JP2011031540A - Blanket for in-line foiler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combination blanket for in-line foiler, which can be used for both of a foil pressing blanket and an adhesive applying blanket. <P>SOLUTION: A rubber layer is provided on at least one layer of a supporting body layer. The rubber layer is coated with a surface layer, and the surface layer is formed by hot melt. The thickness of the surface layer is preferably made to be from 0.02 to 0.2 mm. Further, the static frictional factor of the surface layer with the foil film, which has the slipping property, is preferably made to be 0.6 or lower. For the hot melt for forming the surface layer, one or more of polyester based, denatured olefine based, EVA based, polyamide based, and urethane based resins can be used as a base material for hot melt. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiler blanket for an offset printing machine equipped with an inline boiler, and more particularly to a dedicated blanket used for a boiler incorporated on an inline of an offset printing machine.

  In recent years, a cold foil technique that can express a new pattern or character that cannot be realized by the conventional hot stamping method has attracted attention. In a conventional hot stamping foil, two layers of different transfer materials are formed on a base foil. That is, the first layer is a layer in which silver aluminum is deposited on the base foil, and the second layer is a colored coating agent layer.

  Thus, hot stamping foil stamping requires the user to prepare a specific base foil roll for each required color. In addition, since it is performed off-line using a machine different from the printing unit, the time required for production becomes longer, and further, there are problems that the procurement cost and storage cost of materials increase.

  On the other hand, in the cold foil technology, two foil stations are provided on the printing unit, and foil stamping and printing can be performed in-line. The two foil stations use a unit that prints a special adhesive on the pattern portion to which the foil is to be transferred and a unit that transfers the foil to the portion on which the adhesive is printed.

  Blankets are used for these units. That is, in an inline boiler, a blanket (adhesive-coated blanket) that prints an adhesive to paste a foil, a blanket that presses and transfers the foil onto the adhesive (foil-pressed blanket), and UV printing (ultraviolet light) Three types of blankets (UV blankets) developed for printing using ink that is instantly cured when irradiated) are used.

  Since the adhesive application blanket does not usually have a dedicated blanket, the UV blanket is used. Foil stamping blankets typically require different properties than blankets, i.e., slipperiness with foil films, and special blankets are used in current printing machines. For example, Heidelberg uses a blanket (trade name, Vulcan IRIO) in which an adhesive is applied to the surface of a normal blanket for offset printing and a film is attached. A blanket having such a structure is described in JP-A-8-230304. Man Roland uses a regular offset printing blanket in which glass beads are uniformly embedded in the surface rubber (trade name, Conti Super press). A blanket having such a structure is described in Japanese Patent Application Laid-Open No. 2008-279769.

  In the blanket described in JP-A-8-230304, a nitrile rubber layer is provided on a support in the same manner as a normal printing blanket, and an outer film is formed on the nitrile rubber layer via an adhesive thermoplastic resin material layer. It is formed by laminating. And the said support body is formed by laminating | stacking sequentially the compression layer and reinforcement layer by the microporous structure containing an independent or open cell with the reinforcement layer by a woven fabric.

  In the blanket described in JP-A-8-230304, the accumulated matter can be easily removed by washing because of its extremely low affinity for ink. Further, it can have surface wear resistance and chemical resistance.

On the other hand, the blanket described in JP-A-2008-279769 is provided with a cover layer in which hard components are embedded in a support layer having a reinforcing layer made of woven fabric and a compressible layer. The cover layer is formed by embedding spherical and / or hemispherical hard components made of glass, ceramic, plastic, carbon and metal materials in rubber or silicone serving as a cover layer.
JP-A-8-230304 JP 2008-279769 A

  Each of the foil stamping blankets having the above-described configuration has a special structure and is manufactured with an emphasis on slipperiness, and therefore cannot be used for an adhesive application blanket. Moreover, since the blanket described in JP-A-8-230304 is a method in which a normal blanket is first prepared and an outer film is adhered thereon with an adhesive, it is troublesome and cannot be provided at low cost. In addition, the blanket described in Japanese Patent Application Laid-Open No. 2008-279769 has a problem that it is difficult to embed hard components uniformly, and production is troublesome.

  The present invention has been made in view of the present situation, and provides a blanket for a combined inline boiler that is easy to manufacture and can be used for both a foil stamping blanket and an adhesive application blanket. In addition, since it is easy to manufacture and can be used as a dual-purpose blanket, an inexpensive inline boiler blanket is provided which is reduced in cost.

