JPH08190349A - Adhesive tape for label - Google Patents

Abstract

PURPOSE: To provide an inexpensive adhesive tape for labels capable of being continuously cut and maintaining good adhesion strength. CONSTITUTION: This adhesive tape for labels consists of a synthetic resin film base body 11 with specified print or colors applied and an adhesive layer 14 formed on one surface of the base body 11. The base body 11 is produced by laminating a polyethylene film 12 and a polyethylene terephthalate film 13. The adhesive layer 14 is such an acryl adhesive layer that the adhesion strength between this layer 14 and the surface 12b of the polyethylene film 12 opposite to the laminating face is 100-200g/cm. The adhesive layer 14 is formed on the surface 13a of the polyethylene terephthalate film 13 opposite to the laminating face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used, for example, when a product is wrapped in a wrapping paper and then sealed, or when the product is purchased, it is directly attached to the product or a package of the product as proof of purchase. The present invention relates to an adhesive tape, which is used as a so-called label on which a mark such as that of a seller is printed (herein, referred to as "adhesive tape for label").

[0002]

2. Description of the Related Art For example, when shopping at a department store or a supermarket, when a product is wrapped in wrapping paper and finally sealed, a mark including the name of the department store and other patterns is printed, and A colored adhesive tape for labels is used. In addition, wrapping with wrapping paper may be omitted when the item is large, but at this time, in order to prove that you purchased it, cut the label adhesive tape to an appropriate length. In some cases, it may be attached directly.

Conventionally, a cellophane adhesive tape 20 as shown in FIG. 4 is well known as one used for this adhesive tape for labels. This cellophane adhesive tape 20
Is a thin cellophane tape 21 provided with an adhesive layer 22 coated with an adhesive on one surface, and is used for bonding various objects other than the above-mentioned label. As shown in the figure, a release agent layer 23 is formed on the back surface of the cellophane tape 21, which is a base material, by coating a substance having no affinity with the pressure-sensitive adhesive layer 22, that is, a substance having low adhesive strength with the pressure-sensitive adhesive layer 22. It is easy to remove the wound tape.

The adhesive layer 22 is provided on one surface of the cellophane tape 21 via the undercoat layer 24, and the thickness of the adhesive layer 22 is about 10 to 50 μm.
As this adhesive, for example, a mixture of a natural rubber or synthetic rubber elastic material with a softening agent, and a tackifier mixed with an antiaging agent or the like is used.

[0005]

By the way, since the above-mentioned pressure-sensitive adhesive tape for labels is frequently used in sales floors of various products, it is necessary that the cost is as low as possible. However, the cellophane used in the above cellophane adhesive tape 20 is not so cheap as compared with other various synthetic resin films, and in particular, for large chain stores that use enormous amounts of dedicated label adhesive tape. There is a great demand for cheaper adhesive tapes for labels.

As described above, the cellophane adhesive tape 20 has a release agent treatment on the back surface of the tape, and in the wound tape, the adhesive layer 2 is formed on the release agent layer 23.
Therefore, the release agent may be transferred to the pressure-sensitive adhesive layer 22 and the adhesive force of the pressure-sensitive adhesive may decrease with time. further,
Cellophane generally has low moisture permeability and absorbs moisture to deteriorate the initial quality of the adhesive tape, or the tape may be slightly curled during use to affect the workability of application.

On the other hand, as a particularly inexpensive adhesive tape, there is known one in which an adhesive layer is provided on one surface of a substrate made of an oriented polypropylene (OPP) film. Since this OPP adhesive tape is inexpensive, it is widely used as a packaging tape for sealing cardboard boxes.

Therefore, an attempt was made to use this inexpensive OPP adhesive tape as the above-mentioned label adhesive tape. However, in the case of using the tape in a product section, the tape is cut with a cutter such as a saw blade provided on the tape base.
In the case of the P film, the material has a brittle property, and perforated scraps are likely to be accumulated in the cutter, which causes a problem in laminating and cutting the tape, and there is a problem that continuous cutting cannot be performed.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to cut the tape continuously and at the same time to maintain the adhesive strength at a low cost. It is to provide an adhesive tape for labels.

[0010]

DISCLOSURE OF THE INVENTION The present invention for achieving the above object is to provide a pressure-sensitive adhesive for a label, which comprises an adhesive layer provided on one surface of a substrate made of a synthetic resin film which is subjected to predetermined printing or coloring. In the tape, the base material is formed by adhering a polyethylene film and a polyethylene terephthalate film, and the pressure-sensitive adhesive layer is made of a pressure-sensitive adhesive having an adhesion force with the polyethylene film smaller than a predetermined value. The label adhesive tape is provided on a surface different from the adhesive surface of the label.

