CA2143273A1 - Adhesive-type retaining means for thin films - Google Patents
Adhesive-type retaining means for thin filmsInfo
- Publication number
- CA2143273A1 CA2143273A1 CA 2143273 CA2143273A CA2143273A1 CA 2143273 A1 CA2143273 A1 CA 2143273A1 CA 2143273 CA2143273 CA 2143273 CA 2143273 A CA2143273 A CA 2143273A CA 2143273 A1 CA2143273 A1 CA 2143273A1
- Authority
- CA
- Canada
- Prior art keywords
- adhesive
- adhesive layer
- retaining means
- type retaining
- layer
- 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
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Abstract
An adhesive-type retaining means having different adhesive strengths on opposing surfaces for retaining a flexible film in a fixed position on a surface.
Description
_ ADHESIVE-TYPE RETAINING MEANS
FOR THIN FILMS
FIELD OF TXE ~NV~N~ON:
The present invention relates to an adhesive-type retaining means for use in providing secure positioning of a flexible film, e.g., a plastic or paper trash bag, on a surface, e.g., in a rigid plastic or metal container.
BACKGROUND OF THE lNV~-N~-~ON:
Consumers have used rigid containers having rectangular or cylindrical shapes for many years for the collection and retention of trash and other collectible articles. Further, paper and plastic bags have been used as liners for such rigid containers for the purpose of making possible convenient and sanitary collection of trash and other materials, within the removable liner. Owing to the impervious characteristics of plastic, plas~ic liners make final collection and removal of contained trash a simple, sanitary operation, as compared to untreated paper liners.
One problem observed in using plastic bags as liners for rigid containers is that the thin polymeric film materials (e.g., the various polyethylenes, and polypropylenes) from which such bags are made tend to be drawn down into the rigid container during u~e by the force of trash and/or other materials being placed into the rigid container having the plastic liner.
'N~O~MATION DISCLOSURE STATEMENT:
Numerous proposals have been made to provide some _ sort of means for retaining a thin plastic liner (or "plastic bag") after its placement in a rigid container, e.g., placement of a thin plastic bag in a trash container.
A search of the patent literature for such plastic bag retaining means for use in association with rigid containers located the following patents:
.
.S. Patent No. Pat-ntee 3,784,049 Hawk 3,B36,037 Bass 4,027,774 Cote 4,319,694 Nehrbass et al.
4,418,835 Watts 4,570,304 Montreuil et al.
4,576,310 Isgar et al.
4,735,340 Preston 4,763,808 Guhl et al.
4,834,260 Auten 4,856,675 Palazzola 4,867,339 Hahn 4,867,340 Byers 4,978,231 Ling et al.
The majority of the above patents deal with either a hook or loop-type fastening means for affixing a handle-type bag to a rigid container or a bag rack (e.g., U.S. Patent No~.: 4,41B,835; 4,576,310;
4,735,340; 4,763,BOB; 4,856,675; and 4,867,339) or with rim-type retaining means (e.g., U.S. Patent Nos.
3,784,049 tlocking ribs angularly spaced around the rim; see FIG. 1], 3,B36,037 [bag secured to lid at spaced locations], 4,319,694 [cover with tabs which frictionally engage the liner] and 4,834,260 [rim attachment with penetrating grippers; see FIG. lA and lB]) show container modifications for retention of a plastic liner.
The remaining patents disclose three additional ways of addressing the problem of retention of a flexible plastic bag in a rigid container. U.S. Patent No. 4,570,304 discloses a closure fastener for disposable trash bags where in one embodiment (See:
FIG. V and FIG. VI of U.S. Patent No. 4,570,304) the closure fastener is employed to secure the trash bag snugly against the outside of the trash container.
U.S. Patent No. 4,867,340 discloses a rim and flange arrangement having a resilient layer of adhesive material for use in adhering the flexible bag to the container rim. The resilient adhesive means is an adhesive material yielding under manually applied finger pressure and having a peel-away protective layer overlying the single adhesive material.
The above prior art generally discloses means by which to adhere a plastic bag to a trash container by means of clip-type retaining means or by use of simple adhesives. Applicants have discovered an i~ oved adhesive-type retaining means which solves many of the problems associated with the prior art. For example, use of an adhesive as disclosed in U.S. Patent No.
4,867,340 fails to take into account the tendency of a single adhesive material to be pulled indiscriminately ~rom the rigid container and/or film ~urface when the user removes the film.
21~3273 Applicants have developed a novel adhesive-type retaining means wherein reuse and ease of use have been achieved by use of two different adhesive forces on opposing sides of the adhesive-type retaining means.
Further, in a further embo~;ment, the prior art problem of indiscriminate ,e...o~al of the adhesive retaining means is overcome by proper placement on one or both of the opposing adhesive surfaces of a non-adhesive end portion whereby the film may be preferentially removed from the adhesive surface to which it is adhered and/or the adhesive-type retaining means can be le-l-o~ed from - the surface to which it is adhered.
DESCRIPTION OF THE DR~W~NGS:
FIG. 1 is a side view of one embodiment of an adhesive bag retaining means according to this invention.
FIG. 2 is a side view of one embodiment of an adhesive bag retaining means according to this invention having one non-adhesive end portion.
