EP0727326A1 - Blanchet d'impression - Google Patents

Blanchet d'impression Download PDF

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Publication number
EP0727326A1
EP0727326A1 EP96102285A EP96102285A EP0727326A1 EP 0727326 A1 EP0727326 A1 EP 0727326A1 EP 96102285 A EP96102285 A EP 96102285A EP 96102285 A EP96102285 A EP 96102285A EP 0727326 A1 EP0727326 A1 EP 0727326A1
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EP
European Patent Office
Prior art keywords
layer
printing
printing blanket
compressible
thickness
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96102285A
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German (de)
English (en)
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EP0727326B1 (fr
EP0727326B2 (fr
Inventor
Hiromasa Okubo
Toshikazu Kinoshita
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Sumitomo Rubber Industries Ltd
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Sumitomo Rubber Industries Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
    • B41N10/02—Blanket structure
    • B41N10/04—Blanket structure multi-layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/04—Intermediate layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/06—Backcoats; Back layers; Bottom layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/14—Location or type of the layers in multi-layer blankets or like coverings characterised by macromolecular organic compounds

Definitions

  • This invention relates to a seamless printing blanket which is particularly suitable to use in high-speed offset rotary printers.
  • a conventional printing blanket is in the form of flat plate, and has been used by winding it around a blanket cylinder of printer.
  • the printing blanket has a seam portion on the surface thereof. Hence, whenever the seam of the printing blanket passes a nip deformed portion which is generated by pressing the printing blanket with a plate cylinder and the like, the pressing pressure is varied to cause vibration and impact load, so that the quality of printing deteriorates.
  • Japanese Unexamined Patent Publication No. 5-301483 (1993) discloses a printing blanket wherein (i) a porous and seamless compressible layer comprising elastomer such as rubber, (ii) a non-stretchable layer and (iii) a seamless surface printing layer are laminated in this order by interposing a seamless adhesive layer between the respective layers, on an outer peripheral surface of a cylindrical sleeve mounted on a blanket cylinder.
  • the compressible layer, the surface printing layer and the adhesive layer are formed by applying and drying a coating solution including elastomer, and if used rubber, followed by vulcanization.
  • the compressible layer is formed in porous state in order to render vibration absorbability and pressure absorbability to the printing blanket.
  • the non-stretchable layer is formed by winding a non-stretchable wire rod, such as thread, in helical fashion in the circumferential direction.
  • the inside diameter of the sleeve corresponds to the outside diameter of the blanket cylinder, or is slightly smaller than that outside diameter, so that the sleeve is strongly engaged with the blanket cylinder in the normal condition, and when an internal pressure is applied, it has a slight expansion in the radial direction, which permits removal of the blanket cylinder.
  • aeration holes that supply a pressurized gas inside the sleeve are formed in the blanket cylinder.
  • Suitable sleeve include those made of pretty thin metallic material and those made of fiber-glass reinforced plastics. The most preferred are those made of nickel having a thickness of about 0.125 mm in view of the rigidity, the strength and the elasticity.
  • the above printing blanket Since the above printing blanket has not any seam in the circumferential direction thereof, it causes neither vibration nor impact load at the time of printing. However, a plate cylinder, onto which the printing blanket is pressed, has a seam and, when this seam passes the nip deformed portion, vibration and impact are generated.
  • Some of the vibration and the impact can be absorbed by the compressible layer and the surface printing layer comprising elastomer as described, particularly the compressible layer which is porous and has vibration absorbability. Therefore, they might not cause any serious problems for normal printing.
  • high-speed printing of not less than 1,000 r.p.m. is carried out by a high-speed offset rotary printer or the like, the vibration and the impact are large, which cannot satisfactorily be absorbed merely by the compressible layer and the surface printing layer.
  • the printing blanket irrespective of the seam of the plate cylinder, a large expansion in the radial direction, caused by the elastic rebound of the printing blanket which is released from the compression after passing the nip deformed portion, and the ordinary waves wherein the surface printing layer waves due to the expansion, can be prevented by the non-stretchable layer comprising non-stretchable wire rod.
  • the ordinary waves caused by high-speed repeated compression which is generated when passing the nip deformed portions expand to the compressible layer and the non-stretchable layer over the surface printing layer, and therefore, it is impossible to prevent these phenomena only by the non-stretchable layer.
