JPH1044382A - Ink stain preventive film, gravure cylinder and gravure printing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an ink stain preventive film having adhesive properties for preventing invasion of ink and satisfactory operability of attachment and detachment without necessity of cleaning stain of a gravure cylinder by forming it of a resin film having solvent resistance and moisture active adhesive properties. SOLUTION: The ink stain preventive film 4 is formed by laminating a solvent resistant film 1 and a moisture active adhesive film 2 or of a solvent resistant and moisture active adhesive film. To use it, a surface of the film 2 is coated with water to activate adhesive properties, and then the surface coated with the water is mounted on a side or shaft of a gravure cylinder. Since the preventive film has the solvent resistance, it is not dissolved by printing ink, and hence the side or shaft of the cylinder is not contaminated directly by the ink. Since the film is not dissolved in the ink, composition of the ink is not altered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention belongs to the technical field of printing or coating. In particular, the ink in the gravure printing or the coating liquid in the gravure coating adheres to the side surface or the shaft of the gravure cylinder during printing or coating to form stains, but the ink stains can easily remove the stains. The present invention relates to a prevention film, and a gravure cylinder and a gravure printing method to which the prevention film is applied. In addition,
Here, a cylinder-shaped printing plate or coated plate used for gravure printing or gravure coating is called a gravure cylinder. Since there is no difference in the gist of the present invention regardless of whether the printing machine or the coating machine is used, a description will be given below of a gravure printing machine.

[0002]

2. Description of the Related Art In a gravure printing machine, a gravure cylinder is immersed in an ink pan filled with ink.
The ink that has adhered to the plate portion other than the cell portion is scraped by a doctor device, and the ink remaining in the cell portion is transferred to printing paper, and printing is performed. At that time, since there is no means for scraping the ink adhered to the side surface and the shaft of the gravure cylinder, the ink is left as it is. FIG. 4 is a diagram showing the appearance of the gravure cylinder. 4, 101 is a gravure cylinder, 102 is its plate surface,
103 is a shaft part, and 104 is a side part. Plate 1
In 02, the ink is scraped off by the doctor device,
There is no means for scraping ink adhering to the shaft 103 and the side surface 104.

[0003]

The ink adhering to the side surface or the shaft of the gravure cylinder dries and hardens, and the ink adheres on the ink to form a plurality of ink films. In extreme cases, the length of the cylinder may exceed the specified length due to the fixed ink, and after printing, the gravure cylinder may not be mounted on the exchange cart. Also, when reprinting a gravure cylinder, it is necessary to wash the attached ink, but to remove the ink attached to the side or shaft of the gravure cylinder wastes a large work load and a lot of work time. Was to do.

As a method for coping with this, Japanese Utility Model Application Laid-Open No. 4-1
No. 37872 describes that a side plate made of a magnet is fixed to both ends of a cylindrical printing plate cylinder main body by magnetic force, and the side plate prevents ink staining of the main body. However, this method still requires cleaning to remove the ink attached to the side plate. Furthermore, in order to sufficiently prevent the invasion of ink, a strong magnet capable of improving the close contact between the main body and the side plate is required, so that the weight of the side plate is increased and workability is poor. Accordingly, an object of the present invention is to provide an ink stain preventing film that does not require cleaning of ink stains, has sufficient adhesion to prevent ink intrusion, and has good workability such as attachment and detachment, and a gravure using the same. It is to provide a cylinder and a gravure printing method.

[0005]

The above objects are achieved by the present invention described below. That is, the present invention is an "ink-stain prevention film made of a resin film having solvent resistance (water resistance) and water-active adhesion (solvent-slip adhesion)". Prior to use, water (solvent) is applied to the surface of the above resin film having water-activated adhesiveness (solvent lubricity) to activate the adhesiveness. Adhere the surface to be prevented. During use, ink stains due to the solvent-based ink (water-based ink) adhere to the solvent-resistant (water-resistant) surface of the resin film that covers the surface of the object to prevent the ink stain. after use,
By peeling off the ink-stained resin film, a clean surface before use is reproduced on that surface of the target object. Also,
The peeled resin film is used up and can be discarded. As described above, according to the present invention, cleaning of ink stains is not required. In addition, since the surface of the resin film and the surface of the target object for preventing ink contamination are joined by bonding, sufficient adhesion to prevent ink from entering can be obtained. In addition, since the adhesive strength can be designed by selecting the type of the resin, an ink stain prevention film having good workability in attachment and detachment is provided.