FIG. 3 is a side view of one embodiment of an adhesive bag retaining means according to this invention having two non-adhesive end portions.
FIG. 4 is a side view of one embodiment of an adhesive bag retaining means according to this invention having two non-adhesive end portions and two ~e...~vable adhe~ive protective covers.
FIG. 5 is a side view of one emboA;~nt of an adhesive bag retaining means according to this invention having one non-adhesive end portion on one adhesive surface and one non-adhesive portion on the opposing adhesive surface.
SUMMARY OF THE lNv~N~lON:
The instant invention relates to an adhesive-type bag retaining means for thin films for attachment to a rigid surface, e.g., a trash container, wherein the adhesive-type retaining means iB characterized as having opposing adhesive surfaces of different adhesive strength with a first adhesive surface for adherence to a rigid surface (preferably a rigid trash container) and a second adhesive surface for adherencé to the thin film wherein the adhesive strength of the first surface for said rigid surface is greater than the adhesive strength of the second adhesive surface for the thin film (preferably a plastic liner). By having this difference in adhesive strength the adhesive-type retaining means can be preferentially retained on a rigid surface for use with a multiplicity of thin films, e.g., plastic bags, since the adhesive-type retaining means will not be ~e",oved when the thin film is separated from the second adhesive surface owing to the greater adhesive strength between the rigid surface and the first adhesive surface.
The anticipated primary use for the adhesive-type retaining means of this in~ention is for retaining plastic bags in a Relected position on a rigid surface, e.g., positioned in a rigid trash container.
Accordingly, and for ease of discussion, the adhesive-type retaining means of this invention will be discussed in reference to the thin film being in the form of a plastic bag and the surface being the inner or outer surface of a rigid trash container. Such discussion not meant to be limiting of the invention.
In further embodiments the adhesive-type retaining means i6 characterized as having one or more non-adhesive portions on the ends of the second adhesive surface and/or on at least one end of the first adhesive surface. The presence of these non adhesive end portions facilitate ~e,-,oval of the plastic bag from the adhesive-type retaining means and provide for easy Lel-,o~al of the adhesive-type retaining means from the rigid container when appropriate.
The adhesive material6 employed herein may be any suitable adhesive material including acrylic, natural and synthetic rubber or polyvinyl ether based pressure sensitive adhesives.
DETAILED DESCRIPTION OF THE lNV~N~lON:
The instant invention generally relates to an adhesive retaining means for a thin film and is employed in its preferred use as a adhesive-type retaining means for a plastic bag which is attached to a rigid container, e.g., plastic or metal trash container, for use in retaining a thin film plastic bag in a selected position in relation to the rigid container.
The adhesive-type retaining means is preferably employed with a rigid trash cont~;~er, although the adhesive-type retaining means may be ad~antageously employed to adhere any thin film to any surface.
Preferably, the adhesive-type retaining means i~
affixed to the outer ~urface of a rigid container owing to the downward forces which are generated by 21~3273 putting trash in a trash container, but the adhesive-type retaining means may also be used on the inner surface of the rigid container. When employed on a rigid container as a retAin;ng means for a thin film plastic bag, the adhesive-type retA;~;ng means is associated with the rigid container after its manufacture as a "stick-on" member on the surface of the container, preferably the outer surface at or below the periphery-of the rim of the rigid container.
Excess bag material resulting from the size of the bag being a size greater than the rim of the rigid container may be pulled down over the rim and over the outside surface of the rigid container and brought into contact with the outer adhesive surface of the adhesive-type retaining means. The plastic bag is then held in place by the adhesive-type retaining means by its adhesive nature as a result of the adhesive force of the adhesive-type retaining means with the plastic bag. As a result of the difference in the adhesive force of the adhesive-type retaining means for the container's surface in contrast to the plastic bag, the plastic bag may be preferentially removed from the adhesive-type retaining means while the adhesive-type retaining means remains adhered to the surface of the container along the first adhesive surface. When the adhesive-type retaining means of this invention has one or more non-adhesive end portions, as hereinafter discussed, the ease of ~eparation of the plastic bag and/or the rigid container is further improved. In one embodiment the difference in adhesive forces can be zero or reversed when the non-adhesive end portions are employed so as to provide a ~tarter edge whereat the bag may be peeled from the adhesive-type retAi~ing means.
D-1~642 7 -- _ 21~3273 Referring to FIG. 1, 10 designates an adhesive-type retaining means according to this invention having a core layer 12, first adhesive layer 14 and second adhesive layer 16. For ease of discussion herein, first adhesive layer 14 will be designated as the adhesive layer to be placed in contact with the thin film (e.g., a plastic bag) and adhesive layer 16 will be designated as the adhesive layer to be placed in contact with a rigid surface (e.g., rigid trash container). It iB understood that these designations are for convenient reference herein. FIG. 1 shows one embodiment of the invention wherein the adhesive-type retaining means comprises opposing adhesive surfaces having different adhesive forces. The term "adhesive force" is used herein to designate the force required to separate two surfaces and may include different forces resulting from the use of different adhesive materials or from the angle of adherence or separation of opposing adhesive surfaces to the surfaces to which such are adhered. For example, by having a non-adhesive portion on the end of the first adhesive surface and not on the opposing end of the first adhesive surface the angle of Le.,.oval of a thin film from the first adhesive surface will be by a peeling action which provides for different adhesive forces for the first adhesive surface and the second adhesive surface with the respective surfaces they adhere to, although the actual adhesive strength provided by the adhesives, in fact, may be the same. In one e~ho~i~ent the first adhesive layer 14 and second adhesive layer 16 are different adhesives having different adhesi~e forces with the adhesive force of the second adhesive layer for the rigid surface being greater than the adhesive force of the first adhesive layer for the flexible film.
