JPH0525442A - Self-adhesive tape and its production - Google Patents

Abstract

PURPOSE:To enable the after-printing of a small lot of a self-adhesive tape and satisfy the need for a small-lot production of many kinds of the tape by using a raw self-adhesive tape comprising a substrate and a self-adhesive applied thereto. CONSTITUTION:A self-adhesive tape is prepd. by exposing one side of an OPP film base 1 to corona discharge, coating the side with a self-adhesive consisting of an acrylic resin emulsion, drying the adhesive to give a raw self-adhesive tape 3, exposing the rear side of the raw tape 3 to corona discharge, flexographically printing the rear side using a printing ink 4 based on a nitrocellulose resin, and forming a nonsilicone release layer 5 on the printed side.

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 tape having a polyolefin resin sheet or film as a base material and having a surface (back surface) opposite to the pressure-sensitive adhesive layer printed thereon, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a pressure-sensitive adhesive tape A having a polyolefin resin sheet or film as a base material B and having printing is
As shown in FIG. 2, after the corona discharge treatment is applied to one surface of the base material B and the printing P is applied, the undercoat agent U and then the adhesive agent C are applied to the printing surface, and the release agent D is applied to the back surface. Is manufactured by being coated.

Since the printing P of the base material B is performed by gravure printing, it takes a long time to make a printing plate, and since the plate making cost is high, it is not suitable for printing in a small lot, and many printings are required. There was a drawback that it did not meet the demand for small-lot production of varieties.

Therefore, in order to enable printing of small lots of adhesive tape, a roll of a roll of adhesive tape having a base material coated with a pressure sensitive adhesive is manufactured in advance, and the roll is unwound. A method of printing after the required lot was examined.

However, when the above-mentioned post-printing method is applied to the conventional pressure-sensitive adhesive tape manufacturing method, since the rubber-based pressure-sensitive adhesive is applied to the raw material of the pressure-sensitive adhesive tape, it is necessary to rewind the wound body with a small spreading force. , It is necessary to provide a release agent layer on the back,
There is a drawback in that the release agent layer hinders the adhesion of the printing ink.

Biaxially oriented polypropylene (OPP)
When printing is performed on the film base material using a printing ink having a urethane bond, it takes a long time of 24 to 72 hours until the adhesive force is developed on the base material, and the release agent is added immediately after the printing. When coated, it also had a drawback that the printing ink was dissolved by the solvent in the release agent.

Further, there is a problem that the release agent layer and the printing ink layer are destroyed by the residual solvent in the rubber-based pressure-sensitive adhesive.

[0008]

SUMMARY OF THE INVENTION In view of the above drawbacks, the present invention makes it possible to perform post-printing of a small lot of adhesive tape by using an adhesive tape raw material having a base material coated with an adhesive in advance. An object of the present invention is to provide an adhesive tape and a manufacturing method thereof that meet the requirements for high-mix low-volume production.

[0009]

The present invention comprises two inventions. The pressure-sensitive adhesive tape according to claim 1 of the present invention comprises a polyolefin resin sheet or film as a base material, and one surface of the base material is provided with a pressure-sensitive adhesive layer after pretreatment by corona discharge, and the other surface. Is characterized in that a printing process is performed after a pretreatment by corona discharge, and a release agent layer is formed on the printing surface.

The method for producing an adhesive tape according to claim 2 of the present invention is characterized in that a polyolefin resin sheet or film is used as a base material, and one surface of the base material is subjected to pretreatment by corona discharge and then an emulsion type adhesive agent. Applied,
It is characterized in that the other surface is subjected to a pretreatment by corona discharge before or after the winding / rewinding step and then subjected to flexographic printing, and then a non-silicone release agent is applied. With the above configuration, the object of the present invention is achieved.

The present invention will be described in detail below. The substrate used in the present invention is a polyolefin resin sheet or film, and for example, a biaxially oriented polypropylene (OPP) film, a film of polyethylene or the like is preferably used.

Corona discharge treatment is applied to one surface of the above-mentioned base material prior to the adhesive coating, and then the adhesive is coated by a roll coater or the like. Corona discharge treatment eliminates the need for an undercoat of the base material and enables the direct application of the adhesive on the base material surface.

The pressure-sensitive adhesive used in the present invention is of an emulsion type, for example, an emulsion type acrylic resin. In the present invention, the pressure-sensitive adhesive is coated on one surface of the base material and then wound up into a wound body of the raw material of the adhesive tape. By using an emulsion type pressure-sensitive adhesive, the wound body does not require a release agent layer on the back surface and can be rewound with a small developing force.

Next, the above-mentioned wound body is rewound, and the back surface of the wound body is printed. Prior to the above printing process,
First, a corona discharge treatment is applied to the back surface of the raw adhesive tape, and flexographic printing is performed on the back surface subjected to the corona discharge.