  • the above printing blanket has the disadvantage that printing images particularly at high-speed printing are unclear, thereby resulting in poor printing quality. Further at high speed printing, dynamic fatigue and heat are generated in the respective layers due to the high-speed repeated compression as described, so that the printing blanket life is short.
  • the porous compressible layer which has lower strength than other layers, is liable to cause the permanent set due to the dynamic fatigue and the heat, and then lose the elasticity, that is, a so-called "permanent set in fatigue".
  • the individual layer including the compressible layer, the non-stretchable layer, the surface printing layer and the adhesive layer are preferably as thin as possible.
  • the strength of the printing blanket in the thickness direction is decreased.
  • the impact travels to the sleeve made of pretty thin metallic material as described is liable to have concavities or damage. This needs delicate treatment in the transportation and the like, so that the working ability deteriorates and the wrapping and the transportation cost rises.
  • the compressible layer causes the permanent set in fatigue as previously described.
  • Another object of this invention is to provide a printing blanket which has longer life and facilitates the reuse of a sleeve and the like.
  • the printing blanket of this invention comprises:
  • a seamless adhesive layer comprising elastomer is interposed between the respective layers.
  • the base layer formed immediately on the sleeve functions to absorb vibration and impact load whenever a seam of the plate cylinder passes a nip deformed portion.
  • the base layer also functions, together with the non-stretchable layer, to prevent the elastic rebound caused by the printing blanket when it is released from compression after passing the nip deformed portion, from generating a large expansion in the radial direction and the resulting ordinary waves.
  • the base layer and other layers in this printing blanket do not have any seam in the circumferential direction. It is therefore possible to obtain high quality printings over a wide range from normal printing to high-speed printing.
  • the base layer and the non-stretchable layer function to prevent a large expansion in the radial direction due to the elastic rebound of the printing blanket, so that high-speed repeated compression at high speed printing can be depressed. Therefore, dynamic fatigue and heat can be depressed, thus enabling to prolong the printing blanket life.
  • the base layer also functions to reinforce and protect the sleeve. This allows the printing blanket to have higher strength than conventional ones, to facilitate its handling.
  • the compressible layer which has lower strength than other layers and is most frangible after the prolonged use of the printing blanket, is formed on the base layer, not immediately on the sleeve. This facilitates the removal of the compressible layer, without causing damage to the sleeve.
  • the base layer is not so fragile as the impressible layer, it is possible to reuse the sleeve with the base layer remained.
  • the base layer When preparing the printing blanket wherein the outside diameter is slightly different from the other, the base layer functions to adjust the thickness of the printing blanket, thereby permitting the use of a common mandrel in producing various blankets to offer favorable productivity.
  • Fig. 1 is a partially cutaway view in perspective of an embodiment of a printing blanket in this invention.
  • Fig. 2 is an enlarged section view showing the multi-layer structure of the printing blanket shown in Fig. 1.
  • Fig. 3 is a side view showing a device for measuring the rate of change in the peripheral length of a printing blanket.
  • the printing blanket 20 being one of the embodiments has the multi-layer structure in which on an outer the peripheral surface of the cylindrical sleeve 21, the base layer 1, the porous compressible layer 2, the non-stretchable layer 3 prepared by winding a non-stretchable wire rod around the compressible layer 2, and the surface printing layer 4 are laminated in this order, by interposing the adhesive layers 31 to 34 between the respective layers.
  • the cylindrical sleeve 21 there can be used a variety of known sleeves including, for example, those made of pretty thin metallic material or fiber glass reinforced plastics, as previously described.
  • the sleeves made of nickel having a thickness of about 0.125 mm are suitable to the above printing blanket.
  • the elastomer composing the base layer 1 which is formed on the peripheral surface of the sleeve 21 by interposing the adhesive layer 31 there can be used a variety of synthetic rubbers and thermoplastic elastomers.
  • elastomers which are particularly excellent in vibration absorbability and impact load absorbability, and have higher damping properties to the vibration. It is more preferred that the above elastomers have high oil resistance in view of the resistance to printing inks and the like.
  • these elastomers include synthetic rubbers such as acrylonitrile butadiene copolymer rubber (NBR), chloroprene rubber and urethane rubber.
  • the thickness of the base layer 1 is preferably 0.2 to 10.0 mm, particularly 0.4 to 5.0 mm, more particularly 0.8 to 2.0.