FIG. 2 shows a further embodiment where adhesive-type retaining means 20 has a non-adhesive portion 18 added to one end of the first adhesive layer 14. Non-adhesive portion 18 provides a non-adhesive leading edge to facilitate improved ease of separation of first adhesive layer 14 from a plastic bag (not shown) which has been placed in contact with first adhesive layer 14. In this embodiment the adhesive forces of the two adhesive surfaces need not be different per se, since the use of a leading edge to peel the plastic bag from the adhesive-type retaining means provide a differential removal force owing to the angle of the peeling action. FIG. 3 shows a further embodiment where adhesive-type retaining means 30 has a second non-adhesive portion wherein it comprises first adhesive layer 14 and second adhesive layer 16 on opposing sides of core layer 12 with first adhesive layer 14 having non-adhesive end portion 18 and non-adhesive end portion 22. Non-adhesive end portions 18 and 22 have similar functions in that each provides a non-adhesive leading edge on first adhesive layer 14 to facilitate improved ease of separation of the first adhesive layer 14 from a plastic bag (not ~hown).
FIG. 4 is a further embodiment showing adhesive-type retaining means 40 having first adhesive layer 14, Qecond adhesive layer 16, core layer 12, non-adhesive end portion 18, and non-adhesive end portion 22. Since first adhesive layer 14 and second adhesive layer 16 have adhesive surfaces it is preferred to provide non-adhesive protective layers 24 and 26 to protect the adhesive layer~ from contacting another surface prior D-l~b42 9 _ 2143273 to use in retaining a plastic bag to a rigid container.
Non-adhesive protective layers 24 and 26 are shown as extending a length longer than the respective adhesive layer which it protects, although it may be the same length as the length of the a &esive layer which it protects. Non-adhesive protective layers 24 and 26 are both ~e-"oved when the adhesive-type retaining means are employed, as described herein. FIG. 5 shows a further embodiment where adhesive-type retaining means 50 is similar to that shown in FIG. 2 except that a non-adhesive portion 28 i8 provided on the second adhesive layer 16 on the end opposite the non-adhesive portion on the end of first adhesive layer 14. Alternatively a non-adhesive portion similar to non-adhesive portion 28 may be provided on either end of second adhesive layer 16 of the embodiment shown in FIG. 3. Further, non-adhesive protective layers, as shown in FIG. 4 may be employed (not shown). The purpose of providing non-adhesive portion 28 on one end (or both ends; not shown) of second adhesive layer 16 is to provide a leading edge for initiating ~e..,oval of the adhesive-type retaining means from a rigid container (not shown) to which it has been affixed. Although a non-adhesive portion may be provided to both ends of second-adhesive layer 16, such is not required or preferred. Ry employing only one non-adhesive portion on one end of second adhesive layer 16 one can preferentially begin separation of a plastic ~ag from one end of the adhesive-type ret~;n;ng means which is fully secured to a rigid container at an adhesive end portion.
The adhesive-type ret~;n;ng means of this invention is preferably employed as the retaining means for a plastic bag in a rigid trash container. The 21~32~3 adhesive-type retaining means is affixed to the exterior surface of the rigid container, although such may be affixed at any location on the exterior or interior surface of the rigid trash container whereby it acts to secure the plastic bag at a preselected location on the rigid trash contAiner. Plastic bags formed of a thin plastic film generally have a thickness of between about 0.2 and about 3.0 mil (about 0.0002 to about 0.003 inches) of a plastic material (generally a low and/or high density polyethylene resin) are the preferred anticipated use of the adhesive-type retaining means for use with trash containers. Other retaining uses may be made of the instant invention as will be apparent to those skilled in the art.
The adhesive-type retaining means of the instant invention is formed as a separate article which is affixed to a surface, e.g., rigid container by adhesive affixing means selected in relation to the structure of the rigid container. The affixing means may be any suitable adhesive means including pressure sensitive adhesives.
The adhesive-type retA;ning means of this invention are manufactured from conventional materials and adhesive materials. The adhesive materials may be any of the well known pressure sensitive adhesives including acrylic, natural and synthetic rubber or polyvinyl ether based pressure sensitive adhesives.
With a pressure sensitive adhesive, it is a simple matter to contact the 6urfaces by applying pressure with the user's finger. A pressure sensitive adhesive is preferred for the instant adhesive-type retaining _ means. A useful differential tack tape for use herein i9 sold by 3M under the trade designation Scotch~
product numbers 9424 and 9425. The physical and performance properties of these materials are as follows:
TABLE A
PHYSICAL PROPERTIES AND PERFORMANCE CHARACTERISTICS
Adhesive Type Acrylic Acrylic Adhesive to Steel:
(ASTM) Method) Non linered side 45 Oz./in. 45 oz./in.
(49 N/lOOmm) (49 N/lOOmm) Linered side 12 oz./in. 12 oz./in.
