JPS60172668A - Tape for packaging - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a packaging tape, and particularly to a self-adhesive tape that exhibits pressure-sensitive adhesive properties only between both sides of a tape base material and does not substantially exhibit adhesive properties to other objects. The present invention relates to a packaging tape on which an adhesive layer is formed.

Generally, when wrapping or binding items using plastic tapes or strings made of polyethylene, polyvinyl chloride, etc., the binding force for the items depends solely on the contact friction with the item surface. In order to ensure secure packaging without loosening, uniform tension is always applied during work, and while this binding force is maintained, it is complicated to secure the end of the tape or form a knot in the string. processing is required.

Therefore, if a so-called pressure-sensitive adhesive tape is used for such purposes, the labor required for the work can be significantly reduced due to the excellent adhesion of the adhesive layer to the surface of the article.

However, the strong tackiness of such adhesive tapes may not necessarily be desirable depending on the article to be packaged and the purpose of the work.

For example, when temporarily binding or sealing two bundles of documents or a cardboard box with adhesive tape, it becomes very difficult to remove the tape from the surface of the item later, and when removing the tape, Displays such as printed characters and designs on the surface of the article, and in some cases the surface of the article itself, were stuck to the tape and peeled off. In addition, dust may adhere to the adhesive that remains on the surface of the product after the tape is removed, staining the surface of the product and damaging its appearance.

In view of the above, the present invention allows articles to be wrapped or bound with strong binding force by simply wrapping it around articles in the same way as conventional adhesive tapes, and unlike conventional adhesive tapes, it is possible to wrap or bind articles with IW.
A packaging tape that can be removed at any time during wrapping without damaging or staining the surface of the product, and is printed with various patterns in two colors, etc., and is extremely suitable for wrapping or bundling products. The purpose is to provide tapes for

To achieve this objective, the present invention provides a tape substrate consisting of cellophane or a plastic film, on at least one side of which a printing ink having a vehicle resin with good adhesion to the tape substrate is applied and dried. An ink film is formed, and then rubber latex and a water-soluble adhesive are applied to at least 0.48 to 1.8 g of the surface of the ink film.
A self-adhesive layer is formed by applying and drying an aqueous solution uniformly mixed with an adhesive/latex weight ratio within a range of 0.

Embodiments of the present invention will be described below based on the drawings.

FIGS. 1 and 2 are a perspective view and a sectional view taken along the line III-111 of the packaging tape according to the present invention, respectively.

In the figure, 1 is a tape base made of cellophane or a plastic film such as polyethylene, polyester, polypropylene, etc., 2 is an ink film formed by applying and drying printing ink on the back side of the tape base 1, and 3 is a tape. Transparent ink films 4 and 4 are formed by applying and drying the above-mentioned printing ink components excluding the coloring material on the surface side of the base material 1. Rubber latex and 4 are formed on the ink films 2 and 3, respectively. This is a self-adhesive layer formed by applying and drying an aqueous solution in which a water-soluble adhesive is uniformly mixed at a predetermined adhesive/latex weight ratio.

Here, among the Plus Deck films used for the tape base material 1, for polypropylene, polyethylene, etc., which have relatively poor adhesion to printing ink, consider the anchoring properties (described later) of the self-adhesive layers 4, 4. The adhesion of the printing ink to the tape base material 1 is improved in advance by treating the surface with gas flame, corona discharge, etc., or by coating the surface with polyvinylidene chloride resin, etc., before applying the printing ink. put.

Note that the polypropylene used for the tape base material 1 according to the present invention includes biaxially oriented polypropylene (CPP),
Examples include non-oriented polypropylene (CPP).

The composition of the printing ink applied to the tape base material 1 is a general basket, a coloring material as a coloring component, and a component for forming ink films 2 and 3 by spreading the coloring material onto the tape base material 1 surface. A certain vehicle (Vel+1cle), a dispersant, an antifoaming agent,
It consists of three components, including an auxiliary agent such as a plasticizer, but in the present invention, in consideration of the anchoring properties of the self-adhesive layer 4.4, the tape base material It is necessary to select a vehicle that has particularly good adhesion to No. 1.

