JP5931249B2 - Method for manufacturing print media - Google Patents

Description

The present invention relates to a method for manufacturing a print medium when printing is performed on a film material for cooking, a conveyor belt, or a building.

  2. Description of the Related Art Conventionally, a technique for printing on a recording medium made of base paper or the like by an inkjet method or the like is known (Patent Document 1). In this Patent Document 1, when coating is performed with a first coating solution containing a hydrophilic binder on one side of a base paper or a second coating solution containing a white raw material, a third coating containing an acid on the other side. It describes a method for manufacturing a recording medium to which a liquid is applied.

  By the way, cooking cook sheets, conveyor belts for transporting foodstuffs, and membrane materials used for construction are generally used at high temperatures or require durability, so fabrics made of glass fiber or aramid fiber. A film material in which a fluororesin layer made of tetrafluoroethylene resin (PTFE) resin or the like is coated on both sides is used. In such a film material, since the fluororesin layer has water repellency, printing, printing, or unevenness may occur when printing by the inkjet method. Printing was not done. However, recently, printing on a film material has been demanded for the purpose of printing advertisements, advertisements, simple display characters, and the like on the film material.

JP 2010-46823 A

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a printing method on a film material that can perform printing without causing bleeding, show-through, or unevenness.

The method for producing a printing medium according to the present invention includes a step of preparing a woven fabric made of glass fiber or heat-resistant fiber and a film material having a fluororesin layer formed on both sides of the woven fabric, water , fluororesin, silica And a step of preparing a surface modification treatment liquid containing a silicone surfactant, and applying the surface modification treatment liquid to the fluororesin layer of the film material, followed by drying and baking to form an ink receiving layer And a step of performing.

  ADVANTAGE OF THE INVENTION According to this invention, the printing method to the film | membrane material which can perform printing without producing bleeding, a back-through, and a nonuniformity can be provided.

1 is a schematic cross-sectional view of a print medium according to the present invention. The characteristic view which shows the relationship between time and color difference ((DELTA) E) in the case of printing an ink on the printing medium under temperature 200 degreeC heating. The characteristic view which shows the relationship between time and a color difference in the case of printing an ink on the printing medium under the temperature of 320 degreeC heating. The characteristic view which shows the relationship between the time and color difference in the case of printing an ink on the printing medium under the temperature of 360 degreeC heating. The characteristic view which shows the relationship between the silica addition rate in the surface modification processing liquid which concerns on this invention, and the adhesion strength of an ink. The characteristic view which shows the relationship between the silica addition rate in the surface modification processing liquid which concerns on this invention, and the surface tension of an ink. The figure which shows the adhesion strength of the ink with respect to the printing medium which concerns on this invention. The characteristic view which shows the relationship between the years of exposure and the color difference in the indoor film | membrane material which printed the ink on the printing medium based on this invention. The characteristic view which shows the relationship between the years of exposure and the color difference in the outdoor film | membrane material which printed the ink on the printing medium based on this invention.

Hereinafter, the printing method on the film material of the present invention will be described in more detail.
FIG. 1 shows a schematic cross-sectional view of a print medium according to the present invention.
The print medium 1 includes a film material 2 and an ink receiving layer 3 formed on one surface of the film material 2. Here, the membrane material 2 is composed of, for example, a woven cloth 4 made of glass fibers according to JISR2016 using long glass fibers, and a fluororesin layer 5 formed on both surfaces of the woven cloth 4. The woven fabric 4 is configured by weaving weft yarns 4a and warp yarns 4b. As the fluororesin layer 5, for example, tetrafluoroethylene resin (PTFE resin) is used. The ink receiving layer 3 is made of ion-exchanged water, tetrafluoroethylene / hexafluoropropylene resin (FEP resin) or tetrafluoroethylene perfluoroalkoxyethylene copolymer resin (PFA resin), silica, silicone surfactant. After applying the surface treatment liquid to which is added, it is formed by drying and baking.

  The woven fabric made of glass fibers may be a plain fabric according to JISR3410, a satin fabric according to JISR3410, or a twill fabric according to JISR3410. Further, heat-resistant fibers such as aramid fibers, carbon fibers, and stainless fibers may be used instead of glass fibers.

In the present invention, the thickness and mass of the membrane material are 0.1 mm to 0.4 mm in thickness and 0.4 kg / m ^{2 to} 1.0 kg / m in thickness, considering the ease of use and workability. by using a ^two, film material forming the PTFE on both surfaces of the woven fabric is preferably in a thickness 0.25Mm～0.5Mm, mass 0.45kg ^{/ m 2} ~1.87kg ^/ m 2 .

