JPH11323790A - Release paper and pressure sensitive adhesive sheet and processing of releasing surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fine pressure sensitive adhesive sheet easy in manufacturing by making a release paper having many inverted quadrangular pyramid like fine recessed parts slantingly located on the releasing surface of the belt like base paper. SOLUTION: The release paper 1 is obtained by embossing the belt like base paper having releasing processed surface C by an embossing roll having many quadrangular pyramid like fine projecting parts on the surface to form many inverted quadrangular pyramid like fine recessed parts 2 arranged slantingly to the longitudinal direction L of the base paper in tilt angle θ of 30 deg.<=θ<=60 deg. and setting the releasing surface to have the quadrangular pyramid like fine recessed parts having length A of one side of the bottom of 0.1 mm<=A<=2 mm, the depth H of the recessed part 2 of 0.003 mm<=H<=0.1 mm and the space W between adjacent fine recessed parts 2 of 0.02<=W<=2 mm. The pressure sensitive adhesive sheet is obtained by applying the pressure sensitive adhesive on the releasing processed face C of the releasing paper 1, filling the adhesive in the fine recessed part 2 and then tightly laminating the surface sheet body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a release paper, an adhesive sheet, and a method for processing a release treated surface.

[0002]

2. Description of the Related Art Conventionally, a release paper having a large number of recesses as described below is used as a release paper to be used by being superposed on an adhesive sheet described in Utility Model Registration Publication No. 2503717 already proposed by the present inventors. Have been. That is, when the concave portion is in the shape of an inverted quadrangular pyramid, each side of the square on the bottom surface of the quadrangular pyramid is perpendicular to the longitudinal direction of the release paper (the direction in which the fibers are arranged).
A truncated quadrangular pyramid-shaped small projection as shown in FIG. 3 of the above publication was formed on the surface of the adhesive layer so as to face parallel.

[0003]

However, when manufacturing a large number of small inverted quadrangular pyramid-shaped recesses using an embossing roll when manufacturing the above-described release paper, a strip-shaped material for the release paper is required. Unwind the paper from the unwind roll,
Unless the feeding and winding tension are increased when the material is passed through the embossing roll and then wound up by the winding roll, "wrinkles" may occur in the material. However, in order to increase the feeding tension, the winding strength of the material must be increased. However, when the winding strength is increased, the winding has been rubbed.

[0004] Further, in the release paper, there is a possibility that a distortion may occur after the formation of the concave portion, thereby causing waving. In an extreme case, the adhesive processing for laminating the adhesive layer could not be performed. In addition, even when the pressure-sensitive adhesive processing can be performed, the pressure-sensitive adhesive sheet may be warped, making printing on the surface difficult. On the other hand, when the material is a plastic film, a concave portion having a predetermined depth cannot be formed unless the operation speed is reduced.

Accordingly, the present invention solves the above-mentioned problems, and can efficiently form a good-shaped concave portion without forming "wrinkles" or "distortion" after forming the concave portion. It is an object of the present invention to provide a release paper (film) having an advantageous adhesive property and an adhesive (processed) sheet formed thereby. Further, it is an object of the present invention to provide a method of manufacturing the same (a method of processing a surface to be peeled).

[0006]

In order to achieve the above object, the release paper according to the present invention is inclined at an inclination angle of 30 ° to 60 ° with respect to the longitudinal direction of the strip-shaped material paper whose surface has been subjected to the release treatment. A large number of independent inverted truncated quadrangular pyramid-shaped micro-recesses having a bottom surface of a quadrangle formed by the four sides are arranged on the separation-treated surface.

Further, the adhesive (worked) sheet according to the present invention is characterized in that a square formed by four sides inclined at an inclination angle of 30 ° to 60 ° with respect to the longitudinal direction of the strip-shaped material paper whose surface has been peeled off has a bottom surface. A large number of independent inverted truncated pyramid-shaped minute concave portions are arranged on a release processing surface, and a release paper and a large number of independent minute convex portions stacked on the release processing surface and filled into the minute concave portions are formed. And a surface sheet body laminated on the adhesive layer.

Further, the length of one side of the bottom surface of the inverted quadrangular pyramid is set in the range of 0.1 mm to 2 mm, and the depth of the recess is set in the range of 0.003 mm to 0.1 mm. The distance between adjacent recesses is set in the range of 0.02 mm to 2 mm. Preferably, the square is a square or a rhombus.

