JPH06305235A - Method for printing on plasticized polyvinylchloride film - Google Patents

Abstract

PURPOSE:To raise adhesion to ultraviolet setting ink by a method wherein surface tension of a plasticized polyvinylchloride film is made a specific value by corona discharge treatment, and a diameter and a height of a projected material on a surface are made respective specific values. CONSTITUTION:Sticking plaster base raw fabric 1 is formed by laminating an adhesive layer and release paper on one surface of a plasticized polyvinylchloride film formed by mixing 45 pts.wt. of polyester plasticizer in 100 pts.wt. of plasticized vinylchloride. A surface of the plasticized vinylchloride film opposed to the adhesive layer of the raw fabric 1 is corona discharge treated while the base raw fabric 1 is traveled in contact with a semi circumference of an impression cylinder 5 to make surface tension of the film 40-55dyn/cm and a diameter and height of a projection 5-2.0mum/cm. Then, all the corona discharge treated surface is coated with ultraviolet setting ink 3, irradiated with ultraviolet rays from an ultraviolet irradiation device, and the ink 3 is printed again on ink 30 formed by setting the ink 3. Thereafter, it is irradiated with the ultraviolet, and set to form a printed surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for printing a UV-curable ink on a soft vinyl chloride resin film.

[0002]

2. Description of the Related Art Conventionally, a soft vinyl chloride resin film prepared by blending a plasticizer has been used as a base material for a material requiring flexibility such as a first aid bandage.
On one surface of the soft vinyl chloride resin film surface, an ink of one color is entirely printed, or characters or patterns are displayed by printing inks of a plurality of colors. Some of these printing inks use a solvent, but since there are various problems due to the presence of residual solvent in the ink after printing, solventless UV curable inks are always used. To use the ultraviolet curable ink, the ink is cured by printing it on a substrate film and then irradiating it with ultraviolet rays.

However, in a soft vinyl chloride resin film containing a plasticizer, the plasticizer bleeds from the inside to the surface,
This hinders the adhesion of the printing ink, so the surface to be printed is wiped off with a cloth soaked in alcohol before printing.

[0004]

The surface tension of the conventional soft vinyl chloride resin film surface is 37 dyn / cm.
Because of the following, the adhesion between the ink and the soft vinyl chloride resin film is weak, and especially when the entire surface is printed, the ink can be easily peeled off by the theropic test in which a cellophane tape is stuck on the printed surface and peeled off. However, the durability was poor in practical use.

The printing method of the present invention eliminates the above-mentioned conventional drawbacks, improves the adhesion between the soft vinyl chloride resin film and the ultraviolet curable ink, and provides a printing film having excellent durability. It is an object to provide a printing method on a film.

[0006]

The method for printing on a soft vinyl chloride resin film of the present invention comprises printing a UV-curable ink on one side of a soft vinyl chloride resin film containing a soft vinyl chloride resin and a plasticizer. In the printing method of irradiating the printed surface with ultraviolet rays to cure the ultraviolet curable ink, the surface tension of the soft vinyl chloride resin film surface on which the ultraviolet curable ink is printed is 40 to 55 dyn / cm.
And the diameter and height of the protrusions on the surface are 0.5 to 2.0.
It is characterized in that corona discharge treatment is applied so that the thickness becomes μm.

The amount of the plasticizer contained in the soft vinyl chloride resin film used in the present invention is not particularly limited, but is preferably 45 to 60 parts by weight with respect to 100 parts by weight of the soft vinyl chloride resin. When the amount of the plasticizer is less than 45 parts by weight, the film becomes hard due to lack of flexibility when used in a plaster or the like, and when the amount exceeds 60 parts by weight, the plasticizer bleeding to the surface makes the surface sticky. Examples of the plasticizer include high molecular weight adipic acid polyester type, and specific examples thereof include Polysizer W-305EL and Epocizer W100EL manufactured by Dainippon Ink and Chemicals.

Examples of the UV-curable ink used in the present invention include UV Ace (trade name) manufactured by Kuboi Ink Co., Ltd.

In the present invention, the surface tension of the soft vinyl chloride resin film surface to be printed is 40 to 55 dy.
Corona discharge treatment is performed so as to be n / cm. The surface tension of the soft vinyl chloride resin film surface is 40 dyn /
If it is lower than cm, sufficient adhesion to the ultraviolet curable ink cannot be obtained. Moreover, the surface tension is 55 dyn / cm.
When the corona discharge treatment is performed to a higher temperature, the surface of the soft vinyl chloride resin film is burnt and becomes black, or pinholes are generated.

The printing film obtained by the printing method of the present invention is provided with a pressure-sensitive adhesive layer on the surface opposite to the printing surface, or a release paper or the like is laminated on the pressure-sensitive adhesive layer to produce a plaster or a pressure-sensitive adhesive tape for packaging. It is suitable for use as.

[0011]

According to the printing method of the present invention, the ultraviolet curable ink is subjected to corona discharge treatment so that the surface tension of the soft vinyl chloride resin film surface on which the ultraviolet curable ink is printed is 40 to 55 dyn / cm. And the soft vinyl chloride resin film can be adhered to each other.

