JP2003330371A - Easily tearable adhesive label - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tacky adhesive label which is easily tearable by the force of fingers from any segments of end edges despite irregular shapes. <P>SOLUTION: The tacky adhesive label consists of at least a synthetic resin film as its component is formed by applying a multiplicity of fine scars over the entire surface of the synthetic resin film. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive label used for stopping the lid of a food or non-food paper or plastic molded container, or for stopping a package wrapped with a sheet of paper or film. The present invention relates to an easily tearable adhesive label that can be torn from any edge of the label.

[0002]

2. Description of the Related Art Generally, soft foods such as cakes and Japanese sweets are sold in a molded container or bag made of paper or plastic. In this case, the lid of the container and the body and the opening of the bag are stopped with an adhesive label so that the lid of the container and the mouth of the bag are not opened during transportation and storage of the container.

[0003]

However, when the container or bag is opened, the adhesive label is peeled off or pulled because it is stopped across the container lid and the main body, the folding opening of the bag and the bag body. It is necessary to tear it, but in this case the adhesive label made of synthetic resin film is hard to tear because the strength of the synthetic resin film is strong and if you try to force it by hand, the label will be cut or peeled suddenly. In some cases, the stored items popped out or the container was damaged and the stored items were crushed. As a method of making an adhesive label easy to tear, Japanese Patent Laid-Open No. 2001-188473 discloses a so-called gather cut label sheet in which a concave portion and a convex portion are alternately formed a plurality of times at a predetermined portion of an edge portion.

In this case, the label may be punched out by making the design of the edge part of the die cutter of the label cutting device uneven, but the defect that the shape of the die cutter becomes complicated and the unevenness of the edge is the design of the label. Sometimes it didn't match. Further, Japanese Patent Laid-Open No. 2001-180747 discloses a label sheet having a plurality of fine holes or a plurality of cuts that do not reach the edge at predetermined positions on the edge of the label. Also in this case, if a cut is made with the die cutter, the shape of the die cutter becomes complicated as in the above case.
As a method of processing fine holes in the edge portion of the label, for example, the edge of the label of the film traveling along the flow direction of the film using a processing jig as described in JP-A-61-242133. There is a method of mechanically processing fine holes in the area. In this case, since the fine holes are processed along the direction parallel to the flow (longitudinal) direction of the film, the edge of the label is along the flow direction of the film. However, there is a problem that fine processing cannot be performed on the non-parallel portion, or even if it is parallel, the edge portion of the label that has a step and deviates from the processing width of the fine processing jig.

On the other hand, due to the design, design, appearance, etc., the end face has a non-linear shape, for example, a shape having a step partially protruding or retracted from a straight line, a circle,
Atypical adhesive labels such as ellipses and heart shapes are often used, and in this case, it was difficult to perform fine processing on the entire edge of the label. Also, when sticking an adhesive label to an adherend, the direction of the label is not always constant, so the end face that is microfabricated may not be located at the place of the adherend that requires tearing and may tear. In some cases it was not possible.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides an easily tearable adhesive label which can be easily torn from any edge of the label by the force of a finger, and its constitution is at least a synthetic resin film. A pressure-sensitive adhesive label comprising the synthetic resin film as a constituent material, characterized in that a large number of fine scratches are provided on the entire surface of a synthetic resin film, and is particularly suitable for a pressure-sensitive adhesive label having an irregular shape.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The adhesive label of the present invention comprising at least a synthetic resin film as a constituent material has a large number of fine scratches on the entire surface of the synthetic resin film. Unlike the conventional scratches that are provided only on the end portions of the label, most of the scratches are sharp tears of a size that cannot be observed unless seen with the naked eye. As a method for providing a large number of fine scratches on the entire surface of a synthetic resin film, for example, JP-A-5-387 is known.
No. 65, the hard particles having sharp corners are attached to the surface by a method such as electrodeposition, and a synthetic resin film is passed between the first roll and the second roll having a smooth surface. Fine pressure marks are applied to the entire surface of the synthetic resin film at the sharp corners of the particles by adjusting the pressing force to the synthetic resin film passing through There is a way.

[0008] In this case, even if the size of the particles having sharp corners is adjusted to be uniform, there is a distribution in the particle size, so that the synthetic resin film is provided with through-holes and non-through-holes at the same time, and the scar size is also distributed. It is common to have The size and density of fine scratches vary mainly depending on the thickness of the synthetic resin film used, but generally the size is 10 to 200 μm and the density is 500 to 3000 pieces /
It is about cm ² , and as the film thickness increases, the size decreases and the density increases. Here, the size of the scar means the maximum length of the scar generated on the side where the scar is processed.