  • the base layer 1 When the thickness of the base layer 1 is less than the above range, the base layer 1 cannot satisfactorily absorb vibration and impact load, and therefore, the printing image is unclear, resulting in poor printing quality. Further, in the respective layers composing the printing blanket 20, the dynamic fatigue and heat are generated due to high-speed repeated compression. As a result, the compressible layer 2 having lower strength than other layers might cause the permanent set in fatigue as described, shortening the life of the printing blanket 20. When the thickness of the base layer 1 is more than the above range, since the rate of change in peripheral length is increased when pressed by the plate cylinder, the printing image is unclear, resulting in poor printing quality.
  • the base layer 1 is prepared from the synthetic rubber such as NBR, a sheet comprising an unvulcanized compound in which various additives are blended in an unvulcanized rubber, is adhered on the peripheral surface of the sleeve 21 on which the adhesive layer has been formed, and after wrapped with a tape or the like, is vulcanized under heating and pressurizing conditions. As a result, the seam of the sheet is fused to give a seamless base layer 1.
  • Examples of the above additives include filler, plasticizer, antioxidant, vulcanizing agent, accelerator, activator and retarder. Each amount may be similar to that of the conventional blankets. Specifically, to 100 parts by weight of unvulcanized rubber, the following amounts are preferable: parts by weight - Filler such as carbon black: 30 to 100 - Plasticizer such as stealine acid: 0.5 to 1.5 - Antioxidant: 1 to 4 - Vulcanizing agent such as sulfur: 0.5 to 3 in total - Accelerator: (each 0.5 to 3 when used two or more kinds) 0.5 to 3 - Activator such as zinc oxide: 3 to 5 - Retarder: 0 to 0.5
  • the following manner which is the same as in the compressible layer 2 and the surface printing layer 4 as described later, may be employed. Specifically, on the peripheral surface of the sleeve 21 on which the adhesive layer 31 has been formed, a rubber cement containing the respective additives is coated (spread) in a predetermined thickness with the use of a doctor blade or a doctor roll, which is then vulcanized under heating and pressuring conditions.
  • the surface of the base layer 1 thus prepared is preferably polished by a cylindrical grinding machine or the like to finish in a predetermined surface roughness and thickness.
  • the base layer 1 may be in a single-layer or a multi-layer.
  • a base layer similar to the base layer 1 can be provided between the non-stretchable layer 3 and the surface printing layer 4.
  • the compressible layer 2 which is formed on the base layer 1 by interposing the adhesive layer 1, has a porous structure excellent in vibration absorbability.
  • the porous structure is classified into an open cell structure in which voids in a layer are connected with each other, and a closed cell structure in which voids are independent from each other. Both structures are applicable to this invention, but in order to effectively give the impact absorbability, the open cell structure is preferred.
  • the percent of void which indicates the proportion of voids for the compressible layer 2 having the open cell structure is not particularly limited, but preferably 30 to 60 %, particularly 35 to 55 %, more particularly 35 to 45 %.
  • the compressible layer 2 When the percent of void is below 30 %, the compressible layer 2 could not satisfactorily absorb the impact. When it is over 60 %, the strength of the compressible layer 2 might cause the permanent set in fatigue, shortening the life of the printing blanket 20.
  • elastomer composing the compressible layer 2 those excellent in oil resistance are suited.
  • those excellent in oil resistance are suited.
  • the thickness of the compressible layer 2 is preferably 0.15 to 0.6 mm, particularly 0.2 to 0.5 mm, more particularly 0.2 to 0.3 mm.
  • the compressible layer 2 could not satisfactorily absorb the pressure generated by the contact-press of the plate cylinder. Therefore, the surface of the printing blanket 20 is largely deformed by the press of the plate cylinder to cause a so-called bulge, which increase the rate of change in the peripheral length of the printing blanket 20. As a result, the printing image is unclear, resulting in poor printing quality.
  • the pressure of the printing blanket 20 to the plate cylinder and a paper is decreased. Therefore, the ink transfer ability to solid parts in the printing image (a so-called solid applicability) is reduced to cause ink squeezeout in the solid parts. Further, at the time of printing, the respective layers composing the printing blanket might slip toward downstream in the rotational direction of the printing blanket 20, resulting in shear of ink-transfer in the printing. In addition, the strength of the compressible layer 2 is decreased to cause the aforesaid permanent set in fatigue, thereby shortening the life of the printing blanket 20.
  • the compressible layer 2 having the open cell structure is prepared from the aforesaid synthetic rubber, the following leaching method is suitable to produce the layer 2.