(13 N/lOOmm) (13 N/lOOmm) Relative High Temperature Operating Ranges: 125F (52C) 125F (52C) Relative Solvent Resistance Good Good W Resistance Very Good Very Good Available Widths:
(Subject to Minimum Order Requirements) Suitable pressure sensitive adhesives include acrylic, natural and synthetic rubber types. The adhesive may be applied in a uniform thickness of 0.1 to 0.5 mil depending upon the type of adhesive employed and the nature of the additives therein, using conventional application techniques such as flexographic printing, wound wire bar coating, knife coating, extrusion coating, or other methods, depending upon the adhesive chosen. The adhesive could be a hot melt type, either heat activated or pressure sensitive, depending upon the end use. The adhesive may also be a solvent based liquid adhesive, including acrylate, rubber or urethane based pressure sensitives. They may also be based on latex formulations, including acrylic latexes, such as UCAR-152, product of Union Carbide Corporation, are commercially available to produce pressure sensitive adhesives by properly blending the latex with any of a variety of commercial packyfiers. Of course, two different adhesive materials will be employed 80 as to provide an adhesive-type retAin;~g means which provides different adhesive force on opposing surfaces. For typical applications, the difference in the adhesive forces of the opposing adhesive 6urfaces is selected to provide firm adhesive to the respective bag and rigid container surfaces while still being able to provide non-permanent adhesion to both surfaces. The adhesive force of each adhesive surface is preferably an adhesive force of 45 oz./in. for the adhesive layer in contact with the rigid container and about 12 oz./in.
for the adhesive layer in contact with the plastic bag. A difference in adhesive force of between about 30 oz./in. and about 35 oz./in. between the first adhesive layer and the second adhesive layer whereby preferential release by the first adhesive layer for a plastic bag will be provided. The re~ining materials may be made of most any known material but will preferably be paper or, plastic owing to their cost and ability to be formed into thin sheet or film material.
The core material referred to in the drawings is provided to form a surface onto which the two adhe6ive layers may be placed and provides for ~eparation of the adhesive materials and gives form to the adhesive-type retaining means a8 a flexible solid support.
Similarly, the non-adhesive end portions and protective D-1~642 13 layers may be made of most any known material but will preferably be paper or plastic. As will be apparent to one skilled in the art, the selection of the materials of construction will be related to the particular portion of the adhesive-type retaining means the particular material is to be used to manufacture. For example, since one side of the non-adhesive protective layers will be placed in contact with the adhesive layers it is preferred to select a plastic or coated paper which will allow for easy removal from the adhesive-type retaining means.
The ~imen~ions of the adhesive-type retaining means may vary with the anticipated use, e.g., the weight of the film or plastic bag to be retained to a surface. In one embodiment the adhesive-type retaining means i8 about 3.5 inches long and 3/4 inches wide having non-adhesive end portions on both ends of the first adhesive layer (the layer which will contact the film or plastic bag) and on one end of the second adhesive layer and have a length of about 3/16 across the width of the respective first and second adhesive layers. These dimensions have been found particularly appropriate for use with plastic bags having a thickness up to about 3.0 mils and a capacity of up to about 55 gallons when used with similarly sized trash containers. Other dimensions may be employed depending on the selected use and relative adhesive strengths of the first adhesive layer and second adhesive layer.
The actual placement of the adhesive-type retaining means on the rigid container will be related to the design of the rigid container and a function of the preference of the user. Since many outdoor trash containers have a lid, it will generally be preferable -21~3273 to affix the adhesive-type retaining means on the outside of the trash container below the rim at the top of the container. The additional frictional forces resulting from the overlay of the plastic liner on the rim of the container are also beneficial in retaining the plastic liner in a fixed position in the rigid container.
FOR THIN FILMS
FIELD OF TXE ~NV~N~ON:
The present invention relates to an adhesive-type retaining means for use in providing secure positioning of a flexible film, e.g., a plastic or paper trash bag, on a surface, e.g., in a rigid plastic or metal container.
BACKGROUND OF THE lNV~-N~-~ON:
Consumers have used rigid containers having rectangular or cylindrical shapes for many years for the collection and retention of trash and other collectible articles. Further, paper and plastic bags have been used as liners for such rigid containers for the purpose of making possible convenient and sanitary collection of trash and other materials, within the removable liner. Owing to the impervious characteristics of plastic, plas~ic liners make final collection and removal of contained trash a simple, sanitary operation, as compared to untreated paper liners.
One problem observed in using plastic bags as liners for rigid containers is that the thin polymeric film materials (e.g., the various polyethylenes, and polypropylenes) from which such bags are made tend to be drawn down into the rigid container during u~e by the force of trash and/or other materials being placed into the rigid container having the plastic liner.
'N~O~MATION DISCLOSURE STATEMENT:
Numerous proposals have been made to provide some _ sort of means for retaining a thin plastic liner (or "plastic bag") after its placement in a rigid container, e.g., placement of a thin plastic bag in a trash container.
A search of the patent literature for such plastic bag retaining means for use in association with rigid containers located the following patents:
.
.S. Patent No. Pat-ntee 3,784,049 Hawk 3,B36,037 Bass 4,027,774 Cote 4,319,694 Nehrbass et al.
4,418,835 Watts 4,570,304 Montreuil et al.