The larger the scratch size and the higher the density, the easier the tearing. However, depending on the construction of the pressure-sensitive adhesive label, the tearing may be too easy. Therefore, it is necessary to adjust according to the construction. For example, in the case of a polyethylene terephthalate resin film having a thickness of 12 μm, the size is 20 to 60 μm, the density is about 1500 to 2500 pieces / cm ² , and in the case of a polypropylene resin film having a thickness of 20 μm, it is 50 to 15
It is generally 0 μm and a density of about 500 to 1000 pieces / cm ² .

The synthetic resin film is used as the surface substrate of the pressure-sensitive adhesive label.
Polyolefin resin such as axially stretched polyethylene resin or polypropylene resin, polyester resin such as cyclic polyolefin resin, polyethylene terephthalate and polyethylene naphthalate, polyamide resin such as nylon 6, nylon 66 and aromatic nylon resin,
Examples thereof include films of polystyrene resins and polyvinyl chloride resins, foamed films of these resins, opaque films containing a filler such as talc and titanium oxide in the resins, and films obtained by vapor deposition of metal thin films.

These synthetic resin films may be coextrusion films of the same type of resin or different types of resins. These resin films as adhesive labels,
It may be used alone or laminated with other resin films, high quality paper, paper such as cast coated paper and art paper, metal vapor deposition paper, metal foil and the like. The irregularly shaped adhesive label of the present invention is not a mere rectangular or quadrangular shape, for example, a) a curve that does not intersect edge lines (eg, circle, ellipse) b) a curve that intersects edge lines Composed of combinations (eg, heart, moon) c) Composed of curves and straight lines that intersect the edge lines and having 5 or more intersections (eg, bottom left of Figure 1) d ) A combination of straight lines where the edge lines intersect and the number of intersections is 5 or more (eg, a polygon with a pentagon or more, a cross,
(T-shape, lightning bolt shape) e) Consists of a combination of straight lines where the edge lines intersect and the number of intersections is 3 to 4 (eg, triangle, rhombus), etc. A large number of fine scratches are provided on the entire surface of the synthetic resin film.
An example of a part of the shape is shown in FIG.

The type of adhesive used for the label is determined in consideration of the use environment such as adhesive strength, water resistance, weather resistance and heat resistance, the type of adherend, etc. Organic solvent-based rubber adhesive with rosin-based resin or plasticizer added, hot melt rubber-based adhesive containing SBR as the main raw material, organic solvent-based two-liquid reaction type acrylic or emulsion acrylic, A vinyl acetate-based adhesive, a starch-based adhesive, a casein-based adhesive, or the like is used.
An adhesive label is a die cutter rotary blade that directly engraves the contour of the specified label on the surface of the rotating cylinder after applying the adhesive to the label material with the specified pattern and inserting the release paper on the adhesive side. On the other hand, it is manufactured by a half-cut cutting method in which a cylindrical object that rotates at the same speed as the rotary blade is pressed like a fixed blade to press only the label while rotating.

Next, an example of the constitution of the easily tearable pressure-sensitive adhesive label of the present invention comprising at least a synthetic resin film as a constituent material will be explained with reference to the drawings. 2 to 5 are enlarged sectional views in the thickness direction of the easily tearable adhesive label of the present invention, 1 is an easily tearable adhesive label, 2 is a synthetic resin film A, 3 is a synthetic resin film B, 4 is paper, Reference numeral 5 is an adhesive, 6 is a fine scratch penetrating the synthetic resin film, and 7 is a fine scratch not penetrating the synthetic resin film. FIG. 2 shows an example of an adhesive label composed of only the synthetic resin film A. The synthetic resin film A is provided with fine penetrating scratches 6 and non-penetrating scratches 7 on the entire surface. It serves as a stress concentration source and acts as a starting point of tear initiation and facilitates tear propagation. 2 to 5, the scratches are shown as fine scratches formed from the upper side of the synthetic resin film (upper side of the drawing) and opened on the upper side, but may be formed from the adhesive 5 side.

