JP2002348550A - Film for printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film for printing having excellent conveying properties to a printer without causing an unevenness of a color to a printed image and deteriorating transparency to an adherend when adhered onto the adherend. SOLUTION: This film for printing has a support medium, an adhesive layer and a separator in this order and has printability on the opposite surface to the surface facing to the adhesive layer of the support medium. The support medium and the adhesive layer are substantially transparent and the separator has the surface subjected to roughening treatment to have arithmetic average roughness Ra (JIS B0601-1994) of 0.5-1.5 μm on the opposite side to the surface touching with the adhesive layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing film having a printable support, an adhesive layer, and a separator, and more particularly to a print film in which the support and the adhesive layer are substantially transparent.

[0002]

2. Description of the Related Art Conventionally, a printing film used for a sticker or the like is provided with an adhesive layer on one side of a support having printability, laminated with a separator, and printed on the opposite side of the surface provided with the adhesive layer. Used to print an image on an appropriate surface with an offset printing machine, silk printing machine, etc., or to print an image by a method such as ink jet or electrostatic recording, cut it out and paste it on an advertising medium etc. I have.

[0003] As a separator used in such a printing film, a paper which has been subjected to a release treatment is generally used. However, in the case of paper-based materials, the unevenness of the paper surface is transferred to the surface of the adhesive layer. The beauty of appearance is spoiled. In particular, when affixed to a highly transparent material such as a glass window or an acrylic plate as the adherend, the transparency of the adherend in a portion of the printing film having no printed image is impaired. Further, the type in which the printed image is mirror-image printed and the printed image is viewed through the adherend has a problem that the smoothness of the surface of the adhesive layer is impaired due to the transfer of the concavo-convex pattern of the paper, so that the printed image is difficult to see. .

Further, in the case of a type in which a printed image is viewed through an adherend, there has been an inconvenience that a printed image cannot be confirmed with a separator made of paper as a base material until the separator is removed.

Therefore, it is conceivable to use a plastic film for the base material of the separator so as not to affect the surface of the adhesive layer. A plastic film-based material is preferable because it has excellent smoothness and does not affect the surface of the adhesive layer.However, when printing is performed continuously, the printing film is transported into the printing press. In this case, a double feed phenomenon in which a plurality of sheets are conveyed together occurs.

[0006] In order to prevent such a phenomenon, a method in which the separator is fixed to a mount using a double-sided tape or the like on the transport side surface of the separator and printing is conceivable. However, such a method is costly and complicated.

In order to prevent the double feed phenomenon, a method of improving the transportability by roughening the transport side surface of the separator may be considered. However, simply roughening the surface on the transport side of the separator, when printing with a printing machine, the unevenness of the separator affects the surface having printability through the adhesive layer or support of the printing film, and the printed image The thin portion of the line was cut off, or the solid image portion of the printed image was printed with the uneven shape of the separator, thereby causing color unevenness.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a printing film having a printable support, an adhesive layer, and a separator in this order. An object of the present invention is to provide a printing film which has excellent transportability and does not impair transparency to an adherend when applied to the adherend.

[0009]

According to the present invention, there is provided a printing film having a support, an adhesive layer, and a separator in this order, and having a printability on a surface of the support opposite to the surface having the adhesive layer. A printing film, wherein the support and the adhesive layer are substantially transparent, and the separator has an arithmetic average roughness Ra (JIS B0601-
1994) is subjected to a surface roughening treatment of 0.5 μm or more and 1.5 μm or less.

The printing film of the present invention is characterized in that the base material used for the separator is substantially transparent.

The term "substantially transparent" means that a printed image or the like has transparency enough to be seen through. Therefore, these supports, adhesive layers and separators may be colored.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the printing film of the present invention will be described in which an adhesive layer and a separator are sequentially laminated on a support. The case in which is provided will be described as an example.

The support used in the printing film of the present invention includes polyester, polycarbonate, acryl, triacetyl cellulose, polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyamide,
Substantially transparent plastic films such as polyimide and vinylidene chloride-vinyl chloride copolymer can be used.

In order to improve printability, such a support is provided with, for example, a printing ink easy-adhesion layer in offset printing or silk screen printing, an ink receiving layer in an ink jet system, and a toner receiving layer in an electrophotographic recording system. Can be provided. Further, such a support may be one containing various commonly used ultraviolet absorbers, antioxidants, antioxidants, slip agents, etc., or may have a layer separately containing these. . Preferably, these layers provided on the support are substantially transparent. However, in the case where the ink is soaked into the ink receiving layer as a mirror image by the ink jet method and the printed image is viewed from the adhesive layer side, such a layer need not be transparent.

