JP2002221905A - Transparent adhesive label sheet for display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove air bubbles formed between a film and an adherend when attaching a transparent adhesive label for display having a transparent film as a surface substrate to the adherend. Improve the appearance of the label. SOLUTION: In a transparent adhesive label sheet for display having a transparent film as a surface base material and an adhesive layer formed on the back surface thereof, an opening is formed to communicate with the coating surface of the adhesive layer at the outer edge of the sheet to the outside. A large number of narrow groove-shaped non-coated areas are set to 0.
A transparent adhesive label sheet for display characterized by being formed as a pattern of a groove width in the range of 2 mm to 5 mm and a groove interval of 2 mm to 10 mm, and a spring coil or a spiral projection when the adhesive is applied. A method for producing a narrow groove pattern using a pair of rotating cylinders. The pattern is preferably in the form of a stripe, particularly a lattice. [Effect] When a pressure-sensitive adhesive label for display having a transparent film is attached to an adherend, air bubbles can be effectively removed to give a good appearance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent pressure-sensitive adhesive label sheet for display, and is capable of removing bubbles (air) generated when a label using a transparent film as a surface substrate is adhered to an adherend. The present invention relates to a transparent adhesive label sheet for display.

[0002]

2. Description of the Related Art An adhesive label for display using a transparent film as a base material is adhered to an adherend by an adhesive layer on a back surface. At this time, air is generated between the adhesive and the adherend. Air bubbles can be generated by intrusion, which impairs the appearance of an otherwise uniformly transparent label. To cope with this problem, it is conceivable to emboss the release paper to be combined with the label and let the air escape by the uneven pattern transferred to the adhesive layer. I need. Attempts have also been made to apply a technique for producing a bandage with an adhesive layer that has been made air-permeable by pattern coating with an adhesive, but the penetration of air is rather accelerated, and the purpose of suppressing air bubbles has not been achieved.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to suppress the formation of air bubbles due to the invasion of air when sticking to an adherend, particularly for a transparent adhesive label sheet for display using a transparent film as a base material, thereby improving the appearance. It is an object of the present invention to provide a transparent adhesive label sheet for display which can be favorably maintained and a method for producing the same.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a transparent adhesive label sheet for display having a transparent film as a surface substrate and an adhesive layer formed on the back surface thereof, with respect to the coated surface of the adhesive layer. A large number of narrow groove-shaped non-coating areas communicating with and opening to the outer edge of the sheet are formed as a pattern having a groove width in the range of 0.2 mm to 5 mm and a groove interval of 2 mm to 10 mm. Item 1 is achieved by the transparent adhesive label sheet for display according to item 1.

[0005] The pattern of the non-coated area of the narrow groove in the non-coated area of the narrow groove is a stripe-shaped pattern extending parallel to the sheet flow direction and formed at a predetermined interval in the width direction. And a first group of a plurality of oblique stripes extending at a predetermined angle with respect to the sheet flow direction and at predetermined intervals parallel to each other, and opposite to the predetermined angle with respect to the sheet flow direction. It is preferable that the pattern is a lattice pattern formed by intersecting with a second group of oblique stripes extending parallel to each other at a predetermined angle at a predetermined angle.

In the pressure-sensitive adhesive label sheet according to the second aspect of the present invention, the pressure-sensitive adhesive is supplied onto the continuously running sheet, and a coil-shaped spring having a predetermined wire diameter flows through the coil axis downstream of the pressure-sensitive adhesive coating section. The pressure is applied to the pressure-sensitive adhesive layer formed at right angles to the direction of the sheet, whereby a large number of fine wires corresponding to the wire diameter are formed along the flow direction of the sheet at the pitch interval of the spring in the portion where the spring presses the pressure-sensitive adhesive layer surface and The adhesive label sheet can be manufactured by the method for manufacturing an adhesive label sheet according to claim 4, wherein the adhesive label sheet is formed parallel to each other at a predetermined interval in a direction perpendicular to the flow direction.

