DE1594075A1 - Self-adhesive adhesive material - Google Patents

Description

Patent application

Mr. Ales M. Kapral, Chicago, Illinois (V.St.A.)

concerning

Self-adhesive adhesive material

The invention relates to a self-adhesive or pressure-sensitive one Adhesive material with removable backing layer. In particular The invention relates to the combination between an organic film material coated with an adhesive and a removable organic film material coated with a non-adhesive material (abhesive) as a backing layer.

A self-adhesive or pressure-sensitive adhesive material, such as labels and stickers, generally has an over-

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train of a pressure-sensitive jileb mass on a base material, such as paper or cloth .. To prevent these adhesive materials from sticking together, it is common to use a Protective pad made of paper or cloth on the adhesive layer to apply so it ate is no longer exposed, never an underlayer usually comes with a non-adhesive (.abhesive) Material, for example a combination of polyethylene and a silicone, coated, creating a release surface (release surface) from which the adhesive layer is easily can be removed. This release coating facilitates removal on the pad before applying the adhesive a suitable surface.

In the manufacture of pressure sensitive or self-adhesive tapes adhesive material with backing layers, it is common that to cut pressure-sensitive or self-adhesive material so that its surface is slightly smaller than that of the base material. In this way, exposed areas of the backing or peelable layer are obtained that can easily be covered with the Jj'ingern or otherwise grabbed and by the pressure-sensitive or self-sealing adhesive material can be removed. However, if you cut the adhesive layer and the backing layer in one operation, you get a sharp hand, which you can practically not penetrate if you wants to separate the backing layer from the adhesive layer.

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For this reason it was customary to use a foil or sheet (e.g. paper) with a pressure-sensitive or self-adhesive Adhesive coated and to which a backing material provided with a release layer was applied to cut very sharp tools that only go through the web coated with the pressure-sensitive adhesive, i.e. through the paper or cloth, and the adhesive layer on it passed through while the backing material and the layer of release material (polyolefin silicone resin) applied to it was not cut through. In addition, the backing material is usually cut parallel to its surface or split so that it can be removed.

This way of working not only requires extremely sharp tools, but also a careful adjustment of these tools so that only part of the foil material and not too the rest is cut through. This is how the manufacture of labels, stickers and other relatively small self-adhesive films extremely expensive.

One purpose of the invention is to provide sheet material consisting of a self-adhesive or pressure-sensitive one Adhesive material and a backing material that is compatible with ordinary Tools for labels, stickers or similar items can be cut, of which the backing is proportionate can be easily removed.

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Another purpose of the invention is to provide sheet material, Consists of a self-adhesive, pressure-sensitive adhesive layer and a backing film, which is lightweight can be peeled from the adhesive layer without the need for cleaving or cutting parallel to the surface is.

Another purpose is the creation of foil material a pressure-sensitive adhesive layer and a backing sheet, that can be cut on conventional cutting devices.

Another purpose is the creation of foil material a pressure sensitive adhesive layer and a backing sheet , that with the help of ordinary printing devices can be printed.

Another purpose is to create foil material with a pressure-sensitive adhesive layer and a backing sheet, that can be stored for a long time and that does not become wavy or lose its adhesive properties as it ages.

Another purpose is to provide a method for making this material.

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Tucks and other purposes can be achieved with the help of the invention as can be seen from the description below.

It has been found that foil or sheet material which is coated with self-adhesive or pressure-sensitive adhesives, together with backing foils of creped, crimped, wrinkled, folded, wavy, embossed or embossed material forms a combination, the adhesive layer of which makes the backing foil easily by simply rubbing , Bending, stretching or pressing can be removed; for example, the backing sheet can simply be stretched or stretched over the self-adhesive part, thereby forming a tab or protrusion that can easily be grasped to remove or peel the backing sheet from the self-adhesive adhesive layer. According to the invention, it is possible to cut the self-adhesive element and the backing sheet to the same size in one operation, and it is not necessary to use the expensive and complicated cutting processes that have been customary up to now.

-The invention is linked by the following description explained in more detail with the accompanying drawing.

