JP2941929B2 - Method of forming transfer printing layer by hydraulic pressure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for forming a transfer printing layer in which a printing layer in a transfer sheet is transferred to the surface of various molded products using hydraulic pressure.

[Prior Art] A printing layer is formed on a surface as a means for applying a painting with a printing layer to the surface of various molded articles having a complicated surface shape such as a three-dimensional surface (three-dimensional shape) or a curved surface due to unevenness. After applying the activator to the printing layer of the transfer sheet, the floating sheet is floated on the water surface (liquid surface) such that the surface to which the activator is applied becomes the upper surface, and further applied for painting. A method of transferring a printing layer of a transfer sheet onto the surface of a transfer target by pressing a predetermined transfer target from above (see Japanese Patent Publication No. 52-41683 and Japanese Patent Application Laid-Open No. 54-33115) is used.
No.).

In the transfer printing method using such a liquid pressure, the activator is conventionally applied to the printing layer surface of the transfer sheet by a spray method or a roll coating method using a gravure printing roll using a grid plate.

[Problems to be Solved by the Invention] However, when the above-mentioned activator is applied by a spray method, it is difficult to apply the activator uniformly over the front width of the transfer sheet. However, there are drawbacks such as that the sheet protrudes from the width of the transfer sheet and goes around the back surface of the sheet.

Also, in the case of the roll coating method using a gravure printing roll using a grid printing plate, coating unevenness caused by the cell of the grid printing plate attached to the gravure printing roll appears, and the transfer performance of the transfer sheet is reduced. In addition to non-uniformity, if the amount of the activator applied is increased by increasing the plate depth in order to enhance the transfer performance, there is a disadvantage that the spots of application of the activator become larger.

On the other hand, the method of forming a transfer printing layer by hydraulic pressure according to the present invention is characterized in that the activator is applied to the transfer sheet. Even with a gravure printing roll having a shallow depth, a large amount of activator can be uniformly applied, so that a high-quality transfer printing layer can be obtained.

[Means for Solving the Problems] The method for forming a transfer printing layer by hydraulic pressure according to the first invention is as follows.
A step of applying an activator to the print layer surface of a transfer sheet comprising a water-soluble or water-swellable support having a print layer on the surface, a step of floating the transfer sheet on the liquid surface, and Transferring the print layer of the transfer sheet to the transfer-receiving member by pressing the transfer layer onto the transfer sheet from above, and applying the activator to the print layer surface of the transfer sheet by oblique lines. It is performed by a gravure printing roll using a plate.

The method for forming a transfer printing layer by hydraulic pressure according to the second invention is as follows.
In the method for forming a transfer printing layer by hydraulic pressure according to the first aspect of the present invention, 10 g (w
et) / m ² or more of the activator.

In the method for forming a transfer printing layer by liquid pressure of the present invention having the above-mentioned configuration, a water-soluble or water-swellable support for forming a printing layer for transfer has a sheet that dissolves or swells by reacting with water. Is used. In particular, after the transfer step,
A water-soluble support is preferred because it is easy to remove the support.

Incidentally, the water-soluble or water-swellable support, for example,
Supports described in JP-B-52-41683 and JP-A-54-33115, such as polyvinyl alcohol resin, dextrin, gelatin, glue, casein, shellac, gum arabic, starch, protein, and polyacryl Acid amide, sodium polyacrylate, polyvinyl methyl ether, copolymer of methyl vinyl ether and maleic anhydride, copolymer of vinyl acetate and itaconic acid, polyvinyl pyrrolidone, acetyl cellulose, acetyl butyl cellulose, carboxymethyl cellulose, methyl cellulose, A film having a thickness of about 10 to 100 μm made of hydroxyethylcellulose, sodium alginate or the like is used, and a water-soluble or water-swellable support in a transfer sheet used in a conventional method of forming a transfer printing layer using hydraulic pressure is used. The same kind is used.

The transfer printing layer on the surface of the water-soluble or water-swellable support is one in which the binder resin in the printing layer is activated by an activator applied to the transfer sheet. The type of the agent is selected in combination with the binder resin used in the printing layer.

Needless to say, the printing ink used for forming the transfer printing layer contains a coloring agent such as a dye or a pigment, as well as a dispersant, a plasticizer, an extender, and the like as necessary.

