JP6945122B2 - Transparent sheet-fed film material for printing - Google Patents

Description

The present invention relates to a transparent sheet-fed film material used as a printing medium of a sheet-fed printing machine such as an offset sheet-fed printing machine, and more specifically, a very smooth surface used as a printing medium of a sheet-fed printing machine. It is a highly transparent and transparent sheet-fed film material that has excellent printability and handling when feeding, and also has excellent print clarity and gloss when viewed from the non-printing side when back-printing. It relates to a transparent sheet-fed film material for printing, which is characterized by being present.

The transparent sheet-fed film material for printing of the present invention is mainly used for applications such as POP advertisements, posters, product packages, calendars, catalogs, etc., in which various designs are printed on the transparent sheet-fed film material to give it decorativeness. In addition, it is a mockup of three-dimensional advertising media created by printing various designs on a transparent sheet-fed film material and then further molding, and sales promotion products installed in vending machines and stores. It is used for such purposes.

When printing a design on such a transparent sheet-fed film material for printing, the design is printed as it is on the print receiving layer of the transparent sheet-fed film material for printing, which is generally called front printing, and the print receiving layer is formed. The printing method that becomes the front side and the opposite side of the printing receiving layer of the transparent sheet-fed film material for printing by printing the reverse image of the design on the printing receiving layer of the transparent sheet-fed film material for printing called back printing There are two printing methods that can be used as the front side.

Of the two printing methods, the transparent sheet-fed film material for printing as used in the present invention is often used for back printing. Back printing prints the reverse image of the design on the print receiving layer provided on the transparent sheet-fed film material for printing, and when actually visually recognizing the normal image of the design, the printing image of the transparent sheet-fed film material for printing is printed. The normal image of the design is visually recognized from the opposite side of the printed surface on which the layer is provided, that is, from the non-printed surface side through the transparent film base material or the print receiving layer. Therefore, the transparent sheet-fed film material for printing used for back printing is required to have extremely high transparency. In addition, the non-printing surface, which is the opposite surface of the print receiving layer of the transparent sheet-fed film material for printing, which visually recognizes the normal image of the back-printed design, is usually the surface of the printed design in order to improve the vividness and appearance. Is required to have a glossy feel. When the transparent sheet-fed film material for printing is required to have extremely high transparency in this way, not only the raw materials used for the transparent sheet-fed film material for printing need to be highly transparent, but also the transparent sheet-fed film for printing is required to have high transparency. Since it is necessary that the surfaces on both sides of the material are smooth and there is little diffused reflection of light, if high transparency is required for the transparent sheet-fed film material for printing, the smoothness of the surface is inevitably increased proportionally. The need comes out. Similarly, regarding the glossiness of the surface of the transparent sheet-fed film material for printing, it is basically necessary to suppress diffused reflection of light, so that the surface is inevitably required to have extremely high smoothness.

As described above, the transparent sheet-fed film material for printing used for back printing is basically preferable as the transparency and surface smoothness are higher, but the surface smoothness of the transparent sheet-fed film material for printing is basically preferable. If it becomes very high, for example, the stacked films will stick to each other in the paper feed section of an offset sheet-fed printing press, and the double feed will be fed in a state where multiple sheets are stacked instead of being fed one by one. There was a tendency for problems related to the handleability of so-called transparent sheet-fed film materials for printing to occur easily.

Regarding such a problem, for example, as shown in Japanese Patent No. 2713565, an ink fixing layer is provided on one side of a transparent film, and spherical particles having a particle size exceeding the thickness of the ink fixing layer are added to fix the ink. It has been proposed to make the layers uneven to prevent them from sticking to each other when the films are stacked.

However, in such a method, if a large amount of spherical particles are added to the ink fixing layer, the transparency of the film and the smoothness of the surface are deteriorated. On the contrary, if the amount of spherical particles added is small, the performance of inhibiting the adhesion between the printing film materials is deteriorated, which causes a problem in the handling property. Depending on the required quality of the film and the composition of the film, it may be difficult to balance the functionality of the film. In this method of adding spherical particles to the ink fixing layer to make the surface of the ink fixing layer uneven, the handling property is improved, but on the contrary, various printability is lowered. Therefore, as a countermeasure, the ink fixing layer is used. It has also been proposed to provide a matte layer with spherical particles added to the surface opposite to the surface on which the ink is provided, but such printing film materials are often used for back printing, which is the opposite of the ink fixing layer. This method is also not preferable because if a matte layer to which spherical particles are added is provided on the surface, the sharpness and glossiness of printing as seen from the non-printing surface side when back-printing is performed are lost.

Japanese Patent No. 2713565

The present invention has been made in view of such a situation, and is a transparent sheet-fed film material having a very high surface smoothness used as a printing medium of a sheet-fed printing press, and has various printability. It is possible to provide a transparent sheet-fed film material for printing, which is characterized by excellent handling property at the time of feeding, and also excellent printing clarity and glossiness when viewed from the non-printing surface side when back printing. This is a main subject of the present invention.

As a result of examination by the present inventor in order to solve these problems, normally, when they are laminated in the paper feed section of an offset sheet-fed printing machine, they are in close contact with each other, and the handling property at the time of paper feed is poor and double feeding occurs frequently. Even if the transparent sheet-fed film material for printing has a very high surface smoothness, if embossing is provided on at least one end of the transparent sheet-fed film material for printing, the transparent sheet for printing is provided. When laminating the leaf film material, a small amount of air layer is partially intervened between the transparent sheet-fed film material for printing and the transparent sheet-fed film material for printing, and the transparent sheet-fed film material for printing adheres to the entire surface. In addition, the air is used to assist the handling work in the paper feed section of the offset sheet-fed printing machine, etc. We have found that the ease of handling is improved by making it easier, and have completed the present invention.

That is, the present invention is a transparent sheet-fed film material for printing composed of a print receiving layer provided on at least one surface of a transparent film base material and a transparent film base material, wherein the transparent film base material is a biaxially stretched polyethylene terephthalate film. Alternatively, it is a polycarbonate film, and the transparent sheet-fed film material for printing has embossing on at least one side of one end, and the non-embossed portions on both sides of the transparent sheet-fed film material for printing have the Oken-type smoothness. Each is 5000 seconds or more and 150,000 seconds or less, the Oken-type smoothness of the embossed portion is 1000 seconds or less, the height of the embossed convex portion is in the range of 0.1 to 5.0 μm, and the embossing is performed. The depth of the recess is in the range of 0.01 to 3.00 μm, the total light transmittance of the non-embossed portion is 85% or more, the haze is 10% or less, and the surface of the non-embossed portion of the print receiving layer. It is an object of the present invention to provide a transparent sheet-fed film material for printing, characterized in that the contact angle of water in the above is in the range of 60 to 80 degrees.