Since the thickness of the support varies depending on the use, it cannot be determined unconditionally. However, the thickness of the support is preferably 10 μm to 350 μm in consideration of transportability in a printing machine. Also,
Taking into account the mold release property and the ease of peeling the separator described later, the thickness is preferably about 30 μm to 188 μm.

As the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer, generally used acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives and the like are used. Further, an adhesive having performance such as antistatic property may be used. The thickness of the pressure-sensitive adhesive layer is not particularly limited.
μm is desirable.

In general, the pressure-sensitive adhesive layer is prepared by dissolving or dispersing the pressure-sensitive adhesive in a solvent as necessary to form a coating solution, and applying the coating solution by a known coating method to the surface of the support opposite to the surface having printability. It is formed by applying and drying the surface.

The substrate used as the separator of the printing film of the present invention may be a transparent or opaque plastic film such as polypropylene, polyethylene, polyester, polycarbonate, triacetyl cellulose, polyvinyl chloride, acrylic, polystyrene, or the like.
Examples thereof include polyamide, polyimide, and vinylidene chloride-vinyl chloride copolymer. When the printed image is viewed through the adherend, the base material of the separator is preferably substantially transparent. Thus, the image can be confirmed even before the separator is removed. When the printed image is viewed directly from the printed image side, the separator may be opaque.

In the case where the separator using the above-described base material is difficult to peel off from the adhesive layer, it is preferable to provide a release treatment layer on the surface in contact with the adhesive layer. As a method of providing a release treatment layer, a resin having a good release property such as a fluorine-based or silicone-based resin or a release agent such as a silicone oil is mixed with the resin, and dissolved or dispersed in a solvent to form a coating solution. It can be formed by applying and drying a liquid by a known coating method.

The thickness of the substrate is preferably 10 μm to 250 μm in consideration of the mold release property of the printing film and the ease of separation of the separator.
m, preferably 25 μm to 125 μm.

Next, the surface roughening treatment applied to the surface of the separator opposite to the surface in contact with the adhesive layer, that is, the surface on the transport side of the separator, has an arithmetic average roughness Ra (JIS B0601-1994) of 0.5 μm.
It is 1.5 μm or less. With such a surface roughness, it is possible to prevent the double feed phenomenon when the printing film is conveyed into the printing machine and to prevent color unevenness of the printed image even when printing is performed continuously. can do.

If the arithmetic average roughness Ra (JIS B0601-1994) is less than 0.5 μm, the unevenness of the surface on the transport side of the separator is insufficient, and the double feed phenomenon when transported into the printing machine is prevented. Can not. The arithmetic average roughness Ra (JI
If S B0601-1994) exceeds 1.5 μm, the unevenness of the surface on the transport side of the separator becomes excessive, which affects the surface having printability through the adhesive layer and the support, and causes color unevenness in a printed image.

In such a surface roughening treatment, a layer formed from at least a resin component and a surface roughening agent (hereinafter referred to as a layer) is used.
It is referred to as "roughened layer". ) Can be applied.

The resin component includes vinyl chloride resin, vinyl acetate resin, vinylidene chloride resin, polyester resin, urethane resin, polyamide resin, polystyrene resin, acrylic resin, cellulose resin, acetal resin. And thermoplastic resins such as epoxy resins, phenolic resins, melamine resins, and silicone resins, or thermosetting resins, ultraviolet curable resins, electron beam curable resins, and one or more of these. Can be used in combination.

Examples of the surface roughening agent include calcium carbonate, magnesium carbonate, aluminum hydroxide, magnesium hydroxide, titanium oxide, silica, kaolin, perlite, calcium sulfate, barium sulfate, calcined alumina, calcium silicate, talc, mica and the like. And synthetic resin fine particles such as acrylic resin, epoxy resin, nylon resin, polyethylene resin, fluororesin and benzoguanamine resin. These may be used alone or in combination of two or more.

Although the average particle size of the surface roughening agent varies depending on the thickness of the surface roughening treatment layer, it cannot be determined unconditionally.
20 μm, preferably 2 μm to 10 μm, more preferably 3 μm to 5 μm. Further, it is preferable that the particle size distribution is narrow. The addition amount varies depending on the type of the surface roughening agent and the particle diameter, and cannot be determined unconditionally.
1 part by weight to 50 parts by weight, preferably 5 parts by weight to 30 parts by weight, more preferably 8 parts by weight to 15 parts by weight with respect to parts by weight.

