JPH0124192B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a type of adhesive paper having an uncoated area surrounded by an annular adhesive coated area on the back side.

Conventionally, as this type of adhesive paper, an adhesive label as shown in FIG. 1 is known. In the drawings, a is a label surface base material, b is an adhesive coating layer applied in a circular manner around the periphery of the back surface, c is an uncoated surface portion without an adhesive layer surrounded by the annular adhesive coating layer b, and d indicates release paper.

The manufacturing method for this adhesive label A is based on a pattern coating method as detailed below, which has the disadvantage of requiring a specially prepared adhesive. There was a drawback that it was not possible to manufacture various labels by selecting adhesives with free characteristics. The manufacturing method includes, for example, transferring and forming an annular pattern coating b using an adhesive solution on the surface d of a release paper as shown in the second figure using a gravure method, a screen method, etc. It is manufactured by polymerizing the back side of

In this transfer process, if the adhesive solution has stringiness, the predetermined annular pattern will become stringy, or the pattern will be distorted, resulting in a predetermined annular pattern on the label substrate surface. This often results in inconveniences such as inability to obtain an annular pattern of a predetermined shape with high precision. Therefore, if you prepare an adhesive with a polymer composition, additives, solvents, etc. that is difficult to string, and use such a specific adhesive, the specified adhesive label will not be able to be manufactured smoothly. It was inconvenient that I couldn't do it. However, because the product is such an adhesive, it has the disadvantage that, for example, any various adhesives cannot be used, its adhesive properties are limited, and the adhesive solution must be diluted to a viscosity that can be applied by screen or gravure methods. Therefore, there was an inconvenience in that it was not possible to obtain a desired desired coating film thickness and it was not possible to produce a pressure-sensitive adhesive label suitable for use with a stronger seal. The present invention solves the above-mentioned drawbacks of the conventional manufacturing method of this type of adhesive label, and makes it possible to use a general adhesive with temporary threading properties to produce various types of adhesive labels whose adhesive properties can be freely changed. This is a double-sided adhesive sheet in which a release paper with relatively high peel resistance and a release paper with relatively low peel resistance are polymerized on both sides of an adhesive coating layer. A half-punching cutting process or a full-punching cutting process is performed to form a half-punching mold part or a complete punching mold part with a desired ring shape, and then this ring-shaped part and a release paper with low peeling resistance are removed. Then, a surface base material sheet is attached to the exposed adhesive coated surface and polymerized, and the resulting polymer sheet is semi-punched and cut into a desired shape by surrounding a circular punch hole from the surface side of the surface base material sheet. The method is characterized in that the back surface of the surface base sheet section cut into a desired circular shape has an uncoated section surrounded by an annular adhesive coated section.

Next, embodiments of the present invention will be described with reference to the accompanying drawings. First, a wide belt-shaped double-sided adhesive sheet 1 as shown in the third figure is prepared. The double-sided pressure-sensitive adhesive sheet 1 has two intermediate pressure-sensitive adhesive layers and release papers 3a and 3b having mutually different peel resistances bonded to both surfaces thereof.

The sheet 1 is manufactured, for example, as follows. Release paper 3a with relatively high peel resistance and release paper 3b with relatively low peel resistance are prepared in advance by changing the type of silicone release agent, and release paper 3a with high peel resistance is prepared in advance.
A desired adhesive solution such as polyacrylic acid ester type or rubber type is uniformly applied to the release agent-treated surface using a roll coater or the like and dried to form an adhesive coating layer 2 with a thickness of about 30 μm on the upper surface. A release paper 3b having relatively low peeling resistance is adhered to the upper surface of the double-sided pressure-sensitive adhesive sheet 1 through the release agent-treated surface. The base material of the release papers 3a and 3b is made of paper such as bleached kraft paper, glassine paper, polyethylene laminate paper, or plastic film such as polypropylene or polyester. The ratio of peel resistance values of the release papers 3b and 3a is 1:1.1 or more, generally 1:1.2 to 5.
It is preferable to use one of As an alternative to the above, it goes without saying that the adhesive may be applied on the upper surface of the release paper 3b, and the release paper 3a may be adhered to the adhesive coating layer 2 under pressure.
Further, a support such as a nonwoven fabric or Japanese paper may be provided inside the adhesive coating layer.