4,576,310 Isgar et al.
4,735,340 Preston 4,763,808 Guhl et al.
4,834,260 Auten 4,856,675 Palazzola 4,867,339 Hahn 4,867,340 Byers 4,978,231 Ling et al.
The majority of the above patents deal with either a hook or loop-type fastening means for affixing a handle-type bag to a rigid container or a bag rack (e.g., U.S. Patent No~.: 4,41B,835; 4,576,310;
4,735,340; 4,763,BOB; 4,856,675; and 4,867,339) or with rim-type retaining means (e.g., U.S. Patent Nos.
3,784,049 tlocking ribs angularly spaced around the rim; see FIG. 1], 3,B36,037 [bag secured to lid at spaced locations], 4,319,694 [cover with tabs which frictionally engage the liner] and 4,834,260 [rim attachment with penetrating grippers; see FIG. lA and lB]) show container modifications for retention of a plastic liner.
The remaining patents disclose three additional ways of addressing the problem of retention of a flexible plastic bag in a rigid container. U.S. Patent No. 4,570,304 discloses a closure fastener for disposable trash bags where in one embodiment (See:
FIG. V and FIG. VI of U.S. Patent No. 4,570,304) the closure fastener is employed to secure the trash bag snugly against the outside of the trash container.
U.S. Patent No. 4,867,340 discloses a rim and flange arrangement having a resilient layer of adhesive material for use in adhering the flexible bag to the container rim. The resilient adhesive means is an adhesive material yielding under manually applied finger pressure and having a peel-away protective layer overlying the single adhesive material.
The above prior art generally discloses means by which to adhere a plastic bag to a trash container by means of clip-type retaining means or by use of simple adhesives. Applicants have discovered an i~ oved adhesive-type retaining means which solves many of the problems associated with the prior art. For example, use of an adhesive as disclosed in U.S. Patent No.
4,867,340 fails to take into account the tendency of a single adhesive material to be pulled indiscriminately ~rom the rigid container and/or film ~urface when the user removes the film.
21~3273 Applicants have developed a novel adhesive-type retaining means wherein reuse and ease of use have been achieved by use of two different adhesive forces on opposing sides of the adhesive-type retaining means.
Further, in a further embo~;ment, the prior art problem of indiscriminate ,e...o~al of the adhesive retaining means is overcome by proper placement on one or both of the opposing adhesive surfaces of a non-adhesive end portion whereby the film may be preferentially removed from the adhesive surface to which it is adhered and/or the adhesive-type retaining means can be le-l-o~ed from - the surface to which it is adhered.
DESCRIPTION OF THE DR~W~NGS:
FIG. 1 is a side view of one embodiment of an adhesive bag retaining means according to this invention.
FIG. 2 is a side view of one embodiment of an adhesive bag retaining means according to this invention having one non-adhesive end portion.
FIG. 3 is a side view of one embodiment of an adhesive bag retaining means according to this invention having two non-adhesive end portions.
FIG. 4 is a side view of one embodiment of an adhesive bag retaining means according to this invention having two non-adhesive end portions and two ~e...~vable adhe~ive protective covers.
FIG. 5 is a side view of one emboA;~nt of an adhesive bag retaining means according to this invention having one non-adhesive end portion on one adhesive surface and one non-adhesive portion on the opposing adhesive surface.
SUMMARY OF THE lNv~N~lON:
The instant invention relates to an adhesive-type bag retaining means for thin films for attachment to a rigid surface, e.g., a trash container, wherein the adhesive-type retaining means iB characterized as having opposing adhesive surfaces of different adhesive strength with a first adhesive surface for adherence to a rigid surface (preferably a rigid trash container) and a second adhesive surface for adherencé to the thin film wherein the adhesive strength of the first surface for said rigid surface is greater than the adhesive strength of the second adhesive surface for the thin film (preferably a plastic liner). By having this difference in adhesive strength the adhesive-type retaining means can be preferentially retained on a rigid surface for use with a multiplicity of thin films, e.g., plastic bags, since the adhesive-type retaining means will not be ~e",oved when the thin film is separated from the second adhesive surface owing to the greater adhesive strength between the rigid surface and the first adhesive surface.
The anticipated primary use for the adhesive-type retaining means of this in~ention is for retaining plastic bags in a Relected position on a rigid surface, e.g., positioned in a rigid trash container.
Accordingly, and for ease of discussion, the adhesive-type retaining means of this invention will be discussed in reference to the thin film being in the form of a plastic bag and the surface being the inner or outer surface of a rigid trash container. Such discussion not meant to be limiting of the invention.
In further embodiments the adhesive-type retaining means i6 characterized as having one or more non-adhesive portions on the ends of the second adhesive surface and/or on at least one end of the first adhesive surface. The presence of these non adhesive end portions facilitate ~e,-,oval of the plastic bag from the adhesive-type retaining means and provide for easy Lel-,o~al of the adhesive-type retaining means from the rigid container when appropriate.
The adhesive material6 employed herein may be any suitable adhesive material including acrylic, natural and synthetic rubber or polyvinyl ether based pressure sensitive adhesives.