When the average particle diameter exceeds 20 μm, or when the average particle diameter is small and the particle size distribution is large and the particles have a large particle diameter, color unevenness of a printed image may not be prevented. . When the average particle size is less than 1 μm, even if most of the particles are buried in the resin, or if the thickness is reduced so as not to be buried in the resin, the arithmetic average roughness Ra is set within a predetermined range. Can not be.

Such a surface-roughened layer may be made of a conductive agent, a coloring agent, an antistatic agent, a cross-linking agent, a leveling agent, or the like, in addition to the resin component and the surface roughening agent described above, as long as the above-mentioned performance is not impaired. Additives such as an agent and an antifoaming agent can be added. In particular, in order to provide antistatic performance so that printing films and dust etc. do not stick together due to static electricity,
It is preferable to add a conductive agent such as a metal fine powder, or an antistatic agent such as a surfactant and an antistatic resin. When the printed image is viewed through the adherend, it is preferable that the surface-roughened layer is substantially transparent like the base material of the separator. Thus, the image can be confirmed even before the separator is removed. When the printed image is viewed directly from the printed image side, the surface roughening layer may be opaque.

A method for forming such a surface-roughening layer is to apply a coating solution obtained by dissolving or dispersing the above-mentioned resin, surface roughening agent, and additives to be added as necessary in a solvent by a known coating method. It can be formed by coating and drying. The thickness of the surface-roughening layer is not particularly limited because it depends on the combination with the average particle diameter of the surface-roughening agent used.
0.1 μm to 18 μm, preferably 0.5 μm to 10 μm
m.

In the method for producing a printing film of the present invention, first, a roughening treatment layer is formed on one surface of a base material, and a release treatment layer is formed on the other surface to produce a separator. .
Next, a layer for improving printability is provided on one surface of the support, an adhesive layer is formed on the other surface, and a release treatment layer of the separator and the surface on which the adhesive layer is formed is formed. It is manufactured by laminating the surfaces facing each other.

In the above description, the case where the separator is formed by coating a release treatment layer and a surface roughening treatment layer and the support is provided with a layer for improving printability has been described. The separator may have release properties on the substrate itself, and the surface roughening treatment may be performed by any means such as sand blasting, even if the arithmetic average roughness Ra is within a predetermined range, without providing a surface roughening treatment layer. It may be used. Further, a support having printability may be used as the support itself.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments. In this embodiment, “part” and “%” are used.
Are by weight unless otherwise indicated. In this example, the average particle size of the surface roughening agent is a value measured by the Coulter counter method.

Example 1 On one surface of a transparent polyester film having a thickness of 75 μm (Lumilar S10: Toray Industries, Inc.), a coating solution for a roughening layer having the following formulation was applied and dried to a thickness of about 2 μm (roughness). A surface roughening layer (thickness of the portion without the surface-imparting agent) was formed. Next, a silicone resin (SRX370: Dow Corning Toray Silicone Co., Ltd.) dissolved with a solvent, and a catalyst (SRX212: Dow Corning Toray Co., Ltd.) are provided on the surface of the polyester film opposite to the surface on which the surface roughening treatment layer is formed. (Silicone Co.) was applied and dried to form a release treatment layer having a thickness of 0.5 μm, thereby producing a separator.

<Formulation of Coating Solution for Surface-Roughening Treatment Layer> Polyester-based resin (solid content: 100%) 8 parts (Vylon 200: Toyobo Co., Ltd.) Surface-roughening agent (silica: average particle diameter 2.5 μm) 1 part ( Sylysia 435: Fuji Silysia Chemical Ltd. Antistatic agent (solid content 50%) 2 parts (Elecond PQ-50B: Soken Chemical Co., Ltd.) Methyl ethyl ketone 44 parts Cyclohexanone 27 parts Ethyl cellosolve 18 parts

Next, a transparent polyester film (Cosmo Shine A410) having a thickness of 50 μm and one surface of which is subjected to easy adhesion treatment.
0: Toyobo Co., Ltd.) was coated with an acrylic adhesive (Nissetsu KP-1410: Nippon Carbide Industry Co., Ltd.) dissolved in a solvent and dried to form an adhesive layer having a thickness of 15 μm. After laminating this with facing the surface of the separator on which the release treatment layer was formed, the laminate was heated at 60 ° C. for 4 hours.
After curing for 8 hours, a printing film of the present invention was prepared.

The arithmetic mean roughness Ra (JIS B0601-1994) of the surface of the obtained printing film on the transport side of the separator is:
It was 1.08 μm.

Comparative Example 1 The printing of Comparative Example 1 was carried out in the same manner as in Example 1 except that a paper separator (SL-80KCZA: Kite Chemical Industry Co., Ltd.) was used without producing the separator of Example 1. A film was prepared.

