JP2013192557A - Pretreatment liquid for inkjet printing and printing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which various measures for improving affinity must be taken to form an inkjet print image on a hydrophobic food, an oily food, a soap or a wax product using a water-based edible ink.SOLUTION: A pretreatment liquid is applied to a hydrophobic food, an oily food, a soap or a wax product prior to printing. According to this, a water-based edible ink is never bled or repelled, the drying characteristics of the water-based edible ink can be improved, and a gloss can be given to the ink.

Description

Detailed Description of the Invention

The present invention provides a method for applying a pretreatment liquid to the surface of a printing material to enable direct inkjet printing of an image using a water-based edible ink on the surface of a hydrophobic food, oily food, soap, wax product, or the like. The present invention relates to a treatment liquid, a printing method using the pretreatment liquid, foods, soaps and wax products printed using the pretreatment liquid.

Traditionally, foods such as bread and rice crackers with hydrophilic surfaces have been directly ink-jet printed with water-based edible inks, while hydrophobic foods, oily foods, soaps, wax products are on the surface. Since the ink was repelled, a clear printed image could not be obtained.

The following method is disclosed as a method for solving this problem.

There has been disclosed a method of directly printing on an unprocessed printing material without requiring a pretreatment such as providing an ink receiving layer on a printing surface by including a lot of emulsifiers and a viscosity modifier in the ink. (Patent Document 1)

There has been disclosed a technique that enables direct printing with a general water-based edible ink by heating the food surface before printing and improving the wettability of the chocolate surface, which is an oil-based food. (Patent Document 2)

By applying an oil-based overcoat on a printed image of chocolate, which is an oil-based food product, and cooling and curing it, it is possible to provide a texture that is consistent with adhesion strength, gloss, scratch resistance, and oil-based substrates. Is disclosed. (Patent Document 3)

Various general ink receiving layers for printing on paper and film have been disclosed. An ink jet receiving agent containing a combination of a cationic polyurethane resin containing a zirconium compound, polyvinyl alcohol, a water-soluble polyvalent metal salt, and an aqueous medium. By forming an ink receiving layer, it has excellent ink absorbability and a printed image. A technique that enables printing without causing bleeding or cracks is disclosed. (Patent Document 4)

A coating agent containing at least one of a binder, a food white pigment, a saccharide, or a mixture thereof, applied to milk chocolate, dark chocolate, or white chocolate, allowing direct printing with common aqueous edible inks. A technique is disclosed. (Patent Document 5)
Japanese Patent Publication No. 2008-169293 Japanese Patent Publication No. 2010-29064 Japanese Patent Publication No. 2009-95 Japanese Patent Publication No. 2011-42046 Japanese Patent Publication No. 2004-518431

In Patent Document 1, in order to obtain an image in which ink does not bleed without pretreatment, a large amount of emulsifier content of 1 to 10% is required in the ink, and the emulsifier contained in a general aqueous edible ink is Since it was 0.01 to 1%, it was not possible to use an inexpensive market ink. In addition, since white cannot be formed on the background, printing is limited to printing on a white or light-colored printing material.

In Patent Document 2, when the chocolate is heated too much, a bloom phenomenon occurs in which the powder is whitened and powdered, resulting in a defective product or a loss of gloss. And expensive heating equipment was also needed.

In Patent Document 3, it is necessary to process a certain proportion of fine irregularities on the surface of the oily base layer. Further, when printing on the surface of the oily base layer, the ink was repelled, and when dried, the color became light and the printing quality was poor. Post-processing was also necessary.

The ink receiving layer of the recording material, such as Patent Document 4, contained a component not approved by the Food Sanitation Law. It could not be used as a pretreatment liquid for direct printing on food.

In Patent Document 5, the coating work of the coating agent is required at least twice. It was necessary to apply the surfactant for the first time and then apply the coating agent for the ink receiving layer. Furthermore, the second coating also had to wait for the first coating agent to dry.

The present invention provides a pretreatment liquid for inkjet printing comprising a water-soluble natural polysaccharide, a food emulsifier, water, and alcohol.

The present invention also provides the pretreatment liquid as described above, wherein the water-soluble natural polysaccharide is a cellulose derivative.

In the pretreatment liquid, the total amount of water and alcohol in the pretreatment liquid is 1 to 50 parts by weight of hydroxypropyl methylcellulose and / or hydroxypropylcellulose, and 0.5 to 20 emulsifiers for food. A pretreatment liquid mixed with parts by weight is provided.

