JPH05220847A - Method for gravure coating and preparation of synthetic resin laminated film using its coating method - Google Patents

Abstract

PURPOSE:To provide a gravure coating method which can prevent surely an adhesive from adhering on both side edge parts of a synthetic resin film in a method wherein both side edges of the ultrathin synthetic resin film are coated with the adhesive by means of a gravure roll with a wider width than the width of the film while non-coated parts of a specified width remains on both side edges. CONSTITUTION:A synthetic resin film A is carried by means of a backup roll 2 having a coating width for an adhesive C and placed by facing to a gravure roll 1 and a film-like protective member 5 having a higher rigidity than that of this synthetic resin film A and a specified width is stretched in the carrying direction of the synthetic resin film A at a position corresponding to the non- coating part of the synthetic resin film A on the gravure roll 1 not to coat both side edge parts of the synthetic resin film A with an adhesive C on the gravure fall 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention is mainly applied to apply an external drug (transdermal drug) for anti-inflammatory or analgesia.
In the process of producing a synthetic resin laminated film generally called a raw material for plaster, a method of applying an adhesive for laminating films by a gravure roll, and the synthetic resin laminated film using the same application method. The present invention relates to a manufacturing method.

[0002]

2. Description of the Related Art In general, the above-mentioned raw material for plaster is
A vinyl chloride resin (PVC) film is used because it is inexpensive, but in order to prevent the plasticizer contained in the vinyl chloride resin from migrating to the external drug when the external drug is applied to the plaster stock, An ultrathin barrier film is laminated on a vinyl chloride resin film, and an external drug is applied to the barrier film. Polyethylene terephthalate (PET) is generally used for this barrier film.

By the way, when a PET film is laminated and laminated on a PVC film, the width of the PET film is made slightly wider than that of the PVC film. Then, after applying an adhesive on the PET film while leaving non-coated portions of a constant width on both side edges, a PVC film is laminated.

Conventionally, when applying an adhesive to a PET film or the like, a so-called gravure coating method using a gravure roll has been used. As shown in FIG. 3, this coating method includes a backup roll 2 for transporting a film A to be coated and a gravure roll 1 for coating an adhesive C.
Are arranged to face each other, and the backup roll 2 is rotated by rotating the gravure roll 1 while supplying the adhesive C to the surface of the gravure roll 1 via the doctor knife 4.
And the film A is conveyed through the space between the gravure roll 1 and the backup roll 2 and the adhesive C is applied to the central portion of the film A.

[0005]

However, the above-mentioned conventional gravure coating method has room for improvement in the following points.

That is, since the gravure roll 1 is very expensive and it takes time to replace it, a ready-made roll having a wider width than the film A to be coated is used. On the other hand, a rubber roll is usually used as the backup roll 2, and since it is inexpensive and easy to replace, the backup roll 2 having a width set according to the coating width of the adhesive on the film A is used. Therefore, by rotating the gravure roll 1 and transporting the film A between the gravure roll 1 and the backup roll 2, the adhesive C on the surface of the gravure roll 1 is, in principle, pressed against the gravure roll 1. The film A is coated according to the width of the backup roll 2.
However, when the film A is extremely thin (for example, 3.5 μm), since the both side edges of the film A sway up and down like waves, the adhesive C on the surface of the gravure roll 1 is as shown in FIG. , Are attached to both side edges of the film A with a space in the longitudinal direction.

When the adhesive C'is attached to the side edges of the film A in this manner, another film having a slightly narrow width as described above is laminated and taken up by the take-up roll. Both edges of the upper and lower films are adhesive C '
Glued in. Therefore, for example, when the film wound on the winding roll is rewound in order to apply an external medicine, the film is torn at the bonding points on both side edge portions of the film or a crack is formed at the bonding points. In addition, since the adhesive spots on both side edges of the film are raised in a state where the film is wound around the winding roll, the appearance is also poor.

The present invention has been made in view of the above-mentioned point, and an uncoated portion having a constant width is left on both side edges of a film on an ultrathin synthetic resin film by a gravure roll wider than the film width. Provide a gravure coating method that can reliably prevent the adhesive from adhering to both side edges of the film when applying the adhesive, and also use it for plaster stock etc. using the same coating method It is an object of the present invention to provide a method for producing a laminated film of synthetic resin as described above.

