JPS63176135A - Laminate processing method - Google Patents

Abstract

PURPOSE:To obtain a glossy product without forcing out a resinous solution which is applied comparatively in great quantities, by a method wherein a ultraviolet curing resinous solution is applied comparatively in great quantities, the coated material is passed through a first irradiation part of ultraviolet rays, and after the same has been turned into a semi-dried state, the same is passed through between press contacting rollers while attaching a base material or a clad material and then passed again through a second irradiation part of the ultraviolet rays. CONSTITUTION:A first irradiation part 6 is arranged on the inside between an application roll 2 and pressure roll 4, and a long-sized clad material 8 is sent into a space between the pressure roll 4 and a heating roll 5 while applying a resinous solution to the inside by passing the clad material 8 between the application roll 2 and a back-up roll 3. In the meantime, the resinous solution is made into a semi-dried state by irradiation ultraviolet rays to the surface of the resinous solution through the first irradiation part 6. On one hand, a long-sized base material 9 is sent into between the pressure roll 4 and heating roll 5 while the same is being led by a guide roll 10. The resinous solution which has been interposed between the clad material 8 and base material 9 and is in the semi-dried state is passed through between the pressure roll 4 and heating roll 5 while the resinous solution is being contacted with pressure. Then the same is led by a guide roll 11, passes through a second irradiation part 7, the resinous solution is cured completely, the clad material 8 is stuck onto the base material 9 and laminate processing is performed.

Description

Detailed Description of the Invention (Industrial Application Field) This invention is a lamination process in which an ultraviolet curable resin liquid is passed between pressure rolls and an ultraviolet irradiation part while being interposed between an adherend and a base material. Concerning improvements in law.

(Prior Art) Conventionally, the laminating method involves applying a solution of thermoplastic resin to a base material, drying it to remove the solvent, and then
There is a dry laminating method in which a solution of thermoplastic or thermosetting resin is applied to a base material and then passed between rolls to be crimped, and then the resin liquid is set. There is a wet lamination method in which the material is passed through a setting device.

Among these laminating methods, the tri-laminate method removes the solvent by drying, so there is a problem of environmental pollution due to solvent vapor, and the process using a heating dryer and heated rolls may damage the material or shape of the base material. In addition, the evaporation of the solvent dries the resin liquid applied to the base material and causes it to lose its fluidity, resulting in poor compatibility with the adherend during pressure bonding between rolls, resulting in small bubble-like unbonded areas. Inconveniences occur, such as a decrease in quality, that is, the quality is affected by the quality of the coating. Furthermore, in the dry laminating method, in order to increase the processing speed, it is necessary to expand the drying equipment, which has the disadvantage that the equipment and operating ratio become expensive.

On the other hand, in the wet lamination method, after processing the coating material, it is necessary to pass the bonded product pressed between rolls through a setting device for a long time to harden the resin liquid. For this reason, there is a risk that the bonded product will swell with the coating agent and lose its material or shape, and the quality of the processed product that has passed through the setting device will change due to changes over time.

In this way, in the wet lamination method, the products cannot be moved immediately after bonding and must be left for a while, but this requires a large storage space in which to leave the processed products.

In contrast, the inventor of the present application has developed a method of laminating which has the characteristics of dry laminating and wet laminating, and which does not have the drawbacks of these conventional methods. He proposed a method in which the resin liquid was passed between pressure rolls with the resin liquid interposed in the resin, and the resin liquid was further irradiated with ultraviolet rays to quickly harden the resin liquid for lamination processing (Japanese Patent Publication No. 57-23590).

(Problem to be solved by the invention) However, in this method, the resin liquid is interposed between the adherend and the base material, and after passing between pressure rolls, the resin liquid is passed through an ultraviolet irradiation section. Since it is cured, there are drawbacks such as a lack of luster in the finished product, such as uneven or porous substrates.

In addition, in order to give gloss to the finished product, if a large amount of resin is interposed between the adherend and the base material and the resin is passed between the pressure rolls, the pressure force of the rolls will cause the resin liquid to spread between the adherend and the base material. This may cause inconveniences such as protruding from the space.