For example, the vehicle for gravure ink consists of a resin and a solvent, and nitrocellulose (nitrified cotton) is a vehicle resin that has good adhesion to the above-mentioned tape base +4'1 and has a high ability to form an ink film.

Examples include ethyl cellulose, polyamide resin, vinyl chloride/vinyl acetate copolymer resin, polyvinyl butyral, acrylic resin, polyurethane, and polyester. Among printing inks that have good adhesion to the tape substrate 1, two-component reactive printing inks that use a resin having a reactive group as a vehicle are one of the two components used to form an ink, and the other as a curing agent. The ink film obtained in this way is extremely tough and has excellent durability, making it very suitable as a printing ink for use in the present invention. Examples of such two-liquid reactive printing inks include polyurethane resin-based gravure inks and screen inks using epoxy-based, melamine-based, and other resins as vehicles.

The tape 1' of the present invention shown in FIGS. 1 and 2 has ink coatings 2 and 3 formed by applying printing ink containing a vehicle resin as described above to a tape base material 1 and drying it.
Add rubber latte nox and water-soluble adhesive to the surface of
．． A self-adhesive layer 4, 4 having a thickness of, for example, about 0.005 to 0.02 m is formed by applying and drying an aqueous solution uniformly mixed with an adhesive/latex weight ratio in the range of 48 to 1.80. There is.

Here, the self-adhesive N4 exhibits pressure-sensitive adhesion only between themselves and has the characteristic that it does not substantially adhere to other objects.

Rubber latex as the first main component forming this self-adhesive layer 4 is a component for imparting self-adhesiveness that allows bonding only between the self-adhesive layers 4, while rubber latex as the second main component The water-soluble adhesive is a component for bonding the self-adhesive layer 4 to the ink coatings 2 and 3 of the tape base material 1 to provide anchoring properties, and also dries and solidifies in the self-adhesive layer 4. By forming a portion that does not contribute to the adhesiveness of the adhesive layer 4 in any way, it acts to reduce the adhesiveness of the adhesive layer 4 caused by the rubber latex.

Then, by selecting the amount of the rubber latex and water-soluble adhesive to be used within the range of 1:0.48 to 1.80 expressed as a weight ratio of the water-soluble adhesive to the rubber latex, the self-adhesive layer 4 and 4 have sufficient adhesive strength between each other, and have the characteristics of not substantially adhering to other objects.

Note that when this weight ratio is 0.48 or less, the rubber latex content becomes excessive and the ink coatings 2 and 3 of the tape base material 1 are
The adhesion to the material decreases, causing peeling.
．． If it exceeds 80, it becomes impossible to obtain sufficient adhesive strength between the self-adhesive layers 4 and 4 due to a relative decrease in the rubber latex content.

Here, as the rubber latex, for example, natural rubber latex or synthetic rubber latex such as styrene-butadiene rubber, nitrile rubber, polychloroprene rubber, polyisoprene rubber, etc. can be used. The water-soluble adhesive may be a conventional adhesive that does not exhibit good anchoring properties to the ink coatings 2 and 3 of the tape substrate 1, such as an acrylate-1-based or vinyl acetate-based water-based emulsion adhesive. Alternatively, polyvinyl alcohol or the like can be used.

By the way, the self-adhesive IFi4 formed as described above
, 4 is different from the adhesive layer in conventional printed adhesive tapes, it has been found through experiments by the present inventor that it directly anchors to the ink coatings 2 and 3 of the tape base material 1 and exhibits strong adhesion.

Therefore, in the tape T of the present invention, a primary coat is separately applied between the ink film and the adhesive layer as in the conventional printed adhesive tape, and the ink film and the adhesive layer are firmly anchored to each other via the primary coat. There is no need to worry about having to wear it.

