WO2003095220A1 - Systeme continu de conditionnement et procede d'utilisation associe - Google Patents

Systeme continu de conditionnement et procede d'utilisation associe Download PDF

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Publication number
WO2003095220A1
WO2003095220A1 PCT/US2002/014349 US0214349W WO03095220A1 WO 2003095220 A1 WO2003095220 A1 WO 2003095220A1 US 0214349 W US0214349 W US 0214349W WO 03095220 A1 WO03095220 A1 WO 03095220A1
Authority
WO
WIPO (PCT)
Prior art keywords
cloth
conditioning
component
belt
cleaning
Prior art date
Application number
PCT/US2002/014349
Other languages
English (en)
Inventor
Avi-Ben Porat
Original Assignee
Baldwin Graphic Systems, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Baldwin Graphic Systems, Inc. filed Critical Baldwin Graphic Systems, Inc.
Priority to AU2002303656A priority Critical patent/AU2002303656A1/en
Priority to PCT/US2002/014349 priority patent/WO2003095220A1/fr
Publication of WO2003095220A1 publication Critical patent/WO2003095220A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/007—Use of printing belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/20—Wiping devices
    • B41P2235/24—Wiping devices using rolls of cleaning cloth

Definitions

  • the present invention generally relates to a continuous cleaning system for use in printing operations, and more particularly to a device for continuously conditioning a printing belt or printing cylinder by treating any ink or debris that accumulates on the printing belt so that the ink or debris can not be transferred.
  • the printing belt should be completely dry before printing is resumed. Complete drying of the printing belt is particularly important when the cleanup liquid is solvent, since solvent left on the printing belt will contaminate the paper and cause excessive waste when printing resumes. Similarly, excess water left on the printing belt following wash-up can disturb the ink-water balance and result in additional paper waste. [0007] A very thin film of dry ink build-up on the printing belt does not have a substantial negative effect on print quality, as a subsequent wet image can be transferred over the dry ink. As additional ink and debris accumulate, however, the layer of dry ink may scale off the belt and degrade print quality, or adhere to the belt and make removal difficult.
  • the cloths or other articles used to remove the wet ink and debris from the printing belt should be clean and dry. Excessive build-up of ink or debris on the cloth used to condition the printing belt will not effectively dry the printing belt, resulting in a deterioration of print quality.
  • a conditioning device is provided to continuously remove and/or significantly reducing transferability of excessive or wet ink that accumulates on a printing belt or cylinder.
  • the conditioning system includes a constantly revolving conditioning cloth that is in continuous engagement with the printing belt or cylinder.
  • the device is designed to improve print quality by removing and/or significantly reducing transferability of residue or shadows from previous impressions on the printing belt.
  • the conditioning system also includes a dryer, for example, an infrared drying device, for drying the conditioning cloth before the cloth engages the printing belt. The dryer assures that the conditioning cloth can effectively absorbs excess or wet ink existing on the printing belt or cylinder.
  • the continuous conditioning system may further include a belt-cleaning device.
  • the belt-cleaning device includes a cleaning cloth that periodically contacts the printing belt or cylinder to clean and scrub the printing belt, or cylinder, after each run, or at the end of each day.
  • the belt cleaning system includes a wetting mechanism which pre-soaks the cleaning cloth with solvent, or other cleaning liquids, before it contacts the printing belt or cylinder.
  • a cloth cleaning system for the conditioning cloth and a cloth cleaning system for the cleaning cloth of the periodic cleaning device can also be configured using alternative or additional conditioning, drying, and cleaning means.
  • Figure 1 is a perspective view of a continuous conditioning system in accordance with the present invention.
  • Figure 2 is a perspective view of a continuous conditioning system in accordance with the present invention.
  • Figure 3 is a perspective view of a continuous conditioning system in accordance with the present invention.
  • Figure 4 is a perspective view of a continuous conditioning system in accordance with the present invention.
  • a continuous conditioning system for a printing belt or cylinder in a printing press generally identified by the numeral 2 includes a conditioning device 20 and a cleaning device 60.
  • the continuous conditioning system is designed to improve print quality by removing and/or significantly reducing transferability of excessive or wet ink, debris, residue or shadows from previous impressions that accumulate on a printing belt or cylinder.
  • Figure 1 illustrates a continuous conditioning device 20 and a cleaning device 60 that are positioned adjacent to a printing belt 10.