DETAILED DESCRIPTION OF THE lNV~N~lON:
The instant invention generally relates to an adhesive retaining means for a thin film and is employed in its preferred use as a adhesive-type retaining means for a plastic bag which is attached to a rigid container, e.g., plastic or metal trash container, for use in retaining a thin film plastic bag in a selected position in relation to the rigid container.
The adhesive-type retaining means is preferably employed with a rigid trash cont~;~er, although the adhesive-type retaining means may be ad~antageously employed to adhere any thin film to any surface.
Preferably, the adhesive-type retaining means i~
affixed to the outer ~urface of a rigid container owing to the downward forces which are generated by 21~3273 putting trash in a trash container, but the adhesive-type retaining means may also be used on the inner surface of the rigid container. When employed on a rigid container as a retAin;ng means for a thin film plastic bag, the adhesive-type retA;~;ng means is associated with the rigid container after its manufacture as a "stick-on" member on the surface of the container, preferably the outer surface at or below the periphery-of the rim of the rigid container.
Excess bag material resulting from the size of the bag being a size greater than the rim of the rigid container may be pulled down over the rim and over the outside surface of the rigid container and brought into contact with the outer adhesive surface of the adhesive-type retaining means. The plastic bag is then held in place by the adhesive-type retaining means by its adhesive nature as a result of the adhesive force of the adhesive-type retaining means with the plastic bag. As a result of the difference in the adhesive force of the adhesive-type retaining means for the container's surface in contrast to the plastic bag, the plastic bag may be preferentially removed from the adhesive-type retaining means while the adhesive-type retaining means remains adhered to the surface of the container along the first adhesive surface. When the adhesive-type retaining means of this invention has one or more non-adhesive end portions, as hereinafter discussed, the ease of ~eparation of the plastic bag and/or the rigid container is further improved. In one embodiment the difference in adhesive forces can be zero or reversed when the non-adhesive end portions are employed so as to provide a ~tarter edge whereat the bag may be peeled from the adhesive-type retAi~ing means.
D-1~642 7 -- _ 21~3273 Referring to FIG. 1, 10 designates an adhesive-type retaining means according to this invention having a core layer 12, first adhesive layer 14 and second adhesive layer 16. For ease of discussion herein, first adhesive layer 14 will be designated as the adhesive layer to be placed in contact with the thin film (e.g., a plastic bag) and adhesive layer 16 will be designated as the adhesive layer to be placed in contact with a rigid surface (e.g., rigid trash container). It iB understood that these designations are for convenient reference herein. FIG. 1 shows one embodiment of the invention wherein the adhesive-type retaining means comprises opposing adhesive surfaces having different adhesive forces. The term "adhesive force" is used herein to designate the force required to separate two surfaces and may include different forces resulting from the use of different adhesive materials or from the angle of adherence or separation of opposing adhesive surfaces to the surfaces to which such are adhered. For example, by having a non-adhesive portion on the end of the first adhesive surface and not on the opposing end of the first adhesive surface the angle of Le.,.oval of a thin film from the first adhesive surface will be by a peeling action which provides for different adhesive forces for the first adhesive surface and the second adhesive surface with the respective surfaces they adhere to, although the actual adhesive strength provided by the adhesives, in fact, may be the same. In one e~ho~i~ent the first adhesive layer 14 and second adhesive layer 16 are different adhesives having different adhesi~e forces with the adhesive force of the second adhesive layer for the rigid surface being greater than the adhesive force of the first adhesive layer for the flexible film.
FIG. 2 shows a further embodiment where adhesive-type retaining means 20 has a non-adhesive portion 18 added to one end of the first adhesive layer 14. Non-adhesive portion 18 provides a non-adhesive leading edge to facilitate improved ease of separation of first adhesive layer 14 from a plastic bag (not shown) which has been placed in contact with first adhesive layer 14. In this embodiment the adhesive forces of the two adhesive surfaces need not be different per se, since the use of a leading edge to peel the plastic bag from the adhesive-type retaining means provide a differential removal force owing to the angle of the peeling action. FIG. 3 shows a further embodiment where adhesive-type retaining means 30 has a second non-adhesive portion wherein it comprises first adhesive layer 14 and second adhesive layer 16 on opposing sides of core layer 12 with first adhesive layer 14 having non-adhesive end portion 18 and non-adhesive end portion 22. Non-adhesive end portions 18 and 22 have similar functions in that each provides a non-adhesive leading edge on first adhesive layer 14 to facilitate improved ease of separation of the first adhesive layer 14 from a plastic bag (not ~hown).
FIG. 4 is a further embodiment showing adhesive-type retaining means 40 having first adhesive layer 14, Qecond adhesive layer 16, core layer 12, non-adhesive end portion 18, and non-adhesive end portion 22. Since first adhesive layer 14 and second adhesive layer 16 have adhesive surfaces it is preferred to provide non-adhesive protective layers 24 and 26 to protect the adhesive layer~ from contacting another surface prior D-l~b42 9 _ 2143273 to use in retaining a plastic bag to a rigid container.