[0009]

In order to achieve the above-mentioned object, the gravure coating method of the present invention is arranged such that a synthetic resin film has a coating width of the adhesive and faces a gravure roll. While carrying by a backup roll, on the gravure roll, at a position corresponding to a non-coated portion of the synthetic resin film, a film-shaped protective member having a predetermined width with higher rigidity than the synthetic resin film, the synthetic resin film. Is stretched in the conveying direction to prevent the adhesive on the gravure roll from being coated on the non-coated portion of the synthetic resin film.

Further, in the method for producing a synthetic resin laminated film according to the present invention, an adhesive is applied onto an ultrathin synthetic resin film by the gravure coating method according to claim 1, and then another synthetic resin film is applied. It is made to be dry-laminated on an ultrathin synthetic resin film.

[0011]

According to the gravure coating method of the present invention having the above-mentioned structure, the gravure having a width wider than the film width is left on the ultrathin synthetic resin film, leaving the non-coated portions having constant widths on both side edges. When applying the adhesive by a roll, the gravure roll surface side of both side edges of the film protruding to both sides from the backup roll, the film-shaped protective member stretched on the gravure roll is contacted and conveyed, The adhesive on the surface of the gravure roll is prevented from adhering to both side edges of the film. As a result, the adhesive is applied to the central portion of the film, leaving a non-coated portion having a constant width on both side edges.

Further, according to the method for producing a synthetic resin laminated film of the present invention having the above-mentioned constitution, another synthetic resin having a slightly narrow width is formed on the adhesive applied to the central portion of the ultrathin synthetic resin film. The film is laminated, and the non-adhesive non-coated portion of a certain width is surely left on both side edges of the ultrathin synthetic resin film. Therefore, even when the laminated synthetic resin laminated film is wound on a winding roll, both side edges of the ultrathin synthetic resin film are not adhered with an adhesive, therefore, when rewound, It is surely prevented that both side edges of the synthetic resin film are torn or cracked as in the conventional case.

[0013]

EXAMPLES Hereinafter, a gravure coating method of the present invention and a method for producing a synthetic resin laminated film using the coating method will be described based on Examples with reference to the drawings.

FIG. 1 is a perspective view showing a gravure coating method of the present invention. As shown in the figure, a motor (not shown)
A rubber roll 2 serving as a backup roll for transporting a film is rotatably disposed so as to face upward with the gravure roll 1 rotationally driven by the lower side facing downward. The gravure roll 1 is a ready-made product, and its width is usually wider than the width of the ultrathin synthetic resin film A on which the adhesive C is to be applied. On the other hand, the width of the rubber roll 2 is set according to the coating width of the adhesive C applied on the film A, and is slightly narrower than the width of the film A.

The film A is conveyed by a rubber roll 2 which rotates in accordance with the rotation of the gravure roll 1. The rubber roll 2 is pressed against the gravure roll 1, and the adhesive C is applied from the surface of the gravure roll 1 when the film A is conveyed in contact with the surface of the gravure roll 1. At the time of this coating, the following measures are taken so that the adhesive C does not adhere to both side edges of the film A.

That is, along the both side edges of the film A protruding outward from both sides of the rubber roll 2, a film-shaped protective member 5 having a predetermined width and a predetermined length, which has a rigidity higher than that of the film A, is provided in the conveying direction. It is stretched across the surface of the gravure roll 1. The material of the protective member 5 is not particularly limited, but when the adhesive C contains a solvent, a material (for example, PET) that does not swell with the solvent is used. The front and rear end portions of the protective member 5 are respectively fixed to support members (not shown) and stretched in opposite directions (arrow directions in FIG. 1) to be held in a tensioned state. Further, the protective members 5 on both sides may be arranged parallel to the lower surface of the film A as shown in FIG. 1, or the outer edge side of each protective member 5 may be inclined slightly upward.

By rotating the gravure roll 1 in the counterclockwise direction in FIG. 1, the rubber roll 2 rotates in the clockwise direction and the film A is conveyed. At a position where the film A contacts the surface of the gravure roll 1 (between the rubber roll 2), the adhesive C having the same width as the rubber roll 2 is applied onto the film A. At this time, the both side edges of the film A are fed so as to slide on the protective member 5, and the contact with the surface of the gravure roll 1 is reliably prevented. The gravure roll 1 is arranged in a container 3 (see FIG. 2) having an open upper end in which the adhesive C is stored, and the adhesive C in the container 3 is supplied to the surface thereof via a doctor knife 4. ..

