JPS5884793A - Transfer printing method - Google Patents

Abstract

PURPOSE:To conduct a transfer printing operation wherein a high adhesive force can be efficiently obtained without heating, by a method wherein activating liquids are coated respectively on printing surfaces of a transfer sheet and a body to be transfer printed thereon, the coated surfaces are laminated with each other, and a pattern to be printed is transferred onto the surface of the body by pressing the transfer sheet against the body. CONSTITUTION:The pattern to be printed is provided on releasing surface of a releasable sheet to produce the transfer sheet, the first activating liquid is coated on the printing surface of the transfer sheet thus obtained, and the second activating liquid is coated on the body to be transfer printed thereon. Then, the transfer sheet is laminated on the body so that the coated surfaces make contact with each other, the pattern is transferred onto the surface of the body by pressing the transfer sheet against the surface of the body, and thereafter the releasable sheet is released. Further, if required, a protective layer may be provided on the surface of the body on which the pattern is transfer printed. For example, a transparent coated film layer 2 to constitute a protective layer after transfer printing is provided on the releasing surface of the releasable sheet 1 as desired, then the pattern 3 to be printed is provided, and further an adhesive layer 4 is provided as desired to produce the transfer sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transfer printing method, and more specifically, by applying an activation liquid to the printing surface of transfer paper prior to transfer, it is possible to efficiently achieve strong adhesion without heating. The present invention relates to a transfer printing method for obtaining.

The transfer printing method is a method in which a transfer sheet is created by first printing on a suitable sheet, and then the transfer sheet is used to transfer the image to the object to be transferred. It is used when adding patterns to objects with rough surfaces, when direct printing is possible but when the amount of printing is small, or when the object to be printed is expensive and prone to loss. This is a convenient method that allows you to print as many copies as you need.

In the conventional transfer printing method, for example, printing is performed on a releasable sheet, and if desired, a heat-sensitive adhesive layer is sequentially formed, and the heat-sensitive transfer sheet created as described above is coated with a resin such as ABS, AS, or polyvinyl chloride. This is a process in which the stamping layer is placed on a molded product, pressed with a heating roll, and the printing layer or optionally provided heat-sensitive adhesive layer is thermally activated by the heat generated by the heating roll to perform transfer, and is usually referred to as "hot stamping." This is the way to be.

In the conventional transfer printing method described above, the adhesiveness necessary for transfer is generated by activation by heat brought from a heating hole, etc., and this method has high transfer efficiency, uniform and close contact. Although it enables high-strength transfer printing, due to the heat of heated rolls, etc., it is possible to print 14 times on transfer objects such as molded bodies made of synthetic resins with low softening points and foamed synthetic resins that are easily softened by heat. This is undesirable because the transferred object tends to undergo thermal deformation, thermal deterioration, etc., and if the amount of heat applied is lowered by changing 2AH[, transfer defects will occur, making it impossible to achieve the original purpose of transfer. Ta.

The present invention has been made in order to solve the above-mentioned drawbacks of the conventional methods.The present invention has been made in order to solve the above-mentioned drawbacks of the conventional methods. The main purpose of this method is to transfer the printed pattern onto the surface of the object by overlapping them so that they are in contact with each other and applying pressure, and then to peel off the releasable sheet.

The present invention will be explained in detail below using the drawings.

A publicly known transfer sheet can be used as the transfer sheet itself used in the present invention. For example, as shown in FIG. 1, a transparent coating layer 2, which becomes a protective layer after transfer, is formed on the release surface of a releasable sheet 1, if desired. Then, an I:II printing pattern 6 is formed 17, and if desired, an adhesive layer 4 is formed to prepare a transfer sheet.

Peelable sheet and 1. Any suitable paper, such as thin paper, high-quality paper, etc., or suitable plastic film, such as polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, etc., may be used as long as it has releasability on at least one side. Polyester, polyamide, acrylic such as polymethyl methacrylate, hydrochloric acid rubber,
Products obtained by coating the surface of ethylene-vinyl acetate copolymers, ionomers, etc. and other films or sheets with a removable paint made by adding silicone resin or wax to an appropriate vehicle, or polyethylene resin. , a film coated with a releasable resin such as polypropylene resin by exclusion coating can be used, or a suitable plastic film described in 2 can be used alone with a transparent film layer described later and a vehicle constituting a printed pattern. A single layer may be used in consideration of adhesive strength.