  In the present invention, examples of the ink printed on the ink receiving layer include a medium solvent type ink manufactured by Mimaki Engineering Co., Ltd. This medium solvent type ink has a nominal weather resistance (color difference (ΔE) provided by Mimaki Engineering Co., Ltd. = year when exceeding 10) of 3 years. As the ink, in addition to cyan, magenta, and yellow, which are the three primary colors for determining printing ability, red, green, and purple colors can be used.

The surface modification treatment liquid for forming the ink receiving layer includes water (for example, ion exchange water), PFE or FEP resin as a fluororesin, surface untreated silica having a particle size of 20 nm to 30 nm, and silicone-based surface activity. It is preferable that an agent is included. Examples of the additive added to the surface modification treatment liquid include Al ₂ O ₃ (alumina) and potassium titanate whiskers. Here, the firing temperature in the step of forming the ink receiving layer is preferably not less than the melting point of the fluororesin used for the surface modification layer and less than 370 ° C. The reason for this is that if the melting point of the fluororesin used for the surface modification treatment layer is less than the melting point of the surface modification treatment solution, the fluororesin does not melt after drying, and if it exceeds 370 ° C, the fluororesin of the film material may be fired. Because there is.

  In the present invention, when PFA or FEP resin is used for the surface modification treatment liquid, it is preferable to use PTFE resin as the fluororesin used for the film material. This is because the PTFE resin has a higher melting point than the PFA or FEP resin, and the PTFE resin used for the film material is fired when the surface treatment liquid is applied to the film material, dried and then fired to form the ink receiving layer. This is because it can be avoided.

In the present invention, the physical properties necessary for printing on a print medium include the following printing ability and heat resistance.
As the printing capability, it is necessary that there is no problem of deteriorating the printing image quality such as ink breakthrough, bleeding, and unevenness. In order to evaluate the printing ability, the appearance after a printing test on a recording medium was observed.
As for heat resistance, when a top coat is required as post-processing, it is necessary that the color fading is small in the drying / firing process. In order to evaluate the heat resistance, the printing sample was yellow and plotted in an oven at temperatures of 200 ° C., 320 ° C. and 360 ° C. up to 180 seconds, and the relationship between time and color difference (ΔE) was examined. As a color difference measuring method, the hue was measured based on JISK5600 4-4, 4-5, 4-6, and the color difference was calculated by the following formula.
ΔE = (Δa ² + Δb ² + ΔL2) ^1/2 = {(a1−a2) + (b1−b2) + (L
1-L2)} ^1/2 (1)
In the above formula (1),
Δa: Difference in a value immediately after printing and after UV irradiation
Δb: b value difference immediately after printing and after UV irradiation
ΔL: Difference in L value immediately after printing and after UV irradiation
a1: a value of blank immediately after printing, a2: a value after ultraviolet irradiation
b1 = b value of blank immediately after printing, b2: b value after ultraviolet irradiation
L1 = L value of blank immediately after printing, L2: L value after ultraviolet irradiation
As the color difference measuring apparatus, a two-pass optical system color measuring instrument was used.

  Regarding the heat resistance, when the relationship between time and color difference was investigated for each of the medium solvent ink, the low solvent ink, and the UV curable ink, the results shown in FIGS. 2, 3, and 4 were obtained. 2 to 4 show cases where the heating temperatures are 200 ° C., 320 ° C., and 360 ° C., respectively. 2 to 4, reference numeral (a) is a low solvent ink (trade name: MIUBIO manufactured by Muto Kogyo Co., Ltd.), and reference numeral (b) is a UV curable ink (trade name: LF- manufactured by Mikima Engineering). 200), the symbol (c) indicates the case of the medium solvent ink (trade name: SS21 manufactured by Mikima Engineering Co., Ltd.), and all indicate yellow ink. Table 1 below shows the evaluation results of the heat resistance of each ink. In addition, Table 2 below shows printing ability judgment criteria, and Table 3 below shows heat resistance judgment criteria.

As a result, the medium solvent ink did not show through the ink and the image quality was good. The image quality of the low solvent ink deteriorated due to bleeding and unevenness. The UV curable ink had the best image quality, and there was no breakthrough of the ink. In addition, the high solvent ink has many back-throughs, and the image quality is extremely lowered due to bleeding and unevenness.