  • the conditioning device includes a conditioning cloth which is in the form of a belt 22.
  • the conditioning media can be cloth if the cloth dispensing unit is used or cloth/porous-media in a form of belt. Illustrated in Fig. 1, is a belt and not a cloth.
  • the belt may be made of a non- woven cloth and utilized as a cloth.
  • the conditioning media may be in the form of a porous synthetic material which can absorb contaminants and liquid.
  • the conditioning device further includes a drying device 26, and a conditioning cleaning device 27.
  • the cleaning device comprises a cleaning cloth 52, a means for cleaning the printing belt 50, and a cleaning cloth cleaning device 30.
  • the conditioning belt or cloth 22 is in continuous contact with the printing belt 10 and constantly revolves about rollers 24, powered by conventional rotating means, such as an electric motor.
  • This conditioning cloth absorbs wet ink and provides a mechanical loosening function by dislodging and facilitating the removal of accumulated dry ink or debris, which stick to the printing belt.
  • the conditioning device 20 in the present embodiment also includes a device to dry the conditioning cloth 26.
  • the drying device is an infrared drying device.
  • the conditioning device 20 also includes a conditioning cloth cleaning device 27 as shown in Fig. 1.
  • the cloth cleaning device includes a wetting mechanism 32, a spray mechanism 34, and a recovery system 40. After the conditioning cloth 22 engages the printing belt, and absorbs the excess or wet ink, the conditioning cloth cleaning system cleans the cloth.
  • the wetting mechanism 32 dispenses detergent, or some other liquid or solid cleaner, from a detergent supply tank 36. This dilutes the ink or dissolves other debris on the conditioning cloth.
  • the wetting mechanism is a wetting roller 33 held in contact with the cloth and partially submerged in a detergent bath to transfer detergent onto the conditioning cloth.
  • the wetting roller 33 rotates, causing the conditioning cloth to become saturated with detergent.
  • the wetting mechanism is a means for spraying solvent, such as a spray bar, directly onto the conditioning cloth.
  • a previously saturated cleaning cloth contacting the conditioning cloth can be used for purposes of the wetting mechanism.
  • the spray mechanism 34 includes a power spray device for pushing detergent, or other liquid, through the conditioning cloth to loosen debris. Depending on the implementation, the spray mechanism 34 directs a stream of air through the conditioning cloth.
  • the construction and operation of a spray bar dispensing fluid can be of any form known to those skilled in the art.
  • the recovery system 40 consists essentially of a vacuum generation means 41, a vacuum head 42, conduit means 44, and a recovery tank 46.
  • the vacuum generation means is attached to the vacuum head by the conduit means.
  • the vacuum head is a substantially "U" shaped housing extending along the width of the conditioning cloth 22. Flexible wipers are positioned at the ends of the sides of the housing and thus contact the conditioning cloth to seal the surfaces and loosen debris on the cloth. It is understood by those skilled in the art that such sealing means do not have to be in contact with the conditioning cloth to provide suction; for example, another embodiment uses a labyrinth surface.
  • conditioning cloth 22 may be cleaning cloth
  • the cloth should be porous in order to be absorbent to ink and solvent.
  • the cloth should have sufficient abrasive resistance so as not to shed lint or other foreign particles, and should have sufficient mechanical tension strength to avoid breakage.
  • the diluted ink, dissolved debris, and detergent are drawn into the vacuum head by the vacuum generating means and travel through the conduit means into the recovery tank.
  • the spray mechanism 34 facilitates this vacuuming by loosening debris prior to suction.
  • the spray mechanism receives solvent from the recovery tank (or supply tank 36) by means of a conduit.
  • the used solvent from the spray mechanism is captured by the recovery system into the recovery tank. Since the mixture of detergent, ink, and debris is diluted, it can be reused to clean the conditioning cloth a number of times. To extend the life of the detergent, the mixture may be filtered. Once the mixture in the recovery tank is too contaminated to use, the detergent is replaced. The recovery system reduces the environmental impact of the conditioning process.
  • Periodic cleaning of the printing belt is beneficial to print quality.
  • the printing belt cleaning device 50 of this embodiment can be engaged as desired to wash the printing belt 10 in a thorough and complete manner not called for in the conditioning device 20.
  • the belt cleaning device 60 uses a cleaning cloth 52 of the type used as a conditioning cloth specified previously.