The size and density of a large number of fine scratches formed on the synthetic resin film are those on the side on which the scratches are formed (the scratches on the open side in the figure). The adhesive 5 has a scar 6,
7 is applied to the synthetic resin film A, and the adhesive 5
Although not shown on the side, when the label is attached while protecting the adhesive surface until the label is used,
A silicone coated release paper is applied to the paper or synthetic resin film that serves to carry the individual labels.
3 and 4 are examples in which two types of synthetic resin films A and B are laminated, and the synthetic resin films A and B may be the same type of resin or different types of resin.

FIG. 3 shows an example in which fine scratches are formed on the synthetic resin films A and B after being laminated, and FIG. 4 is an example in which fine scratches are separately formed on the synthetic resin films A and B and then laminated. is there. The synthetic resin films A and B are adhered to each other by a method such as a coextrusion method, a dry laminating method, a wet laminating method, a hot melt laminating method, an extrusion laminating method or the like, although an adhesive is not shown in the drawing. FIG. 5 shows a paper 4 on a synthetic resin film A.
In this case, it is not always necessary to give fine scratches to the layer which originally has hand-cutting properties, even if no scratches are given like the paper 4. In most cases, adhesive labels are printed by screen printing, offset printing, etc.When the synthetic resin film on the label surface is opaque, the label surface is printed on the label surface side, and when it is transparent, the label surface is printed. It is printed on the front side or on the back side.

The pressure-sensitive adhesive label of the present invention is mainly used for packaging and is used as a quality display label, a weighing (price) label, an advertisement sticker, and a decorative label.

[0017]

【Example】

Example 1 This example is an easily tearable adhesive label corresponding to the structure shown in FIG. Polyurethane resin with inorganic filler added and biaxially stretched to obtain microvoids White 60 μm thick Oji Yuka Kasei Co., Ltd. product name “Yupo” film with a diamond-shaped inner side of 30 mm The pattern was printed on. The film is pressed between the metal roll having a width of 1 m and the metal roll having a smooth surface on which diamond particles are attached by electro-deposition on the surface of the film, thereby pressing the film from the side opposite to the printed surface to the entire surface of the film. Many fine scratches were added.

Next, the surface of the film opposite to the printing surface
25g / m of acrylic adhesive ^TwoApply it to the surface
Laminated release paper is attached, and the outline of the rhombus label shape is attached.
With the engraved rotating die cutter blade
Half of the rum was cut and wound into a roll.
  This adhesive label stripped from the release paper is
It could be easily torn by hand from anywhere in the. K
Attach the cover and main body of the polystyrene container
Close to the adhesive label to open the one stopped with the wearing label
The container is destroyed when the lid of the container and the container body are separated by hand.
You can tear the adhesive label without opening the container
I was able to.

[0019]

Example 2 This example is an easily tearable adhesive label corresponding to the structure shown in FIG. A biaxially oriented polypropylene film having a thickness of 20 μm was printed with a pattern on the inside of a circle having a diameter of 40 mm. A large number of fine scratches were formed on the entire surface of the film in the same manner as in Example 1 from the surface opposite to the printed surface of this film. The unit weight is 50 on the print side of this film.
After laminating g / m ² of paper, an adhesive was applied in the same manner as in Example 1, and then a propylene film and paper were half-cut with a rotating die cutter blade engraved with the outline of a circular label shape to form a roll. I wound up. This adhesive label peeled off from the release paper can be easily torn from anywhere on the edge of the label as in Example 1, and even when the lid of the container is stopped, the label can be torn without breaking the container. I was able to open it.

[0020]

The pressure-sensitive adhesive label of the present invention can be manufactured without using a complicated device, and even a label having a different shape can be easily torn from any part of the edge by the force of fingers.

[0021]

[Brief description of drawings]

FIG. 1 is an example of the shape of a variant adhesive label of the present invention.

FIG. 2 is an enlarged sectional view in the thickness direction of the easily tearable adhesive label of the present invention.

FIG. 3 is an enlarged cross-sectional view of another example of the easily tearable adhesive label of the present invention.

FIG. 4 is an enlarged cross-sectional view of still another example of the easily tearable adhesive label of the present invention.

FIG. 5 is an enlarged cross-sectional view of still another example of the easily tearable adhesive label of the present invention.

[0022]

[Explanation of symbols]

1 Easy tear adhesive label 2,3 synthetic resin film 4 paper 5 Adhesive 6 Penetration scar 7 Non-penetrating scar

Claims (2)

[Claims] 1. An easily tearable adhesive label comprising at least a synthetic resin film as a constituent material, wherein a large number of fine scratches are provided on the entire surface of the synthetic resin film. 2. The adhesive label according to claim 1, wherein the shape of the label is an atypical shape.