JPS60192700A - Infiltrating printing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a penetrant printing method using an adhesive printing sheet.

The penetrant printing method involves heating penetrating ink (ink containing dyes and pigments with sublimation properties) in close contact with the surface of plastic materials, allowing the dyes and pigments in the ink to penetrate into the plastic material. A printing method that removes the ink film remaining on the surface after printing, which was developed by the Japanese Patent Publication Publication No. 40-24
It is publicly known from Publication No. 343 and the like.

By the way, regarding this conventional printing method.

To bring the printing ink film into close contact with the printing material, should a printing machine be used to print directly onto the surface of the printing material?

Alternatively, a method has been used in which only the printed film is thermocompressed using a hot stamp using a transfer paper, and then the transfer paper is peeled off. However, with these methods, it is difficult to print on quadratic curved surfaces at 1% of the time when printing on curved surfaces, and cleaning with a solvent or the like is required to remove the printed film that adheres to the surface after printing. . This solvent cleaning step is an operation not found in general printing methods, and is time-consuming and complicated, and the solvent is expensive, resulting in high costs. Furthermore, as a printing method for quadratic curved surfaces, there is a printing method that uses a flexible pad (commonly known as tacho printing), but this method requires a special pad and machine, and the printing efficiency is poor. Solvent cleaning could not be omitted.

In addition, there is a method disclosed in Japanese Patent Publication No. 58-155957, which uses a printed transfer sheet, but since the sheet does not have adhesive properties, it is necessary to keep pressing it with a transfer pad. It is necessary to heat the material in the same state, which makes the mechanical equipment complicated and inefficient. Curved surface printing requires a special pad that fits the curved surface, which makes it expensive.
Further, there were disadvantages in that it was difficult to control heat and the defective rate due to printing spots was high.

The present invention aims to correct the defects in paper, and its purpose is to make it possible to easily and reliably adhere the printing sheet to the substrate by using an adhesive printing sheet. In addition, there is no need to keep pressing with a transfer pad during heating, and it is extremely easy to adhere to quadratic curved surfaces, and it is easy to adhere to and does not require special mechanical equipment. The object of the present invention is to provide a penetrant printing method that does not require a cleaning process.

The printing/printing sheet with adhesive properties used in the present invention refers to the printing ink that has penetrability on the base material sheet to form desired characters, figures, symbols, etc., and to impart adhesive properties to the base sheet. Applying an adhesive to the base sheet, using a sheet with adhesive properties on the base sheet itself, using ink with adhesive properties on the ink itself, or combining these It is. This adhesive printing sheet is then used by adhering it to the surface of the printing material.

Examples of the present invention will be described in detail below, since the present invention is an improved method of penetrant printing.

The printing substrate is a known plastic material capable of penetrant printing. Further, as the printing ink, in addition to a known penetrating printing ink, an adhesive ink described below is used. These inks contain sublimable dyes and pigments. In addition, in the present invention, instead of directly printing on plastic molded products with these inks, the desired shape, etc. is first printed on the surface of the base sheet, and this sheet is attached to the substrate. This is a method in which the dyes and pigments in the ink are heated to penetrate into the plastic material and transferred, and the sheet is then peeled off.

The base sheet used in the present invention is thin, durable, and has good printability, and when using the permeation printing method, it is heated at around 200°C for several minutes.

It is necessary to choose a material that will not burn, deteriorate, bend, warp, or expand or contract under these conditions. In addition, since the sheet is used with the printed side facing inside, it is desirable that the sheet be transparent or semi-transparent so that the printed image can be seen from the back side.Furthermore, since the sheet may be pasted onto a quadratic curved surface, it will easily adapt to the curved surface. A flexible material is preferred. As such a material, paper, cloth, glass film, metal foil, or a lamination of these materials is generally used. There are many types of paper, including art paper, glassine paper, coated paper, and cellophane paper, which are thin, flexible, and durable, and are inexpensive, transparent, and easy to use.Also, the adhesives and inks described below adhere strongly to the paper surface. Although it has the advantage of being excellent in removability without leaving any residue on the surface of the printed material,
It has the disadvantage of relatively large expansion and contraction due to heat and moisture.

Therefore, it is a good idea to laminate the plastic or use a glue.

