JP4473781B2 - Fabric for advertising medium and advertising medium using the same - Google Patents

Description

  The present invention relates to an advertisement medium cloth that is optimal as an advertisement medium on which an image is formed using an ultraviolet curable ink by an inkjet method, and an advertisement medium using the same.

  In recent years, it has become possible to see prints of symbols printed on fabrics using an ink-jet method as outdoor advertisements and exhibits such as signs for announcements of movies and events, and product advertising signs. As ink used when creating prints for such outdoor advertisements and exhibitions by the inkjet method, dye-based ink is often used because of its ease of handling, but in that case, There have been problems that the manufacturing process has to be complicated, such as coloring and washing after printing, and the water resistance of the printed matter is low.

  Therefore, in order to solve such a problem, it is effective to use an ultraviolet curable ink as the ink. It should be noted that the use of UV curable ink as the ink greatly simplifies the manufacturing process and makes it suitable for the advertising industry that requires quick delivery.

  However, as disclosed in Patent Document 1, the ultraviolet curable ink recording medium is usually synthetic resin, metal, glass, ceramic, etc. Among these, synthetic resin is considered to be usable as an advertising medium. However, when a thin and soft material such as a film is used as an advertising medium, there is a possibility that there is a problem with the tensile strength of the printed material, and a relatively thick and hard material such as an acrylic board is used. In some cases, there is a possibility that the workability may be problematic, and in any case, it is not suitable as an advertising medium. Also, when a pattern is printed on the cloth with ultraviolet curable ink, the ink does not stay on the cloth surface but penetrates into the interior, and sufficient ultraviolet rays are not irradiated to the penetrated ink, which may cause curing failure. It cannot be said that it is suitable as a recording medium for ultraviolet curable ink.

  Therefore, the present condition is that the optimal material as an advertising medium using ultraviolet curable ink has not been developed yet.

JP 2000-037943 A

  An object of the present invention has been made in view of these problems. An advertisement medium fabric that is optimal as an advertisement medium on which an image is formed using an ultraviolet curable ink by an inkjet method and an advertisement medium using the same are disclosed. It is to provide.

That is, according to the present invention, an image is formed by using an ultraviolet curable ink by an inkjet method on a film surface of a fabric for advertising media in which a hot melt polyester film having a film thickness of 30 to 80 μm is bonded to at least one surface of the polyester fabric. The ultraviolet curable ink includes a colorant, a reactive monomer, a reactive oligomer, and a photopolymerization initiator, and the reactive monomer and the reactive oligomer are aliphatic acrylates. The present invention relates to an advertising medium in which the functional oligomer is urethane acrylate or polyester acrylate .

  It is preferable that the thickness of the thinnest portion of the hot melt polyester film bonded to the polyester fabric is 5 μm or more.

  The melting point or softening point of the hot melt polyester film is preferably 120 to 150 ° C.

  ADVANTAGE OF THE INVENTION According to this invention, the cloth for advertising media optimal as an advertising medium with which the image was formed using the ultraviolet curable ink by the inkjet system, and an advertising medium using the same can be provided.

  The fabric for advertising media of the present invention is one in which a hot melt polyester film having a film thickness of 30 to 80 μm is bonded to at least one surface of a polyester fabric. By bonding the polyester fabric and the hot melt polyester film, the tensile strength and tear strength can be improved, and the strength required as an advertising medium can be satisfied. In addition, by forming an image on the film surface of the fabric for advertising media of the present invention using an ultraviolet curable ink by an inkjet method, the ink adhesion and the image quality are also excellent, so a high quality advertisement A medium can be provided.

  The polyester fabric used in the present invention is not particularly limited as long as it is a fabric mainly composed of polyester, as long as it is not limited to 100% polyester fabric, and in a range that does not hinder use as an advertising medium. A combination with other fibers such as nylon, polypropylene, rayon, and cotton may be used. The reason for using the polyester fabric is that it is excellent in physical properties such as light resistance, tension, tearing, and shape stability as compared with other materials, and is advantageous in terms of cost.