  • a rubber cement in which the above additives and water soluble powder such as sodium chloride are blended in an unvulcanized rubber is coated (spread) to a predetermined thickness with the use of the doctor blade or the doctor roll, which is then vulcanized under heating and pressurizing conditions, thereby forming a vulcanized rubber layer.
  • the vulcanized rubber layer may be formed, like the base layer 1, by adhering a sheet comprising an unvulcanized compound containing the above additives, on the surface of the base layer 1 on which the adhesive layer 32 has been formed, followed by vulcanizing under heating and pressurizing in the state that the surface of the base layer 1 is wrapped with a tape or the like.
  • the printing blanket 20 for which the vulcanized rubber layer has been formed is immersed in warm water of about 60 to 100°C for about 6 to 10 hours to elute and remove the water soluble powder, and well dried to remove water, thereby giving a porous compressible layer 2 in which the traces of the water soluble power have turned into open cells.
  • the percent of void for the compressible layer 2 changes with the amount of the water soluble powder in the rubber cement or the unvulcanized compound. Specifically, as the amount of the water soluble powder compound is increased, the percent of void is increased. Therefore, the water soluble powder should be blended at a specific amount adjusted to form a desired percent of void into the rubber cement or the unvulcanized compound.
  • foaming method is preferably employed for the formation of the compressible layer 2 having the closed cell structure. Specifically, an expanding agent is added to the cement rubber or the unvulcanized compound, and the mixture is foamed at the time of vulcanization.
  • the surface of the compressible layer 2 thus prepared is preferably finished to have a predetermined surface roughness and thickness, with the use of a cylindrical grinding machine in the same manner as in the base layer 1.
  • the non-stretchable layer 3 which is formed on the compressible layer 2 by interposing the adhesive layer 33, is formed by winding a non-stretchable wire rod on the compressible layer 2 in circumferential direction in helical fashion while applying tension thereto.
  • Examples of the wire rod include cotton string, polyester string, and rayon string are suited, in view of the ease of the winding, the conformability with the adhesive layer 33 and 34, and the non-stretching property (i.e., tensile strength).
  • the diameter of the wire rod is not particularly limited, but preferably 0.1 to 0.5 mm, particularly 0.15 to 0.35 mm, more particularly 0.20 to 0.30 mm.
  • the wire rod might inhibit the compressible layer 2 from absorbing the pressure generated when the plate cylinder is pressed thereto, and the surface of the printing blanket 20 is liable to cause bulge, which increases the rate of change in the peripheral length. As a result, the printing image is unclear, resulting in poor printing quality.
  • the spacing between the wire rods adjacent to each other is not particularly limited, but preferably not more than 0.05 mm. It is more preferred to wind so as to have little spacing as shown in Fig. 1.
  • the non-stretchable layer 3 could not satisfactorily prevent a large expansion in the radical direction and the resulting ordinary waves, which are caused by the elastic rebound of the printing blanket when it is released from the compression after passing the nip deformed portions.
  • the tensile strength in winding the wire rod (e.g., cotton string) in helical fashion is preferably 100 to 800 g, particularly 200 to 700 g, more particularly 300 to 500 g.
  • the aforesaid effect of the non-stretchable layer 3 is insufficient, thereby decreasing the compression of the printing blanket 20 with respect to the plate cylinder and a paper.
  • the ink transfer ratio for solid parts in the printing image (the solid applicability) deteriorates, resulting in ink squeezeout.
  • the compressible layer 2 receives too load at the time of the winding of the wire rod to avoid the permanent set in fatigue.
  • the elastomer composing the surface printing layer 4 which is formed on the compressible layer 3 by interposing the adhesive layer 3 there can be used those excellent in vibration absorbability and impact absorbability, damping properties to vibration, and oil resistance.
  • polysulfide rubber and hydrogenated NBR are usable.
  • the thickness of the surface printing layer 4 is 0.1 to 0.4 mm, preferably 0.1 to 0.3 mm, more preferably 0.15 to 0.3 mm.
  • the surface printing layer 4 tends to slip downstream in the rotational direction of the printing blanket. As the slip is increased, the ratio of change in peripheral length is increased. This might produce unclear printing image, resulting in poor printing quality.
  • a rubber cement containing the aforesaid additives and unvulcanized rubber is coated (spread) in a predetermined thickness on the surface of the non-stretchable layer on which the adhesive layer 34 has been formed, with the use of the doctor blade or the doctor roll, followed by vulcanizing under heating and pressurizing conditions.
  • the surface printing layer 4 can also be formed, as in the based layer 1, by adhering a sheet comprising an unvulcanized compound containing the aforesaid additives on the surface of the non-stretchable layer 3 on which the adhesive layer 34 has been formed, followed by vulcanizing under heating and pressurizing conditions in the state that the surface of the sheet is wrapped with a tape or the like.