Moreover, this invention provides the pretreatment liquid for foodstuffs characterized by including titanium dioxide.

Moreover, this invention provides 5-20 weight% of titanium dioxide in the pretreatment liquid of the said description, and provides the pretreatment liquid for foodstuffs characterized by the above-mentioned.

In addition, the present invention prints with water-based edible ink on hydrophobic foods, oily foods, soaps, wax products coated with a pretreatment liquid for inkjet printing containing water-soluble natural polysaccharides and food emulsifiers, water and alcohol. Provide a method.

The present invention also provides a hydrophobic food, oily food, soap, wax coated with an aqueous edible ink by applying a pretreatment liquid for inkjet printing containing a water-soluble natural polysaccharide and a food emulsifier, water and alcohol. Providing products.

According to the present invention, the action of the first problem-solving means is to improve the wettability of the printed surface by applying a pretreatment liquid containing a water-soluble natural polysaccharide and a food emulsifier to the water-based edible. There is no bleeding and repelling of the ink, and it is possible to improve the drying property and glossiness of the image printed with the water-based edible ink. Inclusion of the alcohol improves the drying property of the pretreatment liquid application surface and reduces the amount of bounce when it adheres to the food.

The action of the second problem solving means is that it is a cellulose derivative as a water-soluble natural polysaccharide, effectively improving the wettability of the printed surface, eliminating bleeding and repelling of the printed ink, and drying of the ink. And the advantage that glossiness is also improved is obtained.

The action of the third means for solving the problem is that among the cellulose derivatives, hydroxypropylmethylcellulose and / or hydroxypropylcellulose is employed, and the total amount of water and alcohol is 100 parts by weight with respect to hydroxypropylmethylcellulose and / or hydroxypropylcellulose. By mixing 1 to 50 parts by weight and 0.5 to 20 parts by weight of a food emulsifier, the wettability of the printed surface is effectively improved, bleeding and repelling of the printed ink is eliminated, and the drying property and gloss of the ink are eliminated. In addition to the advantage of improving the properties, the adhesion between the printing material and the pretreatment liquid can be improved.

The action of the fourth problem solving means is that a white pretreatment liquid is formed by adding titanium dioxide to the pretreatment liquid. By applying a white pretreatment liquid, even if it is a dark color printing material, a white layer can be formed with the pretreatment liquid. Printing on the material is now possible.

The action of the fifth problem solving means is effective to contain 5 to 20% by weight of titanium dioxide in order to obtain the action of the fourth problem solving means, and a sufficient white color can be obtained.

By applying the pretreatment liquid, an ink receiving layer is formed on the printing surface of the printing material. The thickness of the ink receiving layer is preferably 5 to 300 μm, more preferably 30 to 100 μm, and particularly preferably 30 to 80 μm. This range is preferable from the viewpoint of ink absorbability of the ink receiving layer. If the thickness of the receiving layer is too thin, the ink will be repelled. If the receiving layer is too thick, the texture will change.

When the ink-receiving layer is formed within the coating thickness range of the pretreatment liquid, the amount of titanium dioxide added is 3 to 40 parts per 100 parts by weight in order to obtain a sufficient white density as a printed image background. It is preferable that it is a weight part, More preferably, it is 5-20 weight part. If the amount of titanium dioxide added is too small, the underlying color cannot be concealed, so the white density of the pretreatment liquid is low, and the print quality deteriorates. If the amount is too large, the viscosity becomes high, and the suitability of spray coating is deteriorated and the texture is affected.

Water-soluble natural polysaccharides quickly absorb moisture contained in water-based edible inks, help to eliminate ink bleeding and repelling, and provide friction resistance that does not easily fall off when touched by a fingertip.

Examples of water-soluble natural polysaccharides include biogum, guar gum derivatives, and cellulose derivatives. Biogum includes xanthan gum, diyutan gum, gellan gum and the like. Guar gum derivatives include guar gum, hydroxypropyl guar gum, cationized guar gum and the like. Cellulose derivatives include methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, carboxyethylcellulose and the like. Other examples include dextran and dextrin.

The addition amount of the water-soluble natural polysaccharide is preferably 1 to 50 parts by weight, more preferably 2 to 20 parts by weight with respect to 100 parts by weight of the total of alcohol and water.