Since the printing plate material made of rubber or synthetic resin can be used by adopting the flexographic printing method, the cost of the plate material is low, the delivery time of the plate material is shortened, and the multi-product small lot printing can be performed. Therefore, the printing cost can be reduced.

As the printing ink, a cellulose resin dissolved in a solvent such as isopropyl alcohol is used, and the printing ink of the cellulose resin forms a printing layer having excellent solvent resistance immediately after printing. be able to.

Further, since the back surface of the above-mentioned adhesive tape raw material is subjected to corona discharge treatment, the adhesion between the printing ink and the base material is not hindered and it can be made strong. The adhesive tape stock that has been subjected to printing is subjected to a release agent treatment on its back surface (printing surface), then slit into a predetermined width, and wound up to form a wound body of the adhesive tape.

As the release agent in the present invention, a non-silicone type release agent is required so that the printing surface can be written when the adhesive tape is used. For example, a modified polyolefin release agent is used.

[0019]

According to the present invention, by using an emulsion type pressure-sensitive adhesive, it is possible to provide a raw material for pressure-sensitive adhesive tape which can be easily developed without a release agent layer on the back surface of the pressure-sensitive adhesive tape substrate. Enables printing after handling small lots.
Further, by adopting the flexographic printing method, the printing plate material can be produced inexpensively in a short period of time, and printing of a small lot can be efficiently performed, thus enabling high-mix low-volume production.

[0020]

EXAMPLES Examples of the present invention will be described below. (Example) On one side of an OPP film substrate 1 having a thickness of 40 μm, a line speed of 10 to 70 m / min and 70 V (3.1 A).
After performing corona discharge treatment under the condition of -100 V (4.8 A), an emulsion type acrylic resin adhesive (ROHM & Haas, "TK-8005D" manufactured by Japan Co., Ltd.)
The wound body of the raw material 3 for pressure-sensitive adhesive tape having the pressure-sensitive adhesive layer 2 was prepared by coating and drying so that the coating amount after drying was 20 to 30 g / m ² .

While rewinding the above-mentioned material 3, the back surface (the surface opposite to the pressure-sensitive adhesive coated surface) was subjected to corona discharge treatment under the same conditions as described above, and then the nitrocellulose resin (manufactured by Dainippon Ink and Chemicals, Inc. (Brightflex G ") 100 parts by weight of a film-strength adjusting additive (manufactured by Dainippon Ink and Chemicals, Inc.) at a ratio of 3 parts by weight, and using a printing ink 4 diluted with isopropyl alcohol, a flexographic printing machine Printed.

Next, a modified polyolefin-based mold release agent ("Peeloyl 1050" manufactured by Yushisha Yushi Kogyo Co., Ltd.) as a non-silicone mold release agent was diluted with cyclohexane on the printed surface of the original fabric, and the coating amount after drying was applied. Is 0.08 to 0.2 g / m
^The release agent layer 5 was formed by coating so as to have a thickness of ² . The adhesive tape stock 3 on which the release agent layer 5 was formed was slit into a width of 40 mm to prepare an OPP adhesive tape 10.

As a result, the roll 3 of the pressure-sensitive adhesive tape can be unwound with a small spreading force, and the roll 3 can be printed well by the flexographic printing method.

[0024]

According to the present invention, since there is no silicone type release agent layer on the back surface, writing can be freely performed on the back surface.

Further, according to the present invention, a roll for adhesive tape can be obtained which can be easily rewound without providing a release agent layer on the back surface. Therefore, the roll can be used for a small lot. After that, you can print.

Further, by adopting the flexographic printing method, the printing plate material can be produced inexpensively in a short period of time, and printing of a small lot can be efficiently performed.
High-mix low-volume production is possible, and the printing cost and production cost of the adhesive tape can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an adhesive tape of the present invention.

FIG. 2 is a cross-sectional view showing an adhesive tape manufactured by a conventional method.

[Explanation of symbols]

1 base material 2 Adhesive layer 3 Raw material for adhesive tape 4 printing ink 5 Release agent layer 10 Adhesive tape

Claims (2)

[Claims] 1. A polyolefin resin sheet or film is used as a base material, a pressure-sensitive adhesive layer is provided on one surface of the base material after pretreatment by corona discharge, and the other surface is pretreated by corona discharge. After being applied, printing is done,
An adhesive tape having a release agent layer formed on the printed surface. 2. A polyolefin resin sheet or film is used as a base material, and one surface of the base material is pretreated by corona discharge and then coated with an emulsion type adhesive,
Adhesion characterized by applying a flexo printing process to the other surface after pretreatment by corona discharge, with or without passing through the winding and rewinding process, and then applying a non-silicone release agent. Tape manufacturing method.