Next, a half-punching cut 4 is applied to the large double-sided adhesive sheet 1 to cut from the side of the release paper 3a with high peeling resistance to the adhesive coating layer 2, and a predetermined ring shape and size are formed at regular intervals. For example, small circular half-punching mold parts 5, 5, . . . are formed (FIGS. 4 and 5).
Next, the release paper 3b is peeled off and the half-punching mold parts 5, 5... are removed to form a hole 6 in the place where the mold part 5 was removed as shown in FIGS. 6 and 7, and a release agent coated layer is formed. Assume that one side of 2 is exposed on the surface. When the release paper 3b is peeled off, the adhesive coating layer 2 can be reliably left on the release paper 3a since the peel resistance of the release paper 3a is made greater than that of the release paper 3b in advance.

Next, the small circular punched holes 6, 6, shown in FIGS. 6 and 7, from which the release paper 3b has been removed...
A strip-shaped surface base material sheet 7 having at least the same width as the above-mentioned sheet is pressure-affixed to the sheet on which the adhesive coating layer 2 is exposed using a roll press p as shown in Figure 8 to form a pasting paper. A polymer sheet 8 for use is obtained. 9th
The figure shows a cutaway view of a part of it.

The polymer sheet 8 constructed in this manner is subjected to a half-punching cut 9 that cuts from the surface base sheet 7 side to the adhesive coating layer 2, surrounding each of the small circular punched holes 6 on the lower surface of the polymer sheet 8 to form the desired shape. For example, a half-punching mold part 10 having a circumferential shape and size of, for example, an oval shape is formed. (FIGS. 10 and 11) This oval half-punching mold part 10 thus constitutes, in other words, the product that is the object of the present invention.

Usually, these oval semi-punching mold parts 10, 10...
In order to make ... into an adhesive label product, the polymer sheet 8 is passed through a printing machine, the required printing indication S is made on the surface of each mold part 10, and then the printed mold is printed on the surface of the release paper 3a. In order to leave only the parts 10, 10, ie, the adhesive labels 10, 10, the waste parts 7 of the surface base sheet 7 are removed as shown in FIGS. 12 and 13.
With the exception of a, the adhesive paper 10 of the present invention is obtained in which multiple polymers are adhered on a strip-shaped release paper 3a at regular intervals. The surface base material sheet 7 may have a suitable display printed on its surface in advance, and the final product adhesive paper 10 may be of a type that does not have any surface printing, depending on the application. Of course, it can also be used as a product.

Materials for the surface base sheet 7 include paper base materials such as high quality paper, kraft paper, and cast coated paper; plastic base materials such as vinyl chloride, polyester, and polypropylene; metallized plastic film base materials; and ordinary label stickers such as metal foil. The base material used for this purpose is arbitrarily selected and used.

The adhesive paper 10 of the present invention is peeled off from the release paper 3a and is attached to the mouth 1 of the container 11, for example, as shown in FIG. 14.
2 is used for sealing by pasting and sealing two parts of the annular adhesive coating on the periphery thereof. The container 1
If the opening 12 of 1 has a plug 13 on the surface of which it is undesirable to adhere adhesive, the central part of the back side of the release paper 3a is the non-adhesive surface 1 without adhesive.
4, the top surface of the stopper 13 is not contaminated with adhesive. In addition, when the air permeable surface base material 7 is used, the uncoated portion 14 maintains air permeability and is used for purposes suitable for this purpose.