  • the cleaning cloth cleaning device 30 used is identical in function and description as the aforementioned conditioning device 20. Both of these devices are connected by conduit means 44 to the vacuum means 41 evacuating to the recovery tank 46. Both of these devices function such that cloth cleaning occurs following cloth contact with the printing belt.
  • the printing belt cleaning device includes means to clean the belt 50. This means, in the present embodiment, is similar in function and composition as the cloth cleaning devices 27, 30.
  • the belt-cleaning device includes wetting mechamsm 56 that saturates the cleaning cloth before it is exposed to the printing belt. The saturated cloth then passes over the belt so that mechanical contact can substantially loosen and dislodge accumulated dry ink and debris.
  • the wetting mechanism in this embodiment is a wetting roller of the type described above, but the use of other wetting means is understood from this disclosure.
  • the roller 54 of the cleaning cloth serve both to move the cleaning cloth into engagement with the printing belt and to cause the rotation of the cleaning cloth.
  • the cleaning device is retractable and moved into engagement as needed. It is understood that the same detergent supply may be used by both of the cloth cleaning means, as well as by the wetting means for the belt-cleaning device.
  • the conditioning device 20 and the belt cleaning device 60 should have containment or back-up rollers 15, or the like, on an opposite surface 12 of the printing belt 10. Although, this feature is not necessary for the invention to fully operate. These back-up rollers support the belt at points of contact to prevent the belt from "fluttering" during the continuous contact of the conditioning device and the periodic contact of the cleaning device. This reduces fatigue and increases the useful life of the printing belt.
  • the continuous cleaning system 60 for the printing belt 10 may also include a dryer, such as an air knife, positioned adjacent to the printing belt, after the conditioning device with respect to the direction of belt rotation.
  • the drying means is to remove any residual moisture not removed during the conditioning procedure.
  • Figure 2 illustrates a conditioning system in the form of cloth dispensing unit and in which the cloths used to clean and condition the printing belt 10 are wound on rolls.
  • the cloth was in the form of a belt.
  • a continuous conditioning device 70 and a cleaning device 80 are positioned adjacent to a printing belt 10.
  • the conditioning device is composed of a conditioning cloth supply roll 74, a conditioning cloth 72, a conditioning cloth take-up roll 76, a means for advancing the conditioning cloth 78, and a cloth engaging device which is in a form of inflatable bladder or a mechanism that moves the system to contact the printing belt (Trade name IMPACT®) 79 for engaging the cloth to the printing belt.
  • the conditioning cloth is mounted on the conditioning cloth supply roll 74 such that it passes between the IMPACT® 79 and the printing belt 10, and is attached to the take-up roll.
  • the means for advancing the cloth 78 is mounted in such a way as to actuate the rotation of the take-up roll.
  • the fabric, properties, and construction of the conditioning cloth 72 are identical to the conditioning belt for the conditioning device in Figure 1.
  • the cloth should provide lint resistance.
  • a suitable cleaning cloth is that sold by Baldwin under the trade name Printmaster®, made by DuPont, which is a nonwoven polyester composition spunlaced fabric.
  • the nonwoven fabric is formed by a hydroentangling process in which staple fibers are entangled through "hydraulic needling" to form a strong, fabric-like structure.
  • FIG. 2 Also shown in Figure 2 is an example of the IMPACT® 79, which in this illustration is an inflatable bladder. By pneumatically inflating or expanding the bladder in some other way, the surface of the bladder contacting the conditioning cloth 72 will move the conditioning cloth 72 into engagement with the surface of the printing belt 10 to thereby dry the same.
  • an inflatable bladder By pneumatically inflating or expanding the bladder in some other way, the surface of the bladder contacting the conditioning cloth 72 will move the conditioning cloth 72 into engagement with the surface of the printing belt 10 to thereby dry the same.
  • an inflatable bladder provides a relatively wide and uniform stripe along the printing belt 10 which substantially eliminates the presence of streaks on the belt after conditioning. Furthermore, the bladder is not easily contaminated with ink and is cleaned much easier than a brush, or the like, having bristles.
  • the use of a flexible bladder also provides a mechanical cleaning means or scrubbing means to loosen debris on the printing belt while cleaning the printing belt.
  • the conditioning cloth advancing means 78 includes a solenoid activated by a control mechanism that, in turn, activates a lever which turns the take-up roll 76. More information describing this advancing means are set forth in United States Patent No. 5,176,080 issued January 5, 1993 for a Cloth Supply System For Blanket Cylinder For Use in Printing Presses, which is incorporated herein by reference. [0044] Depending on the implementation, the advancing means 78 is a motorized oneway clutch mechamsm. Further information about the construction and operation of a suitable one-way clutch mechanism is set forth in United States Patent No. 4,344,361, issued August 17, 1982, to Macphee et al., and its continuation, United States Patent No.