As another method, the pressure-sensitive adhesive label sheet according to claim 3 supplies a pressure-sensitive adhesive onto a continuously running sheet, and has a spiral ridge having a predetermined spiral angle and a predetermined pitch with respect to the flow direction on the outer peripheral surface. The first and second rotating cylinders provided are provided at predetermined intervals in the flow direction on the downstream side of the adhesive coating section so that the angles are opposite to each other with respect to the flow direction of the sheet. By bringing these rotating cylinders into contact with the surface of the pressure-sensitive adhesive layer of the label sheet under rotation, they are formed by the first rotating cylinder, form a predetermined angle in the flow direction, and are formed parallel to each other at a predetermined pitch. A second skewed stripe group formed by the first skewed stripe group and the second rotating cylinder and forming an angle opposite to the predetermined angle and formed parallel to each other at the predetermined pitch. It can be manufactured by the manufacturing method of the pressure-sensitive adhesive label sheet to form a grid pattern by 交又 each other.

[0008]

Preferred embodiments of the present invention will be described below with reference to the drawings. Fig. 1a is a plan view of a main part of an embodiment of the adhesive label sheet of the present invention, Fig. 1b is a sectional view of a main part of the embodiment of the adhesive label sheet of the present invention, and Fig. 2a is an adhesive label sheet of the present invention. FIG. 2b is a cross-sectional view of a main part of another embodiment of the pressure-sensitive adhesive label sheet of the present invention. FIG. 3 is an explanatory view showing an example of the method for producing the pressure-sensitive adhesive label sheet of the present invention, and FIG. 4 is an explanatory view showing another example of the method of producing the pressure-sensitive adhesive label sheet of the present invention.

In the transparent pressure-sensitive adhesive label sheet for display shown in FIGS. 1A and 1B, a pressure-sensitive adhesive layer 2 is applied to the lower surface of a film 1 as a transparent surface substrate, and the flow of the sheet is applied to the surface of the pressure-sensitive adhesive layer 2. Width along the direction (vertical direction in the figure)
Numerous narrow grooves of 2 to 5 mm (non-adhesive coated part) 3, 3, ...
Are formed in a stripe pattern parallel to each other with a gap (adhesive coated portion) of 2 to 10 mm between them. Reference numeral 4 denotes a release paper.

In the illustrated pressure-sensitive adhesive label sheet, even if air is mixed in at the time of adhering to the adherend, it is discharged to the outside through the narrow grooves 3 and 3 through the opening communicating with the outside at the sheet outer end line. Thus, the air bubbles trapped inside do not impair the appearance of a film label that is originally uniformly transparent.

If the groove width of the narrow groove 3 is too wide and exceeds 5 mm, the effect of suppressing the formation of air bubbles is not seen, probably because a large amount of air is taken in when the lower surface is adhered to the adherend. Accordingly, the groove width is preferably as small as possible as long as it is sufficient to guide air forming bubbles and to discharge the air from the opening at the outer edge of the sheet. The groove may be closed by the flow of the peripheral pressure-sensitive adhesive layer 2, and the air may not be completely discharged. Therefore, the effective groove width is 0.2 mm to 5 m
m. The smaller the gap between the narrow grooves 3 is, the more effective the release of air bubbles is. However, if the gap is too narrow, the width (coating amount) of the pressure-sensitive adhesive layer 2 is relatively reduced, so that the adhesive force is reduced and the entire film is reduced. It also affects transparency. Preferred gap is 2mm
10 to 10 mm.

In the transparent adhesive label sheet for display shown in FIGS. 2a and 2b, a large number of diamond-shaped pressure-sensitive adhesive coating areas 2 are successively adjacent via diamond-shaped grooves 3 (uncoated portions) formed at the periphery. It is formed as a pattern of a shape. This pattern includes a first group of oblique stripes 4 extending at a predetermined angle (45 ° in the illustrated example) in the flow direction as shown in FIGS. 2 and 4, and a direction opposite to the predetermined angle in the flow direction. It is formed by a combination with the second group of oblique stripes 5 extending at an angle.

The illustrated grid pattern is shown in FIG.
The effect of suppressing the formation of bubbles is better than that of the stripe pattern shown in FIG. That is, in the stripe pattern of FIG. 1A, the narrow grooves 3, 3,... For air release are opened only at both end faces in the flow direction of the adhesive label sheet, and there is no communication portion between the narrow grooves. In contrast, FIG.
In addition to this, the rhombic lattice-shaped pattern is open on both side end faces in communication with the outside, and the first
There are interconnected parts between the group and the second group. For this reason, even if some of the formed narrow grooves are closed by the flow of the pressure-sensitive adhesive label sheet, they are communicated with the end face through some route, and the trapped air is reliably eliminated. The effect of suppressing the residual air bubbles is great.

