JP2867143B2 - Resin lamination method for cards - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing a driver's license, an ID card, and other cards, by performing resin lamination for surface protection.

[Conventional technology]

In a driver's license, an ID card, and the like, a laminate of a transparent plastic film for protecting the printing surface is known. In the production, the raw material of the card was punched out to a predetermined size, this card was inserted between laminates having one end edge fixed to each other, laminated, and then laminated by thermocompression bonding.

[Problems to be solved by the invention]

However, as mentioned above, when manufacturing cards,
The number of manufacturing steps increases, and the manufacturing cost increases. In addition, there is a problem that air bubbles are mixed into the lamination surface during lamination.

Therefore, the present inventors applied a resin, particularly an ultraviolet curable resin, directly to the surface of a card previously cut to a predetermined size, and then irradiated and cured the applied surface with ultraviolet rays to form a protective layer, thereby reducing the manufacturing cost. It was found to be advantageous in such points.

In this case, the protective layer needs to be thick to some extent, and as long as a rubber roll is used, it is difficult to obtain a thick coating film thickness. Therefore, it has been found that it is preferable to use a gravure roll instead of the rubber roll.

However, when performing thick film coating using a gravure roll, due to the filling property of the coating liquid into the gravure roll cell and the transferability of the gravure roll cell liquid to the card base material,
Coating failures such as streaks and pinholes are likely to occur. Moreover,
Even if thick film coating can be performed, it is difficult to obtain a uniform film thickness.

Therefore, a main object of the present invention is to provide a resin laminating method that can advantageously suppress coating failure.

[Means for solving the problem]

The present invention that has solved the above-mentioned problem is a method of applying an ultraviolet curable resin liquid to the surface of a single-sheet card in a process of passing the card between a pair of rolls facing each other. And a resin laminating method for cards.

(A) One of the rolls is a metal gravure roll that receives an ultraviolet ray curable resin liquid and applies it to the card surface, and the surface temperature of the gravure roll is adjusted to 30 to 30 by a temperature control means.
While adjusting the temperature to 60 ° C., the UV curable resin
A step of coating the card with a film thickness of μm.

(B) After that, the card coated with the ultraviolet curable resin liquid is irradiated with ultraviolet light by an ultraviolet light irradiator on the application surface,
A step of curing the ultraviolet curing resin.

[Action]

According to the present invention, a temperature adjusting means is attached to the metal gravure roll, and the surface temperature of the gravure roll is adjusted to 30 to 60 ° C. by the temperature adjusting means to adjust the viscosity of the ultraviolet curable resin coating solution, , The gravure roll cell is filled with the coating liquid well,
The irregularities transferred to the card are quickly leveled (smoothed) before being cured thereafter, thereby reliably preventing streak failure and pinhole failure. Further, in order to fill (enter) the cell of the gravure roll with the UV-curable resin coating liquid well, the UV-irradiating device is then irradiated with UV light by an ultraviolet irradiation device, so that the stripes having a large thickness are formed. There is no failure and no pinhole failure, and the surface temperature of the gravure roll is adjusted during coating, so that a card having a uniform film thickness can be obtained.

〔Example〕

Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings.

First, an example of an apparatus for carrying out the method of the present invention will be described with reference to FIG. 1, and then a gravure roll temperature adjusting means will be described.

FIG. 1 is an overall front view of the apparatus, in which each device or member shown is housed in one housing 1. FIG. A base plate 2 having a flow-down hole 2a is provided at an upper portion of the housing 1, and uncoated cards 3 made of a plastic sheet such as PET as a base material are arranged, for example, vertically.
From the aligned group, each sheet is sequentially moved vertically to the position of the flow-down hole 2a, and flows down from the flow-down hole 2a.
As shown in detail in FIG. 2, a guide distribution member 4 having an H-shaped cross section is disposed below the flow-down hole 2a.