  From the heat resistance in Table 1 and the printing ability in Table 2, it was confirmed that the medium solvent ink was effective. However, the UV curable ink with the best image quality was extremely poor in heat resistance compared with other inks, and satisfactory results were not obtained. In addition, the color fading condition was such that the color (pigment) had poor heat resistance, and the color fading was such that it burned black.

  In the present invention, since ink is printed on a printing medium, it is preferable that the printing medium has excellent fixability on the surface and the surface tension of the printing medium is large. In order to confirm these characteristics, the relationship between the silica addition rate in the ink receiving layer and the adhesion strength of the ink was examined. FIG. 5 shows the result. The silica addition rate in 100 wt% of the solution in the surface modification treatment liquid was changed as shown in FIG. 5, and an ink fixing test on a printing medium was performed. As a result, it was found that the adhesion strength of the ink peaked when the silica addition rate was 1.6 wt%, and the adhesion strength decreased when it exceeded 3.2 wt%. Furthermore, as a result of investigating the correlation between the amount of silica added and the surface tension of the ink, FIG. 6 was obtained. From FIG. 6, it was confirmed that the surface tension was about 54 mN / M when the silica addition rate was 1.0 wt% or more. 5 and 6, it was confirmed that the silica addition rate is preferably 0.8 wt% or more and 3.2 wt% or less.

  In the present invention, in particular, when printing on a building film material, if the ink is peeled off just by rubbing the ink printed on the printing medium, it is problematic in use, and therefore, one having excellent adhesion is preferable. When the adhesion strength was measured by thermally fusing a PET film on the surface of the UV curable ink, high solvent ink, medium solvent ink, and low solvent ink printed on the printing medium, the results shown in FIG. 7 were obtained. FIG. 7 shows that the UV curable ink (FIG. 7A) is followed by the medium solvent ink (FIG. 7C), the high solvent ink (FIG. 7B), and the low solvent ink (FIG. 7). It was confirmed that the order was (d)). The high solvent ink has a back-through and unevenness, and the low solvent has a bleeding and unevenness, so that the surface area to be peeled is small and the adhesion is low.

In the present invention, in the case of printing on a building membrane material used either outdoors or indoors, it is preferable that the color fading is small (that is, weather resistance is good). Here, the weather resistance test was carried out by conducting an accelerated exposure test using a sunshine weather meter and a xenon weather meter. That is, the outdoor acceleration test is conducted based on the annual ultraviolet light amount: 300 MJ / m, and the indoor accelerated test is conducted based on the ultraviolet light amount of 14.2 MJ / m ² under the fluorescent lamp. The color difference (ΔE value) This was done by confirming the calculation and fading. The color was yellow both indoors and outdoors. Sunshine weatherometers were irradiated with ultraviolet rays for 10 years, and xenon weatherometers were irradiated with ultraviolet rays for 7 years. Moreover, as a color difference measuring method, the hue was measured based on JISK5600, and the color difference was calculated by the above equation (1).

  FIG. 8 is a characteristic diagram showing the results of an accelerated exposure test indoors (use: film material for interior materials) using a sunshine weather meter. In FIG. 8, an accelerated exposure test was performed at an irradiation dose equivalent to 10 years in consideration of the case of using a film material indoors. In FIG. 8, symbol (a) indicates the case of the medium solvent ink, symbol (b) indicates the case of the low solvent ink, and symbol (c) indicates the case of the UV curable ink. From FIG. 8, it was confirmed that when medium solvent ink was used, ΔE = 2.7 was small at an irradiation amount corresponding to 10 years, and that it had sufficient capacity for indoor use.

  FIG. 9 is a characteristic diagram showing a result of an accelerated exposure test on an outdoor film material using a xenon weatherometer. From FIG. 9, it was confirmed that the hue deterioration (ΔE value) increased with the years of exposure, and the medium solvent ink (trade name: SS21 manufactured by Mimaki Engineering Co., Ltd.) became thinner. Further, from FIG. 9, ΔE = 10 was exceeded in 5 years later than the manufacturer's nominal tolerance, and it was confirmed that the printing medium according to the present invention contributed to the improvement of weather resistance.