The printing layer on the water-soluble or water-swellable support may be formed, for example, by intaglio printing, lithographic printing, letterpress printing, screen printing, brushing, spatula coating, spraying, or the like. It is formed as a printed layer for symbols and the like.

Examples of molded articles used as the transfer object include resin molded articles made of polystyrene resin, ABS resin, polycarbonate resin, melamine resin, phenol resin, urea resin, cellulose resin, woody molded articles, ceramic molded articles, stones, etc. And is not particularly limited.

As shown in FIGS. 2 (1) to (3), a gravure printing roll using a diagonal printing plate used for applying the activator is used.
A bank comprising a bank a and a cell b;
Compared with the gravure printing roll using the grid plate shown in FIGS. 1 to 3, that is, the gravure printing roll using the grid plate composed of the bank c and the cell d, the number of banks is smaller and the (cell area) The cell-to-bank ratio per unit area indicated by (/ bank area) is large and has continuous cells.

[Operation] In the method for forming a transfer printing layer by hydraulic pressure of the present invention,
The gravure printing roll by the oblique printing plate used when applying the activator to the surface of the transfer sheet has a smaller number of banks than that of the gravure printing roll by the grid printing plate, that is, is represented by cell area / bank area. Since the cell-to-bank ratio per unit area is large and the cells are formed continuously, the activator does not get on the plate surface in the activator application step, and the surface of the transfer sheet The activator can be applied very well.

Therefore, compared with the case where a gravure printing roll using a grid plate is used, even if the plate depth is shallow, a larger amount of the activator can be applied. It can be applied without occurring.

[Example] Hereinafter, a specific configuration of the method for forming a transfer printing layer by hydraulic pressure according to the present invention will be described with reference to examples.

Example 1 Preparation of transfer sheet A gravure printing ink with the following ink composition [1] [Showa Ink Kogyo Co., Ltd.] on the surface of a 40 μm thick polyvinyl alcohol resin film [Nichigo Film Co., Ltd .: Hitheron] :] To form a wood-grained printed layer, and after drying, take up with a roll to obtain a take-up roll for a transfer sheet.

Ink composition [1] (1) Colorant disazo yellow monoazo charcoal cyanine blue carbon black 6 to 40 parts by weight (2) Binder component nitrocellulose 5 to 15 parts by weight Alkyd resin 1 to 5 parts by weight ( 3) Solvent Toluene 50-80 parts by weight Preparation of activator An activator having the following mixed composition [2] was prepared.

Mixed composition [2] (1) Butyl methacrylate 8 parts by weight (2) Extender (precipitable barium) 20 parts by weight (3) Plasticizer (DBP) 20 parts by weight (4) Solvent Butyl cellosolve acetate ... 26 parts by weight Butyl carbitol acetate ... 26 parts by weight Molding of transfer object An injection molded article of polystyrene resin for an air conditioner panel was used as the transfer object.

Transfer Printing by Hydraulic Pressure In FIG. 1, the transfer sheet 11 is rewound from the transfer sheet take-up roll 10 described above, and a gravure printing roll and press using a 70 μ × 100 / inch oblique printing plate indicated by reference numeral 12 are used. One set of rolls including the roll 13 is guided to a coating device set to a liquid tank 15 in which the activator 14 is stored, and a coating amount of 13 g (wet) is applied to the printing layer surface of the transfer sheet 11. / g / m ² of activator 14 was applied.

Subsequently, the transfer sheet 11 was placed on a surface of water 16 at a water temperature of 30 ° C. so that the printing layer surface on which the activator was applied was the upper surface.
After 70 seconds, the polystyrene resin molded body 17, which is the above-mentioned transfer-receiving body, is pushed in from above, and the transfer sheet 11 is extended and brought into close contact with the surface of the molded body 17, and then the molded body 17 is pulled out of the water. After being immersed in warm water of 40 ° C. for 30 minutes, showering with fresh water, removing the polyvinyl alcohol resin film in the transfer sheet, and further subjecting the transfer sheet to a drying process, an air-conditioning panel having a wood-grained transfer printing layer was obtained. Obtained.

During the step of forming the transfer printing layer by liquid pressure comprising the above step, there is no unevenness in the application state of the activator on the transfer sheet, and the amount of the activator applied is sufficient, and the printing pattern of the transfer sheet is The transferability of the layer was very good, and the transfer printing pattern layer in the obtained molded article was also very beautiful.