Food emulsifiers must be included. If the pretreatment liquid is applied without containing a food emulsifier, the pretreatment liquid is repelled. As a countermeasure, there is a means to increase the content of water-soluble natural polysaccharides and increase the viscosity, but when this means is adopted, the pretreatment agent can be applied without being repelled, but when the pretreatment liquid is dried, the printing material Because it has the problem of peeling off in the form of a film, it cannot be adopted. If the amount added is too small, it will be repelled if the pretreatment liquid is applied to the printing material. When there is too much addition amount, the drying property of a pretreatment liquid will fall.

As food emulsifiers, glycerin fatty acid ester, glycerin organic acid fatty acid ester, polyglycerin fatty acid ester, sucrose fatty acid ester, sorbitan fatty acid ester, propylene glycol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, lecithin, stearoyl calcium lactate, etc. are used. I can do things.

The amount of the food emulsifier added is preferably 0.5 to 20 parts by weight, more preferably 1 to 10 parts by weight with respect to 100 parts by weight of the total of alcohol and water.

As the alcohol, ethanol and methanol can be used.

A preferable mixing ratio of alcohol and water is in the range of 90:10 to 40:60, more preferably in the range of 70:30 to 40:60. When the ratio of alcohol is high, the water-soluble polysaccharide is difficult to dissolve, so workability is deteriorated. When the ratio of water is high, the drying property of the pretreatment liquid application surface is lowered and the wettability is hardly improved.

Even in the case of white or light-colored foods, a pretreatment liquid containing titanium dioxide may be applied to improve ink bleeding and repelling.

By modifying the surface of the material to be printed on which the pretreatment liquid is applied, it is possible to reduce the repelling of the pretreatment liquid and improve the fixability. When the surface is modified, the weight ratio of hydroxypropylmethylcellulose and / or hydroxypropylcellulose to the alcohol preparation can be 3: 100 or less. Surface modification methods include plasma treatment, corona treatment, flame treatment, and heat treatment.

In addition to the dip coating method, the pretreatment liquid can employ many coating methods such as spray coating, spin coating, roll coating, and flow coating.

The pretreatment liquid tends to be repelled when the room temperature is low. Since it becomes easy to play when the room temperature is low, an environment where the room temperature is 20 ° C. or higher is suitable.

EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further more concretely, this invention is not limited to these.

Example 1 10 parts by weight of hydroxypropyl methylcellulose (Metros SE-06 manufactured by Shin-Etsu Chemical Co., Ltd.), 100 parts by weight of an alcohol preparation (32.9 parts by weight of Alpet E purified water, 67.1 parts by weight of ethanol) 2 parts by weight of glycerin fatty acid ester (Mitsubishi Chemical Foods O-50D) was stirred and mixed at room temperature for 1 hour to obtain a solution-like pretreatment liquid. This pretreatment liquid is subjected to dip coating on white chocolate “Fancy Bonbon” (trademark, manufactured by Taniguchi).

Example 2 2 parts by weight of hydroxypropylmethylcellulose (previously described), 100 parts by weight of an alcohol preparation (previously described), and 2 parts by weight of a glycerin fatty acid ester (previously described) were stirred and mixed at room temperature for 1 hour to prepare a solution-like pretreatment A liquid was obtained. This pretreatment liquid is subjected to dip coating on white chocolate “fancy bonbon” (described above).

Example 3 5 parts by weight of hydroxypropylmethylcellulose (previously described), 100 parts by weight of an alcohol preparation (previously described), and 2 parts by weight of glycerin fatty acid ester (previously described) were stirred and mixed at room temperature for 1 hour to prepare a solution-like pretreatment A liquid was obtained. This pretreatment liquid is subjected to dip coating on white chocolate “fancy bonbon” (described above).

Example 4 2 parts by weight of hydroxypropylmethylcellulose (previously described), 100 parts by weight of an alcohol preparation (previously described), and 4 parts by weight of a glycerin fatty acid ester (previously described) were stirred and mixed at room temperature for 1 hour to prepare a solution-like pretreatment A liquid was obtained. This pretreatment liquid is subjected to dip coating on white chocolate “fancy bonbon” (described above).

Example 5 2 parts by weight of hydroxypropylmethylcellulose (previously described), 100 parts by weight of alcohol preparation (previously described), 4 parts by weight of sucrose fatty acid ester (ER-290 manufactured by Mitsubishi Chemical Foods), and stirred for 1 hour at room temperature As a result, a solution-like pretreatment liquid was obtained. This pretreatment liquid is subjected to dip coating on white chocolate “fancy bonbon” (described above).