  • the take-up roll in this example, is wound to accept used conditioning cloth as needed.
  • the conditioning cloth 72 advances in discrete intervals during press operation.
  • the IMPACT® 78 holds a portion of the cloth in engagement with the printing belt until the engaged portion of the cloth is no longer able to remove wet ink, at which point the IMPACT® retracts, the cloth advances to provide a clean surface to contact the belt, and the IMPACT® moves back into engagement.
  • the IMPACT® is held in contact with the belt while advancing the conditioning cloth.
  • the embodiment illustrated in Figure 2 also include a belt cleaning device 80 similarly constructed to the conditioning device 70 as described above.
  • the belt cleaning device 80 includes a cleaning cloth 82, a cleaning cloth supply roll 84, a cleaning cloth take-up roll 86, means for advancing 88 the cleaning cloth onto the take-up roll 86, and an IMPACT® 89, means for moving the cleaning cloth into engagement with the printing belt.
  • the fabric, construction, and properties of the cleaning cloth 82 are similar to the conditioning cloth 72 for the conditioning device 70 described earlier in this embodiment.
  • the cleaning cloth is treated with a solvent prior to installation on the press. This solvent treatment may be performed prior to purchase of the supply roll, or on the site of the press.
  • the cloth may be treated in the cleaning device 80.
  • Cleaning cloth supply roll 84 provides the cleaning cloth 82 to the cleaning cloth take-up roll 86.
  • the belt-cleaning device 80 may also include means for advancing 88 the cleaning cloth 82 onto the take-up roll 86.
  • the means for advancing 88 the cleaning cloth 82 onto the take-up roll 86 is preferably a solenoid activated by a control mechamsm that, in turn, activates a lever which turns the take-up roll 86 as previously described.
  • means 88 may also include a motorized one-way clutch mechamsm, a step motor, a rivet and pawl mechanism, or other motor and the like.
  • the cleaning cloth 82 cleanses the printing belt 10 of ink and debris when engaged by the IMPACT®.
  • the advancing means 88 is activated to advance the cleaning cloth onto the take-up roll 86 to provide a clean portion of the cleaning cloth to contact the printing belt 10.
  • the belt cleaning device 80 also includes means for moving 89 the cleaning cloth
  • the means for moving 89 the cleaning cloth 82 into engagement with the printing belt 10 is preferably an inflatable bladder as described above with the conditioning device 70, although in alternate embodiments it is a pivotable blade or moveable roller.
  • a power wash system 90 may be included in the continuous conditioning system.
  • the power wash system 90 dispenses solvent from a solvent dispensing tank 91 by conduit means 92 directly onto the printing belt 10. Operation is effected by fluid control devices 93 that direct solvent, water, or other cleaning liquids or solids, or air to spray in specific quantities and at specific pressures.
  • the power wash system 90 includes a recovery system 94, similar to the recovery system used in the cloth cleaning system described above, having a containment mechamsm and vacuuming means to prevent the solvent from leaking into the other areas of the printing press, thereby avoiding mechanical or other damage.
  • FIG. 4 Adverting to Figure 4, shown is a belt-cleaning device of the continuous conditioning and periodic cleaning system of a printing belt 10.
  • the periodic belt-cleaning device 95 in Figure 4 includes a wet/dry cleaning mechanism 96.
  • the wet/dry mechanism 96 supplies cleaning solvent or other cleaning liquids or solids directly onto the belt 10 during the periodic washing operation.
  • the wet/dry mechanism 96 includes a casing 97 housing two rollers 98, 99.
  • the housing is movable, by conventional means such as a motor, to bring the rollers 98, 99 into contact with the printing belt 10.
  • the first roller 98 wets or soaks the printing belt 10 with solvent or other cleaning liquid.
  • the roller 98 is partially submerged in a solvent reservoir to transfer the solvent from a solvent bath to the printing belt 10.
  • the second roller 99 is used as a scrubbing means to rub debris or other contaminates off the printing belt.
  • the second roller 99 can also be used to dry the printing belt but the cloth dispensing unit 70 shall be used to dry the printing belt.
  • the housing 97 for the wet/dry mechanism may contain a power wash system, as described above, and a drying means, as an adjacent infrared dryer or air knife to dry the printing belt in place of a drying roller.
  • a drying means as an adjacent infrared dryer or air knife to dry the printing belt in place of a drying roller.