Comparative Example 1 In the step of forming a transfer printing layer by hydraulic pressure in the above-described Example 1, instead of the gravure printing roll 12 using a 70 μ × 100 / inch oblique printing plate, a gravure printing using a 70 μ × 100 / inch grid printing plate was used. Using a roll, the amount of the activator applied to the transfer printing layer surface of the transfer sheet 11 is 9 g (we
t) / m ² .

In the activator application step, in the application state of the activator on the transfer sheet, a grid-like spot caused by the gravure printing roll plate appears, and the activator application amount is insufficient. The transferability of the transfer sheet was not good.

In the transfer printing pattern layer in the obtained air conditioner panel, a part where the transfer is not performed occurs in one part thereof, and the transfer printing pattern layer of the wood grain pattern also has a lattice shape caused by the gravure printing roll plate. The spots were slightly observed.

Comparative Example 2 In the step of forming the transfer printing layer by the liquid pressure of Example 1 described above, instead of the gravure printing roll 12 using a 70 μ × 100 / inch oblique printing plate, a gravure printing using a 120 μ × 60 / inch grid printing plate was used. Using a roll, the amount of the activator applied to the transfer printing layer surface of the transfer sheet 11 is 13 g (we
t) / m ² .

In the activator application step, grid-like spots due to the plate of the gravure printing roll appeared very remarkably in the application state with the activator on the transfer sheet. There was no poor transferability due to insufficient amount.

However, in the transfer printing pattern layer of the wood pattern in the obtained air conditioner panel, grid-like spots due to the gravure printing roll plate were remarkable.

[Effects of the Invention] The method for forming a transfer printing layer by liquid pressure according to the present invention is a method for forming a transfer printing layer comprising a water-soluble or water-swellable support having a printing layer on the surface of a transfer sheet using a stencil printing plate. After applying the activator using a roll, the transfer sheet is floated on the liquid surface, and further, the object to be transferred is pressed onto the transfer sheet from above the liquid surface, thereby forming a print layer on the transfer sheet. Transfer to an object to be transferred.

In the method of the present invention having the above configuration, as is apparent from the examples, the activator is applied to the printing layer of the transfer sheet by using a gravure printing roll by oblique printing. As in the case of the roll coating method using a gravure printing roll,
Smooth transfer of the transfer sheet is possible because no coating spots are generated due to the cells of the grid plate attached to the roll, and a sufficient amount of activator can be applied even when the plate depth is shallow. And evenly.

Therefore, in the method of forming a transfer printing layer by hydraulic pressure of the present invention, a high-quality transfer printing layer can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a schematic process diagram illustrating a method for forming a transfer printing layer by liquid pressure according to the present invention, and FIG. 2 (1) is a schematic view of a roll of a gravure printing roll by oblique printing used in the method of the present invention. FIG. 2 (2) and FIG. 2 (3) are front views for explaining the shape.
FIG. 3 is an enlarged perspective view of a part of the plate of the gravure printing roll formed by oblique printing. FIG. 3 (1) is a front view illustrating the overall shape of the plate of the gravure printing roll formed by lattice printing. 2) and FIG. 3 (3) are enlarged perspective views of a single cell of a roll for gravure printing using a grid printing plate. 11: Transfer sheet, 12: Roll for gravure printing with oblique lines, 14: Activator, 17: Transfer receiving object to be subjected to transfer printing.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-117900 (JP, A) JP-A-2-117899 (JP, A) JP-A-2-99400 (JP, A) JP-A-63- 288800 (JP, A) JP-A-60-165300 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B44C 1/175

Claims (2)

(57) [Claims] 1. An activator is applied to the surface of a transfer sheet comprising a water-soluble or water-swellable support having a print layer on the surface, and then the transfer sheet is floated on the liquid surface and further transferred. A method for forming a transfer printing layer by liquid pressure, comprising transferring a printing layer on a transfer sheet to a transfer target by pressing a body onto a transfer sheet from above a liquid surface, wherein the printing layer surface of the transfer sheet is A method for forming a transfer printing layer by liquid pressure, wherein the activator is applied to the gravure printing roll using a diagonal printing plate. 2. The method according to claim 1, wherein the amount of the activator applied is 10 g (wet) / m ² or more.