Metal foils such as aluminum foil (about 20 microns thick) can withstand high temperatures and conform well to quadratic curved surfaces, but they have the disadvantage of being opaque. In this regard, plastic films are suitable as they are flexible, transparent, thin, durable, smooth and printable, but caution is required as there are restrictions on the temperature at which they can be used and some may shrink at high temperatures. be. For plastic films, the thickness of highly heat-resistant resin films such as polyethylene terephthalate, polyamide, polyimide, fluorocarbon resin, polycarbonate, and polypropylene is 10~
A material with a diameter of about 100 microns is easy to use. Further, these films may be laminated and used. Further, a thin film sheet made of a hot melt adhesive or a rewet adhesive, which will be described later, can be used as it is as the base sheet. In the present invention, an adhesive and permeable printing are applied to the above-mentioned base sheet to produce a printed sheet having adhesive properties.

The adhesive used in the present invention must bring the printed sheet into close contact with the printing substrate, must remain in close contact during the heating period, and must be peelable after heating without leaving any stains. Adhesives that can be used for this purpose include adhesive-type adhesives that maintain tackiness at all times, hot-melt adhesives that become adhesive when heated, or adhesives that become adhesive when moistened with water. There are rewet adhesives that recover adhesive properties, but these adhesives can also be used in combination. Adhesive type adhesives are tacky at room temperature and have pressure-sensitive adhesive properties that allow them to be adhered with slight pressure, and they also have good removability so that they can be peeled off without staining the surface of the object to be adhered to after heating.

As such adhesive, commercially available acrylic resin-based Arontac-AC-2433H (manufactured by Toagosei Kagaku Co., Ltd.) is available.
, Sony Bond 80820 (manufactured by Sony Chemical Co., Ltd.), Cypinol AC60 (manufactured by Saiten Chemical Co., Ltd.), Cemedine CT-1300 (manufactured by Cemedine Co., Ltd.), Bon F"cE5
00H (manufactured by Bond), etc. In addition, there are silicone-based products such as silicone, varnish 101.1o (manufactured by FtM Kagaku Co., Ltd.), adhesive YR3340 (Toshiba Silicon Co., Ltd.), and synthetic rubber-based products such as Cemedine HPS-19 (manufactured by Cemedine Co., Ltd.) and Bond CEI00. (manufactured by Bond Co., Ltd.), Aλ Print, 1500 (manufactured by Yoshikawa Kako Co., Ltd.), etc.In addition, permanently adhesive polybutene, polyisobutylene, polyacrylic ester, etc. may be used.These adhesives are It is suitable for printing, and its adhesive strength does not decrease much when heated, but it is always sticky.

It is necessary to protect the surface by pasting release paper, etc., to prevent flakes from adhering to it.

In addition, 1 is used for hot melt adhesives, and BOND MP is used for commercially available products.
700. There are Bond BC600, Bond PC425 (all manufactured by Bond Co., Ltd.), Aronmel) PESIIOH (manufactured by Toagosei Kagaku Co., Ltd.), and other resins such as vinyl acetate resin,
Polyamide resin, polyethylene, wax, rosin,
Asphalt and the like can also be hot melt adhesives.

When heated, these materials melt and create adhesive strength, so they must be heated to adhere them to the printing material, but they remain solid when cold and are not sticky, so they can be made into thin sheets. Therefore, by applying desired printing to such a sheet using a penetrating printing ink, it is possible to produce a printed sheet that has adhesive properties to the sheet itself. Commercially available hot-melt adhesive sheets include Diamid film (manufactured by Daicel Chemical Co., Ltd., nylon 12 film),
Elfan NT film (polyamide film), Elfan Un (polyurethane film), Elfan PH
(yN Lyester Film), (all manufactured by Nippon Matai Co., Ltd.), etc. Printed sheets printed on these films can be easily adhered by heating the substrate and pressing the sheet onto it, and it also softens and becomes flexible, making it compatible with quadratic curved surfaces. Glued. When cooled, it solidifies and can be peeled off.

Next, as the rewetting adhesive, glue, starch, dextrin, sodium alginate, konjac powder, carboxymethyl cellulose (CMC'), polyvinyl alcohol, etc., which become adhesive with water, are used. These adhesives dry when heated and lose their adhesion to plastic materials, so do not use them alone; instead, print on the adhesive coated surface or film with adhesive ink (described below) to strengthen the adhesive. It is a good idea to make a printed sheet by doing this. Since printing ink is oil-based, it can be re-wetted with water without any negative effects.