For the transparent film layer 2, an appropriate vehicle such as ethyl cellulose, ethyl hydroxide cellulose, cellulose acetate flobionate, nitrocellulose,
Cellulose derivatives such as acetic acid-hirulose, styrene l'41 resins such as polystyrene, polyα-methylstyrene, and styrene copolymer resins, acrylics such as polymethyl methacrylate, polyethyl methacrylate, polyethyl acrylate, and polybutyl acrylate. Or methacrylic resin alone or copolymer resin, rosin, rosin-modified maleic acid resin,
Rosin-modified phenolic resin, polymerized rosin and other ginsine ester superfats, polyvinyl acetate resin, coumaron resin, vinyl toluene resin, vinyl chloride resin, polyester resin,
Polyurethane flank, butyral resin, polyamide resin,
One or two of vinyl chloride-vinyl acetate copolymer resins, etc.
Add plasticizers, stabilizers, surfactants, wax grease, desiccants, auxiliary desiccants, hardeners, emulsifiers, thickeners, fillers, dispersants, solvents and diluents to the seeds as appropriate17. , kneading, and using known printing methods or known coating methods such as gravure coating, roll coating, air knife coating, kiss coating, spray coating, flowing coating, dip coating, spinner coating, wheeler coating, and brush coating. Formed by painting, solid coating by silk screen, wire barcode, flow coating, etc. The role of the transparent film layer formed as described above is to protect the printed pattern, which will be described later, after the transfer, and it may be omitted if the printed pattern after the transfer does not require much durability. , it can also be omitted when providing a protective layer in a separate process.

Next, the printed pattern 3 can be formed using a conventional ink using a vehicle similar to that used to provide the above-mentioned transparent film F-, using a known printing method.
It can be provided by gravure printing, gravure offset printing, lithographic offset printing, die litho printing, letterpress printing, intaglio printing, jet printing, silk screen printing, electrostatic printing, etc.

The adhesive layer 4 improves the adhesive force with the object to be transferred during transfer, and may be colored as desired to serve as a base layer, a printing layer or a transparent film layer provided as desired. You can omit it if it is thick enough, but if it is small/[
When necessary, it effectively contributes to adhesion.

The paint constituting the adhesive layer 4 can be made using the same vehicle as that used to form the above-mentioned transparent film layer, and the method for forming the adhesive layer 4 can also be the same as that described above. It can be provided by any known coating or printing method.

In addition, the vehicle for the ink or paint constituting the above-mentioned transparent film layer, printed pattern, and adhesive layer should take into consideration the adhesion between the releasable sheet, the transparent film layer, the printed pattern, the base layer, and the transfer target phase tj. It goes without saying that you should select and use them.

The first activating liquid is applied to the printed surface of the transfer sheet formed as described above, and the printed pattern and optionally provided adhesive layer and/or transparent film layer are wetted and activated. The first activating liquid used for this purpose may be one that partially dissolves or swells each layer of the transfer sheet, including the adhesive layer, printed pattern, and transparent film layer, and produces the tackiness necessary for adhesion. Alcohols such as methanol, ethanol, isopropanol, and n-butanol; esters such as methyl acetate, ethyl 11ate, isopropyl acetate, and n-butyl acetate, acetone, methyl ethyl ketone, and methyl isobutyl. Ketones such as ketones and cyclohexanone; Aromatic hydrocarbons such as benzene, toluene, xylene, and styrene; Aliphatic hydrocarbons such as cyclohexane, cyclopentane, and n-hexane;
It is possible to select from among ethers having an alcoholic hydroxyl group such as methyl cellosolve, ethyl cellosolve, and diethylene glycol 7-ethyl ether and mix them together for bJF.