Non-adhesive protective layers 24 and 26 are shown as extending a length longer than the respective adhesive layer which it protects, although it may be the same length as the length of the a &esive layer which it protects. Non-adhesive protective layers 24 and 26 are both ~e-"oved when the adhesive-type retaining means are employed, as described herein. FIG. 5 shows a further embodiment where adhesive-type retaining means 50 is similar to that shown in FIG. 2 except that a non-adhesive portion 28 i8 provided on the second adhesive layer 16 on the end opposite the non-adhesive portion on the end of first adhesive layer 14. Alternatively a non-adhesive portion similar to non-adhesive portion 28 may be provided on either end of second adhesive layer 16 of the embodiment shown in FIG. 3. Further, non-adhesive protective layers, as shown in FIG. 4 may be employed (not shown). The purpose of providing non-adhesive portion 28 on one end (or both ends; not shown) of second adhesive layer 16 is to provide a leading edge for initiating ~e..,oval of the adhesive-type retaining means from a rigid container (not shown) to which it has been affixed. Although a non-adhesive portion may be provided to both ends of second-adhesive layer 16, such is not required or preferred. Ry employing only one non-adhesive portion on one end of second adhesive layer 16 one can preferentially begin separation of a plastic ~ag from one end of the adhesive-type ret~;n;ng means which is fully secured to a rigid container at an adhesive end portion.
The adhesive-type ret~;n;ng means of this invention is preferably employed as the retaining means for a plastic bag in a rigid trash container. The 21~32~3 adhesive-type retaining means is affixed to the exterior surface of the rigid container, although such may be affixed at any location on the exterior or interior surface of the rigid trash container whereby it acts to secure the plastic bag at a preselected location on the rigid trash contAiner. Plastic bags formed of a thin plastic film generally have a thickness of between about 0.2 and about 3.0 mil (about 0.0002 to about 0.003 inches) of a plastic material (generally a low and/or high density polyethylene resin) are the preferred anticipated use of the adhesive-type retaining means for use with trash containers. Other retaining uses may be made of the instant invention as will be apparent to those skilled in the art.
The adhesive-type retaining means of the instant invention is formed as a separate article which is affixed to a surface, e.g., rigid container by adhesive affixing means selected in relation to the structure of the rigid container. The affixing means may be any suitable adhesive means including pressure sensitive adhesives.
The adhesive-type retA;ning means of this invention are manufactured from conventional materials and adhesive materials. The adhesive materials may be any of the well known pressure sensitive adhesives including acrylic, natural and synthetic rubber or polyvinyl ether based pressure sensitive adhesives.
With a pressure sensitive adhesive, it is a simple matter to contact the 6urfaces by applying pressure with the user's finger. A pressure sensitive adhesive is preferred for the instant adhesive-type retaining _ means. A useful differential tack tape for use herein i9 sold by 3M under the trade designation Scotch~
product numbers 9424 and 9425. The physical and performance properties of these materials are as follows:
TABLE A
PHYSICAL PROPERTIES AND PERFORMANCE CHARACTERISTICS
Adhesive Type Acrylic Acrylic Adhesive to Steel:
(ASTM) Method) Non linered side 45 Oz./in. 45 oz./in.
(49 N/lOOmm) (49 N/lOOmm) Linered side 12 oz./in. 12 oz./in.
(13 N/lOOmm) (13 N/lOOmm) Relative High Temperature Operating Ranges: 125F (52C) 125F (52C) Relative Solvent Resistance Good Good W Resistance Very Good Very Good Available Widths:
(Subject to Minimum Order Requirements) Suitable pressure sensitive adhesives include acrylic, natural and synthetic rubber types. The adhesive may be applied in a uniform thickness of 0.1 to 0.5 mil depending upon the type of adhesive employed and the nature of the additives therein, using conventional application techniques such as flexographic printing, wound wire bar coating, knife coating, extrusion coating, or other methods, depending upon the adhesive chosen. The adhesive could be a hot melt type, either heat activated or pressure sensitive, depending upon the end use. The adhesive may also be a solvent based liquid adhesive, including acrylate, rubber or urethane based pressure sensitives. They may also be based on latex formulations, including acrylic latexes, such as UCAR-152, product of Union Carbide Corporation, are commercially available to produce pressure sensitive adhesives by properly blending the latex with any of a variety of commercial packyfiers. Of course, two different adhesive materials will be employed 80 as to provide an adhesive-type retAin;~g means which provides different adhesive force on opposing surfaces. For typical applications, the difference in the adhesive forces of the opposing adhesive 6urfaces is selected to provide firm adhesive to the respective bag and rigid container surfaces while still being able to provide non-permanent adhesion to both surfaces. The adhesive force of each adhesive surface is preferably an adhesive force of 45 oz./in. for the adhesive layer in contact with the rigid container and about 12 oz./in.
for the adhesive layer in contact with the plastic bag. A difference in adhesive force of between about 30 oz./in. and about 35 oz./in. between the first adhesive layer and the second adhesive layer whereby preferential release by the first adhesive layer for a plastic bag will be provided. The re~ining materials may be made of most any known material but will preferably be paper or, plastic owing to their cost and ability to be formed into thin sheet or film material.
The core material referred to in the drawings is provided to form a surface onto which the two adhe6ive layers may be placed and provides for ~eparation of the adhesive materials and gives form to the adhesive-type retaining means a8 a flexible solid support.
Similarly, the non-adhesive end portions and protective D-1~642 13 layers may be made of most any known material but will preferably be paper or plastic. As will be apparent to one skilled in the art, the selection of the materials of construction will be related to the particular portion of the adhesive-type retaining means the particular material is to be used to manufacture. For example, since one side of the non-adhesive protective layers will be placed in contact with the adhesive layers it is preferred to select a plastic or coated paper which will allow for easy removal from the adhesive-type retaining means.