Next is the printing ink used in the present invention.

General penetrant printing inks can be used. Inks for penetrant printing include sublimable dyes and pigments 1, such as Sumikalon dye and Sumiplast pigment (manufactured by Sumikagaku Co., Ltd.).

The ink is a mixture of Kayaset dye (manufactured by Nippon Kapaku Co., Ltd.), Iketone dye (manufactured by Ikeda Chemical Co., Ltd.), etc., with an ink vehicle, but in the present invention, rather than printing directly on the printing material, it is printed once on the base sheet. This is a method in which the image is transferred in close contact with the printing material. Generally, printing ink loses its adhesive strength when the solvent evaporates and solidifies. Therefore, the printed sheet after drying usually has no adhesive strength. However, with vinyl chloride vehicles, etc., they melt and become viscous when heated, and plastic base sheets can also be attached to the printing material by static electricity, but in the penetrant printing method, dyes and pigments are Since printing is performed by migration, if these adhesives have a weak adhesive force, the migration will become diffuse and the printed image will become blurred, making it impossible to print satisfactorily. It was absolutely necessary to keep the printing ink film in strong contact with the printing material during heating. So, JP-A-58-1
In the method disclosed in No. 55957, it is necessary to continue pressing while heating using a heating pad, and in the present invention, an adhesive is used to adhere the printed sheet. However, in general penetrating printing inks, the ink film itself basically has no adhesive properties. Therefore, in the case of a solid printed image with a wide area, in the present invention, even though adhesive is placed around the ink film to achieve close contact, air bubbles etc. There is a risk that the ink film will float due to retention of ink. When the ink film floats, the penetration of the dye and pigment into that area is insufficient and color spots occur. Therefore, in the present invention, the inΦ film itself is provided with adhesive properties as necessary to ensure the best possible results. In order to impart adhesive properties to the ink film, it is necessary to mix at least 20% or more of the above-mentioned adhesive or tacky substance into the ink components. In particular, many pressure-sensitive adhesives have excellent printability, such as Sony Bond 5C820 (manufactured by Sony Chemical Co., Ltd.) and Arontack AC-2422H (manufactured by Toagosei Kagaku Co., Ltd.).

Adhesive inks made by mixing Silicone Fes 101/10 (manufactured by Shin-Etsu Chemical Co., Ltd.) with sublimable dyes and pigments are adhesive at room temperature, have sufficient adhesive strength when heated, and are removable after cooling. It has good properties and is easy to use. Therefore, when such an adhesive ink is used, it is not necessarily necessary to use an adhesive on other parts.

Next, the above-mentioned adhesive or printing ink is applied to the surface of the base sheet, and in general, a film of these is formed on the entire surface or necessary portions of the sheet by coating or printing. For this purpose, known methods such as gravure printing, offset printing, screen printing, and roll coater can be used, and mass production is possible.

The order in which the film is formed may be selected as appropriate depending on the circumstances of the work, but when some adhesive adhesives or hot melt adhesives come into contact with a penetrating ink film, the dyes and pigments in the ink permeate and become contaminated. There are things to do. When such an adhesive is used, a gap may be provided so that the printing ink film and the adhesive film do not come into contact with each other, or a diaphragm may be formed between the two to prevent ink from penetrating therebetween.

Suitable membrane materials include starch, dextrin, polyvinyl alcohol, carboxymethyl cellulose, or a film of thermosetting resin such as phenol resin. Alternatively, paper, polyimide film, or the like may be cut and partially pasted. Furthermore, since the ink permeates the base sheet itself, such as polyethylene terephthalate, polypropylene, polycarbonate, etc., it is safer to provide a diaphragm.

In this way, the printed sheet with adhesive properties of the present invention is a sheet in which desired printing and adhesive are formed on a base sheet. ). This is generally done around the edges of the shape in order to peel off the required number of printed shapes from the sheet and use them when applying the sheet to the printing material due to the need for mass production of sheets and simultaneous multi-piece printing. Put a slit in it.