Further, the pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive layer, and the adhesive force between the pressure-sensitive adhesive layer and a surface different from the bonding surface of the polyethylene film is 100 to 200 g / cm.
Is characterized in that.

[0012]

In the present invention thus constituted, the polyethylene film and the polyethylene terephthalate film, which have different adhesiveness to the pressure-sensitive adhesive layer, are adhered to each other to form a base material, thereby forming the pressure-sensitive adhesive layer. The strength and moisture resistance of the polyethylene terephthalate film with good adhesiveness can be secured securely, and the release agent treatment is eliminated by utilizing the fact that the adhesive strength of the polyethylene film with the adhesive is less than the specified value. The change in the adhesive strength of the pressure-sensitive adhesive layer can be suppressed. Further, since the polyethylene film itself is low in cost, the cost of the pressure-sensitive adhesive tape for labels is greatly reduced.

When this label adhesive tape is used, it is set as a tape winding body, for example, on a tape stand and then pulled by a predetermined length. At this time, the adhesive layer and the base material of the label adhesive tape are used. Since the adhesive strength with the polyethylene film is 100-200 g / cm,
Proper peeling force is obtained, the tape is not too heavy to extend in the length direction or curl in the width direction, and is too light to cause the tape roll to rotate excessively to cause the tape length direction. There is no sagging or not being able to cut.

Next, the label adhesive tape pulled out by a predetermined length is cut by, for example, a cutter of a tape stand. As described above, the peeling force is set to an appropriate level, and the base material has high strength. Since the polyethylene terephthalate film is used, the tape is not curled, and good sticking work can be performed. Moreover, with the base material of the pressure-sensitive adhesive tape for labels of the present invention, it is possible to cut the tape continuously without causing perforations and scratches in the cutter to interfere with the cutting of the tape.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an adhesive tape for labels according to an embodiment of the present invention, FIG. 2 is a perspective view showing a state in which a tape winding body is formed using the adhesive tape for labels shown in FIG. 1, and FIG. It is a figure explaining the use condition of the tape winding body shown by FIG.

As shown in FIG. 1, the label adhesive tape 10 of this embodiment has a base material 11 made of a synthetic resin film.
Is formed by adhering a polyethylene (PE) film 12 and a polyethylene terephthalate (PET) film 13 to each other, and an adhesive layer 14 is provided on a surface different from the adhering surface of the polyethylene terephthalate film 13. . The polyethylene film 12 and the polyethylene terephthalate film 13 are adhered to each other by a method such as a dry laminating method, an extrusion laminating method, and a co-extrusion method.

In a usual adhesive tape, like the above-mentioned cellophane adhesive tape, the back surface of the tape which comes into contact with the adhesive layer when wound is blocked without coating with a silicone-based release agent, for example. Cannot be a tape roll.

On the other hand, in the present embodiment, by adopting the above-mentioned structure, in the case of the tape winding body 15 as shown in FIG. 2, the tape which becomes the contact surface with the adhesive layer is formed. The side surface of the roll is the polyethylene film 12 as shown in the figure. Moreover, as an adhesive of the adhesive layer 14,
An acrylic adhesive was used such that the adhesive strength between this adhesive and the surface 12b different from the adhesive surface of the polyethylene film 12 was smaller than a predetermined value, preferably 100 to 200 g / cm.

Specifically, the acrylic pressure-sensitive adhesive as the pressure-sensitive adhesive of the pressure-sensitive adhesive layer 14 contains a polymer of acrylic acid ester or methacrylic acid ester having an alkyl group having 4 to 12 carbon atoms as a main component, and if necessary, Accordingly, unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, maleic acid monoester, maleic anhydride, itaconic acid, itaconic acid monoester, itaconic anhydride, and acrylic acid esters having a short chain alkyl group. Or methacrylic acid ester; hydroxyalkyl acrylate, hydroxyalkyl methacrylate, vinyl acetate,
It is composed of a copolymer of unsaturated compounds such as diallyl phthalate, acrylamide and methacrylamide, alone, or a mixture of tackifier resins. Those which are crosslinked with a crosslinking agent such as an isocyanate type, a melamine type or a metal chelate type are more preferable, and the requirement of the adhesive strength can be easily satisfied together with adjustment by various additives.

Thus, the adhesiveness of the polyethylene film 12 to the pressure-sensitive adhesive layer 14 is used in reverse, and the same effect as that obtained by the release agent treatment is provided, and the coating of the release agent layer is unnecessary. It was done. As described above, since the back surface of the tape is not treated with the release agent, it is possible to surely eliminate the possibility that the adhesive force of the release agent of the pressure-sensitive adhesive layer 14 causes a decrease in the adhesive force with time. Further, since the release agent treatment is omitted, it is possible to print on the polyethylene film 12 surface with an oil-based pen or the like, and it is possible to appropriately print the product name, the number, the lot number, etc., and use it for a tag label, Further, since the tape surface is less likely to slip, it is suitable for use in packing and for stacking packages.