Next, a printing method on a film material according to an embodiment of the present invention will be described with reference to FIG. Note that the present embodiment is not limited to the following description.
(Example)
[Membrane material]
The following materials were used as the film material. First, Nitto Boseki Co., Ltd. thickness 0.25Mm～0.31Mm, Mass 300g ^/ m 2 ~315g ^/ glass fiber plain weave fabric of ^{m 2} Mitsui Dupont Fluorochemicals Co. PTFE dispersion solid concentration 40 wt% Was applied twice, the solid content concentration was 30 wt% twice, and the solid content concentration was 20 wt% once, for a total of 5 coatings. Subsequently, after drying at 100 ° C. to 200 ° C., baking is performed at 360 ° C. or more, the mass of the PTFE resin layer is 100 g / m ^{2 to} 300 g / m ² , the thickness is 0.09 mm to 0.11 mm, and the mass of the film material is 400 g. / ^{m 2} ~600g / ^m 2, was produced film material 2 having a thickness of 0.34Mm～0.36Mm.

[Surface modification solution]
As the surface modification treatment liquid, 4.8 wt% of FEP resin, 3.2 wt% of silica having a particle diameter of 20 to 30 nm, 91.76 wt% of ion-exchanged water, and 0.24 wt% of a silicone-based surfactant were used.
[Formation of ink receiving layer]
One surface of the film material 2 was coated with the surface modification treatment solution by an impregnation method, dried at 100 ° C. to 250 ° C., and then baked at 320 ° C. to form the ink receiving layer 3.

[Inkjet printing method]
For printing, a wide format inkjet printer (trade name: JV33260) manufactured by Mimaki Engineering was used. The ink was a yellow medium solvent ink (trade name: SS21) manufactured by MIMAKI ENGINEERING with a nominal weather resistance of 3 years. Specifically, this ink includes a glycol ether solvent (content: 70% to 80%), a lactone solvent (content: 10% to 20%), and a low-boiling aromatic naphtha (content: 0.1). % To 5.0%), 1,3,5-trimethylbenzene (content: 0.1% to 1.0%), 1,2,4-trimethylbenzene (content: 0.1% to 1.%). 0%), isopropylbenzene (content: 0.01% to 0.1%), nickel compound (1.0% to 5.0%), vinyl resin as a binder (content: 0.1% to 0.1%) 1.0%), and the surface tension is 30 mN / M.

  Further, in order to print clearly on a print medium, the printer head was an on-demand piezo head with 180 nozzles × 8 rows as a barrier dot printing method, and the printing mode was 720 dpi × 1440 dpi, 24 pass.

  According to the above embodiment, as the surface modification treatment liquid, the thermoplastic resin (FEP resin) that can be melted in the PTFE resin layer is used as a binder to fix silica to the surface of the printing medium. Changes, and printing can be performed on the film material without causing bleeding, back-through or unevenness.

Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.
The invention described in the original claims is appended below.
[1]
Preparing a woven fabric made of glass fiber or heat-resistant fiber and a film material having a fluororesin layer formed on both sides of the woven fabric;
A step of preparing a surface modification treatment liquid in which a fluororesin, silica, and a silicone-based surfactant are added to water;
Applying the surface modification treatment liquid to the fluororesin layer of the film material, then drying and baking to form an ink receiving layer;
Printing with ink on the ink receiving layer;
A method of printing on a film material, comprising:
[2]
The method for printing on a film material according to [1], wherein the fluororesin used for the film material is PTFE resin, and the fluororesin used for the surface modification treatment liquid is PFA or FEP resin.
[3]
The film material according to [1] or [2], wherein a baking temperature in the step of forming the ink receiving layer is not less than the melting point of the fluororesin used in the surface modification treatment liquid and less than 370 ° C. Printing method.

  DESCRIPTION OF SYMBOLS 1 ... Printing medium, 2 ... Membrane material, 3 ... Ink receiving layer, 4 ... Woven cloth, 4a ... Weft, 4b ... Warp, 5 ... PTFE resin layer.

Claims (3)

Preparing a woven fabric made of glass fiber or heat-resistant fiber and a film material having a fluororesin layer formed on both sides of the woven fabric;
Preparing a surface modification treatment liquid containing water , fluororesin, silica, and silicone surfactant;
After applying the surface modifying treatment liquid fluorocarbon resin layer of the film material and dried, a step of firing to form an ink-receiving layer
A method for producing a print medium , comprising: 2. The method for producing a print medium according to claim 1, wherein the fluororesin used for the film material is PTFE resin, and the fluororesin used for the surface modification treatment liquid is PFA or FEP resin. 3. The method for producing a print medium according to claim 1, wherein a baking temperature in the step of forming the ink receiving layer is not less than a melting point of a fluororesin used in the surface modification treatment liquid and less than 370 ° C. 3. .