Abstract

L'invention concerne un système continu de conditionnement (2) pour ceinture (10) ou cylindre d'impression dans une presse à imprimer comprenant un dispositif de conditionnement (20) et un dispositif de nettoyage (60). Le système continu de conditionnement (2) est conçu pour améliorer la qualité d'impression par élimination et/ou réduction importante du transfert d'excès d'encre ou d'encre humide, de débris, de résidus ou d'ombres laissés par des impressions précédentes qui s'accumulent sur une ceinture (10, 50) ou un cylindre d'impression. Le dispositif de conditionnement (2) comprend un tissu de conditionnement (22) sous la forme d'une bande amenée en engagement périodique avec la ceinture (10) ou le cylindre d'impression. Il (2) peut aussi comprendre un tissu de nettoyage (52) sous la forme d'une bande amenée en engagement périodique avec la ceinture (10) ou le cylindre d'impression. Le dispositif de conditionnement (2) et le dispositif de nettoyage (60) possèdent chacun un dispositif de rinçage/nettoyage de tissu destiné à nettoyer le tissu de conditionnement (22) sous forme de bande et le tissu de nettoyage (52) sous forme de bande, après leur contact avec la ceinture (10) ou le cylindre d'impression.
PCT/US2002/014349 2002-05-07 2002-05-07 Systeme continu de conditionnement et procede d'utilisation associe WO2003095220A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2002303656A AU2002303656A1 (en) 2002-05-07 2002-05-07 Continuous conditioning system for cleaning a printing press and method of using same
PCT/US2002/014349 WO2003095220A1 (fr) 2002-05-07 2002-05-07 Systeme continu de conditionnement et procede d'utilisation associe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2002/014349 WO2003095220A1 (fr) 2002-05-07 2002-05-07 Systeme continu de conditionnement et procede d'utilisation associe

Publications (1)

Publication Number Publication Date
WO2003095220A1 true WO2003095220A1 (fr) 2003-11-20

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PCT/US2002/014349 WO2003095220A1 (fr) 2002-05-07 2002-05-07 Systeme continu de conditionnement et procede d'utilisation associe

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AU (1) AU2002303656A1 (fr)
WO (1) WO2003095220A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103317843A (zh) * 2013-06-13 2013-09-25 浙江光普太阳能科技有限公司 丝网印刷机硅片清洁装置
CN104354462A (zh) * 2014-11-17 2015-02-18 绍兴县阳婷纺织品有限公司 高精密数码板导带式直接印花机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104475373A (zh) * 2014-11-28 2015-04-01 浙江鸿禧能源股份有限公司 一种丝网印刷及分检传送皮带擦洗方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3598488A (en) * 1969-03-13 1971-08-10 Eastman Kodak Co Cleaning web
US3776631A (en) * 1969-11-20 1973-12-04 Xerox Corp Liquid developer cleaning system
US3879785A (en) * 1973-04-27 1975-04-29 Xerox Corp Cleaning apparatus
US5572296A (en) * 1994-11-23 1996-11-05 Xerox Corporation Color printing system employing non-interactive development
US6016750A (en) * 1994-07-22 2000-01-25 Man Roland Druckmaschinen Ag Erasable printing plate and a process and apparatus for erasing and regenerating the printing plate
US20020100184A1 (en) * 2001-01-17 2002-08-01 Kai-Michael Gundel Conditioning device to change the moisture content of printing stock

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3598488A (en) * 1969-03-13 1971-08-10 Eastman Kodak Co Cleaning web
US3776631A (en) * 1969-11-20 1973-12-04 Xerox Corp Liquid developer cleaning system
US3879785A (en) * 1973-04-27 1975-04-29 Xerox Corp Cleaning apparatus
US6016750A (en) * 1994-07-22 2000-01-25 Man Roland Druckmaschinen Ag Erasable printing plate and a process and apparatus for erasing and regenerating the printing plate
US5572296A (en) * 1994-11-23 1996-11-05 Xerox Corporation Color printing system employing non-interactive development
US20020100184A1 (en) * 2001-01-17 2002-08-01 Kai-Michael Gundel Conditioning device to change the moisture content of printing stock

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103317843A (zh) * 2013-06-13 2013-09-25 浙江光普太阳能科技有限公司 丝网印刷机硅片清洁装置
CN104354462A (zh) * 2014-11-17 2015-02-18 绍兴县阳婷纺织品有限公司 高精密数码板导带式直接印花机

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