  The fineness of the polyester fiber is preferably in the range of 50 to 1000 dtex, and more preferably in the range of 100 to 500 dtex. If it is less than 50 dtex, there is a possibility that the strength that can withstand outdoor use may not be maintained, and if it is greater than 1000 dtex, the strength is sufficient, but because of its poor flexibility, wrinkles are likely to occur during film thermocompression processing. Problems arise.

  The thickness of the polyester fabric is preferably 250 to 550 μm in consideration of tensile strength and tear strength.

  The fabric structure is preferably a woven fabric from the viewpoint of high strength in design, and a plain weave is more preferable. This is because the plain weave has a flat fabric surface as compared with other structures, and therefore the adhesion to the hot melt polyester film is improved.

  As for the density of the woven fabric, the density should be finer for the purpose of preventing the film layer from penetrating the fabric too much during thermal bonding with the polyester film or preventing pinholes on the film surface after bonding. The weft is preferably 35 or more / inch.

  Next, the type of the hot melt polyester film used in the present invention is not particularly limited, but it is more preferable to select a film having excellent light resistance, acid resistance, heat resistance and the like.

  For the thickness of the hot melt polyester film, a film having a thickness of 30 to 80 μm is selected. Furthermore, a film thickness of 40-60 micrometers is more preferable. When the film thickness is less than 30 μm, there is a risk that the film surface will not be flat when it is bonded to the polyester fabric, and the film surface may not be flat, and the film thickness is greater than 80 μm. When it is bonded to the polyester fabric, heat may not be transmitted uniformly, resulting in poor adhesion, or wrinkles may remain if the texture is hard and folded.

  The melting point or softening point of the hot melt polyester film is preferably in the range of 120 to 150 ° C. in consideration of the adhesiveness with the polyester fabric and the relationship with the OPP release film described later, and more preferably 120 to 150 ° C. A range of 140 ° C. is more preferable. The melting point described here is obtained by measuring the temperature showing the maximum endothermic peak by DSC (differential scanning calorimeter). Since the melting point exists when the hot melt polyester used is a crystalline resin, it can be measured by this DSC. In the case of an amorphous resin, since an endothermic peak is not detected by DSC, it is measured by the JIS K-7206 Vicat softening temperature test method.

  In the present invention, the hot melt polyester film is bonded to at least one surface of the polyester fabric. Here, at least one side means that when the advertising side is one side, a hot melt polyester film may be bonded to one side of the polyester fabric. When the advertising side is double side, hot melt is applied to both sides of the polyester fabric. A polyester film may be attached.

  About the bonding method, since a hot melt polyester film is used in the present invention, it can be thermocompression bonded. Although a method of bonding the film and the fabric with an adhesive is also conceivable, in that case, if the adhesive is not selected sufficiently, the adhesive may deteriorate during long-term use, and there is a risk of causing poor adhesion or yellowing. There is a problem of cost increase due to the use of an adhesive, and it is considered best to perform thermocompression bonding.

  The method for thermocompression bonding is not particularly limited, and a conventionally known method can be used. However, as a good example, polyester fabric, hot melt polyester film, OPP release film, It is preferable to perform thermocompression bonding in the order of release paper so that pressure is applied to the heat source from the outside. By thermocompression bonding in this manner, sufficient adhesion to the polyester fabric can be easily obtained while maintaining the smoothness of the surface of the hot melt polyester film.

  Here, the OPP release film is usually sold in a state where the OPP release film is usually attached to the hot melt polyester film. However, it is preferable that the OPP release film is thermocompression bonded as it is without being peeled off. Usually, the hot melt polyester film is subjected to thermocompression bonding in a state where it is peeled off from the OPP release film. However, in the present invention, the OPP release film can be obtained by thermocompression bonding with the OPP release film attached. This is because the weak physical adhesion of the hot-melt polyester film prevents the hot-melt film from excessively penetrating the fabric side, and a smoother and more uniform surface can be obtained. The OPP release film used here includes a mirror (mirror surface) type, a matte type, and the like. Regardless of which type is selected, it is preferable that the surface unevenness is in the range of 0 to 5 μm. In addition, as a substitute for the OPP release film, it is also possible to use a paper or film to which a silicone-based or olefin-based release agent is applied.