The arithmetic mean roughness Ra (JIS B0601-1994) of the surface of the obtained printing film on the transport side of the separator is:
It was 1.74 μm.

Comparative Example 2 A printing film of Comparative Example 2 was produced in the same manner as in Example 1 except that the surface roughening layer was not formed on the 75 μm-thick polyester film of Example 1.

The arithmetic average roughness Ra (JIS B0601-1994) of the surface of the obtained printing film on the transport side of the separator is as follows:
It was 0.05 μm.

Comparative Example 3 The same procedures as in Example 1 were carried out except that the roughening agent used in the coating solution for the surface-roughened layer in Example 1 was silica (Sylysia 470: Fuji Silysia Chemical Ltd.) having an average particle diameter of 12 μm. Similarly, a printing sheet of Comparative Example 3 was produced.

The arithmetic mean roughness Ra (JIS B0601-1994) of the surface of the obtained printing film on the transport side of the separator is as follows:
It was 1.61 μm.

These printing films were prepared using an offset printing machine (Type 800: Man Roland).
Evaluation was made on the double feed prevention of the printing film and the color unevenness of the solid image portion of the printed image when 00 sheets were printed and conveyed into the printing machine. In addition, the printed image was mirror-imaged and attached to a glass window as an adherend, and the image viewed through the glass window and the transparency of the portion without the image were evaluated.

The double feed prevention was evaluated as "O" when no double feed phenomenon occurred, and "X" when the double feed phenomenon occurred. Regarding the evaluation of the color unevenness of the solid image portion of the printed image, the case where no color unevenness occurred was evaluated as “○”, and the case where the color unevenness occurred occurred was evaluated as “X”. The evaluation of the image viewed through the glass window was evaluated as "O" when the image was clearly seen, and "X" when the image was blurred. In order to evaluate the transparency of the non-image area when affixed to the glass window, first measure the haze of the glass window, and then illuminate the non-image area of the printing film affixed to the glass window from the printing film side. Was measured by irradiating the sample, and those having a difference of 1% or less were evaluated as "O", and those having a difference of 10% or more were evaluated as "X". In addition, HAZE is a haze meter (HGM-2K:
(Suga Test Instruments Co., Ltd.). Table 1 shows the results.

[0045]

[Table 1]

Since the printing film of Example 1 has been subjected to a specific range of surface roughening treatment on the surface on the transport side of the separator, a gap is formed between the printing films to prevent double feeding into the printing press. However, the image quality of the printed image was good without causing color unevenness in the printed image. Also, since the surface of the separator in contact with the adhesive layer is smooth, it does not affect the adhesive layer, such as an uneven pattern, so that the image is clear even when viewed through a glass window, and the transparency of the part without the printed image is also clear. It was good. In addition, since a transparent substrate was used for the separator, the image could be confirmed without removing the separator.

On the other hand, in the printing film of Comparative Example 1, since the separator was paper, double feeding into the printing press could be prevented, but the arithmetic average roughness Ra was large, and color unevenness occurred in the printed image. I have. In addition, since the irregularities on the surface of the paper were transferred to the adhesive layer, when the image was viewed through a glass window, the image was blurred and the transparency was reduced even in a portion without a printed image. Further, since the base material of the separator was opaque, the image could not be confirmed unless the separator was peeled off.

The printing film of Comparative Example 2 did not undergo color roughening of the printed image because the surface of the separator on the transport side was not subjected to the surface roughening treatment. However, the printing films adhered to each other. Could not be prevented.

In the printing film of Comparative Example 3, since the surface on the transport side of the separator was subjected to a roughening treatment, a gap was formed between the printing films, and double feeding into the printing machine could be prevented. Was. However, the arithmetic average roughness Ra was too large, causing color unevenness in the printed image.

[0050]

According to the present invention, the printed image does not have color unevenness or the like, has excellent transportability into the printing machine, and does not impair the transparency to the adherend when attached to the adherend. A printing film is obtained.

Claims (2)

[Claims] 1. A printing film having a support, an adhesive layer, and a separator in this order, and having printability on a surface of the support opposite to a surface having the adhesive layer, wherein the support and the adhesive layer are provided. Is substantially transparent, and the separator has a surface having an arithmetic mean roughness Ra (JIS B0601-1994) of not less than 0.5 μm and not more than 1.5 μm on a surface opposite to a surface in contact with the adhesive layer. A printing film characterized by being subjected to the following. 2. A printing film, wherein the substrate used for the separator is substantially transparent.