(Means for Solving the Problems) As a result of intensive research in view of the above circumstances, this invention is an improvement of the above-mentioned laminating method previously proposed by the inventor of the present invention. After applying a relatively large amount of ultraviolet curable resin liquid and passing the ultraviolet rays through the first irradiation part to make the resin liquid semi-dry, attaching a base material or an adherend to the surface to which the resin liquid has been applied. The present invention proposes a method for adhering and hardening the resin liquid onto Omurakami by passing it between pressure rollers while causing the resin liquid to pass through the second ultraviolet ray irradiation section again.

As the ultraviolet curable resin liquid used in this invention, a normal ultraviolet curable resin liquid may be used, and it may contain at least one type of monomer or prepolymer having a radically polymerizable unsaturated double bond and a sensitizer as essential components. In addition, various additives such as other resins, colorants, and waxes are blended as necessary.

Examples of heptamers having radically polymerizable unsaturated double bonds include esterification of (meth)acrylic acid with alcohols such as ethylene glycol, polyethylene glycol, trimethylolpro, pan, and pentaerythritol, phthalic acid, and maleic acid. Examples include those obtained by esterifying allyl alcohol with acids, isocyanuric acid, etc., or those obtained by esterifying glycidyl (meth)acrylate. Prepolymers include epoxy resins esterified with (meth)acrylic acid, hydroxyl group-containing resins esterified with (meth)acrylic acid, alkyds containing water groups, polyester resins, or acrylic resins. Examples include those in which an acrylic acid-polyol ester is crosslinked with a diisocyanate.

Sensitizers used in this invention include benzoin-based sensitizers such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isobutyl ether, 2-allylbenzoin, and 2-chlorobenzoin, benzophenone, p-methylbenzoinphenone, p
-Ketone sensitizers such as chlorobenzophenone, Michler's ketone, acetophenone, azo sensitizers such as azobisisobutyronitrile, quinone sensitizers such as anthraquinone, 2-chloroanthraquinone, phenanthrene, tetramethylthiuram monosulfate Sulfide sensitizers such as phyto-based sensitizers and combinations of various sensitizers are used.

The amount of this sensitizer is generally 0.1 to 2.5% by weight in the resin composition.

In addition, in this invention, paper, plastic, metal, wood, and other composite materials thereof can be used as the base material, and when irradiating ultraviolet rays as the adherend, ultraviolet-transparent materials such as polyester and polypropylene can be used as the adherend. Various plastics such as , acrylic resin, polycarbonate, polyamide, polyvinyl chloride, polyvinylidene chloride, phenol resin, polystyrene, polyfluoroethylene, and cellophane are used.

For ultraviolet irradiation, ordinary mercury lamps and metal halide lamps with high pressure, medium pressure, or low pressure are used, and the type, size, number, etc. of the lamps are determined depending on the curing speed of the ultraviolet curable resin, etc.

Furthermore, in order to improve the fluidity of the ultraviolet curable resin interposed between the base material and the adherend, one or both of the pressure rolls is preferably a heated roll, and the size, quantity, etc. of the pressure rolls are determined. is appropriately selected depending on the type of adherend, base material, and ultraviolet curable resin.

The amount of the above-mentioned ultraviolet curable resin liquid applied to the adherend or base material is generally about 3 g/m'', but in this invention, if the surface of the adherend or base material is uneven, the amount applied is 4 to 4 g/m. 15g/l
The resin liquid is applied in a relatively large amount of about l+2, generally about 4 to 5 g/l112, and then passed through a first irradiation section of ultraviolet rays to bring the resin liquid into a semi-dry state. That is, as described above, the resin liquid applied in a relatively large amount is kept in a semi-dry state to the extent that it does not protrude from between the adherend and the base material when it passes between the next pressure rolls. Therefore, the output of the first irradiation section is about 172 to 1/3 of the output of the second irradiation section.

Next, while adhering the base material or adherend to the semi-dry resin liquid application surface as described above, the resin liquid is passed between the pressure rollers and through the second irradiation section of ultraviolet rays to apply the resin liquid onto the base material. The adhesive is cured to complete the lamination process.

1 and 2 show embodiments of the present invention, of which FIG. 1 shows a case where an adherend is applied and passed through a roll ring.