In other words, in the tape T of the present invention, the ink films 2 and 3 fully fulfill the role of the undercoat layer in a normal adhesive tape, and therefore the ink films 2 and 3 serve as the undercoat layer with the self-adhesive layers 4 and 4. It is firmly adhered to the tape base material 1 via the tape and has strong anchoring properties.

The above is the basic configuration of the packaging tape according to the present invention,
Next, its effect will be explained.

FIG. 3 is a perspective view showing an example of the use of the packaging tape T according to the present invention, and 5 in the figure is a cardboard box to be packaged.

With ordinary adhesive tape, packaging or sealing effects can be obtained by adhering the adhesive layer formed on one side to the surface of the cardboard box 5, but the present invention [JH
In this packaging tape T, a tape base material 1 on which self-adhesive layers 4, 4 are formed on both sides is wound around the surface of a cardboard box 5, and the self-adhesive layer 1 formed on the front and back surfaces of the tape base material 1 is wound around the surface of a cardboard box 5. The binding force of the packaging container is obtained by pressing the layers 4.4 with their overramp portions 6 into a pressure-sensitive adhesive bond to each other.

Here, the overlamp part 6 of self-adhesive N4.4 is on the order of Kg (approximately 1 to 6 kg>
Since the adhesive strength is obtained, a firm packaging state is reliably maintained, and no loosening occurs over a long period of time as in the case of conventional adhesive tapes.

Then, at the time of W release, the tape T is peeled off from the terminal end in the opposite direction to that during winding, but at this time, the self-adhesive layers 4, 4 pressure-sensitively bonded to each other have almost no resistance in the peeling direction. (resistance of about 100 to 400 g), and since the self-adhesive layer 4 in contact with the surface of the cardboard box 5 does not adhere to the surface of the cardboard box 5 at all, unlike conventional adhesive tapes, the adhesive tape does not adhere to the surface of the cardboard box 5. It can be removed very easily and smoothly from the surface of 5 without staining or damaging the surface.

As described above, the packaging tape T according to the present invention has features not found in conventional adhesive tapes, and also has an ink coverage of 1*
2, various patterns, one color, two letters, etc. are printed,
Since the printed display, etc. appears through the tape base material 1, the transparent ink film 3, and the self-adhesive N4 formed on its surface, the color tape has unprecedented new usefulness and can be used for documents such as slips, etc. It can be widely applied to temporary binding of bundles and textile products, packaging of calendars and drafting paper, etc.

Hereinafter, specific and optimal embodiments of the packaging tape according to the present invention will be described.

First, a non-stretchable biaxially oriented polypropylene (OPP) is used as the tape base material 1, and before printing, both sides of the tape base material 1 are modified by corona discharge treatment or plasma treatment. Make the surface easy to adhere to.

A two-component reactive gravure ink containing Polyurekne resin as a vehicle is prepared as a printing ink to be applied to the tape base+AI.

This polyurethane resin-based gravure ink is made of vinyl chloride/vinyl acetate copolymer resin and polyester polyol that have functional groups such as hydroxyl groups.

This is an ink that is made from polyether polyol, etc., and then reacted and cured by adding isocyanate prepolymer (curing agent) at the time of printing.
Printing is performed by mixing liquids, and after printing, a reaction occurs following evaporation of a solvent such as alcohol, resulting in curing.

Here, the gravure ink having a desired coloring material such as a pigment or dye is applied to the back side of the tape base material 1.
The gravure printing machine then prints, applies and dries an ink consisting only of a vehicle and an auxiliary agent, excluding the coloring material from the gravure ink, on the surface side of the gravure ink. This results in
An ink film 2 having a predetermined lateral pattern and a transparent ink film 3 are formed on both sides of the tape base material 1, respectively.