By rotating the pivot 4A forward or backward by a cylinder (not shown), for example, the guide sorting body 4 is oriented in the direction of the solid line in FIG. 1 for a normal card, and is oriented in the direction of the imaginary line in the figure for an abnormal card. It has become. The card 3 that has fallen from the downflow hole 2a is guided along the web portion 4B of the guide sorting body 4.

A guide plate 5 is arranged below the guide distribution body 4 as necessary. Furthermore, a pair of push rollers 6A and 6B made of rubber or the like are provided to face each other below. At least one, and preferably both, of the pushing rolls 6A and 6B are used as driving rolls.

Below the press rolls 6A and 6B, a coating device 7 for an ultraviolet curable resin liquid as a resin for lamination is provided. The coating apparatus 7 scrapes the coating liquid of the coating liquid vat 70 of the ultraviolet curing resin for lamination, the pickup roll 71 of the coating liquid, the metal gravure roll 72 in contact therewith, the back roll 73 opposed thereto, and the gravure roll 72. It includes a doctor blade 74 for dropping, a coating liquid tank 75, a supply pump 76 for supplying the coating liquid to the vat 70 therefrom, and a recovery liquid tank 77 for recovering the overflow liquid from the vat 70.

The card 30 coated with the ultraviolet curing resin for lamination for forming the protective layer 31 on one surface by the coating device 7.
Is a conveyor 8 horizontally disposed below the coating device 7.
It is conveyed to the left in FIG. 1 with the coating surface up. An ultraviolet irradiation device 9 having one or a plurality of ultraviolet lamps 9A is installed above the conveyor 8 so as to irradiate ultraviolet light on the surface of the card 30 coated with the ultraviolet curing resin.

On the exit side of the conveyor 8 is a stocker 10 for the final product.
Is provided. Reference numeral 11 denotes a scraping plate that scrapes off excess ultraviolet curable resin for lamination at the tail end of the card 30 provided as necessary.

In the laminating equipment thus configured, the uncoated card 3 flows down from the flow-down hole 2a, is guided between the pushing rolls 6A and 6B by the guide distribution body 4, and is bitten therein. Next, by pushing rolls 6A and 6B,
The card 3 is guided between the gravure roll 72 and the back roll 73. Here, the nip position of the pushing rolls 6A and 6B,
Since the distance between the nip positions of the gravure roll 72 and the back roll 73 is preferably set to be shorter than the length of the card 3 in advance, the pushing force of the pushing rolls 6A and 6B causes
Card 3 is gravure roll 72, back roll
Supplied between 73.

In the coating device 7, after the coating, the transfer is transferred from the pickup roll 71 to the metal gravure roll 72, and the ultraviolet curable resin for lamination is coated on one surface of the card 3. The coated card 30 is transported by the transport conveyor 8, and in the process, is irradiated with ultraviolet rays from the ultraviolet irradiating device 9 to cure the ultraviolet curing resin for lamination. The card 30 having been cured with the ultraviolet curable resin for lamination is temporarily stored in the stocker 10.

Now, in the present invention, the metal gravure roll
72 is provided with a temperature control means. As the temperature adjusting means, for example, as shown in FIGS. 3 and 4, a means in which the infrared lamp 20 is disposed in the internal space of the gravure roll 72 and the lighting time thereof is adjusted can be used. More specifically, the infrared lamp 20 is connected to a power supply 21, an on / off switch 22 is provided therebetween, and a temperature detector 23 is disposed at an appropriate position of the gravure roll 72, for example, on the surface of the shaft portion. The temperature controller 24 operates the on / off switch 22 based on the temperature signal from the controller to control the lighting time of the infrared lamp 20. Thereby, the surface temperature of the gravure roll 72 is controlled, and as a result, the temperature and the viscosity of the ultraviolet curable resin liquid transferred from the pickup roll 71 can be adjusted.

As the temperature adjusting means attached to the metal gravure roll 72, a hot wire heater may be embedded in the gravure roll 72 to control the amount of power supplied thereto. Further, the temperature may be adjusted by flowing a heat medium into the gravure roll 72.