As a specific means for forming the stripe shown in FIG. 1, for example, immediately below the adhesive application portion of the coater of the existing adhesive sheet or on the downstream side in the vicinity thereof, FIG.
Is pressed against the surface of the pressure-sensitive adhesive layer 2 applied under rotation with the coil axial direction orthogonal to the sheet flow method (the direction of the arrow). Thus, on the surface of the pressure-sensitive adhesive layer 2 after coating, narrow grooves 3, 3... Having a groove width corresponding to the wire diameter of the coil spring 5 are arranged in the sheet width direction corresponding to the pitch of the coil spring 5 (pressure-sensitive adhesive). It is formed as a stripe pattern parallel to each other in the coating portion).

Since this method is carried out only by providing a predetermined coil-shaped spring 5 at or near the coating portion so as to be rotatable, the transparent adhesive label sheet for display of the present invention can be manufactured very easily. . As a means for forming a pattern of narrow grooves parallel to the flow direction, any means other than a coil spring can be considered. For example, it has been attempted to use a flat plate provided with a comb-shaped lower portion, but the comb tooth plate is easily deformed and broken, and the use of the spring member is practically preferable in terms of rigidity, elasticity, strength and the like.

The coil wire diameter for forming the striped pattern having a preferable shape as described above is 1 to 10
mm, so that each coil loop forms a narrow groove having a width of 0.2 to 5 mm when the pressure-sensitive adhesive layer is pressed against a part of the outer periphery. The pitch of the coil spring is 2m
m to 10 mm. The coating amount of the adhesive is about 10 to 25 g / m ² in terms of solid content weight.

The rhombic lattice pattern shown in FIG. 2 is, for example, as shown in FIG. 4, two rotating cylinders 7 and 8 having spiral ridges 6 and 6 on the peripheral surface are provided on the downstream side of the adhesive coating section. It is obtained by providing at appropriate intervals along the flow direction of the coated sheet 9 and rotatingly contacting the surface of the pressure-sensitive adhesive layer.
Here, the spiral ridge 6 of the first rotary cylindrical body 7 is continuously formed on its rotating peripheral surface at a predetermined angle α and a predetermined helical pitch with respect to the sheet flow direction (arrow direction). The spiral ridge 6 of the two rotary cylinders 8 is continuously formed on its rotating peripheral surface at an angle opposite to the angle α and at the same pitch as the spiral.

Therefore, in the transparent pressure-sensitive adhesive label sheet for display of FIG. 4, the first rotary cylinder 7 provided immediately below the coating portion with respect to the surface of the pressure-sensitive adhesive layer formed on the sheet.
This forms a first group of skew stripes A as streaks of spiral ridges 6, and then a second rotating cylinder 8 downstream of the second group of skew as streaks of spiral ridges 6. A stripe B is formed so as to overlap with the stripe B, and a diamond-shaped lattice pattern A + B as shown in the figure is formed.

As a specific means used in this manufacturing method, for example, only a rotary cylinder having two spiral ridges as described above is provided on the downstream side of the pressure-sensitive adhesive application portion of the existing pressure-sensitive adhesive sheet coater. Therefore, the manufacturing method can be implemented very simply. For the same reason as the above-mentioned stripe pattern, the groove width of each oblique stripe (uncoated portion) of the pattern is in the range of about 0.5 mm to 5 mm, and the interval between opposing and adjacent stripes is 2 m.
Preferably, it is in the range of m to 10 mm.

In the pair of rotary cylinders, the adhesive may adhere between the spiral ridges during the operation of scraping the adhesive in the form of a stripe, and a narrow groove having an accurate shape may not be formed.
In this case, similar cleaning rotary cylinders each having a corresponding spiral ridge are provided above and in contact with the peripheral surface of each rotary cylinder, and are engaged with each other to scrape the adhesive clogged in the gap between the spiral ridges. It is preferable to take it. In this case, the rotary cylinder for cleaning may be rotated with the rotation of the rotary cylinder for forming the narrow groove, or may be positively driven to rotate.

The coil spring shown in FIG. 3 or the rotary cylinder on the upstream side shown in FIG. 4 may be provided directly below the coating portion or may be provided at a predetermined position downstream.