Then, the tape base material 1 on which the ink films 2 and 3 have been applied and formed is placed in a drying oven and dried by heating at a temperature of about 40° C. for about 24 hours to further accelerate the reaction. With each step, ink films 2 and 3 that adhere extremely strongly to the surface of the tape base material 1 and are tough are obtained.

Next, a 41.3% aqueous emulsion (solid content concentration 46%) of a copolymer resin mainly composed of methyl methacrylate and butyl acrylate as a water-soluble adhesive component,
Aqueous ammonia solution with 20.7% water and 28% concentration 1.7
%, and the mixed liquid contains 33.1% natural rubber latex as a rubber latex component (solid content approximately 6%).
0%) and 3.3% (solid content concentration approximately 44%) of a wetting agent mainly composed of sulfosuccinate esters to prepare an aqueous solution for forming the self-adhesive layer 4 (adhesive/
Latex weight ratio: 0.95/1).

Then, the aqueous solution prepared in this way is uniformly applied to both sides of the tape base material 1, on which the ink films 2 and 3 are formed as described above, while being transported at the required speed, and dried to a thickness of approximately A self-adhesive layer 4.4 of 0.006 mm is formed.

Next, on the surface of the self-adhesive layer 4.4, fine silica particles with a purity of 99.8% or particle size 10 are applied as an anti-blocking agent.
After applying blocking treatment such as cornstarch made of corn starch with a particle size of about 25 microns, this is wound up into a paper tube.

The tape completed as described above and wound around a paper tube is cut along with the paper tube to a required width to complete a packaging tape T (shown in Figure 1) having a width of 181 m.

The two samples cut from this tape T were superimposed one on top of the other, and the self-adhesive N4 was pressure-sensitively bonded to each other (longitudinal overlap amount 10M), fixing the free end of one sample and fixing the free end of the other sample. Tension was applied along the longitudinal direction of the tape from the free end side. The average adhesive strength between the self-adhesive layers 4.4 in this horizontal peel test was approximately 6.
It was 0 kg. Next, when a peeling tension in a direction perpendicular to the tape surface was applied to one adhesive end of the overlamp part of the samples mutually adhered in the same manner, the average resistance was approximately 240 g. there were.

As described above, in the packaging tape T according to the embodiment, the tape 1 is made of water-resistant polypropylene, and the ink film 2 on which the desired printing is applied is formed on both sides. Since the tape is formed with self-adhesive layers 4, 4 that exhibit pressure-sensitive adhesiveness only on the tape and do not adhere to other objects, it is extremely suitable for use as a vegetable binding tape on which, for example, the producer's information is printed.

In particular, since the self-adhesive N4, 4 formed as described above does not adhere or adhere to the vegetables to be bound, not only will the vegetables not be damaged when the tape is peeled off, but the self-adhesive N4,4 It has the excellent property of reliably self-adhering even if the surface is wet due to adhesion of water droplets, etc., and unlike conventional adhesive tape for binding vegetables, the adhesive force of the adhesive layer itself is imprinted on the tape surface. Unlike those that do not adhere to vegetables by reducing the adhesive strength to a level where it barely adheres, the tape T exhibits a strong adhesive force on the order of Kg at the overlamp part 6, so it has an extremely strong binding force.

Further, the adhesive strength between the self-adhesive layers 4, 4 is very strong at about 6 kg in the horizontal direction, but the adhesive strength between the self-adhesive layers 4, 4 and the ink films 2 and 3, and the ink film 2 Since the adhesive force between 3 and 3 and the tape base material 1 is even stronger, the anchoring ability of the self-adhesive layer 4.4 to the tape profiteer 1 is extremely strong.

Therefore, when unwinding the packaging tape T wound around the paper tube 7 (shown in Figure 1), or when peeling off the Ohara knob portion 6 (shown in Figure 3) of the packaging tape T used for packaging articles. When doing so, the adhesive force between the self-adhesive layers 4, 4 may cause the self-adhesive layers 4, 4 themselves to peel off from the ink coatings 2 and 3, or to peel off from the tape base material 1 together with the ink coatings 2 and 3. do not have.