On the other hand, the adhesive strength between the adhesive of the adhesive layer 14 and the surface different from the adhesive surface of the polyethylene terephthalate film 13 is 370 to 500 g / cm, and it goes without saying that both adhesive surfaces are peeled off during use. There is no adhesiveness. The surface of the polyethylene terephthalate film 13 on which the pressure-sensitive adhesive layer 14 is provided may be subjected to surface treatment such as corona treatment in order to improve adhesiveness.

In this embodiment, the polyethylene film 12 of the base material 11 has a thickness of about 10 μm, the polyethylene terephthalate film 13 has a thickness of about 16 μm, and the pressure-sensitive adhesive layer 14 is set to about 20 μm. There is. Further, as shown in FIG. 1, generally, the contact surface 1 of the polyethylene terephthalate film 13 with the adhesive layer 14
3a, the adhesive surface 13b, or the adhesive surface 12a of the polyethylene film 12 is printed or colored with a mark including the name of the seller or other patterns. In addition,
As described above, the printing is performed on the polyethylene film 1
This is a concept that includes what is printed on the surface 12b different from the second adhesive surface 12b with an oil-based pen or the like.

As shown in FIG. 3, the tape winding body 15 using the adhesive tape 10 for a label constructed as described above is rotatably mounted on the tape base 17 after the support member 16 is fitted therein. Set, a cutter 18 such as a saw blade
It is used while being cut. The reference numeral "ABC" on the tape surface in FIG. 3 indicates a printed mark, for example.

As described above, the polyethylene film 12 has good peelability with the adhesive layer 14 on the back surface of the tape and is inexpensive in terms of material cost. However, if the polyethylene film 12 alone constitutes the base material, Since the tape strength is not high, when the tape is set on the tape stand 17 as shown in FIG. 3 and the tape is pulled, the tape is stretched at the stage of cutting with the cutter 18, and the printed marks are deformed.
The tape has the drawback of curling in the width direction.

In this embodiment, the polyethylene film 12 and the polyethylene terephthalate film 13 are used by being adhered to each other in order to compensate for such a defect. Although the polyethylene terephthalate film 13 has a slightly high material cost, it has high tensile strength and is difficult to stretch, and can sufficiently bear the strength as a tape base material. Therefore, it can be used also for light packaging and has good moisture resistance. Therefore, deterioration of quality due to moisture can be prevented. Furthermore, as described above, the adhesiveness with the pressure-sensitive adhesive layer 14 is also good.

Further, the base material 11 constituted by adhering two kinds of films as described above is the tape base 1 which is usually used.
Even if it is cut by the cutter 18 of No. 7, punching scraps do not occur, and continuous cutting is possible. Further, such a base material 11 ensures appropriate strength and elasticity by appropriately changing the thickness of these films according to the specifications,
It is possible to manufacture at a minimum cost,
The total thickness of the base material 11 can be set to a thickness suitable for the workability of sticking.

Next, the label adhesive tape 10 of the present embodiment.
The case where is used as the tape winding body 15 will be described. For example, as described above, the label adhesive tape 10 is set on the tape stand 17 as shown in FIG. 3, and the label adhesive tape 10 is pulled by a predetermined length L shown by a chain double-dashed line. At this time, since the adhesive force between the pressure-sensitive adhesive layer 14 and the side surface of the tape winding body 15, that is, the polyethylene film 12 of the base material 11 of the pressure-sensitive adhesive tape 10 for labels is 100 to 200 g / cm, an appropriate peeling force is obtained. Is obtained, and the tape does not stretch in the length direction or curl in the width direction because it is too heavy,
There is no possibility that the tape winding body 15 is excessively rotated so that it is slackened in the length direction of the tape or cannot be cut.

Next, the tip end of the label adhesive tape 10 is moved in the P direction shown in FIG. 3 and is cut to a predetermined length L by the cutter 18, but as described above, an appropriate peeling force is set. Since the base material 11 and the high-strength polyethylene terephthalate film 13 are used for the base material 11, it is necessary to cut some of them and temporarily put them on the end of a desk to perform the sticking work at once. However, the tape does not curl so much and can be adhered well. Moreover, as described above, the label adhesive tape 1
Since the film substrate 11 of No. 0 is composed of the polyethylene film 12 and the polyethylene terephthalate film 13, there is no possibility that perforated scraps will be accumulated in the cutter and the stack will not interfere with the cutting of the tape.
Therefore, the tape can be continuously cut. Further, since the acrylic adhesive is used, when the adhesive 18 is cut by the cutter 18 such as a saw blade unlike the rubber adhesive, the adhesive is not cut well and only the adhesive is stretched. Good cuttability from the viewpoint of adhesives.

