JP2556787B2 - Method for partially coating silicone and method for producing laminated material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for partially coating silicone and a method for producing a laminated material excellent in tear strength and feeling using the method.

[0002]

2. Description of the Related Art Conventionally, in the field of packaging materials, various laminated materials such as a paper base material and a synthetic resin, or a laminated material of synthetic resins are used. However,
Since these laminated materials are usually formed by adhering and laminating each layer over the entire surface, they have a drawback that they are not sufficiently strong against scratching or tearing. As a method for solving this problem, partial adhesive lamination may be considered, but the fact is that a practical method for partial lamination has not been proposed yet.

[0003]

SUMMARY OF THE INVENTION The present invention provides a method for partially coating silicone and a method for producing a partially adhesively laminated laminate material using the coating method. .

[0004]

That is, the first aspect of the present invention is to:
A second method of the present invention is a partial coating method of silicone, which comprises coating a solventless silicone liquid with a coater roll having a convex portion by an offset gravure roll method. Using a coater roll having a convex portion by a gravure roll method, a partial coating is applied to the surface of the thermoplastic resin film laminated on the base material, and then the thermoplastic resin film and the other base material subjected to the partial coating of the laminate And a thermoplastic resin is extruded to be laminated between the layers.

The present inventors have attempted a method of partially applying solvent-type silicone and partially adhering and laminating the same in order to achieve the above object. However, in the case of solvent-type silicone (viscosity 5 to 200 cps), bleeding occurs at the boundary between the coated part and the non-coated part, and the shape (particularly the edge) of the silicone coated part is destroyed to achieve the intended purpose. Was impossible. Therefore, when solvent-free silicone is used, the above problems do not occur, and the silicone is partially coated in a predetermined shape at a predetermined position, and a thermoplastic resin is laminated on the film surface partially coated with silicone by such a method. According to the above, it was found that a partial laminate in which the silicone-coated portion is not bonded and the silicone-uncoated portion is bonded is obtained, and the present invention has been completed.

As the solvent-free silicone used in the present invention, dimethylpolysiloxane having a molecular weight of 10,000 to 25,000 can be preferably used.

The above solventless silicone is partially coated by using an offset gravure roll method using a coater roll having a convex portion. The outline of the offset gravure roll method is shown in FIG. In the figure, 1 is a press roll (metal), 2 is a coater roll (rubber), 3 is a gravure roll (metal), 4 and 5 are metering rolls (4 is rubber, 5 is metal), and 6 is a partially coated object. (Such as a film). On the surface of the coater roll 2, an arbitrary pattern for partial coating is provided by unevenness.

The patterns are illustrated in FIGS. 2 to 5, but FIG.
Is a pattern in which circular projections 7 are provided on the surface of the coater roll 2, FIG. 3 is a pattern in which streak projections 8 are provided in the length direction of the coater roll 2, and FIG. 4 is a streak in the circumferential direction of the coater roll 2. The pattern provided with the convex portions 9, FIG. 5 shows the coater roll 2
In the example in which the concave grooves 10 and 11 are bored in the circumferential direction and the longitudinal direction, respectively, and the rectangular convex portion 12 inevitably formed by the concave grooves 10 and 11 is used as a pattern. The silicone application portion becomes the non-application portion.

In the present invention, the object to be partially coated with silicone is not particularly limited, and may be paper, synthetic resin film, metal foil, woven cloth, non-woven cloth or the like.

In order to produce a laminated material suitable for a packaging material such as a bag by using the above partial coating method, a surface of a thermoplastic resin film laminated on a substrate such as a paper substrate is partially coated with silicone. . Then
A thermoplastic resin is provided between the partially coated thermoplastic resin film surface and another base material, for example, a paper base material, and laminated. In this case, a known laminating method such as hot melt is used, but an extrusion laminating (so-called sandwich laminating) method is preferable.

FIG. 6 shows the case of laminating by the poly sandwich laminating method. That is, the laminate 13 with the base material whose silicone resin is partially coated on the surface of the thermoplastic resin film is fed from the first payout machine, and then the other base material 14 is paid out from the second payout machine. T-die extruder 1
5, the thermoplastic synthetic resin 16 is extruded, and the press roll 1
7 and the cooling roll 18 are bonded to each other so as to be laminated and integrated, and the obtained laminated material 19 is wound up by a winding machine 20. As shown in FIG. 7, the laminated material obtained as described above is a laminate of the base material 13a and the film 13b through the thermoplastic resin 16 only in the silicone non-application portion without being adhered in the silicone application portion 21. It is a laminated material in which 13 and the base material 14 are partially bonded. However, a thermoplastic resin film (without a base material) may be directly laminated on the surface of the partially coated thermoplastic resin film.

