JPH09207097A - Cutting method for ultraviolet curing type adhesive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the falling off and scattering of an adhesive material, and moreover the lowering of cutting accuracy due to the above accidents by previously ultraviolet-hardening a prearranged cutting portion on adhesive sheets in the case of cutting ultraviolet curing type adhesive sheets. SOLUTION: Long ultraviolet curing type adhesive sheets 4 wound round a winding out roll is made to proceed at fixed speed toward a winding roll as the sheet is rewound. While the sheets proceed like this, ultraviolet rays 3 are irradiated to a prearranged cut portion 8 through a converging fiber or a converging lense 2 from an ultraviolet generating device for hardening the portion 8. After hardening the portion 8, the adhesive sheet is cut continuously in a proceeding direction, namely a longitudinal direction, by a cutting device 7. Two sheets 4A, 4B narrowed in width by a cut portion 9 are severally wound round a winding roll.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting UV-curable adhesive sheets, and more particularly to a method for cutting the above long sheets in the longitudinal direction to narrow the width.

[0002]

2. Description of the Related Art To cut a long UV-curable adhesive sheet in the longitudinal direction to make it narrower, while rewinding the long object wound on a roll, It is common to continuously cut in the longitudinal direction (usually cut into a number of strips so as to obtain a predetermined width) and wind this into a required length.

[0003]

However, since the UV-curable pressure-sensitive adhesive generally contains a low-molecular material, it has poor cohesiveness, and when the pressure-sensitive adhesive sheet is cut into a predetermined width, There was a problem in that they fell off and scatter, which adheres to the cutting blade and reduces the accuracy of the cutting width.

In light of the above-mentioned conventional circumstances, the present invention prevents the adhesive from falling off and scattering when cutting the UV-curable adhesive sheets, and prevents the reduction of the cutting accuracy due to this. It is intended.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies in order to achieve the above-mentioned object, and as a result, if the planned cutting site in the UV-curable adhesive sheets is previously UV-cured, the It prevents the adhesive from falling off and scattering.
The present inventors have completed the present invention, knowing that no decrease in cutting accuracy due to this is observed and that good cutting accuracy is obtained.

That is, according to the present invention, when the UV-curable pressure-sensitive adhesive sheet is cut, the region to be cut on the above-mentioned sheet is previously UV-cured, which is characterized in that the UV-curable pressure-sensitive adhesive sheet is cut. The present invention relates to a method of cutting pigeons.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an example of a method of cutting the ultraviolet-curable adhesive sheets of the present invention. FIG. 1 is a schematic side view and FIG. 2 is a schematic plan view.

In both figures, 1 is an ultraviolet ray generator, 2 is a condenser fiber or condenser lens, 3 is ultraviolet rays, 4 is an ultraviolet curing adhesive sheet, 5 is an unwinding roll, and 6 is a rewinding roller. Roll, 7 is a cutting device, 8 is a planned cutting site, and 9 is a cutting site.

The long UV-curable adhesive sheets 4 wound on the unwinding roll 5 are advanced toward the winding roll 6 at a predetermined speed while being unwound. ,
During this process, the planned cutting site 8 is irradiated with the ultraviolet ray 3 from the ultraviolet ray generator 1 through the condenser fiber or the condenser lens 2 to be cured. Cut in the direction. The two sheets 4A and 4B narrowed by the cutting portion 9 are wound around the winding roll 6, respectively.

In this method, as shown in FIG. 2, the irradiation of the ultraviolet ray 3 is performed not only on the planned cutting portion 8 but also on the both ends 10 and 11 in the width direction of the ultraviolet curing adhesive sheet 4. Is desirable. In this case, the two narrow sheets 4A, 4B are both UV-cured at both ends by irradiation of the cut portion 9 and both end portions 10, 11 in the width direction with UV rays. , It works to prevent the adhesive from sticking out to the side surface of the wound body due to the winding pressure. Conventionally, there has been a problem that the above-mentioned protrusion occurs and foreign matter adheres to the protrusion, thereby impairing the appearance of the sheets, but this problem is successfully avoided by the above-mentioned irradiation of ultraviolet rays.

3 to 5 show another example of the method of irradiating ultraviolet rays, FIG. 3 is a schematic side view, FIG. 4 is a schematic front view, and FIG. 5 is a schematic plan view. In these figures, reference numeral 12 is an ultraviolet shielding material, and other reference numerals are the same as those in FIGS.

In this example, the ultraviolet ray 3 from the ultraviolet ray generator 1 is not supplied by a condenser fiber or condenser lens,
By arranging the ultraviolet shielding material 12 at a predetermined portion on the sheet 4, the planned cutting portion 8 and the both ends 10 and 11 in the width direction are irradiated from the gap of the shielding material 12. After irradiating with ultraviolet rays in this way, it is cut in the same manner as described above and wound on the winding roll 6.

In the above method, the ultraviolet ray generator 1 is a low-pressure mercury lamp, an ultra-high pressure mercury lamp, a high-pressure mercury lamp, a deuterium lamp, a metal halide lamp, a xenon lamp, which can generate ultraviolet rays having a wavelength of 400 nm or less. , Excimer laser, etc. The irradiation method may be arbitrary as long as it can irradiate only a predetermined portion, but in order to prevent the whole adhesive from reacting, the irradiation angle is 9 with respect to the irradiation object.
It is good to set it to 0 degrees. The irradiation range can be appropriately selected as long as the characteristics of the adhesive sheet as the irradiation target are not lost. The integrated light quantity of ultraviolet rays is preferably 50 to 5,000 mj / cm ² . If the amount is too small, the ultraviolet curing reaction does not proceed, and if the amount is too large, the curing reaction may proceed to the entire pressure-sensitive adhesive and the properties thereof may be lost, which is not preferable.