  • the surface of the surface printing layer 4 is preferably finished to a predetermined surface roughness and thickness with the use of the cylindrical grinding machine or the like, in the same manner as in the base layer 1 and the compressible layer 2.
  • the surface roughness of the surface printing layer 4 correlates closely with the printing accuracy. Therefore, it is required to be strictly finished.
  • the surface roughness is not particularly limited, but preferably ranges 1 to 10 ⁇ m, preferably 2 to 8 ⁇ m, more preferably 3 to 6 ⁇ m, according to ten points mean roughness (Rz).
  • the adhesive layer 31 between the sleeve 21 and the base layer 1 when the sleeve 21 is made of metal, suited are those comprising elastomer and having superior adhesive properties for both the metal and the elastomer used in the base layer 1. It is preferable to jointly use an adhesive having superior adhesive to metal and another having superior adhesive to the elastomer used in the base layer 1. Specifically, the former adhesive is coated using the doctor blade or the doctor roll on the surface of the sleeve, and the latter adhesive is coated thereon and dried in a similar manner to obtain an adhesive layer having the two-layer structure.
  • the former adhesive include "Chemlock 205" available from Load Chemical Corporation.
  • “Chemlock 252X” available from Load Chemical Corporation, is used as the latter adhesive.
  • These adhesives are unvulcanized rubbers, and act to bond between the sleeve 21 and the base layer 1 by vulcanizing them together with the base layer 1.
  • the thickness of the adhesive layer 31 is not particularly limited. It is preferable that the thickness of the adhesive layer having the two-layer structure is in a range of 0.02 to 0.25 mm. When it is below 0.02 mm, sufficient adhesive strength could not be obtained. When it is over 0.25 mm, the functions of other layers might be inhibited.
  • the adhesive layer 32 between the base layer 1 and the compressible layer 2; the adhesive layer 33 between the compressible layer 2 and the non-stretchable layer 3; and the adhesive layer 34 between the non-stretchable layer 3 and the surface printing layer 4, are prepared from elastomer, particularly synthetic rubbers excellent in oil resistance as previously described.
  • the adhesive layer 32 is prepared by coating a rubber cement containing the unvulcanized rubber of the aforesaid synthetic rubber on the surface of the base layer 1, with the use of the doctor blade or the doctor roll, and is subjected to the vulcanization together with the compressible layer 2 on the base layer 1.
  • the adhesive layer 33 is prepared by coating a similar rubber cement on the surface of the compressible layer 2 with the use of the doctor blade or the doctor roll, on which the wire rod composing the non-stretchable layer 3 is wound, followed by vulcanization, by which the adhesive layer 33 and the compressible layer 2 are molten and integrally formed around the wire rod as shown in Fig. 2.
  • the adhesive layer 34 is prepared by coating a rubber cement similar to those mentioned above on the surface of the non-stretchable layer 3 with the use of the doctor blade or the doctor roll, followed by the vulcanization together with the surface printing layer 4 which is formed on the non-stretchable layer 3.
  • all of the layers may be simultaneously vulcanized to form the adhesive layer 33, the non-stretchable layer 3, the adhesive layer 34 and the surface printing layer 4 at once.
  • the thicknesses of the adhesive layer 32, 33 or 34 is not particularly limited, and is preferably 0.01 to 0.1 mm. When it is below 0.01 mm, sufficient adhesive could not be obtained. When it is over 0.1 mm, the functions of other layers might be inhibited.
  • the seamless base layer which comprises elastomer and is laminated on the peripheral surface of the cylindrical sleeve by interposing the adhesive layer. It is also possible to obtain the printing blanket having no seam in the circumferential direction, which has high strength, prolonged life and the ease of handling to facilitate the reuse of the sleeve and the like.
  • a sleeve 21 made of nickel (the inner diameter: 169.5 mm; the length: 910 mm; the thickness: 0.125 mm, available from Taiyo Kogyo Co., Ltd.) was mounted on a mandrel for vulcanization which has a similar detachable sleeve mechanism under compressed gas, as in the aforesaid blanket cylinder.
  • the outer peripheral surface of the sleeve 21 was coated and dried with the aforesaid "Chemlock 205", and then the aforesaid "Chemlock 252X” was coated thereon and dried, to prepare an adhesive layer 31 having the two layer structure (0.05 mm in thickness).
  • An unvulcanized compound comprising the following ingredients was kneaded using a kneader (available from Moriyama Seisakusho Co., Ltd.), and extruded using a 14 x 36-inch roll (available from KANSAI ROLL CO., LTD.) to prepare a sheet having the thickness of 2.0 mm and the width of 900 mm. This sheet was bonded on the surface of the adhesive layer 31.
  • a kneader available from Moriyama Seisakusho Co., Ltd.
  • 14 x 36-inch roll available from KANSAI ROLL CO., LTD.