In the present invention, in addition to this, slits of various shapes are made at appropriate positions around the printed image in order to adhere the sheet well to quadratic curved surfaces.

The stiffness of the base sheet is relaxed.

Even if the sheet slightly expands, contracts, or curves during heating, this slit prevents the stress from being cut off and spread to the printed area, ensuring the adhesion of the printed image area. This is because it is useful.

Next, to outline the penetrant printing method of the present invention, for a sheet with release paper pasted, the release paper is first peeled off.

Usually, the printed image is printed upside down, so the sheet is pasted with the printed side facing inside so that the printed image is accurately positioned at the desired location on the printing material.

At this time, if the sheet is transparent and the printed image is visible from the back side, it is easy to confirm the first position. Furthermore, the flexibility of the base sheet and the slits make it easy to adhere to quadratic curved surfaces.

If the printed sheet is always sticky, it can be adhered simply by finger pressure or palm pressure.

Pressure may be applied mechanically. In addition, in the case of a hot-melt type sheet, the sheet is heated to a temperature at which tackiness occurs, the substrate to be printed is heated, or a hot press is used to bring the sheet into close contact with the sheet. In addition, for the 6 wet type, you can moisten it with water or
Dip in a saturated steam bath for a few seconds to restore adhesion before applying. After pasting is completed, without applying any external force,
The printing sheet is brought into close contact with the surface of the printing material only by the adhesive force of the adhesive, and then placed in a heating furnace or the like and heated.

In principle, any heating method may be used, but in the present invention, adhesion is maintained only by the adhesive strength of the sheet, and the adhesive strength of adhesives generally tends to loosen when heated. At this point, heating methods that apply external force in the direction of peeling the sheet, such as strong wind or strong vibration, should be avoided. Further, the heating temperature and heating time are the same as those in known permeation printing methods, and are appropriately determined depending on the type of plastic material. For example, for polypropylene, at 130-140℃ for 2-5 minutes,
1 at 180-200℃ for polybutylene terephthalate
~5 minutes. A sheet pasted by such heating will not burn or deteriorate, and will hardly expand, contract, or bend. Even if there is a slight expansion or contraction, the slit blocks the influence, ensuring the adhesion of the sheet and preventing the printed surface from loosening.

After heating is completed, the sheet is peeled off from the printing target. At this time, the sheet will not break or become stuck and difficult to peel off. Furthermore, at the same time as the sheet is peeled off, the printing ink and adhesive adhere to the sheet side, peel off, and do not remain on the surface of the printed material. Although this peeling may be performed while it is hot after heating, re-peelability is generally better if it is performed after cooling. Furthermore, when the film is peeled off, if the temperature and heating time are appropriate, the desired shape will be clearly printed on the surface of the printing material due to the dye and pigment that has penetrated into it. This printed figure is extremely resistant to friction because the ink penetrates into the plastic body and is applied just like a ``tattoo'' on the human body. Examples are shown below.

Example 1 Black dye (Kayacera)N manufactured by Nippon Kapowder Co., Ltd. [30 of 1922]
and 70 parts of a pressure-sensitive adhesive, Sonybond SC820 (manufactured by Sony Chemical Co., Ltd.) to prepare an adhesive ink.

Using this ink, arithmetic numerals are printed in reverse on a 25 micron thick polyimide film (manufactured by Toyo Rayon Co., Ltd., trade name: Kapton Film), which is a base sheet. On the other hand, on the release surface of glassine paper whose surface has been subjected to silicone release treatment, the arithmetic numerals are printed in "positive" with Sony Bond 5C820 adhesive on a solid surface with slightly thick white outlines. Then, both are pasted together with the printed sides facing inside. A printout with the arithmetic numerals surrounded by adhesive is created, so next we cut a 0-o slit into the base material sheet at a distance of 2 mm from the numerals, matching the concave shape of the surface of the typewriter key that is the printing material. , and cut through the adhesive layer below to create a printed sheet. Next, when this sheet is peeled off from the release paper, a printed sheet with black arithmetic numbers surrounded by adhesive is obtained, which is pasted onto the surface of a polybutylene terephthalate key using finger pressure. Since the base sheet is transparent, it is easy to confirm the position, and the slit allows the base sheet to be closely attached to the concave surface of the key. Then keep it at 180℃
The base sheet is heated by placing it in a heating furnace for 3 minutes, and after cooling, the base sheet is peeled off. The printing ink film and adhesive adhered to the base material 7-t side and peeled off, no foreign matter adhered to the key surface, black arithmetic numerals were printed, and there was no need for cleaning with a solvent.