In addition, the conditions such as pressure and time at the time of thermocompression bonding may be arbitrarily set while observing the surface state and the adhesion state. Preferably, the pressure ranges from ^{2 to 5} kgf / cm ² and the time ranges from 30 to 120 seconds. It is. Furthermore, when using an OPP release film, the temperature at the time of thermocompression bonding is set to a temperature at which the OPP release film is not deformed, specifically, less than 150 ° C.

  Here, the thickness of the thinnest part of the hot melt polyester film bonded to the polyester fabric is preferably 5 μm or more, and more preferably 20 μm or more. This is because if the thickness is less than 5 μm, the unevenness of the polyester fabric surface affects the film surface, which may deteriorate the image quality.

  As described above, the tensile strength and tear strength of the advertising medium fabric of the present invention prepared as described above is 1000 N or more for both warp and weft in consideration of outdoor use. The tear strength is preferably 40 N or more for both warp and weft.

  The advertisement medium fabric of the present invention is used as an advertisement medium by forming an image on a film surface bonded to the fabric using an ultraviolet curable ink by an inkjet method. The advertisement medium fabric of the present invention can be used not only for advertising purposes but also for non-profit purposes, for example, as a banner depicting only landscapes and people, and as a cloth signboard.

  The process will be described below.

  In the present invention, ultraviolet curable ink is used to form an image. Since the resin used for the ultraviolet curable ink has excellent adhesiveness to the polyester resin, the image formed on the advertisement medium fabric of the present invention has a very high strength.

  In addition, the cured film of the UV curable ink itself is a plastic layer, so that not only is it excellent in light resistance and heat resistance, but the ink cured film can also protect the hot melt film layer from light and heat. It can be said to be a printed material that has a protective effect and is more resistant, and is particularly suitable for outdoor advertising.

  In addition, in order to cure the UV curable ink, ultraviolet rays are irradiated to the printed matter with an ultraviolet lamp during or after printing. As a by-product, radiant heat from the ultraviolet lamp is also applied to the printed matter. Will be irradiated. The radiant heat is small enough not to deform the printed material, but the surface of the printed material temporarily improves the wettability of the ink by the radiant heat and improves the adhesion between the ink and the hot melt polyester film. There is also an advantage of doing.

  Furthermore, since a UV curable ink film is formed on a hot melt polyester film that is thermocompression bonded to a polyester fabric, and the film is a colored cured film having a very high light transmittance, an internal illumination type is assumed. In this case, since the light transmitted through the polyester fabric surface is hardly scattered on the hot melt polyester film surface and the ultraviolet curable ink cured film surface, there is also an advantage that a very clear image can be formed.

  As a component of the ultraviolet curable ink to be used, any component containing a colorant such as a pigment, a reactive monomer, a reactive oligomer, and a photopolymerization initiator can be used. In consideration of the light resistance and heat resistance of the cured ink film, the reactive monomer and reactive oligomer used are preferably aliphatic acrylates. In consideration of flexibility and adhesiveness, the reactive oligomer used is preferably urethane acrylate or polyester acrylate.

  The UV curable ink to be used has other components such as a sensitizer, a dispersant, a heat stabilizer, an antioxidant, an antiseptic, an antifoaming agent, as necessary, to promote the initiation reaction of the photopolymerization initiator. It is also possible to add additives such as agents and penetrants.

  In the ultraviolet curable ink, materials to be used are mixed, and the mixture is further dispersed using a dispersing machine such as a roll mill, a ball mill, a colloid mill, a jet mill, or a bead mill, and then filtered.

  In addition, the surface tension of the ultraviolet curable ink is preferably set to 15 to 45 dyne / cm in consideration of good handleability.

  In addition, regarding the type of ink jet method used when forming an image on the advertising medium fabric of the present invention using ultraviolet curable ink, a continuous method such as a charge modulation method, a micro dot method, an ink mist method, a piezo method, a bubble method, etc. Any method such as an on-demand method such as a jet (registered trademark) method or a thermal ink jet method can be adopted. The head used in the ink jet system may be equipped with a heating device, and heated to 25 to 150 ° C. to lower the viscosity and discharged.