In the drawing:

ii'igur 1 is a plan view of a band of self-adhesive labels According to the state of the art}

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FIG. 2 shows a longitudinal section through a band of self-adhesive labels along the line 2-2 of FIG. 1;

Jiigur 3 is a perspective view of a known self-adhesive Material with underlay film, the underlay film being cut to the same size as the self-adhesive material;

Figure 4 is a perspective view of a tape of self-adhesive adhesive paper with a crepe paper backing for explaining the invention;

Figure 5 shows the creped backing sheet of Figure 4 after stretching into a tab or protrusion to separate it from the self-adhesive Remove material;

FIG. 6 shows a perspective view of a further embodiment of the invention, on the base layer of crepe paper a smooth sheet of paper is applied with a coating of glue or other adhesive; and

FIG. 7 shows another perspective view of the embodiment see figure 6.

Regarding the guard parts of known self-adhesive material in combination with removable underlay parts is on

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Reference is made to i'igur 1, in which such self-adhesive labels 10 are indicated on a strip-shaped base material 11. As indicated in Figure 1, the self-adhesive labels individually cut so that-they are easily removed from the backing material can be detached or removed.

According to iJ'igur 2, the paper labels 10 are over the layer 12 From self-adhesive adhesive connected to the base material 11, one side with a thin coating 14 from Paper web 13 provided with polyethylene and silicone represents. Of the Polyethylene silicone coating 14 forms a release layer which the self-adhesive adhesive 12 adheres only slightly. For this reason, the self-adhesive adhesive layer 12 can be easily peeled off the release liner 14 revealing the adhesive layer and the label on a suitable object can be attached.

During the production of the labels shown in FIGS. 1 and 2, a 'more or less continuous paper web 13 coated on one side with polyethylene as a base, after which a silicone coating for the purpose of forming the release layer 14 is applied. At the same time, a continuous paper web is coated with a self-adhesive adhesive 12, and the two coherent webs then become a coherent multilayer material in a manner known per se, as indicated in Figure 3, connected, the

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self-adhesive adhesive sends 12 with the release liner 14 in Touch stands. This continuous web is then passed through a cutting device in which the tools are so arranged are that they are the paper layer 10 and the layer of self-adhesive or pressure-sensitive adhesive, but do not cut through the release layer 14 or the underlay material 13. That way you get labels like them are given in i'igur 1. It is easy to see that this Process is expensive and complicated, particularly in terms of the construction and operation of the cutting device, with the help of which the individual labels 10 are cut.

According to the invention, the complicated cutting process that is used for producing the labels of the type specified in ü'igur 1 and 2 can be used Kind is required to be avoided. Jüach i'igur 4 this desired goal is achieved by making a continuous web or tape of paper 21 covered with a self-adhesive or pressure sensitive adhesive layer 22 is coated with a continuous web or tape 23 is connected from crepe paper, one side with a thin layer 24 of release material (abhesive), for example a Combination of polyethylene and a silicone resin, is coated. The coated paper web and the coated Crepe papers have been bonded together so that the adhesive 22 is in contact with the release liner 24, awake

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FIG. 4 there are spaces 25 between the flat adhesive layer 22 and the wavy release layer 24.

As indicated in ü'igur 5, the backing material made of crepe paper 25 and the release layer 24 arranged thereon are laterally stretched or stretched, forming a tab or projection 26 over the paper 21 and the self-adhesive end Adhesive layer 22 extends out. That way you can the backing material 23 and the coating applied thereon Take hold of release resin 24 so that the connection between the base and the self-adhesive adhesive 22 can be easily loosened can.

In the foregoing it is indicated that the web material 21 and the creped material 23 are made of paper. These materials can also consist of cloth, random nonwovens, metal foils, plastic foils, wood veneer and the like. Instead of crepe paper, any crimped or embossed material can be used, as long as the surface of the release layer 24 in contact with the self-adhesive or pressure-sensitive adhesive 22 forms spaces 2b , as shown in FIG. 4, so that the base part, ie the combination 24 and 2i ?, can be stretched or otherwise deformed and a protrusion over the adhesive layer 22 is formed.

