Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3412926 A
Publication typeGrant
Publication dateNov 26, 1968
Filing dateJul 11, 1967
Priority dateJul 11, 1967
Publication numberUS 3412926 A, US 3412926A, US-A-3412926, US3412926 A, US3412926A
InventorsBostwick Robert
Original AssigneeUnion Carbide Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Bag and closure therefor
US 3412926 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Nov. 26, 1968 R. BOSTWICK 3,412,925

BAG AND CLOSURE THEREFOR Filed July 11, 1967 INVENTOR ROBERT BOST IC K ATTORNEY United States Patent 0 3,412,926 BAG AND CLOSURE THEREFOR Robert Bostwick, Somerville, N.J., assignor to Union Carbide Corporation, a corporation of New York Filed July 11, 1967, Ser. No. 652,568 2 Claims. (Cl. 229-62) ABSTRACT OF THE DISCLOSURE A plastic bag having a closure removably attached to the body of said bag, the closure being a length of adhesive tape which can be readily removed from the bag to be used as a tape tie for said bag.

The present invention relates to a new type of closure for a bag preferably made of a plastic Such bags more and more replace paper bags and are widely used in the packaging industry. They are usually closed by gathering the top end of the bag over the contents, twisting the gathered end and tying, for example, with a piece of string, a rubber band, and the like. Sometimes it is desired to prevent air from enterthe closed bag, for example, in packaging foodstuffs which are stored in a freezer, or silverware to retard oxidation. In this case, the closure must be tied particularly tightly overthe contents of the bag. A tin tie (a tin wire coated with paper), a tape, a piece of string or a rubber band are commonly employed for this purpose. T he tin tie is often supplied by the bag manufacturer, as a separate item in the package of bags. The tape or the piece of string and the rubber band have to be supplied by the user of the bag. These closures have a common characteristic, i.e., they are separate from the bag and too frequency in many households they are not at hand when needed.

It is, therefore, an object of this invention to provide a new and improved closure for a plastic film bag which is readily available whenever needed.

Another object of this invention is to provide a bag made of a plastic film having a new and improved closure attached to said bag and easily removable therefrom.

This invention comprises a bag made of a plastic film having a length of an adhesive tape attached to the body of said bag in such a manner that it does not interfere with the filling of the bag and can be readily and quickly removed from the bag to be used as a tape tie for said bag.

The invention will be more fully described by reference to the accompanying drawings illustrating a preferred embodiment of the bag and its closure, and in which:

FIG. 1 is a plane view of a flattened bag of the invention with the adhesive removable tape closure attached thereto, and

FIG. 2 is a perspective view of a filled bag closed with the closure of the invention.

There is shown in FIG. 1 a flattened bag 1 having adhesively attached to the outside wall thereof a length of a tape 2 coated with a pressure-sensitive adhesive 3.

FIG. 2 shows the bag 1, containing an article 4 packaged therein such as a sandwich, for example, with the top tightly closed by the tape 2 wrapped therearound. An extremity of the tape may, if desired be left free of adhesive to provide a small end tab which facilitates removal of the tape from the bag.

Alternatively, the whole length of tape 2 may be coated with the adhesive, and one extremity of the coated tape, /2 in. for example, folded over the adjacent portion of tape, in adhesive to adhesive surface contact, and adhered thereto thus forming a double thickness end tab.

See

This other end tab embodiment might be preferred from a production standpoint.

The film material from which the bag is made is not critical. It can be any plastic film used in the manufacture of such bags. For example, plastic bag 1 may be made of a polyolefin film such as polyethylene, or polypropylene, or copolymers thereof, or from ethylene or propylene copolymerized with other monomers such as butene, acrylic acids, esters of acrylic acids, vinyl acetate. It can also be made of non-olefinic films such as vinyl film, i.e., polyvinyl chloride film and the like.

The tape 2 may be made of the same material as the bag, or of any other material used in the production of known tapes, i.e., plastic films, cloth, paper and the like. The only essential requirement is that the tape be strong enough to be wrapped around the top of the bag. It follows that the thickness of the tape and the thickness of the bag wall are completely independent from each other. Thus, when the tape is made of a plastic film, it may have the same thickness as the bag wall, or be thicker or thinner, as long as it meets the strength requirement. For example, if the bag is made of very thin 1 mil thick polyethylene film, and if the tape is also made of polyethylene film, then the tape should preferably be made of about 2 mil thick film.

The pressure -sensitive adhesive must meet two essential requirements, i.e., its adhesive quality should be mild enough to permit easy removal of the tape from the bag wall without tearing said wall, yet it must be strong enough to provide a satisfactory seal closure for the bag. Tests effected with commercially available adhesive tapes such as masking tapes, first-aid tapes and the like have shown that, while these tapes can be peeled off the bag soon after their application without damage to the bag wall, they will usually tear said wall when peeled off several hours after their application.

The preferred adhesive is a solution of a acrylic resin in xylene, containing 55% solids resin, with a viscosity of 4300 centipoises, a weight of 8.5 lbs. per gallon and a flash point of 39 F.

Some other resins may also be used in the pressuresensitive system of the present invention. They include latex-type adhesives made from natural or synthetic rubber containing about 50% solids, with a viscosity of from about 2500 centipoises to about 3800 centipoises and a weight per gallon of about 8 lbs. Poly(vinyl ether) resins and the like are also suitable for use in this invention. An emulsion of a poly(vinyl ether) containing 45% solids resin has been found satisfactory.

The other essential requirement as to the adhesive is that is should adhere more to the tape material than to the bag wall.

When both the bag and the tape are made of a polyolefin film, the preferred manner of meeting this requirement is to subject the tape to an electric treatment, such as a corona discharge treatment, for example, before applying the adhesive to the tape. The tape could also be subjected to a chlorine treatment, or any other known treatment for increasing the adhesiveness of the treated surface.