The pressure-sensitive adhesive label sheet of the present invention has a simple structure in which a jig for forming a simple narrow groove (a pair of rotary cylinders with a coil spring or a spiral ridge) is provided downstream of a conventional coating apparatus. The pressure-sensitive adhesive label sheet is obtained by suppressing bubbles which are likely to be formed in a transparent film at the time of sticking to an adherend, thereby preventing the label appearance from being impaired.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples.

Example 1 An acrylic solvent-type pressure-sensitive adhesive composed of 40 parts by weight of an acrylate-based polymer, 30 parts by weight of ether acetate, and 30 parts by weight of toluene was coated on the back surface of a transparent film having a thickness of 50 μm with a coating roller. The entire surface is coated at 40 μm, and a φ2 mm spring coil provided with a gap downstream of the application roller is pressed while rotating on the adhesive surface to form a stripe-shaped pattern parallel to the adhesive surface, and then dried. The transparent adhesive label sheet for display shown in FIG. 1 was obtained by laminating with release paper.

Example 2 φ2 mm was placed immediately below the pressure-sensitive adhesive coating section (coater head).
Is fixed, and the same acrylic solvent-type pressure-sensitive adhesive as that of Example 1 is applied on the entire surface of a transparent film having a thickness of 40 μm as a base sheet with a thickness of 40 μm, and at the same time as shown in FIG. After forming a stripe-shaped pattern on the surface of the pressure-sensitive adhesive as described above, the resultant was dried and bonded to a predetermined release paper to obtain a transparent pressure-sensitive adhesive label sheet for display similar to that shown in FIG.

Example 3 First and second cylindrical gears (rotating cylindrical bodies) in which spiral ridges having a helical angle of 45 ° with respect to the axial direction, a tip width of 2 mm, and a pitch between strips are continuously formed on the outer peripheral surface are provided. As shown in FIG. 4, the first gear has a rightward angle between the adhesive coating section and the drying section, and the second gear has a leftward angle so that the angle of the second gear is in the flow direction. They were provided in parallel. The gear rotation speed and the vertical position were made variable. On a transparent film having a thickness of 50 μm, the same acrylic solvent-type pressure-sensitive adhesive as in Example 1 was applied over the entire surface at a thickness of 40 μm,
First and second gears provided in parallel at intervals were pressed against the adhesive surface while rotating. The rotation speed and the clearance between the rolls were adjusted, then dried, and then adhered to a predetermined release paper to obtain a transparent adhesive label sheet for display having a pattern shown in FIG.

Embodiment 4 Cylindrical gears having the same pitch and requiring cleaning are installed on the first and second cylindrical gears used in Embodiment 3 so as to mesh with each other, and processing is performed in the same manner as in each embodiment. A transparent adhesive label sheet for display was produced while removing the adhesive adhered between the pitches of the spiral projections in the process of forming the narrow grooves by engaging with the upper cleaning gear.

Comparative Example 1 The same acrylic solvent-based pressure-sensitive adhesive as that of Example 1 was applied to the entire surface of a 50-μm-thick transparent film at a thickness of 40 μm, dried, and laminated with a predetermined release paper and a transparent pressure-sensitive adhesive label sheet for display. I got

The transparent adhesive label sheets for display of Examples 1-4 and Comparative Example 1 produced as described above were used at room temperature × 7.
After aging for more than one day, the following items shown in Table 1 were determined. (1) Printability: UV seal printing (50 m / min) using a company S rotary printing press (P2015CF). Printability is determined by the naked eye. (2) Printability: Printing by the printer (TECB-1000) installed in the filling line of the TEC B-1000, Ribbon D, and S company. Printing speed 600 sheets / hour. The printability is determined by the naked eye. (3) Bubble mixing degree: Adhered to a 18-L bale can at 600 cans / hour by a fully automatic labeler installed in the filling line of Company S. Label size: 249mm x 16
0 mm. The degree of air bubble mixing is determined by the naked eye. (4) Defoaming effect: The label affixed to an 18-L bale can is pressure-bonded with a "conditioning roll" attached to a fully automatic labeler installed on the line of Company S. The state of deaeration of air bubbles of the attached label after the pressure bonding is visually determined. (5) Continuous stability of “groove” formation: 6,000 pressure-sensitive adhesive sheets
Processing is performed continuously for m times, and the stability of the “groove” width is visually determined.