The ~imen~ions of the adhesive-type retaining means may vary with the anticipated use, e.g., the weight of the film or plastic bag to be retained to a surface. In one embodiment the adhesive-type retaining means i8 about 3.5 inches long and 3/4 inches wide having non-adhesive end portions on both ends of the first adhesive layer (the layer which will contact the film or plastic bag) and on one end of the second adhesive layer and have a length of about 3/16 across the width of the respective first and second adhesive layers. These dimensions have been found particularly appropriate for use with plastic bags having a thickness up to about 3.0 mils and a capacity of up to about 55 gallons when used with similarly sized trash containers. Other dimensions may be employed depending on the selected use and relative adhesive strengths of the first adhesive layer and second adhesive layer.
The actual placement of the adhesive-type retaining means on the rigid container will be related to the design of the rigid container and a function of the preference of the user. Since many outdoor trash containers have a lid, it will generally be preferable -21~3273 to affix the adhesive-type retaining means on the outside of the trash container below the rim at the top of the container. The additional frictional forces resulting from the overlay of the plastic liner on the rim of the container are also beneficial in retaining the plastic liner in a fixed position in the rigid container.
Claims (16)
1. An adhesive-type retaining means for receiving and securing a film material to a surface wherein said adhesive-type retaining means has a first adhesive layer for adhesive attachment to a film material and a second adhesive layer for adhesive attachment to a surface, wherein said first and second adhesive layers have different adhesive strengths with the adhesive strength of said first adhesive layer for said film material being less than the adhesive strength of said second adhesive layer for said surface.
2. An adhesive-type retaining means according to claim 1 for receiving and securing a plastic film material to a surface wherein said adhesive-type retaining means has a first adhesive layer for adhesive attachment to said plastic film material and a second adhesive layer for adhesive attachment to said surface, wherein said first adhesive layer has one non-adhesive end portion.
3. An adhesive-type retaining means according to claim 2 wherein said first adhesive layer has two non-adhesive end portions.
4. An adhesive-type retaining means according to claim 2 wherein said second adhesive layer has a non-adhesive end portion on the end opposite the non-adhesive end portion of the first adhesive layer.
5. An adhesive-type retaining means according to claim 3 wherein said second adhesive layer has a non-adhesive end portion.
6. An adhesive-type retaining means according to claim 1 wherein said adhesive strength of said first adhesive layer for said film material is less than said adhesive strength of said second adhesive layer for said surface whereby after adhesion of said first adhesive layer to said film material and adhesion of said second adhesive layer to said surface said first adhesive layer will separate from said film material preferentially to said separation of said second adhesive layer from said surface owing to the lesser adhesive force of the first adhesive layer as compared to the adhesive force of said second adhesive layer.
7. An adhesive-type retaining means according to claim 1 wherein said film material is a plastic bag and said surface is a rigid trash container.
8. An adhesive-type retaining means according to claim 2 wherein said film material is a plastic bag and said surface is a rigid trash container.
9. An adhesive-type retaining means for securing a plastic film to a surface, said adhesive-type retaining means having a first adhesive layer and a second adhesive layer each layer having two end portions, where at least one end portion of at least one layer is a retaining non-adhesive end portion.
10. An adhesive-type retaining means according to claim 9 wherein each adhesive layer has a non-adhesive end portion.
11. An adhesive-type retaining means according to claim 9 wherein said adhesive force of said first adhesive layer and said second adhesive layer are different.
12. An adhesive-type retaining means according to claim 1 having protective means for said first adhesive layer and said second adhesive layer.
13. An adhesive-type retaining means according to claim 3 having protective means for said first adhesive layer and said second adhesive layer.
14. An adhesive-type retaining means according to claim 6 wherein said first adhesive layer has two non-adhesive end portions and said second adhesive layer has one non-adhesive end portion and said first adhesive layer and said second adhesive layer have protective means for said first adhesive layer and said second adhesive layer.
15. The combination of a rigid container, a plastic bag and an adhesive-type retaining means for receiving and securing said plastic bag to a surface of said rigid container wherein said adhesive-type retaining means has a first adhesive layer for adhesive attachment to said plastic bag and an opposing a second adhesive layer for adhesive attachment to said surface of said rigid container, wherein said first and second adhesive layers have different adhesive strengths with the adhesive strength of said first adhesive layer being less than the adhesive strength of said second adhesive layer.
16. An adhesive-type retaining means according to claim 12 for receiving and securing a plastic bag to a said surface wherein said first adhesive layer, two non-adhesive end portions and said second adhesive layer has one non-adhesive end portion and said first and second adhesive layers have non-adhesive protective means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20186894A | 1994-02-25 | 1994-02-25 | |
| US08/201,868 | 1994-02-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2143273A1 true CA2143273A1 (en) | 1995-08-26 |
Family
ID=22747625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2143273 Abandoned CA2143273A1 (en) | 1994-02-25 | 1995-02-23 | Adhesive-type retaining means for thin films |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2143273A1 (en) |
-
1995
- 1995-02-23 CA CA 2143273 patent/CA2143273A1/en not_active Abandoned
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