In this case, the apparatus includes a container 1 for the ultraviolet curable resin liquid, a coating roll 2 for applying the resin liquid to the inner surface of the adherend, a backup roll 3, and a roller for press-bonding the adherend and the base material. It consists of a pressure roll 4, a heating roll 5, a first irradiation section 6 and a second irradiation section 7 for ultraviolet rays.

The first irradiation unit 6 is arranged inside between the coating roll 2 and the pressure roll 4, and the long adherend material 8 is passed between the coating roll 2 and the backup roll 3, and the resin liquid is applied to the inner surface thereof. While being fed between the pressure roll 4 and the heating roll 5 while being coated, the resin liquid surface is irradiated with ultraviolet rays from the first irradiation unit 6 to bring the resin liquid into a semi-dry state. On the other hand, a long base material 9 is fed between the pressure roll 4 and the heating roll 5 while being guided by the guide roll IO. Therefore, the semi-dry resin liquid interposed between the adherend 8 and the base material 9 passes between the pressure roll 4 and the heating roll 5 while being pressed together. next,
The resin liquid is guided by the guide roll 11 and passes through the second irradiation section 7, where the resin liquid is completely cured, and the adherend 8 is adhered onto the base material 9, and lamination processing is performed.

FIG. 2 shows a case where a resin is applied to the inside of the base material and the resin is passed between rolls. In this case, the first irradiation section 6 is arranged above the path of the base material 9 in front of the pressure roll 4, and the inner surface of the base material 9 is coated with resin liquid in advance, and the first irradiation section 6 is placed on the belt conveyor 11. After the resin liquid is made semi-dry, it is fed between the pressure roll 4 and the heating roll 5, where it is pressed against the adherend 8. Next, the crimped product is placed on the belt conveyor 13 and passed through the second irradiation section 6, where the resin liquid is completely cured by ultraviolet irradiation and laminated.

In this embodiment, an example in which the second irradiation section 7 is provided behind the pressure roll 4 and the heating roll 5 has been described, but the pressure roll 4. The heating roll 5 may be made of a material that transmits ultraviolet rays, and the second irradiation section 7 may be incorporated therein (see FIGS. 4 and 5).

In this case, the adherend 8 and the base material 9 are pressed together in the gap between the pressure roll 4 and the heating roll 5, and at the same time, the resin liquid is cured by irradiation with ultraviolet rays from the second irradiation section 7, so the lamination process is completed instantly. do.

Furthermore, as another embodiment, as shown in FIG. 3, an endless belt 14 made of an ultraviolet curing material is suspended between a mouth ring 15 and a tension roll 17, and a second irradiation section 7 is provided inside the endless belt 14. In addition, roll 15 and tension roll 17 may also be provided with corresponding pressure rolls 16,18.

In this case, the adherend 8 and the base material 9 are irradiated by the second irradiation section 7 while being pressed between the roll 15 and the tension roll 17 by the endless belt 14, so that the adherend 8 is completely bonded.

In the above case, instead of using an endless belt, a belt of a certain length may be used as a winding belt.

(Effects of the Invention) In summary, the present invention allows a relatively large amount of applied ultraviolet curable resin liquid to be dried to a semi-dry state in the first irradiation area of ultraviolet rays, then passes between pressure rolls, and then The resin liquid is completely cured by passing through the second irradiation part of the laminate to perform the laminating process. Therefore, in this invention, even the resin liquid applied in a relatively large amount on the adherend or base material does not leak out. Moreover, a product with more gloss than the laminating method previously proposed by the inventor of the present application can be obtained.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention. Figure 1 shows an embodiment in which the resin liquid is applied to the adherend, and Figure 2 shows the embodiment in which the resin liquid is applied to the substrate side. Fig. 3 shows another embodiment, and Fig. 4.5 shows an embodiment in which the second irradiation section is built into the pressure roll.

Claims (1)

[Claims] A relatively large amount of ultraviolet curable resin liquid is applied to either the recording material or the base material, and the ultraviolet rays are passed through the first irradiation section to make the resin liquid semi-dry. A laminating method characterized in that the resin liquid is bonded and cured onto the base material by passing between pressure rollers and a second irradiation side of ultraviolet rays while adhering the base material or adherend to the coated surface.