According to the present invention, when a transparent sheet-fed film material for printing having a very high surface smoothness is used in a sheet-fed printing machine such as an offset sheet-fed printing machine, it is provided at an end of the transparent sheet-fed film material for printing. The embossing makes it difficult for the transparent sheet-fed film materials for printing to adhere to each other during paper feeding, and not only does double feeding occur, but also various printability is clear when printed from the non-printing side when back-printed. The property and glossiness were also good. In other words, it is a transparent sheet-fed film material with extremely high surface smoothness that is used as a printing medium for sheet-fed printing presses, and has excellent printability and handling during paper feeding, and when back-printed. It is possible to provide a transparent sheet-fed film material for printing, which is characterized by being excellent in print clarity and glossiness when viewed from the non-printing surface side.

FIG. 6 is a schematic cross-sectional view showing an example of an embodiment of the transparent sheet-fed film material for printing of the present invention. FIG. 6 is a schematic cross-sectional view showing an example of an embodiment of the transparent sheet-fed film material for printing of the present invention. FIG. 6 is a schematic cross-sectional view showing an example of an embodiment of the transparent sheet-fed film material for printing of the present invention. FIG. 6 is a schematic cross-sectional view showing an example of an embodiment of the transparent sheet-fed film material for printing of the present invention. A schematic plan view of the transparent sheet-fed film material for printing shown in FIG. 1 as viewed from the print receiving layer side. FIG. 5 is an enlarged schematic cross-sectional view of the peripheral portion of the embossed 4a of the transparent sheet-fed film material for printing shown in FIG.

The transparent sheet-fed film material 3 for printing in the present invention basically starts from the print receiving layer 2 provided on at least one surface of the transparent film base material 1 and the transparent film base material 1, as shown in FIG. Further, it is characterized in that embossing 4a is provided on at least one surface of one end thereof. FIG. 1 is a schematic cross-sectional view showing an example of an embodiment of the present invention characterized in that embossing 4a is provided on a surface of a transparent sheet-fed film material 3 for printing where a print receiving layer 2 is provided. In the present invention, the print receiving layer 2 also includes a layer for improving the adhesion between the ink and the film base material, which is generally called an easy-adhesion layer which is provided in-line at the same time when the transparent film base material is formed. In the present invention, the side on which the transparent sheet-fed film material 3 for printing is printed is referred to as a printed surface 5, and the surface on which printing is not performed is referred to as a non-printed surface 6. Further, in the present invention, as shown in FIG. 2, an antistatic layer 7 may be provided to prevent various problems due to static electricity, if necessary.

FIG. 3 is a schematic cross-sectional view showing an example of an embodiment of the present invention characterized in that embossing 4b is provided on the surface of the transparent sheet-fed film material 3 for printing opposite to the surface on which the print receiving layer 2 is provided. Is. As shown in FIGS. 1 and 3, the embossing may be provided on either one side of at least one end of the transparent sheet-fed film material 3 for printing, or on both sides. It may be appropriately selected and provided according to the necessity and required quality.

FIG. 4 shows an example of an embodiment of the present invention characterized in that a print receiving layer 8 is further provided on the intermediate layer 9 provided on the transparent film base material 1 and an embossed 4a is further provided on the surface thereof. It is a schematic cross-sectional view. This intermediate layer includes an easy-adhesion layer provided in-line during film formation, an anchor layer gravure-coated on the film substrate, and a functional layer for improving the adhesion between layers called a primer layer. In the present invention, by selecting the print image receiving layer 8 having better compatibility with the ink, the print image receiving layer 8 and the ink have very good adhesion and various printability, but the print image receiving layer and the print image receiving layer 8 are very good. Depending on the combination of types of film substrates, the adhesion between the transparent film substrate 1 and the print receiving layer 8 may be insufficient. In such a case, it is preferable to provide the print receiving layer 8 via the intermediate layer 9.

FIG. 5 is a schematic plan view of the example of the transparent sheet-fed film material 3 for printing of FIG. 1 as viewed from the print receiving layer side. As shown in FIG. 5, it can be seen that the embossing 4a is evenly provided in the range of the width A from the end to the inside of the transparent sheet-fed film material 3 for sheet-fed printing. The portion where the embossing 4a is applied is referred to as the embossed portion 10, the portion where the embossing 4a is not applied is referred to as the non-embossed portion 11, and normal printing is performed on the print receiving layer 2 of the non-embossed portion 11.

FIG. 6 is an enlarged schematic cross-sectional view of the peripheral portion of the embossed 4a of the transparent sheet-fed film material 3 for printing shown in FIG. The embossing is usually formed by transferring the embossing pattern to the film by sandwiching the film material between the thermal embossing roll on which the embossing pattern is engraved and the plain roll made of heat-resistant silicone rubber and crimping the film material. At this time, uneven portions such as the embossed convex portion 4a-1 and the embossed concave portion 4a-2 are formed on the film surface regardless of the embossing pattern. These uneven portions prevent the films from adhering to each other, and further, in the gaps between the air-laminated films used to assist the handling work of the printing medium in the paper feed section of the offset sheet-fed printing press. It plays a role of making it easier to enter.

<About transparent sheet-fed film material for printing>
The transparent sheet-fed film material for printing in the present invention has a structure in which a print receiving layer is provided on at least one surface of the transparent film base material and the transparent film base material, and further, at least the transparent sheet-fed film material for printing. It is characterized by having embossing on one side of one end. Further, the transparent sheet-fed film material for printing in the present invention is characterized in that the surface smoothness is very high, and the lower limit of the Oken-type smoothness in the non-embossed portions on both sides of the transparent sheet-fed film material for printing is set. Each is preferably 5000 seconds or more, more preferably 10000 seconds or more, while the upper limit of the Oken-type smoothness is not particularly limited, but is preferably 150,000 seconds or less, and further preferably 100,000 seconds or less. Is more preferable, and more preferably 50,000 seconds or less. If the smoothness of the Oken type in the non-embossed portions on both sides of the transparent sheet-fed film material for printing is within the above range, various printability and the clarity of printing as seen from the non-printing surface side when back-printing are performed. And glossiness are both good.