It should be noted that the embodiments described above are described for facilitating the understanding of the present invention and not for limiting the present invention. Therefore, each element disclosed in the above embodiments is intended to include all design changes and equivalents within the technical scope of the present invention. In the embodiment described above, the polyethylene film 12 and the polyethylene terephthalate film 1 are used as the base material 11.
Although the label adhesive tape 10 of the present invention has been described by taking as an example the one in which 3 and 3 are adhered, the present invention is not limited only to this constitution and there is a difference in adhesiveness with the adhesive layer 14. It is also possible to use one in which other types of synthetic resin films are joined, and for example, instead of the polyethylene terephthalate film 13, another polyester film can be applied.

[0030]

As described above, according to the present invention, a base material is formed by adhering a polyethylene film and a polyethylene terephthalate film, and an adhesive layer has an adhesive force with the polyethylene film smaller than a predetermined value. Since it is composed of an agent and is provided on a surface different from the adhesive surface of the polyethylene terephthalate film, the adhesive layer can be surely provided on the polyethylene terephthalate film having good adhesiveness to secure strength and moisture permeation resistance. By utilizing the fact that the adhesive strength of the polyethylene film with the adhesive is smaller than a predetermined value, it is possible to eliminate the release agent treatment and suppress the change in the adhesive strength of the adhesive layer. Also,
Since the release agent treatment is omitted, it can be printed on the polyethylene film surface with an oil-based pen, etc., it can be appropriately printed and used as a tag label, etc. Moreover, since it is hard to slip on the tape surface, it is suitable for packing It is also suitable for use when stacking packages.

Further, since the polyethylene film itself is low in cost, the cost of the pressure-sensitive adhesive tape for labels can be greatly reduced. Furthermore, when this label adhesive tape is used, it is set as a tape winding body, for example, on a tape stand, pulled by a predetermined length and cut into a predetermined length by a cutter. Since the adhesive strength with the film is set to be smaller than a predetermined value and a high-strength polyethylene terephthalate film is used as the base material, the tape can be curled and a good sticking work can be performed. Moreover, in the base material of the label adhesive tape of the present invention,
It is possible to continuously cut the tape without causing perforation scraps on the cutter to interfere with the cutting of the tape.

The pressure-sensitive adhesive layer is composed of an acrylic pressure-sensitive adhesive layer, and the adhesive force between this pressure-sensitive adhesive layer and the surface different from the bonding surface of the polyethylene film is 100 to 200 g / cm.
Therefore, a more appropriate peeling force can be easily obtained. Also, due to this, the peeling force is too heavy and the tape extends in the length direction or curls in the width direction, or it is too light and the tape roll rotates excessively in the tape length direction. It is possible to more surely avoid the sagging or the inability to cut. In addition, by using the acrylic pressure-sensitive adhesive, only the pressure-sensitive adhesive does not extend when cut, unlike the rubber-based pressure-sensitive adhesive, and the cuttability becomes good from the viewpoint of the pressure-sensitive adhesive.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a label adhesive tape according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state where a tape winding body is formed by using the label adhesive tape shown in FIG.

FIG. 3 is a diagram illustrating a usage state of the tape winding body illustrated in FIG.

FIG. 4 is a cross-sectional view of a conventional adhesive tape for labels.

[Explanation of symbols]

 10 ... Label adhesive tape, 11 ... Base material, 12 ... Polyethylene film, 13 ... Polyethylene terephthalate film, 14 ... Adhesive layer, 15 ... Tape roll, 16 ... Supporting member, 17 ... Tape stand.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display area C09J 7/02 JJJ JJW

Claims (2)

[Claims] 1. A label pressure-sensitive adhesive tape comprising a substrate (11) made of a synthetic resin film which is subjected to predetermined printing or coloring, and an adhesive layer (14) provided on one surface of the substrate (11). Is formed by adhering a polyethylene film (12) and a polyethylene terephthalate film (13), the pressure-sensitive adhesive layer (14), the adhesive force with the polyethylene film (12) is less than a predetermined value The adhesive tape for labels, characterized in that it is provided on a surface (13a) different from the adhesive surface of the polyethylene terephthalate film (13). 2. The adhesive layer (14) is an acrylic adhesive layer, and the adhesive force between the adhesive layer (14) and a surface (12b) different from the adhesive surface of the polyethylene film (12) is 100 ~
It is 200 g / cm, The adhesive tape for labels of Claim 1 characterized by the above-mentioned.