In addition, since the ink films 2 and 3 directly serve as an undercoat layer for the tape 1 for the self-adhesive layer 4.4, a separate primary layer is added between the ink film and the adhesive layer as in conventional printed adhesive tapes. There is no need to apply a coating or the like, and it can be manufactured easily.

In addition, in the above-mentioned example, a case was described in which a gravure ink containing a desired coloring material is applied to one side of the tape base material 1, and a transparent gravure ink containing no coloring material is applied to the other side. However, the present invention is not limited to this, and printing ink such as gravure ink having a desired coloring material may be applied to both sides of the tape base material 1 to differentiate the colors.

Further, printing ink is applied and dried on only one side of the tape base material 1 to form an ink film 2, and a self-adhesive layer 4 is formed on the surface of the ink film 2, and a normal undercoat layer is formed on the other side. The self-adhesive layer 4 may be formed on the surface of the undercoat layer.

In addition, so-called moisture-proof cellophane tape (manufactured by Tokyo Cellophane Co., Ltd.:
When using MST #400), printing ink is applied and dried only on one side to form an ink film 2, and a self-adhesive layer 4 is formed on the surface of the ink film 2.
On the other side, a self-adhesive layer 4 can be directly formed via the moisture-proof layer. This is because the moisture-proof layer acts as an undercoat layer for the self-adhesive N4, and
This is because it can impart Q1fii properties.

Further, in the above-mentioned embodiment, a case was explained in which the self-adhesive layer 4 was formed on both sides of the tape base material 1, but the present invention is not limited to this. The self-adhesive layer 4 may be formed only on the surface of the coating 20. In this case, the tape base material 1 is formed relatively wide and folded in two with the four self-adhesive layers facing inside, and the object to be packaged, such as a flat lithium battery or plant seeds, is placed between the two. By adhering the opposing side edges of the tape to each other, a simple package can be obtained in which the packaged item is sealed with the packaging tape T itself.

As described above, according to the present invention, when wrapping and binding articles, it is possible to obtain the same simple and reliable wrapping and binding effects as with conventional adhesive tapes, and when unwrapping or untying the goods, can be quickly and easily removed from the surface of the article by simply peeling off the overramp portion of the tape, just like untying a string.

In addition, the packaging tape according to the present invention takes advantage of the property that it does not substantially adhere to other objects, thereby preventing damage to the surface of the object when the tape is removed when conventional adhesive tape is used.
It can also be applied to packaging and bundling paper products, textile products, etc., where staining has been a problem.

Furthermore, the packaging tape according to the present invention has the excellent effect that it can be used as a simple packaging body on which a desired printed display is applied.

[Brief Description of the Drawings] Fig. 1 is a perspective view of a packaging tape according to the present invention, Fig. 2 is a sectional view taken along the line mm, and Fig. 3 is a perspective view showing an example of the use of the packaging tape according to the present invention. It is. Explanation of symbols T---Packaging tape, 1-Tape base material, 2.3--Ink film, 4-Self-adhesive layer, 5-1 Cardboard box, 6-Overlamp portion, 7-Paper tube.

Claims (1)

[Claims] On at least one side of a tape base made of +11 cellophane or plastic film, a printing ink having a vehicle resin with good adhesion to the tape base is applied and dried to form an ink film. Then, at least on the surface of the ink film, an aqueous solution containing a uniform mixture of rubber latte, Nox, and a water-soluble adhesive at an adhesive/latex weight ratio within the range of 0.48 to 1.80 is applied and dried to form a self-adhesive layer. A packaging tape characterized by forming. (2) The packaging tape according to claim 1, wherein one of the printing inks applied to both surfaces of the tape base material is a printing ink that does not contain a coloring material. (3) The packaging tape according to claim 1, wherein the printing ink is a two-component reactive gravure ink based on polyurethane resin.