In the first place, like a general transparent sheet-fed film material for printing, if the smoothness of at least one of the surfaces is lower than 5000 seconds, the handling property at the time of feeding is not so problematic. Embossing as provided in the transparent sheet-fed film material for printing of the present invention is not required. However, when the Oken-type smoothness of the surfaces on both sides of the printing film material without embossing reaches 5000 seconds or more, the handleability of the printing film material gradually begins to deteriorate, and the Oken-type smoothness further increases. When each of them takes 10,000 seconds or more, the printing film materials are very likely to be in close contact with each other, and as a result, the handleability is greatly deteriorated. The transparent sheet-fed film material for printing of the present invention is a transparent sheet-fed film material for printing having extremely high smoothness such that the surface smoothness of the surfaces on both sides thereof is 5000 seconds or more, and is originally very easy to handle. Despite being a transparent sheet-fed film material for printing, which has poor properties, it is characterized by significantly improving the handling property during paper feeding by providing embossing on a part of the transparent sheet-fed film material for printing. .. According to the present invention, high transparency and high smoothness have been required for a printing film material in order to ensure various printability and print clarity and glossiness when viewed from the non-printing surface side when back printing. In spite of this, due to problems such as handleability, it is unavoidable to add an inorganic filler to the print receiving layer to give unevenness, so that various printability and when viewed from the non-printing surface side when back printing is performed. The problem of having compromised and dealt with the sharpness, glossiness and handling of printing was improved by improving the handling without providing uneven parts on the print receiving layer, etc., so that the transparent sheet for printing It is possible to maintain high transparency of the film material and high smoothness of the surface, and as a result, it is possible to secure various printability and the sharpness and glossiness of printing as seen from the non-printing surface side when back printing. Became.

The transparent sheet-fed film material for printing of the present invention has a feature of extremely high surface smoothness, and is also transparent for printing, which affects the sharpness of printing as seen from the non-printing surface side when back-printing. High transparency of the sheet-fed film material is also required. Regarding transparency, it is preferable that at least the total light transmittance of the non-embossed portion where the printing ink is fixed is 85% or more and the haze is 10% or less, and further, the total light transmittance is 90% or more and the haze is 7. It is more preferable that it is% or less. When the total light transmittance and the haze are out of the above ranges, the reverse image of the print design when back-printed on the transparent sheet-fed film material for printing is viewed from the non-printing surface side via the transparent film base material or the print receiving layer. The sharpness of the normal image of the print design of time is lost.

The method for producing the transparent sheet-fed film material for printing of the present invention is not particularly limited. For example, when the transparent film base material is produced, a print receiving layer is provided in-line, embossing is performed in a subsequent step, and then the sheet is printed by a cutting machine. It may be produced by cutting it into leaves, or it may be produced by coating a transparent film base material with a print receiving layer later, embossing it in a subsequent step, and then cutting it into sheets by a cutting machine. Then, the non-embossed portion of the transparent film base material that has been embossed may be coated with a print receiving layer and then cut into sheets by a cutting machine, or the transparent film base material may be provided with a printing receiving layer and then cut by a cutting machine. It may be created by cutting into single sheets and further embossing the sheets on the single sheets one by one.

The transparent sheet-fed film material for printing of the present invention may have at least a print receiving layer on one side, but in addition, an antistatic layer as shown in FIG. 2 is provided as a print receiving layer of the transparent film base material layer. May be provided on the surface opposite to the surface provided with. The antistatic layer is only one sheet from the laminated transparent sheet-fed film material for printing. The transparent sheet-fed film material for printing is charged when the transparent sheet-fed film material for printing is peeled off, so that the transparent sheet-fed film material for printing is charged. It is provided to prevent the film from being easily peeled off from each other and to prevent various problems caused by static electricity during printing. Such an antistatic layer is usually provided in-line at the time of film formation of the transparent film base material, but may be provided later by coating on the transparent film base material, and the manufacturing method is not particularly limited.

The size of the transparent sheet-fed film material for printing of the present invention is not particularly limited because it is a printing material made of a transparent sheet-fed film used in an offset sheet-fed printing press or the like. Basically, various total paper dimensions defined by JIS P0202 or the like may be appropriately selected and used.

The thickness of the transparent sheet-fed film material for printing of the present invention is not particularly limited, but is preferably in the range of 75 to 500 μm, and more preferably 125 to 300 μm. If the thickness of the transparent sheet-fed film material for printing falls below the lower limit of the above range, the film may not be sufficiently stiff or wrinkled easily, and problems may occur during transportation or printing. If the upper limit of the range is exceeded, problems such as a decrease in transparency due to an increase in thickness and difficulty in molding after printing tend to occur.

<Each component of transparent sheet-fed film material for printing>
Next, a detailed description of various constituents of the transparent sheet-fed film material for printing in the present invention is shown below.

(Transparent film base material)
The transparent film base material which is the main component of the present invention is not particularly limited as long as it is a highly transparent film base material, for example, a biaxially stretched polyethylene terephthalate (PET) film or an amorphous polyethylene terephthalate (A-PET). ) Films, glycol-modified polyethylene terephthalate (PET-G) films, polycarbonate (PC) films, PMMA films, biaxially stretched polypropylene (OPP) films, non-stretched polypropylene (CPP) films, and other known films can be used. However, it is more preferable to use a biaxially stretched polyethylene terephthalate film, a polycarbonate film, or the like.

Regarding the thickness of the transparent film base material, the thickness of the print receiving layer and other layers provided on the transparent film base material is very thin with respect to the thickness of the transparent film base material, and the maximum thickness of all the layers is 10 μm. Therefore, the thickness of the transparent film base material is substantially equal to the thickness of the transparent sheet-fed film material for printing described above, and is not particularly limited. Just do it.

Similar to the thickness of the above-mentioned base material, the transparency of the transparent film base material is also required to have performance equal to or higher than the transparency of the transparent sheet-fed film material for printing. The transmittance is preferably 88% or more and the haze is 8% or less, and more preferably the total light transmittance is 90% or more and the haze is 6% or less.

As described above, when the transparent film base material is formed, the print image receiving layer and the antistatic layer are provided on the transparent film base material by gravure coating and then stretched to form the print image receiving layer and the antistatic layer on the transparent film base material. The layers may be formed in-line. In the present invention, the print receiving layer formed in-line is generally intended to improve the coatability of a paint or the like on a transparent film base material and the adhesion to a layer provided on the transparent film base material. A layer called an easy-adhesion layer is also included in one of them.

(Print image receiving layer)
The print receiving layer in the transparent sheet-fed film material for printing of the present invention is provided at least on the outermost layer of one surface of the transparent film base material, and by improving the wettability and permeability of the ink when printing is performed. This layer is basically provided to improve various printability and further improve the adhesion between the ink and the transparent film base material.

The raw material used for the print receiving layer of the present invention is not particularly limited, but mainly comprises a resin raw material for forming a coating film and a filler for improving the permeability of ink. The resin raw material constituting the print receiving layer of the present invention is not particularly limited, but basically a resin having high transparency of the resin and good adhesion to the transparent film base material and the printing ink is preferable, for example, polyester-based. Heat of resin, urethane resin, polystyrene resin, acrylic resin, vinyl acetate resin, vinyl chloride resin, cellulose resin, epoxy resin, polycarbonate resin, alkyd resin, urea resin, phenol resin, etc. Examples thereof include plastic resins, heat-curable resins, ultraviolet-curable resins, and electron beam-curable resins, and one or more of these may be appropriately selected and mixed or polymerized.