  • the surface of the sheet was wrapped with a nylon band having the width of 30 mm, with the use of a wrapping machine (available from Sumitomo Rubber Industries, Ltd.), and was vulcanized with a vulcanizer (1000 x 2000 mm, available from KANSAI ROLL CO., LTD.) at 140°C and 3kg/cm 2 for 90 minutes, and polished with a cylindrical grinding machine (available from Toyoda Koki Co., Ltd.), to give a base layer 1 having the thickness as shown in Table 1 (the dimensional tolerance: within ⁇ 0.01 mm).
  • a rubber cement for adhesive layer which comprises the following ingredients was coated with a rotational spreader employing the doctor roll, and air-dried for 30 minutes to give an adhesive layer 32 (0.05 mm in thickness).
  • a rubber cement for compressible layer which comprises the following ingredients, was coated with the aforesaid rotational spreading machine, and air-dried for 12 hours.
  • the coated surface was tightly wound with a cotton-woven sheet (1000 mm in width), and then vulcanized with the aforesaid vulcanizer at 140°C and 3kg/cm 2 for 90 minutes.
  • the vulcanized matter was immersed in warm water of 70°C for 12 hours to extrude and remove the sodium chloride, followed by hot-drying at 100°C for 60 minutes, the surface of which is polished with the aforesaid cylindrical grinding machine to give a porous compressible layer 2 having the open cell (0.3 mm in thickness, within ⁇ 0.01 mm in dimensional tolerance, 35 % in the percent of void).
  • the same rubber cement as used in the adhesive layer 32 was coated by the aforesaid cylindrical spreading machine, and was air-dried for 30 minutes to give an adhesive layer 33 (0.05 mm in thickness).
  • a cotton string (0.250 mm in diameter) was wound in helical fashion while applying the tensile strength of 380 ⁇ 10gf.
  • the spacing between the cotton strings adjacent to each other was adjusted to not more than 0.05 mm.
  • the winding of the cotton string was carried out by a cylinder-shaping machine (available from Sumitomo Rubber Industries, Ltd.).
  • the surface of the wound cotton string was wrapped up by tightly winding a cotton-woven sheet (1000 mm in width) in helical fashion in the circumferential direction, and was vulcanized using the aforesaid vulcanizer at 140°C and 3kg/cm 2 for 90 minutes, to prepare a non-stretchable layer 3.
  • the same rubber cement as used in the adhesive layer 32 was coated by the aforesaid rotational spreading machine, and air-dried to prepare an adhesive layer 34 having the thickness of 0.05 mm.
  • a rubber cement comprising the following ingredients was coated by the aforesaid rotational spreading machine, and air-dried for 12 hours.
  • the coated surface was wrapped up by tightly winding a cotton-woven sheet (1000 mm in width) in helical fashion in the circumferential direction, and then vulcanized with the aforesaid vulcanizer at 140°C and 3kg/cm 2 for 90 minutes.
  • the surface of the vulcanized surface was polished with the aforesaid cylindrical grinding machine to prepare a surface printing layer 4 (0.2 mm in thickness, within ⁇ 0.01 mm in dimensional tolerance, 3 to 5 in ten points mean roughness (Rz)), thus obtaining a printing blanket.
  • a fabric layer (the thickness: 1.05 mm, available from Moriuchi Orimono Co., Ltd.), (i) a porous compressible layer having the open cell structure (the thickness: 0.3 mm, the percent of void: 35 %), which comprises the same rubber cement for the compressible layer as used in Examples 1 to 7; (ii) a reinforced layer (the thickness: 0.3 mm, available from Moriuchi Orimono Co., Ltd.); and (iii) a surface printing layer which comprises the same rubber cement for the surface printing layer as in Examples 1 to 7, are laminated in this order, to obtain a flat printing blanket.
  • the surface was wrapped up by tightly winding a cotton-woven sheet (1000 mm in width) in the circumferential direction, and then vulcanized at 140°C and 3kg/cm 2 for 90 minutes, which was immersed in warm water of 70°C for 12 hours to extrude and remove sodium chloride, and heated and dried at 100°C for 60 minutes, thus obtaining a compressible layer (0.15 mm in thickness, 35% in percent of void).
  • the surface of the coated rubber cement was wrapped up by tightly winding a cotton-woven sheet (1000 mm in width) in the circumferential direction, and then vulcanized using the aforesaid vulcanizer at 140°C and 3kg/cm 2 for 90 minutes.
  • the vulcanized surface was polished by the aforesaid cylindrical grinding machine to give a non-stretchable layer (0.25 mm in thickness), and a surface printing layer (0.45 mm in thickness, 3 to 5 in ten points mean roughness (Rz)), thus obtaining a printing blanket.
  • a printing blanket provided with a compressible layer in which plural micro spheres are dispersed was selected and prepared as follows.
  • a printing blanket was obtained in the same manner as in Comparative Example 3, except that instead of the compressible layer, on the surface of an adhesive layer having the two-layer structure formed on the peripheral surface of the sleeve made of nickel, a rubber cement comprising the following ingredients was coated and air-dried for 12 hours, the coated surface was wrapped up by tightly winding a cotton-woven sheet (1000 mm in width) in the circumferential direction, and then vulcanized using the aforesaid vulcanizer at 140°C and 3kg/cm 2 for 90 minutes to prepare a compressible layer.