  Further, the viscosity at the time of ink ejection is preferably 1 to 100 cps, more preferably 5 to 50 cps in consideration of good operability.

In addition, the application amount per unit area of the ultraviolet curable ink is preferably 50 g / m ² or less in consideration of the adhesiveness to the hot melt polyester film and the flexibility as an advertising medium.

  Next, although an Example is given and this invention is demonstrated, this invention is not necessarily limited to the Example. The evaluation method is shown below.

(1) Flexibility The softness of the advertising media obtained in Examples and Comparative Examples was evaluated by tactile sensation.
○ …… No marks are left even when bent softly.
△ ··············································································································
× · · · Very hard and clearly marked when folded.

(2) Image quality The image quality of the advertising media obtained in the examples and comparative examples was visually evaluated.
○ …… The pattern is expressed in a uniform state.
Δ: Irregular spots are observed in some places.
× …… Many uneven spots are seen.

(3) Adhesiveness Adhesiveness of the advertising media obtained in Examples and Comparative Examples was evaluated by applying a cellophane tape on the cured film side, peeling off with vigor, and checking the state.
○ …… No peeling at all.
X: The film is peeled off from the fabric or the cured film is peeled off from the film.

(4) Tensile strength The tensile strength of the advertising media obtained in Examples and Comparative Examples was measured by the JIS L 1096A strip method.

(5) Tear strength The tear strength of the advertising media obtained in Examples and Comparative Examples was measured by the JIS L 1096A-1 method.

[Example 1]
Hot melt polyester film GM-913 (thickness 50 μm, melting point 126 ° C., OPP release film) on plain woven fabric of 100% polyester (56 warp / inch, weft 51 / inch, thickness 300 μm) scoured and set by a regular method And manufactured by Toyobo Co., Ltd., and after being sufficiently cooled, the OPP release film was peeled off to obtain a fabric for advertising media of the present invention. The thermocompression bonding conditions are as follows.

[Thermo-compression bonding conditions]
I) Thermocompression bonding equipment: Flat press (NAP502T manufactured by Osaka Asahi Co., Ltd.)
B) Temperature: 130 ° C
A) Load pressure: 4 kgf / cm ²
N) Load time: 60 seconds e) Pressure bonding order: heat source-polyester fabric-hot melt polyester film-OPP release film-release paper (EV-130TA-7, manufactured by Lintec Corporation) -pressure

  Next, 5 parts by weight of a reactive oligomer Ebecryl 8807 (aliphatic urethane acrylate, bifunctional, manufactured by Daicel UC Corporation), reactive monomer KAYARAD PEG400DA (polyethylene glycol 400 diacrylate, bifunctional, Nippon Kayaku Co., Ltd.) 88.7 parts by weight, 1 part by weight of the colorant HOSTAPERM PINK E-02 (Quinacridone Red, manufactured by Clariant Japan Co., Ltd.), 0.3% of the dispersant Floren DOPA-33 (manufactured by Kyoeisha Chemical Co., Ltd.) 5 parts by weight and 5 parts by weight of photopolymerization initiator Irgacure 184 (1-hydroxy-cyclohexyl-phenyl-ketone, manufactured by Ciba Specialty Chemicals Co., Ltd.) were dispersed using a bead mill disperser, followed by filtration to remove impurities. Homogeneous magenta UV A reduction ink was prepared.

  The obtained ink was applied to the film surface side of the advertising medium fabric using an ink jet printer to form an image, and the ink was cured with an ultraviolet lamp to obtain the advertising medium of the present invention. Table 1 shows the results of evaluating the obtained advertising media by the above evaluation method.

  The printing conditions and the ultraviolet irradiation conditions are as follows. Further, the viscosity of the ink when heated (60 ° C.) was 14 cps, and the surface tension was 28 dyne / cm.