The filler constituting the print receiving layer of the present invention is not particularly limited, and various known inorganic fillers and organic fillers can be used. For example, inorganic filler fine particles such as silica, talc, calcium carbonate, magnesium carbonate, aluminum hydroxide, magnesium hydroxide, barium sulfate and mica, and organic filler fine particles such as acrylic resin, epoxy resin, polyamide resin, polyethylene resin and fluororesin. And the like, and one or more of these may be appropriately selected and used. Regarding the transparent sheet-fed film material for printing in the present invention, since transparency and extremely high surface smoothness are required, the amount of filler added to the print receiving layer is not particularly limited, but should be as small as possible. Is preferable, and it is preferably 1.0% by mass or less of the entire print receiving layer, and more preferably 0.6% by mass or less.

As described above, the print receiving layer in the present invention may be formed in-line at the same time when the transparent film base material is formed, and the print receiving layer at this time also includes a layer generally called an easy-adhesion layer. Other methods for forming the print receiving layer include a method of directly coating the transparent film base material with the paint of the print receiving layer, and as shown in FIG. 4, an easy-adhesion layer, an anchor layer, and a primer layer on the transparent film base material. There is a method of providing an intermediate layer such as the above, and further coating and laminating the paint of the print receiving layer on the intermediate layer. The print image receiving layer is basically provided to improve various printability and the adhesion between the ink and the transparent film base material, but as a result of giving priority to improving various printability, the adhesion between the print image receiving layer and the transparent film When is reduced, an intermediate layer is provided between the transparent film base material and the print receiving layer as described above to improve the adhesion between the ink and the transparent film base material, and as a result, the ink and the transparent sheet for printing are printed. It is possible to improve the adhesion of the leaf film material. The thickness of the print receiving layer provided on the transparent film substrate is not particularly limited, but may be in the range of 0.05 to 10.0 μm, and more preferably 0.03 to 3.0 μm.

The Oken-type smoothness of the surface of the non-embossed portion of the print receiving layer in the present invention needs to be 5000 seconds or more. A general transparent sheet-fed film material for printing, in which the surface of the non-embossed portion of the print receiving layer has an Oken-type smoothness of less than 5000 seconds, a filler is added to the print receiving layer to improve ink permeability. Or, in order to improve the handling property, a filler having a large particle size is added to intentionally roughen the surface of the print receiving layer. The transparent sheet-fed film material for printing of the present invention is characterized by having extremely high surface smoothness, and the problem of handleability can be improved by providing embossing. Therefore, the surface of the print receiving layer is roughened in the first place. There is no need to do this, and the addition of filler can be kept to the minimum necessary.

When the Oken-style smoothness of the surface of the non-embossed portion of the print receiving layer is increased, not only clear transfer defects such as print omission of the design with fine lines are reduced, but also uneven shading of the solid printed portion and printing are performed. There is a good tendency to improve printability, such as reducing minute transfer defects such as defects in the reproducibility of halftone dots, but on the other hand, it becomes easier for the films to adhere to each other, and problems such as handling and blocking worsen. There is also a tendency. The Oken-type smoothness of the surface of the non-embossed portion of the print receiving layer in the present invention may be at least 5000 seconds or more, and more preferably 10,000 seconds or more. The upper limit of the Oken-type smoothness of the expression of the non-embossed portion of the print receiving layer is not particularly limited, but is preferably 150,000 seconds or less, more preferably 100,000 seconds or less, and further 50,000 seconds or less. Is more preferable.

The contact angle of water on the surface of the non-embossed portion of the print receiving layer in the present invention is preferably in the range of 50 to 100 degrees, more preferably in the range of 60 to 80 degrees. When the contact angle of water on the surface of the non-embossed portion of the print receiving layer of the present invention is within the above range, the transfer and leveling of the printing ink to the print receiving layer is appropriate, and the halftone dot pattern of the printed image becomes thick. The print reproducibility is appropriate without becoming too thin or too thin.

The transparent film base material and the print receiving layer in the present invention may be subjected to various known surface treatments such as corona treatment and gas plasma treatment in order to improve wettability and adhesion. By performing the surface treatment, the wettability of the paint applied on the surface-treated layer and the adhesion between the paint and the surface-treated layer are greatly improved.

(About embossing)
The transparent sheet-fed film material for printing of the present invention is characterized in that its surface has extremely high smoothness, but if it is left as it is, it is used for printing such as problems of handling and blocking during paper feeding. Various problems that occur when the film materials are laminated occur. The present invention is characterized in that embossing is provided on one surface of at least one end of the transparent sheet-fed film material for printing in order to solve these problems.

The embossing processing method in the present invention is not particularly limited, and various known embossing processing methods may be used, but since the material is a film, it is basically desirable to provide embossing by a processing method using a thermal embossing roll. .. Further, the order of embossing in the manufacturing process of the transparent sheet-fed film material for printing is not particularly limited, and an appropriate process may be selected as necessary. For example, a print receiving layer may be provided in-line at the time of forming a transparent film base material and then embossed immediately before winding, or the transparent film base material is embossed and then the embossed portion is removed to receive a print image. The layer may be coated, the transparent film base material may be coated with the print receiving layer and then embossed, or the film provided with the print receiving layer may be cut into a sheet-fed film sheet and then embossed. You may give it.

The embossing pattern in the present invention is not particularly limited, but it is preferable to provide a simple pattern such as dot-shaped, striped-shaped, or grid-shaped embossing, and further, it is easy to process and wrinkles are hard to occur. It is more preferable to use a dot-shaped embossed pattern. The embossing may be either single-sided embossing or double-sided embossing, and at least one end of the transparent sheet-fed film material for printing may be selected and processed as necessary.

The embossing pattern is not particularly limited, but at least the Oken-type smoothness of the embossed portion is preferably at least 1000 seconds or less, more preferably 500 seconds or less, and further preferably 100 seconds or less. Most preferred. If the smoothness of the embossed part is 1000 seconds or less, the transparent sheet-fed film materials for printing will be hindered from adhering to each other, and air will be laminated to assist the paper handling in the paper feed section of the offset sheet-fed printing machine. Since it becomes easier to enter between the transparent sheet-fed film materials for printing, so-called handling performance is improved, but when the Oken-style smoothness of the embossed part exceeds 1000 seconds, the sheet-fed film materials for printing tend to adhere to each other. Even in the paper feed section, it becomes difficult for air to enter between the transparent sheet-fed film materials for printing, so that the handleability deteriorates sharply. The Oken-type smoothness of the embossed part is a numerical value obtained by preparing a sample in which the entire surface of the transparent sheet-fed film material for printing of a size required for measurement is embossed and measuring the Oken-type smoothness of the surface. Is used.