  • the viscoelasticity (tan ⁇ ) for each printing blanket was determined with a viscoelasticity spectrometer (product No. DVE-V4, available from Rheology Corp.). Based on the fact that as the tan ⁇ is increased, the viscoelasticity is improved, the vibration absorbability for each printing blanket was evaluated.
  • a 10mm x 10mm sample penetrating the sleeve or the base layer was taken.
  • a 16 Hz sin-wave vibration having the amplitude of 0.05 mm and the initial strain of 0.1 mm was applied at ordinary temperature.
  • the measuring conditions corresponded to that when the printing blanket is used for high-speed printing of 1000 r.p.m, the blanket receives about 17-time repeated compressions every second.
  • the tan ⁇ for the compound composing the base layer 1 of each printing blanket after vulcanization was 0.05 when it was measured in accordance with the above measuring method.
  • the ratio of change in peripheral length (%) for each printing blanket was determined. As described above, as the ratio of change in peripheral length is increased, the printing image is unclear and the printing quality deteriorates. Therefore, smaller values are preferred.
  • the printing blanket 20 is mounted on the drum 6 which has the sleeve detachable mechanism with pressure gas, as in the aforesaid blanket cylinder, and is fixed to the drive shift 5 that is driven rotationally in the direction shown with an arrow in Fig. 3.
  • the drive shift was rotated in a predetermined times to obtain the difference in the rotations of drums 6 and 7, from which the ratio of change in peripheral length (%) was determined.
  • the reference numeral 8 denotes a bearing unit that supports the drive shift 5; 9 denotes a bearing unit that supports the shaft 71 of the drum 7 and is movable upward and downward as shown with the white arrow; 10 denotes a spring that supports the bearing unit 9 from below; and 11 denotes a load cell for measuring the compression of the drum 7 with respect to the printing blanket 20.
  • the depression of the drum 7 to the printing blanket can be adjusted.
  • the measuring conditions to determine the ratio of change in peripheral length with the use of the above device were as follows: Diameter of the drum 6 (for seamless printing blanket) 169.520 mm Diameter of the drum 6 (for flat printing blanket) 170.100 mm Diameter of the drum 7 173.915 mm Depression of the drum 7 to the printing blanket 20 0.1 mm Rotational speed of the drive shaft 5 1,000 r.p.m Revolution of the drive shaft 5 500 times
  • the amount of the permanent set in fatigue (mm) for each printing blanket was determined. Based on the obtained results, the durability for each printing blanket was evaluated. As the amount is decreased, the durability is increased.
  • Example 2 Using the same manner as in Example 3, except that the thickness of the surface printing layer 4 was set to that in Table 2, a printing blanket 20 was prepared.
  • Example 3 For the printing blankets prepared in above Examples, Example 3 and Comparative Examples 2 to 4, the above measurement of the ratio of change in peripheral length and the following solid applicability evaluation were conducted to evaluate each characteristics.
  • Each printing blanket was mounted on a high speed offset rotational printing, and using oil based ink of Japanese-ink color, the solid printing was carried out on the surface of a woodfree paper.
  • Example 3 Using the same manner as in Example 3, except that the thickness of the compressible layer 3 was set to that in Table 3, a printing blanket 20 was prepared.
  • Example 3 The procedures as in Example 3 were carried out except that the amount of sodium chloride in the rubber cement for the compressible layer comprising the compressible layer 2 was adjusted as follows:
  • Example 3 Using the same manner as in Example 3, except that the compressible layer 2 prepared by foaming in order to have closed cell structure was used, a printing blanket 20 was prepared.
  • Example 3 After forming the base layer 1, the compressible layer 2 and the non-stretchable layer 3 in the same manner as in Example 3, the same rubber cement for the adhesive layer as in Example 3 was coated on the surface of the non-stretchable layer 3 with the aforesaid rotational spreading machine, and air-dried for 30 minutes to prepare an adhesive layer (0.05 mm in thickness).
  • this adhesive layer On the surface of this adhesive layer, a rubber cement in which the same compound for the base layer as used in Example 3 was dissolved in 100 parts by weight of toluene, was coated in the same manner as described and air-dried for 12 hours.
  • the coated surface was wrapped up by tightly winding a cotton sheet (1000 mm in width) in the circumferential direction, and was vulcanized using the aforesaid vulcanizer at 140°C and 3kg/cm 2 for 90 minutes, and further, the vulcanized surface was polished by the aforesaid cylindrical grinding machine to prepare a second base layer (0.2 mm in thickness).
  • the adhesive layer 34 and the surface printing layer 4 were formed in the same manner as in Example 3, to prepare a printing blanket.
  • Table 5 shows the results together with those of Example 3.
  • Table 5 Entire tan ⁇ Ratio of change in peripheral length (%) Standard deviation in brilliance Permanent set in fatigue (mm) Ex. 31 0.28 0.04 17.2 0.04 Ex. 3 0.251 0.06 17.3 0.05

