; that is, neither is of tacky or adhesive nature at such temperatures but, in some cases, layer 15 may be of a composition that becomes tacky and adhesive at a higher temperature at which layer 14 remains thermally stable. More specifically, layer 15 may be heated to a temperature exceeding about 60 C. to render it tacky and adhesive but within a range of, say, about 60 C.- C., in which latter range layer 14 may be thermally stable.

It will be apparent, therefore, that if heat is applied to layer 14 in sufiicient degree to soften layer 15, the tape may then be applied to the gummed side of strip 10 with softened layer 15 in engagement therewith. On subsequent cooling, the tape becomes firmly bonded to the strip.

In order to make the tear tape conveniently available for use in the finished article, it is proposed to sever any desired length in such manner that a pull tab 18 consisting of an end portion of the tape and underlying strip is formed. A cutter of the profile indicated may be employed although other suitable profiles may be employed. Thus, the other end portion of succeeding lengths of strip structure will have a complementary notch 27 formed therein, which will not affect the efiectiveness of the structure to any noticeable degree.

In use, a suitable length of tape structure, as shown in FIG. 1, is employed to unite the closure flaps of a carton or the like. Since the tape 13 is readily visible and may have substantial width, it is easy to apply in such manner that the tape bridges the joint between the closure flaps in the closed position thereof. Since the exposed surface of tape 13 is not adhesively joined to the carton, the tab 18 may be conveniently grasped when the carton is to be opened and the length of tape 13 pulled from the carton, thus freeing the closure flaps for swinging into open position.

Referring to FIG. 4, a suitable arrangement is shown for producing the structure of the invention. A supply roll 19 of gummed strip 10 is provided for dispensing a portion thereof as indicated at 20. A supply roll 21 of tape 13 is provided for dispersing a portion thereof indicated at 22. Portion 22 is led over a guide roll 23 into engagement with the periphery of a heated roll 24, the layer 14 of the tape being in contact with the roll. The now pressure sensitive side 15 of the tape is immediately applied to the gummed surface of the strip portion 20 under the influence of a pressure roll 25. Desired lengths of tape are severed by means of a cutting device 26.

"It will be understood that a supply of the assembled strip 10 and tape 13 may be produced by simply omitting the cutter 26 which may later be employed to form desired lengths thereof.

I claim:

1. Tear strip structure comprising an elongated strip having an adhesive coating on one side thereof, and a tear tape adhesively bonded to one side of said elongated strip, longitudinally thereof and substantially midway between the side edges thereof, said tear tape consisting of a body of hot-melt adhesive composition having a plurality of UNITED STATES PATENTS 2,307,406 1/1943 Howard 161-145 X 2,895,865 7/ 1959 Humphner 229-51 AS X 3,504,844 4/1970 Stark et a1. 206-59 C X 3,396,900 8/1968 Lucas 229-51 AS PHILIP DIER, Primary Examiner US. Cl. X.R.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3951333 *Apr 1, 1975Apr 20, 1976Westvaco CorporationSurgical package
US4193211 *Aug 17, 1978Mar 18, 1980The Singer CompanyModular terrain model board assembly and method of building same
US4784271 *Nov 20, 1987Nov 15, 1988The Procter & Gamble CompanyTear strip openable shipping/display container with butt joint
US4797314 *Nov 27, 1987Jan 10, 1989Armstrong World Industries, Inc.Surface covering product
US4797315 *Dec 30, 1987Jan 10, 1989Armstrong World Industries, Inc.Decorative surface coverings with dot patterns
US4816317 *Dec 30, 1987Mar 28, 1989Armstrong World Industries, Inc.Raised pattern and overcoating on substrate
US4816318 *Mar 14, 1988Mar 28, 1989Armstrong World Industries, Inc.Decorative surface covering with geometric patterns and colored particles
US4816319 *Nov 27, 1987Mar 28, 1989Armstrong World Industries, Inc.Decorative surface coverings
US4847117 *Aug 11, 1988Jul 11, 1989Armstrong World Industries, Inc.Impervious coating on substrates; radiation transparent and opaque materials
US4871345 *Aug 1, 1988Oct 3, 1989The Procter & Gamble CompanyMethod of making tear strip openable shipping/display container and blanks therefor
US4881999 *Aug 11, 1988Nov 21, 1989Armstrong World Industries, Inc.Process for the preparation of decorative surface coverings with dot patterns
US4887714 *Jan 11, 1988Dec 19, 1989Kt Technologies Inc.Pre-packaged pressure sensitive tear tape
US6354739 *May 20, 1999Mar 12, 20023M Innovative Properties CompanyTear control closing tape and container with tear control closing tape
US6513657Apr 26, 2001Feb 4, 20033M Innovative Properties Co.Product packaging with handle-forming tearable tape system
US6676583 *Dec 7, 2001Jan 13, 2004Graphic Packaging International, Inc.Web of material having layers and a method of forming one or more carton blanks from the material
US6796930 *Dec 23, 2003Sep 28, 2004Graphic Packaging International, Inc.Web of material having layers and a method of forming one or more carton blanks from the material
US7819583 *Nov 4, 2005Oct 26, 2010Graphic Packaging International, Inc.Bag structures and methods of assembling the same
US7914638 *Mar 18, 2010Mar 29, 2011Garry Cyrille Alfred Van Den BergheWrapping an object with a film using a tape for cutting the film
US8142077Apr 15, 2009Mar 27, 2012Graphic Packaging International, Inc.Bag structures and methods of assembling the same
US8187407Oct 16, 2009May 29, 2012Garry Cyrilel Alfred Van Den BergeWrapping an object with a film using a tape for cutting the film
US8361615May 16, 2012Jan 29, 2013Vandenberghe Garry Cyrille AlfredTape with a longitudinally extending filament
EP0036921A1 *Jan 9, 1981Oct 7, 1981Fr. Sander GmbH & Co.Adhesive tape
U.S. Classification428/172, 428/298.1, 428/189, 229/123.2
International ClassificationB32B37/00, B32B37/30, C09J7/02
Cooperative ClassificationB65H2701/377, B65H2301/414324, B32B37/0076, C09J7/02
European ClassificationB32B37/00D, C09J7/02
Legal Events
Oct 28, 1985AS02Assignment of assignor's interest
Effective date: 19851017
Oct 28, 1985ASAssignment
Effective date: 19851017