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The self-adhesive or pressure-sensitive adhesive can be made from consist of a known substance with suitable adhesive properties. For example, rubber-resin adhesives, Silicone rubber adhesives (e.g. the silicone rubber "Silastic" from Dow Corning Corporation), adhesives chlorinated rubber, vinyl ether resins, acrylic resin-rubber latex combinations and similar adhesives can be used. These and other suitable pressure sensitive adhesives are in U.S. Patents 2,814,601 to Currie et al. (November 26th 1957), 2,816,348 from Adamik (December 17, 1957) »

2,857,356 of Goodwin (21 October 1958), 2,882,182 Bond

et al. (April 14, 1959), 3,161,533 to Gaynes (December 15, 1964),

3,189,581 to Hart et al. (June 15, 1965), 3,197,326 to Webber (July 27, 1965), 3,197,330 to Barteil (July 27, 1965) and 3,179,552 from Hauser (April 20, 1965) and those cited there Patents specified.

The backing or release film is covered with a thin layer covered from a material that does not adhere to the adhesive layer adheres.

This material is called "non-adhesive" (abhesive) because its properties are the exact opposite of adhesive bonds are. The preferred non-adhesive is polyethylene, which

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is covered with a silicone, but polyethylene is alone and silicone alone are also suitable. Other suitable bonding adhesives are polypropylene, polyvinyl alcohol, polyvinyl acetate and similar polyalkenyls and vinyl polymers *

Underlay film is never coated with the release layer made of the non-adhesive and then creped, crimped, embossed or treated in a similar way in the dry state. The backing material is preferably creped to a contraction of 10 to 15 %. However, a contraction of up to 50% is also permitted.

According to a preferred embodiment of the invention, a backing paper with an initial weight of about 4.54 to 36.3 kg / fiies (10-80 lbs / ream) is used, which is about 0.454 to 4.54 kg / hies on one or both sides per side U - 10 lbs / ream) polyethylene is coated, which in turn is coated on each side with about 0.00454 to 0.908 kg / gravel (0.01 to 2 lbs / reamj cured solid dimethy lpolysiloxane. Then it is coated on no more than 50 fi of its original width creped or embossed.

The release layer usually consists of having bilikon coated paper, generally of parchment paper and filled with clay strongly rolled kraft paper. The paper can be in front of the

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Treatment with the silicone coated with polyethylene. A good release paper should have a release value of about 7.8 g / cm (50 g / sq. In.) According to the wedge test.

According to a further embodiment of the invention (see FIG. 6), the creped backing layer 23 is coated with a web 28 of a material with a smooth surface, for example calendered paper, which is coated with glue or another suitable adhesive to form a sandwich structure is being held. This arrangement provides two smooth surfaces for printing, if desired, and is a more rigid and less pliable material. Such a material is often desirable for cardboard, for example. i) The creped base oil 23 can still be peeled off the layer of self-adhesive adhesive 22.

FIG. 7 shows the sandwich structure of FIG. 6 after it has been subjected to pressure, for example in a calendering machine. The adhesive layer 22 is around the corrugations in the with a thin layer 24 of polyethylene and silicone covered crepe paper 23 flowed downwards. The crepe paper is thereby firmly anchored in the adhesive 25 and withstands printing, cutting, trimming and the usual Handling a lateral movement. The underlay film 23

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and the release layer 24 can easily be peeled off or removed from the self-adhesive or pressure-sensitive adhesive mass 22 by bending over a corner of the sandwich structure, for example a label, which, as a result of influencing the radius of the composite film, causes a layer to protrude somewhat and thus can be easily grasped for removal "

From iigur 7 it can be seen that the pressure sensitive adhesive testers or pockets in which the waves of the crepe web 23 are partially embedded. This arrangement is a preferred one Embodiment is, especially if the web material is to be printed without the base or the release film 23 peeled off. The best results are obtained when the waves are about a quarter to half of their Height are embedded in the adhesive layer, although the product is also satisfactory if the waves are 1/10 are embedded up to 2/3 of their height.

The height of the waves in the creped or rippled i'olie 23 is preferably about 1 mm, although it can vary from 0.1 to 3 mm. Smaller waves prevent sideways Usually no movement. Large waves sometimes make printing on the exposed surface of the Ji'olie 21 difficult.

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The shape of the waves in track 23 is sometimes important. in the Crepe paper these waves are usually disjointed, like that that the channels or valleys in between are not interrelated “This form is desirable because it allows air to penetrate into the layer material, which leads to aging of the adhesive would prevent. That too will penetrate prevented from dust and moisture. Of course, even waves are also possible, for example at Corrugated paper, useful with connected valleys. Although air, moisture and dust on the adhesive layer can reach, this is not necessarily disadvantageous in many types of application if the material is not stored for too long will.