The embossing in the transparent sheet-fed film material for printing of the present invention has a certain width A (in FIG. 5) on one surface of at least one end of the transparent sheet-fed film material for printing as illustrated in FIG. Only A) needs to be provided. The width A of the embossing provided from the edge of the transparent sheet-fed film material for printing toward the inside thereof is not particularly limited, but may be provided in the range of 1.0 to 50.0 mm, and further 3. It is more preferable that it is provided in the range of 0 to 10.0 mm. When the embossing width A is within the above range, it is possible for the transparent sheet-fed film material for printing to have sufficient handleability while sufficiently securing a portion to receive printing.

As for the embossing in the present invention, for example, the portion where one side is embossed by the thermal embossing roll is illustrated in FIG. 6, and the portion where the convex portion of the thermal embossing roll is pressed is softened by heat. And the transparent film base material 1 are pushed away to form the embossed recess 4a-2, and the pushed-out print receiving layer 2 and a part of the transparent film base material 1 further form the embossed convex portion 4a-1.

The height B of the embossed convex portion (B in FIG. 6) is not particularly limited, but the height B of the embossed convex portion is preferably in the range of 0.1 to 5.0 μm, and more preferably 0.5 to 3 More preferably, it is 0.0 μm. When the height C of the embossed convex portion is within the above range, an air layer is likely to be formed between the films when the films are laminated, and it is possible to prevent the films from completely adhering to each other. .. If the height B of the embossed convex portion is less than the lower limit of the above range, the effect of inhibiting the adhesion between the films becomes insufficient, and if it exceeds the upper limit of the above range, the bulkiness of the embossed portion becomes large when the films are laminated. If too many films are laminated, there is a problem that the edges of the films are curved.

The depth C of the embossed recess (C in FIG. 6) is not particularly limited, but the depth C of the embossed recess is preferably in the range of 0.01 to 3.00 μm, and more preferably 0.01 to 1.50 μm. It is more preferable that the range is. When the depth C of the embossed recess is within the above range, not only is it easy for air to sufficiently enter to assist the handling property at the time of feeding, but also when the films are laminated, a layer of air is formed between the films. Is more likely to be formed, and it is possible to prevent the films from being completely adhered to each other.

The embossed area ratio of the embossed part is not particularly limited, and it is considered inappropriate to increase the embossed area more than necessary from various viewpoints such as required quality, processing difficulty and processing cost, and 1 to 50%. It is preferable to set it arbitrarily in the range, more preferably it is in the range of 1 to 25%, and most preferably it is in the range of 1 to 10%. If the ratio of the embossed area to the non-embossed area is within the above range, not only is it easy for air to assist the handling during paper feeding, but also when the films are laminated. An air layer is likely to be formed between the films, and it is possible to prevent the films from completely adhering to each other.

Next, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to the Examples.

<Transparent sheet-fed film material for printing>
The method for producing the transparent sheet-fed film material for printing used in Examples and Comparative Examples will be described in detail below. The various characteristic values of the various transparent sheet-fed film materials for printing shown in Examples and Comparative Examples shown below are values obtained by measuring the non-embossed portion of the transparent sheet-fed film material for printing. Further, in the transparent sheet-fed film material for printing, the side to be printed at the time of evaluation is designated as the printed side, and the side not printed is designated as the non-printed side. The printed surface Oken type smoothness refers to the Oken type smoothness of the surface of the non-embossed portion of the printed image receiving layer (including the easy-adhesive layer), and the non-printed surface Oken type smoothness refers to the printed image receiving layer (including the easy-adhesive layer). Refers to the Oken-style smoothness of the surface of the non-embossed portion of the surface opposite to the transparent film substrate on the surface provided with the easy-adhesion layer).

Of the characteristic values of the transparent sheet-fed film material for printing, the Oken-type smoothness is based on the JIS P8155 compliant method using the digital Oken-type air permeability / smoothness tester EYO series manufactured by Asahi Seiko Co., Ltd. It was measured. The total light transmittance was measured according to JIS K7361-1 and the haze was measured according to JIS K7136. It was measured by a method compliant with the intravenous drip method in JIS R3257.

<Example 1>
A transparent sheet for printing used in Example 1 in which the edge of one side of the transparent film base material 1 provided with the easy-adhesive layer in-line on one side shown below is heat-embossed. Leaf film material 1 was created.

The details of the transparent film material 1 for printing, the transparent film base material 1 constituting the transparent sheet-fed film material 1 for printing, and the embossing condition 1 are shown below.
(Transparent sheet-fed film material for printing 1)
Total thickness: 125 μm
Printed surface Oken type smoothness (easy adhesive layer side): 25,000 seconds Non-printed surface Oken type smoothness: 23000 seconds Total light transmittance: 93.0%
Haze: 1.5%
Contact angle of water on the printed surface: 62 degrees (transparent film base material 1)
Film substrate thickness: 125 μm
Film type: Biaxially stretched PET film Presence or absence of easy adhesive layer: Thickness of easy adhesive layer: 0.5 μm
Resin composition of easy-adhesion layer: Acrylic resin (embossing condition 1)
Embossed shape: Square dots (0.4 μm x 0.4 μm)
Embossed surface: Printed surface side (easy adhesive layer side)
Embossed part Oken type Smoothness: 40 seconds Embossed part width (A): 10 mm
Embossed convex height (B): 1.50 μm
Embossed recess depth (C): 0.50 μm
Area ratio of embossed part: 9.7%

<Example 2>
As shown below, in Example 2, the end of one side of the surface opposite to the surface of the transparent film base material 1 provided with the easy-adhesive layer in-line on one side is embossed. A transparent sheet-fed film material 2 for printing to be used was prepared. The transparent sheet-fed film material 2 for printing of Example 2 is different from the transparent sheet-fed film material 1 for printing of Example only in that the embossed surface is different.

The details of the transparent film base material 1 and the embossing condition 2 constituting the transparent sheet-fed film material 2 for printing and the transparent sheet-fed film material 2 for printing are shown below.
(Transparent sheet-fed film material for printing 2)
Total thickness: 125 μm
Printed surface Oken type smoothness (easy adhesive layer side): 25,000 seconds Non-printed surface Oken type smoothness: 23000 seconds Total light transmittance: 93.0%
Haze: 1.5%
Contact angle of water on the printed surface: 62 degrees (transparent film base material 1)
Film substrate thickness: 125 μm
Film type: Biaxially stretched PET film Presence or absence of easy adhesive layer: Thickness of easy adhesive layer: 0.5 μm
Resin composition of easy-adhesion layer: Acrylic resin (embossing condition 2)
Embossed shape: Square dots (0.4 μm x 0.4 μm)
Embossed surface: Non-printed surface side Embossed part Oken type Smoothness: 40 seconds Embossed part width (A): 10 mm
Embossed convex height (B): 1.50 μm
Embossed recess depth (C): 0.50 μm
Area ratio of embossed part: 9.7%

<Example 3>
Transparent sheet for printing used in Example 3 by embossing one end of the surface of the transparent film base material 2 provided with the easy-adhesive layer in-line on one side shown below. Film material 3 was created.