Further, the present invention is a "gravure cylinder in which a side surface or a shaft is covered with a resin film having solvent resistance (water resistance) and water solubility (solvent solubility)". The resin film of the gravure cylinder is prepared, for example, by dissolving a water-soluble (solvent-soluble) resin in water (solvent) to form an aqueous solution of the resin (solvent solution of the resin). And dried by drying the applied film. When this gravure cylinder is used, even if the side surface portion or the shaft portion is stained with ink, a clean surface before use is regenerated by removing the resin film. The peeled resin film is used up and can be discarded. As described above, according to the present invention, cleaning of ink stains is not required. Further, since the resin film and the side surface portion or the shaft portion of the gravure cylinder are bonded to each other by adhesion, it is possible to obtain adhesiveness that sufficiently prevents ink from entering. In addition, since the adhesive force can be designed by selecting the type of the resin, a gravure cylinder with a good coating / peeling operation is provided.

[0007] The present invention also provides a method for preventing ink stains comprising a resin film having solvent resistance (water resistance) and water-active adhesiveness (solvent-active adhesiveness) when printing using a solvent-based ink (water-based ink). Water (solvent) is applied to the surface of the film having water-activated adhesiveness (solvent-activated adhesiveness) to activate the adhesiveness, and the surface of the ink stain prevention film is attached to the side surface or shaft of the gravure cylinder. And a gravure printing method for removing the ink stain prevention film after printing in that state and preventing the ink stain on the side surface portion or the shaft portion of the gravure cylinder. As described above, according to the present invention, it is not necessary to clean ink stains on the side surface or the shaft of the gravure cylinder. Further, since the resin film and the side surface portion or the shaft portion of the gravure cylinder are bonded to each other by adhesion, it is possible to obtain adhesiveness that sufficiently prevents ink from entering. In addition, since the adhesive strength can be designed by selecting the type of resin, a gravure printing method with good workability in mounting and removing is provided.

[0008]

Next, the present invention will be described by way of embodiments. Ink stain prevention films are classified into two types: a printing ink using an organic solvent-based ink using methyl ethyl ketone or toluene as a solvent, and a water-based ink using a polar solvent such as water or alcohol. Can be divided. As indicated by the expression “solvent resistance (water resistance)” described above, there are two types: a type described by the word immediately before the parentheses and a type described by the words inside the parentheses. Here, the term “solvent” simply means “organic solvent-based ink” or “solvent used in organic solvent-based ink”. Further, when simply described as “water”, it means “aqueous ink” or “solvent used for the aqueous ink”. Therefore, “solvent resistance” in the expression “solvent resistance (water resistance)” in the above example means “resistance” to “organic solvent-based ink” or “solvent used in organic solvent-based ink”. . “Water resistance” means “resistance” to “aqueous ink” or “a solvent used for an aqueous ink”.

First, a case where an organic solvent-based ink is used as a printing ink will be described. As the ink stain prevention film made of a resin film having solvent resistance and water-activated adhesiveness, a polyvinyl alcohol resin film or sheet can be used. When this film or sheet is used alone as an ink stain prevention film, the thickness is preferably about 10 μm to 2 mm in consideration of handleability and the like. When using the ink stain prevention film, first, water is applied to the surface to activate the adhesiveness. Subsequently, the ink stain preventing film having activated adhesiveness is attached to the side surface or the shaft of the gravure cylinder. The preparation work before the start of printing is completed by such simple work.

The gravure cylinder treated as described above has a solvent resistance even when ink adheres to the side surface or the shaft portion covered with the ink stain preventing film used for printing. Therefore, it is not dissolved by the printing ink. Therefore, the side surface or the shaft of the gravure cylinder is not directly stained with ink. In addition, since the ink stain prevention film does not dissolve in the printing ink, the composition of the printing ink is not changed, and the printing is not adversely affected. After the printing is completed, the ink stain preventing film covering the side surface portion or the shaft portion of the gravure cylinder is removed, so that the ink stain at that portion is also removed from the gravure cylinder. This operation is also a simple operation.

The above-described ink stain prevention film uses a single resin film having solvent resistance and water-activated adhesiveness. As described above, it is possible to form a single film, but it is also possible to form a multi-layer film by laminating a film of another resin having solvent resistance. By using a multilayer film, the range of choices of the resin is expanded, and excellent characteristics are easily obtained. As the solvent-resistant resin film in this case, a polyvinyl chloride resin film, a polyester resin film, or the like can be used.

FIG. 1 is an explanatory view showing an example of the structure of the ink stain preventing film of the present invention formed of a multilayer film. In FIG. 1, reference numeral 1 denotes a solvent-resistant film, 2 denotes a water-activated adhesive film, 3 denotes a surface of the water-activated adhesive film 2 coated with water, and 4 denotes an ink stain prevention film. FIG. 1A is an explanatory diagram showing a stage before a film is formed into a multilayer. As shown in FIG. 1A, when bonding the water-activated adhesive film 2 to the solvent-resistant film 1, water is applied to the surface of the water-activated adhesive film 2 to be bonded. The surface 3 coated with water to which the water-activated adhesive property has been applied is bonded to the solvent-resistant film 1.