Landscapes

  • Printing Plates And Materials Therefor (AREA)
EP96102285A 1995-02-16 1996-02-15 Blanchet d'impression Expired - Lifetime EP0727326B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP28312/95 1995-02-16
JP7028312A JP2832157B2 (ja) 1995-02-16 1995-02-16 印刷用ブランケット

Publications (3)

Publication Number Publication Date
EP0727326A1 true EP0727326A1 (fr) 1996-08-21
EP0727326B1 EP0727326B1 (fr) 1998-04-29
EP0727326B2 EP0727326B2 (fr) 2006-03-08

Family

ID=12245108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96102285A Expired - Lifetime EP0727326B2 (fr) 1995-02-16 1996-02-15 Blanchet d'impression

Country Status (4)

Country Link
EP (1) EP0727326B2 (fr)
JP (1) JP2832157B2 (fr)
CA (1) CA2169430C (fr)
DE (1) DE69600260T3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5860360A (en) * 1996-12-04 1999-01-19 Day International, Inc. Replaceable printing sleeve
WO1999036270A1 (fr) * 1998-01-15 1999-07-22 Day International, Inc. Manchon remplaçable
EP1110748A1 (fr) * 1999-12-21 2001-06-27 Heidelberger Druckmaschinen Aktiengesellschaft Blanchet d'impression comprenant une couche de renforcement isotropique
WO2002024464A1 (fr) * 2000-09-19 2002-03-28 Akl Flexo Technik Gmbh Ensemble manchon pour un cylindre d'impression
USRE38468E1 (en) 1996-12-04 2004-03-23 Day International, Inc. Replaceable sleeve

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2938403B2 (ja) * 1996-12-13 1999-08-23 住友ゴム工業株式会社 印刷用ブランケット
JP2000118164A (ja) 1998-10-14 2000-04-25 Kinyosha Co Ltd オフセット印刷用ブランケット及びその製造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3418864A (en) * 1963-05-16 1968-12-31 Grace W R & Co Printing blanket and method of making the same
FR2096469A1 (fr) * 1970-06-24 1972-02-18 Grace W R Ltd
US4812357A (en) * 1988-09-23 1989-03-14 W. R. Grace & Co.-Conn. Printing blanket
EP0514344A1 (fr) * 1991-05-14 1992-11-19 Heidelberg Harris Inc. Blanchet d'impression tubulaire sans fente

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Publication number Priority date Publication date Assignee Title
US3700541A (en) † 1970-04-11 1972-10-24 Dunlop Holdings Ltd Printers' blankets
ES2048915T5 (es) † 1989-10-05 1999-11-01 Heidelberger Druckmasch Ag Maquina de impresion offset.
FR2660895B1 (fr) † 1990-04-12 1994-10-28 Rollin Sa Cylindre revetu d'un blanchet d'impression.
US5066537A (en) * 1990-10-04 1991-11-19 W. R. Grace & Co.-Conn. Printing blanket containing a high elongation fabric
DE4230431C2 (de) † 1992-09-11 1996-09-26 Roland Man Druckmasch Offset-Gummituchhülse
JP2747198B2 (ja) * 1993-06-07 1998-05-06 住友ゴム工業株式会社 印刷用オフセットブランケット

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3418864A (en) * 1963-05-16 1968-12-31 Grace W R & Co Printing blanket and method of making the same
FR2096469A1 (fr) * 1970-06-24 1972-02-18 Grace W R Ltd
US4812357A (en) * 1988-09-23 1989-03-14 W. R. Grace & Co.-Conn. Printing blanket
US4812357B1 (fr) * 1988-09-23 1990-03-27 Grace W R & Co
EP0514344A1 (fr) * 1991-05-14 1992-11-19 Heidelberg Harris Inc. Blanchet d'impression tubulaire sans fente

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5860360A (en) * 1996-12-04 1999-01-19 Day International, Inc. Replaceable printing sleeve
US5983799A (en) * 1996-12-04 1999-11-16 Day International, Inc. Replaceable sleeve
USRE38468E1 (en) 1996-12-04 2004-03-23 Day International, Inc. Replaceable sleeve
WO1999036270A1 (fr) * 1998-01-15 1999-07-22 Day International, Inc. Manchon remplaçable
EP1110748A1 (fr) * 1999-12-21 2001-06-27 Heidelberger Druckmaschinen Aktiengesellschaft Blanchet d'impression comprenant une couche de renforcement isotropique
US6389965B1 (en) 1999-12-21 2002-05-21 Heidelberger Druckmaschinen Ag Tubular printing blanket with tubular isotropic reinforcing layer
WO2002024464A1 (fr) * 2000-09-19 2002-03-28 Akl Flexo Technik Gmbh Ensemble manchon pour un cylindre d'impression
DE20122925U1 (de) 2000-09-19 2010-04-29 Akl Flexo Technik Gmbh Hülsenanordnung für einen Druckzylinder

Also Published As

Publication number Publication date
JP2832157B2 (ja) 1998-12-02
DE69600260T3 (de) 2006-08-03
CA2169430C (fr) 2003-04-01
CA2169430A1 (fr) 1996-08-17
DE69600260T2 (de) 1998-12-10
EP0727326B1 (fr) 1998-04-29
DE69600260D1 (de) 1998-06-04
EP0727326B2 (fr) 2006-03-08
JPH08216548A (ja) 1996-08-27

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