Example 6 2 parts by weight of hydroxypropylmethylcellulose (previously described), 100 parts by weight of alcohol preparation, 2 parts by weight of glycerin fatty acid ester (previously described), 2 parts by weight of sucrose fatty acid ester (previously described), sorbitan fatty acid ester (manufactured by Kao) 2 parts by weight of Emazole O-120V) was mixed with stirring at room temperature for 1 hour to obtain a solution-like pretreatment liquid. This pretreatment liquid is subjected to dip coating on white chocolate “fancy bonbon” (described above).

Example 7 2 parts by weight of hydroxypropyl methylcellulose (previously described), 100 parts by weight of alcohol preparation (previously described), 10 parts by weight of sorbitan fatty acid ester (previously described), 5 parts by weight of silicon dioxide (Silopage 760 manufactured by Fuji Silysia Chemical) Were stirred and mixed at room temperature for 1 hour to obtain a solution-like pretreatment liquid. This pretreatment liquid is subjected to dip coating on white chocolate “fancy bonbon” (described above).

Example 8 3.5 parts by weight of hydroxypropylmethylcellulose (previously described), 100 parts by weight of an alcohol preparation (previously described), and 2 parts by weight of glycerin fatty acid ester (previously described) were stirred and mixed at room temperature for 1 hour. A pretreatment liquid was obtained. This pretreatment liquid is subjected to dip coating on white chocolate “fancy bonbon” (described above).

Example 9 0.2 parts by weight of sodium carboxymethylcellulose (Nippon Paper Chemicals Sunrose SLD-FM) and 10 parts by weight of purified water were stirred and mixed for 1 hour. After mixing, 30 parts by weight of an alcohol preparation (described above) and glycerin were mixed. 1 part by weight of fatty acid ester (described above) was stirred and mixed at room temperature for 1 hour to obtain a solution-like pretreatment liquid. This pretreatment liquid is subjected to dip coating on white chocolate “fancy bonbon” (described above).

Example 10 5 parts by weight of hydroxypropylcellulose (Cernie SL manufactured by Nippon Soda), 100 parts by weight of an alcohol preparation (previously described), 2 parts by weight of glycerin fatty acid ester (previously described) are stirred and mixed at room temperature for 1 hour to obtain a solution. A pretreatment liquid was obtained. This pretreatment liquid is subjected to a dip coating method on white chocolate “fancy bonbon” (described above).

Example 11 1 part by weight of xanthan gum (wood for living) and 10 parts by weight of purified water were stirred and mixed for 1 hour. After mixing, 70 parts by weight of an alcohol preparation (previously described) and 1 part by weight of a glycerin fatty acid ester (previously described) Were stirred and mixed at room temperature for 1 hour to obtain a solution-like pretreatment liquid. This pretreatment liquid is subjected to dip coating on white chocolate “fancy bonbon” (described above).

Example 12 5 parts by weight of hydroxypropylmethylcellulose (previously described), 100 parts by weight of an alcohol preparation (previously described), 2 parts by weight of polyglycerin fatty acid ester (Sunsoft A-121E manufactured by Taiyo Kagaku), and stirring at room temperature for 1 hour By mixing, a solution-like pretreatment liquid was obtained. This pretreatment liquid is subjected to dip coating on white chocolate “fancy bonbon” (described above).

Example 13 2 parts by weight of dextrin (manufactured by Nippon Garlic, indigestible dextrin) and 10 parts by weight of purified water were stirred and mixed for 1 hour. After mixing, 2 parts by weight of an alcohol preparation (above) and glycerin fatty acid ester (above) were added. 0.5 parts by weight was stirred and mixed at room temperature for 1 hour to obtain a solution-like pretreatment liquid. This pretreatment liquid is subjected to dip coating on white chocolate “fancy bonbon” (described above).

Example 14 5 parts by weight of hydroxypropylmethylcellulose (described above) and 42 parts by weight of purified water were stirred and mixed for 1 hour. After mixing, 58 parts by weight of methanol (industrial alcohol manufactured by Risa Nanishi Shoten Co., Ltd.), glycerin fatty acid ester ( 2 parts by weight of the above) was stirred and mixed at room temperature for 1 hour to obtain a solution-like pretreatment liquid. This pretreatment liquid is subjected to dip coating on white chocolate “fancy bonbon” (described above).