In addition, the drying speed of the solvent, the application h, etc.
1. A synthetic resin may be added for the purpose of improving adhesion to the transfer target, and the synthetic resin added for this purpose may be the same as the vehicle used to form the transparent film layer described above. They can be appropriately selected and used, and 5 to 60 parts can be added to 100 parts of the solvents listed below.

Using the transfer sheet and the first activating liquid described below, the method of applying the activating liquid to the printing surface of the transfer sheet is 10. A method similar to the method for forming the transparent 11φ layer 4 can be mentioned, and the coating amount of the activating liquid is 3 to 3.
9? An” is appropriate.

Next, in the present invention, a second activating liquid is applied to the transfer target. As the second activating liquid, a one that partially dissolves or swells the transferred material is selected from among those listed as the above-mentioned $1 activating liquid, and also,
There is no problem in adding an appropriate synthetic resin for the same purpose as the activation liquid, and the same synthetic resins as those mentioned above can be added in the same proportions. Further, the composition of the second activating liquid may be the same as the composition of the first activating liquid.

Examples of preferable activating liquids depending on the material of the transfer target are shown below.

As a method for applying the above-mentioned second activating liquid to the transfer target, there may be mentioned a known application method, for example, a method similar to the method for forming the above-mentioned transparent film layer, and @
The application amount of active 1 solution of 2 is 5 to 10 sif/yn"
is appropriate.

After applying the first activating liquid to the printing surface of the transfer sheet and applying the second activating liquid to the transfer object as described above, if necessary, apply the activating liquid to the printed pattern and the desired After allowing the necessary open time for wetting and activating the adhesive layer and/or transparent film layer provided by The printed pattern is transferred to the surface of the object by overlapping and applying pressure so that the surfaces of the inner cloth are in contact with each other, and then the releasable sheet is peeled off.

The above-described transfer process can be carried out using, for example, the existing laminated sheep tar (1
This can be carried out using a transfer device configured in a similar manner.

FIG. 2 shows an example of the apparatus used in the transfer printing method of the present invention. The transfer sheet (A) supplied from the paper feeder 11 is transferred by a printing apparatus consisting of an ink pan 12, a roll 13, a doctor 14, and a backup roll 15. , printing surface C2 1st
The second activating liquid is applied to the transferred object 17, which is conveyed by the belt 16 and previously coated with the second activating liquid. ! l:
The sheets are overlapped and pressed by pressure rolls 18 and 18', and then the releasable sheet is peeled off to reach the discharged sheet 19. The conditions for applying pressure by the pressure rolls 18 and 18 vary depending on the transfer sheet, the first and second activating liquids, and the object to be transferred, but the linear pressure is 1 to 5" f/1.
However, if necessary, a protective layer can be further provided on the surface of the transfer-printed object.

The protective layer can be provided using a commonly available paint by a known method, and the paint vehicle can be selected from among the same vehicles used when forming the above-mentioned transparent film layer (with two phases). However, in order to further improve the surface strength, it is preferable to use a curing type vehicle, and when the transferred object is made of a material with relatively poor heat resistance such as a thermoplastic synthetic resin, it is preferable to use an ultraviolet curable compound.
By using a paint made of a compound or a paint made of an Ichiko radiation-transferable compound, and curing it by irradiating it with ultraviolet rays or electron beams after application, it is possible to form a protective layer without damaging the object to be transferred by heating. be.

The protective layer may, if desired, be one that has been adjusted to a predetermined gloss by adding phosphoric acid, calcium carbonate, etc., or one that has been coated with a suitable transparent color. By forming such a protection 1-, the printed pattern can be protected and the surface properties can be improved.
The method of the present invention allows for efficient and reliable transfer without the need for heat deformation and thermal deterioration. It is possible to transfer print onto non-stick materials without damaging their materials, and even materials that are sensitive to heat pressure, such as foam, can be used for transfer printing, and even without heating. It is possible to prevent the occurrence of transfer defects (pinholes, etc.) due to the inclusion of air bubbles.