In the embodiment according to Figure 7 there are about 15 to 35 # the surface of the adhesive layer 22 with the coated crepe paper 23 and 24 or a similar material in contact. If the stripping layer is in the dry state creped paper, only about $ 30 of the area of the pressure-sensitive adhesive is exposed to the coated side of the crepe paper in contact. The adhesive surface in contact with the coated crepe paper is advantageously kept as small as possible, since the silicone, which is usually a component of the release layer, has the tendency to become in migrate the adhesive into it and shorten its lifespan.

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According to the invention, the contact area between adhesive and silicone is usually about 70 fo smaller than in the case of the known pressure-sensitive, adhesive-coated films.

If, in the embodiment indicated in FIG. 7, the backing or release layer is removed from the adhesive layer, this is expediently done by bending the film material in the direction of the backing or release layer. Because of the great thickness of the composite film, the backing or release film 23 has a different radius of curvature than the film 21, which is coated with the pressure-sensitive adhesive. Causes the difference in the radii of curvature of the two sheets, that the sheets are pulled apart when bending.

It has been found that the paper products produced according to the invention particularly desirable as a printable material for labels, cards, signs and similar items are. Larger foils or sheets, such as wallpaper, can also be produced in this way. The pressure is on these Products are particularly sharp and clear, and the opacity is excellent. The printed material is more evenly dark and denser than similar paper without the creped or corrugated layer. Furthermore, these paper products easier to cut than ordinary glue-coated

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tete paper products. Batches from such paper products can Cut cleanly with "guillotine-like" cutting devices, since the knives are clean even with repeated cutting stay and do not stick the sheets of paper on top of each other. On the other hand, you have to do the usual pressure-sensitive jileb papers clean the knives often, to remove aen glue, and the hands of one on top of the other Leaves stick together, making it difficult to separate them.

.Patent claims

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Claims (17)

Claims 1. Self-adhesive iLLebmaterial, characterized by a film or web layer, a layer attached to it made of self-adhesive adhesive, a release layer in contact with the adhesive layer and a stretchable one Underlay film connected to the release layer, the release layer being the surface of the stretchable Underlay film aligns. 2. Self-adhesive adhesive material according to claim 1, characterized in that that the insulating layer and the backing film made of paper. 3. Self-adhesive adhesive material according to claim 1 and 2, characterized characterized in that the underlay film is made of crepe paper consists. 4. Self-adhesive adhesive material according to claim 1, characterized in that that the release layer is made of polyethylene. BATH ORIGINAL 5. Self-adhesive adhesive material according to claim 1 and 4, characterized in that the release layer consists of polyethylene coated with silicone. 6. Self-adhesive adhesive material according to claim 1, characterized in that that the film or web layer consists of cloth and the backing film of crepe paper. 7. Self-adhesive adhesive material according to claim 1, characterized in that the adhesive is pressure sensitive. 8. Self-adhesive adhesive material, characterized by a film or web layer, a layer applied thereon made of self-adhesive adhesive, a release layer in contact with the adhesive layer, a stretchable one backing film connected to the release layer, the release layer being the surface of the stretchable Underlay film adjusts, and a second film layer, which on the side facing away from the release layer with the stretchable backing film is connected. 9. Self-adhesive adhesive material according to claim 8, characterized by that the film layer and the backing film made of paper beatehen. BATH ORIGINAL 10. Self-adhesive adhesive material according to claim 8 and 9 »thereby characterized that the underlay film made of crepe . paper is made. 11. Self-adhesive adhesive material according to claim β, characterized in that that the release layer is made of polyethylene. 12. Self-adhesive .Klebmaterial according to claim 8, characterized in that that the adhesive is pressure sensitive. 13. Removable film for pressure sensitive adhesives, thereby characterized in that it consists of stretchable material coated with a layer of jjiichtklebstoif (abhesive) is. 14. Removable film according to claim 13, characterized in that it consists of crepe paper. · Removable film according to claim 13, characterized in that the multi-layer adhesive is a polyalkylene. 16. Removable film according to claim 15 »characterized in that that the polyalkylene is polyethylene. 17. Removable film according to claim 16, characterized in that that the polyethylene is coated with a silicone resin. . BAD ORiC.M * 1. ^R / ^m 0 0 9 8 3 2/1507 , ^Ζ0 > Blank page COPY