Further, the method for processing a peeled surface according to the present invention is characterized in that a plurality of independent truncated quadrangular pyramids each having a bottom surface formed by quadrangles formed by four sides inclined at an inclination angle of 30 ° to 60 ° with respect to the circumferential direction. Rolling and pressing the embossing roll having a micro convex portion on the surface against the strip-shaped material paper the surface of which has been peeled, and 30 ° ~ 60 to the longitudinal direction of the strip-shaped material paper
A large number of independent inverted truncated pyramid-shaped minute concave portions having a bottom surface of a quadrangle formed by four sides inclined at an inclination angle of ° are formed on the peeling-treated surface.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 3 shows a magnified view of the material of the release paper. The material paper 11 is in the form of a (long) strip and is generally rolled. And, as shown in FIG. 3, it is composed of a sheet substrate 4, a resin layer 5 and an auxiliary resin layer 6.

The material paper 11 for the release paper is made of paper or a plastic film as the material of the sheet substrate 4. The thickness T of the sheet substrate 4 is 25 μm ≦ T.
It is preferred to be ≦ 250 μm. (That is, in the present invention, when the material of the sheet substrate 4 is plastic,
It is called "release paper". )

FIG. 1 shows an embodiment of a release paper according to the present invention. This release paper 1 has a surface (shown in FIG. 3) with respect to a longitudinal direction L of a strip-shaped material paper 11 whose surface is subjected to a release treatment. 30 ° -60 °
A large number of independent inverted truncated pyramid-shaped micro-recesses 2... Having a bottom surface of a square formed by four sides inclined at an inclination angle θ are arranged on the entire surface of the peeling-processed surface C.

More specifically, as shown in FIG.
The release paper 1 has a large number of independent minute concave portions 2 on the release processing surface C side and a large number of small protrusions 17 formed on the other surface D side corresponding to the concave portions 2. Consists of body 3. As shown in FIG. 7, the shape of the minute concave portion 2 is an inverted truncated pyramid having a “rhombic” having four sides inclined at an inclination angle θ of 30 ° to 60 ° with respect to the longitudinal direction L and having a bottom surface. It is free to configure.

More specifically, the laminate 3
Is the sheet-like substrate 4 (as shown in FIGS. 2 and 3)
And a resin layer 5 made of plastic such as polyethylene formed on one surface 4a of the sheet-like base material 4 in a covering shape, and an auxiliary resin layer 6 of a similar material formed on the other surface 4b in a covering shape. Is done. Note that the resin layer 5 is subjected to a peeling treatment thereon.

Further, as shown in FIG. 8A, the other surface D side may be a flat surface (omitting the small ridges 17 in FIG. 2). That is, the auxiliary resin layer 6 is in a planar state. Alternatively, as shown in FIG. 8B, the auxiliary resin layer 6 may be omitted on the other surface D side.

In the recesses 2 shown in FIGS. 1 and 2 (or FIGS. 7 and 8), the length A of one side of the bottom surface of the inverted quadrangular pyramid is in the range of 0.1 mm ≦ A ≦ 2 mm. And the depth H of the recess 2 is set in the range of 0.003 mm ≦ H ≦ 0.1 mm, and the interval W between the adjacent recesses 2 is set to 0.02 mm.
≤ W ≤ 2 mm.

The reason for setting the above-mentioned value is that when the length dimension A of one side (square or rhombus) of the bottom surface of the inverted quadrangular pyramid is smaller than 0.1 mm, the air which is too fine to be trapped at the time of sticking is removed. If it is unsuitable for elimination, and if it is larger than 2 mm, it is too sparse, and it is difficult to eliminate air that gets stuck when pasting.

If the depth H of the concave portion 2 is smaller than 0.003 mm, it is too shallow to prevent the air that bites when pasted, and if it is larger than 0.1 mm, the depth becomes deep, so that it is filled. The amount of the pressure-sensitive adhesive becomes excessive, which causes a problem that the pressure-sensitive adhesive protrudes when the pressure-sensitive adhesive sheet is cut. Further, when the interval W between the recesses 2 and 2 is smaller than 0.02 mm, the formed air exclusion groove becomes narrow and air cannot be evacuated outward. If it is larger than 2 mm, the convex portions become sparse and a predetermined adhesive force cannot be obtained.

Meanwhile, the fiber material direction of the belt-shaped material paper 11 is arranged in the longitudinal direction L. That is, when producing a paper or plastic film, various processing is performed on the material in the running (longitudinal) direction, so that the fibers are arranged in the longitudinal direction, which is the running direction. Therefore, the strength in the longitudinal direction is significantly higher than that in the width direction.

Therefore, it is a very difficult task to make the 部 convex portion penetrate at a right angle across this fiber, but in the present invention, as described above, 30 ° ≦ θ ≦ 60 ° Since each side of the minute concave portion 2 is arranged with an inclination, concave processing can be performed with a relatively small pressing force.