The details of the transparent film base material 2 and the embossing condition 3 constituting the transparent sheet-fed film material 3 for printing and the transparent sheet-fed film material 3 for printing are shown below.
(Transparent sheet-fed film material for printing 3)
Total thickness: 300 μm
Printed surface Oken type smoothness (easy adhesive layer side): 28,000 seconds Non-printed surface Oken type smoothness: 25,000 seconds Total light transmittance: 92.0%
Haze: 2.0%
Contact angle of water on the printed surface: 62 degrees (transparent film base material 2)
Film substrate thickness: 300 μm
Film type: Biaxially stretched PET film Presence or absence of easy adhesive layer: Thickness of easy adhesive layer: 0.5 μm
Resin composition of easy-adhesion layer: Acrylic resin (embossing condition 3)
Embossed shape: Square dots (0.4 μm x 0.4 μm)
Embossed surface: Embossed part on the printed surface side Oken type Smoothness: 60 seconds Embossed part width (A): 10 mm
Embossed convex height (B): 1.20 μm
Depth of embossed recess (C): 0.30 μm
Area ratio of embossed part: 9.7%

<Example 4>
The print image receiving layer 1 is laminated by coating on one surface of the transparent film base material 3 not provided with the easy-adhesion layer shown below, and one side of the surface of the transparent film base material 3 provided with the print image receiving layer 1. The transparent sheet-fed film material 4 for printing used in Example 4 was prepared by subjecting the end portion of the film to heat embossing.

Details of the transparent film base material 3 constituting the transparent sheet-fed film material 4 for printing, the transparent sheet-fed film material 4 for printing, the image receiving layer 1 for printing, and the embossing condition 4 are shown below.
(Transparent sheet-fed film material for printing 4)
Total thickness: 127 μm
Printed surface Oken type smoothness (print receiving layer side): 7000 seconds Non-printing surface Oken type smoothness: 24000 seconds Total light transmittance: 91.0%
Haze: 3.5%
Contact angle of water on the printed surface: 70 degrees (transparent film base material 3)
Film substrate thickness: 125 μm
Film type: Biaxially stretched PET film Presence or absence of easy-adhesion layer: None (print image receiving layer 1)
Print receiving layer thickness: 2.0 μm
Coating method: Gravure coating printing Image receiving layer formulation: Thermosetting urethane resin (99.5%),
Silica (0.5%) -Average particle size 4.0 μm
(Embossing condition 4)
Embossed shape: Square dots (0.4 μm x 0.4 μm)
Embossed surface: Embossed part on the printed surface side Oken type Smoothness: 50 seconds Embossed part width (A): 10 mm
Embossed convex height (B): 1.50 μm
Depth of embossed recess (C): 0.40 μm
Area ratio of embossed part: 9.7%

<Example 5>
The print image-receiving layer 1 is laminated by coating on the surface of the transparent film base material 1 provided with the easy-adhesion layer in-line on one side shown below, and the print image-receiving layer of the transparent film base material 1 is laminated. The transparent sheet-fed film material 5 for printing used in Example 5 was prepared by subjecting one end of the surface provided with 1 to heat embossing.

Details of the transparent film base material 1 constituting the transparent sheet-fed film material 5 for printing, the transparent sheet-fed film material 5 for printing, the image receiving layer 1 for printing, and the embossing condition 5 are shown below.
(Transparent sheet-fed film material for printing 5)
Total thickness: 127 μm
Printed surface Oken type smoothness (print receiving layer side): 7000 seconds Non-printing surface Oken type smoothness: 23000 seconds Total light transmittance: 90.0%
Haze: 5.0%
Contact angle of water on the printed surface: 70 degrees (transparent film base material 1)
Film substrate thickness: 125 μm
Film type: Biaxially stretched PET film Presence or absence of easy adhesive layer: Thickness of easy adhesive layer: 0.5 μm
Resin composition of easy-adhesion layer: Acrylic resin (printed image receiving layer 1)
Print receiving layer thickness: 2.0 μm
Coating method: Gravure coating printing Image receiving layer formulation: Thermosetting urethane resin (99.5% by mass),
Silica (0.5% by mass) -Average particle size 4.0 μm
(Embossing condition 5)
Embossed shape: Square dots (0.4 μm x 0.4 μm)
Embossed surface: Embossed part on the printed surface side Oken type Smoothness: 50 seconds Embossed part width (A): 10 mm
Embossed convex height (B): 1.50 μm
Depth of embossed recess (C): 0.40 μm
Area ratio of embossed part: 9.7%

<Example 6>
The print image-receiving layer 2 is laminated by coating on the surface of the transparent film base material 1 provided with the easy-adhesion layer in-line on one side shown below, and the print image-receiving layer of the transparent film base material 1 is laminated. The transparent sheet-fed film material 6 for printing used in Example 6 was prepared by subjecting one end of the surface provided with 2 to thermal embossing.

Details of the transparent film base material 1 constituting the transparent sheet-fed film material 6 for printing, the transparent sheet-fed film material 6 for printing, the image receiving layer 2 for printing, and the embossing condition 6 are shown below.
(Transparent sheet-fed film material for printing 6)
Total thickness: 131 μm
Printed surface Oken type smoothness (print receiving layer side): 9000 seconds Non-printing surface Oken type smoothness: 23000 seconds Total light transmittance: 91.0%
Haze: 4.0%
Contact angle of water on the printed surface: 70 degrees (transparent film base material 1)
Film substrate thickness: 125 μm
Film type: Biaxially stretched PET film Presence or absence of easy adhesive layer: Thickness of easy adhesive layer: 0.5 μm
Resin composition of easy-adhesion layer: Acrylic resin (printed image receiving layer 2)
Print receiving layer thickness: 6.0 μm
Coating method: Gravure coating printing Image receiving layer formulation: Acrylic resin (99.7% by mass),
Silica (0.3% by mass) -Average particle size 8 μm
(Embossing condition 6)
Embossed shape: Square dots (0.4 μm x 0.4 μm)
Embossed surface: Embossed part on the printed surface side Oken type Smoothness: 40 seconds Embossed part width (A): 10 mm
Embossed convex height (B): 1.60 μm
Embossed recess depth (C): 0.50 μm
Area ratio of embossed part: 9.7%

<Comparative example 1>
The transparent film base material 1 used in Example 1 having an in-line easy-adhesion layer provided on one side without embossing was used as the transparent sheet-fed film material 7 for printing used in Comparative Example 1.