As is clear from Table 1, the transparent adhesive label sheets for display in each of the examples show excellent results, and particularly in Example 4, the transparent adhesive label sheets for display having good characteristics over all measurement items. Was obtained.

[0031]

[Table 1] Pass / fail judgment: XX <X <△ <〇 <◎

[0032]

The transparent pressure-sensitive adhesive label sheet for display of the present invention suppresses air bubbles generated by air mixing when adhering a pressure-sensitive adhesive label having a transparent film as a surface substrate to an adherend, and mixes the air bubbles. A good appearance is given to the transparent pressure-sensitive adhesive label sheet for display attached by removing air bubbles. The pressure-sensitive adhesive sheet of the present invention can be obtained by a simple configuration in which a jig for forming an air escape groove is provided in a part of the coating process of the existing transparent pressure-sensitive adhesive label sheet manufacturing apparatus.

[Brief description of the drawings]

1A is a plan view of a main part of an embodiment of a transparent adhesive label sheet for display of the present invention, and FIG. 1B is a cross-sectional view in the thickness direction of the sheet of FIG.

2A is a plan view of a main part of another embodiment of the transparent adhesive label sheet for display of the present invention, and FIG. 2B is a cross-sectional view in the thickness direction of the sheet of FIG.

FIG. 3 is an explanatory view showing an embodiment of a method for producing a transparent adhesive label sheet for display of the present invention.

FIG. 4 is an explanatory view showing another embodiment of the method for producing a transparent adhesive label sheet for display of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Transparent film 2 Adhesive layer 3 Narrow groove (adhesive non-coated part) 4 Release paper 5 Spring coil 6, 6 Spiral ridge 7, 8 Rotating cylindrical body (gear) A First oblique stripe A + B First and Combination of the second oblique stripe pattern (lattice pattern) α helix angle

Claims (5)

[Claims] 1. A transparent adhesive label sheet for display having a transparent film as a front substrate and an adhesive layer formed on the back surface thereof, the opening of which is communicated to the outside at the outer edge of the sheet with respect to the coating surface of the adhesive layer. A large number of narrow groove-shaped uncoated areas are
A transparent adhesive label sheet for display, wherein the transparent adhesive label sheet is formed as a pattern having a groove width in the range of 5 mm to 5 mm and a groove interval of 2 mm to 10 mm. 2. The transparent adhesive label sheet for display according to claim 1, wherein the pattern is a pattern composed of a number of stripes extending in parallel with the flow direction of the sheet and formed at predetermined intervals in the width direction. 3. A first group of a plurality of oblique stripes in which the pattern extends at a predetermined angle with respect to the sheet flow direction and at a predetermined interval parallel to each other, and at a predetermined angle with respect to the sheet flow direction. The transparent adhesive for display according to claim 1, wherein the transparent adhesive for display according to claim 1, wherein the lattice-like pattern is formed by mutually intersecting a plurality of oblique stripes of a second group extending at predetermined angles opposite to each other and at predetermined intervals parallel to each other. Label sheet. 4. A pressure-sensitive adhesive is supplied onto a continuously running sheet, and a coil-shaped spring having a predetermined wire diameter is pressed to the pressure-sensitive adhesive layer at a position downstream of the pressure-sensitive adhesive coating section with the coil axis perpendicular to the flow direction. A number of narrow grooves corresponding to the wire diameter are formed in parallel with each other at a predetermined interval in a direction perpendicular to the flow direction along the sheet flow direction at a pitch of the spring at a portion where the spring presses the pressure-sensitive adhesive layer surface. A method for producing a pressure-sensitive adhesive label sheet formed on a sheet. 5. A method according to claim 1, wherein the first and second rotary cylinders are provided with a pressure-sensitive adhesive on a continuously running sheet and provided on the outer peripheral surface thereof with a spiral ridge having a predetermined spiral angle and a predetermined pitch with respect to the flow direction. These rotating cylinders are provided at predetermined intervals in the flow direction on the downstream side of the adhesive coating section so that the angles are opposite to each other with respect to the flow direction of the sheet. By contacting the body under rotation, a first skewed stripe group formed by the first rotating cylinder and forming a predetermined angle in the flow direction and parallel to each other at a predetermined pitch and the second rotation Manufacture of an adhesive label sheet for forming a grid-like pattern by intersecting second oblique lines formed by a cylindrical body at an angle opposite to the predetermined angle and formed parallel to each other at the predetermined pitch. One Law.