When the sheet base material 4 of the band-shaped material paper 11 is paper, various materials can be used.
It is also preferable to use high quality paper of about g / m ² to 200 g / m ² . Then, as described above, the surface of the paper is laminated with polyethylene or the like. The thickness of the laminate is 10μ
m to 30 μm.

Further, a hard plastic such as a polyester film is often used for the release film (band material paper 11). In this case, the concave processing can be performed with a relatively small pressing force by the method of the present invention. In addition, as a material of the plastic, polyethylene, polypropylene, polyester and the like can be used.

Next, a method of processing a release surface of the release paper 1 will be described. FIG. 4 is an overall simplified explanatory view of an apparatus for processing a peeled surface. FIG. 5 is an enlarged perspective view of an essential part of the embossing roll 8 used for the embossing roll 8. FIGS. 4 and 5
As shown in the figure, a large number of independent truncated quadrangular pyramid-shaped small projections 7 each having a square or rhombus formed by four sides inclined at an inclination angle β of 30 ° to 60 ° with respect to the circumferential direction M.
Is formed on the entire surface to form an iron embossing roll 8.

For example, the diameter of the embossing roll 8 is set to 300 mm.
Further, the minute protrusion 7 has a length dimension of one side of the upper surface.
0.30 mm, the length of one side of the bottom surface is 0.50 mm, the interval between the adjacent projections 7, 7 is 0.05 mm, the height is 0.065 mm, and the inclination angle β is set to 45 °.

Next, a paper roll (or rubber roll) 9 corresponding to the embossing roll 8 is provided, and a predetermined pressing force is applied to both ends of the embossing roll 8 having a roll surface length of 1300 mm. Then, the long (in the state shown in FIG. 3) strip-shaped material paper 11 wound around the feeding roll 12 is fed in the direction of arrow E, and the material paper 11 is caused to travel in the direction of arrow J toward the embossing roll 8.

Subsequently, the embossing roll 8 and the paper roll 9 are rolling in the directions of arrows F and G, respectively. Corresponding concave portions 2 of θ = 45 ° are formed on the entire surface of the stripping-processed surface C of the strip-shaped material paper 11 (see FIGS. 1 and 2).
Thereafter, the release paper 1 travels in the direction of arrow K, and is wound on the take-up roll 13 in the direction of arrow P.

For example, when the sheet base material 4 of the belt-shaped material paper 11 in the state of FIG. 3 is a high-quality paper having a basis weight of 110 g / m ² , the feeding tension and the unwinding tension are 30 kg and 50 m / min, respectively. When formed under the conditions of the speed, the concave portions 2 having a depth dimension H of 0.04 mm were formed without generating "wrinkles". When the recesses 2 were formed under the same conditions in a plastic film having a thickness T of 0.038 mm, the recesses 2 having a depth H of 0.020 mm were formed.

As shown in FIG. 6 (a), the release paper 1 is coated with an adhesive on the side of the release processing surface C and partially filled in the minute recesses 2 of the release paper 1. In other words, the minute projections
19 is formed. Thereafter, the adhesive is dried to form the adhesive layer 14. Next, one surface of the top sheet 15 is brought into close contact with the surface of the adhesive layer 14 opposite to the release paper 1 side, and the adhesive layer 14 and the release paper 1 are brought into close contact with each other to form an adhesive sheet body 16.
This adhesive sheet body 16 can easily peel off only the release paper 1. At the time of use, the release paper 1 is peeled off, and the top sheet 15 is attached to another object via the adhesive layer 14.
Can be pasted.

The present invention can be freely changed in design other than the above-described embodiment. For example, the minute recesses 2 have a length A of one side of the bottom surface, a depth H, and a spacing W between the adjacent recesses 2 and 2 are 0.1 mm ≦ A ≦ 2 mm, 0.003 mm ≦
It can be freely changed in the range of H ≦ 0.1 mm and 0.02 mm ≦ W ≦ 2 mm. Further, in addition to the rhombus shown in FIG. 7, a parallelogram or another square may be used.

[0031]

The present invention has the following remarkable effects by the above-mentioned structure.

According to the first or second aspect, the recesses 2 are formed by sides having a direction different from the direction perpendicular to the longitudinal direction of the release paper 1, so that the release paper 1 is peeled off with a smaller pressing force and tension than in the prior art. The concave portions 2 can be formed on the processing surface C. In addition, since the beautiful release paper 1 having little "distortion" and no "wrinkles" on the surface can be formed, it is easy to perform the adhesive processing, and the beautiful adhesive sheet body 16 can be produced.