As the base material, in addition to paper, synthetic resin film, metal foil, woven cloth, non-woven cloth and the like can be used. The thermoplastic resin is preferably a polyolefin resin such as polyethylene or polypropylene, an extrudable resin such as polyethylene terephthalate resin or polyamide resin,
These are used alone or in combination of two or more.

[0013]

The present invention will be described in more detail based on the following examples, but the invention is not intended to be limited thereto.

Example 1 Low density polyethylene "Mirason-16sp" (manufactured by Mitsui Petrochemical Co., Ltd.) on a kraft paper (basis weight 73 g / m ² ) as a base material by a conventional method using a T-die extruder. To T
Extrusion lamination was performed at a die temperature of 330 ° C (resin thickness 18
μm). Then, a mixture liquid (viscosity 850 cps) in which the solventless silicone resins “KNS-230A” and “KNS-230B” (both manufactured by Shin-Etsu Chemical Co., Ltd.) were mixed immediately before on the same line, was added to the laminate to reduce the viscosity. The surface of the density polyethylene was coated using an offset gravure roll coater (processing speed 180 m / min).
The coater roll had the structure shown in FIG. 1, and the rubber coater roll used had the pattern shown in FIG. The silicone liquid was transferred from the gravure roll to the convex portions of the coater roll, and the silicone liquid of the convex portions was further transferred onto the laminated polyethylene surface to obtain a partially silicone-coated polyethylene-treated paper. At this time, the coating amount of the partial silicone layer was 1.
At 5 g / m ² , the desired partial coating process could be performed without losing the shape.

Example 2 Using the apparatus shown in FIG. 6, the polyethylene-coated paper having the partial silicone coating obtained in Example 1 was fed as a substrate from the first feeding machine, and on the other hand from the second feeding machine. The base material (kraft paper: basis weight 73 g / m ² ) is fed out,
Between the two, the same resin as used in Example 1 was used with a T-die extruder at a T-die temperature of 330 ° C. and a processing speed of 160 m / min.
Then, the resin was extruded with a thickness of 18 μm (so-called poly sandwich laminate), and both were bonded and integrated. The obtained laminate had a strong impact resistance, a high tear strength, and a soft texture because the partially silicone-coated portion was non-adhesive. When a bag for resin was made using this, a bag having excellent bag breaking strength and tear strength and a good feeling was obtained.

COMPARATIVE EXAMPLE A base material (kraft paper: basis weight 73 g / m ² ) and a base material (the same as the above) were prepared in the same manner as in Example 2 except that the silicone coating was not applied, with a thickness of 36 μm “Mirason-16sp”. A poly sandwich was laminated to obtain a laminate. As a result of bag making using this, only a bag having inferior breaking strength, tear strength and feeling as compared with the bag of Example 2 was obtained.

[0017]

As described above, according to the present invention, it is possible to provide a laminated material which can be partially coated with silicone and which is partially adhesively laminated by using the method and is excellent in tear strength and feeling. .

[Brief description of drawings]

FIG. 1 is a schematic diagram of an offset gravure roll method.

FIG. 2 is a perspective view showing an example of a convex pattern provided on the surface of a coater roll.

FIG. 3 is a perspective view showing an example of a convex pattern provided on the surface of a coater roll.

FIG. 4 is a perspective view showing an example of a convex pattern provided on the surface of a coater roll.

FIG. 5 is a perspective view showing an example of a convex pattern provided on the surface of a coater roll.

FIG. 6 is a schematic view of a poly sandwich laminate system.

FIG. 7 is a schematic cross-sectional view showing an example of a laminated material obtained by the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Press roll 2 Coater roll 3 Gravure roll 4, 5 Metering roll 6 Partial coating object 7 Circular convex part 8, 9 Streak convex part 10, 11 Groove 12 Rectangular convex part 13 Laminate 13a Base material 13b Thermoplastic resin Film 14 Base material 15 T-die extruder 16 Thermoplastic synthetic resin 17 Press roll 18 Cooling roll 19 Laminating material 20 Winder

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Claims (3)

(57) [Claims] 1. A partial coating method for silicone, which comprises coating a solventless silicone liquid with a coater roll having a convex portion by an offset gravure roll method. 2. The partial coating method according to claim 1, wherein the surface of the thermoplastic resin film laminated on the substrate is coated. 3. A solventless silicone liquid is partially coated on a surface of a thermoplastic resin film laminated on a substrate by using a coater roll having a convex portion by an offset gravure roll method, and then a partial coating of the laminate. A method for producing a laminated material, characterized in that a thermoplastic resin is extruded and laminated between a thermoplastic resin film having been subjected to the above and another substrate.