The details of the transparent sheet-fed film material 7 for printing and the transparent film base material 1 constituting the transparent sheet-fed film material 7 for printing are shown below.
(Transparent sheet-fed film material for printing 7)
Total thickness: 125 μm
Printed surface Oken type smoothness (easy adhesive layer side): 25,000 seconds Non-printed surface Oken type smoothness: 23000 seconds Total light transmittance: 93.0%
Haze: 1.5%
Contact angle of water on the printed surface: 62 degrees (transparent film base material 1)
Film substrate thickness: 125 μm
Film type: Biaxially stretched PET film Presence or absence of easy adhesive layer: Thickness of easy adhesive layer: 0.5 μm
Resin composition of easy-adhesion layer: Acrylic resin

<Comparative example 2>
A transparent sheet for printing used in Comparative Example 2 in which one side of a transparent film base material 3 on which neither an easy-adhesion layer nor a print receiving layer is provided is used as a printing surface and one end of the surface is embossed. Leaf film material 8 was prepared.

The details of the transparent film base material 3 and the embossing condition 7 constituting the transparent sheet-fed film material 8 for printing and the transparent sheet-fed film material 8 for printing are shown below.
(Transparent sheet-fed film material for printing 8)
Total thickness: 125 μm
Printed surface Oken type smoothness: 22000 seconds Non-printed surface Oken type smoothness: 24000 seconds Total light transmittance: 93.0%
Haze: 1.2%
Contact angle of water on the printed surface: 40 degrees (transparent film base material 3)
Film substrate thickness: 125 μm
Film type: Biaxially stretched PET film Easy-adhesion layer: None (embossing condition 7)
Embossed shape: Square dots (0.4 μm x 0.4 μm)
Embossed surface: Embossed part on the printed surface side Oken type Smoothness: 50 seconds Embossed part width (A): 10 mm
Embossed convex height (B): 1.50 μm
Embossed recess depth (C): 0.50 μm
Area ratio of embossed part: 9.7%

<Comparative example 3>
A comparison of the transparent film substrate 1 having the easy-adhesive layer provided in-line on one side shown below in which the print receiving layer 3 is laminated by coating on the surface provided with the easy-adhesive layer and not embossed. It was prepared as the transparent sheet-fed film material 9 for printing used in Example 3.

The details of the transparent film base material 1 and the print receiving layer 3 constituting the transparent sheet-fed film material 9 for printing and the transparent sheet-fed film material 9 for printing are shown below.
(Transparent sheet-fed film material for printing 9)
Total thickness: 127 μm
Printed surface Oken type smoothness (print receiving layer side): 200 seconds Non-printing surface Oken type smoothness: 23000 seconds Total light transmittance: 88.0%
Haze: 15.0%
Contact angle of water on the printed surface: 73 degrees (transparent film base material 1)
Film substrate thickness: 125 μm
Film type: Biaxially stretched PET film Presence or absence of easy adhesive layer: Thickness of easy adhesive layer: 0.5 μm
Resin composition of easy-adhesion layer: Acrylic resin (printed image receiving layer 3)
Print receiving layer thickness: 2.0 μm
Coating method: Gravure coating printing Image receiving layer formulation: Thermosetting urethane resin (98.0% by mass),
Silica (2.0% by mass) -Average particle size 4.0 μm

<Comparative example 4>
A state in which the matte layer 1 is laminated by coating on the surface opposite to the surface of the transparent film base material 1 provided with the easy-adhesive layer in-line on one side shown below without embossing. Was prepared as the transparent sheet-fed film material 10 for printing used in Comparative Example 4.

Details of the transparent film material 10 for printing and the transparent film base material 1 and the matte layer 1 constituting the transparent sheet-fed film material 10 for printing are shown below.
(Transparent sheet-fed film material for printing 10)
Total thickness: 127 μm
Printed surface Oken type smoothness (easy adhesive layer side): 25,000 seconds Non-printed surface Oken type smoothness (mat layer side): 200 seconds Total light transmittance: 88.0%
Haze: 15.0%
Contact angle of water on the printed surface: 62 degrees (transparent film base material 1)
Film substrate thickness: 125 μm
Film type: Biaxially stretched PET film Presence or absence of easy adhesive layer: Thickness of easy adhesive layer: 0.5 μm
Resin composition of easy-adhesion layer: Acrylic resin (mat layer 1)
Mat layer thickness: 2.0 μm
Coating method: Gravure coating mat layer formulation: Thermosetting urethane resin (98.0% by mass),
Silica (2.0% by mass) -Average particle size 4.0 μm

<Evaluation of transparent sheet-fed film material for printing>
Various evaluations were performed on each of the prepared transparent sheet-fed film materials for printing by the methods shown below.

<Evaluation of handling>
The handling property of the transparent sheet-fed film material for printing was tested under the following conditions, and the results were evaluated for the handling property of the transparent sheet-fed film material for printing according to the following evaluation criteria.
(Test conditions)
A transparent sheet-fed film material for printing is set in a state where 2000 sheets are laminated on the paper feed section of a UV offset sheet-fed printing press, and photographic images and solid coating patterns are printed on all 2000 sheets for double feeding during paper feeding. It was visually observed.
(Evaluation criteria)
A ... No double feeding occurred during paper feeding, and no sign was observed.
B ... Double feeding did not occur during paper feeding, but there were occasional signs of this.
C ... Double feeding was observed very rarely during paper feeding.
D ... Double feeding was frequently observed during paper feeding.

<Evaluation of print reproducibility>
The print reproducibility of the transparent sheet-fed film material for printing was tested under the following conditions, and the results were evaluated for the print reproducibility of the transparent sheet-fed film material for printing according to the following evaluation criteria.
(Test conditions)
A photographic image was printed on the transparent sheet-fed film material for printing by a UV offset sheet-fed printing machine, and the halftone dot pattern after printing was observed with a stereomicroscope.
(Evaluation criteria)
A ... No thickening or thinning is seen in the halftone dot pattern.
B: A slight increase in thickness and thinness can be seen in the halftone dot pattern.
C ... Thickness and thinness can be clearly seen in the halftone dot pattern.
D ... The halftone dot pattern is severely crushed, or cassoulet or omission is seen.

<Evaluation of solid printing unevenness>
The solid printing unevenness of the transparent sheet-fed film material for printing was tested under the following conditions, and the results were evaluated for the solid printing unevenness of the transparent sheet-fed film material for printing according to the following evaluation criteria.
(Test conditions)
A solid coating pattern was printed on the transparent sheet-fed film material for printing by a UV offset sheet-fed printing machine, and the solid printing portion after printing was observed with a stereomicroscope.
(Evaluation criteria)
A ... No unevenness in shading is seen in the solid print area.
B ... Slight unevenness in shading is seen in the solid print area.
C: Light and shade unevenness is clearly seen in the solid print portion.
D: The unevenness of the solid print part is severe and can be clearly confirmed visually.