When a conventional release paper in which the sides of a truncated pyramid are perpendicular and parallel to the longitudinal direction is subjected to pressure-sensitive adhesive processing, a convex portion is formed on the surface of the pressure-sensitive adhesive. When the adhesive is plastically deformed and the valleys (concave grooves) are filled, the perpendicular direction is filled quickly and is not uniform. This hinders the escape of gas generated after sticking to the plastic. However, according to the present invention, the speed of filling is uniform in any direction, so that the hindrance is reduced.

(According to claim 3 or 4), concave processing is easy, and accurate concave portions 2 can be formed. Also the adhesive layer
There is no sticking of air between 14 and other objects, so no so-called "bulging" occurs. In addition, the gas generated between the adhesive layer 14 and another object to which the adhesive layer 14 has been attached can be naturally removed, and "bulging" does not occur.

(According to claim 5) the embossing roll 8
The projections 7 have an inclination angle β with respect to the circumferential direction M on the surface of.
Are formed, the convex portions 7 are pressed at positions shifted from the fiber direction of the release paper 1. Therefore, since the convex portions 7 are easily bitten, accurate concave portions 2 can be formed on the release paper 1 without generating "distortion" or "wrinkles". In addition, processing can be performed at a high operation speed, and efficiency is high.

Further, the depth of the concave grooves (valleys) formed between the minute protrusions 19 on the surface of the adhesive layer 14 can be equalized in any direction, and gas generated after pasting is released. Above, preferred. In other words, the direction of the concave groove portion (valley portion) is lost (as the adhesive sheet 16), and the gas escapes in all directions, so that "blowing" can be prevented.

[Brief description of the drawings]

FIG. 1 is an enlarged plan view of a main part showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional side view taken along line BB of FIG.

FIG. 3 is an enlarged sectional side view showing a state before processing.

FIG. 4 is a simplified explanatory view showing a processing method.

FIG. 5 is an enlarged perspective view of a main part.

FIG. 6 is an enlarged sectional side view showing various embodiments as an adhesive sheet.

FIG. 7 is an enlarged plan view of a main part of a modification example replacing FIG. 1;

FIG. 8 is an enlarged cross-sectional view showing a modified example replacing FIG. 2;

[Explanation of symbols]

 2 Micro concave part 7 Micro convex part 8 Embossing roll 11 Strip material paper 14 Adhesive layer 15 Top sheet 16 Adhesive sheet 19 Micro convex part A Length dimension C Release processing surface H Depth dimension L Longitudinal direction M Circumferential direction W Interval dimension θ Slope Angle β Tilt angle

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // C09J 7/00 C09J 7/00

Claims (5)

[Claims] 1. A large number of independent rectangular bases formed by four sides inclined at an inclination angle .theta. Of 30.degree..ltoreq..theta..ltoreq.60.degree. With respect to a longitudinal direction L of a strip-shaped material paper 11 whose surface has been peeled. Separated surface C of the inverted truncated pyramid-shaped minute recesses 2.
A release paper, wherein the release paper is disposed on a paper. 2. A large number of independent rectangular bases each formed by four sides inclined at an inclination angle θ of 30 ° ≦ θ ≦ 60 ° with respect to the longitudinal direction L of the strip-shaped material paper 11 whose surface has been subjected to the release treatment. Separated surface C of the inverted truncated pyramid-shaped minute recesses 2.
, A pressure-sensitive adhesive layer 14 having a large number of independent fine convex portions 19 laminated on the release-treated surface C and filled into the fine concave portions 2..., And laminated on the pressure-sensitive adhesive layer 14 A pressure-sensitive adhesive sheet, comprising: a top sheet body 15; 3. A length dimension A of one side of the bottom surface of the inverted quadrangular pyramid is set in a range of 0.1 mm ≦ A ≦ 2 mm, and a depth dimension H of the concave portion 2 is set to 0.003 mm ≦ H ≦ 0.1 mm. And the distance W between the adjacent recesses 2 is set to 0.02.
The release paper or the pressure-sensitive adhesive sheet according to claim 1, wherein the range is set to mm ≦ W ≦ 2 mm. 4. The release paper or pressure-sensitive adhesive sheet according to claim 1, wherein the square is a square or a rhombus. 5. A large number of independent truncated quadrangular pyramid-shaped micro-projections 7 having a bottom surface of a quadrilateral formed by four sides inclined at an inclination angle β of 30 ° ≦ β ≦ 60 ° with respect to the circumferential direction M. The embossing roll 8 on the surface is rolled and pressed against the strip-shaped material paper 11 whose surface has been peeled off, and
The above-mentioned peeling treatment is performed on a large number of independent inverted truncated quadrangular pyramid-shaped minute recesses 2 having a bottom surface of a square formed by four sides inclined at an inclination angle θ of 30 ° ≦ θ ≦ 60 ° with respect to the longitudinal direction L of 11. A method of processing a peeled surface, wherein the surface is formed on a surface C.