The cutting device 7 is an ultraviolet-curable adhesive adhesive sheet.
There is no particular limitation as long as it can achieve the purpose of cutting the pigs. In general, the score, the laser, and the score
A device having a cutting blade such as is used. In addition, in the above example, long adhesive sheets are cut into one strip,
Needless to say, a plurality of cutting devices 7 may be provided in accordance with the cutting to obtain a desired width.

An ultraviolet curable adhesive sheet applied to the present invention
The type 4 is an adhesive sheet or an adhesive tape in which an ultraviolet curable adhesive is provided on an appropriate support film, and usually a separator film is attached for the purpose of protecting the surface of the adhesive. . The material of the pressure-sensitive adhesive is not particularly limited as long as it satisfies the characteristic of ultraviolet curing. Generally, a tacky polymer containing a non-volatile compound having one or more unsaturated double bonds in the molecule is preferably used. In addition, in order to quickly cure the adhesive with ultraviolet rays, the ultraviolet transmittance of the support film is 5%.
It is 0% or more, preferably 75% or more.

[0016]

Next, an embodiment of the present invention will be described in more detail. The UV-curable adhesive sheet used in the examples is manufactured by the following method.

<Production of UV-curable adhesive sheet> 100 parts by weight of an acrylic polymer, 50 parts by weight of polyethylene glycol diacrylate as a curable compound, 3 parts by weight of diphenylmethane diisocyanate, polymerization As an initiator, 3 parts by weight of α-hydroxycyclohexylphenyl ketone was uniformly mixed to obtain a UV-curable adhesive solution. Next, this UV-curable adhesive solution was added to a thickness of 5
40 μm thickness after drying on 0 μm polyester film
It was applied so as to have a thickness of 300 μm and a width of 300 mm to produce a long UV-curable adhesive sheet. This was unwound and wound up on a roll.

Example 1 An ultraviolet curable adhesive sheet having a width of 300 mm wound on an unwinding roll was used, and according to the method shown in FIGS. 1 and 2, the central portion in the width direction of the adhesive sheet was used. (150 from the width direction end
mm part) and both ends of the sheet are irradiated with ultraviolet rays to be hardened, and then continuously cut in the longitudinal direction to prepare two adhesive sheets each having a length of 100 m and a width of 150 mm and wound respectively. I wound it up on a take-up roll.

A cutting device having a shear blade was used, and the cutting device was arranged so as to cut the widthwise central portion (a portion 150 mm from the widthwise end portion) of the adhesive sheet. Further, the ultraviolet irradiation device is disposed on the rear side of the cutting device in the sheet advancing direction, and is arranged at the center portion in the width direction of the adhesive sheet and the sheet.
Both ends were irradiated with ultraviolet light having an integrated light amount of 100 mj / cm ² so that the irradiation range was a circle with a diameter of 10 mm.

The cutting accuracy was calculated by measuring the cutting width at intervals of 50 cm while rewinding one of the two 150 mm wide adhesive sheets wound on the winding roll. Further, the adhesives attached to the cutting blade and the cut surface of one adhesive sheet were collected, and the total weight thereof was measured. These results were as shown in Table 1.

Comparative Example 1 A length of 10 was obtained in the same manner as in Example 1 except that the ultraviolet irradiation device was omitted and cutting was performed without ultraviolet curing.
Two adhesive sheets having a width of 0 m and a width of 150 mm were prepared. The results of measuring the cutting accuracy and the total amount of the pressure-sensitive adhesive attached to the cutting blade and the cut surface of one of the pressure-sensitive adhesive sheets are as shown in Table 1.

[0022]

As is clear from the results of Table 1 above, when cut by the method of Example 1, the total amount of the adhesive adhered to the cutting blade and the adhesive sheet, that is, the adhesive removed during cutting It can be seen that the cutting accuracy is much higher than that when the method of Comparative Example 1 was used for cutting.

[0024]

As described above, according to the present invention, by preliminarily UV-curing the planned cutting site of the UV-curable pressure-sensitive adhesive sheet, it is possible to prevent the pressure-sensitive adhesive from dropping and scattering during cutting. A decrease in cutting accuracy due to this is not observed, and good cutting accuracy can be obtained. Also, in addition to the above-mentioned site to be cut, both ends of the sheets in the width direction are UV-cured,
There is no risk of the adhesive sticking out to the side surface of the roll due to the winding pressure, no foreign matter is found to adhere to this part, and there is little re-adhesion of the adhesive that drops off or scatters during cutting. -It is possible to make pigs.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an example of a cutting method of the present invention.

FIG. 2 is a schematic plan view of the same.

FIG. 3 is a schematic side view showing another example of an ultraviolet irradiation method.

FIG. 4 is a schematic front view of the same.

FIG. 5 is a schematic plan view of the same.

[Explanation of symbols]

 1 UV generator 2 Condenser fiber or condenser lens 3 UV ray 4 UV curable adhesive sheets 4A, 4B UV curable adhesive sheets after cutting 5 Unroll roll 6 Wind up roll 7 Cutting device 8 Planned cutting site 9 Cutting site 10, 11 Sheet width direction both ends 12 Ultraviolet shielding material

Claims (2)

[Claims] 1. An ultraviolet-curable pressure-sensitive adhesive sheet, which is characterized in that when the ultraviolet-curable pressure-sensitive adhesive sheet is cut, the portion to be cut on the above-mentioned sheet is previously UV-cured.
How to cut mosquitoes. 2. When the UV-curable adhesive sheets are cut in the longitudinal direction to narrow the width, both end portions in the width direction are UV-cured in addition to the planned cutting sites on the sheets. The method for cutting an ultraviolet-curable adhesive sheet according to claim 1, wherein the adhesive sheet is cut.