[Printing conditions]
B) Nozzle diameter: 70 (μm)
B) Applied voltage: 50 (V)
C) Pulse width: 20 (μs)
D) Drive frequency: 1 (kHz)
E) Resolution: 180 (dpi)
F) Heating temperature: 60 (° C)

[UV irradiation conditions]
A) Lamp type: Metal halide lamp i) Voltage: 120W / cm
E) Irradiation time: 1 second e) Irradiation distance: 10 (mm)

  The obtained advertising media were good as shown in Table 1 for each evaluation item. Moreover, when the cross section of the cloth for advertising media before printing ink was confirmed with the electron microscope, the unevenness | corrugation of the surface is less than 0.7 micrometer, and it is the thinnest part of the hot-melt polyester film bonded to the polyester cloth. The thickness was 28 μm. Here, the thickness of the thinnest portion of the hot melt polyester film bonded to the polyester fabric is the average thickness obtained by measuring the thickness of the film at the intersection of the warp and weft of the plain woven fabric at 10 locations. It is.

[Example 2]
Hot melt polyester film GM-400 (thickness 70 μm, melting point 143 ° C., OPP release film) on plain woven fabric (40 warps / inch, 38 wefts / inch, weft 500 μm) 100% polyester scoured and set by a conventional method And manufactured by Toyobo Co., Ltd., and after being sufficiently cooled, the OPP release film was peeled off to obtain a fabric for advertising media of the present invention. The thermocompression bonding conditions are as follows.

[Thermo-compression bonding conditions]
I) Thermocompression bonding equipment: Flat press (NAP502T manufactured by Osaka Asahi Co., Ltd.)
B) Temperature: 145 ° C
A) Load pressure: 4 kgf / cm ²
N) Load time: 60 seconds e) Pressure bonding order: heat source-polyester fabric-hot melt polyester film-OPP release film-release paper (EV-130TA-7, manufactured by Lintec Corporation) -pressure

  Subsequent steps were carried out in the same manner as in the example to obtain the advertising medium of the present invention. Table 1 shows the results of evaluating the obtained advertising media by the above evaluation method.

  The obtained advertisement medium was slightly harder than that of Example 1 in terms of flexibility, but was not at a particularly problematic level in terms of use, and the other evaluation items were also satisfactory. Moreover, when the cross section of the cloth for advertising media before printing ink was confirmed with the electron microscope, the unevenness | corrugation of the surface is less than 0.7 micrometer, and it is the thinnest part of the hot-melt polyester film bonded to the polyester cloth. The thickness was 48 μm.

[Comparative Example 1]
The UV curable ink produced in Example 1 was directly printed on the polyester fabric used in Example 1 and the ultraviolet irradiation conditions were printed in the same manner as in Example 1 and evaluated by the above evaluation method. The results are shown in Table 1.

  As shown in Table 1, the obtained advertising medium had extremely poor image quality and adhesiveness, and was not at a level that could withstand practical use.

[Comparative Example 2]
The ultraviolet curable ink produced in Example 1 was printed on the hot-melt polyester film used in Example 1 (without being bonded to the fabric), and the conditions for printing and ultraviolet irradiation were the same as in Example 1. Table 1 shows the results of evaluating the printed images by the above evaluation method.

  As shown in Table 1, the obtained advertising media had extremely poor tensile strength and tear strength, and were not of a level that could withstand practical use.

Claims (3)

An advertising medium in which an image is formed by using an ultraviolet curable ink by an inkjet method on a film surface of an advertising medium cloth in which a hot melt polyester film having a film thickness of 30 to 80 μm is bonded to at least one surface of the polyester cloth. The ultraviolet curable ink includes a colorant, a reactive monomer, a reactive oligomer, and a photopolymerization initiator, the reactive monomer and the reactive oligomer are aliphatic acrylates, and the reactive oligomer is a urethane acrylate or An advertising medium characterized by being polyester acrylate . The advertising medium according to claim 1, wherein a thickness of the thinnest portion of the hot melt polyester film bonded to the polyester fabric is 5 µm or more. The advertising medium according to claim 1 or 2, wherein the hot-melt polyester film has a melting point or softening point of 120 to 150 ° C.