FIG. 2 is a process drawing showing an embodiment of a method for producing a synthetic resin laminated film. As shown in the figure, the ultrathin synthetic resin film A fed from the feeding roll 10
In accordance with the above-mentioned coating method, the adhesive C is coated so that the non-coated portions having a constant width are left on both side edges thereof (coating step). After this coating step, the film A is sent into the drying furnace 11, where the solvent contained in the adhesive C coated on the film A is evaporated, and the adhesive C is heated (drying step). ). The temperature in the drying furnace 11 is usually 9
It is set to 0 to 110 ° C.

Another synthetic resin film B fed from the feeding roll 9 is laminated on the adhesive C layer of the film A fed by the large-diameter feed roll 12 by the pressure-bonding roll 13 (dry lamination step). .. The film B has the same width as the adhesive C layer of the film A, and the thickness thereof is thicker than that of the film A. The laminated films A and B are heated by the heating roll 14 (heating step), and then the rubber roll 15 and the embossing roll 1
It is embossed between 6 (embossing process). After that, the films A and B are cooled by the cooling rolls 17 and 18 (cooling step), and then wound on the winding roll 19.

In this way, the film A and the film B are
And two synthetic resin films A and B are manufactured.

Examples Application: Film for external patch (plaster) (stock) Film A: PET with a thickness of 3.5 μm and width of 450 mm Film B: PVC with a thickness of 75 μm and width of 440 mm C Adhesive C: urethane type ( 60% ethyl acetate as solvent) Gravure roll 1: 95 mesh, width 500 mm, diameter 200 mm Rubber roll 2: width 420 mm, diameter 150 mm Protective member 5: thickness 35 μm, width 30 mm, length 300 m
PET of m After winding the plaster material according to this embodiment manufactured as described above on the winding roll 19 (FIG. 2),
It was rewound after a long time (about one month), but at the time of rewinding, both side edges are torn or cracked like the plaster stock manufactured by the conventional gravure coating method. Such a problem did not occur. In the above examples, the case of manufacturing a plaster stock was described as an example, but the gravure coating method of the present invention can be applied to, for example, coating a primer in addition to coating an adhesive. Needless to say.

[0022]

As is clear from the above description,
The gravure coating method of the present invention and the method for producing a synthetic resin laminated film using the same coating method have the following effects.

(1) According to the gravure coating method of the present invention,
When applying an adhesive on an ultra-thin synthetic resin film with a gravure roll wider than the film width leaving an uncoated part on both edges with a constant width, the adhesive will be applied to both edge parts of the film. It can be surely prevented from adhering. Further, since the film-shaped protective member is simply stretched at a predetermined position on the gravure roll, the cost is almost the same as that of the conventional coating method.

(2) According to the gravure coating method of the present invention,
Even if the laminated synthetic resin laminated film is wound up on a winding roll, the edges of both sides of the ultrathin synthetic resin film are not adhered to each other with an adhesive, so when rewinding, the synthetic resin film It is possible to reliably prevent the edges of both sides from being torn or cracked. This produces a high quality laminated film.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a gravure coating method of the present invention.

FIG. 2 is a process drawing showing an example of a method for producing a synthetic resin laminated film.

FIG. 3 is a perspective view showing a conventional general gravure coating method.

[Explanation of symbols]

 1 Gravure Roll 2 Rubber Roll (Backup Roll) 3 Container 4 Doctor Knife 5 Film Protective Member A, B Film C Adhesive

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B32B 27/08 7258-4F 31/12 7141-4F // B29L 9:00 4F

Claims (2)

[Claims] 1. A method of coating an adhesive on a very thin synthetic resin film by leaving a non-coated portion having a constant width on both side edges of the film and applying the adhesive with a gravure roll wider than the film width. A resin film is conveyed by a backup roll having a coating width of the adhesive and arranged to face the gravure roll, and on the gravure roll, a position corresponding to a non-coated portion of the synthetic resin film. In, a film-like protective member having a predetermined width having a higher rigidity than the synthetic resin film is stretched in the transport direction of the synthetic resin film, and the adhesive on the gravure roll is applied to the non-coated portion of the synthetic resin film. A gravure coating method characterized in that it is not coated. 2. An adhesive is applied onto another synthetic resin film, which is slightly narrower and thicker than the film, while leaving a non-laminated portion having a constant width on both side edges of the ultrathin synthetic resin film. A method for producing a synthetic resin laminated film by working and then laminating, wherein an adhesive is applied on the ultrathin synthetic resin film by the gravure coating method according to claim 1, and then the another synthetic resin is applied. The method for producing a synthetic resin laminated film using the gravure coating method according to claim 1, wherein the film is dry laminated on the ultrathin synthetic resin film.