Example 15 5 parts by weight of hydroxypropylmethylcellulose (previously described), 100 parts by weight of alcohol preparation (42 parts by weight of Alpet ES purified water, 58 parts by weight of ethanol), and 2 parts by weight of glycerin fatty acid ester (previously described) Were stirred and mixed at room temperature for 1 hour to obtain a solution-like pretreatment liquid. This pretreatment liquid is subjected to dip coating on white chocolate “fancy bonbon” (described above).

Example 16 5 parts by weight of hydroxypropyl methylcellulose (previously described), 100 parts by weight of an alcohol preparation (50 parts by weight Alpet NV purified water, 50 parts by weight of ethanol), and 2 parts by weight of glycerin fatty acid ester (previously described) Were stirred and mixed at room temperature for 1 hour to obtain a solution-like pretreatment liquid. This pretreatment liquid is subjected to dip coating on white chocolate “fancy bonbon” (described above).

Example 17 5 parts by weight of hydroxypropylmethylcellulose (previously described), 100 parts by weight of an alcohol preparation (33 parts by weight Alpet E purified water, 67 parts by weight of ethanol), and 2 parts by weight of glycerin fatty acid ester (previously described) Were stirred and mixed at room temperature for 1 hour to obtain a solution-like pretreatment liquid. 5% by weight of titanium dioxide was added to this pretreatment liquid and stirred for 5 minutes to obtain a solution-like white pretreatment liquid. This pretreatment liquid is subjected to dip coating on “milk chocolate (trademark, manufactured by Meiji Co., Ltd.).

Example 18 5 parts by weight of hydroxypropylmethylcellulose (previously described), 100 parts by weight of an alcohol preparation (previously described), and 2 parts by weight of a glycerin fatty acid ester (previously described) were stirred and mixed at room temperature for 1 hour, followed by solution pretreatment A liquid was obtained. 10% by weight of titanium dioxide was added to this pretreatment liquid and stirred for 5 minutes to obtain a solution-like white pretreatment liquid. This pretreatment liquid is subjected to dip coating on “milk chocolate” (trademark, manufactured by Meiji Co., Ltd.).

About the white chocolate manufactured by the Example and the comparative example, the following items were evaluated and the result was shown in Table 1.

The obtained white chocolate or milk chocolate was placed on a flat bed type inkjet printer “NF-4400E” (trademark, Piezo print head manufactured by Sanryu Co., Ltd.), and a dye-based aqueous edible synthetic dye ink “TESSERA-FC” (trademark, Toyo) A predetermined pattern was recorded by the following standard and evaluated according to the following criteria.

1-1. Pretreatment liquid The fixing pretreatment liquid was applied to chocolate, and it was visually evaluated whether the pretreatment liquid would be repelled by the wettability of the chocolate surface.
○: There is no repelling of the pretreatment liquid, and the level is good.
Δ: Although there is some repelling of the pretreatment liquid, there is no practical problem.
X: There is a repelling of the pretreatment liquid, and the level is not practical.

1-2. Pretreatment liquid Drying The pretreatment liquid was applied to chocolate and rubbed with a finger 10 minutes later, and the drying property was evaluated according to the following criteria.
◯: Even when lightly touched with a finger, the pretreatment liquid hardly adheres to the finger and is at a good level.
Δ: When the finger is lightly touched, the pretreatment liquid slightly adheres to the finger, but after 20 minutes it hardly adheres to the finger, and there is no practical problem.
X: The pretreatment liquid is completely applied to the finger when lightly touched with the finger, and is applied to the finger even after 20 minutes, which is a level that cannot withstand practical use.

2-1. Ink color Solid color images of C100%, M100%, Y100%, K100% are printed. The ink density of the printed image was visually evaluated.
○: The density of the printed ink is high and is at a good level.
(Triangle | delta): Although the density of the printed ink is a little low, it is a level which is satisfactory practically.
X: The density of the printed ink is low and the level is not practical.

2-2. Ink smear C100%, M100%, Y100%, K100% solid images are printed. The ink bleeding was visually evaluated at the contact portion of the printed solid image.
◯: There is no ink bleed and the level is good.
Δ: There is a slight ink bleed, but there is no practical problem.
X: There is ink bleeding and the level is not practical.

2-3. Ink dryness 10 minutes after printing, the surface was rubbed with a finger, and the dryness was evaluated according to the following criteria.
◯: Even when lightly touched with a finger, the printing surface hardly extends, the ink absorption speed is fast, and it is a good level.
Δ: When touched lightly with a finger, the printed surface slightly extends and the ink absorption speed is slightly slow, but at a level that does not cause any problems in practice.
X: When touched lightly with a finger, the printing surface is extended, the ink absorption speed is slow, and it is at a level unbearable for practical use.