Further, together with the temperature adjusting means provided on the metal gravure roll 72, a similar temperature adjusting means may be provided on the pickup roll 71 and / or the back roll 73. In addition, as shown in FIG. 3, the coating liquid vat 70 may be provided with a jacket 25 and hot water 26 may be passed through the jacket 25 to control the temperature of the coating liquid.

In any case, as described above, when obtaining the ID card, when forming the protective layer 31 with an ultraviolet curable resin, the surface temperature of the gravure roll 72 is particularly 30 in terms of viscosity controllability of the coating liquid. ~ 60 ° C is preferred. In addition, the viscosity of the UV-cured resin thus controlled in viscosity is 200 CPS, preferably 100 CPS, particularly 60 CPS.
The following is good.

In the above example, the reason why the metal gravure roll 72 is selected is that it is effective when the laminate film thickness is large. By the way, in the present invention example, as the laminate film thickness,
Particularly, the thickness is preferably from 10 to 100 μm. However, a smooth rubber roll has a maximum thickness of 5 μm. As the back roll, a metal roll is preferable.

The rotation direction of the pickup roll 71 is set to the solid line direction when the coating liquid hardly foams, and is set to the virtual line direction when the coating liquid easily foams.

As the ultraviolet curable resin used in the present invention, all known ones can be used.

The ultraviolet curable resin basically contains a photopolymerizable prepolymer, a photopolymerizable monomer, and a photopolymerization initiator. If necessary, sensitizers, pigments, fillers, inert organic polymers, leveling agents, thixotropic agents, thermal polymerization inhibitors,
A solvent or the like is added.

(Example) When the temperature dependence of the viscosity of the ultraviolet curable resin used in the present invention was examined, the result shown in FIG. 5 was obtained.

In addition, using the above-mentioned laminating equipment, the applicability of the ultraviolet curable resin (streak failure, bubble failure), the filling property of the coating liquid into the gravure roll cell, and the stability of the coating liquid were investigated. 9 were obtained.

From these results, it is important to adjust the viscosity of the coating solution by adjusting the surface temperature of the gravure roll, and it has been found that a gravure roll surface temperature of 30 to 60 ° C. is good.

〔The invention's effect〕

As described above, according to the present invention, it is possible to reliably apply a thick film with a uniform thickness without application failure.

[Brief description of the drawings]

FIG. 1 is a schematic view of an example of an apparatus used for carrying out the present invention, FIG. 2 is a perspective view of a guide distributing body, FIG. 3 is an enlarged view of an example of an application apparatus, FIG. FIG. 5 is a graph showing the temperature dependence of the viscosity of the ultraviolet curable resin, and FIGS. 6 to 9 are graphs showing the results of the examples. 2a… Downflow hole, 3… Card, 4… Guide sorting body 6
A, 6B: Press roll 7: Coating device, 8: Conveyor, 9: UV irradiation device, 10: Stocker 20: Infrared lamp, 22: On / off switch, 23 ...
Temperature detector 24 Temperature controller 71 Pickup roll
72… gravure roll 73… back roll

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B05D 3/06 B05D 3/00 B05D 7/04 B05D 1/28 B05C 1/02 102

Claims (1)

(57) [Claims] 1. A method of applying an ultraviolet-curable resin liquid to the surface of a single-sheet card in a process of passing the single-sheet card between a pair of opposed rolls, the method comprising the following continuous steps. Method for laminating cards. (A) One of the rolls is a metal gravure roll that receives an ultraviolet ray curable resin liquid and applies it to the card surface, and the surface temperature of the gravure roll is adjusted to 30 to 30 by a temperature control means.
While adjusting the temperature to 60 ° C., the UV curable resin
A step of coating the card with a film thickness of μm. (B) After that, the card coated with the ultraviolet curable resin liquid is irradiated with ultraviolet light by an ultraviolet light irradiator on the application surface,
A step of curing the ultraviolet curing resin.