  In order to achieve the above object, the present invention is configured as follows. That is, the blanket for an inline boiler according to the present invention is characterized in that a rubber layer is provided on at least one support layer, and a surface layer made of hot melt is laminated on the rubber layer. In the present invention, hot melt is not used as an adhesive originally used, but as a surface layer covering a rubber layer.

  The thickness of the surface layer by the hot melt is preferably 0.02 mm or more and 0.2 mm or less. This is because when the thickness is 0.02 mm or less, the hot melt cannot be formed into a film, and when the thickness is 0.2 mm or more, the wearability is deteriorated and the adhesive strength is lowered. In addition, any of polyester, modified olefin, EVA, polyamide, and urethane resins can be used for hot melt, but the static friction between the hot melt and the foil film that is slippery as the surface layer. The coefficient is preferably 0.6 or less. This is because if the static friction coefficient is 0.6 or more, the slipping property is deteriorated, and there is a possibility that a foil film may be caught or wrinkles may be generated during printing. Further, considering the suitability of hot melt adhesive for boilers, the amount of swelling is preferably 0.03 mm or less. This is because printing defects may occur when the thickness is 0.03 mm or more.

  As is apparent from the above description, the present invention has good mountability and good printing quality without any printing defects, whether it is used as a foil stamping blanket or an adhesive-coated blanket.

  Hereinafter, an embodiment illustrating an inline boiler blanket according to the present invention will be described. The blanket for an inline boiler according to the present invention is a blanket having a compressible layer, and as shown in FIG. 1, a reinforcing layer 11 made of woven fabric, a compressible layer 12 being a fine porous layer, and a support. A layer 13, a rubber layer 14, and a surface layer 15 formed by hot melt are sequentially laminated. The reinforcing layer 11 is formed by laminating two known woven cloths such as cotton cloth, rayon cloth, polyester cloth, etc., with an adhesive layer such as rubber paste.

  The compressible layer 12 can be formed by a known means. For example, a hollow microsphere that forms an independent cell by blending a foam molding method in which a foaming agent is blended with a synthetic rubber compound that forms a compressible layer, glass, phenol resin, and hollow microspheres made of a thermoplastic material. Molded by ball mixing method, powder elution method such as water, methanol, etc. that can be dissolved in eluate such as sodium chloride, sugar etc. in synthetic rubber compound and eluted after vulcanization be able to.

  The rubber layer 14 is not directly in contact with printing ink and ink washing solvent as in a normal printing blanket, but is preferably an oil-resistant polymer, such as polychloroprene rubber (CR), polysulfide rubber (T). Polyacrylonitrile-butadiene rubber (NBR), fluorine rubber (FKM), silicone rubber (Q) and the like can be used. Such an oil-resistant polymer may be one added with one or more of a vulcanizing agent, a vulcanization accelerator, a reinforcing agent, an anti-aging agent and the like.

  The surface layer 15 covering the rubber layer 14 is formed by hot melt, the thickness is 0.02 mm or more and 0.2 mm or less, and the static friction coefficient with the foil film which is slippery is 0.6 or less, The swelling amount is 0.03 mm or less. In other words, hot melt is not used as an adhesive, but as a surface layer based on a completely new concept. By limiting the thickness, static friction coefficient, and swelling amount of the hot melt as the surface layer, a good inline foiler is used. A blanket was obtained.

  The thickness of the surface layer by the hot melt is preferably 0.02 mm or more and 0.2 mm or less. As shown in the examples to be described later, when the thickness is 0.02 mm or less, the hot melt cannot be formed into a film, and when the thickness is 0.2 mm or more, the manufactured product is deteriorated and the adhesive strength is reduced. is there. As the hot melt, a film-like hot melt based on a polyester, modified olefin, EVA, polyamide, or urethane resin can be used. The rubber layer 14 may be laminated by thermocompression bonding.

  Hot melt is non-flammable and does not contain any organic solvent, and since it does not contain any water or solvent, its volume does not change and it can be used as a film. Have. In this invention, using these characteristics, hot melt is used as the surface layer of the blanket, not as an adhesive.

  Moreover, it is preferable that the static friction coefficient with the foil film which is slidability of a hot melt is 0.6 or less. This is because when the static friction coefficient is 0.6 or more, slipping with the foil worsens, and the foil is rolled up or wrinkled at the time of printing, so that transfer is not performed well.