FIG. 1B is an explanatory view showing the structure of the ink stain preventing film in a state where the lamination is completed. As shown in FIG. 1B, an ink stain preventing film 4 having a multilayer film structure is obtained. Ink stain prevention film 4
In the above, the surface 3 coated with water disappears with the progress of drying after bonding. By adopting the multilayer film configuration as shown in FIG. 1, the ink stain prevention film 4 has at least solvent resistance and water active adhesiveness. In addition, it is easy to take into account mechanical properties that are easy to handle and durable. Polyvinyl alcohol resin film having solvent resistance and water active adhesiveness, the mechanical strength is reduced when containing water by applying water,
The solvent-resistant film 1 can be given a mechanical strength to serve as a support.

The ink stain preventing film of the present invention comprising a resin film having solvent resistance and water-activated adhesiveness,
Although it can be obtained by the above-described single film configuration or multilayer film configuration, it can also be obtained by the configuration described below. The solvent-resistant film can be bonded to the side surface or the shaft of the gravure cylinder using a solvent-resistant adhesive. In FIG. 1, a portion of the resin film 2 having water-activated adhesiveness is replaced with an adhesive having solvent resistance. As the above-mentioned adhesive having solvent resistance, an adhesive having water-activated adhesiveness, a water-soluble adhesive, or an emulsion-based adhesive using water as a dispersion medium can be used. Specifically, for example, an emulsion adhesive such as a vinyl acetate resin emulsion or an acrylic resin emulsion, an adhesive mainly composed of a latex of natural rubber or synthetic rubber, or an adhesive composed of a water-soluble polymer such as polyvinyl methyl ether And the like.

[0015] Apart from the above, ink stains on the side surface or the shaft of the gravure cylinder can be prevented by the configuration described below. That is, the resin dissolved in water is directly applied to the side surface or the shaft of the gravure cylinder and dried, so that the side surface or the shaft of the gravure cylinder is covered with the resin film. This resin film functions as an ink stain prevention film. As the resin film, a resin having solvent resistance and water solubility can be used.

The case where the organic solvent-based ink is used as the printing ink has been described above. Next, the case where the water-based ink is used as the printing ink will be described. As the ink stain prevention film made of a resin film having water resistance and solvent-activated adhesiveness, a film or sheet made of a resin such as vinyl chloride, polystyrene, or cellulose can be used. As an ink stain prevention film,
When using these films and sheets alone,
The thickness is preferably about 10 μm to 2 mm in consideration of handling properties and the like. These resins have solubility in organic solvents, and the dissolved surface of the film or sheet has adhesiveness.
When using the ink stain prevention film, first, an organic solvent is applied to the surface to activate the adhesive property. Subsequently, the ink stain preventing film having activated adhesiveness is attached to the side surface or the shaft of the gravure cylinder. The preparation work before the start of printing is completed by such simple work.

The gravure cylinder treated as described above has a water-resistant ink stain prevention film even when ink adheres to the side or shaft portion covered with the ink stain prevention film used for printing. It is not dissolved by printing ink. Therefore, the side surface or the shaft of the gravure cylinder is not directly stained with ink. In addition, since the ink stain prevention film does not dissolve in the printing ink, the composition of the printing ink is not changed, and the printing is not adversely affected. After the printing is completed, the ink stain preventing film covering the side surface portion or the shaft portion of the gravure cylinder is removed, so that the ink stain at that portion is also removed from the gravure cylinder. This operation is also a simple operation.

The above-mentioned ink stain prevention film uses a single resin film having water resistance and solvent-activated adhesiveness. As described above, it can be composed of a single film, but it can be composed of a multilayer film by being bonded to another water-resistant resin film.
By using a multilayer film, the range of choices of the resin is expanded, and excellent characteristics are easily obtained. In this case, as the water-resistant resin film, a polyvinyl chloride resin film, a polyester resin film, or the like can be used.

The ink stain preventing film having the multilayer film structure is the same as the ink stain preventing film used in the organic solvent ink shown in FIG. 1, except that the "solvent-resistant film" is replaced by the "water-resistant film" The "active film" is replaced with a "solvent activated adhesive film", and the "surface coated with water" is replaced with a "surface coated with a solvent". With respect to the ink stain prevention film having a multi-layer film structure used in the water-based ink, the structure and operation can be easily analogized from the contents already described with reference to FIG. 1 and further description will be omitted.

The ink stain-preventing film of the present invention comprising a resin film having water resistance and solvent-activated adhesiveness can be obtained by the above-described single film structure or multilayer film structure, and also by the structure described below. Obtainable. The water-resistant film can be bonded to the side surface or the shaft of the gravure cylinder using a water-resistant adhesive. As the adhesive having water resistance, an adhesive having solvent-activated adhesiveness,
Solvent-soluble adhesives can be used. Specific examples include a vinyl acetate resin adhesive, a polyurethane adhesive, a rubber adhesive such as chloroprene rubber and nitrile rubber, a cellulosic adhesive such as nitrocellulose, and an acrylic adhesive. These adhesives are applied to an ink stain prevention film, and the adhesive applied surface is attached to a gravure cylinder for use.