As is clear from the above results, the pretreatment liquid is hydroxypropylmethylcellulose and / or hydroxypropylcellulose and an alcohol preparation, and the weight ratio is 3.5: 100 to 10: 100, and the glycerol fatty acid ester is 0.4 to The presence of 4% by weight provides a food having high fixability, drying property, and printability.

The white chocolate produced in the following examples was evaluated, and the results are shown in Table 2.

Example 1 5 parts by weight of hydroxypropylmethylcellulose (previously described), 100 parts by weight of an alcohol preparation (previously described), and 2 parts by weight of glycerin fatty acid ester (previously described) were stirred and mixed at room temperature for 1 hour to prepare a solution-like pretreatment A liquid was obtained. This pretreatment liquid is subjected to dip coating on white chocolate “fancy bonbon” (described above).

The obtained white chocolate is placed on a flat bed type ink jet printer “NF-4400E” (described above), and a predetermined pattern is printed with a dye-based water-based edible natural color ink “TESSERA-MKII” (trademark, manufactured by Toyo Adre) and evaluated. did.

As is clear from the above results, a food having high fixability, drying property, and printability can be obtained by using not only the aqueous edible synthetic dye ink but also the aqueous edible natural dye ink as the pretreatment liquid.

Example 1 5 parts by weight of hydroxypropylmethylcellulose (previously described), 100 parts by weight of an alcohol preparation (previously described), and 2 parts by weight of glycerin fatty acid ester (previously described) were stirred and mixed at room temperature for 1 hour to prepare a solution-like pretreatment A liquid was obtained. This pretreatment liquid is spray-coated on white chocolate “Fancy Bonbon” (described above) with a spray gun “LPH-50” (trademark, manufactured by Anest Iwata Co., Ltd.).

The obtained white chocolate was placed on a flat bed type ink jet printer “NF-4400E” (described above), and a predetermined pattern was printed and evaluated with a dye-based aqueous edible natural pigment ink “TESSERA-MKII” (described above).

As is clear from the above results, the pretreatment liquid can be obtained not only by the dip coating method but also by the spray coating method, so that a food having high fixability, drying property and printability can be obtained.

The pretreatment liquid produced in the following examples was coated on other than chocolate, and the results of evaluation are shown in Table 3.

Example 1 5 parts by weight of hydroxypropylmethylcellulose (previously described), 100 parts by weight of an alcohol preparation (previously described), and 2 parts by weight of glycerin fatty acid ester (previously described) were stirred and mixed at room temperature for 1 hour to prepare a solution-like pretreatment A liquid was obtained. This pretreatment liquid is subjected to dip coating on butter, cheese, granulated gum, apples, tangerines, candles and soap.

The obtained white chocolate was placed on a flat bed type ink jet printer “NF-4400E” (described above), and a predetermined pattern was printed and evaluated with a dye-based aqueous edible synthetic dye ink “TESSERA-FC” (described above).

As is clear from the above results, a food with high fixability, drying property, and printability can be obtained in the same way as the pretreatment liquid other than chocolate.

Claims (8)

A pretreatment liquid for ink jet printing containing a water-soluble natural polysaccharide, a food emulsifier, water, and alcohol. The pretreatment liquid according to claim 1, wherein the water-soluble natural polysaccharide is a cellulose derivative. The pretreatment liquid according to claim 1, wherein hydroxypropylmethylcellulose and / or hydroxypropylcellulose is contained as the cellulose derivative. 1 to 50 parts by weight of hydroxypropyl methylcellulose and / or hydroxypropylcellulose and 0.5 to 20 parts by weight of an emulsifier for food are added to 100 parts by weight of water and alcohol. The pretreatment liquid according to claim 1. Titanium dioxide is contained, The pretreatment liquid according to claims 1 to 4. The pretreatment liquid according to claim 1, wherein the content of titanium dioxide is 5 to 20% by weight. A method of printing with hydrophobic edible ink on hydrophobic foods, oily foods, soaps, wax products coated with a pretreatment liquid for inkjet printing containing water-soluble natural polysaccharides, food emulsifiers, water and alcohol. Hydrophobic foods, oily foods, soaps, wax products printed with water-based edible inks after applying a pretreatment liquid for inkjet printing containing water-soluble natural polysaccharides, food emulsifiers, water and alcohol.