Example 2 30 parts of Sumiplast Blue G pigment (manufactured by Sumima Kagaku Co., Ltd.),
An ink was prepared by thoroughly mixing 70 parts of the acrylic adhesive Cypinol DB130 (manufactured by Saiden Chemical Co., Ltd.), and this ink was used to print "
Print a “leaf” pattern, then polyvinyl alcohol-A/
(1) Using a 20% aqueous solution, print the same slightly larger leaf pattern overlappingly, then apply adhesive silicone and varnish 101/10 (manufactured by Shin-Etsu Chemical Co., Ltd.) to the entire surface, and then A polyethylene terephthalate sheet with a thickness of 25 microns was adhered to the surface, and two straight slits were made on the left and right sides of the printing surface to match the inclination of the polypropylene tip that was the printing material to make a printed sheet.

This sheet was peeled off from the release paper and adhered to the side of the tip using pressure from the palm of the hand. The sheet was transparent and it was easy to confirm the position. Next, the sheet was heated at 140°C for 5 minutes in an infrared oven, cooled, and then peeled off. The printing ink and adhesive were peeled off along with the sheet, and a "leaf" pattern was penetrantly printed on the surface of the tips.

There was no need for washing.

Example 3 10 parts of Sumiplast Tread 3BL pigment (manufactured by Sumitomo Chemical Co., Ltd.), 15 parts of ethyl cellulose, 2 parts of vaseline, 10 parts of toluene, and 15 parts of butanol.

Using an ink made by mixing 50 parts of cyclohexanone, a "flower pattern" was printed in a circular pattern on the surface of an adhesive sheet, 30 micron thick Diamid film #2000 (Nylon 12 film manufactured by Daicel Chemical Co., Ltd.). I made a print sheet.

Then place the printing sheet on a polypropylene plate,
The mixture was passed through an infrared heating furnace at 140° C. for 5 minutes. Diaamide film softens at 100°C, so the printed sheet softens when heated and sag under its own weight, so it is heated while being in close contact with the skin surface. When the sheet was peeled off after cooling, the printed film adhered to the sheet and was removed, leaving a ring-shaped "flower pattern" penetratingly printed on the quadratic curved surface around the plate, and there was no need to wash it.

Example 4 Adhesive ink was prepared by mixing 28 parts of Sumikalon Red R dye (manufactured by Sumitomo Chemical Co., Ltd.), 70 parts of silicone adhesive YR3340 (manufactured by Kyusoku Silicon Co., Ltd.), and 2 parts of phenol. 20% polyvinyl alcohol (PVA) on the entire surface of the polyethylene terephthalate film
A base sheet was prepared by applying a related solution, and a printed sheet was prepared by printing a circular ring trademark on the PVA surface of the sheet. Next, cut out the trademark part from this sheet and place it in a saturated steam bath at 30°C for 10 seconds [.

Re-moisten and activate the surface, and attach it to the desired position of the polyethylene terephthalate bottle by Honjo.

The mixture was then heated in a heating furnace at 180° C. for 1 minute.

[When the sheet was peeled off after cooling, the trademark was printed in red on the bottle surface, and there was no need to wash it as there was no foreign matter attached.

As mentioned above, the present invention is a permeation printing method in which an adhesive printing sheet is attached to a printing material and heated, so the printing sheet can be mass-produced and manufactured at low cost, and the attachment of the sheet is extremely easy. It is easy to use, does not require any special mechanical equipment, can be reliably attached to quadratic curved surfaces, and the process is simple as it only needs to be heated after attachment. The membrane peels off and there is no need for cleaning, which not only makes the work safer and more hygienic, but also has the effect of significantly reducing costs.

Patent applicant Akiyuki Akamatsu

Claims (1)

[Claims] A step of adhering an adhesive printing sheet with penetrating ink attached to a base sheet to a substrate, a heating step to infiltrate dyes and pigments in the printing ink into the substrate, and peeling off the printing sheet. Penetration printing method consisting of process.