[0012]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is an explanatory view showing an embodiment of the method of the present invention. For 100 parts by weight of soft vinyl chloride resin, 45 parts by weight of a polyester plasticizer as a plasticizer, 5 parts by weight of titanium oxide
175, in which a pressure-sensitive adhesive layer is laminated on one side of a white soft vinyl chloride resin film 11 in which a weight part and a stabilizer such as stearic acid are mixed, and a release paper is laminated on the pressure-sensitive adhesive layer surface.
Roll out 1 mm wide bandage base 1 from roll
While running at a speed of 0 m / min in contact with the semicircle of the impression cylinder 5, the adhesive tape layer of the adhesive plaster base material 1 on the opposite side to the soft vinyl chloride resin film 11 surface, the corona discharge device 2
The corona discharge treatment was performed to adjust the surface tension of the soft vinyl chloride resin film 11 surface to 48 dyn / cm.

After that, as the UV curable ink 3 (trade name: UV Ace, yellow, manufactured by Kuboi Ink Co., Ltd.) is applied to the entire surface of the corona discharge treated by the first printing device 31 with a thickness of 6 μm, and the applied surface is exposed to ultraviolet rays The metal halide lamp of the irradiation device 41 irradiates the ink with ultraviolet rays at 160 w / cm to cure the ink, and then the same ultraviolet curable ink 3 as described above is applied onto the cured ultraviolet curable ink 30 in the second printing device. Printing was performed again with 32, and the same amount of ultraviolet rays as described above was irradiated with ultraviolet rays by the ultraviolet ray irradiation lamp 42 to be cured to obtain a printed surface having a thickness of 10 μm. On the printed surface of this soft vinyl chloride resin film 1,
After irradiating the ultraviolet ray again with the ultraviolet ray irradiating device 43, the slitting device 6 slits it into a width of 78 mm to obtain a roll 10 of the adhesive bandage.

In this embodiment, the step of printing / curing the ultraviolet curable ink was carried out twice, but even if it was carried out only once, it would take 3 steps.
It may be performed more than once, and when printing is performed multiple times, ultraviolet rays are irradiated each time printing is performed.

Further, in this embodiment, a soft vinyl chloride resin film having a pressure-sensitive adhesive layer and a release paper already laminated on one surface was used, but only a soft vinyl chloride resin film without these layers laminated. It is, of course, possible to print on.

(Comparative Example 1) The surface tension is 34 dyn / cm.
A soft vinyl chloride resin film was printed in the same manner as in the example except that the conventional soft vinyl chloride resin sheet was used.

Comparative Example 2 A soft vinyl chloride resin film was printed in the same manner as in Example 1 except that the soft vinyl chloride resin film was subjected to corona discharge treatment so that the surface tension of the soft vinyl chloride resin film was 56 dyn / cm.

Performance Evaluation The corona discharge treated surface of the soft vinyl chloride resin film before printing in the above Examples and Comparative Examples 1 and 2 is observed, and then a cellophane tape is attached to the printed surface after printing and peeled off. A selopic test was performed to check the presence or absence of peeling of the print.
The results are shown in Table 1.

[0019]

[Table 1]

As can be seen from Table 1, in the examples, there was no abnormality on the soft vinyl chloride resin film surface before printing, and there was no peeling of the prints by the theropic test. On the other hand, since the surface tension of Comparative Example 1 is weak, the adhesion between the soft vinyl chloride resin film and the printing ink is weak and peeling occurs, and the surface tension of Comparative Example 2 is 55 dyn / c.
Since the corona discharge treatment was performed until it exceeded m, the soft vinyl chloride resin film surface subjected to the corona discharge treatment turned black and pinholes were generated.

[0021]

EFFECT OF THE INVENTION The method of the present invention has the above constitution, and since the base material is a soft vinyl chloride resin film containing 45 to 60 parts by weight of a plasticizer, it is highly flexible. The surface tension of the film surface is 40-55 dy
Since the corona discharge treatment is performed so as to be n / cm, it is possible to enhance the adhesion to the ultraviolet curable ink and obtain a printing film having excellent durability.

Further, if corona discharge treatment is performed only when the first ink layer is provided, and if printing is performed a plurality of times thereafter, the ink layer having a desired thickness can be adhered by simply performing an ultraviolet trading company. It can be formed with good properties.

Further, since the ultraviolet curing type printing ink is used as the printing ink, no organic solvent gas is generated, which is preferable in terms of safety and hygiene, and there is no problem such as odor.

[Brief description of drawings]

FIG. 1 is an explanatory diagram for explaining an embodiment of the present invention.

[Explanation of symbols]

 1: Base material band for adhesive plaster 2: Corona discharge device 3: UV curable ink 5: Impression cylinder 10: Material band for adhesive plaster 41, 42, 43: UV irradiation device

Claims (1)

[Claims] 1. A printing method in which a UV-curable ink is printed on one side of a soft vinyl chloride resin film containing a vinyl chloride resin and a plasticizer and the printed surface is irradiated with UV rays to cure the UV-curable ink. So that the surface tension of the soft vinyl chloride resin film surface on which the ultraviolet curable ink is printed is 40 to 55 dyn / cm, and the diameter and height of the protrusions on the surface are 0.5 to 2.0 μm. A method for printing on a vinyl chloride resin film, characterized by being subjected to corona discharge treatment.