[0021] Apart from the above, ink contamination on the side surface or shaft of the gravure cylinder can be prevented by the configuration described below. That is, the resin dissolved in the solvent is directly applied to the side surface or the shaft of the gravure cylinder, and dried, so that the side surface or the shaft of the gravure cylinder is covered with the resin film. This resin film functions as an ink stain prevention film. As this resin film, a resin having water resistance and solvent solubility can be used.

Next, a method of using the ink stain preventing film in gravure printing will be described by taking a case where a solvent-based ink is used as an example. FIG. 2 is an explanatory view of a method of attaching the ink stain prevention film to the side surface of the gravure cylinder. In FIG. 2, reference numeral 4 denotes an ink stain prevention film, and reference numeral 5 denotes a gravure cylinder. First, the ink stain prevention film 4 is cut out according to the size of the side portion of the gravure cylinder 5. As shown in FIG. 2, water is applied to the surface of the ink stain prevention film 4 to be bonded to the gravure cylinder, if the surface has water-activated adhesiveness, and if not, the adhesive is applied. Then, the gravure cylinder 5 is adhered and fixed to the side surface of the gravure cylinder 5.

FIG. 3 shows an ink stain preventing film 4 cut out according to the size of the side surface of the gravure cylinder 5.
FIG. 4 is a view showing a state in which is further divided into three parts and attached to the side surface part of the gravure cylinder 5. As shown in FIG. 3, the ink stain prevention film 4 is not divided into three, but divided into two.
Even if it is divided into four, it can be used after being cut into a size that is easy to use. As described above, when printing is performed with the ink stain preventing film 4 attached to the side surface of the gravure cylinder 5, the ink stain is reduced.
On the surface of the gravure cylinder 5 inside the gravure cylinder 5. After printing, if the ink stain preventing film 4 is peeled off using a spatula or the like, it can be removed from the side surface of the gravure cylinder 5 together with the ink stain attached thereto. The peeled ink stain preventing film 4 is discarded.

[0024]

As described above, according to the present invention, it is not necessary to wash the ink stain, the adhesion which sufficiently prevents the invasion of the ink can be obtained, and the ink stain having good workability such as mounting and dismounting can be obtained. An prevention film, and a gravure cylinder and a gravure printing method using the same are provided. Further, according to the present invention, since the resin has a wide range of physical properties to be used as a material, it is used so as not to adversely affect the ink composition and the like, and so as not to cause the deformation due to the influence of the ink. An ink stain prevention film designed according to the ink can be used.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of a configuration of an ink stain prevention film of the present invention composed of a multilayer film.

FIG. 2 is an explanatory diagram of a method of attaching an ink stain prevention film to a side portion of a gravure cylinder.

FIG. 3 is a view showing a state in which the ink stain prevention film cut out according to the size of the side surface portion of the gravure cylinder is further divided into three and attached to the side surface portion of the gravure cylinder.

FIG. 4 is a view showing the appearance of a gravure cylinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solvent-resistant film 2 Water-activated adhesive film 3 Water-applied surface 4 Ink stain prevention film 5, 101 Gravure cylinder 102 Plate surface 103 Shaft portion 104 Side surface portion

Claims (6)

[Claims] 1. An ink stain prevention film comprising a resin film having solvent resistance and water-activated adhesiveness. 2. An ink stain prevention film comprising a resin film having water resistance and solvent-activated adhesiveness. 3. A gravure cylinder characterized in that a side surface or a shaft is covered with a solvent-resistant and water-soluble resin film. 4. A gravure cylinder characterized in that a side portion or a shaft portion is covered with a resin film having water resistance and solvent solubility. 5. When printing using a solvent-based ink, water is applied to the surface having water-activated adhesiveness of an ink stain prevention film made of a resin film having solvent resistance and water-activated adhesiveness. Activate and apply the surface of the ink stain prevention film to the side or shaft of the gravure cylinder, and after printing in that state, peel off the ink stain prevention film and remove the ink stain on the side or shaft of the gravure cylinder. Gravure printing method characterized by preventing gravure. 6. When printing with an aqueous ink, a solvent is applied to the surface having water-activated adhesion of an ink stain prevention film made of a resin film having water resistance and solvent-activated adhesion to activate the adhesion. The surface of the ink stain prevention film is adhered to the side or shaft of the gravure cylinder, and after printing in that state, the ink stain prevention film is peeled off to prevent ink stain on the side or shaft of the gravure cylinder A gravure printing method.