<Evaluation of ink adhesion>
The adhesion of the ink to the transparent sheet-fed film material for printing was tested under the following conditions, and the results were evaluated for the adhesion of the ink to the transparent sheet-fed film material for printing according to the following evaluation criteria.
(Test conditions)
A solid coating pattern is printed on the transparent sheet-fed film material for printing with a UV offset sheet-fed printing machine, and the adhesion of the printing ink coating film to the transparent sheet-fed film material for printing is determined by the cross-cut method (JIS K5600-5). The test was carried out according to 6), and the degree of peeling of the coating film was observed with a loupe.
(Evaluation criteria)
A ... The edges of the cut are completely smooth, and there is no peeling of the coating film on any of the grids.
B ... There is a small peeling of the coating film at the intersection of the cuts, and the peeled part is less than 5%.
C ... The coating film is peeled off at the edge or intersection of the cut, and the peeled part is 5% or more and less than 15%.
D: The coating film is largely peeled off at the edges and intersections of the cut, and the peeled part is 15% or more.

<Evaluation of print sharpness>
When printed on a transparent sheet-fed film material for printing, the printing clarity when viewed from the non-printing surface, which is the opposite side of the printing surface of the film substrate, was tested under the following conditions, and the results are as follows. The sharpness of the print was evaluated according to the evaluation criteria of.
(Test conditions)
UV offset printing on the transparent sheet-fed film material for printing The printed surface is back-printed with a photographic image, and the printed part is clear when viewed from the non-printing side of the transparent sheet-fed film material for printing. The sex was visually observed.
(Evaluation criteria)
A ... The printed part is very clear.
B ... The printed part is clear, but very slightly cloudy.
C ... Slightly cloudy is seen in the printed part.
D ... Cloudiness is clearly seen in the printed part.

<Evaluation of glossiness>
When back-printed on a transparent sheet-fed film material for printing, the glossiness when viewed from the non-printing surface, which is the opposite side of the printed surface of the film substrate, was tested under the following conditions, and the results were evaluated as follows. The glossiness of the transparent sheet-fed film material for printing on the non-printing surface side was evaluated according to the criteria.
(Test conditions)
A UV offset sheet-fed printing press was used to back-print a photographic image on the transparent sheet-fed film material for printing, and the glossiness on the non-printing surface side of the transparent sheet-fed film material for printing was visually observed.
(Evaluation criteria)
A ... The surface is very smooth, the reflection of light is strong, and the glossiness is very high.
B: The surface is smooth, there is reflection of light, and there is a glossy feeling.
C ... The surface is slightly matte, the reflection of light is weak, and there is not much glossiness.
D ... There is no glossiness at all.

Table 1 shows various evaluation results of the transparent sheet-fed film material for printing in Examples and Comparative Examples of the present invention.

As shown in Examples 1 to 6, even a transparent sheet-fed film material for offset printing having a print receiving layer on at least one surface and having a very high surface smoothness has at least one end of the transparent sheet-fed film material. By embossing one side, it is excellent in various printability such as print reproducibility, solid printing unevenness and ink adhesion, and the clarity of printing seen from the non-printing side when backprinting. It can be seen that it is possible to provide a transparent sheet-fed film material for printing, which has excellent glossiness and excellent handling property at the time of feeding.

If the same transparent film base material as in Example 1 is not embossed as in Comparative Example 1, the handling property at the time of paper feeding is significantly deteriorated, and double feeding occurs frequently. Further, as in Comparative Example 2, if the print receiving layer (including the easy-adhesion layer) is not provided at all, the transferability of the ink is significantly lowered, which not only greatly deteriorates the reproducibility of printing and the unevenness of solid printing. The adhesion between the ink and the transparent sheet-fed film material for printing is also significantly deteriorated.

Further, as shown in Comparative Example 3, when a large amount of filler is added to the print receiving layer to reduce the smoothness of the surface, the handling property is greatly improved, but not only the unevenness of solid printing is deteriorated, but also the back surface is deteriorated. The sharpness of printing when viewed from the non-printing surface side when printing was reduced. On the contrary, when a matte layer is provided on the opposite surface (non-printing surface) of the print receiving layer as in Comparative Example 4 to improve the handling property, there is no problem in the handling property and the printability, but the back printing The sharpness and glossiness of printing when viewed from the non-printing surface side, which is required for such purposes, have been lost.

The transparent sheet-fed film material for printing in the present invention can be used as a printing medium of a sheet-fed printing machine for various offset printing and various silk printing.

1; Transparent film base material 2; Printable image receiving layer (including easy-adhesive layer)
3; Transparent sheet-fed film material for printing 4a; Embossing (embossing provided on the surface on the print receiving layer side)
4a-1; Embossed convex portion 4a-2; Embossed concave portion 4b; Embossed (embossed on the surface opposite to the surface on the print receiving layer side)
5; Printed surface 6; Non-printed surface 7; Antistatic layer 8; Printed image receiving layer 9; Intermediate layer 10; Embossed portion 11; Non-embossed portion A; Width of embossed portion (from the edge of the film toward the inside of the film) Width)
B; Height of embossed convex part C; Depth of embossed concave part

Claims (3)

A transparent sheet-fed film material for printing composed of a print receiving layer provided on at least one surface of a transparent film base material and a transparent film base material, wherein the transparent film base material is a biaxially stretched polyethylene terephthalate film or a polycarbonate film. In addition, the transparent sheet-fed film material for printing has embossing on at least one side of one end, and the non-embossed portions on both sides of the transparent sheet-fed film material for printing have a smoothness of 5000 seconds. It is 150,000 seconds or less, the Oken-type smoothness of the embossed portion is 1000 seconds or less, the height of the embossed convex portion is in the range of 0.1 to 5.0 μm, and the depth of the embossed concave portion is The range is 0.01 to 3.00 μm, the total light transmittance of the non-embossed portion is 85% or more, the haze is 10% or less, and the embossed area ratio of the embossed portion is in the range of 1 to 10%. A transparent sheet-fed film material for printing, wherein the contact angle of water on the surface of the non-embossed portion of the print receiving layer is in the range of 60 to 80 degrees. The transparent sheet-fed film material for printing according to claim 1, wherein the resin raw material forming the coating film of the print receiving layer is an acrylic resin or a urethane-based resin. The transparent sheet-fed film material for printing according to claim 1 or 2, wherein the smoothness of the embossed portion is 100 seconds or less.

Images