The materials firom which the bag and the tape are made, respectively, are not critical, as long as the adhesive adheres more to the tape than to the bag.

The greatest advantage of the invention resides in its simplicity and low cost of manufacture. The tape can be easily positioned and adhered to the bag during mass production thereof. It is an integral part of the bag until needed by the user for whom it is always at hand.

While a particular embodiment of the invention has been shown, it will be understood that the invention is not limited thereto since many modifications apparent to those skilled in the art may be made.

What is claimed is: t

1. An open plastic bag having a closure device removably attached thereto, said closure device being a length of tape having an adhesive material on one surface thereof and adhered to the body of said bag, said adhesive material adhering more to said tape than to said bag, wherein the adhesive comprises a material selected from the group consisting of acrylic resins, poly(vinyl ether) resins, natural and synthetic rubbers, said bag and tape are made of a polyolefin film, and the film tape has been subjected to an electric treatment prior to being coated with the adhesive material whereby said References Cited UNITED STATES PATENTS 2,175,430 10/ 1939 Diamond. 2,849,171 8/1958 OBrien 229-63 3,322,325 5/ 1967 Bush 229-62 DAVID M. BOCKENEK, Primary Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2175430 *Aug 23, 1938Oct 10, 1939Diamond DavidCigarette package
US2849171 *Aug 31, 1953Aug 26, 1958Bemis Bro Bag CoBag with tie member for closing and carrying it
US3322325 *Jan 30, 1962May 30, 1967Bush Roy LBag seal utilizing pressure sensitive tape having weakened transverse zones
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3481461 *Sep 20, 1968Dec 2, 1969Paxton Jerre HaleRoll of flexible plastic bags in partible sequential continuity,the individual bags having respectively echeloned filamentary closure facilities
US3512700 *Oct 30, 1968May 19, 1970Jaite Display Bag Co TheFlexible bag construction
US3662434 *May 25, 1970May 16, 1972Mobil Oil CorpPlastic loop tie closure for bags
US3874034 *Feb 7, 1974Apr 1, 1975Mobil Oil CorpPerforated thermoplastic plastic strap closure affixed to an open mouth bag structure
US4066167 *Jul 8, 1976Jan 3, 1978Keebler CompanyRecloseable package
US4771889 *Jun 17, 1987Sep 20, 1988Viskase CorporationPackaged food casing article with attached splice tape
US4902141 *Dec 28, 1987Feb 20, 1990Ron LinnewielResealable flexible packaging and sealing tape therefor
US4906108 *Mar 8, 1989Mar 6, 1990Mobil Oil CorporationCorrugated sticky tape bag tie closure
US4913560 *Mar 8, 1989Apr 3, 1990Mobil Oil CorporationStretchy sticky tape bag tie closure
US4915996 *Aug 4, 1988Apr 10, 1990Bleyer Industries, Inc.Twist-tie
US4948268 *Mar 10, 1989Aug 14, 1990John C. MarrelliPlastic film bag with integral plastic film tie element, and associated fabrication methods
US5009517 *Feb 2, 1990Apr 23, 1991John C. MarrelliPlastic film bag with integral plastic film tie element, and associated fabrication methods
US5045042 *Jul 17, 1989Sep 3, 1991John C. MarrelliPlastic film bag with integral plastic film tie element, and associated fabrication methods
US5188580 *Aug 4, 1989Feb 23, 1993John C. MarrelliPlastic film bag manufacturing apparatus and associated methods, and plastic film bags produced thereby
US5339959 *Nov 25, 1992Aug 23, 1994Qci, Inc.Disposable medical waste bag
US5346456 *Feb 18, 1993Sep 13, 1994John C. MarrelliPlastic film bag manufacturing apparatus and associated methods, and plastic film bags produced thereby
US5496599 *Apr 11, 1994Mar 5, 1996Minnesota Mining And Manufacturing CompanyMethod of unitizing packages by means of a stretchable adhesive tape
US5516581 *Jun 6, 1994May 14, 1996Minnesota Mining And Manufacturing CompanyHigh tensile strength backing and layer of pressure sensitive adhesive
US5672402 *Jun 7, 1995Sep 30, 1997Minnesota Mining And Manufacturing CompanyRemovable adhesive tape
US5989708 *Apr 8, 1997Nov 23, 19993M Innovative Properties CompanyRemovable adhesive tape
US6527900Nov 23, 1999Mar 4, 20033M Innovative Properties CompanyRemovable adhesive tape
US7946765 *Jun 28, 2007May 24, 2011The Glad Products CompanyShirred elastic sheet material
US8485380Aug 4, 2009Jul 16, 2013Kenneth A. AbramsContainer reclosure device having a flexible band
US8720725Jun 12, 2013May 13, 2014Kenneth A. AbramsContainer reclosure device having a flexible band
US20060113208 *Jan 12, 2006Jun 1, 2006Clark Dan WProtective shield for a patient control device
US20110052762 *Aug 24, 2010Mar 3, 2011Flieger JuergenPackage With a Food Product Therein and Machine for Manufacturing a Packaged Food Product
WO1994016950A1 *Dec 27, 1993Aug 4, 1994Minnesota Mining & MfgProcess for bundling and/or fixing articles by use of an extensible plastic tape
WO1995032902A1 *May 30, 1995Dec 7, 1995P S Spezial Maschf GmbhClosure unit for sealing and re-sealing a bag, and a bag with such a closure unit
Classifications
U.S. Classification383/62, 229/938, 493/215, 24/30.50P, 383/71
International ClassificationB65D63/10, B65D33/30
Cooperative ClassificationY10S229/938, B65D33/30, B65D63/1009
European ClassificationB65D33/30, B65D63/10A