In particular, in the present invention, since the activating liquid is applied to both the printing surface of the transfer sheet and the surface of the object to be transferred,
Some unevenness of the transferred object, the thickness of the transfer sheet, or the surface of the pressure roll or pressure plate.
Even if there are convexities, they can reduce the effect they have on the interface where the activating liquid coated surfaces of the transfer sheet and the transfer target come into contact with each other, so pinholes are almost never caused in the transfer. Who?

In addition, by selecting the composition of the first and second activating liquids, especially if each activating liquid is added with an appropriate synthetic resin, they act as a brimer, so that Even if a transfer sheet having a printed pattern made of a vehicle that does not have a very strong adhesive force is used, it has the effect of firmly adhering the printed pattern to the object to be transferred by transfer.

Examples are given below to further illustrate the present invention.

Example 1 A releasable sheet was prepared by extrusion coating polyethylene resin on one side of tissue paper (Tsubo: 50 St/ln") to a coating thickness of 30 μm. On the peeled surface of
Filling with ink for printing polyvinyl chloride sheets consisting of a vehicle mainly composed of vinyl chloride/vinyl acetate copolymer
A transfer sheet was created by printing a pattern using gravure printing.

Next, a non-plasticized polyvinyl chloride extrusion molded product with a 2M gap filled with foamed urethane resin is prepared as a transfer object, and an activating liquid having the following composition is applied to the printed surface of the transfer sheet and the surface of the transfer object. Each applicator (i'!
i+! Immediately after coating, align the activating liquid applied surface of the transfer sheet with the activating liquid applied surface of the transferred object and apply a linear pressure of 2"I/r using a rubber roll.
After applying pressure, the releasable sheet of the transfer sheet was peeled off to obtain a transfer member with a pattern transferred to the surface of the transfer member.

Activation liquid composition Example 2 Same as Example 1 except that the releasable sheet was not peeled off immediately after pressurization, but after being left as it was for 24 hours, the releasable sheet was peeled off.
It's 41EL.

The transfer body obtained as described above has a pattern adhesion strength that is higher than that of the transfer body obtained in Example 1.

Example 6 A polyester film (thickness 50 μm) was used as a releasable sheet.
m), a transparent protective layer was applied to the entire surface by solid gravure printing using a transparent paint containing vinyl chloride/vinyl chloride copolymer and acrylic resin as a vehicle on one side of the same film, and then the same as above. After printing a pattern using an ink consisting of a vehicle, a composition containing polyvinyl chloride resin as a monomer is applied to the entire surface by gravure printing to form an adhesive layer, and a transfer sheet is created as described above. did.

Thereafter, in the same manner as in Example 1, a transfer body having a protective layer on the surface was obtained.

The resulting transfer body has improved surface abrasion resistance and pattern adhesion compared to the transfer 16 unit obtained in Example 1'c.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a transfer sheet used in the present invention, and FIG. 432 is a schematic diagram showing an example of an apparatus used in the transfer printing method of the present invention. 1・・・・・・・・・・・・・・・Peeling t4111/I Sea]・2・・・・・・・・・・・Kaminhide 111A layer 6
......Printed pattern 4...Adhesive layer A...Transfer sheet 11...
..... Paper feed 12 ..... - Ink pan 13 ..... - Roll 14 ..... Doctor 15 ... .... Backup roll 16...
......Belt 17...Transferred object 18.1...Pressure roll 19...Wandering Paper Fig. 1 Fig. 2 figure

Claims (2)

[Claims] (1) Form a transfer sheet by providing a printed pattern on the release surface of the release sheet, and apply the first activation liquid to the print surface of the obtained transfer sheet [7. Apply the second activation liquid to the transfer target. The liquid is applied, and then the transfer sheet and the object to be transferred are stacked so that the sides coated with the activating liquid are in contact with each other and pressure is applied to transfer the printed pattern to the surface of the object to be transferred. A transfer printing method characterized by peeling off the sheet. (2) The transfer printing method according to claim 1, which comprises providing a protective layer on the nail over the printed pattern transferred to the surface of the transfer object after peeling off the releasable sheet.