FIG. 15 shows a modification of the present invention, in which the double-sided pressure-sensitive adhesive sheet 1 in the above embodiment is cut in half by punching and processed with a predetermined circular punching die (FIGS. 4 and 5).
Alternatively, this may be completely punched and cut 4' to form the complete punching mold parts 5', 5'', etc. After that, the complete punching mold parts 5' and the release paper 3b may be formed. Other than this, the subsequent manufacturing steps are carried out in the same manner as in FIGS. 6 to 13 of the previous embodiment to obtain a similar product.

As described above, according to the present invention, a double-sided adhesive sheet is prepared by pasting and polymerizing release papers with different peel resistances on both sides of the adhesive coating layer, and this is cut into a desired shape by half punching or complete punching. A punching die with a desired circular shape is formed using the above method, and then the punching die and the release paper on the side with lower peeling resistance are removed, and a separately prepared surface base is applied to the exposed part of the adhesive coating layer in which the punching holes are formed. The polymer sheet is pasted under pressure, and the resulting polymer sheet is then cut into a desired circular shape by encircling the punched holes from the surface side of the polymer sheet. There are various types of adhesive papers that do not have any of the above-mentioned disadvantages caused by the pattern coating method, use a desired adhesive, have a desired adhesive strength, and are equipped with an annular adhesive coated layer that has an inner surface without adhesive. It has the effect of being able to be manufactured freely.

[Brief explanation of drawings]

Figure 1 is a slope view with part of the pasted paper cut out, Figure 2
The figures are perspective views showing the conventional manufacturing method, Figures 3 to 1.
Fig. 3 shows an example of the manufacturing method of the present invention, Fig. 3 is a cross-sectional view of a part of a double-sided pressure-sensitive adhesive sheet, Fig. 4 is a perspective view of a part of the sheet that has been cut by half punching, and Fig. 5 is a cross-sectional view of a part of the double-sided pressure-sensitive adhesive sheet. The figure is a cross-sectional view taken along the - line in Figure 4, Figure 6 is a cross-sectional view of a part of the process in which the punching die and one sheet of release paper are removed, and Figure 7 is a cross-sectional view taken along the line -
Figure 8 is a perspective view of a part of the polymer sheet, Figure 8 is a perspective view of the pressure lamination process of the surface base sheet, Figure 9 is a sectional view of a part of the polymer sheet, and Figure 10 is a half of its outer periphery. A slope view of the process of punching and cutting, Figure 11 is the first
Figure 0 is a cross-sectional view taken along the line XI-XI, Figure 12 is a perspective view of the product in the process of removing unnecessary parts, Figure 13 is a cross-sectional view taken along the ~ line in Figure 12, and Figure 14 shows an example of how the product is used. A cross-sectional view, FIG. 15, shows a cross-sectional view of a part of the process of manufacturing a double-sided pressure-sensitive adhesive sheet in a modification of the present method. 1...Double-sided adhesive sheet, 4...Half punch cutting, 5
... Half punching mold part, 6 ... Punching hole, 7 ... Surface base sheet, 8 ... Polymer sheet, 9 ... Half punching cut of outer periphery, 10 ... Half punching mold part of outer periphery, product, 4′
...Complete punching cut, 9'...Complete punching die part.

Claims (1)

[Claims] 1 A double-sided adhesive sheet made by polymerizing a release paper with a relatively high peel resistance and a release paper with a relatively low peel resistance on both sides of the adhesive coating layer is subjected to a half punch cutting process or a complete punch cutting process to form the desired outline. A semi-punching mold part or a complete punching mold part with a shape is formed, and then this round shape part and a release paper with low peeling resistance are removed, and a surface base sheet is pasted on the exposed adhesive coated surface and polymerized. The obtained polymer sheet is subjected to semi-punching cutting into a desired shape from the side of the surface base material sheet, surrounding the circular punched hole, and then cut into the back surface of the surface base sheet portion cut into the desired circular shape. 1. A method for producing adhesive paper, characterized in that it has a non-coated area surrounded by an annular adhesive coated area.