  The hot melting point of the hot melt is 50 ° C. or higher and 200 ° C. or lower. This is because if the thermal melting point is 50 ° C. or lower, the film may be dissolved and adhered during printing, and if it is 200 ° C. or higher, the blanket itself may be thermally deteriorated during the production of the blanket for hot-pressing the hot melt.

  Furthermore, considering the suitability of the hot melt adhesive for a boiler, the amount of swelling in an exposure test at room temperature for 72 hours is preferably 0.03 mm or less. This is because if the swelling amount is 0.03 mm or more, good print quality cannot be obtained, and printing defects may occur.

(Thickness of surface layer by hot melt)
In both examples and comparative examples, as shown in FIG. 1, a blanket in which a compressible layer 12, a support layer 13, a rubber layer 14, and a surface layer 15 are laminated on a reinforcing layer 11 obtained by laminating two woven fabrics. used. For the surface layer 15, a polyester hot melt was used, and the thickness was changed to produce a blanket. The thickness of the hot melt is 0.02 mm in Example 1, 0.04 mm in thickness in Example 2, 0.09 mm in thickness in Example 3, 0.10 mm in thickness in Example 4, 0.20 mm in thickness in Example 5 , 0.25 mm thickness was evaluated as Comparative Example 1.

  The test method was performed as follows. A Komori Lislon 226 was used as a printing machine, and each blanket was mounted on the blanket cylinder with standard torque. After passing 100 sheets, retightening was performed with standard torque. An evaluation was made based on whether or not there was a problem with the mounting. The evaluation results are shown in Table 1.

評価基準 ○：装着不具合なし ×：装着不具合あり

Evaluation criteria ○: No mounting failure ×: Mounting failure

  As is apparent from the above evaluation results, no mounting failure was observed when the thickness of the surface layer was 0.20 mm or less. In addition, since the thickness of 0.02 mm is the limit which can be made into a film-like hot melt, the lower limit was set to 0.02 mm.

(Evaluation of slipperiness)
Next, the slip property of the hot melt was evaluated. Here, the slip property of the hot melt is defined as a coefficient of static friction between the foil film and the hot melt. The evaluation method was performed as follows. As the blanket, a blanket in which the compressive layer 12, the support layer 13, the rubber layer 14, and the surface rubber layer 15 were laminated on the reinforcing layer 11 was used as in Examples 1 to 5 and Comparative Example 1. For the surface layer 15, a polyester-based hot melt was used to change the surface smoothness. The smoothness of the surface was adjusted by polishing. For the measurement of the static friction coefficient, a static friction coefficient measuring machine “Tribogear” type 10 manufactured by Shinto Kagaku Co., Ltd. was used.

  The static friction coefficient was 0.8 as Comparative Example 2, 0.7 as Comparative Example 3, 0.6 as Example 6, and 0.5 as Example 7. A Komori Lislon SX-29 was used as a printing machine, and was mounted on a blanket cylinder with standard torque. The evaluation was based on the presence or absence of transfer defects due to entanglement or wrinkling during printing of the foil. The evaluation criteria were ○ when there was no transfer failure and × when there was a transfer failure. The evaluation results are as shown in Table 2.

評価基準 ○：転写不具合なし ×：転写不具合あり

Evaluation criteria ○: No transfer failure ×: Transfer failure

  From the above results, it is preferable that the slipperiness (the coefficient of static friction between the foil film and the hot melt) is 0.6 or less.

Sectional drawing of the blanket structure for preferable inline boilers.

11: Reinforcing layer 12: Compressible layer 13: Support layer 14: Rubber layer 15: Surface layer

Claims (4)

  A blanket for an inline boiler, wherein a rubber layer is provided on at least one support layer, the rubber layer is covered with a surface layer, and the surface layer is formed by hot melt.   The blanket for in-line boiler according to claim 1, wherein the thickness of the surface layer is 0.02 mm or more and 0.2 mm or less.   The blanket for an inline boiler according to claim 1 or 2, wherein a coefficient of static friction with the foil film, which is slipperiness of the surface layer, is 0.6 or less. The surface layer is formed by hot melt based on one or more of polyester-based, modified olefin-based, EVA-based, polyamide-based, and urethane-based resins. Blanket for inline boiler.

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